Table of Contents

 
 
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
____________________________________________________________________________________________________________________________
Form 10-K
(Mark One)
xANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
 For the fiscal year ended December 31, 20152018
OR
oTRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from          to
Commission File Number 1-13232 (Apartment Investment and Management Company)
Commission File Number 0-24497 (AIMCO Properties, L.P.)
 
Apartment Investment and Management Company
AIMCO Properties, L.P.
(Exact name of registrant as specified in its charter)
Maryland (Apartment Investment and Management Company) 84-1259577 
Delaware (AIMCO Properties, L.P.) 84-1275621 
(State or other jurisdiction of
incorporation or organization)
 
(I.R.S. Employer
Identification No.)
 
    
4582 South Ulster Street, Suite 1100   
Denver, Colorado 80237 
(Address of principal executive offices) (Zip Code) 
(303) 757-8101
(Registrant’s telephone number, including area code)
Securities registered pursuant to Section 12(b) of the Act:
 
Title of Each Class  Name of Each Exchange on Which Registered 
Class A Common Stock (Apartment Investment and Management Company) New York Stock Exchange 
Class A Cumulative Preferred Stock (Apartment Investment and Management Company) New York Stock Exchange 
Class Z Cumulative Preferred Stock (Apartment Investment and Management Company) New York Stock Exchange 
Securities registered pursuant to Section 12(b)12(g) of the Act:
  
None (Apartment Investment and Management Company)
Partnership Common Units (AIMCO Properties, L.P.)
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined by Rule 405 of the Securities Act.
 
Apartment Investment and Management Company: Yes x    No o
AIMCO Properties, L.P.: Yes x    No o
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.
 
Apartment Investment and Management Company: Yes o    No x
AIMCO Properties, L.P.: Yes o    No x
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.
 
Apartment Investment and Management Company: Yes x    No o
AIMCO Properties, L.P.: Yes x    No o
Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).
 
Apartment Investment and Management Company: Yes x    No o
AIMCO Properties, L.P.: Yes x    No o
Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.
 
Apartment Investment and Management Company: Yes x     No o
AIMCO Properties, L.P.: Yes x    No o



Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “non-accelerated filer”“smaller reporting company,” and “smaller reporting“emerging growth company” in Rule 12b-2 of the Exchange Act.
 
Apartment Investment and Management Company:
 Large accelerated filerx Accelerated filero
 Non-accelerated filero(Do not check if a smaller reporting company)Smaller reporting companyo
Emerging growth companyo
 
AIMCO Properties, L.P.:
 Large accelerated filero Accelerated filerx
 Non-accelerated filero(Do not check if a smaller reporting company)Smaller reporting companyo
Emerging growth companyo
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.
Apartment Investment and Management Company: o
AIMCO Properties, L.P.: o
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).
 
Apartment Investment and Management Company: Yes o    No x
AIMCO Properties, L.P.: Yes o    No x
The aggregate market value of the voting and non-voting common stock of Apartment Investment and Management Company held by non-affiliates of Apartment Investment and Management Company was approximately $5.7$6.6 billion as of June 30, 2015.2018. As of February 25, 2016,15, 2019, there were 156,599,775148,766,616 shares of Class A Common Stock outstanding.
As of February 25, 2016,15, 2019, there were 164,453,698 shares of158,495,487 Partnership Common Units outstanding.
_______________________________________________________
Documents Incorporated by Reference
Portions of Apartment Investment and Management Company’s definitive proxy statement to be issued in conjunction with Apartment Investment and Management Company’s annual meeting of stockholders to be held April 26, 2016,30, 2019, are incorporated by reference into Part III of this Annual Report.
 



EXPLANATORY NOTE
This filing combines the Annual Reports on Form 10-K for the fiscal year ended December 31, 2015,2018, of Apartment Investment and Management Company, or Aimco, and AIMCO Properties, L.P., or the Aimco Operating Partnership. Where it is important to distinguish between the two entities, we refer to them specifically. Otherwise, references to “we,” “us” or “our” mean collectively Aimco, the Aimco Operating Partnership and their consolidated entities.
Aimco, a Maryland corporation, is a self-administered and self-managed real estate investment trust, or REIT. Aimco, through wholly-owned subsidiaries, is the general and special limited partner of and, as of December 31, 2015,2018, owned a 95.2%94.3% ownership interest in the common partnership units of, the Aimco Operating Partnership. The remaining 4.8%5.7% interest is owned by limited partners. As the sole general partner of the Aimco Operating Partnership, Aimco has exclusive control of the Aimco Operating Partnership’s day-to-day management.
The Aimco Operating Partnership holds all of Aimco’s assets and manages the daily operations of Aimco’s business. Pursuant to the Aimco Operating Partnership agreement, Aimco is required to contribute to the Aimco Operating Partnership any assets, which it may acquire including all proceeds from the offerings of its securities. In exchange for the contribution of these assets, Aimco receives additional interests in the Aimco Operating Partnership with similar terms (e.g., if Aimco contributes proceeds of a stock offering, Aimco receives partnership units with terms substantially similar to the stock issued by Aimco).
We believe combining the periodic reports of Aimco and the Aimco Operating Partnership into this single report provides the following benefits:
We present our business as a whole, in the same manner our management views and operates the business;
We eliminate duplicative disclosure and provide a more streamlined and readable presentation sincebecause a substantial portion of the disclosures apply to both Aimco and the Aimco Operating Partnership; and
We save time and cost through the preparation of a single combined report rather than two separate reports.
We operate Aimco and the Aimco Operating Partnership as one enterprise, the management of Aimco directs the management and operations of the Aimco Operating Partnership, and the members of the Board of Directors of Aimco are identical to those of the Aimco Operating Partnership.Partnership’s general partner.
We believe it is important to understand the few differences between Aimco and the Aimco Operating Partnership in the context of how Aimco and the Aimco Operating Partnership operate as a consolidated company. Aimco has no assets or liabilities other than its investment in the Aimco Operating Partnership. Also, Aimco is a corporation that issues publicly traded equity from time to time, whereas the Aimco Operating Partnership is a partnership that has no publicly traded equity. Except for the net proceeds from stock offerings by Aimco, which are contributed to the Aimco Operating Partnership in exchange for additional limited partnership interests (of a similar type and in an amount equal to the shares of stock sold in the offering), the Aimco Operating Partnership generates all remaining capital required by its business. These sources include the Aimco Operating Partnership’s working capital, net cash provided by operating activities, borrowings under its revolving credit facility, the issuance of debt and equity securities, including additional partnership units, and proceeds received from the sale of apartment communities.
Equity, partners’ capital and noncontrolling interests are the main areas of difference between the consolidated financial statements of Aimco and those of the Aimco Operating Partnership. Interests in the Aimco Operating Partnership held by entities other than Aimco, which we refer to as OP Units, are classified within partners’ capital in the Aimco Operating Partnership’s financial statements and as noncontrolling interests in Aimco’s financial statements.
To help investors understand the differences between Aimco and the Aimco Operating Partnership, this report provides separate consolidated financial statements for Aimco and the Aimco Operating Partnership; a single set of consolidated notes to such financial statements that includes separate discussions of each entity's stockholders'entity’s stockholders’ equity or partners'partners’ capital, as applicable; and a combined Management’s Discussion and Analysis of Financial Condition and Results of Operations section that includes discrete information related to each entity.
This report also includes separate Part II, Item 9A. Controls and Procedures sections and separate Exhibits 31 and 32 certifications for Aimco and the Aimco Operating Partnership in order to establish that the requisite certifications have been made and that Aimco and the Aimco Operating Partnership are both compliant with Rule 13a-15 or Rule 15d-15 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and 18 U.S.C. §1350.





APARTMENT INVESTMENT AND MANAGEMENT COMPANY
AIMCO PROPERTIES, L.P.
TABLE OF CONTENTS
ANNUAL REPORT ON FORM 10-K
For the Fiscal Year Ended December 31, 20152018
  
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FORWARD-LOOKING STATEMENTS
The Private Securities Litigation Reform Act of 1995 provides a “safe harbor” for forward-looking statements in certain circumstances. Certain information included in this Annual Report contains or may contain information that is forward-looking, within the meaning of the Federalfederal securities laws, including, without limitation, statements regarding: our ability to maintain current or meet projected occupancy;occupancy, rental ratesrate and property operating results; the effect of acquisitions, dispositions, developmentsredevelopments and redevelopments;developments; our ability to meet budgeted costs and timelines, and achieve budgeted rental rates related to our developmentredevelopment and redevelopmentdevelopment investments; expectations regarding sales of our apartment communities and the use of proceeds thereof; and our ability to comply with debt covenants, including financial coverage ratios.
Actual results may differ materially from those described in these forward-looking statements and, in addition, will be affected by a variety of risks and factors, some of which are beyond our control, including, without limitation: real
Real estate and operating risks, including fluctuations in real estate values and the general economic climate in the markets in which we operate and competition for residents in such markets; national and local economic conditions, including the pace of job growth and the level of unemployment; the amount, location and quality of competitive new housing supply; financingthe timing of acquisitions, dispositions, redevelopments and developments; and changes in operating costs, including energy costs;
Financing risks, including the availability and cost of capital markets financing andmarkets’ financing; the risk that our cash flows from operations may be insufficient to meet required payments of principal and interest; and the risk that our earnings may not be sufficient to maintain compliance with debt covenants;
Insurance risks, including the cost of insurance, natural disasters and severe weather such as hurricanes; and
Legal and regulatory risks, including costs associated with prosecuting or defending claims and any adverse outcomes; the terms of governmental regulations that affect us and interpretations of those regulations; the competitive environment in which we operate; the timing of acquisitions, dispositions, redevelopments and developments; insurance risk, including the cost of insurance; natural disasters and severe weather such as hurricanes; litigation, including costs associated with prosecuting or defending claims and any adverse outcomes; energy costs; and possible environmental liabilities, including costs, fines or penalties that may be incurred due to necessary remediation of contamination of apartment communities presently or previously owned by us.
In addition, our current and continuing qualification as a real estate investment trust involves the application of highly technical and complex provisions of the Internal Revenue Code and depends on our ability to meet the various requirements imposed by the Internal Revenue Code, through actual operating results, distribution levels and diversity of stock ownership.
Readers should carefully review our financial statements and the notes thereto, as well as the section entitled “Risk Factors” described in Item 1A of this Annual Report and the other documents we file from time to time with the Securities and Exchange Commission.
As used herein and except as the context otherwise requires, “we,” “our” and “us” refer to Apartment Investment and Management Company (which we refer to as Aimco), AIMCO Properties, L.P. (which we refer to as the Aimco Operating Partnership) and their consolidated entities, collectively.
Certain financial and operating measures found herein and used by management are not defined under accounting principles generally accepted in the United States, or GAAP. These measures are defined and reconciled to the most comparable GAAP measures under the Non-GAAP Measures heading and include: Funds From Operations, Pro forma Funds From Operations, Adjusted Funds From Operations, Free Cash Flow, Net Asset Value, Economic Income, and the measures used to compute our leverage ratios.
PART I

Item 1. Business
The Company
Apartment Investment and Management Company, or Aimco, is a Maryland corporation incorporated on January 10, 1994. Aimco is a self-administered and self-managed real estate investment trust, or REIT. AIMCO Properties, L.P., or the Aimco Operating Partnership, is a Delaware limited partnership formed on May 16, 1994, to conduct our business, which isREIT, focused on the ownership, management, redevelopment and limited development of quality apartment communities located in some of the largest coastal and job growth markets ofin the United States.

Aimco, through its wholly-owned subsidiaries, AIMCO-GP, Inc. and AIMCO-LP Trust, owns a majority of the ownership interests in AIMCO Properties, L.P., or the Aimco Operating Partnership.Partnership, a Delaware limited partnership formed on May 16, 1994. Aimco conducts all of its business and owns all of its assets through the Aimco Operating Partnership. Interests in the Aimco Operating Partnership that are held by limited partners other than Aimco are referred to as “OP Units.” OP Units include common partnership units, high performance partnership units and partnership preferred units, which we refer to as common OP Units, HPUs and preferred OP Units, respectively. We also refer to HPUs as common partnership unit equivalents. At December 31, 2015, after eliminations for units held by consolidated entities, the Aimco Operating Partnership had 164,179,533 common partnership units and equivalents outstanding. At December 31, 2015, Aimco owned 156,326,416 of the common partnership units (95.2% of the outstanding common partnership units and equivalents of the Aimco Operating Partnership) and Aimco had outstanding an equal number of shares of its Class A Common Stock, which we refer to as Common Stock.
As of December 31, 2015, our real estate portfolio consisted of 196 apartment communities with 49,149 apartment homes.

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Business Overview
Our business activities are defined by a commitment to our core values of integrity, respect, collaboration, performance and a focus on our customers. These values and our corporate mission, “to consistently provide quality apartment homes in a respectful environment delivered by a team of people who care,” shape our culture. In all of our interactions with residents, team members, business partners, lenders, and equity holders, we aim to be the best owner and operator of apartment communities and an outstanding corporate citizen.
Our principal financial objective is to provide predictable and attractive returns to our equity holders, as measured by growth inholders. We measure our long- term total return using Economic Income, defined as Net Asset Value, or NAV, growth plus dividends. NAV is used by many investors because the value of company assets can be readily estimated, even for non-earning assets such as land or properties under development. NAV has the advantage of incorporating the investment decisions of thousands of real estate investors, enhancing comparability among companies that have differences in their accounting, and avoiding disparity that can result from application of GAAP to investment properties and various ownership structures. Some investors focus on multiples of Adjusted Funds From Operations, (each defined underor AFFO, and Funds From Operations, FFO. Our disclosure of AFFO, a measure of current return, complements our focus on Economic Income. We also use Pro forma Funds From Operations, or Pro forma FFO, as a secondary measure of operational performance. Over the Non-GAAP Performance and Liquidity Measures heading in Item 7)past five years, we have generated Economic Income at a compounded annual return of 11.5%. Our business plan to achieve this principal financial objective is to:
operate our portfolio of desirable apartment homes with valued amenities, with a high level of focus on customer selection and customer satisfaction and in an efficient manner that realizes the benefits of our corporate systemsproduces predictable and local management expertise;growing Free Cash Flow;
improve our geographically diversified portfolio of apartment communities, which average “B/B+” in quality (defined under the Portfolio Management heading below)is diversified both by geography and price point by selling lower rated apartment communities with lower projected Free Cash Flow internal rates of return and investing the proceeds from such sales through property upgrades,capital enhancements, redevelopment, limited development, and acquisitionacquisitions with greater land value, higher expected rent growth, and projected Free Cash Flow internal rates of higher-quality apartment communities;return in excess of those expected from the communities sold;
provideuse low levels of financial leverage primarily byin the useform of non-recourse, long-dated, fixed-rate property debt and perpetual preferred equity, a combination whichthat reduces our refunding and re-pricing risk and which provides a hedge against increases in interest rates; and
emphasizefocus intentionally on a collaborative respectful, and performance-orientedproductive culture while maintaining high moralebased on respect for others and team engagement.personal responsibility.
Our long-standing business is organized around our strategicfive areas of strategic focus: excellence in property operations; adding value through redevelopment and limited development; upgrading our portfolio through disciplinedoperational excellence; redevelopment; portfolio management; maintaining a safe and liquid balance sheet; and fostering a performanceteam and culture. Our strategic areas of strategic focus are described in more detail below. Recent accomplishments in the execution of such strategies are discussed in the Executive Overview in Item 7.
Property OperationsOperational Excellence
We own and operate a diversified portfolio of conventionalmarket rate apartment communities. We also operate acommunities, diversified by both geography and price point, which we refer to as our Real Estate portfolio. At December 31, 2018, our Real Estate portfolio included 134 apartment communities with 36,549 apartment homes in which we held an average ownership of approximately 99%. This portfolio was divided about two thirds by value to our “Same Store” portfolio of affordable apartment communities, which consists of apartments with rents that are generally paid, in whole or part, by a government agency. As the tax credit delivery or compliance periods for our affordable apartment communities expire, between 2016 and 2023, we expect to sell thesestabilized apartment communities and reinvest the proceeds in our conventional portfolio. Our conventionalabout one third by value to “Other Real Estate,” which includes recently acquired communities and affordable portfolios comprise our reportable segments.communities under redevelopment or development whose long-term financial contribution is not yet stabilized.
Our property operations are organized into two geographic areas, the East and West. To manage our portfolio moreproperty operations efficiently and to increase the benefits from our local management expertise, we give direct responsibility for operations within each area to area operations leaders with regular oversight by senior management reviews.management. To enable the area operations leaders to focus on sales and service, as well as to improve financial control and budgeting, we have dedicated area financial officers who support the operations leaders. Additionally, with the exception of routine maintenance and purchases and installation of equipment, and other capital assets, we have specialized teams that manage capital spending related to larger capital and construction projects, thus reducing the need for the area operations leaders to spend time on oversight of such projects.more complicated construction.
We seek to improve our property operations by: employing service-oriented, well-trained employees; upgrading systems;team members; taking advantage of advances in technology; centralizing operational tasks where efficient to do so; standardizing business processes, operational measurements, and internal reporting; and enhancing financial controls over field operations. We focus on the following areas:

Customer Satisfaction. Our operating culture is focused on our residents and we regularly monitor and evaluate our performance through a customer satisfaction tracking system. Our goal is to provide our residentsproviding them with a high level of service in a clean, safe, and attractive communities.respectful living environment. We regularly monitor and evaluate our performance by providing customers with numerous opportunities to grade our work. In 2018, we received 78,000 customer grades averaging 4.25 on a five-point scale. We use this customer feedback as a daily management tool. We also publish on-line these customer evaluations as important and credible information for prospective customers. We have automated certain aspects of our on-site operations to enable our current and future residents to interact with us using methods that are efficient and effective for them, such as making on-line requests for service work taking self-guided apartment community tours and executing leases and lease renewals on-line. In addition, we emphasize the quality of our on-site employeesteam members through recruiting, training and retention programs, which, we believewith continuous and real-time customer feedback, contributes to improved customer serviceservice. We believe that greater customer satisfaction leads to higher resident retention and increased occupancy rates, which in turn leads to increased occupancy ratesrevenue and enhanced operational performance.reduced costs.

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Resident Selection and Retention. In our apartment communities, we believe that one’s neighbors are a meaningful part of the value provided,customer experience, together with the location of the community and the physical quality of the apartment homes. Part of our property operations strategy is to focus on attracting and retaining stable, credit-worthy residents who are also good neighbors. We have structured goalsexplicit criteria for resident selection, which we apply to new and coaching for allrenewal leases, including creditworthiness and behavior in accordance with our community standards and our written “Good Neighbor Commitment.” Our focus on resident selection and retention led to 54% of our sales personnel, a tracking system for inquiries and a standardized renewal communication program. Weexpiring leases being renewed in 2018, the highest result we have standardized residential financial stability requirements and have policies and monitoring practices to maintain our resident quality.yet achieved.
Revenue Management and Ancillary Services. For our conventional apartment communities, weWe have a centralized revenue management system that leverages people, processes and technology to work in partnership with our area operationallocal property management teams to develop rental rate pricing. We seek to increase revenue,Free Cash Flow, which we define as net operating income and free cash flowless Capital Replacements, by optimizing the balance between rental and occupancy rates, as well as taking into consideration the cost ofcosts such as preparing an apartment home for a new resident. We are also focused on careful measurements of on-site operations, as we believe that timely and accurate collection of apartment community performance and resident profile data will enableallows us to maximize revenueFree Cash Flow through better property management and leasing decisions. We seek to maximize rental revenue withprofit by performing timely data and analysis of new and renewal pricing for each apartment home, thereby enabling us to respondadjust rents quickly in response to changes in supply and demand.demand and minimize vacancy time. We also generate incremental revenue by providing or facilitating the provision of services to our residents, including, at certain apartment communities, telecommunications services, appliance rental, carport, premier parking garageoptions, package lockers and storage space rental.
Controlling Expenses. Cost controls are accomplished by localInnovation is the foundation of our cost control efforts. Innovative activities we have undertaken include: moving administrative tasks to our shared service center, which reduces costs and allows site teams to focus at the area level;on sales and service; taking advantage of economies of scale at the corporate level; andlevel, through electronic procurement. Referprocurement which reduces complexity and increases purchasing volume discounts; focusing on life cycle costs by investing in more durable, longer-lived materials, which reduce turn times and costs; and leveraging technology to enhance the Resultscustomer experience through such items as website design and package lockers, which meet today’s customer preference for self-service. These and other innovations contributed to a growth rate in controllable operating expense, which we define as property expenses less taxes, insurance and utility expenses, compounding for the past decade at an annual rate of Operations discussion within Item 7 for further information regarding our cost controls.0.1%.
MaintainingImproving and ImprovingMaintaining Apartment Community Quality. We believe that the physical condition and amenities of our apartment communities are important factors in our ability to maintain and increase rental rates. We invest in the maintenance and improvement of our apartment communities primarily through: Capital Improvements, which are non-redevelopment capital additions that are made to enhance the value, profitability or useful life of an asset from its condition at the date of our purchase; Capital Replacements, which are capital additions made to replace capital assets consumed during our ownership; and Property Upgrades,Enhancements, which may include kitchen and bath remodeling, energy conservation projects and investments in longer-lived materials designedas described above, all of which are generally lesser in scope than is a redevelopment and do not significantly disrupt property operations; Capital Improvements, which extend the useful life of an apartment community from its condition at our date of purchase; and Capital Replacements, which are capital additions made to reduce turnover costs, suchreplace the portion of an apartment community consumed during our ownership. During 2018, we invested approximately $2,890 per apartment home in Capital Enhancements, $4,670 per apartment home in Capital Improvements planned as simulated wood flooringpart of our initial investment in apartment communities acquired in 2018, $270 per apartment home in Capital Improvements for apartment communities acquired prior to 2018, and granite countertops.$1,052 per apartment home in Capital Replacements.
Redevelopment
Our second line of business is the redevelopment and Developmentlimited development of apartment communities. Through these activities, we expect to create value by repositioning communities within our portfolio. Over the past five years, we have spent approximately $1.0 billion on redevelopment and development, resulting in estimated value creation of approximately $400.0 million. We measure the rate and quality of financial returns by NAV creation, an important component of Economic Income, our primary measure of

long-term financial performance. We invest in the redevelopment of certain apartment communities in superior locations, when we believe the investment will yieldto earn risk-adjusted returns in excess of those expected from the apartment communities sold in paired trades or in excess of the cost of equity issued to fund the equity component of the redevelopments. redevelopment or development.
We have historically undertakenundertake a range of redevelopment projects: fromredevelopments, including those in which buildings or exteriors are renovated without the need to vacate apartment homes; to those in which significant renovation of apartment homes may be accomplished upon lease expiration;expiration and toturnover; and those in which an entire building or community is wholly vacated. We primarilyoften execute our redevelopment projects using a phased approach, wherein which we renovate portions of an apartment community in stages, which allows additional flexibility in project costs and the ability to tailor our product offerings to customer response and rent achievement.stages. Redevelopment and development work may include seeking entitlements from local governments, which for redevelopments, enhance the value of our existing portfolio by increasing density, that is, the right to add apartment homes to a site.
We have a specialized Redevelopment and Construction Services team which oversees these projects and uses third party contractors with expertise in the local markets.
On a more limited basis, we mayalso undertake ground-up development when warranted by risk-adjusted investment returns, either directly or in connection with the redevelopment of an existing apartment community or atcommunity. When warranted, we rely on the expertise and credit of a new location. In the very limited instances where we elect to complete ground-up development in a new location (such as our One Canal development in Boston, Massachusetts), we have done sothird-party developer familiar with a third party development partner with expertise in the local market to limit our exposure to construction risk. Of these two activities, we favor redevelopment because it permits adjustment to the scope and where such partner has accepted or substantially mitigated entitlementtiming of spending to align with changing market conditions and construction risks.customer preferences.
Portfolio Management
PortfolioOur portfolio management strategy involves the ongoing allocation of investment capital to meet our geographicenhance rent growth and product type goals.increase long-term capital values through portfolio design, emphasizing land value as well as location and submarket. We target geographic diversification in our portfolio in order to optimize risk-adjusted returnsreduce the volatility of our rental revenue and to avoidreduce the risk of undue concentration in any particular market. WeSimilarly, we seek to balance the portfolioprice point diversification by owning communities that offer apartment homes with a range of prices so as to diversify our exposure to economic downturns and toat rents below those asked by competitive new building supply. We also seek to own properties with the potential for profitable redevelopment.
Our portfolio strategy seeks predictable rent growth from a portfolio of apartment communities is diversified across “A,” “B”“B,” and “C+” quality conventional apartment communities,price points, averaging “B/B+” in quality and is also diversified amongacross several of the largest coastal and job growth markets in the United States,

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as measured by total apartment value. We measure conventional apartment community quality by comparingStates. Please refer to the average rentsExecutive Overview heading under Item 7 for a description of our apartment homesportfolio quality ratings. At December 31, 2018, our Real Estate portfolio was allocated about one-half to local market average rents as reported by a third-party provider of commercial real estate performance“A” rated properties, and analysis. Under this rating system, we classify as “A” quality apartment communities those earning rents greater than 125% of the local market average, as “B” quality apartment communities those earning rents between 90% and 125% of the local market average; “C+” quality assets are those with rents greater than $1,100 per month, but lower than 90% of local market average; and “C” quality assets are those with rents less than $1,100 per month and lower than 90% of local market average. We classify as “B/B+” quality a portfolio that on average earns rents between 100% and 125% of the local market average rents where the portfolio is located. Although some companies and analysts within the multifamily real estate industry use apartment community class ratings of “A,”about one-half to “B” and “C,“C+somerated properties.
As part of which are tied to local market rent averages, the metrics used to classify apartment community quality as well as the timing for which local markets rents are calculated may vary from company to company. Accordingly, our rating system for measuring apartment community quality is neither broadly nor consistently used in the multifamily real estate industry.
Our portfolio strategy, iswe seek to sell each year the 5%up to 10% of our portfolio with lower projected returns, lower operating margins,annually and lower expected future rent growth, andto reinvest the sale proceeds from such sales in apartmentaccretive uses such as capital enhancements, redevelopments, limited development and selective acquisitions with projected Free Cash Flow internal rates of return higher than expected from the communities already in our portfolio, through property upgrades and redevelopment, or through the purchase of other apartment communities and, in limited situations, the development of apartment communities. We execute our strategy through paired trades when the investment will yield risk-adjusted returns in excess of those of the apartment community sold and when portfolio quality is enhanced. Whenever possible, we structure transactions in a tax-efficient manner to preserve our invested capital.being sold.
Balance Sheet and Liquidity
Our leverage strategy seeks to increasemagnify financial returns while using leverage with appropriate caution. We limit risk through balance sheet structure, employing low leverage, primarily non-recourse and long-dated property debt; build financial flexibility by maintaining ample unused and available credit as well as holding properties with substantial value unencumbered by property debt; and use partners’ capital when it enhances financial returns or reduces investment risk.
Our leverage includes our share of long-term, non-recourse, property debt encumbering apartment communities, outstanding borrowings under our revolving credit facility, and outstanding preferred equity.
We target thea ratio of Proportionate Debt plusand Preferred Equity to Adjusted EBITDA to be below 7.0x and we target thea ratio of Adjusted EBITDA Coverage ofto Adjusted Interest Expense and Preferred Dividends to be greater than 2.5x. We also focus on theOur ratios as of Debt to Adjusted EBITDA and Adjusted EBITDA Coverage of Interest.
The majority of our leverage, approximately 93% at December 31, 2015,2018 were 7.2x and 3.4x, respectively.
Our liquidity consists of property-level, non-recourse, long-dated debt,cash balances and 6% atavailable capacity on our revolving line of credit. As of December 31, 2015, consists2018, we had cash and restricted cash of perpetual preferred equity, a combination which reduces$72.6 million and had capacity to borrow $632.5 million under our refunding and re-pricing risk. The majority of our property-level debt is fixed-rate, which provides a hedge against increases in interest rates, capitalization rates and inflation. Although our primary sources of leverage are property-level, non-recourse, long-dated, fixed-rate, amortizing debt and perpetual preferred equity, we also have a revolving credit arrangement whichfacility.
We manage our financial flexibility by maintaining an investment grade rating and holding apartment communities that are unencumbered by property debt. As of December 31, 2018, we useheld unencumbered apartment communities with an estimated fair market value of approximately $2.7 billion, up 50% from December 31, 2017.
Please refer to the Executive Overview and Liquidity and Capital Resources headings under Item 7 for working capitaladditional information regarding our balance sheet and other short-term purposes.liquidity.
Team and Culture
Our team and culture is the keyare keys to our success. Our emphasisintentional focus on a collaborative respectful, and performance-orientedproductive culture based on respect for others and personal responsibility is what enablesreinforced by a preference for promotion from within. We focus on succession planning and talent development to produce a strong, stable team that is the continuing transformationenduring foundation of the Aimco business.our success. In 2015, Aimco was2018, we were recognized

by the Denver Post as a Top Work Place for the thirdsixth consecutive year.year, an accomplishment shared with only seven other companies in Colorado.
Competition
In attracting and retaining residents to occupy our apartment communities we compete with numerous other housing alternatives.providers. Our apartment communities compete directly with other rental apartments as well as condominiums and single-family homes that are available for rent or purchase in the markets in which our apartment communities are located. Principal factors of competition include rent or price charged, attractiveness of the location and apartment community, and the quality and breadth of services. The number of competitive apartment communities relative to demand in a particular area has a material effect on our ability to lease apartment homes at our communities and on the rents we charge. In certain markets, there exists an oversupply of newly-constructed apartment homes, single-family homes, and condominiums relative to consumer demand, which affectaffects the pricing and occupancy of our rental apartments.
We also compete with other real estate investors, including other apartment REITs, pension and investment funds, partnerships and investment companies in acquiring, redeveloping, managing, obtaining financing for and disposing of apartment communities. This competition affects our ability to acquire apartment communities we want to add to our portfolio and the price that we pay in such acquisitions; our ability to finance or refinance communities in our portfolio and the cost of such financing; and our ability to dispose of communities we no longer desire to retain in our portfolio and the timing and price for whichavailable to us when we seek to dispose of such communities.

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Taxation
Aimco
Aimco has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended, which we refer to as the Code, commencing with our taxable year ended December 31, 1994, and intends to continue to operate in such a manner. Aimco’s current and continuing qualification as a REIT depends on its ability to meet theThe Code imposes various requirements imposed by the Code, which relaterelated to organizational structure, distribution levels, diversity of stock ownership, and certain restrictions with regard to owned assets and categories of income.income that must be met in order to continue to qualify as a REIT. If Aimco continues to qualify for taxation as a REIT, Aimco will generally not be subject to United States Federalfederal corporate income tax on its taxable income that is currently distributed to stockholders. This treatment substantially eliminates the “double taxation” (at the corporate and stockholder levels) that generally results from an investment in a corporation.
Even if Aimco continues to qualify as a REIT, Aimco may be subject to United States Federal income and excise taxes in various situations, such as on its undistributed income. Aimco also will be required to pay a 100% tax on any net income on non-arm’s length transactions between Aimco and a taxable REIT subsidiary (described below) and on any net income from sales of apartment communities that were held for sale to customers in the ordinary course. In addition, Aimco could also be subject to the alternative minimum tax, or AMT, on items of tax preference. State and local tax laws may not conform to the United States Federal income tax treatment, and Aimco may be subject to state or local taxation in various state or local jurisdictions, including those in which Aimco transacts business. Any taxes imposed on Aimco reduce our operating cash flow and net income.
Certain of Aimco’s operations or a portion thereof, including property management, asset management and risk management are conducted through taxable REIT subsidiaries, each of which we refer to as a TRS. A TRS is a subsidiary C-corporation that has not elected REIT status and, as such, is subject to United States Federalfederal corporate income tax. We use TRS entities to facilitate our ability to offer certain services and activities to our residents and investment partners that cannot be offered directly by a REIT. We also use TRS entities to hold investments in certain apartment communities.
The Aimco Operating Partnership
The Aimco Operating Partnership is treated as a “pass-through” entity for United States Federalfederal income tax purposes and is not subject to United States Federalfederal income taxation. Each of its partners,Partners in the Aimco Operating Partnership, however, isare subject to tax on his or hertheir allocable share of partnership tax items, including partnership income, gains, losses, deductions and credits, or Partnership Tax Items, for each taxable year during which he or she is a partner, regardless of whether he or she receivesthe partners receive any actual distributions of cash or other property from the Aimco Operating Partnership during the taxable year. Generally, the characterization of any particular partnership tax item is determined by us,the Aimco Operating Partnership, rather than at the partner level, and the amount of a partner’s allocable share of such item is governed by the terms of the Aimco Operating Partnership’s Partnership Agreement. AIMCO-GP, Inc., the general partner, is our “tax matters partner” for United States Federal income tax purposes. The tax matters partner is authorized, but not required, to take certain actions on behalf of the Aimco Operating Partnership with respect to tax matters. The Aimco Operating Partnership is subject to tax in certain states.
Regulation
General
Apartment communities and their owners are subject to various laws, ordinances, and regulations, including those related to real estate broker licensing and regulations relating to recreational facilities such as swimming pools, activity centers and other common areas. Changes in laws increasing the potential liability for environmental conditions existing on apartment communities or increasing the restrictions on discharges or other conditions, as well as changes in laws affecting development, construction, and safety requirements, may result in significant unanticipated expenditures, which would adversely affect our net income and cash flows from operating activities. In addition, existing rent control laws, as well as future enactment of rent control or rent stabilization laws, such as legislation that has been considered in New York and certain cities in California, or other laws regulating multifamily housing, may reduce rental revenue or increase operating costs in particular markets.

Environmental
Various Federal,federal, state and local laws subject apartment community owners or operators to liability for management, and the costs of removal or remediation, of certain potentially hazardous materials that may be present at an apartment community. These materials may include lead-based paint, asbestos, polychlorinated biphenyls and petroleum-based fuels. Such laws often impose liability without regard to fault or whether the owner or operator knew of, or was responsible for, the release or presence of such materials. In connection with the ownership, operation and management of apartment communities, we could potentially be liable for environmental liabilities or costs associated with our current apartment communities, communities we acquire or manage in

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the future, or communities we previously owned or operated in the past. These and other risks related to environmental matters are described in more detail in Item 1A, “Risk1A. Risk Factors.
Insurance
Our primary lines of insurance coverage are property, general liability and workers’ compensation. We believe that our insurance coverages adequately insure our apartment communities against the risk of loss attributable to fire, earthquake, hurricane, tornado, flood, terrorism and other perils, and adequately insure us against other risk. Our coverage includes deductibles, retentions and limits that are customary in the industry. We have established loss prevention, loss mitigation, claims handling and litigation management procedures to manage our exposure.
Employees
At December 31, 2015,2018, we had 1,591 employees,approximately 1,050 team members, of which 1,108whom about 700 were at the apartment community level performing various on-site functions or at our shared service center performing tasks that have been centralized there, with the balance managing corporate and area operations,functions, including investment and debt transactions, legal, financial reporting,finance and accounting, information systems, human resources and other support functions. As of December 31, 2015,2018, unions represented 89approximately 50 of our employees.team members. We have never experienced a work stoppage and believe we maintain satisfactory relations with our employees.team members.
Available Information
Our combined Annual Report on Form 10-K, our combined Quarterly Reports on Form 10-Q, Current Reports on Form 8-K filed by Aimco or the Aimco Operating Partnership and any amendments to any of those reports that we file with the Securities and Exchange Commission are available free of charge as soon as reasonably practicable through Aimco’s website at www.aimco.com. The information contained on Aimco’s website is not incorporated into this Annual Report. Aimco’s Common Stock is listed on the New York Stock Exchange under the symbol “AIV.” In 2015,2018, Aimco’s chief executive officer submitted his annual corporate governance listing standards certification to the New York Stock Exchange, which certification was unqualified.
Item 1A. Risk Factors
The risk factors noted in this section and other factors noted throughout this Annual Report, describe certain risks and uncertainties that could cause our actual results to differ materially from those contained in any forward-looking statement.
Redevelopment, development and construction risks could affect our profitability.
We are currently redeveloping and we intend to continue to redevelop, certain of our apartment communities. Additionally, we are developing a 12-story apartment building in Boston, Massachusetts. During 2016,2019, we expect to invest approximately $180invest $225 million to $220$275 million in conventional redevelopmentredevelopment and development activities. Redevelopment and development activities are subject to numerous risks, including the following risks:following:
we may be unable to obtain, or experience delays in obtaining, necessary zoning, occupancy or other required governmental or third partythird-party permits and authorizations, which could result in increased costs or the delay or abandonment of opportunities;
we may incur costs that exceed our original estimates due to increased material, labor or other costs, such as litigation;
we may be unable to complete construction and lease uplease-up of an apartment community on schedule, resulting in increased construction and financing costs and a decrease in expected rental revenues;
occupancy rates and rents at an apartment community may fail to meet our expectations for a number of reasons, including changes in market and economic conditions beyond our control and the development by competitors of competing communities;
we may be unable to obtain financing with favorable terms, or at all, which may cause us to delay or abandon an opportunity;
we may abandon opportunities that we have already begun to explore, or stop projects we have already commenced, for a number of reasons, including changes in local market conditions or increases in construction or financing costs, and, as a result, we may fail to recover costs already incurred in exploring those opportunities;
we may incur liabilities to third parties during the redevelopment or development process;

unexpected events or circumstances may arise during the redevelopment or development process that affect the timing of completion and the cost and profitability of the project;redevelopment or development; and
loss of a key member of a projectredevelopment or development team could adversely affect our ability to deliver projectsredevelopments and developments on time and within our budget.

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If we are not successful in our acquisition of apartment communities, our results of operations could be adversely affected.
The selective acquisition of apartment communities is a component of our strategy. However, we may not be able to complete transactions successfully in the future. Although we seek to acquire apartment communities when such acquisitions increase our Net Asset Value, Adjusted Funds From Operations, Pro forma Funds From Operations and property net operating income, such transactions may fail to perform in accordance with our expectations. In particular, following acquisition, the value and operational performance of an apartment community may be diminished if obsolescence or neighborhood changes occur before we are able to redevelop or sell the community.
Acquisitions of under development or unoccupied apartment communities may fail to perform as expected.
We may acquire apartment communities that are under development or otherwise unoccupied at the time of acquisition, and we may not be able to achieve expected occupancy levels or rental rates for these communities, resulting in lower than expected net operating income. Additionally, we may underestimate the costs necessary to bring such communities up to expected occupancy levels, which may result in lower than expected net operating income for these communities.
Because real estate investments are relatively illiquid, we may not be able to sell apartment communities when appropriate.
Real estate investments are relatively illiquid and cannot always be sold quickly. REIT tax rules also restrict our ability to sell apartment communities. Thus, we may not be able to change our portfolio promptly in response to changes in economic or other market conditions. Our ability to dispose of apartment communities in the future will depend on prevailing economic and market conditions, including the cost and availability of financing. This could have a material adverse effect on our financial condition or results of operations.
Competition could limit our ability to lease apartment homes or increase or maintain rents.
Our apartment communities compete for residents with other housing alternatives, including other rental apartments and condominiums, and, to a lesser degree, single-family homes that are available for rent, as well as new and existing condominiums and single-family homes for sale. Competitive residential housing as well as household formation and job creation in a particular area could adversely affect our ability to lease apartment homes and to increase or maintain rental rates.
Failure to generate sufficient net operating income may adversely affect our liquidity, limit our ability to fund necessary capital expenditures or adversely affect our ability to pay dividends or distributions.
Our ability to fund necessary capital expenditures on our apartment communities depends on, among other things, our ability to generate net operating income in excess of required debt payments. If we are unable to fund capital expenditures on our apartment communities, we may not be able to preserve the competitiveness of our communities, which could adversely affect ourtheir net operating income and long termlong-term value.
Our ability to make payments to our investors depends on our ability to generate net operating income in excess of required debt payments and capital expenditure requirements. Our net operating income and liquidity may be adversely affected by events or conditions beyond our control, including:
the general economic climate;
an inflationary environment in which the costs to operate and maintain our communities increase at a rate greater than our ability to increase rents, which we can only do upon renewal of existing leases or at the inception of new leases;
competition from other apartment communities and other housing options;
local conditions, such as loss of jobs, unemployment rates or an increase in the supply of apartments, that might adversely affect apartment occupancy or rental rates;
changes in governmental regulations and the related cost of compliance;
changes in tax laws and housing laws, including the enactment of rent control laws or other laws regulating multifamily housing; and
changes in interest rates and the availability of financing.

Competition could limit our ability to lease apartment homes or increase or maintain rents.
8Our apartment communities compete for residents with other housing alternatives, including other rental apartments and condominiums, and, to a lesser degree, single-family homes that are available for rent, as well as new and existing condominiums and single-family homes for sale. Competitive residential housing as well as household formation and job creation in a particular area could adversely affect our ability to lease apartment homes and to increase or maintain rental rates.
Because real estate investments are relatively illiquid, we may not be able to sell apartment communities when appropriate.

TableReal estate investments are relatively illiquid and generally cannot be sold quickly. REIT tax rules also restrict our ability to sell apartment communities. Thus, we may not be able to change our portfolio promptly in response to changes in economic or other market conditions. Our ability to dispose of Contentsapartment communities in the future will depend on prevailing economic and market conditions, including the cost and availability of financing. This could have a material adverse effect on our financial condition or results of operations.
If we are not successful in our acquisition of apartment communities, our results of operations could be adversely affected.

The selective acquisition of apartment communities is a component of our strategy. However, we may not be able to complete transactions successfully in the future. Although we seek to acquire apartment communities when such acquisitions increase our Free Cash Flow internal rate of returns and are accretive to Net Asset Value, such transactions may fail to perform in accordance with our expectations. In particular, following acquisition, the value and operational performance of an apartment community may be diminished if obsolescence or neighborhood changes occur before we are able to redevelop or sell the community. This could have an adverse effect on our financial condition or results of operations.
Our existing and future debt financing could render us unable to operate, result in foreclosure of our apartment communities, prevent us from making distributions on our equity, or otherwise adversely affect our liquidity.
We are subject to the risk that our cash flow from operations will be insufficient to make required payments of principal and interest, and the risk that existing indebtedness may not be refinanced or that the terms of any refinancing will not be as favorable as the terms of existing indebtedness. If we fail to make required payments of principal and interest on our non-recourse debt, our

lenders could foreclose on the apartment communities and other collateral securing such debt, which would result in the loss to us of income and asset value to us.value. As of December 31, 2015,2018, the majority of our apartment communities were encumbered by debt. Our organizational documents do not limit the amount of debt that we may incur, and we have significant amounts of debt outstanding. Payments of principal and interest may leave us with insufficient cash resources to operate our communities or pay distributions required to be paid in order to maintain Aimco’s qualification as a REIT.
Disruptions in the financial markets could affect our ability to obtain financing and the cost of available financing and could adversely affect our liquidity.
Our ability to obtain financing and the cost of such financing depends on the overall condition of the United States credit markets. During periods of economic uncertainty the United States credit markets may experience significant liquidity disruptions, which may cause the spreads on debt financings to widen considerably and make obtaining financing, both non-recourse property debt and corporate borrowings such as those under our Credit Agreement,revolving credit agreement, more difficult. Additionally,In particular, apartment borrowers have benefited from the historic willingness of Federal National Mortgage Association, or Fannie Mae, and the Federal Home Loan Mortgage Corporation, or Freddie Mac, to make substantial amounts of loans secured by multi-family properties, even in times of economic distress. These two lenders are federally chartered and Federal National Mortgage Association, or Fannie Mae, have historically provided significant capital atsubject to federal regulation, which is subject to change, making uncertain their prospects and ability to provide liquidity in a relatively low cost to finance multifamily properties. Freddie Mac and Fannie Mae are under conservatorship by the Housing Finance Agency, and their future role in the housing finance market is uncertain. If there is any significant reduction in Freddie Mac’s or Fannie Mae’s level of involvement in the secondary credit markets, it may adversely affect the pricing at which we may obtain non-recourse property debt financing.downturn.
If our ability to obtain financing is adversely affected, we may be unable to satisfy scheduled maturities on existing financing through other sources of liquidity, which could result in lender foreclosure on the apartment communities securing such debt and loss of income and asset value, eachboth of which would adversely affect our liquidity.
Increases in interest rates would increase our interest expense and reduce our profitability.
As of December 31, 2015, on a consolidated basis,2018, we had approximately $111.9$420.5 million of variable-rate indebtedness outstanding. We estimate that an increase in 30-day LIBOR of 100 basis points with constant credit risk spreads would result inreduce our net income and the amount of net income attributable to our common security holders (including Aimco common stockholders and the Aimco Operating Partnership’s common unitholders) being reduced (or the amounts of net loss and net loss attributable to our common equity holders being increased) by approximately $0.9$4.2 million on an annual basis.
At December 31, 2015,2018, we had approximately $137.7$72.6 million in cash and cash equivalents and restricted cash, a portion of which bear interest at variable rates indexed to LIBOR-based rates, and which may partially mitigate the effect of an increase in variable rates on our variable-rate indebtedness discussed above.
Covenant restrictions may limit our ability to make payments to our investors.
Some of our debt and other securities contain covenants that restrict our ability to make distributions or other payments to our investors unless certain financial tests or other criteria are satisfied. Our Credit Agreementrevolving credit agreement provides, among other things, that we may not make distributions to our investors during any four consecutive fiscal quarters in an aggregate amount that does not exceed the greater ofthan 95% of our Funds From Operations for such period, subject to certain non-cash adjustments, or such amount as may be necessary to maintain Aimco’s REIT status. Our outstanding classes of preferred stock or preferred units prohibit the payment of dividends on our Common Stock or common partnership units if we fail to pay the dividends to which the holders of the preferred stock or preferred units are entitled.
OurThe Aimco Operating Partnership and its subsidiaries may be prohibited from making distributions and other payments to us.payments.
All of Aimco’s apartment communities are owned, and all of Aimco’s operations are conducted, by the Aimco Operating Partnership. Further, many of the Aimco Operating Partnership’s apartment communities are owned by other subsidiaries.subsidiaries of the Aimco Operating Partnership. As a result, Aimco depends on distributions and other payments from the Aimco Operating Partnership, and the Aimco Operating Partnership depends on distributions and payments from its subsidiaries in order to satisfy our collective financial obligations and make payments to our investors. The ability of the Aimco Operating Partnership and its subsidiaries to make such distributions and other payments depends on their earnings and cash flows and may be subject to statutory or contractual limitations. As an equity investor in the Aimco Operating Partnership and its subsidiaries, our right to receive assets upon their liquidation or reorganization will be effectively subordinated to the claims of their creditors. To the extent that we are recognized as a creditor

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of such subsidiaries, our claims may still be subordinate to any security interest in or other lien on their assets and to any of their debt or other obligations that are senior to our claims.
Potential liability or other expenditures associated with potential environmental contamination may be costly.
Various Federal,federal, state and local laws subject apartment community owners or operators to liability for management, and the costs of removal or remediation, of certain potentially hazardous materials that may be present in the land or buildings of an apartment community. Potentially hazardous materials may include polychlorinated biphenyls, petroleum-based fuels, lead-based paint or asbestos.asbestos, among other materials. Such laws often impose liability without regard to fault or whether the owner or operator

knew of, or was responsible for, the presence of such materials. The presence of, or the failure to manage or remediate properly, these materials may adversely affect occupancy at such apartment communities as well as the ability to sell or finance such apartment communities. In addition, governmental agencies may bring claims for costs associated with investigation and remediation actions, damages to natural resources and for potential fines or penalties in connection with such damage or with respect to the improper management of hazardous materials. Moreover, private plaintiffs may potentially make claims for investigation and remediation costs they incur or personal injury, disease, disability or other infirmities related to the alleged presence of hazardous materials at an apartment community. In addition to potential environmental liabilities or costs associated with our current apartment communities, we may also be responsible for such liabilities or costs associated with communities we acquire or manage in the future, or apartment communities we no longer own or operate.
Laws benefiting disabled persons may result in our incurrence of unanticipated expenses.
Under the Americans with Disabilities Act of 1990, or ADA, all places intended to be used by the public are required to meet certain Federalfederal requirements related to access and use by disabled persons. The Fair Housing Amendments Act of 1988, or FHAA, requires apartment communities first occupied after March 13, 1991, to comply with design and construction requirements for disabled access. For those projectsapartment communities receiving Federalfederal funds, the Rehabilitation Act of 1973 also has requirements regarding disabled access. These and other Federal,federal, state and local laws may require structural modifications to our apartment communities or changes in policy/practice, or affect renovations of the communities. Noncompliance with these laws could result in the imposition of fines or an award of damages to private litigants and also could result in an order to correct any non-complying feature, which could result in substantial capital expenditures. Although we believe that our apartment communities are substantially in compliance with present requirements, we may incur unanticipated expenses to comply with the ADA, the FHAA and the Rehabilitation Act of 1973 in connection with the ongoing operation or redevelopment of our apartment communities.
Moisture infiltration and resulting mold remediation may be costly.
Although we are proactively engaged in managing moisture intrusion and preventing the presence of mold at our apartment communities, it is not unusual for periodic moisture intrusion issues to cause mold in isolated locations within an apartment community. We have implemented policies, procedures and training, and include a detailed moisture intrusion and mold assessment during acquisition due diligence. We believe these measures will manage mold exposure at our apartment communities and will minimize the effects that mold may have on our residents. To date, we have not incurred any material costs or liabilities relating to claims of mold exposure or to abate mold conditions. We have only limited insurance coverage for property damage claims arising from the presence of mold and for personal injury claims related to mold exposure. Because the law regarding mold is unsettled and subject to change, we can make no assurance that liabilities resulting from the presence of or exposure to mold will not have a material adverse effect on our consolidated financial condition or results of operations.
We may be subject to litigation associated with partnership transactions that could increase our expenses and prevent completion of beneficial transactions.
We have engaged in, and may continue to engage in, the selective acquisition of interests in partnerships controlled by us that own apartment communities. In some cases, we have acquired the general partner of a partnership and then made an offer to acquire the limited partners’ interests in the partnership. In these transactions, we may be subject to litigation based on claims that we, as the general partner, have breached our fiduciary duty to our limited partners or that the transaction violates the relevant partnership agreement or state law. Although we intend to comply with our fiduciary obligations and the relevant partnership agreements, we may incur costs in connection with the defense or settlement of this type of litigation. In some cases, this type of litigation may adversely affect our desire to proceed with, or our ability to complete, a particular transaction. Any litigation of this type could also have a material adverse effect on our financial condition or results of operations.

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Government housing regulations may limit the opportunities at some of our apartment communities and failure to comply with resident qualification requirements may result in financial penalties and/or loss of benefits, such as rental revenues paid by government agencies. Additionally, the government may cease to operate or reduce funding for government housing programs which would result in a loss of benefits.
We own equity interests in consolidated and unconsolidated entities that own certain apartment communities that benefit from governmental programs intended to provide housing to people with low or moderate incomes. These programs, which are usually administered by the United States Department of Housing and Urban Development, or HUD, or state housing finance agencies, typically provide one or more of the following: mortgage insurance; favorable financing terms; tax-exempt interest; historic or low-income housing tax-credits; or rental assistance payments to the apartment community owners. As a condition of the receipt of assistance under these programs, the apartment communities must comply with various requirements, which typically limit rents to pre-approved amounts and limit our choice of residents to those with incomes at or below certain levels. Failure to comply with these requirements may result in financial penalties or loss of benefits. We are usually required to obtain the approval of HUD in order to acquire or dispose of a significant interest in or manage a HUD-assisted apartment community. We may not always receive such approval.
Additionally, there is no guarantee that the government will continue to operate these programs or that the programs will be operated in a manner that generates benefits consistent with those received in the past. Any cessation of or change in the administration of benefits from these government housing programs may result in our loss or reduction in the amount of the benefits we receive under these programs, including rental subsidies. During 2015, 2014 and 2013, for continuing and discontinued operations, our rental revenues include $73.4 million, $74.6 million and $88.4 million, respectively, of subsidies from government agencies. Of the 2015 subsidies, approximately 14.5% related to communities benefiting from housing assistance contracts that expired in late 2015 or expire in 2016, which we are in the process of renewing or anticipate renewing, and the remainder related to communities benefiting from housing assistance contracts that expire after 2016 and have a weighted average term of 8.2 years. Any loss or reduction in the amount of these benefits may adversely affect our liquidity and results of operations.
Although we are insured for certain risks, the cost of insurance, increased claims activity or losses resulting from casualty events may affect our operating results and financial condition.
We are insured for a portion of our consolidated apartment communities’ exposure to casualty losses resulting from fire, earthquake, hurricane, tornado, flood and other perils, which insurance is subject to deductibles and self-insurance retention. We recognize casualty losses or gains based on the net book value of the affected apartment community and the amount of any related insurance proceeds. In many instances, the actual cost to repair or replace the apartment community may exceed its net book value and any insurance proceeds. We recognize the uninsured portion of losses as casualty losses in the periods in which they are incurred. In addition, we are self-insured for a portion of our exposure to third-party claims related to our employee health insurance plans, workers’ compensation coverage and general liability exposure. With respect to our exposure to claims of third parties, we establish reserves at levels that reflect our known and estimated losses. The ultimate cost of losses and the impact of unforeseen events may vary materially from recorded reserves, and variances may adversely affect our operating results and financial condition. We purchase insurance to reduce our exposure to losses and limit our financial losses on large individual risks. The availability and cost of insurance are determined by market conditions outside our control. No assurance can be made that we will be able to obtain and maintain insurance at the same levels and on the same terms as we do today. If we are not able to obtain or maintain insurance in amounts we consider appropriate for our business, or if the cost of obtaining such insurance increases materially, we may have to retain a larger portion of the potential loss associated with our exposures to risks.
Natural disasters and severe weather may affect our operating results and financial condition.
Natural disasters such as earthquakes and severe weather such as hurricanes may result in significant damage to our apartment communities. The extent of our casualty losses and loss in operating income in connection with such events is a function of the severity of the event and the total amount of exposure in the affected area. When we have geographic concentration of exposures, a single catastrophe (such as an earthquake) or destructive weather event (such as a hurricane) affecting a region may have a significant adverse effect on our financial condition and results of operations. We cannot accurately predict natural disasters or severe weather, or the number and type of such events that will affect us. As a result, our operating and financial results may vary significantly from one period to the next. Although we anticipate and plan for losses, there can be no assurance that our financial

results will not be adversely affected by our exposure to losses arising from natural disasters or severe weather in the future that exceed our previous experience and assumptions.
We depend on our senior management.
Our success depends upon the retention of our senior management, including Terry Considine, our chief executive officer. We have a succession planning and talent development process that is designed to identify potential replacements and develop our team members to provide depth in the organization and a bench of talent on which to draw. However, there are no assurances that

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we would be able to find qualified replacements for the individuals who make up our senior management if their services were no longer available. The loss of services of one or more members of our senior management team could have a material adverse effect on our business, financial condition and results of operations. We do not currently maintain key-man life insurance for any of our employees.
Aimco may fail to qualify as a REIT.
If Aimco fails to qualify as a REIT, Aimco will not be allowed a deduction for dividends paid to its stockholders in computing its taxable income, and will be subject to United States Federalfederal income tax at regular corporate rates, including any applicable AMT.rates. This would substantially reduce our funds available for distribution to our investors. Unless entitled to relief under certain provisions of the Code, Aimco also would be disqualified from taxation as a REIT for the four taxable years following the year during which it ceased to qualify as a REIT. In addition, Aimco’s failure to qualify as a REIT would place us in default under our Credit Agreement.revolving credit agreement.
We believe that Aimco operates, and has since its taxable year ended December 31, 1994, operated, in a manner that enables it to meet the requirements for qualification as a REIT for United States Federalfederal income tax purposes. Aimco’s continued qualification as a REIT will depend on its satisfaction of certain asset, income, investment, organizational, distribution, stockholder ownership and other requirements on a continuing basis. Aimco’s ability to satisfy the asset tests depends upon our analysis of the fair market values of our assets, some of which are not susceptible to a precise determination, and for which we do not obtain independent appraisals. Aimco’s compliance with the REIT annual income and quarterly asset requirements also depends upon our ability to manage successfully the composition of our income and assets on an ongoing basis. Moreover, the proper classification of an instrument as debt or equity for United States Federalfederal income tax purposes may be uncertain in some circumstances, which could affect the application of the REIT qualification requirements. Accordingly, there can be no assurance that the Internal Revenue Service, or the IRS, will not contend that our interests in subsidiaries or other issuers constitutes a violation of the REIT requirements. Moreover, future economic, market, legal, tax or other considerations may cause Aimco to fail to qualify as a REIT, or Aimco’s Board of Directors may determine to revoke its REIT status.
REIT distribution requirements limit our available cash.
As a REIT, Aimco is subject to annual distribution requirements. As Aimco’s operating partnership, theThe Aimco Operating Partnership pays distributions intended to enable Aimco to satisfy Aimco’sits distribution requirements. This limits the amount of cash available for other business purposes, including amounts to fund our growth. Aimco generally must distribute annually at least 90% of its REIT taxable income, determined without regard to the dividends paid deduction and excluding any net capital gain, in order for its distributed earnings not to be subject to United States Federalfederal corporate income tax. We intend to make distributions to Aimco’s stockholders to comply with the requirements of the Code. However, differences in timing between the recognition of taxable income and the actual receipt of cash could require us to sell apartment communities or borrow funds on a short-term or long-term basis to meet the 90% distribution requirement of the Code.
Aimco may be subject to federal and state income taxes, in certain circumstances.
Even if Aimco qualifies as a REIT, Aimco may be subject to United States Federalfederal income and excise taxes in various situations, such as on its undistributed income. Aimco could also be required to pay a 100% tax on any net income on non-arm'snon-arm’s length transactions between Aimco and a taxable REIT subsidiary and on any net income from sales of apartment communities that were held for sale to customersprimarily in the ordinary course. In addition, Aimco could be subject to alternative minimum tax, or AMT, on items of tax preference. State and local tax laws may not conform to the United States Federalfederal income tax treatment, and Aimco may be subject to state or local taxation in various state or local jurisdictions including those in which Aimco transacts business. Any taxes imposed on Aimco would reduce our operating cash flow and net income and could negatively impact our ability to pay dividends and distributions.
Recent Tax Legislation Impacts CertainDividends payable by REITs do not qualify for the reduced tax rates available for some dividends.
REITs are entitled to a United States federal tax deduction for dividends paid to their stockholders. As compared to other taxable corporations, this ability to reduce or eliminate the REIT’s taxable income by paying dividends to stockholders is a principal benefit of maintaining REIT status, generally resulting in a lower combined tax liability of the REIT and its stockholders as

compared to that of the combined tax liability of other taxable corporations and their stockholders. Notwithstanding this combined benefit, dividends payable by REITs may result in marginally higher taxes to the stockholder.
C-corporations are generally required to pay United States federal income tax on earnings. After tax earnings are then available for stockholder dividends. The maximum U.S. Federal Income Tax Rules Applicablefederal tax rate applicable to income from “qualified dividends” payable to United States stockholders that are individuals, trusts and estates is currently 20%, plus the 3.8% investment tax surcharge. While dividends payable by REITs are generally not eligible for the qualified dividend reduced rates, stockholders that are individuals, trusts or estates may deduct 20% of the aggregate amount of ordinary dividends from REITs. This deduction is available for taxable years beginning after December 31, 2017, and before January 1, 2026, and will generally cause the maximum tax rate for ordinary dividends from REITs to be 29.6%, plus the 3.8% investment tax surcharge. The more favorable tax rates applicable to regular corporate qualified dividends could cause investors who are individuals, trusts and estates to perceive investments in REITs to be relatively less attractive than investments in the shares of non-REIT corporates that pay dividends, which could adversely affect the value of the shares of REITs, including Aimco Common Stock.
Changes to United States federal income tax laws could materially and adversely affect Aimco and Aimco’s stockholders.
The recently enacted Protecting Americans from Tax Hikes Actpresent United States federal income tax treatment of 2015,REITs may be modified, possibly with retroactive effect, by legislative, judicial or PATH Act, contains changes to certain aspectsadministrative action at any time, which could affect the United States federal income tax treatment of the U.S.an investment in Aimco Common Stock. The United States federal income tax rules applicabledealing with REITs constantly are under review by persons involved in the legislative process, the IRS and the United States Treasury Department, which results in statutory changes as well as frequent revisions to REITs.  The PATH Act modifiesregulations and interpretations. We cannot predict how changes in the tax laws might affect Aimco or Aimco’s stockholders. Revisions in federal tax laws and interpretations thereof could significantly and negatively affect Aimco’s ability to qualify as a REIT and the tax considerations relevant to an investment in Aimco Common Stock, or could cause Aimco to change its investments and commitments.
Government housing regulations may limit the opportunities at some of our apartment communities and failure to comply with resident qualification requirements may result in financial penalties and/or loss of benefits, such as rental revenues paid by government agencies. Additionally, the government may cease to operate or reduce funding for government housing programs which would result in a loss of benefits from those programs.
We own equity interests in entities that own certain apartment communities that benefit from governmental programs intended to provide housing to people with low or moderate incomes. These programs, which are usually administered by the United States Department of Housing and Urban Development, or HUD, or state housing finance agencies, typically provide one or more of the following: mortgage insurance; favorable financing terms; tax-exempt interest; historic or low-income housing tax credits; or rental assistance payments to the apartment community owners. As a condition of the receipt of assistance under these programs, the apartment communities must comply with various rules that applyrequirements, which typically limit rents to a REIT’s ownershippre-approved amounts and limit our choice of and business relationshipresidents to those with its TRS entities and reduces (beginningincomes at or below certain levels. Failure to comply with these requirements may result in 2018)financial penalties or loss of benefits. We are usually required to obtain the valueapproval of HUD in order to acquire or dispose of a REIT’s assets thatsignificant interest in or manage a HUD-assisted apartment community. We may be in TRS entities from 25% to 20%.  The PATH Act makes permanent the reduction of the period (from ten years to five years) during which a REIT is subject to corporate-level tax on the recognition of built-in gains in assets of an acquired corporation.  The PATH Act also makes multiple changes related to the Foreign Investment in Real Property Tax Act, expands prohibited transaction safe harbors and qualifying hedges, and repeals the preferential dividend rule for publicly-offered REITs.  Lastly, the PATH Act adjusts the way a REIT calculates earnings and profits in certain circumstances to avoid double taxation at the shareholder level, and expands the types of assets and income treated as qualifying for purposes of the REIT requirements.  Investors are urged to consult their tax advisors with respect to these changes and the potential impact on their investment in our common stock and debt securities.not always receive such approval.

12


Limits on ownership of shares specified in Aimco’s charter may result in the loss of economic and voting rights by purchasers that violate those limits.
Aimco’s charter limits ownership of Common Stock by any single stockholder (applying certain “beneficial ownership” rules under the Federalfederal securities laws) to 8.7% (or up to 12.0% upon a waiver from Aimco’s Board of Directors) of outstanding shares of Common Stock, or 15% in the case of certain pension trusts, registered investment companies and Mr. Considine (or up to 18.0% for such pension trusts or registered investment companies upon a waiver from Aimco’s Board of Directors). Aimco’s charter also limits ownership of Aimco’s Common Stock and preferred stock by any single stockholder to 8.7% of the value of the outstanding Common Stock and preferred stock, or 15% in the case of certain pension trusts, registered investment companies and Mr. Considine. The charter also prohibits anyone from buying shares of Aimco’s capital stock if the purchase would result in Aimco losing its REIT status. This could happen if a transaction results in fewer than 100 persons owning all of Aimco’s shares of capital stock or results in five or fewer persons (applying certain attribution rules of the Code) owning 50% or more of the value of all of Aimco’s shares of capital stock. If anyone acquires shares in excess of the ownership limit or in violation of the ownership requirements of the Code for REITs:
the transfer will be considered null and void;
we will not reflect the transaction on Aimco’s books;
we may institute legal action to enjoin the transaction;

we may demand repayment of any dividends received by the affected person on those shares;
we may redeem the shares;
the affected person will not have any voting rights for those shares; and
the shares (and all voting and dividend rights of the shares) will be held in trust for the benefit of one or more charitable organizations designated by Aimco.
Aimco may purchase the shares of capital stock held in trust at a price equal to the lesser of the price paid by the transferee of the shares or the then current market price. If the trust transfers any of the shares of capital stock, the affected person will receive the lesser of the price paid for the shares or the then current market price. An individual who acquires shares of capital stock that violate the above rules bears the risk that the individual:
may lose control over the power to dispose of such shares;
may not recognize profit from the sale of such shares if the market price of the shares increases;
may be required to recognize a loss from the sale of such shares if the market price decreases; and
may be required to repay to us any distributionsdividends received from us as a result of his or her ownership of the shares.
Aimco’s charter may limit the ability of a third partythird-party to acquire control of Aimco.
The 8.7% and other ownership limitlimits discussed above may have the effect of delaying or precluding acquisition by a third-party of control of Aimco by a third party without the consent of Aimco’s Board of Directors. Aimco’s charter authorizes its Board of Directors to issue up to 510,587,500 shares of capital stock. As of December 31, 2015,2018, 500,787,260 shares were classified as Common Stock, of which 156,326,416149,133,826 were outstanding, and 9,800,240 shares were classified as preferred stock, of which 6,391,6435,000,000 were outstanding. Under Aimco’s charter, its Board of Directors has the authority to classify and reclassify any of Aimco’s unissued shares of capital stock into shares of capital stock with such preferences, conversion or other rights, voting power restrictions, limitations as to dividends, qualifications or terms or conditions of redemptions as the Board of Directors may determine. The authorization and issuance of a new class of capital stock could have the effect of delaying or preventing someone from taking control of Aimco, even ifwhere there is a change in control weredifference of opinion between the Aimco Board of Directors and others as to what is in Aimco’s stockholders’ best interests.
The Maryland General Corporation Law may limit the ability of a third partythird-party to acquire control of Aimco.
As a Maryland corporation, Aimco is subject to various Maryland laws that may have the effect of discouraging offers to acquire Aimco and increasing the difficulty of consummating any such offers, even if an acquisition would bewhere there is a difference of opinion between the Aimco Board of Directors and others as to what is in Aimco’s stockholders’ best interests. The Maryland General Corporation Law, specifically the Maryland Business Combination Act, restricts mergers and other business combination transactions between Aimco and any person who acquires, directly or indirectly, beneficial ownership of shares of Aimco’s stock representing 10% or more of the voting power without Aimco’s Board of Directors’ prior approval. Any such business combination transaction could not be completed until five years after the person acquired such voting power, and generally only with the approval of stockholders representing 80% of all votes entitled to be cast and 66-2/3% of the votes entitled to be cast, excluding the interested stockholder, or upon payment of a fair price. The Maryland General Corporation

13


Law, specifically the Maryland Control Share Acquisition Act, provides generally that a person who acquires shares of Aimco’s capital stock representing 10% or more of the voting power in electing directors will have no voting rights unless approved by a vote of two-thirds of the shares eligible to vote. Additionally, the Maryland General Corporation Law provides, among other things, that the board of directors has broad discretion in adopting stockholders’ rights plans and has the sole power to fix the record date, time and place for special meetings of the stockholders. To date, Aimco has not adopted a stockholders’ rights plan. In addition, the Maryland General Corporation Law provides that a corporation that:
has at least three directors who are not officers or employees of the entity or related to an acquiring person; and
has a class of equity securities registered under the Securities Exchange Act of 1934, as amended,

may elect in its charter or bylaws or by resolution of the board of directors to be subject to all or part of a special subtitle that provides that:
the corporation will have a staggered board of directors;
any director may be removed only for cause and by the vote of two-thirds of the votes entitled to be cast in the election of directors generally, even if a lesser proportion is provided in the charter or bylaws;
the number of directors may only be set by the board of directors, even if the procedure is contrary to the charter or bylaws;
vacancies may only be filled by the remaining directors, even if the procedure is contrary to the charter or bylaws; and
the secretary of the corporation may call a special meeting of stockholders at the request of stockholders only on the written request of the stockholders entitled to cast at least a majority of all the votes entitled to be cast at the meeting, even if the procedure is contrary to the charter or bylaws.
To date, Aimco has not made any of the elections described above.
Item 1B. Unresolved Staff Comments
None.
Item 2. Properties
Additional information about our consolidated apartment communities is contained in “Schedule III - Real Estate and Accumulated Depreciation” in this Annual Report on Form 10-K. Refer to Note 4 to the consolidated financial statements in Item 8 for additional information regarding property debt.
Our Real Estate portfolio is diversified by both price point and geography and consists of market rate apartment communities in which we own a substantial interest. Our Real Estate portfolio includes garden style, mid-rise and high-rise apartment communities located in 2217 states and the District of Columbia. Our geographic allocationportfolio strategy focuses onseeks predictable rent growth from a portfolio of apartment communities diversified among some of the largest coastal and job growth markets in the United States.States, and that is diversified across “A,” “B” and “C+” price points, averaging “B/B+” in quality. As of December 31, 2018, our Real Estate portfolio consisted of roughly one-half “A” quality communities and one-half “B” and “C+” quality communities (as measured by gross asset value). Please refer to the Executive Overview heading under Item 7 for a description of our portfolio quality ratings. The following table sets forth information on all ofthe apartment communities in our apartment communitiesReal Estate portfolio as of December 31, 2015:2018:
Number of Apartment Communities Number of Apartment Homes Average OwnershipNumber of Apartment Communities Number of Apartment Homes Average Economic Ownership
Conventional:     
Atlanta8
 1,497
 99%5
 817
 100%
Bay Area11
 2,169
 100%12
 2,632
 100%
Boston15
 4,689
 100%15
 4,689
 100%
Chicago10
 3,246
 100%10
 3,246
 100%
Denver8
 2,065
 98%8
 2,151
 98%
Greater DC14
 6,547
 100%
Greater LA15
 5,313
 88%
Greater New York18
 1,040
 100%
Greater Washington, DC14
 5,900
 100%
Los Angeles13
 4,347
 100%
Miami5
 2,571
 100%5
 2,671
 100%
New York18
 1,040
 100%
Philadelphia6
 3,525
 98%8
 2,638
 97%
San Diego12
 2,423
 97%12
 2,423
 97%
Seattle2
 239
 100%2
 239
 100%
Total target markets124
 35,324
 97%
Other markets16
 5,140
 98%12
 3,756
 99%
Total conventional owned and managed140
 40,464
 98%
Affordable56
 8,685
 95%
Total196
 49,149
 97%
Total Real Estate portfolio134
 36,549
 99%

14


At December 31, 2015,2018, we owned an equity interest in and consolidated within our financial statements 185134 apartment communities containing 48,320with 36,549 apartment homes in our Real Estate portfolio. We consolidated 130 of these apartment communities with 36,407 apartment homes.
These consolidated apartment communities contain,contained, on average, 261280 apartment homes, with the largest community containing 2,113 apartment homes. These apartment communities offer residents a range of amenities, including resort pools with cabanas, grills, and other amenities, clubhouses, spas, fitness centers, package lockers, dog parks and large open spaces. Many of the apartment homes offer features such as granite countertops, wood flooring, and cabinets, stainless steel appliances, fireplaces, spacious closets, washer and dryer connections, and balconies and patios. Some of our premier apartment communities also offer premium features including designer kitchens and bathroom finishes. Additional information on our consolidated apartment communities is contained in “Schedule III - Real Estate and Accumulated Depreciation” in this Annual Report on Form 10-K. At December 31, 2015, we held an equity interest in and did not consolidate within our financial statements 11 apartment communities containing 829 apartment homes.

The majority of our consolidated apartment communities are encumbered by property debt. At December 31, 2015, 157 of2018, apartment communities in our consolidated apartment communitiesReal Estate portfolio were encumbered by, in aggregate, $3.8$3.9 billion of property debt with a weighted average interest rate of 5.01%4.18% and a weighted average maturity of 8.1 years, respectively. Each of the8.0 years. The apartment communities collateralizing this non-recourse property debt instruments comprising this total are collateralized by onehave an estimated aggregate fair value of our$10.2 billion. At December 31, 2018, we held unencumbered apartment communities without cross-collateralization, with an aggregate gross book value of $6.9 billion. Refer to Note 5 to the consolidated financial statements in Item 8 for additional information regarding our property debt. As of December 31, 2015, we had an unencumbered pool that included 25 consolidated apartment communities and had an estimated fair value of $1.8 billion. At December 31, 2015, we also had two recently acquired consolidated apartment communities which we anticipate encumbering but for which financing was not yet in place.approximately $2.7 billion.
Item 3. Legal Proceedings
As further discussed in Note 75 to the consolidated financial statements in Item 8, we are engaged in discussions with regulatory agencies regarding environmental matters at apartment communities we, or predecessor entities, previously owned. Although the outcome of the process we are undergoing for these environmental matters is uncertain, we do not expect the resolution to have a material adverse effect on our consolidated financial condition, results of operations or cash flows.
Item 4. Mine Safety Disclosures
Not applicable.

15


PART II

Item 5. Market for the Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities
Aimco
Aimco’s Common Stock has been listed and traded on the NYSE under the symbol “AIV” since July 22, 1994. The following table sets forth the quarterly high and low sales prices of our Common Stock, as reported on the NYSE, and the dividends declared in the periods indicated:
Quarter EndedHigh Low 
Dividends
Declared
(per share)
December 31, 2015$40.83
 $35.88
 $0.30
September 30, 201540.43
 34.71
 0.30
June 30, 201539.66
 36.52
 0.30
March 31, 201541.55
 36.59
 0.28
      
December 31, 2014$38.53
 $31.62
 $0.26
September 30, 201434.87
 31.51
 0.26
June 30, 201432.76
 28.95
 0.26
March 31, 201431.28
 25.52
 0.26
Aimco’s Board of Directors determines and declares its dividends. In making a dividend determination, Aimco’s Board of Directors considers a variety of factors, including: REIT distribution requirements; current market conditions; liquidity needs and other uses of cash, such as for deleveraging and accretive investment activities. Aimco’s Board of Directors targets a dividend payout ratio of approximately 65% of Adjusted Funds From Operations (which is defined in Item 7). In January 2016, Aimco’s Board of Directors declared a cash dividend of $0.33 per share on its Common Stock. On an annualized basis, this represents an increase of 12% compared to the dividends paid in 2015. This dividend is payable on February 29, 2016, to stockholders of record on February 19, 2016. Aimco’s Board of Directors anticipates similar per share quarterlycash dividends for the remainder of 2016. However, the Board of Directors may adjust the dividend amount or the frequency with which the dividend is paid based on then prevailing facts and circumstances.
On February 25, 2016, the closing price of the Common Stock was $36.62 per share, as reported on the NYSE, and15, 2019, there were 156,599,775148,766,616 shares of Common Stock outstanding, held by 1,9581,673 stockholders of record. The number of holders does not include individuals or entities who beneficially own shares but whose shares are held of record by a broker or clearing agency, but does include each such broker or clearing agency as one recordholder.record holder.
As a REIT, Aimco is required to distribute annually to holders of its Common Stock at least 90% of its “real estate investment trust taxable income,” which, as defined by the Code and United States Department of Treasury regulations, is generally equivalent to net taxable ordinary income.
From time to time, Aimco may issue shares of Common Stock in exchange for common and preferred OP Units, tendered to thedefined under The Aimco Operating Partnership heading below. Please refer to Note 7 to the consolidated financial statements in Item 8 for redemption in accordance with the terms and provisionsfurther discussion of the agreement of limited partnership of the Aimco Operating Partnership. Such shares are issued based on an exchange ratio of one share for each common OP Unit or the applicable conversion ratio for preferred OP Units. Additionally, from time to time,such exchanges. Aimco may also issue shares of Common Stock in exchange for limited partnership units in consolidated real estate partnerships that are tendered to the Aimco Operating Partnership for redemption in accordance with the terms and provisions of the related limited partnership agreement. The shares are generally issued in exchange for OP Units or limited partnership units in private transactions exempt from registration under the Securities Act of 1933, as amended, pursuant to Section 4(2) thereof. During the year ended December 31, 2015, we did not issue any shares of Common Stock in exchange for common OP Units or preferred OP Units. During the year ended December 31, 2015, we did not issue any shares of Common Stock in exchange for limited partnership interests in consolidated real estate partnerships.
Aimco’s Board of Directors has, from time to time, authorized Aimco to repurchase shares of its outstanding capital stock. There were no repurchases of Aimco shares during During the year ended December 31, 2015. As2018, Aimco did not issue any shares of Common Stock in exchange for OP Units or limited partnership interests in consolidated real estate partnerships.
The following table summarizes Aimco’s share repurchases (in thousands, except for per share data) for the three months ended December 31, 2015, Aimco was authorized to repurchase approximately 19.3 million shares. This authorization has no expiration date. These repurchases may be made from time to time in the open market or in privately negotiated transactions.2018:

16

Fiscal periodTotal Number of Shares Purchased Average Price Paid per Share Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs Maximum Number of Shares that May Yet Be Purchased Under Plans or Programs (1)
October 1 - October 31, 20181,708
 $43.91
 1,708
 17,616
November 1 - November 30, 20181,828
 45.50
 1,828
 15,788
December 1 - December 31, 20184,683
 46.00
 4,683
 11,105
Total8,219
 $45.43
 8,219
  
(1)Aimco’s Board of Directors has, from time to time, authorized Aimco to repurchase shares of its outstanding capital stock. This authorization has no expiration date. These repurchases may be made from time to time in the open market or in privately negotiated transactions.


Performance Graph
The following graph compares cumulative total returns for Aimco’s Common Stock, the MSCI US REIT Index, the NAREIT Apartment Index, and the Standard & Poor’s 500 Total Return Index (the “S&P 500”), and the NAREIT Apartment Index.. The MSCI US REIT Index is published by Morgan Stanley Capital International Inc., a provider of equity indices. The NAREIT Apartment Index is published by The National Association of Real Estate Investment Trusts, or NAREIT, a representative of real estate investment trusts and publicly traded real estate companies with interests in United States real estate and capital markets. The MSCI REIT Index reflects total shareholder return for a broad range of REITs and the NAREIT Apartment Index provides a more direct multifamily peer comparison of total shareholder return. The indices are weighted for all companies that fit the definitional criteria of the particular index and are calculated to exclude companies as they are acquired and to add themcompanies to the index calculation as they become publicly traded companies. All companies ofthat fit the definitional criteria in existenceand existed at the point in time presented are included in the index calculations. The graph assumes the investment of $100 in Aimco’s Common Stock and in each index on December 31, 2010,2013, and that all dividends paid have been reinvested. The historical information set forth below is not necessarily indicative of future performance.
chart-23721a2a503b5e1dac2.jpg
For the fiscal years ended December 31,For the fiscal years ended December 31,
Index201020112012201320142015201320142015201620172018
Aimco (1)$100.00
$90.39
$109.99
$108.83
$161.12
$179.08
100.00148.04164.54192.98191.69199.60
MSCI US REIT (1)100.00
108.69
128.00
131.17
171.01
175.32
100.00130.38133.67145.16152.52145.55
NAREIT Apartment Index (2)100.00139.62162.60167.24173.46179.88
S&P 500 (1)100.00
102.11
118.45
156.82
178.28
180.75
100.00113.69115.26129.05157.22150.33
NAREIT Apartment Index (2)100.00
115.10
123.08
115.45
161.20
187.72
(1) Source: SNL Financial LC, Charlottesville, VAS&P Global Market Intelligence © 20162019
(2) Source: National Association of Real Estate Investment Trusts
The Performance Graph will not be deemed to be incorporated by reference into any filing by Aimco under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended, except to the extent that Aimco specifically incorporates the same by reference.
The information required by Item 5 with respect to securities authorized for issuance under equity compensation plans set forth below in Part III, Item 12 of this Annual Report, is incorporated herein by reference.

17


The Aimco Operating Partnership
Interests in the Aimco Operating Partnership that are held by limited partners other than Aimco are referred to as OP Units. OP Units include common partnership units, which we refer to as common OP Units, as well as partnership preferred units, or preferred OP Units. There is no public market for the Aimco Operating Partnership’s common partnership units, including OP Units, and we have no intention of listing the common partnership units on any securities exchange. In addition, the Aimco Operating Partnership’s Partnership Agreement restricts the transferability of common partnership units, including OP Units. The following table sets forth the distributions declared per common partnership unit in each quarterly period during the two years ended December 31, 2015 and 2014:
Quarter Ended 2015 2014
December 31 $0.30
 $0.26
September 30 0.30
 0.26
June 30 0.30
 0.26
March 31 0.28
 0.26
We intend for the Aimco Operating Partnership’s future distributions per common partnership unit to be equal to Aimco’s Common Stock dividends.
At February 25, 2016,15, 2019, there were 164,453,698158,495,487 common partnership units and equivalents outstanding (156,599,775(148,766,616 of which were held by Aimco) that were held by 2,8062,515 unitholders of record.
The Aimco Operating Partnership’s Partnership Agreement generally provides that after holding common OP Units for one year, limited partners other than Aimco have the right to redeem their common OP Units for cash subject toor, at our prior right to cause Aimco to acquire some or all of the common OP Units tendered for redemption in exchange for shares of Aimco Common Stock. Common OP Units redeemed forelection, shares of Aimco Common Stock are exchanged on a one-for-one basis (subject to customary antidilution adjustments).
No common OP Units or preferred OP Units held by Limited Partners were redeemed in exchange for shares of Aimco Common Stock during the year ended December 31, 2015.2018.
The following table summarizes the Aimco Operating Partnership’s repurchases of common OP Units for the three months ended December 31, 2015:2018:
Fiscal period Total Number of Units Purchased Average Price Paid per Unit Total Number of Units Purchased as Part of Publicly Announced Plans or Programs (1) Maximum Number of Units that May Yet Be Purchased Under Plans or Programs (1)
October 1 - October 31, 2015 34,064
 $35.98
 N/A N/A
November 1 - November 30, 2015 5,436
 39.69
 N/A N/A
December 1 - December 31, 2015 3,920
 37.39
 N/A N/A
Total 43,420
 $36.57
    
Fiscal periodTotal Number of Units Purchased Average Price Paid per Unit Total Number of Units Purchased as Part of Publicly Announced Plans or Programs Maximum Number of Units that May Yet Be Purchased Under Plans or Programs
October 1 - October 31, 201811,150
 $43.96
 N/A N/A
November 1 - November 30, 20183,765
 43.47
 N/A N/A
December 1 - December 31, 201811,360
 46.45
 N/A N/A
Total26,275
 $44.97
    
(1)The terms of the Aimco Operating Partnership’s Partnership Agreement do not provide for a maximum number of units that may be repurchased, and other than the express terms of the Aimco Operating Partnership’s Partnership Agreement, the Aimco Operating Partnership has no publicly announced plans or programs of repurchase. However, whenever Aimco repurchases its Common Stock, it is expected that Aimco will fund the repurchase with a concurrent repurchase by the Aimco Operating Partnership of common partnership units held by Aimco at a price per unit that is equal to the price per share paid for the Common Stock. Refer to the preceding discussion of Aimco’s authorization for equity repurchases.
Dividend and Distribution Payments
As a REIT, Aimco is required to distribute annually to holders of its Common Stock at least 90% of its “real estate investment trust taxable income,” which, as defined by the Code and United States Department of Treasury regulations, is generally equivalent to net taxable ordinary income. Aimco’s Board of Directors determines and declares its dividends. In making a dividend determination, Aimco’s Board of Directors considers a variety of factors, including: REIT distribution requirements; current market conditions; liquidity needs; and other uses of cash, such as for deleveraging and accretive investment activities. Aimco’s Board of Directors targets a dividend payout ratio between 65% and 70% of Adjusted Funds From Operations.
In February 2019, the Aimco’s Board of Directors declared a special dividend on the common stock that consists of $67.1 million in cash and 4.5 million shares of Class A Common Stock. The special dividend will be payable on March 22, 2019, to stockholders of record as of February 22, 2019. The special dividend amount includes the regular quarterly cash dividend, which for 2019 is expected to be $0.39 per share, which represents an increase of 3% compared to cash dividends paid during 2018. Stockholders will have the opportunity to elect to receive the special dividend in the form of all cash or all stock, subject to proration if either option is oversubscribed.
Stockholders receiving such dividend and any future dividend payable in cash and shares of Aimco Common Sock will be required to include the full amount of such dividends as ordinary income to the extent of Aimco’s current and accumulated earnings and profits, as determined for United States federal income tax purposes for the year of such dividends, and may be required to pay income taxes with respect to such dividends in excess of the cash dividends received. With respect to certain non-United States stockholders, Aimco may be required to withhold United States tax with respect to such dividends, including in respect of all or a portion of such dividend that is payable in Common Stock.
The Board of Directors of the Aimco Operating Partnership’s general partner determines and declares distributions on OP Units. Aimco, through wholly-owned subsidiaries, is the general and special limited partner of and, as of December 31, 2018, owned a 94.3% ownership interest in the common partnership units of the Aimco Operating Partnership. The Aimco Operating Partnership holds all of Aimco’s assets and manages the daily operations of Aimco’s business. The distributions paid by the Aimco Operating Partnership to Aimco are used by Aimco to fund the dividends paid to its stockholders. Accordingly, the per share dividends Aimco pays to its stockholders generally equal the per unit distributions paid by the Aimco Operating Partnership to holders of its common partnership units.

In February 2019, the Board of Directors of the Aimco Operating Partnership’s general partner declared a special distribution on the common partnership units that consists of $71.5 million in cash and 4.8 million common partnership units. The special distribution will be payable on March 22, 2019, to unitholders of record as of February 22, 2019.
In order to neutralize the dilutive impact of the stock issued in the special dividend, Aimco’s Board of Directors also authorized a reverse stock split in which every 1.03119 share of Class A Common Stock will be combined into one share of Class A Common Stock, effective at the close of business on February 20, 2019. The Board of Directors of the Aimco Operating Partnership’s general partner authorized a corresponding reverse unit split to be effective concurrent with the Aimco reverse stock split. As a result, total shares and total units outstanding following completion of the transactions are expected to be unchanged from the total shares and units outstanding immediately prior to the transactions. Some stockholders may have more Aimco shares and some may have fewer based on their individual elections.
Our Credit Agreementrevolving credit agreement includes customary covenants, including a restriction on dividends and other restricted payments, but permits dividends and distributions during any four consecutive fiscal quarters in an aggregate amount of up to 95% of Aimco’s Funds From Operations for such period, subject to certain non-cash adjustments, or such amount as may be necessary to maintain Aimco’s REIT status.

18


Item 6. Selected Financial Data
The following selected financial data is based on audited historical financial statements of Aimco and the Aimco Operating Partnership. This information should be read in conjunction with such financial statements, including the notes thereto, and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included herein or in previous filings with the Securities and Exchange Commission.
For The Years Ended December 31,Years Ended December 31,
2015 2014 2013 2012 20112018 2017 2016 2015 2014
(dollar amounts in thousands, except per share data)(dollar amounts in thousands, except per share data)
OPERATING DATA:                  
Total revenues$981,310
 $984,363
 $974,053
 $958,511
 $914,355
$972,410
 $1,005,437
 $995,854
 $981,310
 $984,363
Income (loss) from continuing operations (1)91,390
 67,475
 34,596
 (18,756) (136,237)
Earnings (loss) per common share - basic and diluted:         
Income (loss) from continuing operations attributable to Aimco common stockholders$1.52
 $2.06
 $0.29
 $(0.60) $(1.22)
Net income716,603
 347,079
 483,273
 271,983
 356,111
Net income attributable to Aimco/the Aimco Operating Partnership per common share/unit – diluted$4.21
 $1.96
 $2.67
 $1.52
 $2.06
                  
BALANCE SHEET INFORMATION:                  
Total assets$6,144,194
 $6,097,028
 $6,079,413
 $6,401,380
 $6,871,862
$6,190,004
 $6,079,040
 $6,232,818
 $6,118,681
 $6,068,631
Total indebtedness3,873,160
 4,135,139
 4,388,185
 4,413,083
 4,488,822
4,075,665
 3,861,770
 3,648,206
 3,599,648
 3,852,885
Non-recourse property debt of partnerships served by Asset Management business
 227,141
 236,426
 249,493
 255,140
                  
OTHER INFORMATION:                  
Dividends declared per common share (2)$1.18
 $1.04
 $0.96
 $0.76
 $0.48
Dividends/distributions declared per common share/unit$1.52
 $1.44
 $1.32
 $1.18
 $1.04

(1)Effective January 1, 2014, we adopted ASU 2014-08, which revised the definition of a discontinued operation. In the selected financial data presentation above, the results of operations for apartment communities sold or classified as held for sale during 2015 and 2014 are reflected within income from continuing operations for all periods presented. The Aimco Operating Partnership's loss from continuing operations for the year ended December 31, 2011, was $134.4 million, which differed from Aimco due to interest income earned by the Aimco Operating Partnership on notes receivable from Aimco. The notes were repaid in late 2011 and the interest amounts were eliminated within Aimco's consolidated financial statements.
(2)The Aimco Operating Partnership’s distributions declared per common unit equaled the Aimco dividends declared per common share for the years ended December 31, 2012-2015. During the year ended December 31, 2011, the Aimco Operating Partnership's distributions per common included a $0.15 per unit special distribution.

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Table of Contents


Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations
Executive Overview
Aimco and the Aimco Operating Partnership
We are focused on the ownership, management, redevelopment and limited development of quality apartment communities located in several of the largest coastal and job growth markets in the United States.
Our principal financial objective is to provide predictable and attractive returns to our equity holders. We measure our long-term total return using Economic Income, defined as Net Asset Value, or NAV, growth plus dividends. NAV is used by many investors because the value of company assets can be readily estimated, even for non-earning assets such as land or properties under development. NAV has the advantage of incorporating the investment decisions of thousands of real estate investors, enhancing comparability among companies that have differences in their accounting, avoiding disparity that can result from application of GAAP to investment properties and various ownership structures. Some investors focus on multiples of Adjusted Funds From Operations, or AFFO, and Funds From Operations, or FFO. Our disclosure of AFFO, a measure of current return, complements our focus on Economic Income. We also use Pro forma Funds From Operations, or Pro forma FFO, as a secondary measure of operational performance. Over the last five years, our Economic Income grew at a compound annual return of 11.5%

as of September 30, 2018, comprised of a 8.5% compounded annual growth in net asset value, or NAV, per share and $6.36 in cash dividends per share paid over the period. In 2018, AFFO grew by 1.9% to $2.16 per share.
Our business and strategicfive areas of strategic focus are described in more detail within the Business Overview in Item 1. ExecutionThe results from execution of our goals within our strategic areas of focus drove good results for Aimcobusiness plan in 2015, summarized below.
In Property Operations, across our diversified conventional same store portfolio, new and renewal rent growth was 4.9% in 2015, higher than in 2014 by 50 basis points.
In Redevelopment, strong consumer demand for our redeveloped apartment homes drove: the lease up of Ocean House on Prospect in La Jolla, one quarter earlier than expected; absorption above seasonal expectations at Park Towne Place and The Sterling in Philadelphia; and second generation rent increases averaging 13% for our occupancy-stabilized redevelopments at Lincoln Place, Pacific Bay Vistas and Preserve at Marin.
In Portfolio Management, fourth quarter 2015 average revenue per apartment home was up 10% from fourth quarter 2014, reaching $1,840, a record high for Aimco.
On the Balance Sheet, at December 31, 2015, we had approximately $675 million of cash and restricted cash on-hand and credit available on our revolving credit facility. Leverage, as measured by the ratio of Debt plus Preferred Equity to Adjusted EBITDA (defined under the Non-GAAP Performance and Liquidity Measures heading), was down year-over-year by 11%.
Further information about the accomplishments in each of these strategic areas of focus is included2018 are further described in the sections that follow.
Property OperationsNet income attributable to common stockholders per common share increased by $2.25 for the year ended December 31, 2018, as compared to 2017, primarily due to gains on the sale of the Asset Management Business and lower-rated apartment communities.
For the year ended December 31, 2018, our NAV per share increased by about 6%, which, with our cash dividend, provided Economic Income of 8.5%.
Pro forma FFO per share increased $0.02, or 0.8%, for the year ended December 31, 2018, as compared to 2017 due to the following items:
$0.08 from Same Store property net operating income growth of 3.1%, driven by a 3.1% increase in revenue, offset by a 3.3% increase in expenses;
$0.16 net operating income contribution from redevelopment communities and lease-up communities; partially offset by
A reduction of $0.14 from apartment communities sold to fund our investment activities;
A reduction of $0.03 from the sale of the Asset Management business, net of the contribution from the reinvestment of the proceeds in 2018 acquisitions and repayment of debt;
A reduction of $0.05 from lower tax benefits and other items, net.
The $0.02 increase in year-over-year Pro forma FFO per share plus $0.02 in lower capital replacement spending due to fewer apartment homes increased AFFO by $0.04, or 1.9% per share.
Operational Excellence
We own and operate a diversified portfolio of conventionalmarket rate apartment communities.communities diversified by both geography and price point, which we refer to as our Real Estate portfolio. At December 31, 2015,2018, our conventionalReal Estate portfolio included 140134 apartment communities with 40,46436,549 apartment homes in which we held an average ownership of approximately 98%99%. We also operate aThis portfolio was divided about two-thirds by value to our “Same Store” portfolio of affordablestabilized apartment communities which consists of apartments with rents that are generally paid, in whole or part,and about one-third by a government agency. At December 31, 2015, our affordable portfolio consisted of 56 apartment communities with 8,685 apartment homes in which we held an average ownership of approximately 95%. Our conventional and affordable portfolios comprise our reportable segments and generated 90% and 10%, respectively, of our proportionate property net operating income (defined below under the Results of Operations –value to “Other Real Estate, Operations heading) during” which includes recently acquired communities and communities under redevelopment or development whose long-term financial contribution is not yet stabilized.
Our property operations team produced solid results for our Real Estate portfolio for the year ended December 31, 2015.2018. Highlights include:
Average daily occupancy of 96.5%, 50 basis points higher than the year ended 2017;
Same Store net operating income increased 3.1% with 74.2% net operating income margin; and
Same Store rent increases on renewals and new leases averaged 4.5% and 1.5%, respectively, for a weighted average increase of 3.0%.
Our focus on efficient operations through productivity initiatives such as centralization of administrative tasks, optimization of economies of scale at the corporate level, and investment in more durable, longer-lived materials has helped us control operating expenses. These and other innovations contributed to limiting growth in controllable operating expense (defined as property expenses less taxes, insurance and utility expenses) compounding for the past decade at an annual rate of 0.1%.
For the year ended December 31, 2015,2018, our conventionalReal Estate portfolio provided 67%72% net operating income margins and 60% free cash flow67% Free Cash Flow margins. Free cash flow and average revenue per effective apartment home are both defined under the Non-GAAP Performance and Liquidity Measures heading.
Redevelopment
Our second line of business is the redevelopment and Developmentlimited development of apartment communities. Through these activities, we expect to create value by repositioning communities within our portfolio. We measure the rate and quality of financial returns by NAV creation, an important component of Economic Income, our primary measure of long-term financial performance. Over the past five years, we have spent approximately $1.0 billion on redevelopment and development, resulting in estimated value creation of approximately $400.0 million. We also undertake limited ground-up development when warranted by risk-adjusted

investment returns, either directly or in connection with the redevelopment of an existing apartment community. When warranted, we rely on the expertise and credit of a third-party developer familiar with the local market to limit our exposure to construction risk.
We invest to earn risk-adjusted returns in excess of those expected from the apartment communities sold in paired trades to fund the redevelopment or development. Of these two activities, we favor redevelopment because it permits adjustment to the scope and timing of spending to align with changing market conditions and customer preferences.
During the year ended December 31, 2015,2018, we invested approximately $118$175.9 million in redevelopment projects, enhancing seven communities withand development.
In Boulder, Colorado, we have invested $68.9 million in the development of Parc Mosaic, a total226-unit apartment home community. The site is two miles from the new Google campus and is across the street from Ball Aerospace’s Technology Campus and Foothills Hospital. Building in Boulder is highly regulated and new supply is limited, notwithstanding higher enrollment at the University of more than 2,500Colorado and increased employment generally.
At the University of Colorado Anschutz Medical Campus, we exercised our option to acquire approximately two acres of land adjacent to our 21 Fitzsimons apartment homes. Duringcommunity, and broke ground on the year, we completed construction ondevelopment of The Fremont, a 253-apartment home community. We expect to invest approximately $87.0 million to construct the community, which is expected to be ready for occupancy in late 2020.
We also commenced the next phase of redevelopment at our multi-year redevelopments at Lincoln Place,Flamingo community, located in Venice, California, and Preserve at Marin, located in Marin County, California. We also completed construction at 2900 on First, in Seattle, Washington, and Ocean House on Prospect, located in La Jolla, California. During the year, we also continued the phasedMiami Beach, bringing our potential net investment to $39.7 million. This phase includes extensive redevelopment of tworetail, leasing, and common areas, including major enhancements to the entryway.
In Center City, Philadelphia, Pennsylvania communities,we completed the redevelopment of Park Towne Place, and The Sterling.
At Park Towne Place, 2015 saw the near completionas of the redevelopment of one of the four towers that comprise the community, as well as the town center. At the end of January 2016,December 31, 2018, we had leased 83% of the completed apartment homes in this tower, with rents above underwriting, and we have now completed construction of the remaining apartment homes in this tower. Based on these successful results, we approved a plan during 2015 to redevelop a second tower at Park Towne Place with 245 apartment homes. We began de-leasing this tower during the fourth quarter and construction is underway. We anticipate construction completion for the second tower in the fourth quarter of 2016. By the end of January 2016, we had signed leases for 55% of the 12,560 square feet of commercial space in the community, at rents above underwriting.
At The Sterling, during 2015, we completed renovation of the common areas and retail space, at a cost consistent with underwriting. Based on the success of the lease-up pace and pricing95.6% of the apartment homes that have been completed, inat the fourth quarter 2015, we approved a plan to expand the phasedcommunity. This multi-year redevelopment of The Sterling940 apartment homes, amenities, and common area spaces, was executed on plan and leased-up in-line with another five floors containing

20

Tableexpectations with expected free cash flow returns of Contentsgreater than 9%.

130 apartment homes. ByIn San Jose, California we completed the endredevelopment of January 2016, 62%Saybrook Pointe, a 324-apartment home, garden-style community. Construction was completed on time and in-line with underwritten costs, and lease-up of the 409community finished ahead of schedule and at rates above underwriting, increasing the expected free cash flow return to greater than 14%, a 100 basis point outperformance to underwriting.
As of December 31, 2018, our total estimated net investment in redevelopment and development activities is $571.2 million, with a projected weighted average net operating income yield on these investments of 6.1%, assuming untrended rents. As of December 31, 2018, $361.0 million of this total has been funded.
During the year ended December 31, 2018, we leased 457 apartment homes approved forat our redevelopment and development communities. At December 31, 2018, our exposure to lease-up at active redevelopment and development communities was approximately 366 apartment homes, of which 208 were complete,being constructed at a cost consistent with underwriting,Parc Mosaic, and 158 were located in four other communities. Additionally, we had leased 97%expect to acquire One Ardmore in 2019 upon its completion as part of the completed apartment homes, with rents above underwriting. We had also signed leases for 84% of the 19,845 square feet of retail space at rents above underwriting.
During 2015, we also invested a total of $116 million in development, about $100 million of which was in our One Canal property in Boston. We expect completion of construction for One CanalPhiladelphia portfolio acquisition announced in April 2016 and we are pre-leasing now. We also invested $16 million in the completion of Vivo, a community we acquired in Cambridge mid-year while under construction. We saw2018. This acquisition will increase our first move-ins at Vivo in October and at the end of January 2016, the community was 48% leased at rents above underwriting.exposure to lease-up risk by approximately 100 apartment homes.
See below under the Liquidity and Capital Resources – Redevelopment and Redevelopment/Development heading for additional information regarding our ongoing redevelopment and development projects atinvestment during the year ended December 31, 2015.2018.
Portfolio Management
AverageOur portfolio of apartment communities is diversified across “A,” “B,” and “C+” price points, averaging “B/B+” in quality and is diversified across several of the largest markets in the U.S. We measure the quality of apartment communities in our Real Estate portfolio based on average rents of our apartment homes compared to local market average rents as reported by a third-party provider of commercial real estate performance and analysis. Under this rating system, we classify as “A” quality apartment communities those earning rents greater than 125% of the local market average; as “B” quality apartment communities those earning rents between 90% and 125% of the local market average; as “C+” quality apartment communities those earning rents greater than $1,100 per month, but lower than 90% of local market average; and as “C” quality apartment communities those earning rents less than $1,100 per month and lower than 90% of local market average. We classify as “B/B+” quality a portfolio that on average earns rents between 100% and 125% of the local market average rents where the portfolio is located. Although some companies and analysts within the multifamily real estate industry use apartment community quality ratings of “A,” “B,” and “C,” some of which are tied to local market rent averages, the metrics used to classify apartment community quality as well as the period for which local market rents are calculated may vary from company to company. Accordingly, our rating system for measuring apartment community quality is neither broadly nor consistently used in the multifamily real estate industry.

As part of our portfolio strategy, we seek to sell up to 10% of our portfolio annually and to reinvest the proceeds from such sales in accretive uses such as capital enhancements, redevelopments, limited developments and selective acquisitions with projected Free Cash Flow internal rates of return higher than expected from the communities being sold. Through this disciplined approach to capital recycling, we have significantly increased the quality and expected growth rate of our portfolio.
 Three Months Ended
 December 31,
 2018 2015
Average Revenue per Aimco apartment home (1)$2,126
 $1,771
Portfolio Average Rents as a Percentage of Local Market Average Rents113% 111%
Percentage A (4Q 2018 Average Revenue per Aimco Apartment Home $2,786)51% 51%
Percentage B (4Q 2018 Average Revenue per Aimco Apartment Home $1,850)33% 32%
Percentage C+ (4Q 2018 Average Revenue per Aimco Apartment Home $1,706)16% 17%
(1) Represents average monthly rental and other property revenues (excluding resident reimbursement of utility cost) divided by the number of occupied apartment homes as of the end of the period.
The quality of our portfolio improved through value created by our redevelopment and transaction activities, contributing to the increase in average revenue per effectiveapartment home. Our average revenue per apartment home for our conventional portfolio increased by 10%, from $1,669was $2,126 for the three months ended December 31, 2014,2018, a 6.4% compounded annual growth rate compared to $1,840 for the three months ended December 31, 2015,2015. This increase is due to growth in Same Store revenue as a resultwell as our acquisition activities, lease-up of year-over-year revenue growth of 4.5% for our conventional same store apartmentredevelopment and acquisition communities, and the sale of conventional apartment communities during 2015 with average revenues per home lower than the apartment communities in our retained portfolio and the reinvestment of the sales proceeds through redevelopment and acquisition of apartment communities with better prospects and higher rents.
In total, we sold 11 apartment communities with 3,855 apartment homes during the year ended December 31, 2015. These sales represented roughly 4% of our beginning of year real estate asset value. Eight of these communities were from our conventional portfolio, with average monthly revenues per apartment home of $1,043, 43% below the average of our retained conventional portfolio. Among the properties sold, was the last one we held in Phoenix. We also continued the sell-down of our affordable portfolio with the sale of three communities.
Consistent with our paired-trade discipline, proceeds from these sales were reinvested in redevelopment and development projects described above, acquisitions, and property upgrades with a weighted average Free Cash Flow internal rate of return (defined under the Non-GAAP Performance and Liquidity Measures heading) approximately 350 basis points higherlower than the communities sold to fund them.
In addition to our acquisitionthose of the under construction community, Vivo, which is described under the Redevelopment and Development heading above, during 2015, we purchased two other communities: Mezzo, an operating community in Atlanta; and Axiom, a lease-up community in Cambridge. Our total purchase price for these three communities was $129 million.
At the end of January 2016, Axiom was 89% leased at rents above underwriting. We expect to reach occupancy stabilization on this community during the second quarter of 2016.
In addition to the acquisitions of these three communities, during the year we entered into a contract to acquire an apartment community currently under construction in Northern California for $320 million.  The acquisition is expected to close upon completion of construction in the summer of 2016. We intend to fund the acquisition through a ten-year property loan, with the balance funded primarily by proceeds from the sale of two apartment communities: one in Alexandra, Virginia; and our last community in Phoenix, which sale closed in December 2015.
Through our disciplined execution of our portfolio management strategy, over the three year period from December 31, 2012 to December 31, 2015, we:
increased our period-end conventional portfolio average revenue per apartment home by 35% to $1,840. This rate of growth reflects the impact of market rent growth, and more significantly, the impact of portfolio management through dispositions, redevelopment and acquisitions;
increased our conventional portfolio Free Cash Flow margin by 9% through the sale of lower-rated communities and reinvestment in communities of greater quality commanding higher rents; and
increased to 91% the percentage of our conventional property net operating income earned in our target markets.
As a result of these efforts, as of September 30, 2015, the most recent period for which market information is available, approximately 51%, 32% and 17% of Aimco's portfolio is invested in “A,” “B” and “C+” quality apartment homes, respectively, as measured under our portfolio quality rating system discussed in the Portfolio Management heading in Item 1.retained portfolio.
As we continue to execute our portfolio strategy, we expect to continue to increase conventional portfolio average revenue per Aimco apartment home at a rate greater than market rent growth; to increase further Free Cash Flow margins; and maintain sufficient geographic and price point diversification to selllimit volatility and concentration risk.
Apartment Community Acquisitions
We evaluate potential acquisitions with an eye for unique and opportunistic investments, and fund acquisitions pursuant to our lower rated“paired trade” discipline.

21

TableDuring the year ended December 31, 2018, we acquired six apartment communities. We acquired for $307.9 million four apartment communities in the Philadelphia area including 665 apartment homes and 153,000 square feet of Contentsoffice and retail space. We also acquired for $160.0 million Bent Tree Apartments, a 748-apartment home community in Fairfax County, Virginia, and for $29.7 million Avery Row, a 67-apartment home community in Arlington, Virginia.
In addition to the four communities in Philadelphia that were acquired in 2018, we also agreed last year to purchase a fifth community, One Ardmore, upon completion of its construction in the first half of 2019.

Dispositions
During the year ended December 31, 2018, we sold for $590.0 million our Asset Management business and four affordable apartment communities;communities located in the Hunters Point area of San Francisco. After payment of transaction costs and repayment of property-level debt encumbering the Hunters Point apartment communities, net proceeds to increaseus were $512.2 million.
During the year ended December 31, 2018, we also sold for $242.3 million four apartment communities with 1,334 apartment homes, which were previously included in our Real Estate segment. Net proceeds to 95% or moreus were $230.1 million. Two of these apartment communities were located in southern Virginia, one was located in suburban Maryland, and one was located in northern Philadelphia.
During the percentageyear ended December 31, 2018, we sold our interests in the entities owning the La Jolla Cove property in settlement of legal actions filed in 2014 by a group of disappointed buyers who had hoped to acquire the property. We provided seller financing with a stated value of $48.6 million and received net cash proceeds of approximately $5.0 million upon the sale.
In January 2019, we sold two apartment communities with 782 apartment homes for gross proceeds of $141.2 million. One community was located in Schaumberg, Illinois and the other located in Virginia Beach, Virginia.
Proceeds from the 2018 and 2019 sales were used to fund accretive investments in community acquisitions, capital enhancements, redevelopments and share repurchases, representing continued execution of our conventional property net operating income earnedpaired trade strategy. This reallocation of $1.1 billion in our target markets.capital increased expected Free Cash Flow internal rates of return by 420 basis points.

Balance Sheet and Liquidity
Leverage
Our leverage strategy seeks to increase financial returns while using leverage with appropriate caution. We limit risk through balance sheet structure, employing low leverage, primarily non-recourse and long-dated property debt; build financial flexibility by maintaining ample unused and available credit as well as holding properties with substantial value unencumbered by property debt; and use partners’ capital when it enhances financial returns or reduces investment risk.
Our leverage includes our share of long-term, non-recourse property debt encumbering apartment communities, outstanding borrowings on the revolving credit facility and outstanding preferred equity. For additional information regarding our leverage, please see the discussion under the Liquidity and Capital Resources heading.
Leverage Ratios
We target the ratio of Proportionate Debt plusand Preferred Equity to Adjusted EBITDA to be below 7.0x and we target the ratio of Adjusted EBITDA Coverage ofto Adjusted Interest Expense and Preferred Dividends to be greater than 2.5x. Our leverage ratios for the three months ended December 31, 2018, are presented below:
Proportionate Debt to Adjusted EBITDA6.8x
Proportionate Debt and Preferred Equity to Adjusted EBITDA7.2x
Adjusted EBITDA to Adjusted Interest Expense3.8x
Adjusted EBITDA to Adjusted Interest Expense and Preferred Dividends3.4x
Our Adjusted EBITDA has been calculated on a pro forma basis to adjust for significant items impacting the three months ended December 31, 2018 for which annualization would distort the results. Leverage ratios are elevated by 0.5x due to the use of debt to fund temporarily the Aimco common share repurchases completed during the three months ended December 31, 2018. We also focus on the ratios ofintend to reduce our Proportionate Debt and Preferred Equity to Adjusted EBITDA to 6.9x by the end of 2019 from earnings growth, primarily due to increasing contribution from Same Store apartment communities and Adjusted EBITDA Coveragereduction of Interest. Proportionate Debt, Adjusted EBITDAdebt balances due to regularly-scheduled debt amortization and Adjusted Interest, asapartment community sales, partially offset by the loss of earnings from communities sold. As used in thesethe ratios are non-GAAP financial measures, which are further discussed and reconciled under the Non-GAAP Performance and Liquidity Measures - Leverage Ratios heading.above, Preferred Equity represents Aimco'sAimco’s preferred stock and the Aimco Operating Partnership'sPartnership’s preferred OP units.
Our leverage ratios forRefinancing Activity
During the trailing twelve month periodsyear ended December 31, 20152018, we addressed approximately half of our property loans maturing in 2019, 2020, and 2014, are presented below:2021. We placed $867.4 million of new loans, $740.4 million of fixed-rate loans at a weighted average interest rate of 4.20% and a weighted average term of 9.3 years, and $127.0 million of variable-rate loans with rates floating at 115 basis points over 30-day LIBOR and a weighted average term of 5.1 years. This refinancing activity results in an annual interest savings of $13.0 million.
Liquidity
 Trailing Twelve Months Ended December 31, Pro-forma Trailing Twelve Months Ended December 31,
 2015 2014 2014 (1)
Proportionate Debt to Adjusted EBITDA6.4x 7.1x 6.5x
Proportionate Debt plus Preferred Equity to Adjusted EBITDA6.8x 7.6x 7.0x
Adjusted EBITDA to Adjusted Interest3.1x 2.7x 2.9x
Adjusted EBITDA to Adjusted Interest and Preferred Dividends2.8x 2.5x 2.7x
(1)During January 2015, Aimco completed a Common Stock offering resulting in net proceeds of approximately $367Our liquidity consists of cash balances and available capacity on our revolving line of credit. During the year ended December 31, 2018, we exercised our option to expand our revolving credit facility by $200.0 million, bringing the total borrowing capacity to $800.0 million. The pro-forma ratios presented for the trailing twelve months ended December 31, 2014, have been adjusted to reflect the following: a) Repayment of $112.3 million of outstanding borrowings under our Credit Agreement at December 31, 2014; b) Repayment of $102.2 million of property debt; c) Redemption of $27.0 million of Aimco’s CRA Preferred Stock; and d) Investment of the remaining proceeds from the common offering. Refer to Note 9 to the consolidated financial statements in Item 8 for additional information regarding this stock offering.
We expect future leverage reduction from both earnings growth, especially as apartment communities now being redeveloped or developed are completed and leased, and from regularly scheduled property debt amortization repaid from operating cash flows. As of December 31, 2015,2018, we had cash and restricted cash of $72.6 million and had the capacity to borrow up to $632.5 million on our revolving credit facility, after consideration of $7.1 million letters of credit backed by the facility. We use our credit facility primarily for working capital and other short-term purposes and to secure letters of credit.
We manage our financial flexibility by maintaining an unencumbered pool that included 25 consolidatedinvestment grade rating and holding apartment communities and hadthat are unencumbered by property debt. At December 31, 2018, we held unencumbered apartment communities with an estimated fair market value of approximately $1.8 billion.$2.7 billion, up 50% from December 31, 2017.
Two credit rating agencies rate our creditworthiness, using different methodologies and ratios for assessing our credit. In 2015,credit, and both of these agencies upgradedhave rated our credit rating and outlook toas BBB- (stable), an investment grade rating. In addition to lowering the cost of borrowings under our line of credit, an improvement to an investment grade rating may lower the cost of any future preferred equity issuance, provide additional flexibility for sources of capital, and provide other intangible benefits. Although some of the ratios they use are similar to those we use to measure our leverage, there are differences in our methods of calculation and therefore our leverage ratios disclosed above are not indicative of the ratios that may be calculated by these agencies. While an investment grade rating provides

Equity Capital Activities
During the year ended December 31, 2018, we repurchased 8.7 million shares of common stock, of which 0.5 million settled in January 2019, all for ready access$394.1 million, at a weighted average price of $45.33 per share, approximately a 20% discount to our published NAV per share. Approximately half of the repurchases were funded with proceeds from 2018 and January 2019 property sales at a premium to the issuancevalues ascribed to these communities in our published NAV. The remaining half of corporate debt,repurchases are temporarily funded with borrowings on our credit facility. We expect to repay these borrowings with proceeds from the sale of communities now under contract, again at prices greater than those used in our published NAV. With the completion of these transactions, we do not anticipate doing so.will have increased NAV by an estimated $0.67 per share.
At December 31, 2015, we had $675The 2019 property sales necessary to fund our share repurchases are expected to generate taxable gains of $285 million, which is in excess of our regular quarterly dividend. Accordingly, on February 3, 2019, Aimco’s Board of Directors declared a special dividend on the common stock that consists of $67.1 million in cash and restricted4.5 million shares of common stock. The special dividend will be payable on March 22, 2019, to stockholders of record as of February 22, 2019. The special dividend also includes the regular quarterly cash dividend, which for 2019 is expected to be $0.39 per share, which represents an increase of 3% compared to cash dividends paid during 2018.
Stockholders will have the opportunity to elect to receive the special dividend in the form of all cash or all stock, subject to proration if either option is oversubscribed. Based on handAimco’s closing share price on February 15, 2019, we estimate the aggregate value of the special dividend to be approximately $290.3 million. However, the actual value will vary depending on the price of Aimco common stock on the dividend valuation dates (March 11 and credit available12, 2019).
In order to neutralize the dilutive impact of the stock issued in the special dividend, Aimco’s Board also authorized a reverse stock split, effective on our Senior Secured Credit Agreement.February 20, 2019. As a result, total shares outstanding following completion of both the special dividend and the reverse stock split are expected to be unchanged from the total shares outstanding immediately prior to the transactions. Some stockholders may have more Aimco shares and some may have fewer based on their individual elections. The reverse split will facilitate comparability of Aimco per share results before and after these transactions.
In aggregate, these transactions:
Increase NAV per share by 1%;
Do not affect Aimco’s regular quarterly cash dividend;
Reduce the number of Aimco shares outstanding by 6% (as a result of the share repurchases);
Minimize the aggregate tax paid by Aimco and its stockholders;
Are leverage neutral; and
Result in no change in the number of shares outstanding (as a result of the special dividend and the reverse stock split), thereby improving comparability of per share results.
Team and Culture
Our team and culture is the keyare keys to our success. Our emphasisintentional focus on a collaborative respectful, and performance-orientedproductive culture based on respect for others and personal responsibility is what enablesreinforced by a preference for promotion from within based on succession planning and talent development to produce a strong, stable team that is the continuing transformationenduring foundation of the Aimco business.our success. In 2015, Aimco was2018, we were recognized by the Denver Post as a Top Work Place for the thirdsixth consecutive year.year, an accomplishment shared with only seven other companies in Colorado.
Key Financial Indicators
KeyThe key financial indicators that we use in managing our business and in evaluating our financial condition and operating performance include:are Economic Income, Net Asset Valueour measure of long-term total return, and Adjusted Funds From Operations.AFFO, our measure of current return. In addition to these indicators, we also use Pro forma Funds From Operations; Free Cash Flow, Free Cash Flow internal rate of return, Free Cash Flow capitalization rate, net operating income, or NOI, capitalization rate, same store property operating results, proportionate property net operating income, average revenue per effective apartment home, financial coverage ratios, and leverage as shown on our balance sheet to evaluate our operating performance and financial condition. Most of these financial indicators are non-GAAP financial measures, which are defined, further describedcondition using: Pro forma FFO; Free Cash Flow; Same Store property net operating income; proportionate property net operating income; average revenue per effective apartment home; leverage ratios; and for certain of the measures, reconciled to comparable GAAP-based measures, under the Non-GAAP Performance and Liquidity Measures heading.net leverage.

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Results of Operations
Because our operating results depend primarily on income from our apartment communities, the supply of and demand for apartments influences our operating results. Additionally, the level of expenses required to operate and maintain our apartment communities and the pace and price at which we redevelop, acquire and dispose of our apartment communities affect our operating results.
The following discussion and analysis of the results of our operations and financial condition should be read in conjunction with the accompanying consolidated financial statements in Item 8.
Overview
20152018 compared to 20142017
Net income attributable to Aimco and net income attributable to the Aimco Operating Partnership increased by $350.5 million and $370.4 million, respectively, for the year ended December 31, 2018 as compared to 2017. The increase in income was primarily due to an increase in gain on dispositions of real estate, including the 2018 sale of our Asset Management business, and results of operations described more fully below, partially offset by an increase in depreciation and amortization resulting from redeveloped and developed apartment homes placed into service.

2017 compared to2016
Net income attributable to Aimco and net income attributable to the Aimco Operating Partnership decreased by $60.5$114.6 million and $64.3$120.0 million, respectively, duringfor the year ended December 31, 2015,2017 as compared to the year ended December 31, 2014.2016. The decrease in income was principally due to a decrease in gainsgain on dispositions of real estate and an increase in depreciation and amortization resulting from redeveloped apartment homes placed into service and the completion of One Canal and the acquisition of Indigo in 2016, partially offset by the effect of various other items further discussed below.

2014 compared to2013
Net income attributable to Aimco and net income attributable to the Aimco Operating Partnership increased by $102.0 million and $106.2 million, respectively, during the year ended December 31, 2014, as compared to the year ended December 31, 2013. The increase in income was principally due to an increase in gains on dispositions and a decrease in interest expense.improved operating results.
The following paragraphs discuss these and other items affecting the results of operations of Aimco and the Aimco Operating Partnership in more detail.
Property Operations
As described under the preceding Executive Overview heading, our owned real estate portfoliowe have a single reportable segment, Real Estate, which consists primarily of conventionalmarket rate apartment communities andin which we also operatehold a portfolio of affordable apartment communities. Our conventional and affordable real estate operations comprise our reportable segments.substantial equity ownership interest.
Due to the diversity of our economic ownership interests in our apartment communities, our chief executive officer, who is our chief operating decision maker, usesWe use proportionate property net operating income to assess the operating performance of our apartment communities.Real Estate portfolio. Proportionate property net operating income reflects our share of rental and other property revenues, excluding resident utility reimbursement, less direct property operating expenses, net of resident utility reimbursement, and including real estate taxes, for the consolidated and unconsolidated apartment communities that we own and manage. Accordingly, the results of operations of our conventional and affordable segmentsReal Estate segment discussed below are presented on a proportionate basis and exclude the results of four conventional apartment communities with 142 apartment homes and nine affordable apartment communities with 779 apartment homes that we do not manage.neither manage nor consolidate. Beginning in 2018, our segment results below reflect utility reimbursements as a reduction of the corresponding expense. We have revised the 2017 and 2016 amounts to conform to this presentation.
We do not include property management revenues, offsite costs associated with property management or casualty-related amounts in our assessment of segment performance. Accordingly, these items are not allocated to our segment results discussed below.
Refer to Note 1512 into the consolidated financial statements in Item 8 for further discussion regarding our reportable segments,segment, including a reconciliation of these proportionate amounts to consolidated rental and other property revenues and property operating expenses.
Conventional Real Estate OperationsProportionate Property Net Operating Income
Our conventional segment consists ofWe classify apartment communities we classifywithin our Real Estate segment as Conventional Same Store Conventional Redevelopment and Development, Conventional Acquisition and Other Conventional apartment communities. ConventionalReal Estate. Same Store apartment communities are those we manage, that have reached a stabilized level of operations as of the beginning of a two-year comparable period and maintained a stabilized occupancy (greater than 90%) duringit throughout the current year and comparable prior year, periods, and that are not expected to be sold within 12 months. Conventional Redevelopment and DevelopmentOther Real Estate includes apartment communities that do not meet the Same Store definition, including, but not limited to: redevelopment and development apartment communities, which are those in whichcurrently under construction that have not achieved a substantial numberstabilized level of available apartment homesoperations and those that have been vacated for major renovations orcompleted in recent years that have not beenachieved and maintained stabilized in occupancy duringoperations for both the current year orand comparable prior year periods, due to ongoing or completed renovations, such as exteriors, common areas oryear; acquisition apartment home improvements, as well as those being constructed from the ground up. Conventional Acquisition apartment communities, which are those we have acquired since January 1, 2014. Other Conventional apartmentthe beginning of a two-year comparable period; and communities includes conventional apartment communities that have significant rent control restrictions; apartment communities that had not reached and maintained a stabilized level of occupancy during the current year or prior year periods, often due to a casualty event; the operations of properties that are not multifamily, such as fitness centers; and those

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apartment communities we expect to sell in the next 12 months, but that have not yet met the criteria to be classified as held for sale.
As of December 31, 2015, as defined by our segment performance metrics, our conventional portfolio consisted of the following:
107 Conventional Same Store apartment communities with 33,149 apartment homes;
nine Conventional Redevelopment and Development apartment communities with 3,301 apartment homes;
eight Conventional Acquisition apartment communities with 1,391 apartment homes; and
11 Other Conventional apartment communities with 2,385 apartment homes.
From December 31, 2014, to December 31, 2015, on a net basis, our Conventional Same Store portfolio increased by four apartment communities and decreased by 3,571 apartment homes. This change consisted of:
two apartment communities with 83 apartment homes that were reclassified from our Conventional Acquisition portfolio after being owned by Aimco for both periods;
one apartment community with 488 apartment homes that was reclassified from our Other Conventional portfolio upon maintaining stabilized occupancy following increased vacancy associated with the termination of corporate housing leases; and
eight New York apartment communities with 230 apartment homes that were reclassified from our Other Conventional portfolio upon determination that the prospective rental rates for these communities are expected to be more comparable to market rental rate growth in that market, independent of government regulation.
These increases were offset by the removal of six apartment communities with 3,150 apartment homes that were sold during the period and one apartment community with 1,222 apartment homes that is expected to be sold within 12 months but doesdo not yet meet the criteria to be classified as held for sale.

As of December 31, 2018, our Real Estate segment consisted of 93 Same Store communities with 25,905 apartment homes and 35 Other Real Estate communities with 9,720 apartment homes.
From December 31, 2017 to December 31, 2018, on a net basis, our Same Store portfolio increased by one community and decreased by 481 apartment homes. These changes consisted of:
the addition of one developed apartment community with 91 apartment homes and one redeveloped apartment community with 104 apartment homes that were classified as Same Store upon maintaining stabilized operations for the entirety of the periods presented;
the addition of one acquired apartment community with 115 apartment homes that was classified as Same Store because we have now owned it for the entirety of the periods presented;
the addition of one apartment community with 492 apartment homes which we no longer expect to sell within 12 months;
the reduction of one apartment community with 821 apartment homes sold during the period;
the reduction of one apartment community with 94 apartment homes we expect to sell during 2019; and
the reduction of one apartment community with 368 apartment homes classified as held for sale at December 31, 2018.
As of December 31, 2018, our Other Real Estate communities included:
13 apartment communities with 6,294 apartment homes in accordanceredevelopment or development;
7 apartment communities with GAAP.1,943 apartment homes recently acquired; and
15 apartment communities with 1,483 apartment homes that do not meet the definition of Same Store because they are either subject to agreements that limit the amount by which we may increase rents or have not reached or maintained a stabilized level of occupancy as of the beginning of a two-year comparable period, often due to a casualty event.
Our conventional portfolioReal Estate segment results for the years ended December 31, 20152018 and 2014,2017, as presented below, are based on the apartment community populationsclassifications as of December 31, 2015.2018.
 Year Ended December 31,
(in thousands)2015 2014 $ Change % Change
Rental and other property revenues:       
Conventional Same Store$646,693
 $618,990
 $27,703
 4.5%
Conventional Redevelopment and Development69,186
 51,452
 17,734
 34.5%
Conventional Acquisition27,003
 4,555
 22,448
 492.8%
Other Conventional55,439
 54,660
 779
 1.4%
Total798,321
 729,657
 68,664
 9.4%
Property operating expenses:       
Conventional Same Store203,603
 199,463
 4,140
 2.1%
Conventional Redevelopment and Development24,943
 20,579
 4,364
 21.2%
Conventional Acquisition10,759
 1,692
 9,067
 535.9%
Other Conventional24,268
 23,530
 738
 3.1%
Total263,573
 245,264
 18,309
 7.5%
Property net operating income:       
Conventional Same Store443,090
 419,527
 23,563
 5.6%
Conventional Redevelopment and Development44,243
 30,873
 13,370
 43.3%
Conventional Acquisition16,244
 2,863
 13,381
 467.4%
Other Conventional31,171
 31,130
 41
 0.1%
Total$534,748
 $484,393
 $50,355
 10.4%
 Year Ended December 31,
(in thousands)2018 2017 $ Change % Change
Rental and other property revenues before utility reimbursements:       
Same Store communities$580,536
 $563,040
 $17,496
 3.1%
Other Real Estate communities273,704
 218,154
 55,550
 25.5%
Total854,240
 781,194
 73,046
 9.4%
Property operating expenses, net of utility reimbursements:       
Same Store communities150,042
 145,301
 4,741
 3.3%
Other Real Estate communities88,818
 77,430
 11,388
 14.7%
Total238,860
 222,731
 16,129
 7.2%
Proportionate property net operating income:       
Same Store communities430,494
 417,739
 12,755
 3.1%
Other Real Estate communities184,886
 140,724
 44,162
 31.4%
Total$615,380
 $558,463
 $56,917
 10.2%
For the year ended December 31, 2015, as2018 compared to 2014,2017, our conventionalReal Estate segment’s proportionate property net operating income increased $50.4$56.9 million, or 10.4%10.2%.
For the year ended December 31, 2015, as compared to 2014, Conventional Same Store proportionate property net operating income increased by $23.6$12.8 million, or 5.6%3.1%. This increase was primarily attributable to a $27.7$17.5 million, or 4.5%3.1%, increase in rental

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and other property revenues due to higher average monthly revenues (approximately $75of $50 per effective home),Aimco apartment home comprised of increases in rental rates utility reimbursements and other fees including parking. Rental rates on new leases transacted duringa 50 basis point increase in average daily occupancy. Renewal rents, which is the rent paid by an existing resident who renewed a lease compared to the rent paid prior to renewal, were up 4.5% for the year ended December 31, 20152018, and new lease rents, which is the rent paid by a new resident compared to the rent paid by the previous resident of the same apartment home, were up 1.5%, were 4.4% higher than expiring lease rates, and renewal rates were 5.5% higher than expiring lease rates.resulting in a weighted average increase of 3.0%. The increase in Conventional Same Store rental and other property revenues was partially offset by a $4.1$4.7 million, or 2.1%3.3%, increase in property operating expenses, primarily due to increases in real estate taxes and repairs and maintenance.maintenance costs. During the year ended

December 31, 2015, as2018 compared to 2014,2017, controllable operating expenses, which exclude utility costs, real estate taxes and insurance, increased by $2.2$1.5 million, or 2.4%2.0%.
Our Conventional Redevelopment and DevelopmentThe proportionate property net operating income of Other Real Estate communities increased by $13.4$44.2 million, duringor 31.4%, for the year ended December 31, 2015, as2018 compared to 2014,2017 primarily due to increases in net operating income associated with higher revenues per occupied home and higher average daily occupancy associated with apartment homes placed into service following completion of construction activities. During 2015, as compared to 2014, average daily occupancy associated with our Lincoln Place, The Preserve at Marin and Pacific Bay Vistas redevelopment communities increased by 440 basis points, 560 basis points and 200 basis points, to 90%, 79% and 95%, respectively. Additionally, these communities generated significant increases in average revenue per apartment home as construction on these projects was completed. These communities contributed anto:
a $24.1 million increase in property net operating income due to the 2018 acquisition of $16.9the four Philadelphia communities, Bent Tree Apartments and Avery Row, as well as the stabilization of Indigo;
an $11.0 million from 2014 to 2015. This increase in property net operating income contribution wasdue to leasing activities at redevelopment and development communities, partially offset by a reduction in revenue associated with approximately 375decreases due to apartment homes taken out of service at our Park Towne Placefor redevelopment; and The Sterling redevelopments.
Our Conventional Acquisition proportionatehigher property net operating income of $9.1 million from other communities, primarily the effect of our increased by $13.4 million duringownership interest in the year endedPalazzo communities from our June 2017 reacquisition of a 47% limited partner interest in the related joint venture.
As of December 31, 2015,2017, as compared to 2014, due to apartment communities we acquired during 2015 and 2014.
As of December 31, 2014,defined by our conventionalsegment performance metrics, our Real Estate portfolio consisted of the following:
98 Conventional90 Same Store apartment communities with 34,05825,197 apartment homes;homes and 32 Other Real Estate communities with 8,845 apartment homes.
seven Conventional RedevelopmentAs of December 31, 2017, our Other Real Estate communities included:
15 apartment communities with 2,8916,386 apartment homes;homes in redevelopment or development;
eight Conventional Acquisition2 apartment communities with 1,256578 apartment homes;homes recently acquired; and
18 Other Conventional15 apartment communities with 1,3531,881 apartment homes.homes that do not meet the definition of Same Store because they are either subject to agreements that limit the amount by which we may increase rents or have not reached or maintained a stabilized level of occupancy as of the beginning of a two-year comparable period, often due to a casualty event.
Our conventional portfolioReal Estate segment results for the years ended December 31, 20142017 and 2013,2016, as presented below, are based on the apartment community populationsclassifications as of December 31, 2014 (excluding2017, and exclude amounts related to apartment communities sold or classified as held for sale during 2015).2018. The results of operations for these communities are reflected in the comparable periods in the tables below.
 Year Ended December 31,
(in thousands)2014 2013 $ Change % Change
Rental and other property revenues:       
Conventional Same Store$630,175
 $603,654
 $26,521
 4.4%
Conventional Redevelopment51,452
 35,768
 15,684
 43.8%
Conventional Acquisition7,300
 992
 6,308
 635.9%
Other Conventional40,730
 39,008
 1,722
 4.4%
Total729,657
 679,422
 50,235
 7.4%
Property operating expenses:       
Conventional Same Store202,814
 198,161
 4,653
 2.3%
Conventional Redevelopment20,579
 16,479
 4,100
 24.9%
Conventional Acquisition3,156
 573
 2,583
 450.8%
Other Conventional18,715
 17,970
 745
 4.1%
Total245,264
 233,183
 12,081
 5.2%
Property net operating income:       
Conventional Same Store427,361
 405,493
 21,868
 5.4%
Conventional Redevelopment30,873
 19,289
 11,584
 60.1%
Conventional Acquisition4,144
 419
 3,725
 889.0%
Other Conventional22,015
 21,038
 977
 4.6%
Total$484,393
 $446,239
 $38,154
 8.6%
 Year Ended December 31,
(in thousands)2017 2016 $ Change % Change
Rental and other property revenues before utility reimbursements:       
Same Store communities$547,912
 $530,619
 $17,293
 3.3%
Other Real Estate communities233,282
 189,683
 43,599
 23.0%
Total781,194
 720,302
 60,892
 8.5%
Property operating expenses, net of utility reimbursements:       
Same Store communities141,773
 140,007
 1,766
 1.3%
Other Real Estate communities80,958
 70,419
 10,539
 15.0%
Total222,731
 210,426
 12,305
 5.8%
Proportionate property net operating income:       
Same Store communities406,139
 390,612
 15,527
 4.0%
Other Real Estate communities152,324
 119,264
 33,060
 27.7%
Total$558,463
 $509,876
 $48,587
 9.5%

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For the year ended December 31, 2014, as2017 compared to 2013,2016, our conventionalReal Estate segment’s proportionate property net operating income increased $38.2$48.6 million, or 8.6%9.5%.
For the year ended December 31, 2014, as compared to 2013, Conventional Same Store proportionate property net operating income increased by $21.9$15.5 million, or 5.4%4.0%. This increase was primarily attributable to a $26.5$17.3 million, or 4.4%3.3%, increase in rental and other property revenues due to higher average revenues (approximately $65of approximately $59 per effective home),home, comprised primarily of increases in rental rates, utility reimbursements, and other fees including parking, andrates. Renewal rents, which is the rent paid by an existing resident who renewed a 20 basis point increase in average daily occupancy. Rental rates on new leases transacted duringlease compared to the rent paid prior to renewal, were up 4.6% for the year ended December 31, 2014,2017, and new lease rents, which is the rent paid by a new resident compared to the rent paid by the previous resident of the same apartment home, were 3.7% higher than expiring lease rates, and renewal rates were 5.2% higher than expiring lease rates.up 0.6%, resulting in a weighted average increase of 2.5%. The increase in Conventional Same Store rental and other property revenues was partially offset by a $4.7$1.8 million, or 2.3%1.3%, increase in property operating expenses, primarily due to an increase

increases in utilities and real estate taxes, partially offset by a decrease in insurance costs.taxes. During the year ended December 31, 2014, as2017 compared to 2013,2016, controllable operating expenses, which exclude utility costs, real estate taxes and insurance, increaseddecreased by $0.5$1.6 million, or 0.5%2.1%.
Our Conventional RedevelopmentThe proportionate property net operating income of Other Real Estate communities increased by $11.6$33.1 million, during theor 27.7%, for theyear ended December 31, 2014, as2017 compared to 2013, 2016 primarily due to increases in net operating income associated with apartment homes placed into service following completion of construction activities. Fromto:December 31, 2013 to December 31, 2014, we placed an additional 632, 308
redevelopment and 72 apartment homes into service at our Lincoln Place, Pacific Bay Vistas and The Preserve at Marin redevelopment communities, respectively.
Our Conventional Acquisition proportionate property net operating income increased by $3.7 millionlease-up activities during the year ended December 31, 2014, as compared2017, which helped contribute to 2013, due to apartment communities we acquired in 2014 and the latter part of 2013.
Our Other Conventional proportionate property net operating income increased by $1.0 million, or 4.6%, during the year ended December 31, 2014, as compared to 2013, primarily due to recovery of previously recognized bad debts related to one of our apartment communities in New York City.
Affordable Real Estate Operations
Our affordable segment consists of apartment communities we classify as Affordable Same Store or Other Affordable. Affordable Same Store apartment communities are those we manage that are subject to tax credit agreements and that have reached and maintained a stabilized occupancy (greater than 90%) during the current year and prior year-to-date periods. Other Affordable apartment communities are those that do not meet the Affordable Same Store apartment community definition because they have not maintained a stabilized level of occupancy, often due to a casualty event, we do not manage them, or they are not subject to tax credit agreements.
At December 31, 2015, as defined by our segment performance metrics, our affordable portfolio consisted of 45 Affordable Same Store apartment communities with 7,311 apartment homes and two Other Affordable apartment communities with 595 apartment homes.
From December 31, 2014, to December 31, 2015, on a net basis, our Affordable Same Store portfolio increased by one apartment community with 200 apartment homes that was reclassified to our Affordable Same Store portfolio upon maintaining a stabilized level of occupancy following a casualty event.

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Our affordable results for the years ended December 31, 2015 and 2014, presented below are based on the apartment community populations at December 31, 2015.
 Year Ended December 31,
(in thousands)2015 2014 $ Change % Change
Rental and other property revenues:       
Affordable Same Store$88,376
 $86,441
 $1,935
 2.2 %
Other Affordable8,173
 8,060
 113
 1.4 %
Total96,549
 94,501
 2,048
 2.2 %
Property operating expenses:       
Affordable Same Store35,063
 35,089
 (26) (0.1)%
Other Affordable3,421
 3,318
 103
 3.1 %
Total38,484
 38,407
 77
 0.2 %
Property net operating income:       
Affordable Same Store53,313
 51,352
 1,961
 3.8 %
Other Affordable4,752
 4,742
 10
 0.2 %
Total$58,065
 $56,094
 $1,971
 3.5 %
For the year ended December 31, 2015, as compared to 2014, our affordable segment’s proportionate property net operating income increased $2.0 million, or 3.5%. The increase was attributable to a $2.0 million increase in rental income driven primarily by higher rental rates of $22 per month on apartment homes.
At December 31, 2014, our affordable portfolio consisted of 44 Affordable Same Store apartment communities with 7,111 apartment homes and three Other Affordable apartment communities and 795 apartment homes.
Our affordable results for the years ended December 31, 2014 and 2013 presented below are based on the apartment community populations at December 31, 2014 (excluding amounts related to apartment communities sold or classified as held for sale during 2015).
 Year Ended December 31,
(in thousands)2014 2013 $ Change % Change
Rental and other property revenues:       
Affordable Same Store$84,816
 $83,332
 $1,484
 1.8 %
Other Affordable9,685
 9,701
 (16) (0.2)%
Total94,501
 93,033
 1,468
 1.6 %
Property operating expenses:       
Affordable Same Store34,182
 33,176
 1,006
 3.0 %
Other Affordable4,225
 4,257
 (32) (0.8)%
Total38,407
 37,433
 974
 2.6 %
Property net operating income:       
Affordable Same Store50,634
 50,156
 478
 1.0 %
Other Affordable5,460
 5,444
 16
 0.3 %
Total$56,094
 $55,600
 $494
 0.9 %
For the year ended December 31, 2014, as compared to 2013, the proportionateincremental property net operating income of our affordable apartment communities increased $0.5$20.9 million or 0.9%. The increase in proportionatecompared to 2016; and
higher property net operating income was primarily attributable to an increaseof $12.0 million from other communities, including the effect of our increased ownership interest in rental income driven by higher rental rates, partially offset by an increasethe Palazzo communities from our June 2017 reacquisition of the 47% limited partner interest in utilities expense.the related joint venture.
Non-Segment Real Estate Operations
Real estate operations net operatingOperating income amounts not attributed to our conventional or affordable segmentsReal Estate segment include property management revenues, offsite costs associated with property management, and casualty losses, and the results of apartment communities sold or held for sale, reported in consolidated amounts, which we do not allocate to our conventional or affordable segmentsReal Estate segment for purposes of evaluating segment performance, (seeas described in Note 1512 to the consolidated financial statements in Item 8). We also exclude the results of apartment communities sold and classified as held for sale from our conventional or affordable segments for purposes of evaluating segment performance.

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For the years ended December 31, 2015, 2014 and 2013, property management expenses, which include offsite costs associated with managing apartment communities we own (both our share and the share that we allocate to the limited partners in our consolidated partnerships), totaled $24.7 million, $25.3 million and $30.7 million, respectively. The decrease in property management expenses in these periods was primarily due to reductions in personnel and related costs based on the reduction in the number of apartment communities we own and manage.8.
For the years ended December 31, 2015, 20142018, 2017 and 2013,2016, casualty losses totaled $8.3$4.0 million, $11.8$8.2 million and $6.7$5.6 million, respectively. Casualty losses during the year ended December 31, 2015,2018 included several claims, primarily due to storm and fire damage, partially offset by recovery from insurance carriers for insured losses resulting from property damage and snow removal costs associated with the severe snow storms in the Northeast.excess of policy limits. Casualty losses were elevated during the year ended December 31, 2014, included losses from2017, primarily due to hurricane damage.
For the severe weather associated withyears ended December 31, 2018, 2017 and 2016, apartment communities previously in our Real Estate portfolio that were sold or classified as held for sale generated net operating income of $22.3 million, $59.6 million and $79.7 million, respectively.
Asset Management Results
Prior to the 2014 “Polar Vortex,” which affected manyJuly 2018 sale of our Asset Management business, we provided asset management and other services to certain consolidated partnerships owning apartment communities in the Northeast and Midwest, as well damage to one of our apartment communities resulting from a severe hail storm.
Tax Credit and Asset Management Revenues
We sponsor certain consolidated partnerships that acquire, develop and operate qualifying affordablequalify for low-income housing apartment communitiestax credits and are structured to provide for the pass-through of tax credits and tax deductions to their partners. We recognize
Contribution from Asset Management in our consolidated financial statements included: fees and other amounts paid to us from the net operating income of partnerships served by our Asset Management business, less interest expense incurred on non-recourse property debt obligations of the partnerships; income associated with the delivery of tax credits to the third-party investors in the partnerships; and benefits associated with these partnershipstransactional revenue and other income less asset management expenses, which included certain allocated offsite costs related to their partners.the operation of this business.
For the year ended December 31, 2015, as2018 compared to the year ended December 31, 2014, tax credit and asset management revenues2017, contribution from Asset Management decreased $7.2 million. This decrease was attributable to a decrease in amortization of deferred tax credit income$19.3 million due to delivery of substantially all of the tax credits on various apartment communities during 2014 and 2015, and a decrease in disposition and other transactional fees earned in 2015 as compared to 2014.
For the year ended December 31, 2014, as compared to the year ended December 31, 2013, tax credit and asset management revenues decreased $3.3 million. This decrease was attributable to a decrease in amortization of tax credit income, and a decrease in disposition and other transactional fees earned in 2014, as compared to 2013.
Certain of the apartment communities within our tax credit partnerships have delivered substantially all of the tax credits, or are anticipated to deliver substantially all of the tax credits during 2016. As the tax credit delivery and compliance periods for these apartment communities expire, amortization of deferred income associated with the delivery of tax credits and benefits decreases. We expect amortization of deferred tax credit income to decrease from $24.1 million in the year ended December 31, 2015, to approximately $19 million for the year ending December 31, 2016.
Investment Management Expensesits July 2018 sale.
For the year ended December 31, 2015,2017 compared to 2016, contribution from Asset Management decreased $8.8 million due to decreases in tax credit income as the result of delivering final credits and acquiring certain partners’ interests in the partnerships, as well as transactional revenues.
Depreciation and Amortization
For the year ended December 31, 2014, investment management expenses decreased $1.52018 compared to 2017, depreciation and amortization expense increased by $11.6 million primarily due to decreases in acquisition and other costs, partially offset by an increase in personnel and related costs.
For the year ended December 31, 2014, compared to the year ended December 31, 2013, investment management expenses increased $3.0 million primarily due to increases in acquisition and other costs, partially offset by a decrease in personnel and related costs.
Depreciation and Amortization
During the years ended December 31, 2015, 2014 and 2013, depreciation and amortization totaled $306.3 million, $282.6 million and $291.9 million, respectively. The $23.7 million increase from 2014 to 2015 was primarily due to assets placed into service as we completed apartment homes in our redevelopment projects, and assets we acquired in 20142018 and 2015,renovated apartment homes placed in service after their completion, partially offset by decreases associated with apartment communities sold. The $9.3 million decrease from 2013 to 2014 was primarily due to assets that became fully depreciated and apartment community sales, partially offset by an increase associated with our redevelopment apartment communities as completed apartment homes were placed into service.
Provision for Real Estate Impairment Losses
Based on periodic tests of recoverability of long-lived assets, duringFor the year ended December 31, 2014, we recognized2017 compared to 2016, depreciation and amortization expense increased by $33.1 million primarily due to renovated apartment homes placed in service after their completion, a $1.8 million provision for real estate impairment loss related to an asset that was sold duringfull year of depreciation following the year ended December 31, 2014. The impairment loss was driven2016 completion of our One Canal development and 2016 acquisition of Indigo, and other capital additions, partially offset by inclusion of estimated costs to sell, inclusive of a debt prepayment penalty, in the impairment calculation when the property became held for sale.decreases associated with apartment communities sold.

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General and Administrative Expenses
In recent years, we have worked toward simplifying our business, including winding down the portionsale of our business that generates transaction-based activity fees and reducing the number of partnerships that own our conventional apartment communities by acquiring the noncontrolling interests in these partnerships,Asset Management Business, which allowed us to reduce overhead and other costs associated with these activities. Thesecosts. This simplification and other simplification activities, along with our scale reductions have allowed us to reduce our offsite

costs, which consist of general and administrative expenses, as well as property management expenses and investment management expenses, by $23.4$6.4 million, or 24%8.6%, over the last three years.
For the year ended December 31, 2015,2018 compared to 2017, general and administrative expenses increased $2.6 million, primarily due to higher variable incentive compensation cost.
For the year ended December 31, 2014,2017 compared to 2016, general and administrative expenses decreased $0.9$3.1 million, or 2.1%, primarily due to reductions inlower personnel and related costs partially offset by an increase in administrativeincluding incentive compensation, professional services, technology costs including travel and consultingother corporate costs.
For the year ended December 31, 2014, compared to the year ended December 31, 2013, general and administrative expenses decreased $1.6 million, or 3.5%, primarily due to reductions in personnel and related costs.
Other Expenses, Net
Other expenses, net includes franchise taxes, costs associated with our risk management activities, partnership administration expenses and certain non-recurring items.
For the year ended December 31, 2015,2018 compared to 2017, other expenses, net decreased by $7.4 million, primarily due to the resolution of our litigation against Airbnb, and settlement of litigation related to the challenge to the title of the La Jolla Cove property which we acquired in 2014.
For the year ended December 31, 2014,2017 compared to 2016, other expenses, net decreased by $2.2$3.1 million. The decrease was primarily due to lower legalthe 2016 recognition of estimated future environmental clean-up and otherabatement costs as well asassociated with the favorable resolution of certain legal matters discussed in 2015,Note 5 to the consolidated financial statements in Item 8, partially offset by higher environmentallegal costs associatedwe incurred related to a challenge to the title of the La Jolla Cove property.
Provision for Real Estate Impairment Loss
We recognized no provisions for impairment losses during the years ended December 31, 2018 or 2016.
During the year ended December 31, 2018, we agreed to sell our interests in the entities owning the La Jolla Cove property in settlement of legal actions filed in 2014 by a group of disappointed buyers who had hoped to acquire the property. As a result of the settlement, we recognized in our 2017 results a gross impairment loss of $35.8 million, $25.6 million of which related to the establishment of a deferred tax liability assumed in connection with our acquisition of the business entities. The tax liability was assumed by the buyer, resulting in no economic loss to us. The remaining $10.2 million loss was offset by cash distributions paid to us during our ownership and avoided legal costs for continued litigation. On an apartment communityeconomic basis, we no longer own.agreed to sell these entities at roughly our purchase price, adjusted for retained cash distributions and avoided legal costs.
Interest Income
For the year ended December 31, 2014,2018 compared to the year ended December 31, 2013, other expenses, net2017, interest income increased by $5.1 million. The net increase was$2.6 million, primarily due to an increaseinterest earned on the seller financing notes received as consideration in legal and other costs and due to certain nonrecurring recoveries recognized during 2013.
Interest Income
Interest income consists primarilythe sale of interest on notes receivable, accretion of discounts on certain notes receivable, interest on cash and restricted cash accounts and interest on investments in debt securities of a securitization that holds certain of our property debt, which investments are classified within other assets in our consolidated balance sheets.
For the year ended December 31, 2015, as compared to the year ended December 31, 2014, interest income increased by less than $0.1 million.La Jolla Cove property.
For the year ended December 31, 2014, as compared to the year ended December 31, 2013, interest income decreased by $11.1 million. Interest income decreased by $4.5 million due to accretion income recognized in 2013 related to an apartment community sale for which the net proceeds available for repayment of partnership loans exceeded the amounts previously anticipated. Interest income also decreased by $4.7 million due to interest on certain property loans we purchased in 2013 and held for approximately six months prior to their repayment.
Interest Expense
For the year ended December 31, 2015,2018 compared to the year ended December 31, 2014,2017, interest expense, which includes the amortization of debt issuance costs and amortization of deferred financing costs, andincreased by $6.0 million, or 3.1%. The increase was primarily due to debt prepayment penalties of $14.9 million incurred onin connection with 2018 property-level debt refinancings,refinancing activity undertaken to refinance property-level debt that was scheduled to mature in 2019, 2020, and 2021, partially offset by a decrease in mortgage interest expense for communities sold and the sale of the Asset Management business in July 2018, and lower corporate-level interest.
For the year ended December 31, 2017 compared to 2016, interest expense decreased by $21.3$1.8 million, or 9.6%0.9%. The decrease was primarily the result ofdue to lower average outstanding balances on non-recourse property debt for our existingReal Estate apartment communities decreasesand lower interest rates, resulting in property debt resulting from apartment community dispositions and higher prepayment penalties incurred in 2014. These decreasesan $11.9 million reduction in interest expenseexpense. These decreases were partially offset by increases relatedhigher amounts outstanding on corporate borrowings (including our term loan and incremental line borrowings used to our acquisitiontemporarily fund the reacquisition of apartment communitiesthe Palazzo limited partner interests) and on three ofa decrease in capitalized interest associated with our redevelopment projects which reached completion of construction and therefore ceased capitalization of related interest expense.development activities.
For the year ended December 31, 2014, compared to the year ended December 31, 2013, interest expense decreased by $16.1 million, or 6.8%. The decrease was primarily the result of lower average outstanding balances on non-recourse property debt for our existing apartment communities and from sales, partially offset by an increase in interest expense on three of our redevelopment projects nearing or reaching completion and an increase in corporate interest due to higher average borrowings.

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Other, Net
Other, net includes gains or losses on disposition of interests in unconsolidated real estate partnerships, our equity in the income or loss of unconsolidated real estate partnerships, and the results of operations related to our legacy asset managementthe NAPICO business, which we accountaccounted for under the profit sharing method as further discussed in Note 3prior to the consolidated financial statements in Item 8.
During the years ended December 31, 2015, 2014 and 2013, other, net primarily consisted of $0.2 million of net income, $0.8 million of net losses, and $1.8 million of net income, respectively, related to our legacy asset management business. After income taxes and noncontrolling interest allocations, our sharederecognition of the net losses and income of the legacy asset management business totaled $3.6 million of net income, $1.2 million of net losses and $22.5 million of net income for the years ended December 31, 2015, 2014 and 2013, respectively (see Note 3 to the consolidated financial statements in Item 8).final property during 2017.
Income Tax Benefit
Certain of our operations or a portion thereof, including property management, asset management and risk management are conducted through TRS entities. Income taxes related to the results of continuing operations of our TRS entities (before gains on dispositions) are included in income tax benefit in our consolidated statements of operations.
Prior to December 15, 2014, the interests in our tax credit business were owned through TRS entities. On December 15, 2014, our TRS entities sold the interests held in our tax credit business to the Aimco Operating Partnership. Through the date of sale the income resulting from these interests was subject to income taxes. The Federal tax liabilities resulting from the sale were substantially offset through the utilization of net operating loss carry forwards and historic and other tax credits. In accordance with GAAP applicable to income tax accounting for intercompany transactions, net tax expense associated with the sale, totaling approximately $3.5 million, has been deferred within our consolidated balance sheet, and is being recognized in earnings as the assets of the tax credit business affect our GAAP income or loss, through depreciation, impairment losses, or sales to third party entities. Subsequent to the sale of the tax credit business, the income resulting from interests held in the tax credit business will not result in Federal income tax liability to the Aimco Operating Partnership.
For the year ended December 31, 2015,2018 compared to the year ended December 31, 2014, income tax benefit increased2017, other, net decreased by $7.5 million, from $20.0 million to $27.5$7.4 million, primarily due to the taxable income generated by our tax credit business prior to the intercompany sale of this business in late 2014 to the Aimco Operating Partnership, and an increase in historic tax credits.
For the year ended December 31, 2014, compared to the year ended December 31, 2013, income tax benefit increased by $18.1 million, from $2.0 million to $20.0 million, primarily due to a $7.6 million increase in the tax benefit associated with historic tax credits earned from the redevelopment of our Lincoln Place apartment community as well as an increase in taxable losses recognized by our TRS entities.
Income from Discontinued Operations, Net
Effective January 1, 2014, we adopted ASU 2014-08, which generally eliminates the requirement that we classify within discontinued operations the results of operations and any gain or loss on sale related to apartment communities sold or classified as held for sale commencing in 2014. Based on the prospective applicationderecognition of the new accounting standard, the net earnings for any consolidated apartment communities sold through December 31, 2013, are included within income from discontinued operations. The components of net earnings that were classified as discontinued operations included all property-related revenues and operating expenses, depreciation expense recognized prior to the sale, property-specific interest expense and debt extinguishment gains and losses to the extent there was debt on the apartment community. In addition, any impairment losses on assets sold or held for sale and the net gain or loss on the disposal of apartment communities held for sale are reportedfinal NAPICO property in discontinued operations for the year ended December 31, 2013.
2017, which resulted in a gain. For the year ended December 31, 2013, income from discontinued operations totaled $203.2 million. During2017 compared to 2016, other, net increased by $2.1 million, also attributed to gain recognized upon the year ended December 31, 2013, we sold 29 consolidated apartment communities for an aggregate sales pricederecognition of $515.8 million, resulting in net proceeds of $233.1 million and a net gain of approximately $200.6 million (which is net of $11.8 million of related income taxes).NAPICO property.

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Gain on Dispositions of Real Estate Net
The table below summarizes dispositions of Tax
As discussed above, commencing in 2014, the results of operations (both for current and prior periods) and gain or loss on sale for apartment communities sold or classified as held are generally no longer required to be classified within income from discontinued operations. During the year ended December 31, 2015, we sold 11 consolidated apartment communities for an aggregate sale price of $404.3 million, resulting in net proceeds of $229.4 million, and a net gain of $180.6 million (which is net of $1.8 million of related income taxes). During the year ended December 31, 2014, we sold 30 consolidated apartment communities for an aggregate sales price of $735.6 million, resulting in net proceeds of $456.6 million and a net gain of approximately $288.6 million (which is net of $36.1 million of related income taxes).
NOI capitalization rate and Free Cash Flow capitalization rate are common benchmarks used in the real estate industry for relative comparison of real estate valuations, including for apartment community sales, and are defined and further described under the Non-GAAP Performance and Liquidity Measures heading. The NOI and Free Cash Flow capitalization rates for our conventional and affordable apartment community salesReal Estate portfolio during the years ended December 31, 2015, 20142018, 2017 and 2013, were as follows:2016 (dollars in millions):
 2015 2014 2013
NOI capitalization rate:     
Conventional6.1% 6.8% 7.6%
Affordable3.8% 6.3% 5.8%
Free Cash Flow capitalization rate:     
Conventional4.9% 5.3% 5.8%
Affordable2.7% 5.3% 4.8%
  December 31,
  2018 2017 2016
Real Estate      
Number of apartment communities sold 4
 5
 7
Gross proceeds $242.3
 $397.0
 $517.0
Net proceeds (1) $235.7
 $385.3
 $511.0
Gain on disposition $175.2
 $297.9
 $383.6
(1)Net proceeds are after repayment of debt, if any, net working capital settlements, payment of transaction costs and debt prepayment penalties, if applicable.
The apartment communities sold from our Real Estate portfolio during 2015, 20142018, 2017 and 20132016 were primarily located outside of our targetprimary markets or in less desirablelower-rated locations within our targetprimary markets and had average revenues per apartment home significantly below those of our retained portfolio. Accordingly,
During the NOIyear ended December 31, 2018, we sold for $590 million our Asset Management business and Free Cash Flow capitalization ratesour four Hunters Point communities. Please refer to Note 3 to the consolidated financial statements in Item 8 for these properties may not be indicative of thosefurther details regarding this sale.
Income Tax Benefit
Certain of our operations, including property management and risk management, are conducted through taxable REIT subsidiaries, or TRS entities. Additionally, some of our apartment communities are owned through TRS entities.
Our income tax benefit calculated in accordance with GAAP includes: (a) income taxes associated with the income or loss of our TRS entities, for which the tax consequences have been realized or will be realized in future periods; (b) low income housing tax credits generated prior to the sale of our Asset Management business that offset REIT taxable income, primarily from retained portfolio.capital gains; and (c) historic tax credits that offset income tax obligations of our TRS entities. Income taxes related to these items, as well as changes in valuation allowance and the establishment of incremental deferred tax items in conjunction with intercompany asset transfers (if applicable), are included in income tax benefit in our consolidated statements of operations.
For the year ended December 31, 2018 compared to 2017, income tax benefit decreased by $17.8 million, from $30.8 million to $13.0 million. The decrease is primarily due to the reversal of a $19.3 million net tax benefit we recognized as a result of the December 2017 tax reform legislation in 2017 (as further discussed in Note 9 to the consolidated financial statements in Item 8) and higher tax expense related to gains on sale of real estate for communities held through TRS entities.
For the year ended December 31, 2017 compared to 2016, income tax benefit increased by $12.0 million, from $18.8 million to $30.8 million. The increase is primarily due to lower tax expense on the gains of sale of apartment communities, higher net operating losses at the TRS entities (including the La Jolla Cove impairment loss discussed above), higher tax benefit associated with low-income housing tax credits, and the $0.5 million net tax benefit we recognized for December 2017 tax reform legislation (as further discussed in Note 9 to the consolidated financial statements in Item 8).
Noncontrolling Interests in Consolidated Real Estate Partnerships
Noncontrolling interests in consolidated real estate partnerships reflects the results of our consolidated real estate partnerships allocated to the owners who are not affiliated with Aimco. The amounts of income or loss of our consolidated real estate partnerships that we allocate to owners not affiliated with Aimco include their share of property management fees, interest on notes and other amounts that we charge to these partnerships.
For the years ended December 31, 20152018, 2017 and 2014,2016, we allocated net income of $4.8$8.2 million, $9.1 million, and $24.6$25.3 million, respectively, to noncontrolling interests in consolidated real estate partnerships, a decrease of $19.8 million.partnerships. The amountsamount of net income allocated to noncontrolling interests decreased primarily due to a decrease inwas driven by three primary factors: the amountoperations of gains on dispositions allocated to noncontrolling interests in our consolidated real estate partnerships, as well as a decrease in the amount of income allocated to noncontrolling interests due to deferred asset management fees recognized by the legacy asset management business during the year ended December 31, 2015.
For the years ended December 31, 2014 and 2013, we allocated net income of $24.6 million and $12.5 million, respectively, to noncontrolling interests in consolidated real estate partnerships, an increase of $12.1 million. Income allocable to noncontrolling interests in the legacy asset management business increased by $19.5 million, primarily due to the sales of interests in or dissolution of partnerships (see Note 3 to the consolidated financial statements in Item 8). apartment communities; gains on

the sale of apartment communities with noncontrolling interest holders; and the results of operations of the NAPICO business, as further discussed below.
The amountsamount of net income allocated to noncontrolling interests in other Aimcoresulting from operations of the consolidated apartment communities was $0.3 million, $2.4 million and $4.4 million for the years ended December 31, 2018, 2017 and 2016.
Gains on the sale of apartment communities allocated to noncontrolling interests totaled $7.9 million, $7.3 million and $13.0 million for the years ended December 31, 2018, 2017 and 2016, respectively.
We derecognized the NAPICO business in two transactions, which occurred in 2017 and 2016. We allocated an $8.1 million gain on sale and a $0.6 million net loss, respectively, to the noncontrolling interest holders in connection with the 2017 and 2016 transactions.
Net Income Attributable to Aimco Preferred Stockholders and the Aimco Operating Partnership’s Preferred Unitholders
Net income attributable to Aimco preferred stockholders and the Aimco Operating Partnership’s preferred unitholders decreased by $7.4$3.4 million and $2.9 million, respectively, during the year ended December 31, 2017 as compared to 2016. These decreases were primarily due to a reductionAimco’s redemption of its Class Z Preferred Stock in the amount of allocatable gains.2016.
Noncontrolling Interests in Aimco Operating Partnership
In Aimco’s consolidated financial statements, noncontrolling interests in the Aimco Operating Partnership reflects the results of the Aimco Operating Partnership that are allocated to the holders of OP Units. The amount of the Aimco Operating Partnership’s income allocatedUnit holders. Allocations to holders of preferred OP Units is equal to the amount of distributions they receive, which totaled $6.9 million, $6.5 million and $6.4 million for the years ended December 31, 2015, 2014 and 2013, respectively.
Aimco allocates the Aimco Operating Partnership’s income or loss to the holders of common OP Units and equivalents based on the weighted average number of these units (including those held by Aimco) outstanding during the period.
For the years ended December 31, 2015, 2014 and 2013, income allocated to common noncontrolling interests in the Aimco Operating Partnership were $11.6 million and $15.8 million and $11.6 million, respectively.

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Net Income Attributablefluctuate in proportion to Aimco Preferred Stockholders and the Aimco Operating Partnership’s Preferred Unitholders
Netvariations in net income, attributable to Aimco preferred stockholders and the Aimco Operating Partnership’s preferred unitholders increased by $3.8 million and $4.3 million, respectively, during the year ended December 31, 2015, as compared to the year ended December 31, 2014. These increases were primarily due to the issuance during May 2014 of $125.0 million of preferred securities with a 6.875% dividend/distribution rate, and were also partly attributable to the write-off of previously deferred issuance costs in connection with our March 2015 redemption of preferred securities.
Net income attributable to Aimco preferred stockholders and the Aimco Operating Partnership’s preferred unitholders increased by $5.1 million and $5.2 million, respectively, during the year ended December 31, 2014, as compared todescribed above. For the year ended December 31, 2013,2018 compared to 2017, net income allocated to noncontrolling interests in the Aimco Operating Partnership increased $20.0 million primarily due to the May 2014increase in net income, as well as an increase in the percentage allocated following the issuance of preferred securitiesOP Units as partial consideration for the acquisition of the four Philadelphia properties, discussed above. See Notes 9 and 10further in Note 3 to the consolidated financial statementsstatements. Net income allocated to noncontrolling interests in Item 8the Aimco Operating Partnership for further discussion of our preferred securities.the year ended December 31, 2017 decreased $5.9 million as compared to 2016 due to the decrease in net income between the periods.
Critical Accounting Policies and EstimatesLeverage Ratios
We preparetarget the ratio of Proportionate Debt and Preferred Equity to Adjusted EBITDA to be below 7.0x and we target the ratio of Adjusted EBITDA to Adjusted Interest Expense and Preferred Dividends to be greater than 2.5x. Our leverage ratios for the three months ended December 31, 2018, are presented below:
Proportionate Debt to Adjusted EBITDA6.8x
Proportionate Debt and Preferred Equity to Adjusted EBITDA7.2x
Adjusted EBITDA to Adjusted Interest Expense3.8x
Adjusted EBITDA to Adjusted Interest Expense and Preferred Dividends3.4x
Our Adjusted EBITDA has been calculated on a pro forma basis to adjust for significant items impacting the three months ended December 31, 2018 for which annualization would distort the results. Leverage ratios are elevated by 0.5x due to the use of debt to fund temporarily the Aimco common share repurchases completed during the three months ended December 31, 2018. We intend to reduce our consolidated financial statements in accordance with GAAP, which requires usProportionate Debt and Preferred Equity to make estimatesAdjusted EBITDA to 6.9x by the end of 2019 from earnings growth, primarily due to increasing contribution from Same Store apartment communities and assumptions. We believe thatreduction of debt balances due to regularly-scheduled debt amortization and apartment community sales, partially offset by the following critical accounting policies involve our more significant judgments and estimatesloss of earnings from communities sold. As used in the preparationratios above, Preferred Equity represents Aimco’s preferred stock and the Aimco Operating Partnership’s preferred OP units.
Refinancing Activity
During the year ended December 31, 2018, we addressed approximately half of our consolidated financial statements.property loans maturing in 2019, 2020, and 2021. We placed $867.4 million of new loans, $740.4 million of fixed-rate loans at a weighted average interest rate of 4.20% and a weighted average term of 9.3 years, and $127.0 million of variable-rate loans with rates floating at 115 basis points over 30-day LIBOR and a weighted average term of 5.1 years. This refinancing activity results in an annual interest savings of $13.0 million.
ImpairmentLiquidity
Our liquidity consists of Long-Lived Assets
Real estatecash balances and available capacity on our revolving line of credit. During the year ended December 31, 2018, we exercised our option to expand our revolving credit facility by $200.0 million, bringing the total borrowing capacity to $800.0 million. As of December 31, 2018, we had cash and restricted cash of $72.6 million and had the capacity to borrow up to $632.5 million on our revolving credit facility, after consideration of $7.1 million letters of credit backed by the facility. We use our credit facility primarily for working capital and other long-lived assetsshort-term purposes and to be heldsecure letters of credit.
We manage our financial flexibility by maintaining an investment grade rating and used are stated at cost, less accumulated depreciation and amortization, unless the carrying amount of the asset is not recoverable. If events or circumstances indicate that the carrying amount of an apartment community may not be recoverable, we make an assessment of its recoverability by comparing the carrying amount to our estimate of the undiscounted future cash flows, excluding interest charges, of the apartment community. If the carrying amount exceeds the estimated aggregate undiscounted future cash flows, we recognize an impairment loss to the extent the carrying amount exceeds the estimated fair value of the apartment community.
Our portfolio strategy is to sell each year the 5% to 10% of our portfolio with lower projected returns, lower operating margins, and lower expected future rent growth, and reinvest the sale proceeds in apartment communities already in our portfolio, through property upgrades and redevelopment, or through the purchase of other apartment communities and, in limited situations, the development of apartment communities. As we execute this strategy, we evaluate alternatives to sell or reduce our interest in apartment communities that do not align with our long-term investment strategy, although there is no assurance that we will sell or reduce our investment in such apartment communities during the desired time frame. For anyholding apartment communities that are sold or meetunencumbered by property debt. At December 31, 2018, we held unencumbered apartment communities with an estimated fair market value of approximately $2.7 billion, up 50% from December 31, 2017.
Two credit rating agencies rate our creditworthiness, using different methodologies and ratios for assessing our credit, and both have rated our credit and outlook as BBB- (stable), an investment grade rating. Although some of the criteriaratios they use are similar to those we use to measure our leverage, there are differences in our methods of calculation and therefore our leverage ratios disclosed above are not indicative of the ratios that may be calculated by these agencies.

Equity Capital Activities
During the year ended December 31, 2018, we repurchased 8.7 million shares of common stock, of which 0.5 million settled in January 2019, all for $394.1 million, at a weighted average price of $45.33 per share, approximately a 20% discount to our published NAV per share. Approximately half of the repurchases were funded with proceeds from 2018 and January 2019 property sales at a premium to the values ascribed to these communities in our published NAV. The remaining half of repurchases are temporarily funded with borrowings on our credit facility. We expect to repay these borrowings with proceeds from the sale of communities now under contract, again at prices greater than those used in our published NAV. With the completion of these transactions, we will have increased NAV by an estimated $0.67 per share.
The 2019 property sales necessary to fund our share repurchases are expected to generate taxable gains of $285 million, which is in excess of our regular quarterly dividend. Accordingly, on February 3, 2019, Aimco’s Board of Directors declared a special dividend on the common stock that consists of $67.1 million in cash and 4.5 million shares of common stock. The special dividend will be payable on March 22, 2019, to stockholders of record as of February 22, 2019. The special dividend also includes the regular quarterly cash dividend, which for 2019 is expected to be classified as held for sale$0.39 per share, which represents an increase of 3% compared to cash dividends paid during 2018.
Stockholders will have the next 12 months,opportunity to elect to receive the reductionspecial dividend in the estimated holding period for these apartment communities may result in impairment losses.
Capitalized Costs
We capitalize costs, including certain indirect costs, incurred in connection with our capital additions activities, including redevelopment, development and construction projects, other tangible apartment community improvements and replacements of existing apartment community components. Included in these capitalized costs are payroll costs associated with time spent by site employees in connection with the planning, execution and controlform of all capital additions activities atcash or all stock, subject to proration if either option is oversubscribed. Based on Aimco’s closing share price on February 15, 2019, we estimate the apartment community level. We characterize as “indirect costs” an allocationaggregate value of certain department costs, including payroll, at the area operationsspecial dividend to be approximately $290.3 million. However, the actual value will vary depending on the price of Aimco common stock on the dividend valuation dates (March 11 and corporate levels that clearly relate12, 2019).
In order to capital additions activities. Weneutralize the dilutive impact of the stock issued in the special dividend, Aimco’s Board also capitalize interest, property taxesauthorized a reverse stock split, effective on February 20, 2019. As a result, total shares outstanding following completion of both the special dividend and insurance during periodsthe reverse stock split are expected to be unchanged from the total shares outstanding immediately prior to the transactions. Some stockholders may have more Aimco shares and some may have fewer based on their individual elections. The reverse split will facilitate comparability of Aimco per share results before and after these transactions.
In aggregate, these transactions:
Increase NAV per share by 1%;
Do not affect Aimco’s regular quarterly cash dividend;
Reduce the number of Aimco shares outstanding by 6% (as a result of the share repurchases);
Minimize the aggregate tax paid by Aimco and its stockholders;
Are leverage neutral; and
Result in which redevelopment, developmentno change in the number of shares outstanding (as a result of the special dividend and construction projectsthe reverse stock split), thereby improving comparability of per share results.
Team and Culture
Our team and culture are in progress. We commence capitalization of costs, including certain indirect costs, incurred in connection withkeys to our capital addition activities, at the point in time when activities necessary to get apartment communities readysuccess. Our intentional focus on a collaborative and productive culture based on respect for their intended use begin. These activities include when apartment communities or apartment homes are undergoing physical construction, as well as when apartment homes are held vacant in advance of planned construction, provided that other activities such as permitting,others and personal responsibility is reinforced by a preference for promotion from within based on succession planning and design aretalent development to produce a strong, stable team that is the enduring foundation of our success. In 2018, we were recognized by the Denver Post as a Top Work Place for the sixth consecutive year, an accomplishment shared with only seven other companies in progress. We cease the capitalization of costs when the assets are substantially complete and ready for their intended use, which is typically when construction has been completed and apartment homes are available for occupancy. We charge costs including ordinary repairs, maintenance and resident turnover costs to property operating expense, as incurred. Refer to the discussion of investing activities within the Liquidity and Capital Resources section for a summary of costs capitalized during the periods presented.
Non-GAAP Performance and Liquidity MeasuresColorado.
Various of theKey Financial Indicators
The key financial indicators that we use in managing our business and in evaluating our financial condition and operating performance are non-GAAP measures. Key non-GAAP measures we use are defined and described below, and for those non-GAAP measures used or disclosed within this annual report, reconciliations of the non-GAAP measures to the most comparable financial measure computed in accordance with GAAP are provided.

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Economic Income, represents the annual change in Net Asset Value per share plus cash dividends per share. Net Asset Value is the estimated fair valueour measure of long-term total return, and AFFO, our assets, netmeasure of liabilities, noncontrolling interestscurrent return. In addition to these indicators, we evaluate our operating performance and preferred equity.
Funds from Operations,financial condition using: Pro forma Funds From Operations and Adjusted Funds From Operations are non-GAAP financial measures, which are defined and further described below under the Funds From Operations and Adjusted Funds From Operations heading.
FFO; Free Cash Flow, as calculated for our retained portfolio, represents an apartment community’sFlow; Same Store property net operating income; proportionate property net operating income; average revenue per effective apartment home; leverage ratios; and net leverage.

Results of Operations
Because our operating results depend primarily on income less spendingfrom our apartment communities, the supply of and demand for capital replacements (further discussed underapartments influences our operating results. Additionally, the Liquiditylevel of expenses required to operate and Capital Resources heading). Free Cash Flow internal rate of return represents the rate of return generated from anmaintain our apartment community’s Free Cash Flowcommunities and the proceeds from its eventual sale.pace and price at which we redevelop, acquire and dispose of our apartment communities affect our operating results.
Free Cash Flow capitalization rateThe following discussion and NOI capitalization rate are common benchmarks usedanalysis of the results of our operations and financial condition should be read in conjunction with the real estate industryaccompanying consolidated financial statements in Item 8.
Overview
2018 compared to2017
Net income attributable to Aimco and net income attributable to the Aimco Operating Partnership increased by $350.5 million and $370.4 million, respectively, for relative comparisonthe year ended December 31, 2018 as compared to 2017. The increase in income was primarily due to an increase in gain on dispositions of real estate, valuations, including the 2018 sale of our Asset Management business, and results of operations described more fully below, partially offset by an increase in depreciation and amortization resulting from redeveloped and developed apartment homes placed into service.

2017 compared to2016
Net income attributable to Aimco and net income attributable to the Aimco Operating Partnership decreased by $114.6 million and $120.0 million, respectively, for the year ended December 31, 2017 as compared to 2016. The decrease in income was principally due to a decrease in gain on dispositions of real estate and an increase in depreciation and amortization resulting from redeveloped apartment community sales. For purposeshomes placed into service and the completion of calculating such capitalization rates forOne Canal and the acquisition of Indigo in 2016, partially offset by improved operating results.
The following paragraphs discuss these and other items affecting the results of operations of Aimco and the Aimco Operating Partnership in more detail.
Property Operations
As described under the preceding Executive Overview heading, we have a single reportable segment, Real Estate, which consists of market rate apartment community sales, Free Cash Flow capitalization rate represents an apartment community’s trailing twelve month NOI prior to sale, less $1,200 of assumed annual capital replacement spending, divided by gross proceeds, and NOI capitalization rate represents an apartment community’s trailing twelve month NOI prior to sale, lesscommunities in which we hold a management fee equal to 3% of revenue, divided by gross proceeds.substantial equity ownership interest.
Same store property operating results andWe use proportionate property net operating income are defined and further described underto assess the preceding Resultsoperating performance of Operations –our Real Estate Operations heading. Average revenue per effective apartment home representsportfolio. Proportionate property net operating income reflects our share of rental and other property revenues, dividedexcluding resident utility reimbursement, less direct property operating expenses, net of resident utility reimbursement, and including real estate taxes, for consolidated apartment communities we manage. Accordingly, the results of operations of our Real Estate segment discussed below are presented on a proportionate basis and exclude the results of four apartment communities with 142 apartment homes that we neither manage nor consolidate. Beginning in 2018, our segment results below reflect utility reimbursements as a reduction of the corresponding expense. We have revised the 2017 and 2016 amounts to conform to this presentation.
We do not include offsite costs associated with property management or casualty-related amounts in our assessment of segment performance. Accordingly, these items are not allocated to our segment results discussed below.
Refer to Note 12 to the consolidated financial statements in Item 8 for further discussion regarding our reportable segment, including a reconciliation of these proportionate amounts to consolidated rental and other property revenues and property operating expenses.
Real Estate Proportionate Property Net Operating Income
We classify apartment communities within our Real Estate segment as Same Store and Other Real Estate. Same Store communities are those that have reached a stabilized level of operations as of the beginning of a two-year comparable period and maintained it throughout the current and comparable prior year, and are not expected to be sold within 12 months. Other Real Estate includes apartment communities that do not meet the Same Store definition, including, but not limited to: redevelopment and development apartment communities, which are those currently under construction that have not achieved a stabilized level of operations and those that have been completed in recent years that have not achieved and maintained stabilized operations for both the current and comparable prior year; acquisition apartment communities, which are those we have acquired since the beginning of a two-year comparable period; and communities that we expect to sell within 12 months but do not yet meet the criteria to be classified as held for sale.

As of December 31, 2018, our Real Estate segment consisted of 93 Same Store communities with 25,905 apartment homes and 35 Other Real Estate communities with 9,720 apartment homes.
From December 31, 2017 to December 31, 2018, on a net basis, our Same Store portfolio increased by one community and decreased by 481 apartment homes. These changes consisted of:
the addition of one developed apartment community with 91 apartment homes and one redeveloped apartment community with 104 apartment homes that were classified as Same Store upon maintaining stabilized operations for the entirety of the periods presented;
the addition of one acquired apartment community with 115 apartment homes that was classified as Same Store because we have now owned it for the entirety of the periods presented;
the addition of one apartment community with 492 apartment homes which we no longer expect to sell within 12 months;
the reduction of one apartment community with 821 apartment homes sold during the period;
the reduction of one apartment community with 94 apartment homes we expect to sell during 2019; and
the reduction of one apartment community with 368 apartment homes classified as held for sale at December 31, 2018.
As of December 31, 2018, our Other Real Estate communities included:
13 apartment communities with 6,294 apartment homes in redevelopment or development;
7 apartment communities with 1,943 apartment homes recently acquired; and
15 apartment communities with 1,483 apartment homes that do not meet the definition of Same Store because they are either subject to agreements that limit the amount by which we may increase rents or have not reached or maintained a stabilized level of occupancy as of the beginning of a two-year comparable period, often due to a casualty event.
Our Real Estate segment results for the years ended December 31, 2018 and 2017, as presented below, are based on the apartment community classifications as of December 31, 2018.
 Year Ended December 31,
(in thousands)2018 2017 $ Change % Change
Rental and other property revenues before utility reimbursements:       
Same Store communities$580,536
 $563,040
 $17,496
 3.1%
Other Real Estate communities273,704
 218,154
 55,550
 25.5%
Total854,240
 781,194
 73,046
 9.4%
Property operating expenses, net of utility reimbursements:       
Same Store communities150,042
 145,301
 4,741
 3.3%
Other Real Estate communities88,818
 77,430
 11,388
 14.7%
Total238,860
 222,731
 16,129
 7.2%
Proportionate property net operating income:       
Same Store communities430,494
 417,739
 12,755
 3.1%
Other Real Estate communities184,886
 140,724
 44,162
 31.4%
Total$615,380
 $558,463
 $56,917
 10.2%
For the year ended December 31, 2018 compared to 2017, our Real Estate segment’s proportionate property net operating income increased $56.9 million, or 10.2%.
Same Store proportionate property net operating income increased by $12.8 million, or 3.1%. This increase was primarily attributable to a $17.5 million, or 3.1%, increase in rental and other property revenues due to higher average monthly revenues of $50 per Aimco apartment home comprised of increases in rental rates and a 50 basis point increase in average daily occupancy. Renewal rents, which is the rent paid by an existing resident who renewed a lease compared to the rent paid prior to renewal, were up 4.5% for the year ended December 31, 2018, and new lease rents, which is the rent paid by a new resident compared to the rent paid by the numberprevious resident of occupiedthe same apartment home, were up 1.5%, resulting in a weighted average increase of 3.0%. The increase in Same Store rental and other property revenues was partially offset by a $4.7 million, or 3.3%, increase in property operating expenses, primarily due to increases in real estate taxes and repairs and maintenance costs. During the year ended

December 31, 2018 compared to 2017, controllable operating expenses, which exclude utility costs, real estate taxes and insurance, increased by $1.5 million, or 2.0%.
The proportionate property net operating income of Other Real Estate communities increased by $44.2 million, or 31.4%, for the year ended December 31, 2018 compared to 2017 primarily due to:
a $24.1 million increase in property net operating income due to the 2018 acquisition of the four Philadelphia communities, Bent Tree Apartments and Avery Row, as well as the stabilization of Indigo;
an $11.0 million increase in property net operating income due to leasing activities at redevelopment and development communities, partially offset by decreases due to apartment homes multiplied bytaken out of service for redevelopment; and
higher property net operating income of $9.1 million from other communities, primarily the effect of our increased ownership interest in the Palazzo communities from our June 2017 reacquisition of a 47% limited partner interest in the related joint venture.
As of December 31, 2017, as defined by our segment performance metrics, our Real Estate portfolio consisted of 90 Same Store apartment communitycommunities with 25,197 apartment homes and 32 Other Real Estate communities with 8,845 apartment homes.
As of December 31, 2017, our Other Real Estate communities included:
15 apartment communities with 6,386 apartment homes in redevelopment or development;
2 apartment communities with 578 apartment homes recently acquired; and
15 apartment communities with 1,881 apartment homes that do not meet the definition of Same Store because they are either subject to agreements that limit the amount by which we may increase rents or have not reached or maintained a stabilized level of occupancy as of the endbeginning of a two-year comparable period, often due to a casualty event.
Our Real Estate segment results for the years ended December 31, 2017 and 2016, as presented below, are based on the apartment community classifications as of December 31, 2017, and exclude amounts related to apartment communities sold or classified as held for sale during 2018. The results of operations for these communities are reflected in the comparable periods in the tables below.
 Year Ended December 31,
(in thousands)2017 2016 $ Change % Change
Rental and other property revenues before utility reimbursements:       
Same Store communities$547,912
 $530,619
 $17,293
 3.3%
Other Real Estate communities233,282
 189,683
 43,599
 23.0%
Total781,194
 720,302
 60,892
 8.5%
Property operating expenses, net of utility reimbursements:       
Same Store communities141,773
 140,007
 1,766
 1.3%
Other Real Estate communities80,958
 70,419
 10,539
 15.0%
Total222,731
 210,426
 12,305
 5.8%
Proportionate property net operating income:       
Same Store communities406,139
 390,612
 15,527
 4.0%
Other Real Estate communities152,324
 119,264
 33,060
 27.7%
Total$558,463
 $509,876
 $48,587
 9.5%
For the year ended December 31, 2017 compared to 2016, our Real Estate segment’s proportionate property net operating income increased $48.6 million, or 9.5%.
Same Store proportionate property net operating income increased by $15.5 million, or 4.0%. This increase was primarily attributable to a $17.3 million, or 3.3%, increase in rental and other property revenues due to higher average revenues of approximately $59 per effective home, comprised primarily of increases in rental rates. Renewal rents, which is the rent paid by an existing resident who renewed a lease compared to the rent paid prior to renewal, were up 4.6% for the year ended December 31, 2017, and new lease rents, which is the rent paid by a new resident compared to the rent paid by the previous resident of the current period.
Funds From Operationssame apartment home, were up 0.6%, resulting in a weighted average increase of 2.5%. The increase in Same Store rental and Adjusted Funds Fromother property revenues was partially offset by a $1.8 million, or 1.3%, increase in property operating expenses, primarily due to

increases in real estate taxes. During the year ended December 31, 2017 compared to 2016, controllable operating expenses, which exclude utility costs, real estate taxes and insurance, decreased by $1.6 million, or 2.1%.
The proportionate property net operating income of Other Real Estate communities increased by $33.1 million, or 27.7%, for the year ended December 31, 2017 compared to 2016 primarily due to:
redevelopment and lease-up activities during the year ended December 31, 2017, which helped contribute to incremental property net operating income of $20.9 million compared to 2016; and
higher property net operating income of $12.0 million from other communities, including the effect of our increased ownership interest in the Palazzo communities from our June 2017 reacquisition of the 47% limited partner interest in the related joint venture.
Non-Segment Real Estate Operations
Funds From Operations,Operating income amounts not attributed to our Real Estate segment include offsite costs associated with property management, casualty losses, and the results of apartment communities sold or FFO, is a non-GAAP financial measure thatheld for sale, reported in consolidated amounts, which we believe, when considered withdo not allocate to our Real Estate segment for purposes of evaluating segment performance, as described in Note 12 to the consolidated financial statements determined in accordance with GAAP, is helpful to investors in understanding our performance because it captures features particular to real estate performance by recognizing that real estate generally appreciates over time or maintains residual value to a much greater extent than do other depreciable assets such as machinery, computers or other personal property. The National Association of Real Estate Investment Trusts, or NAREIT, defines FFO as net income or loss computed in accordance with GAAP, excluding gains from sales of, and impairment losses recognized with respect to, depreciable property, plus depreciation and amortization, and after adjustments for unconsolidated partnerships and joint ventures. Adjustments for unconsolidated partnerships and joint ventures are calculated on the same basis to determine FFO. We calculate FFO attributable to Aimco common stockholders (diluted) by subtracting, if dilutive, redemption or repurchase related preferred stock issuance costs and dividends on preferred stock, and adding back dividends/distributions on dilutive preferred securities and premiums or discounts on preferred stock redemptions or repurchases.Item 8.
In addition to FFO, we compute Pro forma FFO and Adjusted FFO, or AFFO, which are also non-GAAP financial measures that we believe are helpful to investors in understanding our performance. Pro forma FFO represents FFO attributable to Aimco common stockholders (diluted), excluding preferred equity redemption-related amounts (adjusted for noncontrolling interests). Preferred equity redemption-related amounts (gains or losses) are items that periodically affect our operating results and we exclude these items from our calculation of Pro forma FFO because such amounts are not representative of our operating performance. AFFO represents Pro forma FFO reduced by Capital Replacements (also adjusted for noncontrolling interests), which represents our estimation of the capital additions made to replace capital assets consumed during our ownership. When we make capital additions at an apartment community, we evaluate whether the additions enhance the value, profitability or useful life of an asset as compared to its condition at the time we purchased the asset. We classify as Capital Improvements those capital additions that meet these criteria and we classify as Capital Replacements those that do not. AFFO is a key financial indicator we use to evaluate our operational performance and is used to help determine the amounts of our dividend payments.
FFO, Pro forma FFO and AFFO should not be considered alternatives to net income (loss) or net cash flows from operating activities, as determined in accordance with GAAP, as indications of our performance or as measures of liquidity. Although we use these non-GAAP measures for comparability in assessing our performance against other REITs, not all REITs compute these same measures. Additionally, computation of AFFO is subject to definitions of capital spending, which are subjective. Accordingly, there can be no assurance that our basis for computing these non-GAAP measures is comparable with that of other REITs.

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For the years ended December 31, 2015, 20142018, 2017 and 2013, Aimco’s FFO, Pro forma FFO2016, casualty losses totaled $4.0 million, $8.2 million and AFFO$5.6 million, respectively. Casualty losses during the year ended December 31, 2018 included several claims, primarily due to storm and fire damage, partially offset by recovery from insurance carriers for insured losses in excess of policy limits. Casualty losses were elevated during the year ended December 31, 2017, primarily due to hurricane damage.
For the years ended December 31, 2018, 2017 and 2016, apartment communities previously in our Real Estate portfolio that were sold or classified as held for sale generated net operating income of $22.3 million, $59.6 million and $79.7 million, respectively.
Asset Management Results
Prior to the July 2018 sale of our Asset Management business, we provided asset management and other services to certain consolidated partnerships owning apartment communities that qualify for low-income housing tax credits and are calculated as follows (in thousands):structured to provide for the pass-through of tax credits and tax deductions to their partners.
Contribution from Asset Management in our consolidated financial statements included: fees and other amounts paid to us from the net operating income of partnerships served by our Asset Management business, less interest expense incurred on non-recourse property debt obligations of the partnerships; income associated with delivery of tax credits to the third-party investors in the partnerships; and transactional revenue and other income less asset management expenses, which included certain allocated offsite costs related to the operation of this business.
 2015 2014 2013
Net income attributable to Aimco common stockholders (1)$235,966
 $300,220
 $203,673
Adjustments:     
Depreciation and amortization, net of noncontrolling partners’ interest298,880
 275,175
 282,235
Depreciation and amortization related to non-real estate assets, net of noncontrolling partners’ interest(10,269) (9,627) (11,273)
Gain on dispositions and other, net of income taxes and noncontrolling partners’ interest(173,694) (265,358) (19,321)
Provision for impairment losses related to depreciable real estate assets, net of noncontrolling partners’ interest655
 2,197
 
Discontinued operations:     
Gain on dispositions and depreciation of rental property, net of noncontrolling partners’ interest
 
 (152,567)
Common noncontrolling interests in Aimco Operating Partnership’s share of above adjustments (2)(5,548) (777) (5,346)
Amounts allocable to participating securities(473) (5) (377)
FFO attributable to Aimco common stockholders – diluted$345,517
 $301,825
 $297,024
Preferred equity redemption related amounts658
 
 
Pro forma FFO attributable to Aimco common stockholders – diluted$346,175
 $301,825
 $297,024
Capital Replacements, net of common noncontrolling interests in Aimco Operating Partnership and participating securities(53,925) (56,051) (75,067)
AFFO attributable to Aimco common stockholders – diluted$292,250
 $245,774
 $221,957
      
Weighted average common shares outstanding – diluted (FFO, Pro forma FFO and AFFO) (3)155,570
 146,002
 145,532
(1)
Represents the numerator for calculating Aimco’s earnings per common share in accordance with GAAP (see Note 13 to the consolidated financial statements in Item 8).
(2)
During the years ended December 31, 2015, 2014 and 2013, the Aimco Operating Partnership had outstanding 7,656,626, 7,723,822 and 7,965,431 common OP Units and equivalents.
(3)Represents the denominator for Aimco’s earnings per common share – diluted, calculated in accordance with GAAP, plus common share equivalents that are dilutive for FFO, Pro forma FFO and AFFO.
For the year ended December 31, 2015 as2018 compared to 2017, contribution from Asset Management decreased $19.3 million due to its July 2018 sale.
For the year ended December 31, 2017 compared to 2016, contribution from Asset Management decreased $8.8 million due to decreases in tax credit income as the result of delivering final credits and acquiring certain partners’ interests in the partnerships, as well as transactional revenues.
Depreciation and Amortization
For the year ended December 31, 2018 compared to 2017, depreciation and amortization expense increased by $11.6 million primarily due to apartment homes acquired in 2018 and renovated apartment homes placed in service after their completion, partially offset by decreases associated with apartment communities sold.
For the year ended December 31, 2017 compared to 2016, depreciation and amortization expense increased by $33.1 million primarily due to renovated apartment homes placed in service after their completion, a full year of depreciation following the 2016 completion of our One Canal development and 2016 acquisition of Indigo, and other capital additions, partially offset by decreases associated with apartment communities sold.
General and Administrative Expenses
In recent years, we have worked toward simplifying our business, including the sale of our Asset Management Business, which allowed us to reduce overhead and other costs. This simplification and our scale reductions have allowed us to reduce our offsite

costs, which consist of general and administrative expenses, property management expenses and investment management expenses, by $6.4 million, or 8.6%, over the last three years.
For the year ended December 31, 2018 compared to 2017, general and administrative expenses increased $2.6 million, primarily due to higher variable incentive compensation cost.
For the year ended December 31, 2017 compared to 2016, general and administrative expenses decreased $3.1 million, primarily due to lower personnel and related costs including incentive compensation, professional services, technology costs and other corporate costs.
Other Expenses, Net
Other expenses, net includes costs associated with our risk management activities, partnership administration expenses and certain non-recurring items.
For the year ended December 31, 2018 compared to 2017, other expenses, net decreased by $7.4 million, primarily due to the resolution of our litigation against Airbnb, and settlement of litigation related to the challenge to the title of the La Jolla Cove property which we acquired in 2014.
For the year ended December 31, 2017 compared to 2016, other expenses, net decreased by $3.1 million. The decrease was primarily due to the 2016 recognition of estimated future environmental clean-up and abatement costs associated with the matters discussed in Note 5 to the consolidated financial statements in Item 8, partially offset by legal costs we incurred related to a challenge to the title of the La Jolla Cove property.
Provision for Real Estate Impairment Loss
We recognized no provisions for impairment losses during the years ended December 31, 2018 or 2016.
During the year ended December 31, 2018, we agreed to sell our interests in the entities owning the La Jolla Cove property in settlement of legal actions filed in 2014 Pro forma FFO increased 8% (onby a diluted per share basis) primarily asgroup of disappointed buyers who had hoped to acquire the property. As a result of improvedthe settlement, we recognized in our 2017 results a gross impairment loss of $35.8 million, $25.6 million of which related to the establishment of a deferred tax liability assumed in connection with our acquisition of the business entities. The tax liability was assumed by the buyer, resulting in no economic loss to us. The remaining $10.2 million loss was offset by cash distributions paid to us during our ownership and avoided legal costs for continued litigation. On an economic basis, we agreed to sell these entities at roughly our purchase price, adjusted for retained cash distributions and avoided legal costs.
Interest Income
For the year ended December 31, 2018 compared to 2017, interest income increased $2.6 million, primarily due to interest earned on the seller financing notes received as consideration in the sale of the La Jolla Cove property.
Interest Expense
For the year ended December 31, 2018 compared to 2017, interest expense, which includes the amortization of debt issuance costs and amortization of deferred financing costs, increased by $6.0 million, or 3.1%. The increase was primarily due to debt prepayment penalties of $14.9 million incurred in connection with 2018 property-level debt refinancing activity undertaken to refinance property-level debt that was scheduled to mature in 2019, 2020, and 2021, partially offset by a decrease in mortgage interest expense for communities sold and the sale of the Asset Management business in July 2018, and lower corporate-level interest.
For the year ended December 31, 2017 compared to 2016, interest expense decreased by $1.8 million, or 0.9%. The decrease was primarily due to lower average outstanding balances on non-recourse property operating resultsdebt for our Real Estate apartment communities and increased contribution fromlower interest rates, resulting in an $11.9 million reduction in interest expense. These decreases were partially offset by higher amounts outstanding on corporate borrowings (including our term loan and incremental line borrowings used to temporarily fund the reacquisition of the Palazzo limited partner interests) and a decrease in capitalized interest associated with our redevelopment and acquisition communities, offset bydevelopment activities.
Other, Net
Other, net includes our equity in the income or loss of income fromunconsolidated real estate partnerships, and the results of operations related to the NAPICO business, which we accounted for under the profit sharing method prior to the derecognition of the final property during 2017.

For the year ended December 31, 2018 compared to 2017, other, net decreased by $7.4 million, primarily due to the derecognition of the final NAPICO property in 2017, which resulted in a gain. For the year ended December 31, 2017 compared to 2016, other, net increased by $2.1 million, also attributed to gain recognized upon the derecognition of a NAPICO property.
Gain on Dispositions of Real Estate
The table below summarizes dispositions of apartment communities from our Real Estate portfolio during the years ended 2018, 2017 and 2016 (dollars in millions):
  December 31,
  2018 2017 2016
Real Estate      
Number of apartment communities sold 4
 5
 7
Gross proceeds $242.3
 $397.0
 $517.0
Net proceeds (1) $235.7
 $385.3
 $511.0
Gain on disposition $175.2
 $297.9
 $383.6
(1)Net proceeds are after repayment of debt, if any, net working capital settlements, payment of transaction costs and debt prepayment penalties, if applicable.
The apartment communities sold from our Real Estate portfolio during 2018, 2017 and 2016 were primarily located outside of our primary markets or in lower-rated locations within our primary markets and had average revenues per apartment home significantly below those of our retained portfolio.
During the year ended December 31, 2018, we sold for $590 million our Asset Management business and our four Hunters Point communities. Please refer to Note 3 to the consolidated financial statements in Item 8 for further details regarding this sale.
Income Tax Benefit
Certain of our operations, including property management and risk management, are conducted through taxable REIT subsidiaries, or TRS entities. Additionally, some of our apartment communities are owned through TRS entities.
Our income tax benefit calculated in accordance with GAAP includes: (a) income taxes associated with the income or loss of our TRS entities, for which the tax consequences have been realized or will be realized in future periods; (b) low income housing tax credits generated prior to the sale of our Asset Management business that were sold. offset REIT taxable income, primarily from retained capital gains; and (c) historic tax credits that offset income tax obligations of our TRS entities. Income taxes related to these items, as well as changes in valuation allowance and the establishment of incremental deferred tax items in conjunction with intercompany asset transfers (if applicable), are included in income tax benefit in our consolidated statements of operations.
For the same period, AFFO increased 12% (onyear ended December 31, 2018 compared to 2017, income tax benefit decreased by $17.8 million, from $30.8 million to $13.0 million. The decrease is primarily due to the reversal of a diluted per share basis),$19.3 million net tax benefit we recognized as a result of the Pro forma FFO growth as well as a decreaseDecember 2017 tax reform legislation in Capital Replacements spending as a percentage2017 (as further discussed in Note 9 to the consolidated financial statements in Item 8) and higher tax expense related to gains on sale of real estate for communities held through TRS entities.
For the year ended December 31, 2017 compared to 2016, income tax benefit increased by $12.0 million, from $18.8 million to $30.8 million. The increase is primarily due to lower tax expense on the gains of sale of apartment communities, higher net operating losses at the TRS entities (including the La Jolla Cove impairment loss discussed above), higher tax benefit associated with low-income housing tax credits, and the $0.5 million net tax benefit we recognized for December 2017 tax reform legislation (as further discussed in Note 9 to the consolidated financial statements in Item 8).
Noncontrolling Interests in Consolidated Real Estate Partnerships
Noncontrolling interests in consolidated real estate partnerships reflects the results of our consolidated real estate partnerships allocated to the owners who are not affiliated with Aimco. The amounts of income or loss of our consolidated real estate partnerships that we allocate to owners not affiliated with Aimco include their share of property management fees, interest on notes and other amounts that we charge to these partnerships.
For the years ended December 31, 2018, 2017 and 2016, we allocated net income of $8.2 million, $9.1 million, and $25.3 million, respectively, to noncontrolling interests in consolidated real estate partnerships. The amount of net operating income. As we concentrate our investment capital in higher quality, higher price-pointincome allocated to noncontrolling interests was driven by three primary factors: the operations of the consolidated apartment communities; gains on

the sale of apartment communities our free cash flow margins are increasingwith noncontrolling interest holders; and contributingthe results of operations of the NAPICO business, as further discussed below.
The amount of net income allocated to higher AFFO. Refernoncontrolling interests resulting from operations of the consolidated apartment communities was $0.3 million, $2.4 million and $4.4 million for the years ended December 31, 2018, 2017 and 2016.
Gains on the sale of apartment communities allocated to noncontrolling interests totaled $7.9 million, $7.3 million and $13.0 million for the years ended December 31, 2018, 2017 and 2016, respectively.
We derecognized the NAPICO business in two transactions, which occurred in 2017 and 2016. We allocated an $8.1 million gain on sale and a $0.6 million net loss, respectively, to the Liquiditynoncontrolling interest holders in connection with the 2017 and Capital Resources section for further information regarding our Capital Replacements2016 transactions.
Net Income Attributable to Aimco Preferred Stockholders and other capital investing activities.the Aimco Operating Partnership’s Preferred Unitholders
TheNet income attributable to Aimco preferred stockholders and the Aimco Operating Partnership’s preferred unitholders decreased by $3.4 million and $2.9 million, respectively, during the year ended December 31, 2017 as compared to 2016. These decreases were primarily due to Aimco’s redemption of its Class Z Preferred Stock in 2016.
Noncontrolling Interests in Aimco Operating Partnership
In Aimco’s consolidated financial statements, noncontrolling interests in the Aimco Operating Partnership does not separately compute or report FFO, Pro forma FFO or AFFO. However, based on Aimco’s method for allocationreflects the results of amounts of FFO, Pro forma FFO and AFFOthe Aimco Operating Partnership that are allocated to the OP Unit holders. Allocations to noncontrolling interests in the Aimco Operating Partnership as well as the limited differences between Aimco’s and the Aimco Operating Partnership’sfluctuate in proportion to variations in net income, amounts duringas described above. For the periods presented, FFO, Pro forma FFO and AFFO amounts on a per unit basis foryear ended December 31, 2018 compared to 2017, net income allocated to noncontrolling interests in the Aimco Operating Partnership would be expectedincreased $20.0 million primarily due to be substantially the sameincrease in net income, as well as an increase in the corresponding per share amountspercentage allocated following the issuance of OP Units as partial consideration for Aimco.the acquisition of the four Philadelphia properties, discussed further in Note 3 to the consolidated financial statements. Net income allocated to noncontrolling interests in the Aimco Operating Partnership for the year ended December 31, 2017 decreased $5.9 million as compared to 2016 due to the decrease in net income between the periods.
Leverage Ratios
We target the ratio of Proportionate Debt and Preferred Equity to Adjusted EBITDA to be below 7.0x and we target the ratio of Adjusted EBITDA to Adjusted Interest Expense and Preferred Dividends to be greater than 2.5x. Our leverage ratios for the three months ended December 31, 2018, are presented below:
Proportionate Debt to Adjusted EBITDA6.8x
Proportionate Debt and Preferred Equity to Adjusted EBITDA7.2x
Adjusted EBITDA to Adjusted Interest Expense3.8x
Adjusted EBITDA to Adjusted Interest Expense and Preferred Dividends3.4x
Our Adjusted EBITDA has been calculated on a pro forma basis to adjust for significant items impacting the three months ended December 31, 2018 for which annualization would distort the results. Leverage ratios are elevated by 0.5x due to the use of debt to fund temporarily the Aimco common share repurchases completed during the three months ended December 31, 2018. We intend to reduce our Proportionate Debt and Preferred Equity to Adjusted EBITDA to 6.9x by the end of 2019 from earnings growth, primarily due to increasing contribution from Same Store apartment communities and reduction of debt balances due to regularly-scheduled debt amortization and apartment community sales, partially offset by the loss of earnings from communities sold. As used in the ratios above, Preferred Equity represents Aimco’s preferred stock and the Aimco Operating Partnership’s preferred OP units.
Refinancing Activity
During the year ended December 31, 2018, we addressed approximately half of our property loans maturing in 2019, 2020, and 2021. We placed $867.4 million of new loans, $740.4 million of fixed-rate loans at a weighted average interest rate of 4.20% and a weighted average term of 9.3 years, and $127.0 million of variable-rate loans with rates floating at 115 basis points over 30-day LIBOR and a weighted average term of 5.1 years. This refinancing activity results in an annual interest savings of $13.0 million.
Liquidity
Our liquidity consists of cash balances and available capacity on our revolving line of credit. During the year ended December 31, 2018, we exercised our option to expand our revolving credit facility by $200.0 million, bringing the total borrowing capacity to $800.0 million. As of December 31, 2018, we had cash and restricted cash of $72.6 million and had the capacity to borrow up to $632.5 million on our revolving credit facility, after consideration of $7.1 million letters of credit backed by the facility. We use our credit facility primarily for working capital and other short-term purposes and to secure letters of credit.
We manage our financial flexibility by maintaining an investment grade rating and holding apartment communities that are unencumbered by property debt. At December 31, 2018, we held unencumbered apartment communities with an estimated fair market value of approximately $2.7 billion, up 50% from December 31, 2017.
Two credit rating agencies rate our creditworthiness, using different methodologies and ratios for assessing our credit, and both have rated our credit and outlook as BBB- (stable), an investment grade rating. Although some of the ratios they use are similar to those we use to measure our leverage, there are differences in our methods of calculation and therefore our leverage ratios disclosed above are not indicative of the ratios that may be calculated by these agencies.

Equity Capital Activities
During the year ended December 31, 2018, we repurchased 8.7 million shares of common stock, of which 0.5 million settled in January 2019, all for $394.1 million, at a weighted average price of $45.33 per share, approximately a 20% discount to our published NAV per share. Approximately half of the repurchases were funded with proceeds from 2018 and January 2019 property sales at a premium to the values ascribed to these communities in our published NAV. The remaining half of repurchases are temporarily funded with borrowings on our credit facility. We expect to repay these borrowings with proceeds from the sale of communities now under contract, again at prices greater than those used in our published NAV. With the completion of these transactions, we will have increased NAV by an estimated $0.67 per share.
The 2019 property sales necessary to fund our share repurchases are expected to generate taxable gains of $285 million, which is in excess of our regular quarterly dividend. Accordingly, on February 3, 2019, Aimco’s Board of Directors declared a special dividend on the common stock that consists of $67.1 million in cash and 4.5 million shares of common stock. The special dividend will be payable on March 22, 2019, to stockholders of record as of February 22, 2019. The special dividend also includes the regular quarterly cash dividend, which for 2019 is expected to be $0.39 per share, which represents an increase of 3% compared to cash dividends paid during 2018.
Stockholders will have the opportunity to elect to receive the special dividend in the form of all cash or all stock, subject to proration if either option is oversubscribed. Based on Aimco’s closing share price on February 15, 2019, we estimate the aggregate value of the special dividend to be approximately $290.3 million. However, the actual value will vary depending on the price of Aimco common stock on the dividend valuation dates (March 11 and 12, 2019).
In order to neutralize the dilutive impact of the stock issued in the special dividend, Aimco’s Board also authorized a reverse stock split, effective on February 20, 2019. As a result, total shares outstanding following completion of both the special dividend and the reverse stock split are expected to be unchanged from the total shares outstanding immediately prior to the transactions. Some stockholders may have more Aimco shares and some may have fewer based on their individual elections. The reverse split will facilitate comparability of Aimco per share results before and after these transactions.
In aggregate, these transactions:
Increase NAV per share by 1%;
Do not affect Aimco’s regular quarterly cash dividend;
Reduce the number of Aimco shares outstanding by 6% (as a result of the share repurchases);
Minimize the aggregate tax paid by Aimco and its stockholders;
Are leverage neutral; and
Result in no change in the number of shares outstanding (as a result of the special dividend and the reverse stock split), thereby improving comparability of per share results.
Team and Culture
Our team and culture are keys to our success. Our intentional focus on a collaborative and productive culture based on respect for others and personal responsibility is reinforced by a preference for promotion from within based on succession planning and talent development to produce a strong, stable team that is the enduring foundation of our success. In 2018, we were recognized by the Denver Post as a Top Work Place for the sixth consecutive year, an accomplishment shared with only seven other companies in Colorado.
Key Financial Indicators
The key financial indicators that we use in managing our business and in evaluating our operating performance are Economic Income, our measure of long-term total return, and AFFO, our measure of current return. In addition to these indicators, we evaluate our operating performance and financial condition using: Pro forma FFO; Free Cash Flow; Same Store property net operating income; proportionate property net operating income; average revenue per effective apartment home; leverage ratios; and net leverage.

Results of Operations
Because our operating results depend primarily on income from our apartment communities, the supply of and demand for apartments influences our operating results. Additionally, the level of expenses required to operate and maintain our apartment communities and the pace and price at which we redevelop, acquire and dispose of our apartment communities affect our operating results.
The following discussion and analysis of the results of our operations and financial condition should be read in conjunction with the accompanying consolidated financial statements in Item 8.
Overview
2018 compared to2017
Net income attributable to Aimco and net income attributable to the Aimco Operating Partnership increased by $350.5 million and $370.4 million, respectively, for the year ended December 31, 2018 as compared to 2017. The increase in income was primarily due to an increase in gain on dispositions of real estate, including the 2018 sale of our Asset Management business, and results of operations described more fully below, partially offset by an increase in depreciation and amortization resulting from redeveloped and developed apartment homes placed into service.

2017 compared to2016
Net income attributable to Aimco and net income attributable to the Aimco Operating Partnership decreased by $114.6 million and $120.0 million, respectively, for the year ended December 31, 2017 as compared to 2016. The decrease in income was principally due to a decrease in gain on dispositions of real estate and an increase in depreciation and amortization resulting from redeveloped apartment homes placed into service and the completion of One Canal and the acquisition of Indigo in 2016, partially offset by improved operating results.
The following paragraphs discuss these and other items affecting the results of operations of Aimco and the Aimco Operating Partnership in more detail.
Property Operations
As described under the preceding Executive Overview heading, we have a single reportable segment, Real Estate, which consists of market rate apartment communities in which we hold a substantial equity ownership interest.
We use proportionate property net operating income to assess the operating performance of our Real Estate portfolio. Proportionate property net operating income reflects our share of rental and other property revenues, excluding resident utility reimbursement, less direct property operating expenses, net of resident utility reimbursement, and including real estate taxes, for consolidated apartment communities we manage. Accordingly, the results of operations of our Real Estate segment discussed below are presented on a proportionate basis and exclude the results of four apartment communities with 142 apartment homes that we neither manage nor consolidate. Beginning in 2018, our segment results below reflect utility reimbursements as a reduction of the corresponding expense. We have revised the 2017 and 2016 amounts to conform to this presentation.
We do not include offsite costs associated with property management or casualty-related amounts in our assessment of segment performance. Accordingly, these items are not allocated to our segment results discussed below.
Refer to Note 12 to the consolidated financial statements in Item 8 for further discussion regarding our reportable segment, including a reconciliation of these proportionate amounts to consolidated rental and other property revenues and property operating expenses.
Real Estate Proportionate Property Net Operating Income
We classify apartment communities within our Real Estate segment as Same Store and Other Real Estate. Same Store communities are those that have reached a stabilized level of operations as of the beginning of a two-year comparable period and maintained it throughout the current and comparable prior year, and are not expected to be sold within 12 months. Other Real Estate includes apartment communities that do not meet the Same Store definition, including, but not limited to: redevelopment and development apartment communities, which are those currently under construction that have not achieved a stabilized level of operations and those that have been completed in recent years that have not achieved and maintained stabilized operations for both the current and comparable prior year; acquisition apartment communities, which are those we have acquired since the beginning of a two-year comparable period; and communities that we expect to sell within 12 months but do not yet meet the criteria to be classified as held for sale.

As of December 31, 2018, our Real Estate segment consisted of 93 Same Store communities with 25,905 apartment homes and 35 Other Real Estate communities with 9,720 apartment homes.
From December 31, 2017 to December 31, 2018, on a net basis, our Same Store portfolio increased by one community and decreased by 481 apartment homes. These changes consisted of:
the addition of one developed apartment community with 91 apartment homes and one redeveloped apartment community with 104 apartment homes that were classified as Same Store upon maintaining stabilized operations for the entirety of the periods presented;
the addition of one acquired apartment community with 115 apartment homes that was classified as Same Store because we have now owned it for the entirety of the periods presented;
the addition of one apartment community with 492 apartment homes which we no longer expect to sell within 12 months;
the reduction of one apartment community with 821 apartment homes sold during the period;
the reduction of one apartment community with 94 apartment homes we expect to sell during 2019; and
the reduction of one apartment community with 368 apartment homes classified as held for sale at December 31, 2018.
As of December 31, 2018, our Other Real Estate communities included:
13 apartment communities with 6,294 apartment homes in redevelopment or development;
7 apartment communities with 1,943 apartment homes recently acquired; and
15 apartment communities with 1,483 apartment homes that do not meet the definition of Same Store because they are either subject to agreements that limit the amount by which we may increase rents or have not reached or maintained a stabilized level of occupancy as of the beginning of a two-year comparable period, often due to a casualty event.
Our Real Estate segment results for the years ended December 31, 2018 and 2017, as presented below, are based on the apartment community classifications as of December 31, 2018.
 Year Ended December 31,
(in thousands)2018 2017 $ Change % Change
Rental and other property revenues before utility reimbursements:       
Same Store communities$580,536
 $563,040
 $17,496
 3.1%
Other Real Estate communities273,704
 218,154
 55,550
 25.5%
Total854,240
 781,194
 73,046
 9.4%
Property operating expenses, net of utility reimbursements:       
Same Store communities150,042
 145,301
 4,741
 3.3%
Other Real Estate communities88,818
 77,430
 11,388
 14.7%
Total238,860
 222,731
 16,129
 7.2%
Proportionate property net operating income:       
Same Store communities430,494
 417,739
 12,755
 3.1%
Other Real Estate communities184,886
 140,724
 44,162
 31.4%
Total$615,380
 $558,463
 $56,917
 10.2%
For the year ended December 31, 2018 compared to 2017, our Real Estate segment’s proportionate property net operating income increased $56.9 million, or 10.2%.
Same Store proportionate property net operating income increased by $12.8 million, or 3.1%. This increase was primarily attributable to a $17.5 million, or 3.1%, increase in rental and other property revenues due to higher average monthly revenues of $50 per Aimco apartment home comprised of increases in rental rates and a 50 basis point increase in average daily occupancy. Renewal rents, which is the rent paid by an existing resident who renewed a lease compared to the rent paid prior to renewal, were up 4.5% for the year ended December 31, 2018, and new lease rents, which is the rent paid by a new resident compared to the rent paid by the previous resident of the same apartment home, were up 1.5%, resulting in a weighted average increase of 3.0%. The increase in Same Store rental and other property revenues was partially offset by a $4.7 million, or 3.3%, increase in property operating expenses, primarily due to increases in real estate taxes and repairs and maintenance costs. During the year ended

December 31, 2018 compared to 2017, controllable operating expenses, which exclude utility costs, real estate taxes and insurance, increased by $1.5 million, or 2.0%.
The proportionate property net operating income of Other Real Estate communities increased by $44.2 million, or 31.4%, for the year ended December 31, 2018 compared to 2017 primarily due to:
a $24.1 million increase in property net operating income due to the 2018 acquisition of the four Philadelphia communities, Bent Tree Apartments and Avery Row, as well as the stabilization of Indigo;
an $11.0 million increase in property net operating income due to leasing activities at redevelopment and development communities, partially offset by decreases due to apartment homes taken out of service for redevelopment; and
higher property net operating income of $9.1 million from other communities, primarily the effect of our increased ownership interest in the Palazzo communities from our June 2017 reacquisition of a 47% limited partner interest in the related joint venture.
As of December 31, 2017, as defined by our segment performance metrics, our Real Estate portfolio consisted of 90 Same Store apartment communities with 25,197 apartment homes and 32 Other Real Estate communities with 8,845 apartment homes.
As of December 31, 2017, our Other Real Estate communities included:
15 apartment communities with 6,386 apartment homes in redevelopment or development;
2 apartment communities with 578 apartment homes recently acquired; and
15 apartment communities with 1,881 apartment homes that do not meet the definition of Same Store because they are either subject to agreements that limit the amount by which we may increase rents or have not reached or maintained a stabilized level of occupancy as of the beginning of a two-year comparable period, often due to a casualty event.
Our Real Estate segment results for the years ended December 31, 2017 and 2016, as presented below, are based on the apartment community classifications as of December 31, 2017, and exclude amounts related to apartment communities sold or classified as held for sale during 2018. The results of operations for these communities are reflected in the comparable periods in the tables below.
 Year Ended December 31,
(in thousands)2017 2016 $ Change % Change
Rental and other property revenues before utility reimbursements:       
Same Store communities$547,912
 $530,619
 $17,293
 3.3%
Other Real Estate communities233,282
 189,683
 43,599
 23.0%
Total781,194
 720,302
 60,892
 8.5%
Property operating expenses, net of utility reimbursements:       
Same Store communities141,773
 140,007
 1,766
 1.3%
Other Real Estate communities80,958
 70,419
 10,539
 15.0%
Total222,731
 210,426
 12,305
 5.8%
Proportionate property net operating income:       
Same Store communities406,139
 390,612
 15,527
 4.0%
Other Real Estate communities152,324
 119,264
 33,060
 27.7%
Total$558,463
 $509,876
 $48,587
 9.5%
For the year ended December 31, 2017 compared to 2016, our Real Estate segment’s proportionate property net operating income increased $48.6 million, or 9.5%.
Same Store proportionate property net operating income increased by $15.5 million, or 4.0%. This increase was primarily attributable to a $17.3 million, or 3.3%, increase in rental and other property revenues due to higher average revenues of approximately $59 per effective home, comprised primarily of increases in rental rates. Renewal rents, which is the rent paid by an existing resident who renewed a lease compared to the rent paid prior to renewal, were up 4.6% for the year ended December 31, 2017, and new lease rents, which is the rent paid by a new resident compared to the rent paid by the previous resident of the same apartment home, were up 0.6%, resulting in a weighted average increase of 2.5%. The increase in Same Store rental and other property revenues was partially offset by a $1.8 million, or 1.3%, increase in property operating expenses, primarily due to

increases in real estate taxes. During the year ended December 31, 2017 compared to 2016, controllable operating expenses, which exclude utility costs, real estate taxes and insurance, decreased by $1.6 million, or 2.1%.
The proportionate property net operating income of Other Real Estate communities increased by $33.1 million, or 27.7%, for the year ended December 31, 2017 compared to 2016 primarily due to:
redevelopment and lease-up activities during the year ended December 31, 2017, which helped contribute to incremental property net operating income of $20.9 million compared to 2016; and
higher property net operating income of $12.0 million from other communities, including the effect of our increased ownership interest in the Palazzo communities from our June 2017 reacquisition of the 47% limited partner interest in the related joint venture.
Non-Segment Real Estate Operations
Operating income amounts not attributed to our Real Estate segment include offsite costs associated with property management, casualty losses, and the results of apartment communities sold or held for sale, reported in consolidated amounts, which we do not allocate to our Real Estate segment for purposes of evaluating segment performance, as described in Note 12 to the consolidated financial statements in Item 8.
For the years ended December 31, 2018, 2017 and 2016, casualty losses totaled $4.0 million, $8.2 million and $5.6 million, respectively. Casualty losses during the year ended December 31, 2018 included several claims, primarily due to storm and fire damage, partially offset by recovery from insurance carriers for insured losses in excess of policy limits. Casualty losses were elevated during the year ended December 31, 2017, primarily due to hurricane damage.
For the years ended December 31, 2018, 2017 and 2016, apartment communities previously in our Real Estate portfolio that were sold or classified as held for sale generated net operating income of $22.3 million, $59.6 million and $79.7 million, respectively.
Asset Management Results
Prior to the July 2018 sale of our Asset Management business, we provided asset management and other services to certain consolidated partnerships owning apartment communities that qualify for low-income housing tax credits and are structured to provide for the pass-through of tax credits and tax deductions to their partners.
Contribution from Asset Management in our consolidated financial statements included: fees and other amounts paid to us from the net operating income of partnerships served by our Asset Management business, less interest expense incurred on non-recourse property debt obligations of the partnerships; income associated with delivery of tax credits to the third-party investors in the partnerships; and transactional revenue and other income less asset management expenses, which included certain allocated offsite costs related to the operation of this business.
For the year ended December 31, 2018 compared to 2017, contribution from Asset Management decreased $19.3 million due to its July 2018 sale.
For the year ended December 31, 2017 compared to 2016, contribution from Asset Management decreased $8.8 million due to decreases in tax credit income as the result of delivering final credits and acquiring certain partners’ interests in the partnerships, as well as transactional revenues.
Depreciation and Amortization
For the year ended December 31, 2018 compared to 2017, depreciation and amortization expense increased by $11.6 million primarily due to apartment homes acquired in 2018 and renovated apartment homes placed in service after their completion, partially offset by decreases associated with apartment communities sold.
For the year ended December 31, 2017 compared to 2016, depreciation and amortization expense increased by $33.1 million primarily due to renovated apartment homes placed in service after their completion, a full year of depreciation following the 2016 completion of our One Canal development and 2016 acquisition of Indigo, and other capital additions, partially offset by decreases associated with apartment communities sold.
General and Administrative Expenses
In recent years, we have worked toward simplifying our business, including the sale of our Asset Management Business, which allowed us to reduce overhead and other costs. This simplification and our scale reductions have allowed us to reduce our offsite

costs, which consist of general and administrative expenses, property management expenses and investment management expenses, by $6.4 million, or 8.6%, over the last three years.
For the year ended December 31, 2018 compared to 2017, general and administrative expenses increased $2.6 million, primarily due to higher variable incentive compensation cost.
For the year ended December 31, 2017 compared to 2016, general and administrative expenses decreased $3.1 million, primarily due to lower personnel and related costs including incentive compensation, professional services, technology costs and other corporate costs.
Other Expenses, Net
Other expenses, net includes costs associated with our risk management activities, partnership administration expenses and certain non-recurring items.
For the year ended December 31, 2018 compared to 2017, other expenses, net decreased by $7.4 million, primarily due to the resolution of our litigation against Airbnb, and settlement of litigation related to the challenge to the title of the La Jolla Cove property which we acquired in 2014.
For the year ended December 31, 2017 compared to 2016, other expenses, net decreased by $3.1 million. The decrease was primarily due to the 2016 recognition of estimated future environmental clean-up and abatement costs associated with the matters discussed in Note 5 to the consolidated financial statements in Item 8, partially offset by legal costs we incurred related to a challenge to the title of the La Jolla Cove property.
Provision for Real Estate Impairment Loss
We recognized no provisions for impairment losses during the years ended December 31, 2018 or 2016.
During the year ended December 31, 2018, we agreed to sell our interests in the entities owning the La Jolla Cove property in settlement of legal actions filed in 2014 by a group of disappointed buyers who had hoped to acquire the property. As a result of the settlement, we recognized in our 2017 results a gross impairment loss of $35.8 million, $25.6 million of which related to the establishment of a deferred tax liability assumed in connection with our acquisition of the business entities. The tax liability was assumed by the buyer, resulting in no economic loss to us. The remaining $10.2 million loss was offset by cash distributions paid to us during our ownership and avoided legal costs for continued litigation. On an economic basis, we agreed to sell these entities at roughly our purchase price, adjusted for retained cash distributions and avoided legal costs.
Interest Income
For the year ended December 31, 2018 compared to 2017, interest income increased $2.6 million, primarily due to interest earned on the seller financing notes received as consideration in the sale of the La Jolla Cove property.
Interest Expense
For the year ended December 31, 2018 compared to 2017, interest expense, which includes the amortization of debt issuance costs and amortization of deferred financing costs, increased by $6.0 million, or 3.1%. The increase was primarily due to debt prepayment penalties of $14.9 million incurred in connection with 2018 property-level debt refinancing activity undertaken to refinance property-level debt that was scheduled to mature in 2019, 2020, and 2021, partially offset by a decrease in mortgage interest expense for communities sold and the sale of the Asset Management business in July 2018, and lower corporate-level interest.
For the year ended December 31, 2017 compared to 2016, interest expense decreased by $1.8 million, or 0.9%. The decrease was primarily due to lower average outstanding balances on non-recourse property debt for our Real Estate apartment communities and lower interest rates, resulting in an $11.9 million reduction in interest expense. These decreases were partially offset by higher amounts outstanding on corporate borrowings (including our term loan and incremental line borrowings used to temporarily fund the reacquisition of the Palazzo limited partner interests) and a decrease in capitalized interest associated with our redevelopment and development activities.
Other, Net
Other, net includes our equity in the income or loss of unconsolidated real estate partnerships, and the results of operations related to the NAPICO business, which we accounted for under the profit sharing method prior to the derecognition of the final property during 2017.

For the year ended December 31, 2018 compared to 2017, other, net decreased by $7.4 million, primarily due to the derecognition of the final NAPICO property in 2017, which resulted in a gain. For the year ended December 31, 2017 compared to 2016, other, net increased by $2.1 million, also attributed to gain recognized upon the derecognition of a NAPICO property.
Gain on Dispositions of Real Estate
The table below summarizes dispositions of apartment communities from our Real Estate portfolio during the years ended 2018, 2017 and 2016 (dollars in millions):
  December 31,
  2018 2017 2016
Real Estate      
Number of apartment communities sold 4
 5
 7
Gross proceeds $242.3
 $397.0
 $517.0
Net proceeds (1) $235.7
 $385.3
 $511.0
Gain on disposition $175.2
 $297.9
 $383.6
(1)Net proceeds are after repayment of debt, if any, net working capital settlements, payment of transaction costs and debt prepayment penalties, if applicable.
The apartment communities sold from our Real Estate portfolio during 2018, 2017 and 2016 were primarily located outside of our primary markets or in lower-rated locations within our primary markets and had average revenues per apartment home significantly below those of our retained portfolio.
During the year ended December 31, 2018, we sold for $590 million our Asset Management business and our four Hunters Point communities. Please refer to Note 3 to the consolidated financial statements in Item 8 for further details regarding this sale.
Income Tax Benefit
Certain of our operations, including property management and risk management, are conducted through taxable REIT subsidiaries, or TRS entities. Additionally, some of our apartment communities are owned through TRS entities.
Our income tax benefit calculated in accordance with GAAP includes: (a) income taxes associated with the income or loss of our TRS entities, for which the tax consequences have been realized or will be realized in future periods; (b) low income housing tax credits generated prior to the sale of our Asset Management business that offset REIT taxable income, primarily from retained capital gains; and (c) historic tax credits that offset income tax obligations of our TRS entities. Income taxes related to these items, as well as changes in valuation allowance and the establishment of incremental deferred tax items in conjunction with intercompany asset transfers (if applicable), are included in income tax benefit in our consolidated statements of operations.
For the year ended December 31, 2018 compared to 2017, income tax benefit decreased by $17.8 million, from $30.8 million to $13.0 million. The decrease is primarily due to the reversal of a $19.3 million net tax benefit we recognized as a result of the December 2017 tax reform legislation in 2017 (as further discussed in Note 9 to the consolidated financial statements in Item 8) and higher tax expense related to gains on sale of real estate for communities held through TRS entities.
For the year ended December 31, 2017 compared to 2016, income tax benefit increased by $12.0 million, from $18.8 million to $30.8 million. The increase is primarily due to lower tax expense on the gains of sale of apartment communities, higher net operating losses at the TRS entities (including the La Jolla Cove impairment loss discussed above), higher tax benefit associated with low-income housing tax credits, and the $0.5 million net tax benefit we recognized for December 2017 tax reform legislation (as further discussed in Note 9 to the consolidated financial statements in Item 8).
Noncontrolling Interests in Consolidated Real Estate Partnerships
Noncontrolling interests in consolidated real estate partnerships reflects the results of our consolidated real estate partnerships allocated to the owners who are not affiliated with Aimco. The amounts of income or loss of our consolidated real estate partnerships that we allocate to owners not affiliated with Aimco include their share of property management fees, interest on notes and other amounts that we charge to these partnerships.
For the years ended December 31, 2018, 2017 and 2016, we allocated net income of $8.2 million, $9.1 million, and $25.3 million, respectively, to noncontrolling interests in consolidated real estate partnerships. The amount of net income allocated to noncontrolling interests was driven by three primary factors: the operations of the consolidated apartment communities; gains on

the sale of apartment communities with noncontrolling interest holders; and the results of operations of the NAPICO business, as further discussed below.
The amount of net income allocated to noncontrolling interests resulting from operations of the consolidated apartment communities was $0.3 million, $2.4 million and $4.4 million for the years ended December 31, 2018, 2017 and 2016.
Gains on the sale of apartment communities allocated to noncontrolling interests totaled $7.9 million, $7.3 million and $13.0 million for the years ended December 31, 2018, 2017 and 2016, respectively.
We derecognized the NAPICO business in two transactions, which occurred in 2017 and 2016. We allocated an $8.1 million gain on sale and a $0.6 million net loss, respectively, to the noncontrolling interest holders in connection with the 2017 and 2016 transactions.
Net Income Attributable to Aimco Preferred Stockholders and the Aimco Operating Partnership’s Preferred Unitholders
Net income attributable to Aimco preferred stockholders and the Aimco Operating Partnership’s preferred unitholders decreased by $3.4 million and $2.9 million, respectively, during the year ended December 31, 2017 as compared to 2016. These decreases were primarily due to Aimco’s redemption of its Class Z Preferred Stock in 2016.
Noncontrolling Interests in Aimco Operating Partnership
In Aimco’s consolidated financial statements, noncontrolling interests in the Aimco Operating Partnership reflects the results of the Aimco Operating Partnership that are allocated to the OP Unit holders. Allocations to noncontrolling interests in the Aimco Operating Partnership fluctuate in proportion to variations in net income, as described above. For the year ended December 31, 2018 compared to 2017, net income allocated to noncontrolling interests in the Aimco Operating Partnership increased $20.0 million primarily due to the increase in net income, as well as an increase in the percentage allocated following the issuance of OP Units as partial consideration for the acquisition of the four Philadelphia properties, discussed further in Note 3 to the consolidated financial statements. Net income allocated to noncontrolling interests in the Aimco Operating Partnership for the year ended December 31, 2017 decreased $5.9 million as compared to 2016 due to the decrease in net income between the periods.
Critical Accounting Policies and Estimates
We prepare our consolidated financial statements in accordance with GAAP, which requires us to make estimates and assumptions. We believe that the following critical accounting policies involve our more significant judgments and estimates used in the preparation of our consolidated financial statements.
Capitalized Costs
We capitalize costs, including certain indirect costs, incurred in connection with our capital additions activities, including redevelopments and developments, other tangible apartment community improvements and replacements of existing apartment community components. Included in these capitalized costs are payroll costs associated with time spent by site employees in connection with the planning, execution and control of all capital additions activities at the apartment community level. We characterize as “indirect costs” an allocation of certain department costs, including payroll, at the area operations and corporate levels that clearly relate to capital additions activities. We also capitalize interest, property taxes and insurance during periods in which redevelopments and developments are in progress. We commence capitalization of costs, including certain indirect costs, incurred in connection with our capital addition activities, at the point in time when activities necessary to get apartment communities ready for their intended use begin. These activities include when apartment communities or apartment homes are undergoing physical construction, as well as when apartment homes are held vacant in advance of planned construction, provided that other activities such as permitting, planning and design are in progress. We cease the capitalization of costs when the apartment communities or components thereof are substantially complete and ready for their intended use, which is typically when construction has been completed and apartment homes are available for occupancy. We charge costs including ordinary repairs, maintenance and resident turnover costs to property operating expense, as incurred. Refer to the discussion of investing activities within the Liquidity and Capital Resources section for a summary of costs capitalized during the periods presented.
Impairment of Long-Lived Assets
Real estate and other long-lived assets to be held and used are stated at cost, less accumulated depreciation and amortization, unless the carrying amount of the asset is not recoverable. If events or circumstances indicate that the carrying amount of an apartment community may not be recoverable, we make an assessment of its recoverability by comparing the carrying amount to our estimate of the undiscounted future cash flows, excluding interest charges, of the apartment community. If the carrying amount exceeds the estimated aggregate undiscounted future cash flows, we recognize an impairment loss to the extent the carrying amount exceeds the estimated fair value of the apartment community.

As part of our portfolio strategy, we seek to sell up to 10% of our portfolio annually and to reinvest the proceeds from such sales in accretive uses such as capital enhancements, redevelopments, occasional developments, and selective acquisitions with projected Free Cash Flow internal rates of return higher than expected from the communities being sold. As we execute this strategy, we evaluate alternatives to sell or reduce our interest in apartment communities that do not align with our long-term investment strategy, although there is no assurance that we will sell or reduce our investment in such apartment communities during the desired time frame. For any apartment communities that are sold or meet the criteria to be classified as held for sale during the next 12 months, the reduction in the estimated holding period for these apartment communities may result in impairment losses.
Non-GAAP Measures
Various of the key financial indicators we use in managing our business and in evaluating our financial condition and operating performance are non-GAAP measures. Key non-GAAP measures we use are defined and described below, and for those non-GAAP measures used or disclosed within this annual report, reconciliations of the non-GAAP financial measures to the most comparable financial measure computed in accordance with GAAP are provided.
We measure our long-term total return using Economic Income, which is a non-GAAP financial measure and is defined and further described below under the Economic Income heading.
Funds from Operations, or FFO, Pro forma FFO and Adjusted FFO, or AFFO, are non-GAAP financial measures, which are defined and further described below under the Funds From Operations, Pro forma Funds From Operations and Adjusted Funds From Operations heading.
Net Asset Value, or NAV, Free Cash Flow, or FCF, as calculated for our retained portfolio, represents an apartment community’s property net operating income, or NOI, less spending for Capital Replacements, which represents our estimation of the capital additions made to replace capital assets consumed during our ownership period (further discussed under the Funds From Operations, Pro forma Funds From Operations and Adjusted Funds From Operations heading and the Liquidity and Capital Resources heading). FCF margin as calculated for apartment communities sold represents the sold apartment community’s NOI less $1,200 per apartment home of assumed annual capital replacement spending, as a percentage of the apartment community’s rental and other property revenues. Capital replacement spending represents a measure of capital asset usage during the period; therefore, we believe that FCF is useful to investors as a supplemental measure of apartment community performance because it takes into consideration costs incurred during the period to replace capital assets that have been consumed during our ownership.
Economic Income
Economic Income represents stockholder value creation as measured by the change in estimated NAV per share plus cash dividends per share. We believe Economic Income is important to investors as it represents a measure of the total return we have earned for our stockholders. NAV, as used in our calculation of Economic Income, is a non-GAAP measure and represents the estimated fair value of assets net of liabilities attributable to Aimco’s common stockholders and the Aimco Operating Partnership’s common unitholders on a diluted basis. We believe NAV is considered useful by some investors in real estate companies because the value of company assets can be readily estimated, even for non-earning assets such as land or properties under development. NAV has the advantage of incorporating the investment decisions of thousands of real estate investors. We believe it enhances comparability among companies that have differences in their accounting. While NAV is not identical to liquidation value in that some costs and benefits are disregarded, it is often considered a floor with upside for value ascribed to the operating platform. NAV also provides an objective basis for the perceived quality and predictability of future cash flows as well as their expected growth as these are factors considered by real estate investors.
Our estimated NAV per share and the quoted share price of Aimco Common Stock are not necessarily equal. Although we use Economic Income and NAV for comparability in assessing our value creation compared to other REITs, not all REITs publish these measures and those who do may not compute them in the same manner. Accordingly, there can be no assurance that our basis for computing these measures is comparable with that of other REITs.
We report NAV on a semiannual basis, as of the end of the first and third quarters. Economic Income for 2018 was calculated using the change in NAV per share between September 30, 2017 and 2018. NAV will fluctuate over time. This NAV information should not be relied upon as representative of the amount a stockholder could expect to receive in a liquidation event, now or in the future. Certain assets are excluded as are certain liabilities, such as taxes and transaction costs associated with a liquidation. In addition, NAV is based on management’s subjective judgments, assumptions and opinions as of the date of determination. We assume no obligation to revise or update NAV to reflect subsequent or future events or circumstances. Our NAV estimate is subject to a variety of risks and uncertainties, many of which are beyond our control, including, without limitation, those described in Item 1A. Risk Factors.

A reconciliation of NAV to Aimco’s total equity, which we believe is the most directly comparable GAAP measure, as of September 30, 2018, is provided below (in millions, except per share data):
Total equity   $2,194
Fair value adjustment for Real Estate portfolio    
 Less: consolidated real estate, at depreciated cost $(5,731)  
 Plus: fair value of real estate (1)    
 Stabilized portfolio fair value (2)$10,806
   
 Non-stabilized portfolio fair value (3)2,052
   
 Total real estate at fair value
12,858
  
 Adjustment to present real estate at fair value   7,127
Fair value adjustment for total indebtedness    
 Plus: consolidated total indebtedness, net related to Real Estate portfolio 3,647
  
 Less: fair value of indebtedness related to real estate shown above (4) (3,591)  
  Adjustment to present indebtedness at fair value   56
Adjustments to present other tangible assets, liabilities and preferred equity at fair value (5)   (155)
Estimated NAV   $9,222
 Total shares, units and dilutive share equivalents (6)   166
Estimated NAV per weighted average common share and unit - diluted   $56
(1)We compute NAV by estimating the value of our communities, using methods we believe are appropriate based on the characteristics of the communities. For purposes of estimating NAV, real estate at fair value disclosed above includes wholly owned apartment communities plus our proportionate share of communities held by non-wholly owned entities (both consolidated and unconsolidated). A reconciliation of our consolidated apartment communities to those communities included in total real estate at fair value in the table above is as follows:
Consolidated apartment communities as of September 30, 2018129
Plus: Unconsolidated apartment communities4
Apartment communities in total real estate at fair value for NAV133
For valuation purposes at September 30, 2018, we segregated these 133 communities into the following categories: stabilized portfolio and non-stabilized portfolio.
(2)As of September 30, 2018, our stabilized portfolio includes 122 communities that had reached stabilized operations and were not expected to be sold within twelve months. We value this portfolio using a direct capitalization rate method based on the annualized proportionate property NOI for the three months ended September 30, 2018, less a 2% management fee. Market property management fees range between 1.5% and 3.0% with larger, higher quality portfolios at the lower end of that range. The weighted average estimated capitalization rate as applied to the annualized property NOI was 4.96%, which we calculate on a property-by-property basis, based primarily on information published by a third-party. Community characteristics that we use to determine comparable market capitalization rates include: the market in which the community is located; infill or suburban location within the market; property quality grade; and whether the community is stabilized or value-add. We used this valuation method for approximately 84% of real estate fair value at September 30, 2018.
(3)The non-stabilized portfolio includes six apartment communities under redevelopment or development at September 30, 2018. We valued these communities by discounting projected future cash flows. Key assumptions used to estimate the value of these communities include: revenues, which are based on in-place rents, projected submarket rent growth to community stabilization based on projections published by third parties and adjusted for the impacts of redevelopment; expenses, which are based on estimated operating costs adjusted for inflation and a management fee equal to 2% of projected revenue; estimated remaining costs to complete construction; and a terminal value based on current market capitalization rates plus five basis points per year from September 30, 2018 to community stabilization. Discount rates applied to estimated future cash flows of these communities ranged between 6.30% and 6.40% depending on construction and lease-up progress as of September 30, 2018. We used this valuation method for approximately 12% of the real estate fair value at September 30, 2018. The non-stabilized portfolio also included five recently acquired apartment communities valued at purchase price and certain land investments at Aimco’s carrying value that represent approximately 4% of real estate fair value at September 30, 2018. Our calculation of NAV does not include such future values as air rights, the potential for increased density, nor the potential for completion of future phases of redevelopments.
(4)We calculate the fair value of indebtedness related to real estate as the carrying value of our non-recourse property debt adjusted for the mark-to-market asset on our fixed-rate property debt as of September 30, 2018, plus the outstanding balances on the revolving line of credit and term loan, which approximate their fair value as of September 30, 2018. The fair value of debt takes into account the duration of the existing property debt, as well as its loan to value ratio and debt service coverage. For purposes of estimating NAV, the fair value of debt includes our proportionate share of debt related to non-wholly owned entities (both consolidated and unconsolidated).

(5)Other tangible assets consist of cash, restricted cash, accounts receivable and other assets for which we reasonably expect to receive cash through the normal course of operations or another future event. Other tangible liabilities consist of accounts payable, accrued liabilities and other tangible liabilities we reasonably expect to settle in cash through the normal course of operations or another future event. Other tangible assets and liabilities were generally valued at their carrying amounts and reduced by the noncontrolling interests’ portion of these amounts and exclude intangible assets and liabilities reflected on our consolidated balance sheet. The fair value of our preferred stock is estimated as the closing share price on September 30, 2018, less accrued dividends. Such accrued dividends are assumed to be accounted for in the closing share price and these amounts are also included in other tangible liabilities. For purposes of this NAV calculation, no realizable value has been assigned to goodwill or other intangible assets. Deferred income, which includes below market lease liabilities, recognized in accordance with GAAP in connection with the purchase of the related apartment communities, and cash received in prior periods and required to be deferred under GAAP, is excluded from this NAV calculation.
(6)Total shares, units and dilutive share equivalents represents Common Stock, OP Units, participating unvested restricted shares and the dilutive effect of common stock equivalents outstanding as of September 30, 2018.
Funds From Operations, Pro forma Funds From Operations and Adjusted Funds From Operations
FFO is a non-GAAP financial measure that we believe, when considered with the financial statements determined in accordance with GAAP, is helpful to investors in understanding our performance because it captures features particular to real estate performance by recognizing that real estate generally appreciates over time or maintains residual value to a much greater extent than do other depreciable assets such as machinery, computers or other personal property. The National Association of Real Estate Investment Trusts, or Nareit, defines FFO as net income computed in accordance with GAAP, excluding: depreciation and amortization related to real estate; gains and losses from sales and impairment of depreciable assets and land used in our primary business; and income taxes, current or deferred, directly associated with a gain or loss on sale of real estate, and including our share of the FFO of unconsolidated partnerships and joint ventures. Adjustments for unconsolidated partnerships and joint ventures are calculated on the same basis to determine FFO. We calculate FFO attributable to Aimco common stockholders (diluted) by subtracting dividends on preferred stock and amounts allocated from FFO to participating securities.
In addition to FFO, we compute Pro forma FFO and AFFO, which are also non-GAAP financial measures that we believe are helpful to investors in understanding our performance. Pro forma FFO represents FFO attributable to Aimco common stockholders (diluted), excluding preferred equity redemption-related amounts and certain other income or costs, adjusted for noncontrolling interests. Preferred equity redemption-related amounts (gains or losses) are items that periodically affect our operating results and we exclude these items from our calculation of Pro forma FFO because such amounts are not representative of our operating performance.
In computing 2018 Pro forma FFO, we made a number of adjustments. We were engaged in litigation with Airbnb, which was resolved during the year. Due to the unpredictable nature of these proceedings, related amounts recognized, net of income tax effect, have been excluded from Pro forma FFO. In connection with the sale of our Asset Management business, we incurred severance costs during 2018. We exclude such costs from Pro forma FFO because we believe these costs incurred are closely related to the sale of the business. We also excluded from Pro forma FFO the tax benefit due to the release of a valuation allowance. Due to the sale of the Asset Management business, we expect to realize our deferred tax benefits. As a result, we determined the valuation allowance recorded in connection with recognizing the effect of the 2017 tax reform is no longer necessary. We excluded the effect of the establishment of the valuation allowance from Pro forma FFO and as such have excluded the benefit from its release. We have also excluded the impact of tax reform. Finally, we addressed approximately half of our property loans maturing in 2019, 2020 and 2021. In connection with this activity, we incurred debt extinguishment costs, which we have excluded from Pro forma FFO.
AFFO represents Pro forma FFO reduced by Capital Replacements, which represents our estimation of the actual capital additions made to replace capital assets consumed during our ownership period. When we make capital additions at an apartment community, we evaluate whether the additions extend the useful life of an asset as compared to its condition at the time we purchased the apartment community. We classify as Capital Improvements those capital additions that meet these criteria, and we classify as Capital Replacements those that do not. AFFO is a key financial indicator we use to evaluate our operational performance and is one of the factors that we use to determine the amounts of our dividend payments.
FFO, Pro forma FFO and AFFO should not be considered alternatives to net income, as determined in accordance with GAAP, as indications of our performance. Although we use these non-GAAP measures for comparability in assessing our performance compared to other REITs, not all REITs compute these same measures and those who do may not compute them in the same manner. Additionally, computation of AFFO is subject to our definition of Capital Replacement spending. Accordingly, there can be no assurance that our basis for computing these non-GAAP measures is comparable with that of other REITs.

For the years ended December 31, 2018, 2017 and 2016, Aimco’s FFO, Pro forma FFO and AFFO are calculated as follows (in thousands):
 2018 2017 2016
Net income attributable to Aimco common stockholders (1)$656,597
 $306,861
 $417,781
Adjustments:     
Real estate depreciation and amortization, net of noncontrolling partners’ interest368,961
 352,109
 314,840
Gain on dispositions and other, net of noncontrolling partners’ interest(669,450) (262,583) (381,131)
Income tax adjustments related to gain on dispositions and other items (2)27,310
 (8,265) 6,374
Common noncontrolling interests in Aimco Operating Partnership’s share of above adjustments14,063
 (3,810) 2,782
Amounts allocable to participating securities402
 (81) 88
FFO attributable to Aimco common stockholders – diluted$397,883
 $384,231
 $360,734
Adjustments, all net of common noncontrolling interests in Aimco OP and participating securities:     
Preferred equity redemption related amounts
 
 1,877
Tax provision (benefit) related to tax reform legislation (3)273
 (498) 
Tax benefit due to release of valuation allowance (4)(19,349) 
 
Litigation, net (5)(8,558) 
 
Severance costs (6)1,282
 
 
Prepayment penalties, net (7)14,089
 
 
Pro forma FFO attributable to Aimco common stockholders – diluted$385,620
 $383,733
 $362,611
Capital Replacements, net of common noncontrolling interests in Aimco Operating Partnership and participating securities(48,493) (51,760) (55,289)
AFFO attributable to Aimco common stockholders – diluted$337,127
 $331,973
 $307,322
Weighted average common shares outstanding – diluted (FFO, Pro forma FFO and
AFFO) (8)
156,053
 156,796
 156,391
      
Net income attributable to Aimco per common share – diluted$4.21
 $1.96
 $2.67
FFO per share – diluted$2.55
 $2.45
 $2.31
Pro Forma FFO per share – diluted$2.47
 $2.45
 $2.32
AFFO per share – diluted$2.16
 $2.12
 $1.97
(1)
Represents the numerator for calculating Aimco’s earnings per common share in accordance with GAAP (see Note 10 to the consolidated financial statements in Item 8).
(2)For the year ended December 31, 2018, income taxes related to gain on dispositions and other items includes tax on the gain on the sale of the Asset Management business, as well as tax on the gain on the sale of apartment communities during the year ended December 31, 2018.
(3)In connection with the Tax Cuts and Jobs Act signed into law in December 2017, we recognized income tax benefit during 2017 and adjusted the estimated impact of tax reform upon the conclusion of our analysis of the effects during 2018. We have excluded such amounts from Pro forma FFO.
(4)Due to the sale of the Asset Management business, we expect to realize our deferred tax benefits. As a result, we have determined that a valuation allowance is no longer necessary. We excluded the effect of the establishment of the valuation allowance from Pro forma FFO and as such have excluded the benefit from its release.
(5)During 2018, we were engaged in litigation with Airbnb, which was resolved during the year. Due to the unpredictable nature of these proceedings, related amounts recognized, net of income tax effect, have been excluded from Pro forma FFO.
(6)We incurred severance costs in connection with the sale of our Asset Management business. We exclude such costs from Pro forma FFO because we believe these costs are closely related to the sale of the business.
(7)In connection with 2018 refinancing activity undertaken related to property-level debt scheduled to mature in 2019, 2020 and 2021, we incurred debt extinguishment costs, net of income tax effect, which have been excluded from Pro forma FFO.
(8)Represents the denominator for Aimco’s earnings per common share – diluted, calculated in accordance with GAAP.
Refer to the Executive Overview for discussion of our Pro forma FFO and AFFO results for 2018, as compared to their comparable periods in 2017.

Refer to the Liquidity and Capital Resources section for further information regarding our capital investing activities, including Capital Replacements.
The Aimco Operating Partnership does not separately compute or report FFO, Pro forma FFO or AFFO. However, based on Aimco’s method for allocation of such amounts to noncontrolling interests in the Aimco Operating Partnership, as well as limited differences between the amounts of net income attributable to Aimco’s common stockholders and the Aimco Operating Partnership’s unit holders during the periods presented, FFO, Pro forma FFO and AFFO amounts on a per unit basis for the Aimco Operating Partnership would be expected to be substantially the same as the corresponding per share amounts for Aimco.
Leverage Ratios
As discussed under the Balance Sheet and Liquidity heading, as part of our leverage strategy, we target the ratio of Proportionate Debt and Preferred Equity to Adjusted EBITDA to be below 7.0x and we target the ratio of Adjusted EBITDA to Adjusted Interest Expense and Preferred Dividends to be greater than 2.5x. We believe these ratios are important measures as they are commonly used by investors and analysts to assess the relative financial risk associated with balance sheets of companies within the same industry, and they are believed to be similar to measures used by rating agencies to assess entity credit quality.
We calculate Adjusted EBITDA and Adjusted Interest Expense used in our leverage ratios based on the most recent three month amounts, annualized.
Proportionate Debt, as used in our leverage ratios, is a non-GAAP measure and representsincludes our share of the long-term, non-recourse property debt obligations recognizedsecured by apartment communities in the Real Estate portfolio and outstanding borrowings under our consolidated financial statements, as well as our share of the debt obligations of our unconsolidated partnerships,

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revolving credit facility, reduced by our share of the cash and restricted cash of our consolidated and unconsolidated partnerships owning communities in our Real Estate portfolio, and also by our investment in the subordinate tranches of a securitization trust that holds certain of our property debt, (essentially, ourwhich is essentially an investment in our own non-recourse property loans). loans.
In our Proportionate Debt computation, we increase our recorded debt by unamortized debt issue costs because these amounts represent cash expended in earlier periods and do not reduce our contractual obligations, and we reduce our recorded debt obligations by the amounts of cash and restricted cash on-hand (such restricted cash amounts beingwhich are primarily restricted under the terms of our property debt agreements),agreements, assuming these amounts would be used to reduce our outstanding leverage. We further reduce our recorded debt obligations by the value of our investment in a securitization trust that holds certain of our property debt, as our payments of principal and interest associated with such property debt will ultimately repay our investments in the trust.
We believe Proportionate Debt is useful to investors as it is a measure of our net exposure to debt obligations. Proportionate Debt, as used in our leverage ratios, is calculated as set forth in the table below.
Preferred Equity, as used in our leverage ratios, represents the redemption amounts for Aimco’s preferred stock and the Aimco Operating Partnership’s preferred OP Units. Preferred Equity, although perpetual in nature, is another component of our overall leverage.
Adjusted EBITDA is a non-GAAP performance measure. We believe Adjusted EBITDA provides investors relevant and useful information because it allows investors to view income from our operations on an unleveraged basis, before the effects of taxes, depreciation and amortization, gains or losses on sales of and impairment losses related to real estate, and various other items described below. The items excluded from Adjusted EBITDA are generally non-cash items included in net income computed in accordance with GAAP that do not affect our ability to service our debt obligations or preferred equity requirements.
Adjusted EBITDA represents Aimco’s share of the consolidated amount of our net income, adjusted to exclude the effect of the following items for the reasons set forth below:
interest,Adjusted Interest Expense, defined below, to allow investors to compare a measure of our earnings before the effects of our indebtedness with that of other companies in the real estate industry;
preferred dividends, to allow investors to compare a measure of our performance before the effects of our capital structure and indebtedness with that of other companies in the real estate industry;
income taxes, to allow investors to measure our performance independent of income taxes, which may vary significantly from other companies within our industry due to leverage and tax planning strategies, among other drivers;factors;
depreciation and amortization, gains or losses on dispositions and impairment losses related to real estate, for similar reasons to those set forth in our discussion of FFO, Pro forma FFO and AFFO in the preceding section; and
provisions for (or recoveries of) losses on notes receivable,other items, including gains on dispositions of non-depreciable assets, and non-cash stock-based compensation, as these are items that periodically affect our operations but that are not necessarily representative of our ability to service our debt obligations;obligations.
the interest income we earn on our investment in the subordinate tranches of a securitization that holds certain of our property debt, as this income is being generated indirectly from our payments of principal and interest associated with the property debt held by the trust and such amounts will ultimately repay our investment in the trust; and
EBITDA amounts related to our legacy asset management business, including the debt obligations and associated interest expense for the legacy asset management business, as we are not responsible for the operation of this portfolio and associated interest payments are not funded from our operations.
While Adjusted EBITDA is a relevant measure of performance and is commonly used in leverage ratios, it does not represent net income as defined by GAAP, and should not be considered as an alternative to net income in evaluating our performance. Further, our definition and computation of Adjusted EBITDA may not be comparable to similar measures reported by other companies.

Adjusted Interest Expense, as calculated in our leverage ratios, is a non-GAAP measure that we believe is meaningful for investors and analysts as it presents our share of current recurring interest requirements associated with leverage. Our calculation of Adjusted Interest is set forthExpense represents our proportionate share of interest expense on non-recourse property debt encumbering apartment communities in the table below.Real Estate portfolio and interest expense on our term loan and revolving credit facility borrowings. We exclude from our calculation of Adjusted Interest:Interest Expense:
debt prepayment penalties, which are items that, from time to time, affect our operating results, but are not representative of our scheduled interest obligations;
the amortization of deferred financingdebt issue costs, as these amounts have already been expended in previous periods and are not representative of our current or prospective debt service requirements; and
the income we receive on our investment in the securitization trust that holds certain of our property debt, as this income is being generated indirectly from interest we pay with respect to property debt held by the trust.
Preferred Dividends represents the preferred dividends paid on Aimco’s preferred stock and the preferred distributions paid on the Aimco Operating Partnership’s preferred OP Units, exclusive of preferred equity redemption related amounts. We add Preferred

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Dividends to Adjusted Interest Expense for a more complete picture of the interest and dividend requirements of our leverage, inclusive of perpetual preferred equity.
For the years ended December 31, 2015 and 2014, reconciliations
Reconciliations of the most closely related GAAP measures to our calculations of Proportionate Debt, Preferred Equity, Adjusted EBITDA, Adjusted Interest Expense and Preferred Dividends, as used in our leverage ratios, are as follows (in thousands):
December 31, December 31, 2018
2015 2014 
Total indebtedness$3,873,160
 $4,135,139
 
Total indebtedness associated with Real Estate portfolio$4,075,665
Adjustments:     
Debt issue costs related to non-recourse property debt21,695
Debt related to assets classified as held for sale22,693
Proportionate share adjustments related to debt obligations of consolidated and unconsolidated partnerships(139,295) (117,827) (9,533)
Cash and restricted cash(137,745) (120,416) (72,595)
Proportionate share adjustments related to cash and restricted cash held by consolidated and unconsolidated partnerships2,893
 2,103
 912
Securitization investment and other(65,449) (66,074) 
Securitization trust investment and other(88,457)
Proportionate Debt$3,533,564
 $3,832,925
 $3,950,380
     
Preferred stock$159,126
 $186,126
 $125,000
Preferred OP Units87,926
 87,937
 101,291
Preferred Equity247,052
 274,063
 226,291
Proportionate Debt plus Preferred Equity$3,780,616
 $4,106,988
 
Proportionate Debt and Preferred Equity$4,176,671
Year Ended December 31, Three Months Ended
2015 2014 December 31, 2018
Net income attributable to Aimco Common Stockholders$235,966
 $300,220
 $5,226
Adjustments:     
Interest expense, net of noncontrolling interest195,934
 216,882
 
Adjusted Interest Expense38,424
Income tax benefit(29,549) (20,026) (409)
Depreciation and amortization, net of noncontrolling interest298,880
 275,175
 91,249
Gains on disposition and other, net of income taxes and noncontrolling partners' interests(173,694) (265,358) 
Interest income received on securitization investment(6,092) (5,697) 
Other items, net32,631
 36,075
 
Gain on dispositions and other, inclusive of related income taxes and net of noncontrolling partners’ interests2,311
Preferred stock dividends2,148
Net income attributable to noncontrolling interests in Aimco Operating Partnership2,291
Pro forma adjustment (1)3,342
Adjusted EBITDA$554,076
 $537,271
 $144,582
 
Annualized Adjusted EBITDA$578,328

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(1)Our Adjusted EBITDA has been calculated on a pro forma basis to adjust for significant items impacting the three months ended December 31, 2018 for which annualization would distort the results.
Year Ended December 31, Three Months Ended
2015 2014 December 31, 2018
Interest expense$199,685
 $220,971
 $57,441
Adjustments:     
Proportionate share adjustments related to interest of consolidated and unconsolidated partnerships(5,262) (6,064) (84)
Debt prepayment penalties and other non-interest items(6,068) (9,231) (15,531)
Amortization of deferred loan costs(4,227) (3,674) 
Interest income received on securitization investment(6,092) (5,697) 
Adjusted Interest$178,036
 $196,305
 
Amortization of debt issue costs(1,441)
Interest income earned on securitization trust investment(1,961)
Adjusted Interest Expense$38,424
     
Preferred stock dividends$11,794
 $7,947
 2,148
Preferred stock redemption related amounts(695) 
 
Preferred OP Unit distributions6,943
 6,497
 1,934
Preferred Dividends18,042
 14,444
 4,082
Adjusted Interest and Preferred Dividends$196,078
 $210,749
 
Adjusted Interest Expense and Preferred Dividends$42,506
 
Annualized Adjusted Interest Expense$153,696
Annualized Adjusted Interest Expense and Preferred Dividends$170,024

Liquidity and Capital Resources
Liquidity
Liquidity is the ability to meet present and future financial obligations. Our primary source of liquidity is cash flow from our operations. Additional sources are proceeds from sales of apartment communities, proceeds from refinancings of existing property debt, borrowings under new property debt, borrowings under our Credit Agreementrevolving credit facility and proceeds from equity offerings.
Our principal uses for liquidity include normal operating activities, payments of principal and interest on outstanding property debt, capital expenditures, dividends paid to stockholders, distributions paid to noncontrolling interest partners and acquisitions of and investments in, apartment communities, including redevelopment, development and other capital spending.communities. We use our cash and cash equivalents and our cash provided by operating activities to meet short-term liquidity needs. In the event that our cash and cash equivalents and cash provided by operating activities are not sufficient to cover our short-term liquidity needs, we have additional means, such as short-term borrowing availability and proceeds from apartment community sales and refinancings. We may use our Credit Agreementrevolving credit facility for working capital and other short-term purposes, such as funding investments on an interim basis. We expect to meet our long-term liquidity requirements, such as debt maturities, redevelopment spending and apartment community acquisitions, through primarily non-recourse, long-term borrowings, primarily non-recourse, the issuance of equity securities (including OP Units), the sale of apartment communities and cash generated from operations.
As of December 31, 2018, our primary sources of liquidity were as follows:
$36.9 million in cash and cash equivalents;
$35.7 million of restricted cash, which consists primarily of escrows related to resident security deposits and reserves and escrows held by lenders for capital additions, property taxes and insurance; and
$632.5 million of available capacity to borrow under our revolving credit facility after consideration of $7.1 million of letters of credit backed by the facility.
At December 31, 2018, we also held unencumbered apartment communities with an estimated fair market value of approximately $2.7 billion, up 50.0% from December 31, 2017.
Leverage and Capital Resources
The availability of credit and its related effect on the overall economy may affect our liquidity and future financing activities, both through changes in interest rates and access to financing. Currently, interest rates are low compared to historical levels and many lenders are active in the market. However, any adverse changes in the lending environment could negatively affect our liquidity. We believe we have mitigated much of this exposure by reducing our short and intermediate term maturity risk through refinancing such loans with long-dated, fixed-rate property debt. However, if property financing options become unavailable for our further debt needs, we may consider alternative sources of liquidity, such as reductions in capital spending or proceeds from assetapartment community dispositions.
AtTwo credit rating agencies rate our creditworthiness and both have rated our credit and outlook as BBB- (stable), an investment grade rating. Our investment grade rating would be useful in accessing capital through the sale of bonds in private or public transactions. However, our intention and historical practice has been to raise debt capital in the form of property-level, non-recourse, long-dated, fixed-rate, amortizing debt, the cost of which is generally less than that of recourse debt and the terms of which also provide for greater balance sheet safety.
As of December 31, 2015,2018, approximately 93%91.0% of our leverage consisted of property-level, non-recourse, long-dated, debt, 1% consisted of borrowings under our revolving credit agreement and 6% consisted of perpetual preferred equity, a combination which reduces our refunding and re-pricing risk. The weighted average maturity of our property-level debt was 8.1 years, with 6.7% of our unpaid principal balances maturing during 2016 and, on average, 9.0% of our unpaid principal balances maturing each year from 2017 through 2019.amortizing debt. Approximately 98%93.4% of our property-level debt is fixed-rate, which provides a hedge against increases in interest rates, capitalization rates and inflation. The weighted average maturity of our property-level debt was 8.0 years.
AlthoughOf our property-level debt, $167.5 million of our unpaid principal balances mature during 2019. On average, 7.6% of our unpaid principal balances will mature each year from 2020 through 2022.
While our primary sourcessource of leverage areis property-level, non-recourse, long-dated, fixed-rate, amortizing debt, and perpetual preferred equity, we also have a Senior Secured Credit Agreementcredit facility with a syndicate of financial institutions, which we refer to as our Credit Agreement. The Credit Agreement provides for $600.0 million of revolving loan commitments, which we use for working capital and other short-term purposes. Borrowings underinstitutions. During the Credit Agreement bear interest at a rate set forth on a pricing grid, which rate varies based on our leverage (initially either at LIBOR, plus 1.35%, or, at our option, Prime plus 0.35%). Atyear ended December 31, 2015,2018, we exercised our $200.0 million expansion option on the credit facility, increasing the total capacity to $800.0 million. As of December 31, 2018, we had $27.0$160.4 million of outstanding borrowings under our revolving credit facility, which represented 3.7% of our total leverage.
As of December 31, 2018, our outstanding perpetual preferred equity represented approximately 5.2% of our total leverage. Our preferred securities are perpetual in nature; however, for illustrative purposes, we compute the Credit Agreement, and we had the capacity to

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borrow $536.6 million, net of the outstanding borrowings and $36.4 million for undrawn letters of credit backed by the Credit Agreement. The interest rateour total leverage assuming a 40-year maturity on our outstandingpreferred securities.

The combination of non-recourse property level debt, borrowings under our revolving credit facility and perpetual preferred equity that comprises our total leverage, reduces our refunding and re-pricing risk. The weighted average maturity for our total leverage described above was 1.59% at9.5 years as of December 31, 2015.2018.
Under the Credit Agreement,revolving credit facility, we have agreed to maintain Debt Service anda Fixed Charge Coverage ratiosratio of 1.50x and 1.40x, respectively, as well as other covenants customary for similar revolving credit arrangements. For the year ended December 31, 2015,2018, our Debt Service and Fixed Charge Coverage ratios were 2.01x and 1.89x, respectively,ratio was 2.05x, compared to ratiosratio of 1.82x and 1.73x, respectively,2.01x for the year ended December 31, 2014.2017. We expect to remain in compliance with these covenantsthis covenant during the next 12 months.
At December 31, 2015, we had $50.8 millionChanges in cashCash, Cash Equivalents and cash equivalents and $87.0 million of restricted cash, an increase of $21.8 million and a decrease of $4.5 million, respectively, from December 31, 2014. Restricted cash primarily consists of reserves and escrows held by lenders for bond sinking funds, capital additions, property taxes and insurance, and escrows related to resident security deposits.Cash
The following discussion relates to changes in consolidated cash, cash equivalents and restricted cash due to operating, investing and financing activities, which are presented in our consolidated statements of cash flows in Item 8.8 of this report.
Operating Activities
For the year ended December 31, 2015,2018, our net cash provided by operating activities of $359.9 million was primarily related to$396.4 million. Our operating income from our consolidated apartment communities, whichcash flow is affected primarily by rental rates, occupancy levels and operating expenses related to our portfolio of apartment communities, in excess of payments of operating accounts payable and accrued liabilities.communities. Cash provided by operating activities for the year ended December 31, 2015,2018, increased by $38.5$4.3 million as compared to the year ended December 31, 2014, primarily due to an increase in the net operating income of apartment communities in our retained portfolio, primarily2017, due to improved operating results as well asof our Same Store communities, contribution from acquired communities and increased contribution from redevelopment apartmentand lease-up communities, and a decrease in cash paid for interest, partially offset by a decrease in the net operating income ofassociated with apartment communities we sold during 20152018 and 2014.our sale of the Asset Management business.
Investing Activities
For the year ended December 31, 2015, our2018, net cash used inprovided by investing activities of $170.9$121.8 million consisted primarily of capital expenditures$708.8 million in proceeds from the disposition of the Asset Management business, four apartment communities located in the Hunters Point area of San Francisco, and purchases of real estate,four other apartment communities, partially offset by proceeds from dispositionsthe acquisitions of real estate. Bent Tree Apartments, Avery Row, four apartment communities in Philadelphia, and capital expenditures.
Capital expendituresadditions for our Real Estate segment totaled $367.2$338.8 million, $367.3$321.9 million and $350.3$312.8 million during the years ended December 31, 2015, 20142018, 2017 and 2013,2016, respectively. We generally fund capital additions with cash provided by operating activities and cash proceeds from sales of apartment community sales.communities.
We categorize our capital spending for communities in our Real Estate portfolio broadly into six primary categories:
capital replacements, which represents our estimation of therepresent capital additions made to replace capital assetsthe portion of acquired apartment communities consumed during our period of ownership;
capital improvements, which are non-redevelopmentrepresent capital additions that are made to enhancereplace the value, profitability or useful lifeportion of an asset from its original purchase condition;acquired apartment communities consumed prior to our period of ownership;
property upgrades,capital enhancements, which may include kitchen and bath remodeling, energy conservation projects and investments in longer-lived materials designed to reduce turnover and maintenance costs, all of which are generally lesser in scope than redevelopment additions and do not significantly disrupt property operations;
redevelopment additions, which represent capital additions intended to enhance the value of the apartment community through the ability to generate higher average rental rates, and may include costs related to entitlement, which enhance the value of a community through increased density, and costs related to renovation of exteriors, common areas or apartment homes;
development additions, which represent construction and related capitalized costs associated with our ground-up development projects;of apartment communities; and
casualty replacements spending,capital additions, which represent construction and related capitalized costs incurred in connection with the restoration of an assetapartment community after a casualty event such as a severe snow storm, hurricane, tornado, flood or flood.fire.
We exclude from these measures the amounts of capital spending related to apartment communities sold or classified as held for sale at the end of the period. Note that we deduct capital replacementsperiod from Pro-forma FFO to calculate AFFO, which we use to help determine the amounts of our dividend payments.foregoing measures.

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A summary of the capital spending for these categories, along with a reconciliation of the total for these categories to the capital expenditures reported in the accompanying consolidated statements of cash flowflows for the years ended December 31, 2015, 20142018, 2017 and 2013,2016, are presented below (dollars in thousands):
2015 2014 20132018 2017 2016
Real Estate     
Capital replacements$49,432
 $48,791
 $62,536
$37,472
 $34,892
 $38,088
Capital improvements21,988
 25,029
 55,259
16,055
 16,729
 14,922
Property upgrades49,433
 49,287
 32,709
Capital enhancements102,910
 91,360
 68,340
Redevelopment additions117,820
 181,951
 178,287
114,756
 156,140
 155,398
Development additions115,638
 46,928
 15,898
61,185
 14,249
 31,823
Casualty replacements7,004
 5,800
 6,650
Total capital additions361,315
 357,786
 351,339
Plus: additions related to apartment communities sold or held for sale1,633
 9,668
 24,699
Casualty capital additions6,425
 8,556
 4,201
Real Estate capital additions338,803
 321,926
 312,772
Plus: additions related to consolidated Asset Management communities and apartment communities sold or held for sale9,914
 32,303
 25,742
Consolidated capital additions362,948
 367,454
 376,038
348,717
 354,229
 338,514
Plus: net change in accrued capital spending4,232
 (130) (25,700)(8,228) 3,875
 8,131
Capital expenditures per consolidated statement of cash flows$367,180
 $367,324
 $350,338
$340,489
 $358,104
 $346,645
For the years ended December 31, 2015, 20142018, 2017 and 2013,2016, we capitalized $11.7$7.6 million, $14.2$7.6 million and $17.6$9.6 million of interest costs, respectively, and $28.2$36.8 million, $29.2$36.0 million and $33.2$32.9 million of other direct and indirect costs, respectively.
Redevelopment and Redevelopment/Development
Information regarding ourWe execute redevelopments using a range of approaches. We prefer to limit risk by executing redevelopments using a phased approach, in which we renovate an apartment community in stages. Smaller phases provide us the flexibility to maintain current earnings while aligning the timing of the completed apartment homes with market demand. The following table summarizes ongoing redevelopment and development projectsredevelopments of this nature at December 31, 2015, are presented below2018 (dollars in millions):
    Schedule
 
Total Number
of Apartment Homes at Completion
Estimated Net 
Investment at Completion
Inception-to-Date Net
Investment
Construction
Start
Initial
Occupancy
Stabilized OccupancyStabilized NOI
Redevelopment       
Park Towne Place948
$97.0
$62.7
Multiple3Q 20151Q 20172Q 2018
The Sterling535
62.5
47.1
MultipleMultiple3Q 20164Q 2017
Subtotal1,483
$159.5
$109.8
    
        
Development       
One Canal310
$195.0
$162.7
4Q 20132Q 20163Q 20174Q 2018
Total1,793
$354.5
$272.5
    
        
Redevelopment
Construction Completed
       
Lincoln Place795
$360.0
$359.0
MultipleMultiple2Q 20153Q 2016
The Preserve at Marin126
124.0
123.4
4Q 20121Q 20143Q 20154Q 2016
2900 on First Apartments135
15.2
14.7
1Q 20141Q 20142Q 20153Q 2016
Ocean House on Prospect53
14.8
14.6
4Q 20143Q 20154Q 20151Q 2017
Subtotal1,109
$514.0
$511.7
    
        
Development
Construction Completed
       
Vivo91
$45.0
$43.8
n/a4Q 20153Q 20164Q 2017
Total Completed 20151,200
$559.0
$555.5
    
 Location Apartment Homes Approved for Redevelopment Estimated/Potential Net Investment Inception-to-Date Net Investment
Bay ParcMiami, FL 60
 $24.1
 $20.6
Calhoun Beach ClubMinneapolis, MN 275
 28.7
 10.5
Flamingo South BeachMiami Beach, FL 
 39.7
 14.2
Palazzo West at The GroveLos Angeles, CA 389
 24.5
 19.1
YorktownLombard, IL 292
 25.7
 20.0
OtherVarious 92
 12.9
 12.9
Total  1,108
 $155.6
 $97.3

We also undertake ground-up development when warranted by risk-adjusted investment returns, either directly or in connection with the redevelopment of an existing apartment community. When smaller redevelopment phases are not possible, we may engage in redevelopment activities where an entire building or community is vacated. The following table summarizes our investments related to these developments and redevelopments at December 31, 2018 (dollars in millions):
 Location Apartment Homes Approved for Redevelopment or Development Estimated/Potential Net Investment Inception-to-Date Net Investment Stabilized Occupancy NOI Stabilization
The Fremont (formerly Anschutz Expansion)Denver, CO (MSA) 253
 $87.0
 $10.6
 3Q 2021 4Q 2022
Elm Creek TownhomesElmhurst, IL 58
 35.1
 11.3
 2Q 2021 3Q 2022
Parc MosaicBoulder, CO 226
 117.0
 68.9
 4Q 2020 1Q 2022
Park Towne PlacePhiladelphia, PA 940
 176.5
 172.9
 1Q 2019 2Q 2020
Total  1,477
 $415.6
 $263.7
    
Net investment represents the total actual or estimated investment, net of tax and other credits earned as a direct result of our redevelopment or development of the community. For phased redevelopments, potential net investment relates to the current phase of the redevelopment.
Stabilized Occupancy represents the period in which we expect the apartment communities being developed or redeveloped to achieve targeted physicalstabilized occupancy, generally greater than 90%. Stabilized
NOI Stabilization represents the period in which we expect the communities to achieve stabilized rents and operating costs, generally five quarters after Stabilized Occupancy.

39


During the year ended December 31, 2015, we invested $117.8 million in our redevelopment projects, and we completed construction at four redevelopment projects. Lincoln Place, in Venice, California, and The Preserve at Marin, in Corte Madera, California, were completed in the first quarter and, as of December 31, 2015, were 96% and 94% occupied, respectively.2900 on First in Seattle, Washington, was completed during the second quarter and, as of December 31, 2015, was 90% occupied. Ocean House on Prospect, in La Jolla, California, was completed in the fourth quarter and, as of December 31, 2015, was 94% occupied.occupancy stabilization.
Redevelopment of Park Towne Place includes significant renovation of existing commercial space, upgrading common areas and amenities, and the phased redevelopment of apartment homes. The first phase included redevelopment of the commercial space, common areas and amenities, and the apartment homes in the South Tower, one of the four residential towers that comprise the community. TheOur total estimated or potential net investment forin redevelopment and development is $571.2 million with a projected weighted average net operating income yield on these investments of 6.1%, assuming untrended rents. Of this first phase of redevelopment of $60total, $361.0 million reflects a gross investment of $71 million, reduced by $11 million of historic tax credits. At the end of the year, 85% of the 229 apartment homes in the South Tower hadhas been redeveloped and rent achievementfunded. We expect to date is in excess of Aimco’s underwriting. Redevelopment offund the remaining apartment homes in the South Tower, along with the common areasredevelopment and amenities have since been substantially completed. Redevelopmentdevelopment investment through a combination of the 245 apartment home East Tower, approved in the third quarter 2015, is underway. This phase represents a net investment of $37 million, reflecting an estimated gross investment of $45.5 million reduced by approximately $8.5 million of historic tax credits. In total, 474 apartment homes at Park Towne Place have been approved for redevelopment. As of the end of January 2016, we had leased 83% of the apartment homes in the South Towerleverage and signed leases for 55% of the 12,560 square feet of commercial space in theproceeds from community at rents above underwriting.
Redevelopment of The Sterling includes significant renovation of existing retail space, upgrading common areas, and the phased redevelopment of apartment homes. Renovation of the common areas and retail space was completed in second quarter 2015, at a cost consistent with underwriting. Based on the success of the lease-up pace and pricing of the apartment homes that have been completed, Aimco approved the redevelopment of an additional five floors, containing 130 apartment homes. The estimated net investment for the additional apartment homes is $13 million. At the end of fourth quarter, 58% of the 409 apartment homes approved for redevelopment were complete, at a cost consistent with underwriting and as of the end of January 2016, we had leased 97% of the completed apartment homes, with rents above underwriting and had signed leases for 84% of the 19,845 square feet of retail space at rents above underwriting.sales.
During the year ended December 31, 2015,2018, we invested $115.6$175.9 million in ourredevelopment and development projects. This included an investment of $99.7activities.
In Boulder, Colorado, we have invested $68.9 million in the development of One CanalParc Mosaic, a 226-unit apartment home community. The site is two miles from the new Google campus and is across the street from Ball Aerospace’s Technology Campus and Foothills Hospital. Building in Boulder is highly regulated and new supply is limited, notwithstanding higher enrollment at the historic Bulfinch Triangle neighborhoodUniversity of Boston’s West End. One Canal will include 310Colorado and increased employment generally.
At the University of Colorado Anschutz Medical Campus, we exercised our option to acquire approximately two acres of land adjacent to our 21 Fitzsimons apartment community, and broke ground on the development of The Fremont, a 253-apartment home community. We expect to invest approximately $87.0 million to construct the community, which is expected to be ready for occupancy in late 2020.
We also commenced the next phase of redevelopment at our Flamingo community, located in Miami Beach, bringing our potential net new investment to $39.7 million. This phase includes extensive redevelopment of retail, leasing, and common areas, including major enhancements to the entryway.
In Center City, Philadelphia, we completed the redevelopment of Park Towne Place, and as of December 31, 2018, we had leased 95.6% of the apartment homes and 22,000 square feetat the community. This multi-year redevelopment of commercial space. During the three months ended December 31, 2015, we approved a $5.0 million increase in scope, comprised of additional tenant improvements, enhanced penthouse units, improved kitchen layouts940 apartment homes, amenities, and common area enhancements. The additional tenant improvements are basedspaces, was executed on plan and leased-up in-line with expectations with expected free cash flow returns of 9.2%.
In San Jose, we completed the executionredevelopment of Saybrook Pointe, a 15-year lease for all324-apartment home, garden-style community. Construction was completed on-time and in-line with underwritten costs, and lease-up of the commercial space. This lease commences in Spring 2016, approximately threecommunity finished ahead of schedule and at rates above underwriting, increasing the expected free cash flow return to 14.3%, a half years earlier than contemplated in the project100 basis point outperformance to underwriting. We anticipate the completion of construction in April, with the commencement of leasing shortly thereafter. Our investment in One Canal has been and will be funded in part by a $114.0 million non-recourse property loan, of which $27.8 million was available to draw at December 31, 2015.
Our development spending duringDuring the year ended December 31, 2015, also included $15.9 million2018, we leased 457 apartment homes at Vivo, the eight-story, 91-apartment home near Kendall Square in Cambridge, Massachusetts, under constructionour redevelopment and development communities. At December 31, 2018, our exposure to lease-up at the time we acquired it during the second quarter of 2015. Vivo is located two blocks from Axiom Apartment Homes, which we also acquired during the second quarter of 2015,active redevelopment and is contiguous to a large life science complex now under construction, the completiondevelopment communities was approximately 366 apartment homes, of which is planned for late spring or early summer 2016. At closing,208 were being constructed at Parc Mosaic, and 158 were located in four other communities. Additionally, we paid $27.9 million and agreedexpect to fundacquire One Ardmore in 2019 upon its completion, as part of the remaining construction costs. We expect a total investment of $45.0 millionPhiladelphia portfolio acquisition announced in this community, of which $43.8 million has been invested through December 31, 2015. Construction was completed during the third quarter, in line with plan. Leasing activity during the fourth quarter was in-line with underwriting. Amenity finishes, including completion of a fitness center and finishesApril 2018. This acquisition will increase our exposure to an outdoor rooftop terrace, are scheduled to be completed in the summer of 2016.lease-up risk by approximately 100 apartment homes.

We expect our total redevelopmentdevelopment and developmentredevelopment spending to range from $180$225 million to $220$275 million for the year ending December 31, 2016.2019.
Financing Activities
For the year ended December 31, 2015,2018, our net cash used in financing activities of $167.2$588.2 million was primarily attributed to principal paymentsthe items discussed below.
Net borrowings on our revolving credit facility primarily relate to the timing of short-term working capital needs. During the year ended December 31, 2018, we repaid the $250.0 million term loan in full.
Proceeds from non-recourse property debt borrowings during the year consisted of the closing of 14 fixed-rate, amortizing, non-recourse property loans dividends paidtotaling $982.4 million. On a weighted basis, the term of these loans averaged 9.4 years and their interest rates averaged 4.03%, 112 basis points more than the corresponding Treasury rate at the time of pricing. The net effect of 2018 fixed-rate property debt refinancing activities has been to common security holderslower our weighted average fixed interest rate by 42 basis points since December 31, 2017, to 4.22%.
Proceeds from non-recourse property debt borrowing during the period also included the closing of four non-recourse, variable-rate property loans totaling $245.6 million. On a weighted basis, the term of these loans averaged 5 years and distributions paidthe loans bear interest at a weighted average rate of 30-day LIBOR plus 1.20%. The five-year terms fill a void in our laddered maturities and, taken together with the repayment of the variable-rate term loan, reduce our exposure to noncontrolling interests, partially offset by proceeds fromchanging short-term interest rates to approximately 9.75% of our issuance of common securities and proceeds from property loans.leverage.

40


Principal payments on property loans during the year totaled $514.3$976.1 million, and included $79.8consisting of $82.4 million of scheduled principal amortization $166.0and repayments of $893.7 million.
Aimco common share repurchase, and OP unit and preferred partnership unit redemptions during the year totaled $373.6 million related to the expansion of our unencumbered asset pool,(plus an additional $20.7 million, which settled in January 2019) and the remainder primarily related to debt payoffs in connection with dispositions. We like the discipline of financing our investments in real estate through the use of amortizing, fixed-rate property debt, as the amortization gradually reduces our leverage, reduces our refunding risk and the fixed-rate provides a hedge against increases in interest rates. Our net$9.9 million, respectively.
Net cash used in financing activities also includes $252.6$275.3 million of dividend and distribution payments to equity holders, as further detailed in the table below.
Equity and Partners’ Capital Transactions
The following table presents our dividend andthe Aimco Operating Partnership’s distribution activity (including distributions paid to Aimco) during the year ended December 31, 20152018 (dollars in thousands):
 2015
Cash distributions paid by the Aimco Operating Partnership to holders of noncontrolling interests in consolidated real estate partnerships$43,757
Cash distributions paid by the Aimco Operating Partnership to preferred unitholders (1)18,042
Cash distributions paid by the Aimco Operating Partnership to common unitholders (2)190,783
Total cash distributions paid by the Aimco Operating Partnership$252,582
  
Cash distributions paid by Aimco to holders of noncontrolling interests in consolidated real estate partnerships$43,757
Cash distributions paid by Aimco to holders of common OP Units13,644
Cash dividends paid by Aimco to preferred stockholders11,099
Cash dividends paid by Aimco to common stockholders184,082
Total cash dividends and distributions paid by Aimco$252,582
  
Cash distributions paid to holders of noncontrolling interests in consolidated real estate partnerships$9,469
Cash distributions paid by the Aimco Operating Partnership to preferred unitholders (1)16,334
Cash distributions paid by the Aimco Operating Partnership to common unitholders (2)249,491
Total cash distributions paid by the Aimco Operating Partnership$275,294
(1)$11.18.6 million represented distributions to Aimco, and $6.9$7.7 million represented distributions paid to holders of OP Units.
(2)$184.1237.5 million represented distributions to Aimco, and $6.7$11.9 million represented distributions paid to holders of OP Units.

The following table presents Aimco’s dividend activity during the year ended December 31, 2018 (dollars in thousands):
Pursuant
Cash distributions paid to holders of noncontrolling interests in consolidated real estate partnerships$9,469
Cash distributions paid to holders of OP Units (other than Aimco)19,727
Cash dividends paid by Aimco to preferred stockholders8,594
Cash dividends paid by Aimco to common stockholders237,504
Total cash dividends and distributions paid by Aimco$275,294
During the year ended December 31, 2018, we repurchased 8.2 million shares of common stock and initiated trades that settled in the month ended January 31, 2019, for an additional 0.5 million shares, all for $394.1 million, approximately a 20% discount to an At-The-Market offering program activeAimco’s estimated NAV at the time of repurchase. The unsettled shares are included in Class A Common Stock outstanding at December 31, 2015, Aimco has the capacity to issue up to 3.5 million shares of its Common Stock. In the event of any such issuances, Aimco would contribute the net proceeds to the Aimco Operating Partnership in exchange for a number of partnership common units equal to the number of shares issued and sold. Additionally, the Aimco Operating Partnership and Aimco have a shelf registration statement that provides for the issuance of debt securities by the Aimco Operating Partnership and equity securities by Aimco.2018.
During January 2015, Aimco completed a public offering resulting in the sale of 9,430,000 shares of its Common Stock, par value $0.01 per share, in an underwritten public offering, generating net proceeds of approximately $366.6 million.  Aimco contributed the net proceeds from the sale of Common Stock to the Aimco Operating Partnership in exchange for a number of common partnership units equal to the number of shares of Common Stock issued.
Contractual Obligations
This table summarizes information contained elsewhere in this Annual Report on Form 10-K regarding payments due under contractual obligations and commitments as of December 31, 20152018 (in thousands):
 TotalLess than One Year2-3 Years4-5 YearsMore than Five Years
Long-term debt (1)$3,846,160
$325,973
$682,639
$952,213
$1,885,335
Interest related to long-term debt (2)1,082,198
190,390
320,217
219,171
352,420
Office space lease obligations6,863
3,061
3,423
379

Ground lease obligations (3)72,987
795
1,890
2,426
67,876
Construction obligations (4)110,000
100,286
9,714


Total$5,118,208
$620,505
$1,017,883
$1,174,189
$2,305,631
      
 TotalLess than One Year1-3 Years3-5 YearsMore than Five Years
Non-recourse property debt - Real Estate (1)$3,937,000
$246,345
$839,556
$741,941
$2,109,158
Revolving credit facility borrowings (2)160,360


160,360

Interest related to long-term debt - Real Estate (3)1,066,558
167,382
290,105
205,471
403,600
Office space lease obligations22,874
2,237
5,540
4,453
10,644
Ground lease obligations (4)434,056
2,114
4,789
4,984
422,169
Construction obligations (5)206,957
164,549
42,408


Total$5,827,805
$582,627
$1,182,398
$1,117,209
$2,945,571
      
(1)Includes scheduled principal amortization and maturity payments related to our long-term debt.non-recourse property debt secured by communities in our Real Estate portfolio.
(2)Includes outstanding borrowings on our revolving credit facility assuming repayment at the contractual maturity date. Our revolving credit facility is subject to an annual commitment fee (0.25% of aggregate commitments), which is not included in the amounts above.
(3)
Includes interest related to both fixed ratefixed-rate and variable rate debt.variable-rate non-recourse property debt, and our variable-rate revolving credit facility borrowings. Interest related to variable ratevariable-rate debt is estimated based on the rate effective at December 31, 2015.2018. Refer to Note 54 to the consolidated financial statements in Item 8 for a description of average interest rates associated with our debt.
(3)(4)These ground leases matureexpire in years ranging from 20372070 to 2084.2117.

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(4)(5)
Represents estimated obligations pursuant to construction contracts related to our redevelopment, development redevelopment and other capital projects.spending. Refer to Note 75 to the consolidated financial statements in Item 8 for additional information regarding these obligations.
In addition to the amounts presented in the table above, at December 31, 2015,2018, we had $159.8$125.0 million (liquidation value) of Aimco’s perpetual preferred stock outstanding with a weighted averagean annual dividend yield of 6.9%, which we expect to, but are not obligated to, redeem during 2019, and $87.9$101.3 million (liquidation value) of redeemable preferred OP Units of the Aimco Operating Partnership outstanding with annual distribution yields ranging from 1.9%1.92% to 8.8%. The dividends and distributions that accrue on the perpetual preferred stock and redeemable preferred OP Units are cumulative. As of December 31, 2015, we had no accrued dividends or distributions related to these securities.cumulative and are paid quarterly.
Additionally, we may enter into commitments to purchase goods and services in connection with the operations of our apartment communities. Those commitments generally have terms of one year or less and reflect expenditure levels comparable to our historical expenditures.
Future Capital Needs
In addition to the items set forth in “Contractual Obligations” above, we expect to fund any future acquisitions, redevelopment, and development projects, and other capital spending principally with proceeds from apartment community sales, (including tax-free exchange proceeds), short-term borrowings, debt and equity financing and operating cash flows. Our near-term business plan does not contemplate the issuance of equity.
Item 7A. Quantitative and Qualitative Disclosures About Market Risk
Our primarychief market risks are refunding risk, exposurethat is to the availability of property debt or other cash sources to refund maturing property debt, and to changesre-pricing risk, that is the possibility of increases in base interest rates and credit risk spreads. Our liabilities are not subject to any other material market rate or price risks. We use predominantly long-term,long-dated, fixed-rate, amortizing, non-recourse property debt in order to avoid the refunding and repricing risks of short-term borrowings. We use short-term debt financing and working capital primarily to fund short-term uses and acquisitions and generally expect to refinance such borrowings with cash from operating activities, proceeds from apartment community sales, long-term debt or equity financings. We make limited use of other derivative financial instruments and we do not use them for trading or other speculative purposes.
Market Risk Associated with Loans Secured by Our Real Estate Portfolio
As of December 31, 2015,2018, on a consolidated basis, we had approximately $111.9$260.1 million of variable-rate indebtedness outstanding.property-level debt outstanding and $160.4 million of variable-rate borrowings under our revolving credit facility. We estimate that an increasea change in 30-day LIBOR of 100 basis points with constant credit risk spreads would result in our net income and the amount ofreduce or increase net income attributable to our common security holders (including Aimco common stockholders and the Aimco Operating Partnership’s common unitholders) being reduced (or the amounts of net loss and net loss attributable to our common equity holders being increased)unitholders by approximately $0.9$4.2 million on an annual basis.
At December 31, 2015,2018, we had approximately $137.7$72.6 million in cash and cash equivalents and restricted cash, a portion of which bearbears interest at variable rates, andwhich may mitigate the effect of an increaseoffset somewhat a change in variable rates on our variable-rate indebtednessdebt discussed above.

We estimate the fair value for ourof debt instruments as described in Note 611 to the consolidated financial statements in Item 8. The estimated aggregate fair value of our consolidated total indebtedness was approximately $4.0$4.1 billion at December 31, 2015.2018, inclusive of a $43.8 million mark-to-market liability. The combined carrying value of our consolidated debt was $3.9 billionmark-to-market liability at December 31, 2015. 2017 was $92.1 million.
If market rates for ourconsolidated fixed-rate debt in our Real Estate segment were higher by 100 basis points with constant credit risk spreads, the estimated fair value of ourconsolidated debt discussed above would have decreaseddecrease from $4.0$4.1 billion in the aggregate to $3.9$4.0 billion. If market rates for ourconsolidated debt discussed above were lower by 100 basis points with constant credit risk spreads, the estimated fair value of ourconsolidated fixed-rate debt would have increasedincrease from $4.0$4.1 billion in the aggregate to $4.1$4.2 billion.
Item 8. Financial Statements and Supplementary Data
The independent registered public accounting firm’s reports, consolidated financial statements and schedule listed in the accompanying index“Index to Financial Statements” on page F-1 of this Annual Report are filed as part of this report and incorporated herein by this reference. See “Index to Financial Statements” on page F-1 of this Annual Report.
Item 9. Changes in and Disagreements With Accountants on Accounting and Financial Disclosure
None.

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Item 9A. Controls and Procedures
Aimco
Disclosure Controls and Procedures
Aimco’s management, with the participation of Aimco’s chief executive officer and chief financial officer, has evaluated the effectiveness of its disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”))Act), as of the end of the period covered by this report. Based on such evaluation, Aimco’s chief executive officer and chief financial officer have concluded that, as of the end of such period, Aimco’s disclosure controls and procedures are effective.
Management’s Report on Internal Control Over Financial Reporting
Aimco’s management is responsible for establishing and maintaining adequate internal control over financial reporting. Internal control over financial reporting is defined in Rule 13a-15(f) and 15d-15(f) under the Exchange Act as a process designed by, or under the supervision of, our principal executive and principal financial officers and effected by our Board of Directors, management and other personnel to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles and includes those policies and procedures that:
pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of assets;
provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures are being made only in accordance with authorizations of our management and directors; and
provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of assets that could have a material effect on the financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Projections of any evaluation of effectiveness to future periods are subject to the risks that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
Management assessed the effectiveness of Aimco’s internal control over financial reporting as of December 31, 2015.2018. In making this assessment, management used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control-Integrated Framework (2013 Framework).
Based on their assessment, management concluded that, as of December 31, 2015,2018, Aimco’s internal control over financial reporting is effective.
Aimco’s independent registered public accounting firm has issued an attestation report on Aimco’s internal control over financial reporting.
Changes in Internal Control Over Financial Reporting
There has been no change in Aimco’s internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the fourth quarter of 20152018 that has materially affected, or is reasonably likely to materially affect, Aimco’s internal control over financial reporting.


43


Report of Independent Registered Public Accounting Firm

TheTo the Shareholders and the Board of Directors and Stockholders of
Apartment Investment and Management Company
Opinion on Internal Control over Financial Reporting
We have audited Apartment Investment and Management Company’s (the “Company”) internal control over financial reporting as of December 31, 2015,2018, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 Framework)“2013 framework,” (the COSO criteria). In our opinion, Apartment Investment and Management Company (the Company) maintained, in all material respects, effective internal control over financial reporting as of December 31, 2018, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Company as of December 31, 2018 and 2017, and the related consolidated statements of operations, comprehensive income, equity and cash flows for each of the three years in the period ended December 31, 2018 and the related notes and financial statement schedule listed in the accompanying Index to Financial Statements of the Company and our report dated February 19, 2019 expressed an unqualified opinion thereon.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management’s Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States).PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.
Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control Over Financial Reporting
A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2015, based on the COSO criteria.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of the Company as of December 31, 2015 and 2014, and the related consolidated statements of operations, comprehensive income, equity, and cash flows for each of the three years in the period ended December 31, 2015, and our report dated February 26, 2016 expressed an unqualified opinion thereon.
/s/ ERNST & YOUNG LLP

Denver, Colorado
February 26, 201619, 2019


44


The Aimco Operating Partnership
Disclosure Controls and Procedures
The Aimco Operating Partnership’s management, with the participation of the chief executive officer and chief financial officer of Aimco, who are the equivalent of the Aimco Operating Partnership’s chief executive officer and chief financial officer, respectively, has evaluated the effectiveness of the Aimco Operating Partnership’s disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”))Act) as of the end of the period covered by this report. Based on such evaluation, the chief executive officer and chief financial officer of Aimco have concluded that, as of the end of such period, the Aimco Operating Partnership’s disclosure controls and procedures are effective.
Management’s Report on Internal Control Over Financial Reporting
Management of the Aimco Operating Partnership is responsible for establishing and maintaining adequate internal control over financial reporting. Internal control over financial reporting is defined in Rule 13a-15(f) and 15d-15(f) under the Exchange Act as a process designed by, or under the supervision of, our principal executive and principal financial officers and effected by our Board of Directors, management and other personnel to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles and includes those policies and procedures that:
pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of assets;
provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures are being made only in accordance with authorizations of our management and directors; and
provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of assets that could have a material effect on the financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Projections of any evaluation of effectiveness to future periods are subject to the risks that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
Management assessed the effectiveness of the Aimco Operating Partnership’s internal control over financial reporting as of December 31, 2015.2018. In making this assessment, management used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control-Integrated Framework (2013 Framework).
Based on their assessment, management concluded that, as of December 31, 2015,2018, the Aimco Operating Partnership’s internal control over financial reporting is effective.
The Aimco Operating Partnership’s independent registered public accounting firm has issued an attestation report on the Aimco Operating Partnership’s internal control over financial reporting.
Changes in Internal Control Over Financial Reporting
There has been no change in the Aimco Operating Partnership’s internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the fourth quarter of 20152018 that has materially affected, or is reasonably likely to materially affect, the Aimco Operating Partnership’s internal control over financial reporting.



45


Report of Independent Registered Public Accounting Firm

TheTo the Partners and the Board of Directors of
AIMCO Properties, L.P.
Opinion on Internal Control over Financial Reporting
We have audited AIMCO Properties, L.P.’s (the “Partnership”) internal control over financial reporting as of December 31, 2015,2018, based on criteria established in Internal Control-Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 Framework)“2013 framework,” (the COSO criteria). In our opinion, AIMCO Properties, L.P. (the Partnership) maintained, in all material respects, effective internal control over financial reporting as of December 31, 2018, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Partnership as of December 31, 2018 and 2017, and the related consolidated statements of operations, comprehensive income, partners’ capital and cash flows for each of the three years in the period ended December 31, 2018 and the related notes and financial statement schedule listed in the accompanying Index to Financial Statements of the Partnership and our report dated February 19, 2019 expressed an unqualified opinion thereon.

Basis for Opinion

The Partnership’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management’s Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Partnership’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Partnership in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States).PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.

Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
In our opinion, the Partnership maintained, in all material respects, effective internal control over financial reporting as of December 31, 2015, based on the COSO criteria.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of the Partnership as of December 31, 2015 and 2014, and the related consolidated statements of operations, comprehensive income, partners’ capital, and cash flows for each of the three years in the period ended December 31, 2015, and our report dated February 26, 2016 expressed an unqualified opinion thereon.
/s/ ERNST & YOUNG LLP

Denver, Colorado
February 26, 201619, 2019

46


Item 9B. Other Information
None.
PART IIIApartment Investment and Management Company
Opinion on Internal Control over Financial Reporting
We have audited Apartment Investment and Management Company’s internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission “2013 framework,” (the COSO criteria). In our opinion, Apartment Investment and Management Company (the Company) maintained, in all material respects, effective internal control over financial reporting as of December 31, 2018, based on the COSO criteria.

Item 10. Directors, Executive Officers and Corporate Governance
Each memberWe also have audited, in accordance with the standards of the boardPublic Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Company as of December 31, 2018 and 2017, and the related consolidated statements of operations, comprehensive income, equity and cash flows for each of the three years in the period ended December 31, 2018 and the related notes and financial statement schedule listed in the accompanying Index to Financial Statements of the Company and our report dated February 19, 2019 expressed an unqualified opinion thereon.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management’s Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.
Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control Over Financial Reporting
A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of Aimco also is a directorthe company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the general partnercompany’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
/s/ ERNST & YOUNG LLP

Denver, Colorado
February 19, 2019


The Aimco Operating Partnership
Disclosure Controls and Procedures
The Aimco Operating Partnership’s management, with the participation of the chief executive officer and chief financial officer of Aimco, who are the equivalent of the Aimco Operating Partnership. The officersPartnership’s chief executive officer and chief financial officer, respectively, has evaluated the effectiveness of the Aimco Operating Partnership’s disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) as of the end of the period covered by this report. Based on such evaluation, the chief executive officer and chief financial officer of Aimco are also the officershave concluded that, as of the general partnerend of such period, the Aimco Operating Partnership’s disclosure controls and procedures are effective.
Management’s Report on Internal Control Over Financial Reporting
Management of the Aimco Operating Partnership is responsible for establishing and holdmaintaining adequate internal control over financial reporting. Internal control over financial reporting is defined in Rule 13a-15(f) and 15d-15(f) under the same titles. The information requiredExchange Act as a process designed by, this item for both Aimcoor under the supervision of, our principal executive and principal financial officers and effected by our Board of Directors, management and other personnel to provide reasonable assurance regarding the reliability of financial reporting and the Aimco Operating Partnership is presented jointly underpreparation of financial statements for external purposes in accordance with generally accepted accounting principles and includes those policies and procedures that:
pertain to the captions “Boardmaintenance of Directorsrecords that, in reasonable detail, accurately and Executive Officers,” “Corporate Governance Matters - Codefairly reflect the transactions and dispositions of Ethics,” “Other Matters - Section 16(a) Beneficial Ownership Reporting Compliance,” “Corporate Governance Matters - Nominatingassets;
provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and Corporate Governance Committee,” “Corporate Governance Matters - Audit Committee”that receipts and “Corporate Governance Matters - Audit Committee Financial Expert”expenditures are being made only in accordance with authorizations of our management and directors; and
provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of assets that could have a material effect on the proxy statement for Aimco’s 2016 annual meetingfinancial statements.
Because of stockholders and is incorporated herein by reference.
Item 11. Executive Compensationits inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Projections of any evaluation of effectiveness to future periods are subject to the risks that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
The information required by this item is presented underManagement assessed the captions “Compensation Discussion & Analysis,” “Compensation and Human Resources Committee Report to Stockholders,” “Summary Compensation Table,” “Grants of Plan-Based Awards in 2015,” “Outstanding Equity Awards at Fiscal Year End 2015,” “Option Exercises and Stock Vested in 2015,” “Potential Payments Upon Termination or Change in Control” and “Corporate Governance Matters - Director Compensation” in the proxy statement for Aimco’s 2016 annual meeting of stockholders and is incorporated herein by reference.
Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters
The information required by this item, for both Aimco and the Aimco Operating Partnership, is presented under the captions “Security Ownership of Certain Beneficial Owners and Management” and “Securities Authorized for Issuance Under Equity Compensation Plans” in the proxy statement for Aimco’s 2016 annual meeting of stockholders and is incorporated herein by reference. In addition, as of February 25, 2016, Aimco, through its consolidated subsidiaries, held 95.2%effectiveness of the Aimco Operating Partnership’s common partnership units outstanding.
Item 13.internal control over financial reporting as of December 31, 2018. In making this assessment, management used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Certain Relationships and Related Transactions, and Director IndependenceInternal Control-Integrated Framework (2013 Framework).
Based on their assessment, management concluded that, as of December 31, 2018, the Aimco Operating Partnership’s internal control over financial reporting is effective.
The information required by this item is presentedAimco Operating Partnership’s independent registered public accounting firm has issued an attestation report on the Aimco Operating Partnership’s internal control over financial reporting.
Changes in Internal Control Over Financial Reporting
There has been no change in the Aimco Operating Partnership’s internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the caption “Certain RelationshipsExchange Act) during the fourth quarter of 2018 that has materially affected, or is reasonably likely to materially affect, the Aimco Operating Partnership’s internal control over financial reporting.

Report of Independent Registered Public Accounting Firm

To the Partners and Related Transactions”the Board of Directors of
AIMCO Properties, L.P.
Opinion on Internal Control over Financial Reporting
We have audited AIMCO Properties, L.P.’s internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission “2013 framework,” (the COSO criteria). In our opinion, AIMCO Properties, L.P. (the Partnership) maintained, in all material respects, effective internal control over financial reporting as of December 31, 2018, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Partnership as of December 31, 2018 and “Corporate Governance Matters - Independence2017, and the related consolidated statements of Directors”operations, comprehensive income, partners’ capital and cash flows for each of the three years in the proxyperiod ended December 31, 2018 and the related notes and financial statement for Aimco’s 2016 annual meeting of stockholders and is incorporated herein by reference.
Item 14. Principal Accountant Fees and Services
The information required by this item is presented under the caption “Principal Accountant Fees and Services”schedule listed in the proxy statement for Aimco’s 2016 annual meetingaccompanying Index to Financial Statements of stockholdersthe Partnership and is incorporated herein by reference.
PART IV
Item 15.Exhibits and Financial Statement Schedules
(a)(1)The financial statements listed in the Index to Financial Statements on Page F-1 of this report are filed as part of this report and incorporated herein by reference.
(a)(2)The financial statement schedule listed in the Index to Financial Statements on Page F-1 of this report is filed as part of this report and incorporated herein by reference.
(a)(3)The Exhibit Index is incorporated herein by reference.

47


INDEX TO EXHIBITS (1) (2)
EXHIBIT NO.DESCRIPTION
3.1Charter (Exhibit 3.1 to Aimco’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2015, is incorporated herein by this reference)
3.2Amended and Restated Bylaws (Exhibit 3.1 to Aimco’s Current Report on Form 8-K dated January 26, 2016, is incorporated herein by this reference)
10.1Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of July 29, 1994, as amended and restated as of February 28, 2007 (Exhibit 10.1 to Aimco’s Annual Report on Form 10-K for the year ended December 31, 2006, is incorporated herein by this reference)
10.2First Amendment to Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of December 31, 2007 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated December 31, 2007, is incorporated herein by this reference)
10.3Second Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of July 30, 2009 (Exhibit 10.1 to Aimco’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2009, is incorporated herein by this reference)
10.4Third Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of September 2, 2010 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated September 3, 2010, is incorporated herein by this reference)
10.5Fourth Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of July 26, 2011 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated July 26, 2011, is incorporated herein by this reference)
10.6Fifth Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of August 24, 2011 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated August 24, 2011, is incorporated herein by this reference)
10.7Sixth Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of December 31, 2011 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated December 31, 2011, is incorporated herein by this reference)
10.8Seventh Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of May 13, 2014 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated May 15, 2014, is incorporated herein by this reference)
10.9Eighth Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of October 31, 2014 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated November 4, 2014, is incorporated herein by this reference)
10.10Senior Secured Credit Agreement, dated as of December 13, 2011, among Aimco, the Aimco Operating Partnership, AIMCO/Bethesda Holdings, Inc., the lenders from time to time party thereto, KeyBank National Association, as administrative agent, swing line lender and a letter of credit issuer, Wells Fargo Bank, N.A., as syndication agent and Bank of America, N.A. and Regions Bank, as co-documentation agents (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated December 13, 2011, is incorporated herein by this reference)
10.11First Amendment to Senior Secured Credit Agreement, dated as of April 5, 2013, by and among Aimco, the Aimco Partnership, AIMCO/Bethesda Holdings, Inc., Keybank National Association, as Agent for itself and the other lenders from time to time a party to the Senior Secured Credit Agreement (Exhibit 10.1 to Aimco’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2013, is incorporated herein by this reference)
10.12Second Amendment to Credit Agreement and Joinder to Guaranty, dated as of September 30, 2013, among Aimco, the Aimco Operating Partnership, AIMCO/Bethesda Holdings, Inc., the guarantors party thereto, the lenders party thereto and KeyBank National Association, as administrative agent (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated September 30, 2013, is incorporated herein by this reference)
10.13Master Indemnification Agreement, dated December 3, 2001, by and among Aimco, the Aimco Operating Partnership., XYZ Holdings LLC, and the other parties signatory thereto (Exhibit 2.3 to Aimco’s Current Report on Form 8-K, dated December 6, 2001, is incorporated herein by this reference)
10.14Tax Indemnification and Contest Agreement, dated December 3, 2001, by and among Aimco, National Partnership Investments, Corp., and XYZ Holdings LLC and the other parties signatory thereto (Exhibit 2.4 to Aimco’s Current Report on Form 8-K, dated December 6, 2001, is incorporated herein by this reference)
10.15Employment Contract executed on December 29, 2008, by and between the Aimco Operating Partnership and Terry Considine (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated December 29, 2008, is incorporated herein by this reference)*
10.16Apartment Investment and Management Company 1997 Stock Award and Incentive Plan (October 1999) (Exhibit 10.26 to Aimco’s Annual Report on Form 10-K for the year ended December 31, 1999, is incorporated herein by this reference)*

48


10.17Form of Restricted Stock Agreement (1997 Stock Award and Incentive Plan) (Exhibit 10.11 to Aimco’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 1997, is incorporated herein by this reference)*
10.18Form of Incentive Stock Option Agreement (1997 Stock Award and Incentive Plan) (Exhibit 10.42 to Aimco’s Annual Report on Form 10-K for the year ended December 31, 1998, is incorporated herein by this reference)*
10.192007 Stock Award and Incentive Plan (Appendix A to Aimco’s Proxy Statement on Schedule 14A filed with the Securities and Exchange Commission on March 20, 2007 is incorporated herein by this reference)*
10.20Form of Restricted Stock Agreement (2007 Stock Award and Incentive Plan) (Exhibit 10.2 to Aimco’s Current Report on Form 8-K, dated April 30, 2007, is incorporated herein by this reference)*
10.21Form of Non-Qualified Stock Option Agreement (2007 Stock Award and Incentive Plan) (Exhibit 10.3 to Aimco’s Current Report on Form 8-K, dated April 30, 2007, is incorporated herein by this reference)*
10.222007 Employee Stock Purchase Plan (Appendix B to Aimco’s Proxy Statement on Schedule 14A filed with the Securities and Exchange Commission on March 20, 2007, is incorporated herein by this reference)*
10.232015 Stock Award and Incentive Plan (Appendix A to Aimco’s Proxy Statement on Schedule 14A filed with the Securities and Exchange Commission on March 13, 2015, is incorporated herein by this reference)*
10.24Form of Performance Restricted Stock Agreement (2015 Stock Award and Incentive Plan)
10.25Form of Restricted Stock Agreement (2015 Stock Award and Incentive Plan)
10.26Form of Non-Qualified Stock Option Agreement ( 2015 Stock Award and Incentive Plan)
21.1List of Subsidiaries
23.1Consent of Independent Registered Public Accounting Firm - Aimco
23.2Consent of Independent Registered Public Accounting Firm - Aimco Operating Partnership
31.1Certification of Chief Executive Officer pursuant to Securities Exchange Act Rules 13a-14(a)/15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 - Aimco
31.2Certification of Chief Financial Officer pursuant to Securities Exchange Act Rules 13a-14(a)/15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 - Aimco
31.3Certification of Chief Executive Officer pursuant to Securities Exchange Act Rules 13a-14(a)/15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 - Aimco Operating Partnership
31.4Certification of Chief Financial Officer pursuant to Securities Exchange Act Rules 13a-14(a)/15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 - Aimco Operating Partnership
32.1Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 - Aimco
32.2Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 - Aimco
32.3Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 - Aimco Operating Partnership
32.4Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 - Aimco Operating Partnership
99.1Agreement re: disclosure of long-term debt instruments - Aimco
99.2Agreement re: disclosure of long-term debt instruments - Aimco Operating Partnership
101XBRL (Extensible Business Reporting Language). The following materials from Aimco’s and the Aimco Operating Partnership’s combined Annual Report on Form 10-K for the year ended December 31, 2015, formatted in XBRL: (i) consolidated balance sheets; (ii) consolidated statements of operations; (iii) consolidated statements of comprehensive income; (iv) consolidated statements of equity and consolidated statements of partners’ capital; (v) consolidated statements of cash flows; (vi) notes to the consolidated financial statements; and (vii) financial statement schedule (3).
(1)Schedule and supplemental materials to the exhibits have been omitted but will be provided to the Securities and Exchange Commission upon request.
(2)The Commission file numbers for exhibits is 001-13232 (Aimco) and 0-24497 (the Aimco Operating Partnership), and all such exhibits remain available pursuant to the Records Control Schedule of the Securities and Exchange Commission.
(3)As provided in Rule 406T of Regulation S-T, this information is furnished and not filed for purposes of Sections 11 and 12 of the Securities Act of 1933 and Section 18 of the Securities Exchange Act of 1934.
*Management contract or compensatory plan or arrangement

49


SIGNATURESour report dated February 19, 2019 expressed an unqualified opinion thereon.

PursuantBasis for Opinion

The Partnership’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management’s Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Partnership’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the requirements of Section 13 or 15(d)Partnership in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange ActCommission and the PCAOB.
We conducted our audit in accordance with the standards of 1934, each registrant has duly caused this reportthe PCAOB. Those standards require that we plan and perform the audit to be signed on its behalf by the undersigned, thereunto duly authorized.obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.

Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.
APARTMENT INVESTMENT AND
MANAGEMENT COMPANY
By:/s/ TERRY CONSIDINE    
Terry Considine
Chairman of the Board and
Chief Executive Officer
Date:February 26, 2016
Definition and Limitations of Internal Control Over Financial Reporting
AIMCO PROPERTIES, L.P.
By:AIMCO-GP, Inc., its General Partner
By:/s/ TERRY CONSIDINE    
Terry Considine
Chairman of the Board and
Chief Executive Officer
Date:February 26, 2016

50


Pursuantfinancial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the requirementsmaintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the Securities Exchange Actassets of 1934, this report has been signed below by the following persons on behalfcompany; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of each registrantfinancial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the capacitiescompany; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the dates indicated.financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
/s/ ERNST & YOUNG LLP

Denver, Colorado
SignatureTitleDate
APARTMENT INVESTMENT AND MANAGEMENT COMPANY
AIMCO PROPERTIES, L.P.
By:AIMCO-GP, Inc., its General Partner
/s/ TERRY CONSIDINEChairman of the Board andFebruary 26, 2016
Terry Considine
Chief Executive Officer
(principal executive officer)
/s/ PAUL BELDINExecutive Vice President andFebruary 26, 2016
Paul Beldin
Chief Financial Officer
(principal financial officer)
/s/ ANDREW HIGDONSenior Vice President andFebruary 26, 2016
Andrew Higdon
Chief Accounting Officer
(principal accounting officer)
/s/ JAMES N. BAILEYDirectorFebruary 26, 2016
James N. Bailey
/s/ THOMAS L. KELTNERDirectorFebruary 26, 2016
Thomas L. Keltner
/s/ J. LANDIS MARTINDirectorFebruary 26, 2016
J. Landis Martin
/s/ ROBERT A. MILLERDirectorFebruary 26, 2016
Robert A. Miller
/s/ KATHLEEN M. NELSONDirectorFebruary 26, 2016
Kathleen M. Nelson
/s/ MICHAEL A. STEINDirectorFebruary 26, 2016
Michael A. Stein


51


APARTMENT INVESTMENT AND MANAGEMENT COMPANY
AIMCO PROPERTIES, L.P.February 19, 2019


Item 9B. Other Information
INDEX TO FINANCIAL STATEMENTSNone.



F-1



REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


The Board of Directors and Stockholders of
Apartment Investment and Management Company

Opinion on Internal Control over Financial Reporting
We have audited Apartment Investment and Management Company’s internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control-Integrated Framework issued by the accompanying consolidated balance sheetsCommittee of Sponsoring Organizations of the Treadway Commission “2013 framework,” (the COSO criteria). In our opinion, Apartment Investment and Management Company (the “Company”)Company) maintained, in all material respects, effective internal control over financial reporting as of December 31, 20152018, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Company as of December 31, 2018 and 2014,2017, and the related consolidated statements of operations, comprehensive income, equity and cash flows for each of the three years in the period ended December 31, 20152018 and the related notes and financial statement schedule listed in the accompanying Index to Financial Statements of the Company and our report dated February 19, 2019 expressed an unqualified opinion thereon.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management’s Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.
Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control Over Financial Reporting
A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
/s/ ERNST & YOUNG LLP

Denver, Colorado
February 19, 2019


The Aimco Operating Partnership
Disclosure Controls and Procedures
The Aimco Operating Partnership’s management, with the participation of the chief executive officer and chief financial officer of Aimco, who are the equivalent of the Aimco Operating Partnership’s chief executive officer and chief financial officer, respectively, has evaluated the effectiveness of the Aimco Operating Partnership’s disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) as of the end of the period covered by this report. Based on such evaluation, the chief executive officer and chief financial officer of Aimco have concluded that, as of the end of such period, the Aimco Operating Partnership’s disclosure controls and procedures are effective.
Management’s Report on Internal Control Over Financial Reporting
Management of the Aimco Operating Partnership is responsible for establishing and maintaining adequate internal control over financial reporting. Internal control over financial reporting is defined in Rule 13a-15(f) and 15d-15(f) under the Exchange Act as a process designed by, or under the supervision of, our principal executive and principal financial officers and effected by our Board of Directors, management and other personnel to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles and includes those policies and procedures that:
pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of assets;
provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures are being made only in accordance with authorizations of our management and directors; and
provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of assets that could have a material effect on the financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Projections of any evaluation of effectiveness to future periods are subject to the risks that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
Management assessed the effectiveness of the Aimco Operating Partnership’s internal control over financial reporting as of December 31, 2018. In making this assessment, management used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control-Integrated Framework (2013 Framework).
Based on their assessment, management concluded that, as of December 31, 2018, the Aimco Operating Partnership’s internal control over financial reporting is effective.
The Aimco Operating Partnership’s independent registered public accounting firm has issued an attestation report on the Aimco Operating Partnership’s internal control over financial reporting.
Changes in Internal Control Over Financial Reporting
There has been no change in the Aimco Operating Partnership’s internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the fourth quarter of 2018 that has materially affected, or is reasonably likely to materially affect, the Aimco Operating Partnership’s internal control over financial reporting.

Report of Independent Registered Public Accounting Firm

To the Partners and the Board of Directors of
AIMCO Properties, L.P.
Opinion on Internal Control over Financial Reporting
We have audited AIMCO Properties, L.P.’s internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission “2013 framework,” (the COSO criteria). In our opinion, AIMCO Properties, L.P. (the Partnership) maintained, in all material respects, effective internal control over financial reporting as of December 31, 2018, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Partnership as of December 31, 2018 and 2017, and the related consolidated statements of operations, comprehensive income, partners’ capital and cash flows for each of the three years in the period ended December 31, 2018 and the related notes and financial statement schedule listed in the accompanying Index to Financial Statements of the Partnership and our report dated February 19, 2019 expressed an unqualified opinion thereon.

Basis for Opinion

The Partnership’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management’s Report on Internal Control Over Financial Reporting. Our auditsresponsibility is to express an opinion on the Partnership’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Partnership in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.

Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
/s/ ERNST & YOUNG LLP

Denver, Colorado
February 19, 2019

Item 9B. Other Information
None.
PART III

Item 10. Directors, Executive Officers and Corporate Governance
Each member of the board of directors of Aimco also includedis a director of the general partner of the Aimco Operating Partnership. The officers of Aimco are also the officers of the general partner of the Aimco Operating Partnership and hold the same titles. The information required by this item for both Aimco and the Aimco Operating Partnership is presented jointly under the captions “Board of Directors and Executive Officers,” “Corporate Governance Matters - Code of Ethics,” “Other Matters - Section 16(a) Beneficial Ownership Reporting Compliance,” “Corporate Governance Matters - Meetings and Committees: Nominating and Corporate Governance Committee,” “Corporate Governance Matters - Meetings and Committees: Audit Committee” and “Corporate Governance Matters - Meetings and Committees: Audit Committee Financial Expert” in the proxy statement for Aimco’s 2019 annual meeting of stockholders and is incorporated herein by reference.
Item 11. Executive Compensation
The information required by this item is presented under the captions “Compensation Discussion & Analysis,” “Compensation and Human Resources Committee Report to Stockholders,” “Summary Compensation Table,” “Grants of Plan-Based Awards in 2018,” “Outstanding Equity Awards at Fiscal Year-End 2018,” “Option Exercises and Stock Vested in 2018,” “Potential Payments Upon Termination or Change in Control” and “Corporate Governance Matters - Director Compensation” in the proxy statement for Aimco’s 2019 annual meeting of stockholders and is incorporated herein by reference.
Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters
The information required by this item, for both Aimco and the Aimco Operating Partnership, is presented under the captions “Security Ownership of Certain Beneficial Owners and Management” and “Securities Authorized for Issuance Under Equity Compensation Plans” in the proxy statement for Aimco’s 2019 annual meeting of stockholders and is incorporated herein by reference. In addition, as of February 15, 2019, Aimco, through its consolidated subsidiaries, held 93.9% of the Aimco Operating Partnership’s common partnership units outstanding.
Item 13. Certain Relationships and Related Transactions, and Director Independence
The information required by this item is presented under the caption “Certain Relationships and Related Transactions” and “Corporate Governance Matters - Independence of Directors” in the proxy statement for Aimco’s 2019 annual meeting of stockholders and is incorporated herein by reference.
Item 14. Principal Accountant Fees and Services
The information required by this item is presented under the caption “Principal Accountant Fees and Services” in the proxy statement for Aimco’s 2019 annual meeting of stockholders and is incorporated herein by reference.
PART IV
Item 15. Exhibits and Financial Statement Schedules
(a)(1)The financial statements listed in the Index to Financial Statements on Page F-1 of this report are filed as part of this report and incorporated herein by reference.
(a)(2)The financial statement schedule listed in the Index to Financial Statements on Page F-1 of this report is filed as part of this report and incorporated herein by reference.
(a)(3)The Exhibit Index is incorporated herein by reference.

INDEX TO EXHIBITS (1) (2)
EXHIBIT NO.DESCRIPTION
Charter (Exhibit 3.1 to Aimco’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2018, is incorporated herein by this reference)
Amended and Restated Bylaws (Exhibit 3.1 to Aimco’s Current Report on Form 8-K dated January 26, 2016, is incorporated herein by this reference)
Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of July 29, 1994, as amended and restated as of February 28, 2007 (Exhibit 10.1 to Aimco’s Annual Report on Form 10-K for the year ended December 31, 2006, is incorporated herein by this reference)
First Amendment to Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of December 31, 2007 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated December 31, 2007, is incorporated herein by this reference)
Second Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of July 30, 2009 (Exhibit 10.1 to Aimco’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2009, is incorporated herein by this reference)
Third Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of September 2, 2010 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated September 3, 2010, is incorporated herein by this reference)
Fourth Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of July 26, 2011 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated July 26, 2011, is incorporated herein by this reference)
Fifth Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of August 24, 2011 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated August 24, 2011, is incorporated herein by this reference)
Sixth Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of December 31, 2011 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated December 31, 2011, is incorporated herein by this reference)
Seventh Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of May 13, 2014 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated May 9, 2014, is incorporated herein by this reference)
Eighth Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of October 31, 2014 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated November 4, 2014, is incorporated herein by this reference)
Ninth Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of August 16, 2016 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated August 16, 2016, is incorporated herein by this reference)
Tenth Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of January 31, 2017 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated January 31, 2017, is incorporated herein by this reference)
Second Amended and Restated Senior Secured Credit Agreement, dated as of June 30, 2017, among Aimco, the Aimco Operating Partnership, AIMCO/Bethesda Holdings, Inc., the lenders party thereto, KeyBank N.A., as administrative agent, swing line lender and a letter of credit issuer (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated June 30, 2017, is incorporated herein by this reference)
Master Indemnification Agreement, dated December 3, 2001, by and among Aimco, the Aimco Operating Partnership., XYZ Holdings LLC, and the other parties signatory thereto (Exhibit 10.2 to Aimco’s Current Report on Form 8-K, dated December 6, 2001, is incorporated herein by this reference)
Tax Indemnification and Contest Agreement, dated December 3, 2001, by and among Aimco, National Partnership Investments, Corp., and XYZ Holdings LLC and the other parties signatory thereto (Exhibit 10.3 to Aimco’s Current Report on Form 8-K, dated December 6, 2001, is incorporated herein by this reference)
Employment Contract executed on December 21, 2017, by and between the Aimco Operating Partnership and Terry Considine (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated December 21, 2017, is incorporated herein by this reference)*
Aimco Severance Policy (Exhibit 10.1 to Aimco’s Current Report on Form 8-K dated February 22, 2018, is incorporated herein by reference)*
2007 Stock Award and Incentive Plan (Appendix A to Aimco’s Proxy Statement on Schedule 14A filed with the Securities and Exchange Commission on March 20, 2007 is incorporated herein by this reference)*
Form of Restricted Stock Agreement (2007 Stock Award and Incentive Plan) (Exhibit 10.2 to Aimco’s Current Report on Form 8-K, dated April 30, 2007, is incorporated herein by this reference)*

Form of Non-Qualified Stock Option Agreement (2007 Stock Award and Incentive Plan) (Exhibit 10.3 to Aimco’s Current Report on Form 8-K, dated April 30, 2007, is incorporated herein by this reference)*
2007 Employee Stock Purchase Plan (Appendix B to Aimco’s Proxy Statement on Schedule 14A filed with the Securities and Exchange Commission on March 20, 2007, is incorporated herein by this reference)*
Aimco 2015 Stock Award and Incentive Plan (as amended and restated January 31, 2017) (Exhibit 10.2 to Aimco’s Current Report on Form 8-K, dated January 31, 2017, is incorporated herein by this reference)*
Aimco Second Amended and Restated 2015 Stock Award and Incentive Plan (as amended and restated effective February 22, 2018) (Exhibit A to Aimco’s Proxy Statement on Schedule 14A filed with the Securities and Exchange Commission on March 8, 2018, is incorporated herein by reference)*
Form of Performance Restricted Stock Agreement (2015 Stock Award and Incentive Plan) (Exhibit 10.24 to Aimco’s Annual Report on Form 10-K for the year ended December 31, 2015, is incorporated herein by this reference)*
Form of Restricted Stock Agreement (2015 Stock Award and Incentive Plan) (Exhibit 10.25 to Aimco’s Annual Report on Form 10-K for the year ended December 31, 2015, is incorporated herein by this reference)*
Form of Non-Qualified Stock Option Agreement (2015 Stock Award and Incentive Plan) (Exhibit 10.26 to Aimco’s Annual Report on Form 10-K for the year ended December 31, 2015, is incorporated herein by this reference)*
Form of LTIP Unit Agreement (2015 Stock Award and Incentive Plan) (Exhibit 10.3 to Aimco’s Current Report on Form 8-K, dated January 31, 2017, is incorporated herein by this reference)*
Form of Performance Vesting LTIP Unit Agreement (2015 Stock Award and Incentive Plan) (Exhibit 10.4 to Aimco’s Current Report on Form 8-K, dated January 31, 2017, is incorporated herein by this reference)*
Form of Non-Qualified Stock Option Agreement (2015 Stock Award and Incentive Plan) (Exhibit 10.26 to Aimco’s Annual Report on Form 10-K for the year ended December 31, 2016, is incorporated herein by this reference)*
Form of Performance Vesting LTIP II Unit Agreement (2015 Stock Award and Incentive Plan) (Exhibit 10.15 to Aimco’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2018, is incorporated herein by this reference)*
List of Subsidiaries
Consent of Independent Registered Public Accounting Firm - Aimco
Consent of Independent Registered Public Accounting Firm - Aimco Operating Partnership
Certification of Chief Executive Officer pursuant to Securities Exchange Act Rules 13a-14(a)/15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 - Aimco
Certification of Chief Financial Officer pursuant to Securities Exchange Act Rules 13a-14(a)/15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 - Aimco
Certification of Chief Executive Officer pursuant to Securities Exchange Act Rules 13a-14(a)/15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 - Aimco Operating Partnership
Certification of Chief Financial Officer pursuant to Securities Exchange Act Rules 13a-14(a)/15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 - Aimco Operating Partnership
Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 - Aimco
Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 - Aimco
Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 - Aimco Operating Partnership
Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 - Aimco Operating Partnership
Agreement regarding disclosure of long-term debt instruments - Aimco
Agreement regarding disclosure of long-term debt instruments - Aimco Operating Partnership
101XBRL (Extensible Business Reporting Language). The following materials from Aimco’s and the Aimco Operating Partnership’s combined Annual Report on Form 10-K for the year ended December 31, 2018, formatted in XBRL: (i) consolidated balance sheets; (ii) consolidated statements of operations; (iii) consolidated statements of comprehensive income; (iv) consolidated statements of equity and consolidated statements of partners’ capital; (v) consolidated statements of cash flows; (vi) notes to the consolidated financial statements; and (vii) financial statement schedule (3)
(1)Schedule and supplemental materials to the exhibits have been omitted but will be provided to the Securities and Exchange Commission upon request.
(2)The Commission file numbers for exhibits is 001-13232 (Aimco) and 0-24497 (the Aimco Operating Partnership), and all such exhibits remain available pursuant to the Records Control Schedule of the Securities and Exchange Commission.
(3)As provided in Rule 406T of Regulation S-T, this information is furnished and not filed for purposes of Sections 11 and 12

of the Securities Act of 1933 and Section 18 of the Securities Exchange Act of 1934.
*Management contract or compensatory plan or arrangement
Item 16. Form 10-K Summary
None.

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, each registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.
APARTMENT INVESTMENT AND
MANAGEMENT COMPANY
By:/s/ TERRY CONSIDINE    
Terry Considine
Chairman of the Board and
Chief Executive Officer
Date:February 19, 2019
AIMCO PROPERTIES, L.P.
By:AIMCO-GP, Inc., its General Partner
By:/s/ TERRY CONSIDINE    
Terry Considine
Chairman of the Board and
Chief Executive Officer
Date:February 19, 2019
Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of each registrant and in the capacities and on the dates indicated.
SignatureTitleDate
APARTMENT INVESTMENT AND MANAGEMENT COMPANY
AIMCO PROPERTIES, L.P.
By: AIMCO-GP, Inc., its General Partner
/s/ TERRY CONSIDINEChairman of the Board andFebruary 19, 2019
Terry Considine
Chief Executive Officer
(principal executive officer)
/s/ PAUL BELDINExecutive Vice President andFebruary 19, 2019
Paul Beldin
Chief Financial Officer
(principal financial officer)
/s/ THOMAS L. KELTNERDirectorFebruary 19, 2019
Thomas L. Keltner
/s/ J. LANDIS MARTINDirectorFebruary 19, 2019
J. Landis Martin
/s/ ROBERT A. MILLERDirectorFebruary 19, 2019
Robert A. Miller
/s/ KATHLEEN M. NELSONDirectorFebruary 19, 2019
Kathleen M. Nelson
/s/ ANN SPERLINGDirectorFebruary 19, 2019
Ann Sperling
/s/ MICHAEL A. STEINDirectorFebruary 19, 2019
Michael A. Stein
/s/ NINA A. TRANDirectorFebruary 19, 2019
Nina A. Tran

APARTMENT INVESTMENT AND MANAGEMENT COMPANY
AIMCO PROPERTIES, L.P.


INDEX TO FINANCIAL STATEMENTS



Report of Independent Registered Public Accounting Firm


The Shareholders and the Board of Directors
Apartment Investment and Management Company

Opinion on the Financial Statements
We have audited the accompanying consolidated balance sheets of Apartment Investment and Management Company (the Company) as of December 31, 2018 and 2017, the related consolidated statements of operations, comprehensive income, equity, and cash flows for each of the three years in the period ended December 31, 2018, and the related notes and the financial statement schedule listed in the accompanying Index to Financial Statements. Statements (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2018 and 2017, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2018, in conformity with U.S. generally accepted accounting principles.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company’s internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) and our report dated February 19, 2019 expressed an unqualified opinion thereon.
Adoption of New Accounting Standard
As discussed in Note 9 to the consolidated financial statements, the Company changed its accounting for the income tax consequences of intercompany transfers of assets effective January 1, 2017.

Basis for Opinion
These financial statements and schedule are the responsibility of the Company’s management. Our responsibility is to express an opinion on thesethe Company’s financial statements and schedule based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States).PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includesmisstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence supportingregarding the amounts and disclosures in the financial statements. An auditOur audits also includes assessingincluded evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statement presentation.statements. We believe that our audits provide a reasonable basis for our opinion.
In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of the Company at December 31, 2015 and 2014, and the consolidated results of its operations and its cash flows for each of the three years in the period ended December 31, 2015, in conformity with U.S. generally accepted accounting principles. Also, in our opinion, the related financial statement schedule, when considered in relation to the basic financial statements taken as a whole, presents fairly in all material respects the information set forth therein.
As discussed in Note 2 to the consolidated financial statements, the Company changed its method for reporting of discontinued operations effective January 1, 2014.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the Company’s internal control over financial reporting as of December 31, 2015, based on criteria established in Internal Control - Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 Framework) and our report dated February 26, 2016, expressed an unqualified opinion thereon.    
/s/ ERNST & YOUNG LLP

We have served as the Company’s auditor since 1994.
Denver, Colorado
February 26, 201619, 2019


F-2


APARTMENT INVESTMENT AND MANAGEMENT COMPANY
CONSOLIDATED BALANCE SHEETS
As of December 31, 20152018 and 20142017
(In thousands, except share data)

2015 20142018 2017
ASSETS      
Buildings and improvements$6,446,326
 $6,259,318
$6,552,065
 $6,174,149
Land1,861,157
 1,885,640
1,756,525
 1,753,604
Total real estate8,307,483
 8,144,958
8,308,590
 7,927,753
Accumulated depreciation(2,778,022) (2,672,179)(2,585,115) (2,522,358)
Net real estate ($335,129 and $360,160 related to VIEs)5,529,461
 5,472,779
Cash and cash equivalents ($18,852 and $17,108 related to VIEs)50,789
 28,971
Restricted cash ($33,835 and $36,196 related to VIEs)86,956
 91,445
Other assets ($168,519 and $182,108 related to VIEs)473,918
 476,727
Net real estate5,723,475
 5,405,395
Cash and cash equivalents36,858
 60,498
Restricted cash35,737
 34,827
Other assets351,541
 272,739
Assets held for sale3,070
 27,106
42,393
 17,959
Assets of partnerships served by Asset Management business:   
Real estate, net
 224,873
Cash and cash equivalents
 16,288
Restricted cash
 30,928
Other assets
 15,533
Total assets$6,144,194
 $6,097,028
$6,190,004
 $6,079,040
   
LIABILITIES AND EQUITY      
Non-recourse property debt ($325,203 and $336,471 related to VIEs)$3,846,160
 $4,022,809
Non-recourse property debt secured by Real Estate communities, net$3,915,305
 $3,545,109
Term loan, net
 249,501
Revolving credit facility borrowings27,000
 112,330
160,360
 67,160
Total indebtedness3,873,160
 4,135,139
Accounts payable36,123
 41,919
Accrued liabilities and other ($173,689 and $135,644 related to VIEs)318,975
 279,077
Deferred income64,052
 81,882
Total indebtedness associated with Real Estate portfolio4,075,665
 3,861,770
Accrued liabilities and other226,230
 213,027
Liabilities related to assets held for sale53
 28,969
23,177
 
Liabilities of partnerships served by Asset Management business:   
Non-recourse property debt, net
 227,141
Accrued liabilities and other
 19,812
Total liabilities4,292,363
 4,566,986
4,325,072
 4,321,750
Preferred noncontrolling interests in Aimco Operating Partnership87,926
 87,937
Commitments and contingencies (Note 7)
 
Preferred noncontrolling interests in Aimco Operating Partnership (Note 7)101,291
 101,537
Commitments and contingencies (Note 5)
 
Equity:      
Perpetual Preferred Stock (Note 9)159,126
 186,126
Common Stock, $0.01 par value, 500,787,260 shares authorized, 156,326,416 and 146,403,274 shares issued/outstanding at December 31, 2015 and 2014, respectively1,563
 1,464
Perpetual Preferred Stock (Note 6)125,000
 125,000
Common Stock, $0.01 par value, 500,787,260 shares authorized, 149,133,826 and 157,189,447 shares issued/outstanding at December 31, 2018 and 2017, respectively1,491
 1,572
Additional paid-in capital4,064,659
 3,696,143
3,515,641
 3,900,042
Accumulated other comprehensive loss(6,040) (6,456)
Accumulated other comprehensive income4,794
 3,603
Distributions in excess of earnings(2,596,917) (2,649,542)(1,947,507) (2,367,073)
Total Aimco equity1,622,391
 1,227,735
1,699,419
 1,663,144
Noncontrolling interests in consolidated real estate partnerships151,365
 233,296
(2,967) (1,716)
Common noncontrolling interests in Aimco Operating Partnership(9,851) (18,926)67,189
 (5,675)
Total equity1,763,905
 1,442,105
1,763,641
 1,655,753
Total liabilities and equity$6,144,194
 $6,097,028
$6,190,004
 $6,079,040



See notes to the consolidated financial statements.

APARTMENT INVESTMENT AND MANAGEMENT COMPANY
CONSOLIDATED STATEMENTS OF OPERATIONS
For the Years Ended December 31, 2018, 2017 and 2016
(In thousands, except per share data)

 2018 2017 2016
REVENUES:     
Rental and other property revenues attributable to Real Estate$922,593
 $918,148
 $899,891
Rental and other property revenues of partnerships served by Asset Management business42,830
 74,046
 74,640
Tax credit and transaction revenues6,987
 13,243
 21,323
Total revenues972,410
 1,005,437
 995,854
OPERATING EXPENSES:     
Property operating expenses attributable to Real Estate307,901
 319,126
 317,957
Property operating expenses of partnerships served by Asset Management business20,921
 35,458
 36,956
Depreciation and amortization377,786
 366,184
 333,066
General and administrative expenses46,268
 43,657
 46,784
Other expenses, net3,778
 11,148
 14,295
Provision for real estate impairment loss
 35,881
 
Total operating expenses756,654
 811,454
 749,058
      
Interest income10,914
 8,332
 7,797
Interest expense(200,634) (194,615) (196,389)
Gain on dispositions of real estate and the Asset Management Business677,463
 300,849
 400,156
Other, net77
 7,694
 6,071
Income before income tax benefit703,576
 316,243
 464,431
Income tax benefit (Note 9)13,027
 30,836
 18,842
Net income716,603
 347,079
 483,273
Noncontrolling interests:     
Net income attributable to noncontrolling interests in consolidated real estate partnerships(8,220) (9,084) (25,256)
Net income attributable to preferred noncontrolling interests in Aimco Operating Partnership(7,739) (7,764) (7,239)
Net income attributable to common noncontrolling interests in Aimco Operating Partnership(34,417) (14,457) (20,368)
Net income attributable to noncontrolling interests(50,376) (31,305) (52,863)
Net income attributable to Aimco666,227
 315,774
 430,410
Net income attributable to Aimco preferred stockholders(8,593) (8,594) (11,994)
Net income attributable to participating securities(1,037) (319) (635)
Net income attributable to Aimco common stockholders$656,597
 $306,861
 $417,781
      
Net income attributable to Aimco per common share – basic$4.21
 $1.96
 $2.68
Net income attributable to Aimco per common share – diluted$4.21
 $1.96
 $2.67
      
Weighted average common shares outstanding – basic155,866
 156,323
 156,001
Weighted average common shares outstanding – diluted156,053
 156,796
 156,391






See notes to the consolidated financial statements.

F-3


APARTMENT INVESTMENT AND MANAGEMENT COMPANY
CONSOLIDATED STATEMENTS OF OPERATIONS
For the Years Ended December 31, 2015, 2014 and 2013
(In thousands, except per share data)

 2015 2014 2013
REVENUES:     
Rental and other property revenues$956,954
 $952,831
 $939,231
Tax credit and asset management revenues24,356
 31,532
 34,822
Total revenues981,310
 984,363
 974,053
OPERATING EXPENSES:     
Property operating expenses359,393
 373,654
 375,710
Investment management expenses5,855
 7,310
 4,341
Depreciation and amortization306,301
 282,608
 291,910
Provision for real estate impairment losses
 1,820
 
General and administrative expenses43,178
 44,092
 45,670
Other expenses, net10,368
 12,529
 7,403
Total operating expenses725,095
 722,013
 725,034
Operating income256,215
 262,350
 249,019
Interest income6,949
 6,878
 17,943
Interest expense(199,685) (220,971) (237,048)
Other, net387
 (829) 2,723
Income before income taxes and discontinued operations63,866
 47,428
 32,637
Income tax benefit27,524
 20,047
 1,959
Income from continuing operations91,390
 67,475
 34,596
Income from discontinued operations, net of tax (Note 12)
 
 203,229
Gain on dispositions of real estate, net of tax (Note 12)180,593
 288,636
 
Net income271,983
 356,111
 237,825
Noncontrolling interests:     
Net income attributable to noncontrolling interests in consolidated real estate partnerships(4,776) (24,595) (12,473)
Net income attributable to preferred noncontrolling interests in Aimco Operating Partnership(6,943) (6,497) (6,423)
Net income attributable to common noncontrolling interests in Aimco Operating Partnership(11,554) (15,770) (11,639)
Net income attributable to noncontrolling interests(23,273) (46,862) (30,535)
Net income attributable to Aimco248,710
 309,249
 207,290
Net income attributable to Aimco preferred stockholders(11,794) (7,947) (2,804)
Net income attributable to participating securities(950) (1,082) (813)
Net income attributable to Aimco common stockholders$235,966
 $300,220
 $203,673
Earnings attributable to Aimco per common share – basic and diluted:     
Income from continuing operations$1.52
 $2.06
 $0.29
Income from discontinued operations
 
 1.11
Net income$1.52
 $2.06
 $1.40
Weighted average common shares outstanding – basic155,177
 145,639
 145,291
Weighted average common shares outstanding – diluted155,570
 146,002
 145,532





See notes to the consolidated financial statements.

F-4


APARTMENT INVESTMENT AND MANAGEMENT COMPANY
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
For the Years Ended December 31, 2015, 20142018, 2017 and 20132016
(In thousands)

 2015 2014 2013
      
Net income$271,983
 $356,111
 $237,825
Other comprehensive income (loss):     
Unrealized (losses) gains on interest rate swaps(1,299) (2,306) 1,734
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss1,678
 1,685
 1,678
Unrealized gains (losses) on debt securities classified as available-for-sale214
 (1,192) (4,188)
Other comprehensive income (loss)593
 (1,813) (776)
Comprehensive income272,576
 354,298
 237,049
Comprehensive income attributable to noncontrolling interests(23,450) (46,903) (30,819)
Comprehensive income attributable to Aimco$249,126
 $307,395
 $206,230
 2018 2017 2016
Net income$716,603
 $347,079
 $483,273
Other comprehensive gain:     
Realized and unrealized (losses) gains on interest rate swaps
 (173) 221
Losses on interest rate swaps reclassified into earnings from accumulated other comprehensive loss1,391
 1,480
 1,586
Unrealized (losses) gains on available for sale debt securities(131) 1,507
 5,855
Other comprehensive gain1,260
 2,814
 7,662
Comprehensive income717,863
 349,893
 490,935
Comprehensive income attributable to noncontrolling interests(50,445) (31,527) (53,474)
Comprehensive income attributable to Aimco$667,418
 $318,366
 $437,461






































See notes to the consolidated financial statements.

F-5


APARTMENT INVESTMENT AND MANAGEMENT COMPANY
CONSOLIDATED STATEMENTS OF EQUITY
For the Years Ended December 31, 2015, 20142018, 2017 and 20132016
(In thousands)
 Preferred Stock Common Stock            Preferred Stock Common Stock            
 Shares Issued Amount Shares Issued Amount Additional Paid-in Capital Accumulated Other Comprehensive Loss Distributions in Excess of Earnings Total Aimco Equity Noncontrolling Interests Total EquityShares Issued Amount Shares Issued Amount Additional Paid-in Capital Accumulated Other Comprehensive Income (Loss) Distributions in Excess of Earnings Total Aimco Equity Noncontrolling Interests Total Equity
Balances at December 31, 2012 1,274
 $68,114
 145,564
 $1,456
 $3,712,684
 $(3,542) $(2,863,287) $915,425
 $239,469
 $1,154,894
Balances at December 31, 20156,391
 $159,126
 156,326
 $1,563
 $4,064,659
 $(6,040) $(2,596,917) $1,622,391
 $141,514
 $1,763,905
Redemption of Preferred Stock(1,391) (34,126) 
 
 1,307
 
 (1,980) (34,799) 
 (34,799)
Redemption of Aimco Operating Partnership units 
 
 
 
 
 
 
 
 (3,085) (3,085)
 
 
 
 
 
 
 
 (10,819) (10,819)
Amortization of share-based compensation cost 
 
 33
 
 5,915
 
 
 5,915
 
 5,915

 
 31
 
 8,610
 
 
 8,610
 
 8,610
Exercises of stock options 
 
 44
 
 993
 
 
 993
 
 993
Contributions from noncontrolling interests 
 
 
 
 
 
 
 
 1,630
 1,630
Effect of changes in ownership for consolidated entities 
 
 
 
 (19,805) 
 
 (19,805) 2,130
 (17,675)
 
 
 
 (26,171) 
 
 (26,171) 10,107
 (16,064)
Change in accumulated other comprehensive loss 
 
 
 
 
 (1,060) 
 (1,060) 284
 (776)
Change in accumulated other comprehensive income
 
 
 
 
 7,051
 
 7,051
 611
 7,662
Other, net 
 
 276
 3
 1,552
 
 
 1,555
 693
 2,248

 
 531
 6
 3,317
 
 
 3,323
 
 3,323
Net income 
 
 
 
 
 
 207,290
 207,290
 24,112
 231,402

 
 
 
 
 
 430,410
 430,410
 45,624
 476,034
Distributions to noncontrolling interests 
 
 
 
 
 
 
 
 (59,946) (59,946)
 
 
 
 
 
 
 
 (35,974) (35,974)
Common Stock dividends 
 
 
 
 
 
 (140,052) (140,052) 
 (140,052)
 
 
 
 
 
 (206,898) (206,898) 
 (206,898)
Preferred Stock dividends 
 
 
 
 
 
 (2,804) (2,804) 
 (2,804)
 
 
 
 
 
 (10,014) (10,014) 
 (10,014)
Balances at December 31, 2013 1,274
 68,114
 145,917
 1,459
 3,701,339
 (4,602) (2,798,853) 967,457
 205,287
 1,172,744
Issuance of Preferred Stock 5,117
 128,012
 
 
 (4,460) 
 
 123,552
 
 123,552
Repurchase of Preferred Stock 
 (10,000) 
 
 257
 
 227
 (9,516) 
 (9,516)
Balances at December 31, 20165,000
 125,000
 156,888
 1,569
 4,051,722
 1,011
 (2,385,399) 1,793,903
 151,063
 1,944,966
Redemption of Aimco Operating Partnership units 
 
 
 
 
 
 
 
 (7,756) (7,756)
 
 
 
 
 
 
 
 (11,882) (11,882)
Amortization of share-based compensation cost 
 
 33
 
 6,139
 
 
 6,139
 
 6,139

 
 18
 
 8,638
 
 
 8,638
 613
 9,251
Exercises of stock options 
 
 303
 3
 765
 
 
 768
 
 768
Contributions from noncontrolling interests 
 
 
 
 
 
 
 
 11,559
 11,559

 
 
 
 
 
 
 
 3,401
 3,401
Effect of changes in ownership for consolidated entities 
 
 
 
 (8,097) 
 
 (8,097) 8,809
 712

 
 
 
 (160,586) 
 
 (160,586) (152,189) (312,775)
Change in accumulated other comprehensive loss 
 
 
 
 
 (1,854) 
 (1,854) 41
 (1,813)
Cumulative effect of a change in accounting principle
 
 
 
 
 
 (62,682) (62,682) (3,028) (65,710)
Change in accumulated other comprehensive income
 
 
 
 
 2,592
 
 2,592
 222
 2,814
Other, net 
 
 150
 2
 200
 
 
 202
 (21) 181

 
 283
 3
 268
 
 
 271
 
 271
Net income 
 
 
 
 
 
 309,249
 309,249
 40,365
 349,614

 
 
 
 
 
 315,774
 315,774
 23,541
 339,315
Distributions to noncontrolling interests 
 
 
 
 
 
 
 
 (43,914) (43,914)
 
 
 
 
 
 
 
 (19,132) (19,132)
Common Stock dividends 
 
 
 
 
 
 (151,991) (151,991) 
 (151,991)
 
 
 
 
 
 (226,172) (226,172) 
 (226,172)
Preferred Stock dividends 
 
 
 
 
 
 (8,174) (8,174) 
 (8,174)
 
 
 
 
 
 (8,594) (8,594) 
 (8,594)
Balances at December 31, 2014 6,391
 186,126
 146,403
 1,464
 3,696,143
 (6,456) (2,649,542) 1,227,735
 214,370
 1,442,105
Issuance of Common Stock 
 
 9,430
 94
 366,486
 
 
 366,580
 
 366,580
Repurchase of Preferred Stock 
 (27,000) 
 
 695
 
 (695) (27,000) 
 (27,000)
Balances at December 31, 20175,000
 125,000
 157,189
 1,572
 3,900,042
 3,603
 (2,367,073) 1,663,144
 (7,391) 1,655,753
Repurchases of Common Stock
 
 (8,219) (82) (373,511) 
 
 (373,593) 
 (373,593)
Issuance of Aimco Operating Partnership units
 
 
 
 
 
 
 
 50,151
 50,151
Redemption of Aimco Operating Partnership units 
 
 
 
 
 
 
 
 (4,181) (4,181)
 
 
 
 
 
 
 
 (9,639) (9,639)
Amortization of share-based compensation cost 
 
 27
 
 7,096
 
 
 7,096
 
 7,096

 
 22
 
 8,074
 
 
 8,074
 1,691
 9,765
Exercises of stock options 
 
 144
 2
 265
 
 
 267
 
 267
Effect of changes in ownership for consolidated entities 
 
 
 
 (6,008) 
 
 (6,008) 4,189
 (1,819)
 
 
 
 (19,115) 
 
 (19,115) 9,014
 (10,101)
Change in accumulated other comprehensive loss 
 
 
 
 
 416
 
 416
 177
 593
Change in accumulated other comprehensive income
 
 
 
 
 1,191
 
 1,191
 69
 1,260
Other, net 
 
 322
 3
 (18) 
 100
 85
 
 85

 
 142
 1
 151
 
 
 152
 
 152
Net income 
 
 
 
 
 
 248,710
 248,710
 16,330
 265,040

 
 
 
 
 
 666,227
 666,227
 42,637
 708,864
Distributions to noncontrolling interests 
 
 
 
 
 
 
 
 (89,371) (89,371)
 
 
 
 
 
 
 
 (22,310) (22,310)
Common Stock dividends 
 
 
 
 
 
 (184,391) (184,391) 
 (184,391)
 
 
 
 
 
 (238,067) (238,067) 
 (238,067)
Preferred Stock dividends 
 
 
 
 
 
 (11,099) (11,099) 
 (11,099)
 
 
 
 
 
 (8,594) (8,594) 
 (8,594)
Balances at December 31, 2015 6,391
 $159,126
 156,326
 $1,563
 $4,064,659
 $(6,040) $(2,596,917) $1,622,391
 $141,514
 $1,763,905
Balances at December 31, 20185,000
 $125,000
 149,134
 $1,491
 $3,515,641
 $4,794
 $(1,947,507) $1,699,419
 $64,222
 $1,763,641




See notes to the consolidated financial statements.

APARTMENT INVESTMENT AND MANAGEMENT COMPANY
CONSOLIDATED STATEMENTS OF CASH FLOWS
For the Years Ended December 31, 2018, 2017 and 2016
(In thousands)
F-6

 2018 2017 2016
CASH FLOWS FROM OPERATING ACTIVITIES:     
Net income$716,603
 $347,079
 $483,273
Adjustments to reconcile net income to net cash provided by operating activities:     
Depreciation and amortization377,786
 366,184
 333,066
Provision for real estate impairment loss
 35,881
 
Gain on dispositions of real estate and the Asset Management business(677,463) (300,849) (400,156)
Income tax benefit(13,027) (30,836) (18,842)
Share-based compensation expense8,550
 7,877
 7,629
Amortization of debt issue costs and other9,023
 5,666
 5,060
Other, net1,065
 (7,694) (6,071)
Changes in operating assets and operating liabilities:     
Accounts receivable and other assets(27,830) (15,841) (22,294)
Accounts payable, accrued liabilities and other1,681
 (15,395) (5,164)
Total adjustments(320,215) 44,993
 (106,772)
Net cash provided by operating activities396,388
 392,072
 376,501
CASH FLOWS FROM INVESTING ACTIVITIES:     
Purchases of real estate and deposits related to purchases of real estate(242,297) (20,372) (290,729)
Capital expenditures(340,489) (358,104) (346,645)
Proceeds from dispositions of real estate708,848
 401,983
 535,513
Purchases of corporate assets(7,718) (8,899) (7,540)
Proceeds from repayments on notes receivable5,010
 430
 412
Other investing activities(1,508) (2,019) 9,842
Net cash provided by (used in) investing activities121,846
 13,019
 (99,147)
CASH FLOWS FROM FINANCING ACTIVITIES:     
Proceeds from non-recourse property debt1,228,027
 312,434
 417,714
Principal repayments on non-recourse property debt(976,087) (409,167) (371,947)
(Repayment of) proceeds from term loan(250,000) 250,000
 
Net borrowings on (repayments of) revolving credit facility93,200
 49,230
 (9,070)
Payment of debt issue costs(11,961) (4,751) (7,816)
Payment of debt extinguishment costs(14,241) (399) (391)
Repurchases of Common Stock(373,593) 
 
Redemptions of Preferred Stock
 
 (34,799)
Payment of dividends to holders of Preferred Stock(8,594) (8,594) (10,014)
Payment of dividends to holders of Common Stock(237,504) (225,377) (206,279)
Payment of distributions to noncontrolling interests(29,196) (26,799) (35,706)
Redemptions of noncontrolling interests in the Aimco Operating Partnership(9,885) (13,546) (12,544)
Purchases of noncontrolling interests in consolidated real estate partnerships(3,579) (314,269) (13,941)
Other financing activities5,233
 (2,462) 844
Net cash used in financing activities(588,180) (393,700) (283,949)
NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH(69,946) 11,391
 (6,595)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD142,541
 131,150
 137,745
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD$72,595
 $142,541
 $131,150



See notes to the consolidated financial statements.

APARTMENT INVESTMENT AND MANAGEMENT COMPANY
CONSOLIDATED STATEMENTS OF CASH FLOWS
For the Years Ended December 31, 2015, 20142018, 2017 and 2013
(In thousands)
 2015 2014 2013
CASH FLOWS FROM OPERATING ACTIVITIES:     
Net income$271,983
 $356,111
 $237,825
Adjustments to reconcile net income to net cash provided by operating activities:     
Depreciation and amortization306,301
 282,608
 291,910
Provision for real estate impairment losses
 1,820
 
Other, net(387) 829
 (2,723)
Gain on dispositions of real estate, net of tax(180,593) (288,636) 
Income tax benefit(27,524) (20,047) (1,959)
Share-based compensation expense6,640
 5,781
 5,645
Amortization of deferred loan costs and other5,186
 3,814
 4,915
Adjustments to net income from discontinued operations
 
 (186,068)
Changes in operating assets and operating liabilities:     
Accounts receivable and other assets619
 9,039
 4,592
Accounts payable, accrued liabilities and other(22,334) (29,895) (28,541)
Total adjustments87,908
 (34,687) 87,771
Net cash provided by operating activities359,891
 321,424
 325,596
CASH FLOWS FROM INVESTING ACTIVITIES:     
Purchases of real estate and deposits related to purchases of real estate(169,447) (284,041) (51,291)
Capital expenditures(367,180) (367,324) (350,338)
Proceeds from dispositions of real estate367,571
 640,044
 357,314
Purchases of corporate assets(6,665) (8,479) (10,863)
Purchase of property loans
 
 (119,101)
Proceeds from repayment of property loans and option value
 
 215,517
Changes in restricted cash(429) 26,315
 3,003
Other investing activities5,253
 7,163
 20,951
Net cash (used in) provided by investing activities(170,897) 13,678
 65,192
CASH FLOWS FROM FINANCING ACTIVITIES:     
Proceeds from non-recourse property debt352,602
 188,503
 232,965
Principal repayments on non-recourse property debt(514,294) (513,599) (472,276)
Net (repayments) borrowings on revolving credit facility(85,330) 61,930
 50,400
Proceeds from issuance of Common Stock366,580
 
 
Proceeds from issuance of Preferred Stock
 123,551
 
Redemptions and repurchases of Preferred Stock(27,000) (9,516) 
Proceeds from Common Stock option exercises
 768
 993
Payment of dividends to holders of Preferred Stock(11,099) (7,073) (2,804)
Payment of dividends to holders of Common Stock(184,082) (152,002) (140,052)
Payment of distributions to noncontrolling interests(57,401) (49,972) (63,766)
Purchases of noncontrolling interests in consolidated real estate partnerships
 
 (16,775)
Other financing activities(7,152) (4,472) (8,135)
Net cash used in financing activities(167,176) (361,882) (419,450)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS21,818
 (26,780) (28,662)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD28,971
 55,751
 84,413
CASH AND CASH EQUIVALENTS AT END OF PERIOD$50,789
 $28,971
 $55,751









See notes to the consolidated financial statements.

F-7


APARTMENT INVESTMENT AND MANAGEMENT COMPANY
CONSOLIDATED STATEMENTS OF CASH FLOWS
For the Years Ended December 31, 2015, 2014 and 20132016
(In thousands)

2015 2014 20132018 2017 2016
SUPPLEMENTAL CASH FLOW INFORMATION:          
Interest paid$207,087
 $231,887
 $273,635
$199,996
 $196,438
 $200,278
Cash paid for income taxes2,033
 1,657
 629
11,522
 7,401
 2,152
Non-cash transactions associated with the acquisition or disposition of real estate:          
Non-recourse property debt assumed in connection with our acquisition of real estate
 65,200
 14,767
Non-recourse property debt assumed by buyer in connection with our disposition of real estate6,068
 58,410
 126,663
Non-recourse, subordinate debt of the disposed legacy asset management business forgiven in connection with the disposition of real estate
 
 8,149
Non-recourse property debt assumed by buyer in connection with the disposition of the Asset Management business227,708
 
 
Non-recourse property debt assumed in connection with the acquisition of real estate208,885
 
 
Issuance of preferred OP Units in connection with acquisition of real estate
 9,117
 

 
 17,000
Issuance of common OP Units in connection with acquisition of real estate50,151
 
 
Other non-cash investing and financing transactions:          
Issuance of common OP Units for acquisition of noncontrolling interests in consolidated real estate partnerships
 
 416
Accrued capital expenditures43,725
 45,701
 45,571
Accrued dividends on TSR restricted stock (Note 11)309
 
 
Accrued capital expenditures (at end of period)40,185
 31,719
 35,594
Accrued dividends on TSR restricted stock and LTIP awards (at end of period) (Note 8)1,266
 1,720
 927




































See notes to the consolidated financial statements.

F-8



REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRMReport of Independent Registered Public Accounting Firm


The Partners and the Board of Directors
AIMCO Properties, L.P.
 
Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of AIMCO Properties, L.P. (the “Partnership”) as of December 31, 20152018 and 2014, and2017, the related consolidated statements of operations, comprehensive income, partners’ capital, and cash flows for each of the three years in the period ended December 31, 2015. Our audits also included2018, and the related notes and the financial statement schedule listed in the accompanying Index to Financial Statements. Statements (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Partnership at December 31, 2018 and 2017, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2018, in conformity with U.S. generally accepted accounting principles.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Partnership’s internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) and our report dated February 19, 2019 expressed an unqualified opinion thereon.

Adoption of New Accounting Standard
As discussed in Note 9 to the consolidated financial statements, the Partnership changed its accounting for the income tax consequences of intercompany transfers of assets effective January 1, 2017.

Basis for Opinion

These financial statements and schedule are the responsibility of the Partnership’s management. Our responsibility is to express an opinion on thesethe Partnership’s financial statements and schedule based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Partnership in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States).PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includesmisstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence supportingregarding the amounts and disclosures in the financial statements. An auditOur audits also includes assessingincluded evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statement presentation.statements. We believe that our audits provide a reasonable basis for our opinion.
In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of the Partnership at December 31, 2015 and 2014, and the consolidated results of its operations and its cash flows for each of the three years in the period ended December 31, 2015, in conformity with U.S. generally accepted accounting principles. Also, in our opinion, the related financial statement schedule, when considered in relation to the basic financial statements taken as a whole, presents fairly in all material respects the information set forth therein.
As discussed in Note 2 to the consolidated financial statements, the Partnership changed its method for reporting of discontinued operations effective January 1, 2014.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the Partnership’s internal control over financial reporting as of December 31, 2015, based on criteria established in Internal Control - Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 Framework) and our report dated February 26, 2016, expressed an unqualified opinion thereon.    
/s/ ERNST & YOUNG LLP
We have served as the Partnership’s auditor since 1994.

Denver, Colorado
February 26, 201619, 2019





F-9


AIMCO PROPERTIES, L.P.
CONSOLIDATED BALANCE SHEETS
As of December 31, 20152018 and 20142017
(In thousands)

2015 20142018 2017
ASSETS      
Buildings and improvements$6,446,326
 $6,259,318
$6,552,065
 $6,174,149
Land1,861,157
 1,885,640
1,756,525
 1,753,604
Total real estate8,307,483
 8,144,958
8,308,590
 7,927,753
Accumulated depreciation(2,778,022) (2,672,179)(2,585,115) (2,522,358)
Net real estate ($335,129 and $360,160 related to VIEs)5,529,461
 5,472,779
Cash and cash equivalents ($18,852 and $17,108 related to VIEs)50,789
 28,971
Restricted cash ($33,835 and $36,196 related to VIEs)86,956
 91,445
Other assets ($168,519 and $182,108 related to VIEs)473,918
 476,727
Net real estate5,723,475
 5,405,395
Cash and cash equivalents36,858
 60,498
Restricted cash35,737
 34,827
Other assets351,541
 272,739
Assets held for sale3,070
 27,106
42,393
 17,959
Assets of partnerships served by Asset Management business:   
Real estate, net
 224,873
Cash and cash equivalents
 16,288
Restricted cash
 30,928
Other assets
 15,533
Total assets$6,144,194
 $6,097,028
$6,190,004
 $6,079,040
LIABILITIES AND EQUITY   
Non-recourse property debt ($325,203 and $336,471 related to VIEs)$3,846,160
 $4,022,809
   
LIABILITIES AND PARTNERS’ CAPITAL   
Non-recourse property debt secured by Real Estate communities, net$3,915,305
 $3,545,109
Term loan, net
 249,501
Revolving credit facility borrowings27,000
 112,330
160,360
 67,160
Total indebtedness3,873,160
 4,135,139
Accounts payable36,123
 41,919
Accrued liabilities and other ($173,689 and $135,644 related to VIEs)318,975
 279,077
Deferred income64,052
 81,882
Total indebtedness associated with Real Estate portfolio4,075,665
 3,861,770
Accrued liabilities and other226,230
 213,027
Liabilities related to assets held for sale53
 28,969
23,177
 
Liabilities of partnerships served by Asset Management business:   
Non-recourse property debt, net
 227,141
Accrued liabilities and other
 19,812
Total liabilities4,292,363
 4,566,986
4,325,072
 4,321,750
Redeemable preferred units87,926
 87,937
Commitments and contingencies (Note 7)
 
Redeemable preferred units (Note 7)101,291
 101,537
Commitments and contingencies (Note 5)
 
Partners’ Capital:      
Preferred units (Note 10)159,126
 186,126
Preferred units (Note 7)125,000
 125,000
General Partner and Special Limited Partner1,463,265
 1,041,609
1,574,419
 1,538,144
Limited Partners(9,851) (18,926)67,189
 (5,675)
Partners’ capital attributable to the Aimco Operating Partnership1,612,540
 1,208,809
1,766,608
 1,657,469
Noncontrolling interests in consolidated real estate partnerships151,365
 233,296
(2,967) (1,716)
Total partners’ capital1,763,905
 1,442,105
1,763,641
 1,655,753
Total liabilities and partners’ capital$6,144,194
 $6,097,028
$6,190,004
 $6,079,040






See notes to the consolidated financial statements.

AIMCO PROPERTIES, L.P.
CONSOLIDATED STATEMENTS OF OPERATIONS
For the Years Ended December 31, 2018, 2017 and 2016
(In thousands, except per unit data)

 2018 2017 2016
REVENUES:     
Rental and other property revenues attributable to Real Estate$922,593
 $918,148
 $899,891
Rental and other property revenues of partnerships served by Asset Management business42,830
 74,046
 74,640
Tax credit and transaction revenues6,987
 13,243
 21,323
Total revenues972,410
 1,005,437
 995,854
OPERATING EXPENSES:     
Property operating expenses attributable to Real Estate307,901
 319,126
 317,957
Property operating expenses of partnerships served by Asset Management business20,921
 35,458
 36,956
Depreciation and amortization377,786
 366,184
 333,066
General and administrative expenses46,268
 43,657
 46,784
Other expenses, net3,778
 11,148
 14,295
Provision for real estate impairment loss
 35,881
 
Total operating expenses756,654
 811,454
 749,058
      
Interest income10,914
 8,332
 7,797
Interest expense(200,634) (194,615) (196,389)
Gain on dispositions of real estate and the Asset Management Business677,463
 300,849
 400,156
Other, net77
 7,694
 6,071
Income before income tax benefit703,576
 316,243
 464,431
Income tax benefit (Note 9)13,027
 30,836
 18,842
Net income716,603
 347,079
 483,273
Net income attributable to noncontrolling interests in consolidated real estate partnerships(8,220) (9,084) (25,256)
Net income attributable to the Aimco Operating Partnership708,383
 337,995
 458,017
Net income attributable to the Aimco Operating Partnership’s preferred unitholders(16,332) (16,358) (19,233)
Net income attributable to participating securities(1,177) (337) (635)
Net income attributable to the Aimco Operating Partnership’s common unitholders$690,874
 $321,300
 $438,149
      
Net income attributable to the Aimco Operating Partnership per common unit – basic$4.22
 $1.96
 $2.68
Net income attributable to the Aimco Operating Partnership per common unit – diluted$4.21
 $1.96
 $2.67
      
Weighted average common units outstanding – basic163,846
 163,746
 163,761
Weighted average common units outstanding – diluted164,033
 164,218
 164,151










See notes to the consolidated financial statements.

F-10


AIMCO PROPERTIES, L.P.
CONSOLIDATED STATEMENTS OF OPERATIONS
As of December 31, 2015, 2014 and 2013
(In thousands, except per unit data)

 2015 2014 2013
REVENUES:     
Rental and other property revenues$956,954
 $952,831
 $939,231
Tax credit and asset management revenues24,356
 31,532
 34,822
Total revenues981,310
 984,363
 974,053
OPERATING EXPENSES:     
Property operating expenses359,393
 373,654
 375,710
Investment management expenses5,855
 7,310
 4,341
Depreciation and amortization306,301
 282,608
 291,910
Provision for real estate impairment losses
 1,820
 
General and administrative expenses43,178
 44,092
 45,670
Other expenses, net10,368
 12,529
 7,403
Total operating expenses725,095
 722,013
 725,034
Operating income256,215
 262,350
 249,019
Interest income6,949
 6,878
 17,943
Interest expense(199,685) (220,971) (237,048)
Other, net387
 (829) 2,723
Income before income taxes and discontinued operations63,866
 47,428
 32,637
Income tax benefit27,524
 20,047
 1,959
Income from continuing operations91,390
 67,475
 34,596
Income from discontinued operations, net of tax (Note 12)
 
 203,229
Gain on dispositions of real estate, net of tax (Note 12)180,593
 288,636
 
Net income271,983
 356,111
 237,825
Net income attributable to noncontrolling interests in consolidated real estate partnerships(4,776) (24,595) (12,473)
Net income attributable to the Aimco Operating Partnership267,207
 331,516
 225,352
Net income attributable to the Aimco Operating Partnership’s preferred unitholders(18,737) (14,444) (9,227)
Net income attributable to participating securities(950) (1,082) (813)
Net income attributable to the Aimco Operating Partnership’s common unitholders$247,520
 $315,990
 $215,312
Earnings attributable to the Aimco Operating Partnership per common unit – basic and diluted:     
Income from continuing operations$1.52
 $2.06
 $0.29
Income from discontinued operations
 
 1.11
Net income$1.52
 $2.06
 $1.40
Weighted average common units outstanding – basic162,834
 153,363
 153,256
Weighted average common units outstanding – diluted163,227
 153,726
 153,497








See notes to the consolidated financial statements.

F-11


AIMCO PROPERTIES, L.P.
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
For the Years Ended December 31, 2015, 20142018, 2017 and 20132016
(In thousands)

 2015 2014 2013
      
Net income$271,983
 $356,111
 $237,825
Other comprehensive income (loss):     
Unrealized (losses) gains on interest rate swaps(1,299) (2,306) 1,734
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss1,678
 1,685
 1,678
Unrealized gains (losses) on debt securities classified as available-for-sale214
 (1,192) (4,188)
Other comprehensive income (loss)593
 (1,813) (776)
Comprehensive income272,576
 354,298
 237,049
Comprehensive income attributable to noncontrolling interests(4,932) (24,733) (12,815)
Comprehensive income attributable to the Aimco Operating Partnership$267,644
 $329,565
 $224,234
 2018 2017 2016
Net income$716,603
 $347,079
 $483,273
Other comprehensive gain:     
Realized and unrealized (losses) gains on interest rate swaps
 (173) 221
Losses on interest rate swaps reclassified into earnings from accumulated other comprehensive loss1,391
 1,480
 1,586
Unrealized (losses) gains on available for sale debt securities(131) 1,507
 5,855
Other comprehensive gain1,260
 2,814
 7,662
Comprehensive income717,863
 349,893
 490,935
Comprehensive income attributable to noncontrolling interests(8,220) (9,185) (25,516)
Comprehensive income attributable to the Aimco Operating Partnership$709,643
 $340,708
 $465,419






































See notes to the consolidated financial statements.

F-12


AIMCO PROPERTIES, L.P.
CONSOLIDATED STATEMENTS OF PARTNERS’ CAPITAL
For the Years Ended December 31, 2015, 20142018, 2017 and 20132016
(In thousands)
 
Preferred
Units
 
General Partner
and Special
Limited Partner
 Limited Partners Partners’ Capital Attributable to the Partnership Non - controlling Interests Total
Partners’ Capital
 
Balances at December 31, 2012$68,114
 $847,311
 $(31,596) $883,829
 $271,065
 $1,154,894
 
Redemption of partnership units held by non-Aimco partners
 
 (3,085) (3,085) 
 (3,085) 
Amortization of Aimco share-based compensation
 5,915
 
 5,915
 
 5,915
 
Issuance of common partnership units to Aimco in connection with exercise of Aimco stock options
 993
 
 993
 
 993
 
Contributions from noncontrolling interests
 
 
 
 1,630
 1,630
 
Effect of changes in ownership for consolidated entities
 (19,805) 2,635
 (17,170) (505) (17,675) 
Change in accumulated other comprehensive loss
 (1,060) (58) (1,118) 342
 (776) 
Other, net
 1,555
 386
 1,941
 307
 2,248
 
Net income
 207,290
 11,639
 218,929
 12,473
 231,402
 
Distributions to noncontrolling interests
 
 
 
 (52,304) (52,304) 
Distributions to common unitholders
 (140,052) (7,642) (147,694) 
 (147,694) 
Distributions to preferred unitholders
 (2,804) 
 (2,804) 
 (2,804) 
Balances at December 31, 201368,114
 899,343
 (27,721) 939,736
 233,008
 1,172,744
 
Issuance of preferred units to Aimco128,012
 (4,460) 
 123,552
 
 123,552
 
Repurchase of preferred units held by Aimco(10,000) 484
 
 (9,516) 
 (9,516) 
Redemption of partnership units held by non-Aimco partners
 
 (7,756) (7,756) 
 (7,756) 
Amortization of Aimco share-based compensation
 6,139
 
 6,139
 
 6,139
 
Issuance of common partnership units to Aimco in connection with exercise of Aimco stock options
 768
 
 768
 
 768
 
Contributions from noncontrolling interests
 
 
 
 11,559
 11,559
 
Effect of changes in ownership for consolidated entities
 (8,097) 8,888
 791
 (79) 712
 
Change in accumulated other comprehensive loss
 (1,854) (97) (1,951) 138
 (1,813) 
Other, net
 202
 
 202
 (21) 181
 
Net income
 309,249
 15,770
 325,019
 24,595
 349,614
 
Distributions to noncontrolling interests
 
 
 
 (35,904) (35,904) 
Distributions to common unitholders
 (151,991) (8,010) (160,001) 
 (160,001) 
Distributions to preferred unitholders
 (8,174) 
 (8,174) 
 (8,174) 
Balances at December 31, 2014186,126
 1,041,609
 (18,926) 1,208,809
 233,296
 1,442,105
 
Issuance of common partnership units to Aimco
 366,580
 
 366,580
 
 366,580
 
Repurchase of preferred units held by Aimco(27,000) 
 
 (27,000) 
 (27,000) 
Redemption of partnership units held by non-Aimco partners
 
 (4,181) (4,181) 
 (4,181) 
Amortization of Aimco share-based compensation
 7,096
 
 7,096
 
 7,096
 
Issuance of common partnership units to Aimco in connection with exercise of Aimco stock options
 267
 
 267
 
 267
 
Effect of changes in ownership for consolidated entities
 (6,008) 10,739
 4,731
 (6,550) (1,819) 
Change in accumulated other comprehensive loss
 416
 21
 437
 156
 593
 
Other, net
 85
 
 85
 

 85
 
Net income
 248,710
 11,554
 260,264
 4,776
 265,040
 
Distributions to noncontrolling interests
 
 
 
 (80,313) (80,313) 
Distributions to common unitholders
 (184,391) (9,058) (193,449) 
 (193,449) 
Distributions to preferred unitholders
 (11,099) 
 (11,099) 
 (11,099) 
Balances at December 31, 2015$159,126
 $1,463,265
 $(9,851) $1,612,540
 $151,365
 $1,763,905
 



See notes to the consolidated financial statements.

F-13


AIMCO PROPERTIES, L.P.
CONSOLIDATED STATEMENTS OF CASH FLOWS
For the Years Ended December 31, 2015, 2014 and 2013
(In thousands)
 2015 2014 2013
CASH FLOWS FROM OPERATING ACTIVITIES:     
Net income$271,983
 $356,111
 $237,825
Adjustments to reconcile net income to net cash provided by operating activities:     
Depreciation and amortization306,301
 282,608
 291,910
Provision for real estate impairment losses
 1,820
 
Other, net(387) 829
 (2,723)
Gain on dispositions of real estate, net of tax(180,593) (288,636) 
Income tax benefit(27,524) (20,047) (1,959)
Share-based compensation expense6,640
 5,781
 5,645
Amortization of deferred loan costs and other5,186
 3,814
 4,915
Adjustments to net income from discontinued operations
 
 (186,068)
Changes in operating assets and operating liabilities:     
Accounts receivable and other assets619
 9,039
 4,592
Accounts payable, accrued liabilities and other(22,334) (29,895) (28,541)
Total adjustments87,908
 (34,687) 87,771
Net cash provided by operating activities359,891
 321,424
 325,596
CASH FLOWS FROM INVESTING ACTIVITIES:     
Purchases of real estate and deposits related to purchases of real estate(169,447) (284,041) (51,291)
Capital expenditures(367,180) (367,324) (350,338)
Proceeds from dispositions of real estate367,571
 640,044
 357,314
Purchases of corporate assets(6,665) (8,479) (10,863)
Purchase of property loans
 
 (119,101)
Proceeds from repayment of property loans and option value
 
 215,517
Changes in restricted cash(429) 26,315
 3,003
Other investing activities5,253
 7,163
 20,951
Net cash (used in) provided by investing activities(170,897) 13,678
 65,192
CASH FLOWS FROM FINANCING ACTIVITIES:     
Proceeds from non-recourse property debt352,602
 188,503
 232,965
Principal repayments on non-recourse property debt(514,294) (513,599) (472,276)
Net (repayments) borrowings on revolving credit facility(85,330) 61,930
 50,400
Proceeds from issuance of common partnership units to Aimco366,580
 
 
Proceeds from issuance of preferred partnership units to Aimco
 123,551
 
Redemption and repurchase of preferred partnership units from Aimco(27,000) (9,516) 
Proceeds from Aimco Common Stock option exercises
 768
 993
Payment of distributions to preferred units(18,042) (13,482) (9,227)
Payment of distributions to General Partner and Special Limited Partner(184,082) (152,002) (140,052)
Payment of distributions to Limited Partners(6,701) (8,008) (7,642)
Payment of distributions to noncontrolling interests(43,757) (35,555) (49,701)
Purchases of noncontrolling interests in consolidated real estate partnerships
 
 (16,775)
Other financing activities(7,152) (4,472) (8,135)
Net cash used in financing activities(167,176) (361,882) (419,450)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS21,818
 (26,780) (28,662)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD28,971
 55,751
 84,413
CASH AND CASH EQUIVALENTS AT END OF PERIOD$50,789
 $28,971
 $55,751



 
Preferred
Units
 
General Partner
and Special
Limited Partner
 Limited Partners Partners’ Capital Attributable to the Partnership Noncontrolling Interests Total
Partners’ Capital
Balances at December 31, 2015$159,126
 $1,463,265
 $(9,851) $1,612,540
 $151,365
 $1,763,905
Redemption of preferred units held by Aimco(34,126) (673) 
 (34,799) 
 (34,799)
Redemption of partnership units held by non-Aimco partners
 
 (10,819) (10,819) 
 (10,819)
Amortization of Aimco share-based compensation
 8,610
 
 8,610
 
 8,610
Effect of changes in ownership for consolidated entities
 (26,171) 10,107
 (16,064) 
 (16,064)
Change in accumulated other comprehensive income
 7,051
 351
 7,402
 260
 7,662
Other, net
 3,323
 
 3,323
 
 3,323
Net income
 430,410
 20,368
 450,778
 25,256
 476,034
Distributions to noncontrolling interests
 
 
 
 (25,760) (25,760)
Distributions to common unitholders
 (206,898) (10,214) (217,112) 
 (217,112)
Distributions to preferred unitholders
 (10,014) 
 (10,014) 
 (10,014)
Balances at December 31, 2016125,000
 1,668,903
 (58) 1,793,845
 151,121
 1,944,966
Redemption of partnership units held by non-Aimco partners
 
 (11,882) (11,882) 
 (11,882)
Amortization of Aimco share-based compensation
 8,638
 613
 9,251
 
 9,251
Contributions from noncontrolling interests
 
 
 
 3,401
 3,401
Effect of changes in ownership for consolidated entities
 (160,586) 4,867
 (155,719) (157,056) (312,775)
Cumulative effect of a change in accounting principle
 (62,682) (3,028) (65,710) 
 (65,710)
Change in accumulated other comprehensive income
 2,592
 121
 2,713
 101
 2,814
Other, net
 271
 
 271
 
 271
Net income
 315,774
 14,457
 330,231
 9,084
 339,315
Distributions to noncontrolling interests
 
 
 
 (8,367) (8,367)
Distributions to common unitholders
 (226,172) (10,765) (236,937) 
 (236,937)
Distributions to preferred unitholders
 (8,594) 
 (8,594) 
 (8,594)
Balances at December 31, 2017125,000
 1,538,144
 (5,675) 1,657,469
 (1,716) 1,655,753
Repurchases of common partnership units
 (373,593) 
 (373,593) 
 (373,593)
Issuance of common partnership units
 
 50,151
 50,151
 
 50,151
Redemption of partnership units held by non-Aimco partners
 
 (9,639) (9,639) 
 (9,639)
Amortization of Aimco share-based compensation
 8,074
 1,691
 9,765
 
 9,765
Effect of changes in ownership for consolidated entities
 (19,115) 9,014
 (10,101) 
 (10,101)
Change in accumulated other comprehensive income
 1,191
 69
 1,260
 
 1,260
Other, net
 152
 
 152
 
 152
Net income
 666,227
 34,417
 700,644
 8,220
 708,864
Distributions to noncontrolling interests
 
 (12,839) (12,839) (9,471) (22,310)
Distributions to common unitholders
 (238,067) 
 (238,067) 
 (238,067)
Distributions to preferred unitholders
 (8,594) 
 (8,594) 
 (8,594)
Balances at December 31, 2018$125,000
 $1,574,419
 $67,189
 $1,766,608
 $(2,967) $1,763,641





See notes to the consolidated financial statements.

F-14


AIMCO PROPERTIES, L.P.
CONSOLIDATED STATEMENTS OF CASH FLOWS
For the Years Ended December 31, 2015, 20142018, 2017 and 2016
(In thousands)
 2018 2017 2016
CASH FLOWS FROM OPERATING ACTIVITIES:     
Net income$716,603
 $347,079
 $483,273
Adjustments to reconcile net income to net cash provided by operating activities:     
Depreciation and amortization377,786
 366,184
 333,066
Provision for real estate impairment loss
 35,881
 
Gain on dispositions of real estate and the Asset Management business(677,463) (300,849) (400,156)
Income tax benefit(13,027) (30,836) (18,842)
Share-based compensation expense8,550
 7,877
 7,629
Amortization of debt issue costs and other9,023
 5,666
 5,060
Other, net1,065
 (7,694) (6,071)
Changes in operating assets and operating liabilities:     
Accounts receivable and other assets(27,830) (15,841) (22,294)
Accounts payable, accrued liabilities and other1,681
 (15,395) (5,164)
Total adjustments(320,215) 44,993
 (106,772)
Net cash provided by operating activities396,388
 392,072
 376,501
CASH FLOWS FROM INVESTING ACTIVITIES:     
Purchases of real estate and deposits related to purchases of real estate(242,297) (20,372) (290,729)
Capital expenditures(340,489) (358,104) (346,645)
Proceeds from dispositions of real estate708,848
 401,983
 535,513
Purchases of corporate assets(7,718) (8,899) (7,540)
Proceeds from repayments on notes receivable5,010
 430
 412
Other investing activities(1,508) (2,019) 9,842
Net cash provided by (used in) investing activities121,846
 13,019
 (99,147)
CASH FLOWS FROM FINANCING ACTIVITIES:     
Proceeds from non-recourse property debt1,228,027
 312,434
 417,714
Principal repayments on non-recourse property debt(976,087) (409,167) (371,947)
(Repayment of) proceeds from term loan(250,000) 250,000
 
Net borrowings on (repayments of) revolving credit facility93,200
 49,230
 (9,070)
Payment of debt issue costs(11,961) (4,751) (7,816)
Payment of debt extinguishment costs(14,241) (399) (391)
Repurchases of common partnership units held by General Partner and Special Limited Partner(373,593) 
 
Redemption of preferred units from Aimco
 
 (34,799)
Payment of distributions to preferred units(16,334) (16,358) (17,253)
Payment of distributions to General Partner and Special Limited Partner(237,504) (225,377) (206,279)
Payment of distributions to Limited Partners(11,987) (10,668) (10,214)
Payment of distributions to noncontrolling interests(9,469) (8,367) (18,253)
Redemption of common and preferred units(9,885) (13,546) (12,544)
Purchases of noncontrolling interests in consolidated real estate partnerships(3,579) (314,269) (13,941)
Other financing activities5,233
 (2,462) 844
Net cash used in financing activities(588,180) (393,700) (283,949)
NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH(69,946) 11,391
 (6,595)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD142,541
 131,150
 137,745
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD$72,595
 $142,541
 $131,150



See notes to the consolidated financial statements.

AIMCO PROPERTIES, L.P.
CONSOLIDATED STATEMENTS OF CASH FLOWS
2013For the Years Ended December 31, 2018, 2017 and 2016
(In thousands)

2015 2014 20132018 2017 2016
SUPPLEMENTAL CASH FLOW INFORMATION:          
Interest paid$207,087
 $231,887
 $273,635
$199,996
 $196,438
 $200,278
Cash paid for income taxes2,033
 1,657
 629
11,522
 7,401
 2,152
Non-cash transactions associated with the acquisition or disposition of real estate:          
Non-recourse property debt assumed in connection with our acquisition of real estate
 65,200
 14,767
Non-recourse property debt assumed by buyer in connection with our disposition of real estate6,068
 58,410
 126,663
Non-recourse, subordinate debt of the disposed legacy asset management business forgiven in connection with the disposition of real estate
 
 8,149
Non-recourse property debt assumed by buyer in connection with the disposition of the Asset Management business227,708
 
 
Non-recourse property debt assumed in connection with the acquisition of real estate208,885
 
 
Issuance of preferred OP Units in connection with acquisition of real estate
 9,117
 

 
 17,000
Issuance of common OP Units in connection with acquisition of real estate50,151
 
 
Other non-cash investing and financing transactions:          
Issuance of common OP Units for acquisition of noncontrolling interests in consolidated real estate partnerships
 
 416
Accrued capital expenditures43,725
 45,701
 45,571
Accrued dividends on TSR restricted stock awards (Note 11)309
 
 
Accrued capital expenditures (at end of period)40,185
 31,719
 35,594
Accrued dividends on TSR restricted stock and LTIP awards (at end of period) (Note 8)2,217
 1,818
 927



































See notes to the consolidated financial statements.

F-15


APARTMENT INVESTMENT AND MANAGEMENT COMPANY
AIMCO PROPERTIES, L.P.
NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS
December 31, 20152018

Note 1 — Organization
Apartment Investment and Management Company, or Aimco, is a Maryland corporation incorporated on January 10, 1994. Aimco is a self-administered and self-managed real estate investment trust, or REIT. AIMCO Properties, L.P., or the Aimco Operating Partnership, is a Delaware limited partnership formed on May 16, 1994, to conduct our business, which is focused on the ownership, management, redevelopment and limited development of quality apartment communities located in several of the largest coastal and job growth markets in the United States.
Aimco, through its wholly-owned subsidiaries, AIMCO-GP, Inc. and AIMCO-LP Trust, owns a majority of the ownership interests in the Aimco Operating Partnership. Aimco conducts all of its business and owns all of its assets through the Aimco Operating Partnership. Interests in the Aimco Operating Partnership that are held by limited partners other than Aimco are referred to as “OPOP Units. OP Units include common partnership units, high performance partnership units and partnership preferred units, which we refer to as common OP Units, HPUs andas well as partnership preferred units, which we refer to as preferred OP Units, respectively. We also refer to HPUs as common partnership unit equivalents. AtUnits. As of December 31, 2015,2018, after eliminations for units held by consolidated subsidiaries, the Aimco Operating Partnership had 164,179,533158,140,169 common partnership units and equivalents outstanding. AtAs of December 31, 2015,2018, Aimco owned 156,326,416149,133,826 of the common partnership units (95.2%(94.3% of the common partnership units and equivalentsunits) of the Aimco Operating Partnership)Partnership and Aimco had outstanding an equal number of shares of its Class A Common Stock, which we refer to as Common Stock.
Except as the context otherwise requires, “we,” “our” and “us” refer to Aimco, the Aimco Operating Partnership and their consolidated subsidiaries, collectively.
As of December 31, 2015,2018, we owned an equity interest in 140 conventional134 apartment communities with 40,46436,549 apartment homes in our Real Estate portfolio. Our Real Estate portfolio, is diversified by both price point and geography and consists of market rate apartment communities in which we own a substantial interest. We consolidated 130 of these apartment communities with 36,407 apartment homes and 56 affordable apartmentthese communities with 8,685 apartment homes. Of these apartment communities, we consolidated 136 conventional apartment communities with 40,322 apartment homes and 49 affordable apartment communities with 7,998 apartment homes. These conventional and affordable apartment communities generated 90% and 10%, respectively, of the proportionate property net operating income (as defined in Note 15 and excluding amounts related to apartment communities sold or classified as held for sale) during the year ended December 31, 2015.comprise our reportable segment.
Note 2 — Basis of Presentation and Summary of Significant Accounting Policies
Principles of Consolidation
Aimco’s accompanying consolidated financial statements include the accounts of Aimco, the Aimco Operating Partnership and their consolidated subsidiaries. The Aimco Operating Partnership’s consolidated financial statements include the accounts of the Aimco Operating Partnership and its consolidated entities.
We consolidate all variable interest entities for which we are the primary beneficiary. Generally, a variable interest entity, or VIE, is a legal entity in which the equity investors do not have the characteristics of a controlling financial interest or the equity investors lack sufficient equity at risk for the entity to finance its activities without additional subordinated financial support. In determining whether we are the primary beneficiary of a VIE, we consider qualitative and quantitative factors, including, but not limited to: which activities most significantly impact the VIE’s economic performance and which party controls such activities; the amount and characteristics of our investment; the obligation or likelihood for us or other investors to provide financial support; and the similarity with and significance to our business activities and the business activities of the other investors. Significant judgments related to these determinations include estimates about the current and future fair values and performance of real estate held by these VIEs and general market conditions.
As of December 31, 2015, we were the primary beneficiary of, and therefore consolidated, 61 VIEs, which owned 47 apartment communities with 7,459 apartment homes. Substantially all of these VIEs are partnerships that operate qualifying affordable housing apartment communities and which are structured to provide for the pass-through of low-income housing tax credits and deductions to their partners. Real estate with a net book value of $335.1 million collateralized $325.2 million of debt of those VIEs. Any significant amounts of assets and liabilities related to our consolidated VIEs are identified parenthetically on our accompanying consolidated balance sheets. The creditors of the consolidated VIEs do not have recourse to our general credit.
In addition to the VIEs discussed above, at December 31, 2015, our consolidated financial statements included certain consolidated and unconsolidated VIEs that are part of the legacy asset management business we sold during 2012, which is

F-16


discussed insubsidiaries (see Note 313). The assets and liabilities related to these consolidated and unconsolidated VIEs are each condensed into single line items within other assets and accrued liabilities and other, respectively, in our consolidated balance sheets.
Generally, we consolidate real estate partnerships and other entities that are not variable interest entities when we own, directly or indirectly, a majority voting interest in the entity or are otherwise able to control the entity. All significant intercompany balances and transactions have been eliminated in consolidation.
Interests in the Aimco Operating Partnership that are held by limited partners other than Aimco are reflected in Aimco’s accompanying consolidated balance sheets as noncontrolling interests in Aimco Operating Partnership. Interests in partnerships consolidated intoby the Aimco Operating Partnership that are held by third parties are reflected in our accompanying consolidated balance sheets as noncontrolling interests in consolidated real estate partnerships. The assets of consolidated real estate partnerships owned or controlledconsolidated by the Aimco Operating Partnership generally aremust first be used to settle the liabilities of such consolidated real estate partnerships. These consolidated real estate partnerships’ creditors do not availablehave recourse to pay creditorsthe general credit of Aimco or the Aimco Operating Partnership.
As used herein, and except where the context otherwise requires, “partnership” refers to a limited partnership or a limited liability company and “partner” refers to a partner in a limited partnership or a member of a limited liability company.
Acquisition of Real Estate Assets and Related Depreciation and Amortization
We generally recognize the acquisition of apartment communities or interests in partnerships that own apartment communities at fair value. If the transaction results in consolidation and the apartment community is considered a business, we expense related transaction costs as incurred. If the apartment community is considered an asset (e.g. apartment communities under construction or vacant at time of acquisition), theour cost. The related transaction costs are capitalized and allocated toincluded in the cost of the acquired assets. apartment community.
We allocate the cost of acquired apartment communities to tangibleacquired based on the relative fair value of the assets and identified intangible assetsacquired and liabilities based on their fair values.assumed. We determine the fair value of tangible assets, such as land, building,buildings, furniture, fixtures and equipment, generally using internal valuation techniques that consider comparable market transactions, replacement costs and other available information. We determine the fair value of identified intangible assets (or liabilities),or liabilities, which typically relate to in-place leases, using internal valuation techniques that consider the terms of the in-place leases, current market data for comparable leases and our experience in leasing similar communities.
The intangible assets or liabilities related to in-place leases are comprised of: (a) the value of the above- and below-market leases in-place, measured over the period, including estimatedprobable lease renewals for below-market leases, that the leases are

expected to remain in effect; (b) the estimated unamortized portion of avoided leasing commissions and other costs that ordinarily would be incurred to originate the in-place leases; and (c) the value associated with vacantleased apartment homes during thean estimated absorption period, (estimates of lostwhich estimates rental revenue duringthat would not have been earned had leased apartment homes been vacant at the expectedtime of acquisition, assuming lease-up periods based on market demand and stabilized occupancy levels at the time of acquisition).levels.
Depreciation for all tangible real estate assets is calculated using the straight-line method over their estimated useful lives. Acquired buildings and improvements are depreciated over a useful life based on the age, condition and other physical characteristics of the apartment community. At December 31, 2015,2018, the weighted average depreciable life of our acquired buildings and improvements was approximately 3028 years. Furniture, fixtures and equipment associated with acquired apartment communities are depreciated over five years.
The values of the above- and below-market leaseslease intangibles are amortized to rental revenue over the expected remaining terms of the associated leases, which include reasonably assured renewal periods. Other intangible assets related to in-place leases are amortized to depreciation and amortization over the expected remaining terms of the associated leases.
At December 31, 20152018 and 2014,2017, deferred income in our consolidated balance sheets includesincluded below-market lease amounts totaling $12.1$18.7 million and $13.8$9.1 million, respectively, which are net of accumulated amortization of $31.4$36.7 million and $29.7$34.4 million, respectively. During the years ended December 31, 2015, 20142018, 2017 and 2013,2016, we included amortization of below-market leases of $1.7$2.3 million, $1.3 million and $2.9$1.7 million, respectively, in rental and other property revenues in our consolidated statements of operations. In connection with apartment communities sold during the year ended
At December 31, 2014, we wrote off $1.8 million of unamortized below-market lease amounts to gain on dispositions of real estate. There were no such write offs during the years ended December 31, 2015 and 2013.
At December 31, 2015,2018, our below-market leases had a weighted average amortization period of 6.76.3 years and estimated aggregate amortization for each of the five succeeding years as follows (in thousands):
  2016 2017 2018 2019 2020
Estimated amortization $1,337
 $1,239
 $1,095
 $1,007
 $915
 Estimated Amortization
2019
$1,986
20201,741
20211,668
20221,621
20231,571

F-17


Capital Additions and Related Depreciation
We capitalize costs, including certain indirect costs, incurred in connection with our capital additions activities, including redevelopment, development and construction projects,redevelopments, developments, other tangible apartment community improvements and replacements of existing apartment community components. Included in these capitalized costs are payroll costs associated with time spent by site employees in connection with capital additions activities at the apartment community level. We characterize as “indirect costs” an allocation of certain department costs, including payroll, at the area operations and corporate levels that clearly relate to capital additions activities. We also capitalize interest, property taxes and insurance during periods in which redevelopment, developmentredevelopments, developments and construction projects are in progress. We commencebegin capitalization of costs, including certain indirect costs, incurred in connection with our capital addition activities, at the point in time whenupon commencement of activities necessary to getready apartment communities ready for their intended use are in progress. This includesuse. These activities include when apartment communities or apartment homes are undergoing physical construction, as well as when apartment homes are held vacant in advance of planned construction, provided that other activities such as permitting, planning and design are in progress. We cease the capitalization of costs when the assetsapartment communities are substantially complete and ready for their intended use, which is typically when construction has been substantially completed and apartment homes are available for occupancy. We charge to property operating expense, as incurred, costsCosts, including ordinary repairs, maintenance and resident turnover costs.costs, are charged to property operating expense as incurred.
We depreciate capitalized costs using the straight-line method over the estimated useful life of the related component or improvement, which is generally 5,, 15 or 30 years. All capitalized site payroll costs and indirect costs are allocated to capital additions proportionately based on direct costs, among capital projects and depreciated over the estimated useful lives of such projects.capital additions.
Certain homogeneous items that are purchased in bulk on a recurring basis, such as carpeting and appliances, are depreciated using group methods that reflect the average estimated useful life of the items in each group. Except in the case of apartment community casualties, where the net book value of the lost asset is written off in the determination of casualty gains or losses, we generally do not recognize any loss in connection with the replacement of an existing apartment community component because normal replacements are considered in determining the estimated useful lives used in connection with our composite and group depreciation methods.

For the years ended December 31, 2015, 20142018, 2017 and 2013,2016, we capitalized to buildings and improvements $11.7$7.6 million, $14.2$7.6 million and $17.6$9.6 million of interest costs, respectively, and $28.2$36.8 million, $29.2$36.0 million and $33.2$32.9 million of other direct and indirect costs, respectively.
Impairment of Long-Lived Assets
Real estate and other long-lived assets to be held and used are stated at cost, less accumulated depreciation and amortization, unless the carrying amount of the asset is not recoverable. If events or circumstances indicate that the carrying amount of an apartment community may not be recoverable, we make an assessment of its recoverability by comparing the carrying amount to our estimate of the undiscounted future cash flows, excluding interest charges, of the apartment community. If the carrying amount exceeds the aggregate undiscounted future cash flows, we recognize an impairment loss to the extent the carrying amount exceeds the estimated fair value of the apartment property.community.
Based on periodic tests of recoverability of long-lived assets, for the year ended December 31, 2014, we recorded a provision for real estate impairment losses of $1.8 million related to sold apartment communities, and we recorded no such provisions during the years ended December 31, 2015 and 2013.
Cash Equivalents
We classify highly liquid investments with an original maturity of three months or less as cash equivalents. We maintain cash equivalents in financial institutions in excess of insured limits. We have not experienced any losses in these accounts in the past and believe that we are not exposed to significant credit risk because our accounts are deposited with major financial institutions.
Restricted Cash
Restricted cash includes capital replacement reserves, completion repair reserves, bond sinking fund amounts, tax and insurance escrow accounts held by lenders and resident security deposits.

F-18


Other Assets
At December 31, 20152018 and 2014,2017, other assets was comprised of the following amounts (dollars in thousands):
 2015 2014
Deferred financing costs, net$26,126
 $30,320
Investments in unconsolidated real estate partnerships15,401
 16,046
Investments in securitization trust that holds Aimco property debt65,502
 61,043
Intangible assets, net45,447
 49,441
Deferred tax asset, net (Note 8)26,117
 252
Assets related to the legacy asset management business (Note 3)156,389
 161,135
Prepaid expenses, accounts and notes receivable, deposits and other138,936
 158,490
Other assets per consolidated balance sheets$473,918
 $476,727
 2018 2017
Investments in securitization trust that holds Aimco property debt$83,587
 $82,794
Deferred tax asset, net (Note 9)67,060
 32,227
Intangible assets, net43,424
 38,701
Prepaid expenses, real estate taxes and insurance25,657
 25,144
Software, equipment and leasehold improvements18,309
 20,048
Investments in unconsolidated real estate partnerships12,650
 12,636
Accounts and notes receivable, net55,630
 17,035
Deferred costs, deposits and other45,224
 44,154
Total other assets$351,541
 $272,739
DeferredThe table above excludes other assets of partnerships served by our Asset Management business at December 31, 2017, as they are presented separately on our consolidated balance sheet.
Investments in Securitization Trust that holds Aimco Property Debt
We hold investments in a securitization trust that primarily holds certain of our property debt. These investments were initially recognized at their purchase price and the discount to the face value is being accreted into interest income over the expected term of the securities. We have designated these investments as available for sale, or AFS, debt securities and we measure these investments at fair value with changes in their fair value, other than the changes attributed to the accretion described above, recognized as an adjustment of accumulated other comprehensive income or loss within equity and partners’ capital. Refer to Note 11 for further information regarding these debt securities.
Intangible Assets
At December 31, 2018 and 2017, other assets included goodwill associated with our reportable segment of $37.8 million. We perform an annual impairment test of goodwill by evaluating qualitative factors to determine the likelihood that goodwill may be impaired. We primarily consider the fair value of our real estate portfolio and the fair value of our debt relative to their carrying values. As a result of the qualitative analysis, we do not believe our goodwill is impaired as of the date of our annual test.

Capitalized Software Costs, Equipment and Leasehold Improvements
We defer lender feesPurchased software and other direct costs incurred in obtaining new financingrelated to software purchased or developed for internal use are capitalized during the application development stage and amortizeare amortized using the amountsstraight-line method over the termsestimated useful life of the software, generally three to five years. Purchased equipment is recognized at cost and depreciated using the straight-line method over the estimated useful life of the asset, which is generally five years. Leasehold improvements are also recorded at cost and depreciated on a straight-line basis over the shorter of the asset’s estimated useful life or the term of the related loan agreements. Amortization of these costs is included in interest expense.
We defer leasing commissions and other direct costs incurred in connection with successful leasing efforts and amortize the costs over the terms of the related leases. Amortization of these costs is included in depreciation and amortization.lease.
Investments in Unconsolidated Real Estate Partnerships
We own general and limited partner interests in partnerships that either directly, or through interests in other real estate partnerships, own apartment communities. We generally account for investments in real estate partnerships that we do not consolidate under the equity method. Under the equity method, we recognize our share of the earnings or losses of the entity for the periods being presented, is included in equity in earnings or losses from unconsolidated real estate partnerships (within other, net in our consolidated statements of operations), inclusive of our share of any impairments and disposition gains recognized by and related to such entities.entities, and we present such amounts within other, net in our consolidated statements of operations.
The excess of the cost of the acquired partnership interests over the historical carrying amount of partners’ equity or deficit is generally ascribed generally to the fair values of land and buildings owned by the partnerships. We amortize the excess cost related to the buildings over the related estimated useful lives. Such amortization is recorded as a componentan adjustment of equity inthe amounts of earnings or losses we recognize from such unconsolidated real estate partnerships.
InvestmentsDeferred Costs
We defer, as debt issue costs, lender fees and other direct costs incurred in Securitization Trust that holds Aimco Property Debt
We hold investments in a securitization trust which primarily holds certain of our property debt. These investments were initially recognized at their purchase priceobtaining new financing and amortize the discount to the face value is being accreted into interest incomeamounts over the expectedterms of the related loan agreements. In connection with the modification of existing financing arrangements, we defer lender fees and amortize these costs and any unamortized debt issue costs over the term of the securities. We have designated these investments as available for sale securities and we measure these investments at fair value with changes in their fair value, other than the changes attributed to the accretion described above, recognized as an adjustment of accumulated other comprehensive income or loss within equity and partners’ capital. Refer to Note 6 for further information regarding these securities.
Intangible Assets
At December 31, 2015 and 2014, other assets included goodwillmodified loan agreement. Debt issue costs associated with our reportable segmentsrevolving credit facility are included in other assets on our consolidated balance sheets. Debt issue costs associated with non-recourse property debt and our term loan are presented as a direct deduction from the related liabilities on our consolidated balance sheets. When financing arrangements are repaid or otherwise extinguished prior to maturity, unamortized debt issue costs are written off, additionally, any lender fees or other costs incurred in connection with the extinguishment are recognized. Amortization and write-off of $43.9 milliondebt issue costs and $45.1 million, respectively. other extinguishment costs are included in interest expense on our consolidated statements of operations.
We perform an annual impairment test of goodwill that comparesdefer leasing commissions and other direct costs incurred in connection with successful leasing efforts and amortize the fair value of reporting units with their carrying amounts, including goodwill. We determined that our goodwill was not impaired in 2015, 2014 or 2013.
Duringcosts over the years ended December 31, 2015, 2014 and 2013, we allocated $1.2 million, $3.9 million and $5.5 million, respectively, of goodwill related to our reportable segments (conventional and affordable real estate operations) to the carrying amountsterms of the apartment communities sold or classified as held for sale. The amounts of goodwill allocated to these apartment communities were based on the relative fair valuesrelated leases. Beginning in 2019, in connection with our adoption of the apartment communities sold or classified as heldnew accounting standard for sale and the retained portions of the reporting units toleases, which the goodwill as allocated.
Intangible assets also includes amounts related to in-place leases asis further discussed under the AcquisitionRecent Accounting Pronouncements heading below, such costs will be deferred when they are incremental and would not have incurred if the contract had not been obtained. Amortization of Real Estate Assets and Related Depreciation and Amortization heading.

F-19


Capitalized Software Costs
Purchased software and otherthese costs related to software developed for internal use are capitalized during the application development stage and are amortized using the straight-line method over the estimated useful life of the software, generally five years. For the years ended December 31, 2015, 2014 and 2013, we capitalized software purchase and development costs totaling $3.6 million, $4.4 million and $3.3 million, respectively. At December 31, 2015 and 2014, other assets included $16.4 million and $19.7 million of net capitalized software, respectively. During the years ended December 31, 2015, 2014 and 2013, we recognized amortization of capitalized software of $6.9 million, $6.7 million and $8.9 million, respectively, which is included in depreciation and amortization in our consolidated statements of operations.amortization.
Noncontrolling Interests in Consolidated Real Estate Partnerships
We report the unaffiliated partners’ interests in the net assets of our consolidated real estate partnerships as noncontrolling interests in consolidated real estate partnerships within consolidated equity and partners’ capital. Noncontrolling interests in consolidated real estate partnerships consist primarily of equity interests held by limited partners in consolidated real estate partnerships that have finite lives. We generally attribute to noncontrolling interests their share of income or loss of consolidated partnerships based on their proportionate interest in the results of operations of the partnerships, including their share of losses even if such attribution results in a deficit noncontrolling interest balance within our equity and partners’ capital accounts.
The terms of the related partnership agreements generally require the partnerships to be liquidated following the sale of the underlying real estate. As the general partner in these partnerships, we ordinarily control the execution of real estate sales and other events that could lead to the liquidation, redemption or other settlement of noncontrolling interests. However, as discussed in Note 3, we continue to consolidate certain partnerships and apartment communities associated with the legacy asset management business for which the derecognition criteria associated with our sale of the portfolio have not been met. We do not control the execution of sales and other events related to the assets that will lead to the to the liquidation of these partnerships and derecognition of the associated noncontrolling interests. The aggregate carrying amount of noncontrolling interests in consolidated real estate partnerships totaled $151.4 million and $233.3 million at December 31, 2015 and 2014, respectively. These noncontrolling interests included $0.1 million (deficit) and $44.1 million, respectively, associated with the noncontrolling interests in the legacy asset management business at December 31, 2015 and 2014.
Changes in our ownership interest in consolidated real estate partnerships generally consist of our purchase of an additional interest in or the sale of our entire interest in a consolidated real estate partnership. The effect on our equity and partners’ capital of our purchase of additional interests in consolidated real estate partnerships during the years ended December 31, 2015, 20142018, 2017 and 20132016, is shown in our consolidated statements of equity and partners’ capital and further discussed in Note 3.capital. The effect on our equity and partners’ capital of sales of consolidated real estate or sales of our entire interest in consolidated real estate partnerships is reflected in our consolidated financial statements as salesgains on disposition of real estate and accordingly the effect on our equity and partners’ capital is reflected within the the amount of net income attributableallocated to us and to noncontrolling interests. In accordance with FASB Accounting Standards Codification, or ASC, Topic 810, uponUpon our deconsolidation of a real estate partnership following the sale of our partnership interests or liquidation of the partnership following sale of the related apartment community,

we derecognize any remaining noncontrolling interest of the associated partnership previously recorded in our consolidated balance sheets.
Noncontrolling Interests in Aimco Operating Partnership
Noncontrolling interests in Aimco Operating Partnership consist of common OP Units HPUs and preferred OP Units. Within Aimco’s consolidated financial statements, the Aimco Operating Partnership’s income or loss is allocated to the holders of common partnership units and equivalents based on the weighted average number of common partnership units (including those held by Aimco) and equivalents outstanding during the period. During the years ended December 31, 2015, 2014 and 2013, the holders of common OP Units and equivalents had a weighted average ownership interest in the Aimco Operating Partnership of 4.7%, 5.0% and 5.2%, respectively. Holders of the preferred OP Units participate in the Aimco Operating Partnership’s income or loss only to the extent of their preferred distributions. Within Aimco’s consolidated financial statements, after provision for Preferred OP Unit distributions, the Aimco Operating Partnership’s income or loss is allocated to the holders of common partnership units based on the weighted average number of common partnership units (including those held by Aimco) outstanding during the period. During the years ended December 31, 2018, 2017 and 2016, the holders of common OP Units had a weighted average ownership interest in the Aimco Operating Partnership of 4.9%, 4.5% and 4.7%, respectively. See Note 107 for further information regarding the items comprising noncontrolling interests in the Aimco Operating Partnership.
Revenue Recognitionfrom Leases
Our apartment communities have operating leases with apartment residents with terms averaging 12 months.13 months. We recognize rental revenue related to these leases, net of any concessions, on a straight-line basis over the term of the lease. We recognizeOur operating leases with residents also provide that the resident reimburse us for certain costs, primarily the resident’s share of utilities expenses, incurred by the apartment community. These reimbursements are variable payments pursuant to the related lease and recognized as income when the utility expense is incurred. Reimbursement and related expense are presented on a gross basis in our consolidated statements of operations, with the reimbursement included in rental and other property revenues from property management,on our consolidated statements of operations.
Asset Management Business
Prior to the July 2018 sale of our Asset Management business, we provided asset management syndicationand other services to certain consolidated partnerships owning apartment communities that qualify for low-income housing tax credits and are structured to provide for the pass-through of tax credits and tax deductions to their partners. We recognized income from asset management and other services when the related fees arewere earned and are realized or realizable.

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TableThe tax credits were generally realized ratably over the first ten years of Contentsthe tax credit arrangement and are subject to the partnership’s compliance with applicable laws and regulations for a period of 15 years. We held nominal ownership positions in these partnerships, generally less than one percent, and sold these interests to an unrelated third party in July 2018. In our role, we provided asset management and other services to these partnerships and we received fees and other payments in return.
Capital contributions received by the partnerships from tax credit investors represented, in substance, consideration that we received in exchange for our obligation to deliver tax credits and other tax benefits to the investors. We recorded these contributions as deferred income in our consolidated balance sheets upon receipt, and we recognized these amounts as revenue in our consolidated statements of operations when our obligation to the investors is relieved upon delivery of the tax benefits. This obligation transferred to the buyer along with our interest in the partnerships.

Prior to the sale of our interests in the partnerships, we consolidated the low-income housing tax credit partnerships in which we were the sole general partner, because we were the sole decision maker of the partnerships. When the contractual arrangements obligated us to deliver tax benefits to the investors, and entitled us through fee arrangements to receive substantially all available cash flow from the partnerships, we recognized the income or loss generated by the underlying real estate based on our economic interest in the partnerships’ current period results, which was approximately 100% and represented the allocation of cash available for distribution we would receive from a hypothetical liquidation at the book value of the partnership’s net assets. Our economic interests generally differed from our legal interests. Upon the sale of our interests in these partnerships, we deconsolidated these partnerships and removed the obligation to deliver future tax credits and benefits, represented by the remaining deferred income as a component of our gain on the sale of the business.
Insurance
We believe that our insurance coverages insure our apartment communities adequately against the risk of loss attributable to fire, earthquake, hurricane, tornado, flood and other perils. In addition, we have third-party insurance coverage for substantial portions(after self-insured retentions) that defray the costs of our property,large workers’ compensation, health and general liability exposures. Losses are accruedWe accrue losses based upon our estimates of the aggregate liability for uninsured losses incurred using certain actuarial assumptions followed in the insurance industry and based on our experience.

Share-Based Compensation
We issue various forms of share-based compensation, including stock options and restricted stock awards with service conditions and/or market conditions. We recognize share-based employee compensation related to restricted stock awards and employee stock options, based on the fair value on the grant date fair value and recognize compensation cost net of forfeitures, over the awards’ requisite service periods. We reduce compensation cost related to forfeited awards in the period of forfeiture. See Note 118 for further discussion of our share-based compensation.
Tax Credit Arrangements
We sponsor certain partnerships that operate qualifying affordable housing apartment communities and are structured to provide for the pass-through of tax credits and deductions to their partners. The tax credits are generally realized ratably over the first ten years of the tax credit arrangement and are subject to the partnership’s compliance with applicable laws and regulations for a period of 15 years. Typically, we are the general partner with a legal ownership interest of one percent or less and unaffiliated institutional investors (which we refer to as tax credit investors or investors) acquire the limited partnership interests (at least 99%). At inception, each investor agrees to fund capital contributions to the partnerships and we receive a syndication fee from the partnerships upon the investors’ admission to the partnership.
We have determined that the partnerships in these arrangements are VIEs and, where we are general partner, we are generally the primary beneficiary that is required to consolidate the partnerships. When the contractual arrangements obligate us to deliver tax benefits to the investors, and entitle us through fee arrangements to receive substantially all available cash flow from the partnerships, we account for these partnerships as wholly-owned subsidiaries, recognizing the income or loss generated by the underlying real estate based on our economic interest in the partnerships. Capital contributions received by the partnerships from tax credit investors represent, in substance, consideration that we receive in exchange for our obligation to deliver tax credits and other tax benefits to the investors. We record these contributions as deferred income in our consolidated balance sheet upon receipt, and we recognize these amounts as revenue in our consolidated statements of operations when our obligation to the investors is relieved upon delivery of the tax benefits.
Income Taxes
We haveAimco has elected to be taxed as a REIT under the Internal Revenue Code commencing with ourits taxable year ended December 31, 1994, and intendit intends to continue to operate in such a manner. OurAimco’s current and continuing qualification as a REIT depends on ourits ability to meet the various requirements imposed by the Internal Revenue Code, which are related to organizational structure, distribution levels, diversity of stock ownership and certain restrictions with regard to owned assets and categories of income. If we qualifyAimco qualifies for taxation as a REIT, weit will generally not be subject to United States Federalfederal corporate income tax on ourits taxable income that is currently distributed to stockholders. This treatment substantially eliminates the “double taxation” (at the corporate and stockholder levels) that generally results from an investment in a corporation.
Even if we qualifyAimco qualifies as a REIT, weit may be subject to United States Federalfederal income and excise taxes in various situations, such as on our undistributed income. WeAimco also will be required to pay a 100% tax on any net income on non-arm’s length transactions between usit and a TRS (described below) and on any net income from sales of apartment communities that were held for sale to customers in the ordinary course. In addition, we could also be subject to the alternative minimum tax, or AMT, on our items of tax preference. The state and local tax laws may not conform to the United States Federalfederal income tax treatment, and weAimco may be subject to state or local taxation in various state or local jurisdictions, including those in which we transact business. Any taxes imposed on us reduce our operating cash flow and net income.
Certain of our operations or a portion thereof, including property management, asset management and risk management, are conducted through taxable REIT subsidiaries, which are subsidiaries of the Aimco Operating Partnership, and each of which we refer to as a TRS. A TRS is a subsidiary C-corporation that has not elected REIT status and as such is subject to United States Federalfederal corporate income tax. We use TRS entities to facilitate our ability to offer certain services and activities to our residents and investment partners that cannot be offered directly by a REIT. We also use TRS entities to hold investments in certain apartment communities.

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For our TRS entities, deferred income taxes result from temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for United States Federalfederal income tax purposes, and are measured using the enacted tax rates and laws that are expected to be in effect when the differences reverse. We reduce deferred tax assets by recording a valuation allowance when we determine, based on available evidence, that it is more likely than not that the assets will not be realized. We recognize the tax consequences associated with intercompany transfers between the REITAimco Operating Partnership and TRS entities when the related assets affect our GAAP income or loss, generally through depreciation, impairment losses, or sales to third party entities.such transactions occur. Refer to Note 89 for further information about our income taxes.
Discontinued Operations
In April 2014, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity, or ASU 2014-08. ASU 2014-08 revised the definition of, and the requirements for reporting, a “discontinued operation.” Specifically, ASU 2014-08 revised the reporting requirements to only allow a component of an entity, or group of components of an entity, to be reported in discontinued operations if their disposal represents a “strategic shift that has (or will have) a major effect on an entity’s operations and financial results.”
For public companies, ASU 2014-08 was required to be applied prospectively to disposals of components of an entity or classifications as held for sale of components of an entity that occur in annual periods commencing after December 15, 2014; however, as permitted by the transition provisions, we elected to adopt ASU 2014-08 effective January 1, 2014, for disposals (or classifications as held for sale) that had not been reported in financial statements previously issued.
Under ASU 2014-08, we believe routine sales of apartment communities and certain groups of apartment communities generally do not meet the requirements for reporting within discontinued operations. In accordance with GAAP prior to our adoption of ASU 2014-08, we reported the results of apartment communities that met the definition of a component of an entity and had been sold or met the criteria to be classified as held for sale as discontinued operations. For years ended December 31, 2013, or earlier, and interim periods within those years, we included the results of such apartment communities, including any gain or loss on their disposition, less applicable income taxes, in income from discontinued operations within the consolidated statements of operations. See Note 12 for additional information regarding discontinued operations.
Comprehensive Income or Loss
As discussed under the preceding Investments in Securitization Trust that holds Aimco Property Debt heading, we have investments in debt securities that are measured at fair value with unrealized gains or losses recognized as an adjustment of accumulated other comprehensive loss within equity and partners’ capital. Additionally, as discussed in Note 6,during the year ended December 31, 2018, we recognizerecognized changes in the fair value of our cash flow hedges as an adjustment of accumulated other comprehensive loss within equity and partners’ capital.capital until the July 2018 sale of the Asset Management business. The amounts of consolidated comprehensive income for the years ended December 31, 2015, 20142018, 2017 and 2013,2016, along with the corresponding amounts of such comprehensive income attributable to Aimco, the Aimco Operating Partnership and to noncontrolling interests, isare presented within the accompanying consolidated statements of comprehensive income.
Earnings per Share and Unit
Aimco calculatesand the Aimco Operating Partnership calculate earnings (loss) per share and unit based on the weighted average number of shares of Common Stock or common partnership units, participating securities, common stock equivalents and dilutive convertible securities outstanding during the period. The Aimco Operating Partnership calculates earnings (loss) peror common unit based on the weighted average number of common partnership units and equivalents participating securities and dilutive convertible securities outstanding during the period. The Aimco Operating Partnership considers both common partnership units and HPUs,equivalents, which have identical rights to distributions and undistributed earnings, to be common units for purposes of the earnings per unit computations. See Note 1310 for further information regarding earnings per share and unit computations.
Use of Estimates
The preparation of our consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts included in the financial statements and accompanying notes thereto. Actual results could differ from those estimates.
Recent
Reclassifications
Certain items included in the 2017 and 2016 consolidated financial statements have been reclassified to conform to the current presentation. We have also reclassified certain items on our consolidated statements of operations to comply with the SEC disclosure amendments summarized below.
Accounting Pronouncements Adopted in the Current Year
In May 2014,Effective January 1, 2018, we adopted a new standard issued by the FASB and InternationalFinancial Accounting Standards Board, issued their final standard on revenue from contracts with customers, which was issued by theor FASB, as Accounting Standards Update 2014-09, Revenue from Contracts with Customers, or ASU 2014-09. ASU 2014-09, which establishes a single comprehensive model for entities to use inthat affects accounting for revenue. Under this new standard, revenue arising from contracts with customers, supersedes most current GAAP applicable to revenue recognition and converges United States and international accounting standards in this area. The core principle of the new guidance is that revenue shall only be

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generally recognized when an entity has transferred control of goods or services to a customer and for an amount reflecting the consideration to which the entity expects to be entitled for such exchange.
The new revenue standard also introduced new guidance for accounting for other income, including how we measure gains or losses on the sale of real estate. We adopted the new standard using the modified retrospective transition method effective January 1, 2018, with no effect on our results of operations or financial position.
Effective January 1, 2018, we also adopted new standards issued by the FASB that affect the presentation and disclosure of the statements of cash flows. We are now required to present combined inflows and outflows of cash, cash equivalents, and restricted cash in the consolidated statement of cash flows. Previously our consolidated statements of cash flows presented transfers between restricted and unrestricted cash accounts as operating, financing and investing cash activities depending on the required or intended purpose for the restricted funds. The new guidance also requires debt prepayment and other extinguishment-related payments to be classified as financing activities. We previously classified such payments as operating activities. We have revised our consolidated statements of cash flows for the years ended December 31, 2017 and 2016 to conform to this presentation, and the effect of the revisions to net cash flows from operating, investing, and financing activities as previously reported are summarized in the following table (in thousands):
 2017 2016
 As Previously Reported Adjustments As Revised As Previously Reported Adjustments As Revised
Net cash provided by operating activities$394,139
 $(2,067) $392,072
 $377,724
 $(1,223) $376,501
Net cash used in investing activities14,704
 (1,685) 13,019
 (97,773) (1,374) (99,147)
Net cash used in financing activities(393,301) (399) (393,700) (269,496) (14,453) (283,949)
In 2018, the Securities Exchange Commission, or SEC, amended its rules to eliminate, modify, or integrate into other SEC requirements certain disclosure rules. The amendments are intended to simplify compliance without significantly changing the total mix of information provided to investors and were generally effective on November 5, 2018. The amendments remove the SEC rule that requires REITs to present gain or loss on the sale of real estate, net of income tax, in the statement of operations. Consistent with the SEC’s historical requirements, we previously presented gain or loss on dispositions of real estate below continuing operations and net of tax. For the year ended December 31, 2018, we present gain on dispositions of real estate as a component of income before income taxes in our consolidated statements of operations and we have revised the 2017 and 2016 comparative periods to conform to this presentation as follows:
 2017 2016
 As Previously Reported Adjustments As Revised As Previously Reported Adjustments As Revised
Income tax benefit32,126
 (1,290) 30,836
 25,208
 (6,366) 18,842
Gain on dispositions of real estate299,559
 1,290
 300,849
 393,790
 6,366
 400,156
Additionally, SEC rules previously required changes in equity subsequent to the prior year-end as either a separate financial statement or in the notes to interim financial statements. For interim periods in 2018, we presented changes in equity within a footnote to our interim condensed consolidated financial statements in accordance with the SEC rule. The amendments create a requirement to report changes in equity and dividends per share in interim periods on a comparative basis for both quarter-to-date and year-to-date periods presented. This disclosure is required for interim financial statements beginning in 2019; therefore, we will present comparative interim statements of stockholders equity beginning in our condensed consolidated financial statements for the three months ending March 31, 2019.

ASU 2014-09Recent Accounting Pronouncements
The FASB issued a new standard on lease accounting, which is effective for public entitiesus on January 1, 2019. Under the new lease standard, lessor accounting will be largely unchanged and lessees will be required to recognize a lease liability and related right of use asset for annual reporting periods beginning after December 15, 2017,all leases with early adoption permitted in years beginning after December 15, 2016,terms longer than 12 months, with such leases classified as either operating or finance. The standard may be adopted utilizing multiple practical expedients, and allows for full retrospective adoption appliedwe plan to all periods presented or modified retrospective adoption with the cumulative effect of initially applyingadopt the standard recognized atusing all practical expedients that aid in calculating the value of the lease liability and related right of use asset on the date of initial application. adoption, as well as the prospective practical expedient that allows lessors to combine lease and nonlease components where the timing and pattern of transfer are the same.
We havedo not yet determinedanticipate significant changes in the effect ASU 2014-09timing of income recognition from our leases with residents. However, in circumstances where we are a lessee, in primarily a limited population of ground leases and leases for corporate office space, we will havebe required to recognize lease liabilities and related right of use assets on our consolidated financial statements.

In February 2015,balance sheets. We anticipate recording lease liabilities and related right of use assets in amounts less than 1.5% of total assets as of December 31, 2018. Additionally, our adoption of the FASB issued Accounting Standards Update 2015-02, Consolidation (Topic 810): Amendmentsstandard will affect the manner in which we recognize costs incurred to obtain resident leases. Through December 31, 2018, we deferred certain costs based on the Consolidation Analysis, or ASU 2015-02, which significantly changespercentage of successful leases relative to all leasing candidates. Under the consolidation analysis required under GAAP for VIEs. Under this revised guidance, it is less likelynew standard, only costs that certain fees, such as asset management fees, would be considered variable interests and therefore fewer entitiesare contingent upon a signed lease may be considered VIEs. Additionally, limited partnerships may no longer be viewed as VIEs if the limited partners hold certain rights over the general partner. Alternatively, limited partnershipsdeferred. We do not previously viewed as VIEs may now be considered VIEs in the absence of such rights. For public companies, the guidance in ASU 2015-02 is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2015, with early adoption permitted. We will adopt the guidance in ASU 2015-02anticipate recording significant cumulative catch up adjustments in connection with our March 31, 2016, financial statements. We have substantially completed our analysis of the effect adoption of ASU 2015-02 will have on our consolidated financial statements. We anticipate the Aimco Operating Partnership and all non-wholly owned real estate partnerships will meet the revised characteristics of a VIE, resulting in additional disclosure; however, we do not expect to consolidate any presently unconsolidated entities or to deconsolidate any presently consolidated entities as a result of the accounting change.this standard.

In April 2015, the FASB issued ASU 2015-03, Interest—Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs, or ASU 2015-03, to revise the presentation of debt issuance costs. Under ASU 2015-03, entities generally will present debt issuance costs in their balance sheet as a direct deduction from the related debt liability rather than as an asset. Amortization of the deferred costs will continue to be included in interest expense. In August 2015, the FASB issued ASU 2015-15, Interest—Imputation of Interest (Subtopic 835-30): Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements—Amendments to SEC Paragraphs Pursuant to Staff Announcement at June 18, 2015 EITF Meeting  (SEC Update), or ASU 2015-15, to clarify the SEC staff’s position regarding the presentation and subsequent measurement of debt issuance costs related to line-of-credit arrangements due to the lack of guidance on this topic in ASU 2015-03. The SEC staff recently announced that it would not object to an entity deferring and presenting debt issuance costs associated with line-of-credit arrangements as an asset and subsequently amortizing the deferred debt issuance costs ratably over the term of the arrangement, regardless of whether there are any outstanding borrowings under the arrangement.

For public companies, the guidance in ASUs 2015-03 and 2015-15, which is to be applied retrospectively to all prior periods, is effective for fiscal years beginning after December 15, 2015, with early adoption permitted for financial statements that have not been previously issued. We will adopt the guidance in ASUs 2015-03 and 2015-15 in connection with our March 31, 2016, financial statements. We do not expect ASUs 2015-03 and 2015-15 to have a significant effect on our consolidated financial statements.


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Note 3 — Significant Transactions
Acquisitions of Apartment Communities
During the year ended December 31, 2015,2018, we acquired conventional apartment communities located in Atlanta, GeorgiaArlington, Virginia, Fairfax County, Virginia and Cambridge, Massachusettsin the Center City and during the year ended December 31, 2014, we acquired conventional apartment communities located in San Jose, California, Aurora, Colorado, Boulder, Colorado, Atlanta, Georgia and New York, New York.University City areas of Philadelphia. Summarized information regarding these acquisitions is set forth in the table below (dollars in thousands):
 Year Ended December 31,
 2015 2014
Number of apartment communities3
 6
Number of apartment homes300
 1,182
Acquisition price$129,150
 $291,925
Non-recourse property debt assumed (outstanding principal balance)
 65,200
Non-recourse property debt assumed (fair value)
 64,817
Total fair value allocated to land10,742
 70,961
Total fair value allocated to buildings and improvements118,366
 217,851
 2018
Number of apartment communities6
Number of apartment homes1,480
Purchase price (1)$483,066
Capitalized transaction costs7,591
Total fair value allocated to land69,177
Total fair value allocated to building and improvements424,718
Total fair value allocated to intangible assets9,700
Total fair value allocated to intangible liabilities12,938
(1)The gross purchase price of the Philadelphia portfolio consisted of $34.4 million in cash, $208.9 million of assumed property-level debt and the issuance of 1.2 million OP Units. In accordance with GAAP, the OP Units were valued at $41.08 per unit, the closing price of Aimco’s common share on May 1, 2018, the purchase date.
Dispositions of Apartment Communities and Assets Held for Sale
During the year ended December 31, 2014,2018, we also purchased entities that own 2.4 acressold for $590.0 million our Asset Management business and our four affordable apartment communities located in the heartHunters Point area of downtown La Jolla, California, adjoiningSan Francisco. The sale resulted in a gain of $500.3 million and overlooking La Jolla Covenet cash proceeds of $512.2 million, after payment of transaction costs and repayment of property-level debt encumbering the Pacific Ocean. The property, which is zoned for multifamily and mixed-use, is currently occupied by three small commercial buildings and a limited-service hotel, which is managed for us by a third party.
Asset Management Business Disposition
On December 19, 2012,Hunters Point apartment communities. In addition to the Hunters Point apartment communities, we sold the Napicofollowing apartment communities from our Real Estate portfolio during the years ended December 31, 2018, 2017 and 2016 (dollars in thousands):
 2018 2017 2016
Real Estate portfolio:     
Apartment communities sold4
 5
 7
Apartment homes sold1,334
 2,291
 3,045
Gain on dispositions of real estate$175,213
 $297,730
 $383,647

The apartment communities sold from our legacy asset management business. The transaction was primarily seller-financed,Real Estate portfolio during 2018, 2017 and the associated notes are scheduled to be repaid from the operation and liquidation2016 were predominantly located outside of the Napico portfolio and are collateralized by the buyer’s interestsour primary markets or in the portfolio. 
In accordance with the provisions of GAAP applicable to sales of real estate or interests therein, for accounting purposes, we have not recognized the sale and are accounting for the transaction under the profit sharing method. Until full payment has been received for the seller-financed notes or we otherwise meet the requirements to recognize the sale for accounting purposes, we will continue to recognize the portfolio’s assets and liabilities, each condensed into single line items within other assets and accrued liabilities and other, respectively, in our consolidated balance sheets, for all dates following the transaction. Similarly, we will continue to recognize the portfolio’s results of operations, also condensed into a single line itemlower-rated locations within our consolidated statementsprimary markets and had average revenues per apartment home significantly below those of operations, for periods subsequent to the transaction. In January 2016, we received final payment on the first of the two seller-financed notes and the buyer was in compliance with the terms of the second seller-financed note.
At December 31, 2015, the Napico portfolio consisted of 14 partnerships that held investments in 12 apartment communities that were consolidated and 44 apartment communities that were accounted for under the equity or cost methods of accounting. The portfolio’s assets and liabilities included in other assets in our consolidated balance sheets are summarized below (in thousands).

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 December 31,
 2015 2014
Real estate, net$108,119
 $117,851
Cash and cash equivalents33,725
 23,133
Investment in unconsolidated real estate partnerships and other assets14,545
 20,151
Total assets$156,389
 $161,135
    
Total indebtedness$148,761
 $113,641
Accrued and other liabilities7,055
 4,417
Total liabilities155,816
 118,058
    
Noncontrolling interests in consolidated real estate partnerships(111) 44,106
Equity attributable to Aimco and the Aimco Operating Partnership684
 (1,029)
Total liabilities and equity$156,389
 $161,135
retained portfolio.
During the year ended December 31, 2015, Napico2018, we sold several consolidated apartment communities, resultingour interests in the reductionentities owning the La Jolla Cove property in settlement of real estate,legal actions filed in 2014 by a group of disappointed buyers who had hoped to acquire the property. We provided seller financing with a stated value of $48.6 million and Napico refinanced several apartment communities, resulting in a significant increase in indebtedness and a corresponding reduction in noncontrolling interests in consolidated real estate partnerships, following the distributionreceived net cash proceeds of approximately $38.9$5.0 million of such proceeds.in the sale.
Summarized information regardingDuring the Napico portfolio’s results of operations, including any expense we recognize under the profit sharing method, is shown below in thousands. The net (loss) income related to Napico (before noncontrolling interests) is included in other, net in our consolidated statements of operations.
 Year Ended December 31,
 2015 2014 2013
Revenues$26,203
 $27,701
 $23,711
Expenses(21,520) (21,472) (21,188)
Equity in earnings or loss of unconsolidated entities, gains or losses on dispositions and other, net(4,495) (6,996) (748)
Net income (loss) related to legacy asset management business188
 (767) 1,775
Income tax (expense) benefit associated with legacy asset management business(1,967) 3
 (639)
Noncontrolling interests in consolidated real estate partnerships5,420
 (403) 21,370
Net income (loss) of legacy asset management business attributable to Aimco and the Aimco Operating Partnership$3,641
 $(1,167) $22,506
The results of operations for the consolidated apartment communities sold by the owner of this portfolio through December 31, 2013, are presented within income from discontinued operations in our consolidated statement of operations for the yearyears ended December 31, 2013,2017 and are excluded from2016, the summary above. Revenues increased during the year ended December 31, 2014, as comparedconsolidated partnerships served by our Asset Management business sold a total of three apartment communities for gross proceeds of $10.9 million and $27.5 million, respectively, and resulting in gains on dispositions of $2.6 million and $16.5 million, respectively.
In addition to the year ended December 31, 2013, due to an adjustment to increase subsidized rents to reflect current market rates for one of the apartment communities we sold during the periods presented, from time to time we may be marketing for sale certain apartment communities that are inconsistent with our long-term investment strategy. At the end of each reporting period, we evaluate whether such communities meet the criteria to be classified as held for sale. As of December 31, 2018, we had two apartment communities with 782 apartment homes in this portfolio.
Based on our limited economic ownership in this portfolio, most of the assets and liabilities are allocated to noncontrolling interests and do not significantly affect our consolidated equity or partners’ capital. Additionally, the operating results of this portfolio generally have an insignificant effect on the amounts of income or loss attributable us, except as it relates to the consolidated partnerships within thisReal Estate portfolio that sell their final investmentswere classified as held for sale. In January 2019, we sold the apartment communities for a gain on disposition of $87.5 million, net of tax, and commence dissolution, which resultsgross proceeds of $141.2 million, resulting in the derecognition of all remaining noncontrolling interest balances associated with these partnerships. During 2013, noncontrolling interests in consolidated real estate partnerships reflects a benefit of $20.6$114.9 million to Aimco and the Aimco Operating Partnership’s share of net income for the derecognition of such noncontrolling interest balances.proceeds to Aimco.
We consolidated the majority of these entities in connection with our adoption of a new accounting principle in 2010, and at that time recognized a large cumulative effect of a change in accounting principle charge to our equity and partners’ capital. This adjustment represented the cumulative charges to earnings we would have recognized for any distributions or losses allocable to noncontrolling interests in excess of the carrying amount of the associated noncontrolling interest balances had we consolidated these entities from the period of our initial involvement.

F-25


Income or loss attributable to these noncontrolling interests will continue to be recognized commensurate with the recognition of the results of operations of the portfolio. If payment is received on the remaining seller-financed note or we otherwise meet the requirements to recognize the sale for accounting purposes, we expect to recognize a gain attributable to Aimco and the Aimco Operating Partnership.
Note 4 — Investments in Unconsolidated Real Estate Partnerships
At December 31, 2015, 2014 and 2013, we owned general and limited partner interests in unconsolidated real estate partnerships that owned 11, 11 and 20 apartment communities, respectively. At December 31, 2015, our ownership interests in these unconsolidated real estate partnerships ranged from 40% to 67%.
The following table provides selected combined financial information for the unconsolidated real estate partnerships in which we had investments accounted for under the equity method as of and for the years ended December 31, 2015, 2014 and 2013 (in thousands):
 2015 2014 2013
Total assets$84,796
 $85,492
 $93,242
Total liabilities52,685
 54,472
 64,859
Partners’ capital32,111
 31,020
 28,383
Rental and other property revenues12,193
 12,978
 16,268
Property operating expenses(5,473) (6,233) (8,470)
Depreciation and amortization(1,841) (3,081) (3,300)
Interest expense(2,520) (2,785) (4,185)
Gain on sale and impairment losses, net
 
 36,212
Net income1,720
 688
 35,909
At December 31, 2015, our aggregate recorded investment in unconsolidated partnerships of $15.4 million was less than our share of the partners' capital or deficit by approximately $0.8 million. At December 31, 2014, our aggregate recorded investment in unconsolidated partnerships of $16.0 million exceeded our share of the partners’ capital or deficit recognized in the underlying partnerships’ financial statements by approximately $0.4 million.
Note 5 — Non-Recourse Property Debt and Credit Agreement
Non-Recourse Property Debt (Real Estate Portfolio)
We finance our apartment communities in our Real Estate portfolio primarily using property-level, non-recourse, long-dated, fixed-rate, borrowings, each of which is collateralized by a single apartment community and is non-recourse to us.amortizing debt. The following table summarizes ournon-recourse property debt related to assets classified as held for use at December 31, 20152018 and 2014 (dollars in2017 (in thousands):
 Principal Outstanding
 2015 2014
Fixed rate property debt$3,761,238
 $3,902,642
Variable rate property debt84,922
 120,167
Total property debt$3,846,160
 $4,022,809
 2018 2017
Fixed-rate property debt$3,676,882
 $3,480,378
Variable-rate property debt260,118
 82,663
Debt issue costs, net of accumulated amortization(21,695) (17,932)
Non-recourse property debt, net$3,915,305
 $3,545,109
Fixed rateFixed-rate property debt matures at various dates through February 2061,January 2055, and has interest rates that range from 2.28%2.73% to 8.50%7.14%, with a weighted average interest rate of 5.10%4.22%. Principal and interest on fixed-rate debt are generally payable monthly or in monthly interest-only payments with balloon payments due at maturity. At December 31, 2015,2018, each of our fixed ratethe fixed-rate loans payable related to apartment communities classified as held for use were secured by one of 15382 apartment communities that had an aggregate grossnet book value of $6.7$4.2 billion.
Variable rateVariable-rate property debt matures at various dates through July 2033, and hashad interest rates that rangeranged from 0.05%3.55% to 1.86%3.67%, as of December 31, 2018, with a weighted average interest rate of 1.55%.3.61% at December 31, 2018. Principal and interest on thisvariable-rate debt isare generally payable in semi-annual installments with balloon payments due at maturity. AtAs of December 31, 2015,2018, our variable ratevariable-rate property debt related to apartment communities classified as held for use were each secured by one of foureight apartment communities that had an aggregate grossnet book value of $165.8$239.5 million.


F-26


OurThese non-recourse property debt instruments contain covenants common to the type of borrowing, and at December 31, 2015,2018, we were in compliance with all such covenants.

As of December 31, 2015,2018, the scheduled principal amortization and maturity payments for ourthe non-recourse property debt related to apartment communities classified as held for use arewere as follows (in thousands):
Amortization Maturities TotalAmortization Maturities
2016$76,798
 $249,175
 $325,973
201775,472
 325,853
 401,325
201873,698
 207,616
 281,314
201968,418
 518,323
 586,741
$77,791
 $168,554
202061,731
 303,741
 365,472
79,592
 78,930
2021 (1)69,995
 611,039
202264,991
 283,629
202355,450
 337,871
Thereafter    1,885,335
  2,109,158
    $3,846,160
Total  $3,937,000
As of December 31, 2015, our unencumbered pool included 25 consolidated apartment communities and had an estimated fair value of $1.8 billion. At December 31, 2015, we also had two recently acquired consolidated apartment communities which we anticipate encumbering but for which financing was not yet in place.
(1)Pursuant to the terms of our loan agreements, we may prepay in 2020 $246.5 million of loans maturing in 2021, without penalty.
Credit AgreementFacility
We have a Senior Secured Credit Agreementcredit facility with a syndicate of financial institutions, which we refer to as the Credit Agreement.institutions. Our Credit Agreementcredit facility provides for $600.0$800.0 million of revolving loan commitments. BorrowingsAs of December 31, 2018 and 2017, we had $160.4 million and $67.2 million, respectively, of outstanding borrowings under our revolving credit facility. The interest rate on our outstanding borrowings was 3.93% and 3.26% at December 31, 2018 and 2017, respectively. As of December 31, 2018, after outstanding borrowings and $7.1 million of undrawn letters of credit backed by the Credit Agreement, our available borrowing capacity was $632.5 million. During the year ended December 31, 2018, we repaid the $250.0 million term loan in full.
Borrowings against the revolving loan commitments bear interest at a rate set forth on a pricing grid, which rate varies based on our leverage (either at LIBOR,credit rating as assigned by specified rating agencies (LIBOR plus 1.35%1.20%, or, at our option, Primea base rate plus 0.35%0.20% at December 31, 2015)2018). The Credit Agreementcredit facility matures in September 2017, and may be extended for an additional one-year period, subject to certain conditions.on January 22, 2022. The Credit Agreementcredit facility provides that we may make distributions to our investors during any four consecutive quarters in an aggregate amount that does not exceed the greater of 95% of our Funds From Operations for such period, subject to certain non-cash adjustments, or such amount as may be necessary to maintain Aimco’s REIT status.
Note 5 — Commitments and Contingencies
Commitments
In connection with our redevelopment, development and capital improvement activities, we have entered into various construction-related contracts and we have made commitments to complete redevelopment of certain apartment communities, pursuant to financing or other arrangements. As of December 31, 2015,2018, our commitments related to these capital activities totaled approximately $207.0 million, most of which we expect to incur during the next 12 months.
We enter into certain commitments for future purchases of goods and services in connection with the operations of our apartment communities. Those commitments generally have terms of one year or less and reflect expenditure levels comparable to our historical expenditures.
Legal Matters
In addition to the matters described below, we are a party to various legal actions and administrative proceedings arising in the ordinary course of business, some of which are covered by our general liability insurance program, and none of which we expect to have a material adverse effect on our consolidated financial condition, results of operations or cash flows.
Environmental
Various federal, state and local laws subject apartment community owners or operators to liability for management, and the costs of removal or remediation, of certain potentially hazardous materials that may be present in the land or buildings of an apartment community. Such laws often impose liability without regard to fault or whether the owner or operator knew of, or was responsible for, the presence of such materials. The presence of, or the failure to manage or remediate properly, these materials may adversely affect occupancy at such apartment communities as well as the ability to sell or finance such apartment communities. In addition, governmental agencies may bring claims for costs associated with investigation and remediation actions. Moreover, private plaintiffs may potentially make claims for investigation and remediation costs they incur or for personal injury, disease, disability or other infirmities related to the alleged presence of hazardous materials. In addition to potential environmental liabilities

or costs associated with our current apartment communities, we may also be responsible for such liabilities or costs associated with communities we acquire or manage in the future, or apartment communities we no longer own or operate.
We are engaged in discussions with the Environmental Protection Agency, or EPA, and the Indiana Department of Environmental Management, or IDEM, regarding contaminated groundwater in a residential area near an Indiana apartment community that has not been owned by us since 2008. The contamination allegedly derives from a dry cleaner that operated on our former property, prior to our ownership. We undertook a voluntary remediation of the dry cleaner contamination under IDEM’s oversight. In 2016, EPA listed our former community and a number of residential communities in the vicinity on the National Priorities List, or NPL (i.e. as a Superfund site). In May 2018, we prevailed on our federal judicial appeal vacating the Superfund listing. We continue to work with EPA and IDEM to identify options for clean-up of the site. Although the outcome of these processes are uncertain, we do not expect their resolution to have a material adverse effect on our consolidated financial condition, results of operations or cash flows.
We also have been contacted by regulators and the current owner of a property in Lake Tahoe, California, regarding environmental issues allegedly stemming from the historic operation of a dry cleaner. An entity owned by us was the former general partner of a now-dissolved partnership that previously owned a site that was used for dry cleaning. That entity and the current property owner have been remediating the dry cleaner site since 2009, under the oversight of the Lahontan Regional Water Quality Control Board, or Lahontan. In May 2017, Lahontan issued a final cleanup and abatement order that names four potentially-responsible parties, acknowledges that there may be additional responsible parties, and requires the named parties to perform additional groundwater investigation and corrective actions with respect to onsite and offsite contamination. We are appealing the final order while simultaneously complying with it. Although the outcome of this process is uncertain, we do not expect its resolution to have a material adverse effect on our consolidated financial condition, results of operations or cash flows.
We have determined that our legal obligations to remove or remediate certain potentially hazardous materials may be conditional asset retirement obligations, as defined in GAAP. Except in limited circumstances where the asset retirement activities are expected to be performed in connection with a planned construction project or apartment community casualty, we believe that the fair value of our asset retirement obligations cannot be reasonably estimated due to significant uncertainties in the timing and manner of settlement of those obligations. Asset retirement obligations that are reasonably estimable as of December 31, 2018, are immaterial to our consolidated financial condition, results of operations and cash flows.
Operating Leases
We are obligated under non-cancelable operating leases for office space. We are also obligated under non-cancelable operating leases for the ground under certain of our apartment communities with remaining terms ranging from 52 years to 99 years. Minimum annual rental payments under operating leases are as follows (in thousands):
 Office Lease Obligations Ground Lease Obligations Total Operating Lease Obligations
2019$2,237
 $2,114
 $4,351
20202,821
 2,350
 5,171
20212,719
 2,439
 5,158
20222,582
 2,492
 5,074
20231,871
 2,492
 4,363
Thereafter10,644
 422,169
 432,813
Total$22,874
 $434,056
 $456,930
Substantially all of the office space subject to the operating leases in the table above is for the use of our corporate offices and area operations. Rent expense is generally recognized on a straight-line basis and totaled $2.8 million, $3.0 million and $3.3 million for the years ended December 31, 2018, 2017 and 2016, respectively. Rent expense recognized for the ground leases totaled $2.3 million, $1.8 million and $1.7 million for the years ended December 31, 2018, 2017 and 2016, respectively, and is included within interest expense in the accompanying statements of operations.

Note 6 — Aimco Equity
Preferred Stock
At December 31, 2018 and 2017, Aimco had $27.0a single class of perpetual preferred stock outstanding, its Class A Cumulative Preferred Stock, with 5,000,000 shares authorized, issued and outstanding and with a balance of $125.0 million as of outstanding borrowings underDecember 31, 2018 and 2017.
Aimco’s Class A Preferred Stock has a $0.01 per share par value, is senior to Aimco’s Common Stock, has a liquidation preference per share of $25.00 and is redeemable at our Credit Agreement,option on or after May 17, 2019. The holders of Preferred Stock are generally not entitled to vote on matters submitted to stockholders. Dividends at an annual rate of 6.88% are subject to declaration by Aimco’s Board of Directors and we hadaccrue if not declared.
During the capacity to borrow $536.6 million, netyear ended December 31, 2016, Aimco redeemed all of the outstanding borrowingsshares of its Class Z Cumulative Preferred Stock at a redemption value of $34.8 million. We reflected the $0.7 million excess of the redemption value over the carrying amount and $36.4$1.3 million of previously deferred issuance costs as an adjustment of net income attributable to preferred stockholders for undrawn lettersthe year ended December 31, 2016.
In connection with the redemption of credit backedAimco preferred stock, the Aimco Operating Partnership redeemed from Aimco a number of Partnership Preferred Units equal to the number of shares redeemed or repurchased by Aimco.
Common Stock
During the years ended December 31, 2018, 2017 and 2016, Aimco declared dividends per common share of $1.52, $1.44 and $1.32, respectively.
On February 3, 2019, Aimco’s Board of Directors authorized a reverse stock split, in which every 1.03119 Aimco common share will be combined into one Aimco common share, effective at the close of business on February 20, 2019. On the same date, the Board of Directors also declared a special dividend on the Aimco common stock that consists of $67.1 million in cash and 4.5 million shares of Aimco common stock. The special dividend will be payable on March 22, 2019, to stockholders of record as of February 22, 2019. The special dividend amount includes the regular quarterly cash dividend, which for 2019 is expected to be $0.39 per share. Stockholders will have the opportunity to elect to receive the special dividend in the form of all cash or all stock, subject to proration if either option is oversubscribed. The reverse split was authorized in order to neutralize the dilutive impact of the stock issued in the special dividend. As a result, total shares outstanding following completion of both the special dividend and the reverse stock split are expected to be unchanged from the total shares outstanding immediately prior to the transactions. Some stockholders may have more Aimco shares and some may have fewer based on their individual elections.
Pro forma Earnings per Share (unaudited)
In financial statements issued after the effective date of the reverse stock split, we are required to retroactively recognize the reverse stock split in the calculation of basic and diluted earnings per share. The shares issued in connection with the special dividend will be included in the calculation of basic and diluted earnings per share on a prospective basis, and are therefore not included in the pro forma amounts disclosed below. If the reverse stock split had been effective prior to issuance of these financial statements, basic and diluted weighted average shares outstanding and earnings per share for the years ending December 31, 2018, 2017 and 2016 would have been (shares in thousands):
 2018 2017 2016
Weighted average shares, basic151,152
 151,595
 151,282
Weighted average shares, diluted151,334
 152,060
 151,669
Basic earnings per share$4.34
 $2.02
 $2.76
Diluted earnings per share$4.34
 $2.02
 $2.75
Registration Statements
Aimco and the Aimco Operating Partnership have a shelf registration statement that provides for the issuance of equity and debt securities by Aimco and debt securities by the Credit Agreement. The interest rate on our outstanding borrowings was 1.59% atAimco Operating Partnership.

Note 7 — Partners’ Capital
Partnership Preferred Units Owned by Aimco
At December 31, 2015.2018 and 2017, the Aimco Operating Partnership had outstanding preferred units in classes and amounts similar to Aimco’s Preferred Stock described in Note 6, or Partnership Preferred Units. All of these Partnership Preferred Units were owned by Aimco during the periods presented.
The Partnership Preferred Units are senior to the Aimco Operating Partnership’s common partnership units. The Partnership Preferred Units do not have voting rights, except the right to approve certain changes to the Aimco Operating Partnership’s Partnership Agreement that would adversely affect holders of such class of units. Distributions on Partnership Preferred Units are subject to being declared by the General Partner. The Partnership Preferred Units are redeemable by the Aimco Operating Partnership only in connection with a concurrent redemption by Aimco of the corresponding Aimco Preferred Stock held by unrelated parties.
As discussed in Note 6, during the year ended December 31, 2016, Aimco redeemed its Class Z Cumulative Preferred Stock. In connection with this redemption, the Aimco Operating Partnership redeemed from Aimco a corresponding number of Partnership Preferred Units.
Redeemable Preferred OP Units
In addition to the Partnership Preferred Units owned by Aimco, the Aimco Operating Partnership has outstanding various classes of redeemable Partnership Preferred Units owned by third parties, which we refer to as preferred OP Units. As of December 31, 2014,2018 and 2017, the Aimco Operating Partnership had the following classes of preferred OP Units (stated at their redemption values, in thousands, except unit and per unit data):
 Distributions per Annum Units Issued and Outstanding Redemption Values
Class of Preferred UnitsPercent Per Unit 2018 2017 2018 2017
Class One8.75% $8.00
 90,000
 90,000
 $8,229
 $8,229
Class Two1.92% $0.48
 14,240
 17,750
 356
 444
Class Three7.88% $1.97
 1,338,524
 1,338,524
 33,463
 33,462
Class Four8.00% $2.00
 644,954
 644,954
 16,124
 16,124
Class Six8.50% $2.13
 773,693
 780,036
 19,342
 19,501
Class Seven7.87% $1.97
 27,960
 27,960
 699
 699
Class Nine6.00% $1.50
 243,112
 243,112
 6,078
 6,078
Class Ten6.00% $1.50
 680,000
 680,000
 17,000
 17,000
Total    3,812,483
 3,822,336
 $101,291
 $101,537
Each class of preferred OP Units is currently redeemable at the holders’ option. The Aimco Operating Partnership, at its sole discretion, may settle such redemption requests in cash or cause Aimco to issue shares of its Common Stock with a value equal to the redemption price. In the event the Aimco Operating Partnership requires Aimco to issue shares of Common Stock to settle a redemption request, the Aimco Operating Partnership would issue to Aimco a corresponding number of common partnership units. The Aimco Operating Partnership has a redemption policy that requires cash settlement of redemption requests for the preferred OP Units, subject to limited exceptions. Subject to certain conditions, the Class Four and Class Six preferred OP Units may be converted into common OP Units.
These redeemable units are classified within temporary equity in Aimco’s consolidated balance sheets and within temporary capital in the Aimco Operating Partnership’s consolidated balance sheets.
During the years ended December 31, 2018, 2017 and 2016, approximately 10,000, 67,000 and 69,000 preferred OP Units, respectively, were redeemed in exchange for cash, and no preferred OP Units were redeemed in exchange for shares of Aimco Common Stock.
The Class Ten preferred OP Units were issued as partial consideration for an acquisition during the year ended December 31, 2016.

The following table presents a reconciliation of the Aimco Operating Partnership’s preferred OP Units during the years ended December 31, 2018, 2017 and 2016 (in thousands):
 2018 2017 2016
Balance at January 1$101,537
 $103,201
 $87,926
Preferred distributions(7,740) (7,764) (7,239)
Redemption of preferred units and other(246) (1,664) (1,725)
Issuance of preferred units
 
 17,000
Net income7,740
 7,764
 7,239
Balance at December 31$101,291
 $101,537
 $103,201
Common Partnership Units
In the Aimco Operating Partnership’s consolidated balance sheets, the common partnership units held by Aimco are classified within Partners’ Capital as General Partner and Special Limited Partner capital and the common OP Units are classified within Limited Partners’ capital. In Aimco’s consolidated balance sheets, the common OP Units are classified within permanent equity as common noncontrolling interests in the Aimco Operating Partnership.
Common partnership units held by Aimco are not redeemable whereas common OP Units are redeemable at the holders’ option, subject to certain restrictions, on the basis of one common OP Unit for either one share of Common Stock or cash equal to the fair value of a share of Common Stock at the time of redemption. Aimco has the option to deliver shares of Common Stock in exchange for all or any portion of the common OP Units tendered for redemption. When a limited partner redeems a common OP Unit for Common Stock, Limited Partners’ capital is reduced and the General Partner and Special Limited Partners’ capital is increased.
During the years ended December 31, 2018, 2017 and 2016, approximately 224,000, 268,000 and 248,000 common OP Units, respectively, were redeemed in exchange for cash, and no common OP Units were redeemed in exchange for shares of Common Stock.
The holders of the common OP Units receive distributions, prorated from the date of issuance, in an amount equivalent to the dividends paid to holders of Common Stock. During the years ended December 31, 2018, 2017 and 2016, the Aimco Operating Partnership declared distributions per common unit of $1.52, $1.44 and $1.32, respectively
On February 3, 2019, the Board of Directors of the Aimco Operating Partnership’s general partner authorized a reverse unit split in which every 1.03119 common partnership units will be combined into one common partnership unit. The reverse split is effective at the close of business on February 20, 2019, and corresponds to a similar split effected by Aimco with respect to its common shares at the same time. On the same date, the Board of Directors also declared a special distribution to the holders of Aimco Operating Partnership common partnership units that consists of $71.5 million in cash and 4.8 million common partnership units. The special distribution will be payable on March 22, 2019, to unitholders of record as of February 22, 2019. The special distribution also corresponds to a similar special dividend paid at the same time to holders of Aimco common shares. The reverse split was authorized in order to neutralize the dilutive impact of the units issued in the special distribution. As a result, total common partnership units outstanding following completion of both the special distribution and the reverse unit split are expected to be unchanged from the total common partnership units outstanding immediately prior to the transactions.
Pro forma Earnings per Common Unit (Unaudited)
In financial statements issued after the effective date of the reverse unit split, we are required to retroactively recognize the reverse unit split in the calculation of basic and diluted earnings per unit. The units issued in connection with the special distribution will be included in the calculation of basic and diluted earnings per unit on a prospective basis, and are therefore not included in the pro forma amounts disclosed below. If the reverse unit split had been effective prior to issuance of these financial statements, basic and diluted weighted average units outstanding and earnings per unit for the years ending December 31, 2018, 2017 and 2016 would have been (units in thousands):
 2018 2017 2016
Weighted average units, basic158,890
 158,793
 158,808
Weighted average units, diluted159,073
 159,257
 159,194
Basic earnings per unit$4.35
 $2.02
 $2.76
Diluted earnings per unit$4.34
 $2.02
 $2.75

Note 8 — Share-Based Compensation
We have a stock award and incentive program to attract and retain officers and independent directors. As of December 31, 2018, approximately 4.7 million shares were available for issuance under our Amended and Restated 2015 Stock Award and Incentive Plan, or the 2015 Plan. The total number of shares available for issuance under this plan may be increased by an additional 0.3 million shares to the extent of any forfeiture, cancellation, exchange, surrender, termination or expiration of an award outstanding under our 2007 Stock Award and Incentive Plan. Awards under the 2015 Plan may be in the form of incentive stock options, non-qualified stock options and restricted stock, or other types of awards as authorized under the plan.
Our plans are administered by the Compensation and Human Resources Committee of Aimco’s Board of Directors. In the case of stock options, the exercise price of the options granted may not be less than the fair market value of a share of Common Stock at the date of grant.
Total compensation cost recognized for stock based awards was $9.7 million, $9.3 million and $8.6 million for the years ended December 31, 2018, 2017 and 2016, respectively. Of these amounts, $1.2 million, $1.4 million and $1.0 million, respectively, were capitalized. At December 31, 2018, total unvested compensation cost not yet recognized was $11.0 million. We expect to recognize this compensation over a weighted average period of approximately 1.6 years.
We have granted five different types of awards that are outstanding as of December 31, 2018. We have outstanding stock options and restricted stock awards that are subject to time-based vesting and require continuous employment, typically over a period of four years from the grant date, and we refer to these awards as Time-Based Stock Options and Time-Based Restricted Stock, respectively. We also have outstanding stock options, restricted stock awards and two forms of long-term incentive partnership units, or LTIP units, that vest conditioned on Aimco’s total shareholder return, or TSR, relative to the NAREIT Apartment Index (60% weighting) and the MSCI US REIT Index (40% weighting) over a forward-looking performance period of three years. We refer to these awards as TSR Stock Options, TSR Restricted Stock, TSR LTIP I units, and TSR LTIP II units. Vested LTIP II units may be converted at the holders option to LTIP Units for a strike price over a term of ten years. Earned TSR-based awards, if any, will vest 50% on each of the third anniversary and fourth anniversary of the grant date, based on continued employment. The term of Time-Based Stock Options and TSR Stock Options is generally ten years from the date of grant.
We recognize compensation cost associated with Time-Based awards ratably over the requisite service periods, which are typically four years. We recognize compensation cost related to the TSR-based awards, which have graded vesting periods, over the requisite service period for each separate vesting tranche of the award, commencing on the grant date. The value of the TSR-based awards take into consideration the probability that the market condition will be achieved; therefore previously recorded compensation cost is not adjusted in the event that the market condition is not achieved and awards do not vest.
Stock Options
During the years ended December 31, 2018, 2017 and 2016, we granted TSR Stock Options.
The following table summarizes activity for our outstanding stock options, for the years ended December 31, 2018, 2017 and 2016 (options in thousands):
 2018 2017 2016
 Number of Options Weighted
Average
Exercise
Price
 Number of Options Weighted
Average
Exercise
Price
 Number of Options Weighted
Average
Exercise
Price
Outstanding at beginning of year648
 $40.08
 675
 $29.55
 1,394
 $30.85
Granted
 
 184
 44.07
 216
 38.73
Exercised(2) 28.33
 (211) 9.90
 (934) 33.61
Forfeited
 
 
 
 (1) 29.11
Outstanding at end of year646
 $40.12
 648
 $40.08
 675
 $29.55
Exercisable at end of year186
 $38.18
 128
 $37.59
 280
 $16.38
The intrinsic value of a stock option represents the amount by which the current price of the underlying stock exceeds the exercise price of the option. As of December 31, 2018, options outstanding had an aggregate intrinsic value of $2.5 million and a weighted average remaining contractual term of 7.0 years. Options exercisable at December 31, 2018, had an aggregate intrinsic value of $1.1 million and a weighted average remaining contractual term of 5.9 years. The intrinsic value of stock options exercised during the years ended December 31, 2018, 2017 and 2016, was $32 thousand, $7.1 million and $11.1 million, respectively.

The weighted average grant date fair value of stock options granted during the years ended 2017 and 2016 was $11.39 and $9.94 per option, respectively.
Time-Based Restricted Stock Awards
The following table summarizes activity for Time-Based Restricted Stock awards for the years ended December 31, 2018, 2017 and 2016 (shares in thousands):
 2018 2017 2016
 Number of Shares Weighted
Average
Grant-Date
Fair Value
 Number of Shares Weighted
Average
Grant-Date
Fair Value
 Number of Shares Weighted
Average
Grant-Date
Fair Value
Unvested at beginning of year160
 $37.63
 249
 $33.61
 339
 $29.96
Granted51
 40.01
 45
 44.07
 91
 40.03
Vested(86) 34.42
 (134) 32.35
 (181) 29.99
Unvested at end of year125
 $40.82
 160
 $37.63
 249
 $33.61
The aggregate fair value of shares that vested during the years ended December 31, 2018, 2017 and 2016 was $8.4 million, $6.0 million and $7.0 million, respectively.
TSR Restricted Stock Awards
The following table summarizes activity for TSR Restricted Stock awards for the years ended December 31, 2018, 2017 and 2016 (shares in thousands):
 2018 2017 2016
 Number of Shares Weighted
Average
Grant-Date
Fair Value
 Number of Shares Weighted
Average
Grant-Date
Fair Value
 Number of Shares Weighted
Average
Grant-Date
Fair Value
Unvested at beginning of year253
 $40.70
 214
 $39.66
 123
 $39.72
Granted45
 41.71
 39
 46.39
 91
 39.59
Vested(123) 39.72
 
 
 
 
Unvested at end of year175
 $41.65
 253
 $40.70
 214
 $39.66
TSR LTIP I Units
The following table summarizes activity for TSR LTIP I units for the years ended December 31, 2018 and 2017 (units in thousands):
 2018 2017
 Number of Units Weighted
Average
Grant-Date
Fair Value
 Number of Units Weighted
Average
Grant-Date
Fair Value
Unvested at beginning of year45
 $46.21
 
 $
Granted48
 41.48
 45
 46.21
Unvested at end of year93
 $43.78
 45
 $46.21

TSR LTIP II Units
The following table summarizes activity for TSR LTIP II units for the years ended December 31, 2018 and 2017 (numbers of units in thousands):
 2018
 Number of Units Weighted
Average
Grant-Date
Fair Value
Unvested at beginning of year
 $
Granted243
 41.84
Unvested at end of year243
 $41.84
Determination of Grant-Date Fair Value of Awards
We estimated the fair value of TSR-based awards granted in 2018, 2017 and 2016 using a Monte Carlo model using the assumptions set forth in the table below.
The risk-free interest rate reflects the annualized yield of a zero coupon U.S. Treasury security with a term equal to the expected term of the option. The expected dividend yield reflects expectations regarding cash dividend amounts per share paid on Aimco’s Common Stock during the expected term of the awards. Expected volatility reflects an average of the historical volatility of Aimco’s Common Stock during the historical period commensurate with the expected term of the options that ended on the date of grant, and the implied volatility is calculated from observed call option contracts closest to the expected term. The derived vesting period of TSR Restricted Stock and TSR LTIP I units was determined based on the graded vesting terms. The expected term of the TSR-options and TSR LTIP II units was based on historical option exercises and post-vesting terminations. The midpoints of our valuation assumptions for the 2018, 2017 and 2016 grants were as follows:
 2018 2017 2016
Grant date market value of a common share$40.95
 $44.07

$38.73
Risk-free interest rate2.32% 1.57%
1.15%
Dividend yield3.52% 3.27%
3.41%
Expected volatility18.02% 21.33%
21.24%
Derived vesting period of TSR Restricted Stock and TSR LTIP I units3.4 years
 3.4 years

3.4 years
Weighted average expected term of TSR Stock Options and LTIP II units5.6 years
 5.8 years
 5.8 years
The grant date fair value for the Time-Based Restricted Stock awards reflects the closing price of a share of Aimco common stock on the grant date.

Note 9 — Income Taxes
Deferred income taxes reflect the net effects of temporary differences between the carrying amounts of assets and liabilities of the TRS entities for financial reporting purposes and the amounts used for income tax purposes. Significant components of our deferred tax liabilities and assets are as follows (in thousands):
 December 31,
 2018 2017
Deferred tax liabilities:   
Real estate and real estate partnership basis differences$12,058
 $32,032
Deferred tax assets:   
Net operating, capital and other loss carryforwards$7,022
 $9,523
Accruals and expenses7,432
 6,575
Tax credit carryforwards67,530
 73,450
Management contracts and other2,064
 200
Total deferred tax assets84,048
 89,748
Valuation allowance(4,930) (25,489)
Net deferred tax assets$67,060
 $32,227
In December 2017, the U.S. Congress passed the Tax Cuts and Jobs Act, or the 2017 Act, which is effective for years beginning with 2018. The 2017 Act provided for a reduction in the federal income tax rate. In accordance with GAAP, we revalued our deferred tax assets and liabilities as of December 31, 2017. We finalized our accounting for the tax effects of enactment of the 2017 Act during the year ended December 31, 2018, resulting in our recognition of a cumulative net tax benefit of $15.6 million over the two years.
At December 31, 2018, we had $112.3federal and state net operating loss carryforwards, or NOLs, for which the deferred tax asset was approximately $7.0 million, before a valuation allowance of outstanding borrowings$4.9 million. The NOLs expire in years 2019 to 2034. Subject to certain separate return limitations, we may use these NOLs to offset a portion of state taxable income generated by our TRS entities.
As of December 31, 2018, we had low-income housing and rehabilitation tax credit carryforwards and corresponding deferred tax assets of approximately $67.5 million for income tax purposes that expire in years 2034 to 2038. In light of the lower federal tax rate under the 2017 Act, our Credit Agreement,TRS entities must generate more taxable income in future years to utilize tax credit carryforwards, which are recorded as deferred tax assets. As a result, during the year ended December 31, 2017, we recognized a partial valuation allowance of $15.4 million against the deferred tax assets associated with low-income housing and rehabilitation tax credit carryforwards. Due to the sale of our Asset Management business, discussed further in Note 3, during the year ended December 31, 2018, we reversed the remaining valuation allowance recognized in 2017 against our deferred tax benefits that we now expect to utilize.
A reconciliation of the beginning and ending balance of our unrecognized tax benefits is presented below (in thousands):
 2018 2017 2016
Balance at January 1$2,476
 $2,286
 $2,897
Additions (reductions) based on tax positions related to prior years142
 190
 (611)
Balance at December 31$2,618
 $2,476
 $2,286
Because the statute of limitations has not yet elapsed, our United States federal income tax returns for the year ended December 31, 2014 and subsequent years and certain of our State income tax returns for the year ended December 31, 2014 and subsequent years are currently subject to examination by the IRS or other taxing authorities. If recognized, the unrecognized benefit would affect the effective rate.
In 2014, the IRS initiated an audit of the Aimco Operating Partnership’s 2011 and 2012 tax years. This audit remains in process as of December 31, 2018. We do not believe the audit will have any material effect on our unrecognized tax benefits, financial condition or results of operations.
Our policy is to include any interest and penalties related to income taxes within the income tax line item in our consolidated statements of operations.

In accordance with the accounting requirements for stock-based compensation, we may recognize tax benefits in connection with the exercise of stock options by employees of our TRS entities and the interestvesting of restricted stock awards. We recognize the tax effects related to stock based compensation through earnings in the period the compensation was recognized.
Significant components of the income tax benefit or expense are as follows and are classified within income tax benefit in income before gain on dispositions and gain on dispositions of real estate, net of tax, in our consolidated statements of operations for the years ended December 31, 2018, 2017 and 2016 (in thousands):
 2018 2017 2016
Current:     
Federal$11,269
 $(938) $5,038
State10,537
 525
 2,916
Total current21,806
 (413) 7,954
      
Deferred:     
Federal(29,243) (10,908) (26,173)
State(5,590) (3,621) (623)
Revaluation of deferred taxes due to change in tax rate
 (15,894) 
Total deferred(34,833) (30,423) (26,796)
Total benefit$(13,027) $(30,836) $(18,842)
Consolidated income or loss subject to tax consists of pretax income or loss of our TRS entities and income and gains retained by the REIT. For the years ended December 31, 2018, 2017 and 2016, we had consolidated net income subject to tax of $158.6 million, net loss subject to tax of $55.6 million and net income subject to tax of $109.3 million, respectively.
The reconciliation of income tax attributable to operations computed at the United States statutory rate on our outstanding borrowings was 2.08%. The proceedsto income tax benefit is shown below (dollars in thousands):
 2018 2017 2016
 Amount Percent Amount Percent Amount Percent
Tax provision (benefit) at United States statutory rates on consolidated income or loss subject to tax$33,296
 21.0 % $(19,459) 35.0 % $38,257
 35.0 %
State income tax expense, net of federal tax (benefit) expense12,252
 7.7 % (1,769) 3.2 % 7,152
 6.5 %
Establishment of deferred tax asset related to partnership basis difference (1)
  % (3,501) 6.3 % 
  %
Effect of permanent differences302
 0.2 % (1,629) 2.9 % (132) (0.1)%
Tax effect of intercompany transactions (2)(33,250) (21.0)% 
  % (47,369) (43.3)%
Tax credits(6,897)
(4.4)% (9,607) 17.3 % (16,750) (15.3)%
Tax reform revaluation (3)288

0.2 % (15,894) 28.6 % 
  %
(Decrease) increase in valuation allowance (4)(20,434)
(12.9)% 21,023
 (37.8)% 
  %
Other1,416

0.9 % 
  % 
  %
Total income tax benefit$(13,027) (8.3)% $(30,836) 55.5 % $(18,842) (17.2)%
(1)2017 includes the establishment of a deferred tax asset related to partnership basis difference when it became apparent that it would reverse in the foreseeable future. This deferred tax asset was fully reserved in the valuation allowance described below as of December 31, 2017.
(2)2016 includes the effect of intercompany asset transfers between the Aimco Operating Partnership and TRS entities, for which tax was deferred and recognized as the assets affected GAAP income or loss, for example, through depreciation, impairment, or upon the sale of the asset to a third-party. Effective January 1, 2017, we adopted a new accounting standard applicable to intercompany asset transfers. As a result, the accumulated unrecognized deferred tax expense associated with historical intercompany transfers was recognized as a cumulative effect adjustment through retained earnings at that time. 2018 includes the tax benefit to establish the initial deferred tax asset from the intercompany transfer of a portion of the Asset Management business between the Aimco Operating Partnership and TRS entities.
(3)Reflects revaluation of deferred tax assets and liabilities using the TRS entities’ lower effective tax rates resulting from the 2017 Act. Accounting for the tax effects of enactment of the 2017 Act was finalized during the year ended December 31, 2018.

(4)2017 includes a $15.4 million valuation allowance against the deferred tax assets associated with rehabilitation tax credits due to the lower federal tax rate under the 2017 Act. This valuation allowance was reversed in 2018 as a result of the sale of our Asset Management business.
Income taxes paid totaled approximately $11.5 million, $7.4 million and $2.2 million in the years ended December 31, 2018, 2017 and 2016, respectively.
For income tax purposes, dividends paid to holders of revolving loans are generally usedCommon Stock primarily consist of ordinary income, capital gains, qualified dividends and unrecaptured Section 1250 gains, or a combination thereof. For the years ended December 31, 2018, 2017 and 2016, dividends per share held for working capital and other short-term purposes.the entire year were estimated to be taxable as follows:
 2018 2017 2016
 Amount Percentage Amount Percentage Amount Percentage
Ordinary income$0.51
 33.4% $0.75
 51.5% $0.45
 34.2%
Capital gains0.93
 61.2% 0.51
 35.7% 0.47
 35.4%
Qualified dividends
 % 0.02
 1.6% 0.13
 9.9%
Unrecaptured Section 1250 gain0.08
 5.4% 0.16
 11.2% 0.27
 20.5%
 $1.52
 100.0% $1.44
 100.0% $1.32
 100.0%
Note 610 — Earnings per Share/Unit
Aimco and the Aimco Operating Partnership calculate basic earnings per common share and basic earnings per common unit based on the weighted average number of shares of Common Stock and common partnership units and participating securities outstanding, and calculate diluted earnings per share and diluted earnings per unit taking into consideration dilutive common stock and common partnership unit equivalents and dilutive convertible securities outstanding during the period.
Our common stock equivalents and common partnership unit equivalents include options to purchase shares of Common Stock, which, if exercised, would result in Aimco’s issuance of additional shares and the Aimco Operating Partnership’s issuance to Aimco of additional common partnership units equal to the number of shares purchased under the options. These equivalents also include unvested TSR Restricted Stock awards that do not meet the definition of participating securities, which would result in the issuance of additional common shares and common partnership units equal to the number of shares that vest. The dilutive effect of these securities was 0.2 million shares or units, 0.5 million shares or units, and 0.4 million shares or units, respectively, for the years ended December 31, 2018, 2017 and 2016. Securities with dilutive effect are included in the denominator for calculating diluted earnings per share and unit during these periods. There were 0.3 million potential shares and 0.3 million potential units not dilutive and excluded from the denominator for calculating diluted earnings per share and per unit, respectively, for the year ended December 31, 2018. There were 0.2 million potential shares and 0.2 million potential units not dilutive and excluded from the denominator for calculating diluted earnings per share and per unit, respectively, for the years ended December 31, 2017 and 2016.
Our Time-Based Restricted Stock awards receive dividends similar to shares of Common Stock and common partnership units prior to vesting and our TSR LTIP I units and TSR LTIP II units receive distributions based on specified percentages of the distributions paid to common partnership units prior to vesting and conversion. These dividends and distributions are not forfeited in the event the awards do not vest. Therefore, the unvested restricted shares and units related to these awards are participating securities. The effect of participating securities is included in basic and diluted earnings per share and unit computations using the two-class method of allocating distributed and undistributed earnings when the two-class method is more dilutive than the treasury stock method. At December 31, 2018, 2017 and 2016, there were 0.3 million, 0.2 million and 0.2 million shares of unvested participating restricted securities, respectively. At December 31, 2018, 2017 and 2016, there were 0.6 million, 0.3 million and 0.2 million units of unvested participating restricted securities, respectively.
As discussed in Note 7, the Aimco Operating Partnership has various classes of preferred OP Units, which may be redeemed at the holders’ option. The Aimco Operating Partnership may redeem these units for cash, or at its option, shares of Common Stock. As of December 31, 2018, these preferred OP Units were potentially redeemable for approximately 2.3 million shares of Common Stock (based on the period end market price), or cash. The Aimco Operating Partnership has a redemption policy that requires cash settlement of redemption requests for the preferred OP Units, subject to limited exceptions. Accordingly, we have excluded these securities from earnings per share and unit computations for the periods presented above, and we expect to exclude them in future periods.

Note 11 — Fair Value Measurements
Recurring Fair Value MeasurementsLegal Matters
In addition to the matters described below, we are a party to various legal actions and administrative proceedings arising in the ordinary course of business, some of which are covered by our general liability insurance program, and none of which we expect to have a material adverse effect on our consolidated financial condition, results of operations or cash flows.
Environmental
Various federal, state and local laws subject apartment community owners or operators to liability for management, and the costs of removal or remediation, of certain potentially hazardous materials that may be present in the land or buildings of an apartment community. Such laws often impose liability without regard to fault or whether the owner or operator knew of, or was responsible for, the presence of such materials. The presence of, or the failure to manage or remediate properly, these materials may adversely affect occupancy at such apartment communities as well as the ability to sell or finance such apartment communities. In addition, governmental agencies may bring claims for costs associated with investigation and remediation actions. Moreover, private plaintiffs may potentially make claims for investigation and remediation costs they incur or for personal injury, disease, disability or other infirmities related to the alleged presence of hazardous materials. In addition to potential environmental liabilities

or costs associated with our current apartment communities, we may also be responsible for such liabilities or costs associated with communities we acquire or manage in the future, or apartment communities we no longer own or operate.
We measure atare engaged in discussions with the Environmental Protection Agency, or EPA, and the Indiana Department of Environmental Management, or IDEM, regarding contaminated groundwater in a residential area near an Indiana apartment community that has not been owned by us since 2008. The contamination allegedly derives from a dry cleaner that operated on our former property, prior to our ownership. We undertook a voluntary remediation of the dry cleaner contamination under IDEM’s oversight. In 2016, EPA listed our former community and a number of residential communities in the vicinity on the National Priorities List, or NPL (i.e. as a Superfund site). In May 2018, we prevailed on our federal judicial appeal vacating the Superfund listing. We continue to work with EPA and IDEM to identify options for clean-up of the site. Although the outcome of these processes are uncertain, we do not expect their resolution to have a material adverse effect on our consolidated financial condition, results of operations or cash flows.
We also have been contacted by regulators and the current owner of a property in Lake Tahoe, California, regarding environmental issues allegedly stemming from the historic operation of a dry cleaner. An entity owned by us was the former general partner of a now-dissolved partnership that previously owned a site that was used for dry cleaning. That entity and the current property owner have been remediating the dry cleaner site since 2009, under the oversight of the Lahontan Regional Water Quality Control Board, or Lahontan. In May 2017, Lahontan issued a final cleanup and abatement order that names four potentially-responsible parties, acknowledges that there may be additional responsible parties, and requires the named parties to perform additional groundwater investigation and corrective actions with respect to onsite and offsite contamination. We are appealing the final order while simultaneously complying with it. Although the outcome of this process is uncertain, we do not expect its resolution to have a material adverse effect on our consolidated financial condition, results of operations or cash flows.
We have determined that our legal obligations to remove or remediate certain potentially hazardous materials may be conditional asset retirement obligations, as defined in GAAP. Except in limited circumstances where the asset retirement activities are expected to be performed in connection with a planned construction project or apartment community casualty, we believe that the fair value on a recurring basisof our investmentasset retirement obligations cannot be reasonably estimated due to significant uncertainties in the securitization trusttiming and manner of settlement of those obligations. Asset retirement obligations that holdsare reasonably estimable as of December 31, 2018, are immaterial to our consolidated financial condition, results of operations and cash flows.
Operating Leases
We are obligated under non-cancelable operating leases for office space. We are also obligated under non-cancelable operating leases for the ground under certain of our propertyapartment communities with remaining terms ranging from 52 years to 99 years. Minimum annual rental payments under operating leases are as follows (in thousands):
 Office Lease Obligations Ground Lease Obligations Total Operating Lease Obligations
2019$2,237
 $2,114
 $4,351
20202,821
 2,350
 5,171
20212,719
 2,439
 5,158
20222,582
 2,492
 5,074
20231,871
 2,492
 4,363
Thereafter10,644
 422,169
 432,813
Total$22,874
 $434,056
 $456,930
Substantially all of the office space subject to the operating leases in the table above is for the use of our corporate offices and area operations. Rent expense is generally recognized on a straight-line basis and totaled $2.8 million, $3.0 million and $3.3 million for the years ended December 31, 2018, 2017 and 2016, respectively. Rent expense recognized for the ground leases totaled $2.3 million, $1.8 million and $1.7 million for the years ended December 31, 2018, 2017 and 2016, respectively, and is included within interest expense in the accompanying statements of operations.

Note 6 — Aimco Equity
Preferred Stock
At December 31, 2018 and 2017, Aimco had a single class of perpetual preferred stock outstanding, its Class A Cumulative Preferred Stock, with 5,000,000 shares authorized, issued and outstanding and with a balance of $125.0 million as of December 31, 2018 and 2017.
Aimco’s Class A Preferred Stock has a $0.01 per share par value, is senior to Aimco’s Common Stock, has a liquidation preference per share of $25.00 and is redeemable at our option on or after May 17, 2019. The holders of Preferred Stock are generally not entitled to vote on matters submitted to stockholders. Dividends at an annual rate of 6.88% are subject to declaration by Aimco’s Board of Directors and accrue if not declared.
During the year ended December 31, 2016, Aimco redeemed all of the outstanding shares of its Class Z Cumulative Preferred Stock at a redemption value of $34.8 million. We reflected the $0.7 million excess of the redemption value over the carrying amount and $1.3 million of previously deferred issuance costs as an adjustment of net income attributable to preferred stockholders for the year ended December 31, 2016.
In connection with the redemption of Aimco preferred stock, the Aimco Operating Partnership redeemed from Aimco a number of Partnership Preferred Units equal to the number of shares redeemed or repurchased by Aimco.
Common Stock
During the years ended December 31, 2018, 2017 and 2016, Aimco declared dividends per common share of $1.52, $1.44 and $1.32, respectively.
On February 3, 2019, Aimco’s Board of Directors authorized a reverse stock split, in which every 1.03119 Aimco common share will be combined into one Aimco common share, effective at the close of business on February 20, 2019. On the same date, the Board of Directors also declared a special dividend on the Aimco common stock that consists of $67.1 million in cash and 4.5 million shares of Aimco common stock. The special dividend will be payable on March 22, 2019, to stockholders of record as of February 22, 2019. The special dividend amount includes the regular quarterly cash dividend, which for 2019 is expected to be $0.39 per share. Stockholders will have the opportunity to elect to receive the special dividend in the form of all cash or all stock, subject to proration if either option is oversubscribed. The reverse split was authorized in order to neutralize the dilutive impact of the stock issued in the special dividend. As a result, total shares outstanding following completion of both the special dividend and the reverse stock split are expected to be unchanged from the total shares outstanding immediately prior to the transactions. Some stockholders may have more Aimco shares and some may have fewer based on their individual elections.
Pro forma Earnings per Share (unaudited)
In financial statements issued after the effective date of the reverse stock split, we are required to retroactively recognize the reverse stock split in the calculation of basic and diluted earnings per share. The shares issued in connection with the special dividend will be included in the calculation of basic and diluted earnings per share on a prospective basis, and are therefore not included in the pro forma amounts disclosed below. If the reverse stock split had been effective prior to issuance of these financial statements, basic and diluted weighted average shares outstanding and earnings per share for the years ending December 31, 2018, 2017 and 2016 would have been (shares in thousands):
 2018 2017 2016
Weighted average shares, basic151,152
 151,595
 151,282
Weighted average shares, diluted151,334
 152,060
 151,669
Basic earnings per share$4.34
 $2.02
 $2.76
Diluted earnings per share$4.34
 $2.02
 $2.75
Registration Statements
Aimco and the Aimco Operating Partnership have a shelf registration statement that provides for the issuance of equity and debt securities by Aimco and debt securities by the Aimco Operating Partnership.

Note 7 — Partners’ Capital
Partnership Preferred Units Owned by Aimco
At December 31, 2018 and 2017, the Aimco Operating Partnership had outstanding preferred units in classes and amounts similar to Aimco’s Preferred Stock described in Note 6, or Partnership Preferred Units. All of these Partnership Preferred Units were owned by Aimco during the periods presented.
The Partnership Preferred Units are senior to the Aimco Operating Partnership’s common partnership units. The Partnership Preferred Units do not have voting rights, except the right to approve certain changes to the Aimco Operating Partnership’s Partnership Agreement that would adversely affect holders of such class of units. Distributions on Partnership Preferred Units are subject to being declared by the General Partner. The Partnership Preferred Units are redeemable by the Aimco Operating Partnership only in connection with a concurrent redemption by Aimco of the corresponding Aimco Preferred Stock held by unrelated parties.
As discussed in Note 6, during the year ended December 31, 2016, Aimco redeemed its Class Z Cumulative Preferred Stock. In connection with this redemption, the Aimco Operating Partnership redeemed from Aimco a corresponding number of Partnership Preferred Units.
Redeemable Preferred OP Units
In addition to the Partnership Preferred Units owned by Aimco, the Aimco Operating Partnership has outstanding various classes of redeemable Partnership Preferred Units owned by third parties, which we classifyrefer to as availablepreferred OP Units. As of December 31, 2018 and 2017, the Aimco Operating Partnership had the following classes of preferred OP Units (stated at their redemption values, in thousands, except unit and per unit data):
 Distributions per Annum Units Issued and Outstanding Redemption Values
Class of Preferred UnitsPercent Per Unit 2018 2017 2018 2017
Class One8.75% $8.00
 90,000
 90,000
 $8,229
 $8,229
Class Two1.92% $0.48
 14,240
 17,750
 356
 444
Class Three7.88% $1.97
 1,338,524
 1,338,524
 33,463
 33,462
Class Four8.00% $2.00
 644,954
 644,954
 16,124
 16,124
Class Six8.50% $2.13
 773,693
 780,036
 19,342
 19,501
Class Seven7.87% $1.97
 27,960
 27,960
 699
 699
Class Nine6.00% $1.50
 243,112
 243,112
 6,078
 6,078
Class Ten6.00% $1.50
 680,000
 680,000
 17,000
 17,000
Total    3,812,483
 3,822,336
 $101,291
 $101,537
Each class of preferred OP Units is currently redeemable at the holders’ option. The Aimco Operating Partnership, at its sole discretion, may settle such redemption requests in cash or cause Aimco to issue shares of its Common Stock with a value equal to the redemption price. In the event the Aimco Operating Partnership requires Aimco to issue shares of Common Stock to settle a redemption request, the Aimco Operating Partnership would issue to Aimco a corresponding number of common partnership units. The Aimco Operating Partnership has a redemption policy that requires cash settlement of redemption requests for sale (AFS) securities,the preferred OP Units, subject to limited exceptions. Subject to certain conditions, the Class Four and our interest rate swaps. Information regarding these items measured at fair value, both of whichClass Six preferred OP Units may be converted into common OP Units.
These redeemable units are classified within Level 2temporary equity in Aimco’s consolidated balance sheets and within temporary capital in the Aimco Operating Partnership’s consolidated balance sheets.
During the years ended December 31, 2018, 2017 and 2016, approximately 10,000, 67,000 and 69,000 preferred OP Units, respectively, were redeemed in exchange for cash, and no preferred OP Units were redeemed in exchange for shares of Aimco Common Stock.
The Class Ten preferred OP Units were issued as partial consideration for an acquisition during the year ended December 31, 2016.

The following table presents a reconciliation of the GAAPAimco Operating Partnership’s preferred OP Units during the years ended December 31, 2018, 2017 and 2016 (in thousands):
 2018 2017 2016
Balance at January 1$101,537
 $103,201
 $87,926
Preferred distributions(7,740) (7,764) (7,239)
Redemption of preferred units and other(246) (1,664) (1,725)
Issuance of preferred units
 
 17,000
Net income7,740
 7,764
 7,239
Balance at December 31$101,291
 $101,537
 $103,201
Common Partnership Units
In the Aimco Operating Partnership’s consolidated balance sheets, the common partnership units held by Aimco are classified within Partners’ Capital as General Partner and Special Limited Partner capital and the common OP Units are classified within Limited Partners’ capital. In Aimco’s consolidated balance sheets, the common OP Units are classified within permanent equity as common noncontrolling interests in the Aimco Operating Partnership.
Common partnership units held by Aimco are not redeemable whereas common OP Units are redeemable at the holders’ option, subject to certain restrictions, on the basis of one common OP Unit for either one share of Common Stock or cash equal to the fair value hierarchy,of a share of Common Stock at the time of redemption. Aimco has the option to deliver shares of Common Stock in exchange for all or any portion of the common OP Units tendered for redemption. When a limited partner redeems a common OP Unit for Common Stock, Limited Partners’ capital is reduced and the General Partner and Special Limited Partners’ capital is increased.
During the years ended December 31, 2018, 2017 and 2016, approximately 224,000, 268,000 and 248,000 common OP Units, respectively, were redeemed in exchange for cash, and no common OP Units were redeemed in exchange for shares of Common Stock.
The holders of the common OP Units receive distributions, prorated from the date of issuance, in an amount equivalent to the dividends paid to holders of Common Stock. During the years ended December 31, 2018, 2017 and 2016, the Aimco Operating Partnership declared distributions per common unit of $1.52, $1.44 and $1.32, respectively
On February 3, 2019, the Board of Directors of the Aimco Operating Partnership’s general partner authorized a reverse unit split in which every 1.03119 common partnership units will be combined into one common partnership unit. The reverse split is effective at the close of business on February 20, 2019, and corresponds to a similar split effected by Aimco with respect to its common shares at the same time. On the same date, the Board of Directors also declared a special distribution to the holders of Aimco Operating Partnership common partnership units that consists of $71.5 million in cash and 4.8 million common partnership units. The special distribution will be payable on March 22, 2019, to unitholders of record as of February 22, 2019. The special distribution also corresponds to a similar special dividend paid at the same time to holders of Aimco common shares. The reverse split was authorized in order to neutralize the dilutive impact of the units issued in the special distribution. As a result, total common partnership units outstanding following completion of both the special distribution and the reverse unit split are expected to be unchanged from the total common partnership units outstanding immediately prior to the transactions.
Pro forma Earnings per Common Unit (Unaudited)
In financial statements issued after the effective date of the reverse unit split, we are required to retroactively recognize the reverse unit split in the calculation of basic and diluted earnings per unit. The units issued in connection with the special distribution will be included in the calculation of basic and diluted earnings per unit on a prospective basis, and are therefore not included in the pro forma amounts disclosed below. If the reverse unit split had been effective prior to issuance of these financial statements, basic and diluted weighted average units outstanding and earnings per unit for the years ending December 31, 2018, 2017 and 2016 would have been (units in thousands):
 2018 2017 2016
Weighted average units, basic158,890
 158,793
 158,808
Weighted average units, diluted159,073
 159,257
 159,194
Basic earnings per unit$4.35
 $2.02
 $2.76
Diluted earnings per unit$4.34
 $2.02
 $2.75

Note 8 — Share-Based Compensation
We have a stock award and incentive program to attract and retain officers and independent directors. As of December 31, 2018, approximately 4.7 million shares were available for issuance under our Amended and Restated 2015 Stock Award and Incentive Plan, or the 2015 Plan. The total number of shares available for issuance under this plan may be increased by an additional 0.3 million shares to the extent of any forfeiture, cancellation, exchange, surrender, termination or expiration of an award outstanding under our 2007 Stock Award and Incentive Plan. Awards under the 2015 Plan may be in the form of incentive stock options, non-qualified stock options and restricted stock, or other types of awards as authorized under the plan.
Our plans are administered by the Compensation and Human Resources Committee of Aimco’s Board of Directors. In the case of stock options, the exercise price of the options granted may not be less than the fair market value of a share of Common Stock at the date of grant.
Total compensation cost recognized for stock based awards was $9.7 million, $9.3 million and $8.6 million for the years ended December 31, 2018, 2017 and 2016, respectively. Of these amounts, $1.2 million, $1.4 million and $1.0 million, respectively, were capitalized. At December 31, 2018, total unvested compensation cost not yet recognized was $11.0 million. We expect to recognize this compensation over a weighted average period of approximately 1.6 years.
We have granted five different types of awards that are outstanding as of December 31, 2018. We have outstanding stock options and restricted stock awards that are subject to time-based vesting and require continuous employment, typically over a period of four years from the grant date, and we refer to these awards as Time-Based Stock Options and Time-Based Restricted Stock, respectively. We also have outstanding stock options, restricted stock awards and two forms of long-term incentive partnership units, or LTIP units, that vest conditioned on Aimco’s total shareholder return, or TSR, relative to the NAREIT Apartment Index (60% weighting) and the MSCI US REIT Index (40% weighting) over a forward-looking performance period of three years. We refer to these awards as TSR Stock Options, TSR Restricted Stock, TSR LTIP I units, and TSR LTIP II units. Vested LTIP II units may be converted at the holders option to LTIP Units for a strike price over a term of ten years. Earned TSR-based awards, if any, will vest 50% on each of the third anniversary and fourth anniversary of the grant date, based on continued employment. The term of Time-Based Stock Options and TSR Stock Options is generally ten years from the date of grant.
We recognize compensation cost associated with Time-Based awards ratably over the requisite service periods, which are typically four years. We recognize compensation cost related to the TSR-based awards, which have graded vesting periods, over the requisite service period for each separate vesting tranche of the award, commencing on the grant date. The value of the TSR-based awards take into consideration the probability that the market condition will be achieved; therefore previously recorded compensation cost is not adjusted in the event that the market condition is not achieved and awards do not vest.
Stock Options
During the years ended December 31, 2018, 2017 and 2016, we granted TSR Stock Options.
The following table summarizes activity for our outstanding stock options, for the years ended December 31, 2018, 2017 and 2016 (options in thousands):
 2018 2017 2016
 Number of Options Weighted
Average
Exercise
Price
 Number of Options Weighted
Average
Exercise
Price
 Number of Options Weighted
Average
Exercise
Price
Outstanding at beginning of year648
 $40.08
 675
 $29.55
 1,394
 $30.85
Granted
 
 184
 44.07
 216
 38.73
Exercised(2) 28.33
 (211) 9.90
 (934) 33.61
Forfeited
 
 
 
 (1) 29.11
Outstanding at end of year646
 $40.12
 648
 $40.08
 675
 $29.55
Exercisable at end of year186
 $38.18
 128
 $37.59
 280
 $16.38
The intrinsic value of a stock option represents the amount by which the current price of the underlying stock exceeds the exercise price of the option. As of December 31, 2018, options outstanding had an aggregate intrinsic value of $2.5 million and a weighted average remaining contractual term of 7.0 years. Options exercisable at December 31, 2018, had an aggregate intrinsic value of $1.1 million and a weighted average remaining contractual term of 5.9 years. The intrinsic value of stock options exercised during the years ended December 31, 2018, 2017 and 2016, was $32 thousand, $7.1 million and $11.1 million, respectively.

The weighted average grant date fair value of stock options granted during the years ended 2017 and 2016 was $11.39 and $9.94 per option, respectively.
Time-Based Restricted Stock Awards
The following table summarizes activity for Time-Based Restricted Stock awards for the years ended December 31, 2018, 2017 and 2016 (shares in thousands):
 2018 2017 2016
 Number of Shares Weighted
Average
Grant-Date
Fair Value
 Number of Shares Weighted
Average
Grant-Date
Fair Value
 Number of Shares Weighted
Average
Grant-Date
Fair Value
Unvested at beginning of year160
 $37.63
 249
 $33.61
 339
 $29.96
Granted51
 40.01
 45
 44.07
 91
 40.03
Vested(86) 34.42
 (134) 32.35
 (181) 29.99
Unvested at end of year125
 $40.82
 160
 $37.63
 249
 $33.61
The aggregate fair value of shares that vested during the years ended December 31, 2018, 2017 and 2016 was $8.4 million, $6.0 million and $7.0 million, respectively.
TSR Restricted Stock Awards
The following table summarizes activity for TSR Restricted Stock awards for the years ended December 31, 2018, 2017 and 2016 (shares in thousands):
 2018 2017 2016
 Number of Shares Weighted
Average
Grant-Date
Fair Value
 Number of Shares Weighted
Average
Grant-Date
Fair Value
 Number of Shares Weighted
Average
Grant-Date
Fair Value
Unvested at beginning of year253
 $40.70
 214
 $39.66
 123
 $39.72
Granted45
 41.71
 39
 46.39
 91
 39.59
Vested(123) 39.72
 
 
 
 
Unvested at end of year175
 $41.65
 253
 $40.70
 214
 $39.66
TSR LTIP I Units
The following table summarizes activity for TSR LTIP I units for the years ended December 31, 2018 and 2017 (units in thousands):
 2018 2017
 Number of Units Weighted
Average
Grant-Date
Fair Value
 Number of Units Weighted
Average
Grant-Date
Fair Value
Unvested at beginning of year45
 $46.21
 
 $
Granted48
 41.48
 45
 46.21
Unvested at end of year93
 $43.78
 45
 $46.21

TSR LTIP II Units
The following table summarizes activity for TSR LTIP II units for the years ended December 31, 2018 and 2017 (numbers of units in thousands):
 2018
 Number of Units Weighted
Average
Grant-Date
Fair Value
Unvested at beginning of year
 $
Granted243
 41.84
Unvested at end of year243
 $41.84
Determination of Grant-Date Fair Value of Awards
We estimated the fair value of TSR-based awards granted in 2018, 2017 and 2016 using a Monte Carlo model using the assumptions set forth in the table below.
The risk-free interest rate reflects the annualized yield of a zero coupon U.S. Treasury security with a term equal to the expected term of the option. The expected dividend yield reflects expectations regarding cash dividend amounts per share paid on Aimco’s Common Stock during the expected term of the awards. Expected volatility reflects an average of the historical volatility of Aimco’s Common Stock during the historical period commensurate with the expected term of the options that ended on the date of grant, and the implied volatility is calculated from observed call option contracts closest to the expected term. The derived vesting period of TSR Restricted Stock and TSR LTIP I units was determined based on the graded vesting terms. The expected term of the TSR-options and TSR LTIP II units was based on historical option exercises and post-vesting terminations. The midpoints of our valuation assumptions for the 2018, 2017 and 2016 grants were as follows:
 2018 2017 2016
Grant date market value of a common share$40.95
 $44.07

$38.73
Risk-free interest rate2.32% 1.57%
1.15%
Dividend yield3.52% 3.27%
3.41%
Expected volatility18.02% 21.33%
21.24%
Derived vesting period of TSR Restricted Stock and TSR LTIP I units3.4 years
 3.4 years

3.4 years
Weighted average expected term of TSR Stock Options and LTIP II units5.6 years
 5.8 years
 5.8 years
The grant date fair value for the Time-Based Restricted Stock awards reflects the closing price of a share of Aimco common stock on the grant date.

Note 9 — Income Taxes
Deferred income taxes reflect the net effects of temporary differences between the carrying amounts of assets and liabilities of the TRS entities for financial reporting purposes and the amounts used for income tax purposes. Significant components of our deferred tax liabilities and assets are as follows (in thousands):
 December 31,
 2018 2017
Deferred tax liabilities:   
Real estate and real estate partnership basis differences$12,058
 $32,032
Deferred tax assets:   
Net operating, capital and other loss carryforwards$7,022
 $9,523
Accruals and expenses7,432
 6,575
Tax credit carryforwards67,530
 73,450
Management contracts and other2,064
 200
Total deferred tax assets84,048
 89,748
Valuation allowance(4,930) (25,489)
Net deferred tax assets$67,060
 $32,227
In December 2017, the U.S. Congress passed the Tax Cuts and Jobs Act, or the 2017 Act, which is effective for years beginning with 2018. The 2017 Act provided for a reduction in the federal income tax rate. In accordance with GAAP, we revalued our deferred tax assets and liabilities as of December 31, 2017. We finalized our accounting for the tax effects of enactment of the 2017 Act during the year ended December 31, 2018, resulting in our recognition of a cumulative net tax benefit of $15.6 million over the two years.
At December 31, 2018, we had federal and state net operating loss carryforwards, or NOLs, for which the deferred tax asset was approximately $7.0 million, before a valuation allowance of $4.9 million. The NOLs expire in years 2019 to 2034. Subject to certain separate return limitations, we may use these NOLs to offset a portion of state taxable income generated by our TRS entities.
As of December 31, 2018, we had low-income housing and rehabilitation tax credit carryforwards and corresponding deferred tax assets of approximately $67.5 million for income tax purposes that expire in years 2034 to 2038. In light of the lower federal tax rate under the 2017 Act, our TRS entities must generate more taxable income in future years to utilize tax credit carryforwards, which are recorded as deferred tax assets. As a result, during the year ended December 31, 2017, we recognized a partial valuation allowance of $15.4 million against the deferred tax assets associated with low-income housing and rehabilitation tax credit carryforwards. Due to the sale of our Asset Management business, discussed further in Note 3, during the year ended December 31, 2018, we reversed the remaining valuation allowance recognized in 2017 against our deferred tax benefits that we now expect to utilize.
A reconciliation of the beginning and ending balance of our unrecognized tax benefits is presented below (in thousands):
 AFS Investments Interest Rate Swaps Total
Fair value at December 31, 2013$58,408
 $(4,604) $53,804
Investment accretion3,827
 
 3,827
Unrealized losses included in interest expense
 (48) (48)
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss
 1,685
 1,685
Unrealized losses included in equity and partners’ capital(1,192) (2,306) (3,498)
Fair value at December 31, 2014$61,043
 $(5,273) $55,770
Investment accretion4,245
 
 4,245
Unrealized losses included in interest expense
 (44) (44)
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss
 1,678
 1,678
Unrealized gains (losses) included in equity and partners’ capital214
 (1,299) (1,085)
Fair value at December 31, 2015$65,502
 $(4,938) $60,564
 2018 2017 2016
Balance at January 1$2,476
 $2,286
 $2,897
Additions (reductions) based on tax positions related to prior years142
 190
 (611)
Balance at December 31$2,618
 $2,476
 $2,286

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Our investments classified as AFSlimitations has not yet elapsed, our United States federal income tax returns for the year ended December 31, 2014 and subsequent years and certain of our State income tax returns for the year ended December 31, 2014 and subsequent years are presented withincurrently subject to examination by the IRS or other assets intaxing authorities. If recognized, the accompanying consolidated balance sheets. We hold positions inunrecognized benefit would affect the securitization which pay interest currently, and we also holdeffective rate.
In 2014, the first loss position in the securitization which accrues interest over the termIRS initiated an audit of the investment. We are accreting the discount to the $100.9 million face value of the investments into interest income using the effective interest method over the remaining expected term of the investments, which,Aimco Operating Partnership’s 2011 and 2012 tax years. This audit remains in process as of December 31, 2015, was approximately 5.4 years. Our amortized cost basis for these investments, which represents the original cost adjusted for interest accretion less interest payments received, was $67.8 million and $63.6 million at December 31, 2015 and 2014, respectively.
2018. We estimate the fair value of these investments in accordance with GAAP using an income and market approach with primarily observable inputs, including yields and other information regarding similar types of investments, and adjusted for certain unobservable inputs specific to these investments. The fair value of the positions that pay interest currently, which typically moves in an inverse relationship with the movements in interest rates, exceeded the amortized cost of these investments at the balance sheet dates. The fair value of the first loss position, which is less correlated to movements in interest rates, was less than the amortized cost at the balance sheet dates. We currently expect to hold the investments to their maturity dates and we believe we will fully recover our basis in the investments. Accordingly, wedo not believe the current impairment inaudit will have any material effect on our unrecognized tax benefits, financial condition or results of operations.
Our policy is to include any interest and penalties related to income taxes within the fair value, as compared to the amortized cost basis, of the first loss position is temporary and we have not recognized any of the loss in value in earnings.
For our variable rate debt, we are sometimes required by limited partnersincome tax line item in our consolidated real estate partnerships to limit our exposure to interest rate fluctuations by entering into interest rate swap agreements, which moderate our exposure to interest rate risk by effectively convertingstatements of operations.

In accordance with the interest on variable rate debt to a fixed rate. We estimate the fair value of interest rate swaps using an income approach with primarily observable inputs including information regarding the hedged variable cash flows and forward yield curves relating to the variable interest rates on which the hedged cash flows are based.
As of December 31, 2015 and 2014,accounting requirements for stock-based compensation, we had interest rate swaps with aggregate notional amounts of $49.9 million and $50.3 million, respectively. As of December 31, 2015, these swaps had a weighted average remaining term of 5.0 years. We have designated these interest rate swaps as cash flow hedges. The fair value of these swaps is presented within accrued liabilities and other in our consolidated balance sheets, and wemay recognize any changes in the fair value as an adjustment of accumulated other comprehensive loss within equity and partners’ capital to the extent of their effectiveness.
If the forward rates at December 31, 2015, remain constant, we estimate that during the next 12 months, we would reclassify into earnings approximately $1.7 million of the unrealized losses in accumulated other comprehensive loss. If market interest rates increase above the 3.43% weighted average fixed rate under these interest rate swaps we will benefit from net cash payments due to us from our counterparty to the interest rate swaps.
Fair Value Disclosures
We believe that the aggregate fair value of our cash and cash equivalents, receivables and payables approximates their aggregate carrying amounts at December 31, 2015 and 2014, due to their relatively short-term nature and high probability of realization. The estimated aggregate fair value of our consolidated total indebtedness was approximately $4.0 billion and $4.4 billion at December 31, 2015 and 2014, respectively, as compared to aggregate carrying amounts of $3.9 billion and $4.1 billion, respectively. Substantially all of the difference between the fair value and the carrying value relates to apartment communities we wholly own. We estimate the fair value of our consolidated debt using an income and market approach, including comparison of the contractual terms to observable and unobservable inputs such as market interest rate risk spreads, contractual interest rates, remaining periods to maturity, collateral quality and loan to value ratios on similarly encumbered assets within our portfolio. We classify the fair value of our consolidated debt within Level 3 of the GAAP valuation hierarchy based on the significance of certain of the unobservable inputs used to estimate their fair values.
Note 7 — Commitments and Contingencies
Commitments
In connection with our development, redevelopment and capital improvement activities, we have entered into various construction-related contracts and we have made commitments to complete certain projects, pursuant to financing or other arrangements. As of December 31, 2015, our commitments related to these capital activities totaled approximately $110.0 million, most of which we expect to incur during the next 12 months. Our commitments related to our One Canal development project will be funded in part by a $114.0 million non-recourse property loan, of which $27.8 million was available to draw at December 31, 2015.
During July 2015, we entered into a contract to acquire an apartment community currently under construction in Northern California for $320.0 million, for which we have provided a nonrefundable deposit of $25.0 million.  The acquisition is expected

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to close upon completion of construction in the summer of 2016. We intend to fund a portion of the acquisition through a property loan and the balance with proceeds from the sale of two apartment communities.
We enter into certain commitments for future purchases of goods and servicestax benefits in connection with the operationsexercise of stock options by employees of our apartment communities. Those commitments generally have termsTRS entities and the vesting of one yearrestricted stock awards. We recognize the tax effects related to stock based compensation through earnings in the period the compensation was recognized.
Significant components of the income tax benefit or lessexpense are as follows and reflect expenditure levels comparable to our historical expenditures.
Tax Credit Arrangements
We are required to manage certain consolidatedclassified within income tax benefit in income before gain on dispositions and gain on dispositions of real estate, partnerships in compliance with various laws, regulations and contractual provisions that apply to our historic and low-income housingnet of tax, credit syndication arrangements. In some instances, noncompliance with applicable requirements could result in projected tax benefits not being realized and require a refund or reduction of investor capital contributions, which are reported as deferred income in our consolidated balance sheet, until such timestatements of operations for the years ended December 31, 2018, 2017 and 2016 (in thousands):
 2018 2017 2016
Current:     
Federal$11,269
 $(938) $5,038
State10,537
 525
 2,916
Total current21,806
 (413) 7,954
      
Deferred:     
Federal(29,243) (10,908) (26,173)
State(5,590) (3,621) (623)
Revaluation of deferred taxes due to change in tax rate
 (15,894) 
Total deferred(34,833) (30,423) (26,796)
Total benefit$(13,027) $(30,836) $(18,842)
Consolidated income or loss subject to tax consists of pretax income or loss of our TRS entities and income and gains retained by the REIT. For the years ended December 31, 2018, 2017 and 2016, we had consolidated net income subject to tax of $158.6 million, net loss subject to tax of $55.6 million and net income subject to tax of $109.3 million, respectively.
The reconciliation of income tax attributable to operations computed at the United States statutory rate to income tax benefit is shown below (dollars in thousands):
 2018 2017 2016
 Amount Percent Amount Percent Amount Percent
Tax provision (benefit) at United States statutory rates on consolidated income or loss subject to tax$33,296
 21.0 % $(19,459) 35.0 % $38,257
 35.0 %
State income tax expense, net of federal tax (benefit) expense12,252
 7.7 % (1,769) 3.2 % 7,152
 6.5 %
Establishment of deferred tax asset related to partnership basis difference (1)
  % (3,501) 6.3 % 
  %
Effect of permanent differences302
 0.2 % (1,629) 2.9 % (132) (0.1)%
Tax effect of intercompany transactions (2)(33,250) (21.0)% 
  % (47,369) (43.3)%
Tax credits(6,897)
(4.4)% (9,607) 17.3 % (16,750) (15.3)%
Tax reform revaluation (3)288

0.2 % (15,894) 28.6 % 
  %
(Decrease) increase in valuation allowance (4)(20,434)
(12.9)% 21,023
 (37.8)% 
  %
Other1,416

0.9 % 
  % 
  %
Total income tax benefit$(13,027) (8.3)% $(30,836) 55.5 % $(18,842) (17.2)%
(1)2017 includes the establishment of a deferred tax asset related to partnership basis difference when it became apparent that it would reverse in the foreseeable future. This deferred tax asset was fully reserved in the valuation allowance described below as of December 31, 2017.
(2)2016 includes the effect of intercompany asset transfers between the Aimco Operating Partnership and TRS entities, for which tax was deferred and recognized as the assets affected GAAP income or loss, for example, through depreciation, impairment, or upon the sale of the asset to a third-party. Effective January 1, 2017, we adopted a new accounting standard applicable to intercompany asset transfers. As a result, the accumulated unrecognized deferred tax expense associated with historical intercompany transfers was recognized as a cumulative effect adjustment through retained earnings at that time. 2018 includes the tax benefit to establish the initial deferred tax asset from the intercompany transfer of a portion of the Asset Management business between the Aimco Operating Partnership and TRS entities.
(3)Reflects revaluation of deferred tax assets and liabilities using the TRS entities’ lower effective tax rates resulting from the 2017 Act. Accounting for the tax effects of enactment of the 2017 Act was finalized during the year ended December 31, 2018.

(4)2017 includes a $15.4 million valuation allowance against the deferred tax assets associated with rehabilitation tax credits due to the lower federal tax rate under the 2017 Act. This valuation allowance was reversed in 2018 as a result of the sale of our Asset Management business.
Income taxes paid totaled approximately $11.5 million, $7.4 million and $2.2 million in the years ended December 31, 2018, 2017 and 2016, respectively.
For income tax purposes, dividends paid to holders of Common Stock primarily consist of ordinary income, capital gains, qualified dividends and unrecaptured Section 1250 gains, or a combination thereof. For the years ended December 31, 2018, 2017 and 2016, dividends per share held for the entire year were estimated to be taxable as our obligationfollows:
 2018 2017 2016
 Amount Percentage Amount Percentage Amount Percentage
Ordinary income$0.51
 33.4% $0.75
 51.5% $0.45
 34.2%
Capital gains0.93
 61.2% 0.51
 35.7% 0.47
 35.4%
Qualified dividends
 % 0.02
 1.6% 0.13
 9.9%
Unrecaptured Section 1250 gain0.08
 5.4% 0.16
 11.2% 0.27
 20.5%
 $1.52
 100.0% $1.44
 100.0% $1.32
 100.0%
Note 10 — Earnings per Share/Unit
Aimco and the Aimco Operating Partnership calculate basic earnings per common share and basic earnings per common unit based on the weighted average number of shares of Common Stock and common partnership units and participating securities outstanding, and calculate diluted earnings per share and diluted earnings per unit taking into consideration dilutive common stock and common partnership unit equivalents and dilutive convertible securities outstanding during the period.
Our common stock equivalents and common partnership unit equivalents include options to deliver tax benefits is relieved. The remaining compliance periods for our tax credit syndication arrangements range from less than one yearpurchase shares of Common Stock, which, if exercised, would result in Aimco’s issuance of additional shares and the Aimco Operating Partnership’s issuance to 10 years. WeAimco of additional common partnership units equal to the number of shares purchased under the options. These equivalents also include unvested TSR Restricted Stock awards that do not anticipatemeet the definition of participating securities, which would result in the issuance of additional common shares and common partnership units equal to the number of shares that any material refundsvest. The dilutive effect of these securities was 0.2 million shares or reductionsunits, 0.5 million shares or units, and 0.4 million shares or units, respectively, for the years ended December 31, 2018, 2017 and 2016. Securities with dilutive effect are included in the denominator for calculating diluted earnings per share and unit during these periods. There were 0.3 million potential shares and 0.3 million potential units not dilutive and excluded from the denominator for calculating diluted earnings per share and per unit, respectively, for the year ended December 31, 2018. There were 0.2 million potential shares and 0.2 million potential units not dilutive and excluded from the denominator for calculating diluted earnings per share and per unit, respectively, for the years ended December 31, 2017 and 2016.
Our Time-Based Restricted Stock awards receive dividends similar to shares of investor capital contributions willCommon Stock and common partnership units prior to vesting and our TSR LTIP I units and TSR LTIP II units receive distributions based on specified percentages of the distributions paid to common partnership units prior to vesting and conversion. These dividends and distributions are not forfeited in the event the awards do not vest. Therefore, the unvested restricted shares and units related to these awards are participating securities. The effect of participating securities is included in basic and diluted earnings per share and unit computations using the two-class method of allocating distributed and undistributed earnings when the two-class method is more dilutive than the treasury stock method. At December 31, 2018, 2017 and 2016, there were 0.3 million, 0.2 million and 0.2 million shares of unvested participating restricted securities, respectively. At December 31, 2018, 2017 and 2016, there were 0.6 million, 0.3 million and 0.2 million units of unvested participating restricted securities, respectively.
As discussed in Note 7, the Aimco Operating Partnership has various classes of preferred OP Units, which may be requiredredeemed at the holders’ option. The Aimco Operating Partnership may redeem these units for cash, or at its option, shares of Common Stock. As of December 31, 2018, these preferred OP Units were potentially redeemable for approximately 2.3 million shares of Common Stock (based on the period end market price), or cash. The Aimco Operating Partnership has a redemption policy that requires cash settlement of redemption requests for the preferred OP Units, subject to limited exceptions. Accordingly, we have excluded these securities from earnings per share and unit computations for the periods presented above, and we expect to exclude them in connection with these arrangements.future periods.

Note 11 — Fair Value Measurements
Legal Matters
In addition to the matters described below, we are a party to various legal actions and administrative proceedings arising in the ordinary course of business, some of which are covered by our general liability insurance program, and none of which we expect to have a material adverse effect on our consolidated financial condition, results of operations or cash flows.
Limited Partnerships
In connection with our acquisitions of interests in real estate partnerships, we are sometimes subject to legal actions, including allegations that such activities may involve breaches of fiduciary duties to the partners of such real estate partnerships or violations of the relevant partnership agreements. We may incur costs in connection with the defense or settlement of such litigation. We believe that we comply with our fiduciary obligations and relevant partnership agreements. Although the outcome of any litigation is uncertain, we do not expect any such legal actions to have a material adverse effect on our consolidated financial condition, results of operations or cash flows.
Environmental
Various Federal,federal, state and local laws subject apartment community owners or operators to liability for management, and the costs of removal or remediation, of certain potentially hazardous materials that may be present in the land or buildings of an apartment community. Potentially hazardous materials may include polychlorinated biphenyls, petroleum-based fuels, lead-based paint, or asbestos. Such laws often impose liability without regard to fault or whether the owner or operator knew of, or was responsible for, the presence of such materials. The presence of, or the failure to manage or remediate properly, these materials may adversely affect occupancy at such apartment communities as well as the ability to sell or finance such apartment communities. In addition, governmental agencies may bring claims for costs associated with investigation and remediation actions, damages to natural resources and for potential fines or penalties in connection with such damage or with respect to the improper management of hazardous materials.actions. Moreover, private plaintiffs may potentially make claims for investigation and remediation costs they incur or for personal injury, disease, disability or other infirmities related to the alleged presence of hazardous materials at an apartment community.materials. In addition to potential environmental liabilities

or costs associated with our current apartment communities, we may also be responsible for such liabilities or costs associated with communities we acquire or manage in the future, or apartment communities we no longer own or operate.
We are engaged in discussions with the Environmental Protection Agency, or EPA, and the Indiana Department of Environmental Management, or IDEM, regarding contaminated groundwater in a residential area in the vicinity ofnear an Indiana apartment community that has not been owned by us since 2008. The EPA alleges that we are liable for addressing the contamination in the residential area becauseallegedly derives from a dry cleaner that operated on our former property, prior to our ownership, discharged hazardous materials into the sanitary sewers and the environment.ownership. We have undertakenundertook a voluntary remediation of the dry cleaner contamination atunder IDEM’s oversight. In 2016, EPA listed our former property under the oversightcommunity and a number of the Indiana Department of Environmental Management, or IDEM.  However, IDEM has formally sought to terminate us from the voluntary remediation, and we are presently appealing that termination.  Based on our review of the scientific data, we believe that the presence of hazardous materialsresidential communities in the separate residential area under review by the EPA is attributable to neighboring property owners (including an auto parts manufacturer), and not the dry cleaner.  The EPA is now proposing to list the areavicinity on the National Priorities List, or NPL (i.e., as a Superfund site), which would make. In May 2018, we prevailed on our federal judicial appeal vacating the site eligibleSuperfund listing. We continue to work with EPA and IDEM to identify options for additional Federal funding.  We have filed formal comments withclean-up of the EPA opposing the proposed listing. Were the site to be listed, the EPA could use the funding to further investigate and clean-up the residential area and could then seek to recoup its costs from responsible parties.site. Although the outcome of this process

F-29


isthese processes are uncertain, we do not expect thetheir resolution to have a material adverse effect on our consolidated financial condition, results of operations or cash flows.
We also have been contacted by regulators and the current owner of a property in Lake Tahoe, California, regarding environmental issues allegedly stemming from the historic operation of a dry cleaner on the site.cleaner. An entity owned by us was the former general partner of a now-dissolved companypartnership that previously owned thea site that was used for dry cleaner site.cleaning. That entity and the current property owner have been remediating the dry cleaner site since 2009, under the oversight of the Lahontan Regional Water Quality Control Board, or Lahontan. In May 2017, Lahontan recently tested domestic wells in the area and found two wells with contaminants linked to dry cleaning.  We entered into an agreement with Lahontan and the current owner to pay for an alternative water connection at an insignificant cost and have fulfilled our obligations under that agreement.  During September 2015, Lahontan sent us and the current ownerissued a proposedfinal cleanup and abatement order that if entered, would require usnames four potentially-responsible parties, acknowledges that there may be additional responsible parties, and requires the current ownernamed parties to perform additional groundwater investigation and corrective actions with respect to onsite and offsite contamination. We are currently assessing potential legal and technical grounds for challenging and/or narrowingappealing the scope of the proposed order.final order while simultaneously complying with it. Although the outcome of this process is uncertain, we do not expect theits resolution to have a material adverse effect on our consolidated financial condition, results of operations or cash flows.
We have determined that our legal obligations to remove or remediate certain potentially hazardous materials may be conditional asset retirement obligations, as defined in GAAP. Except in limited circumstances where the asset retirement activities are expected to be performed in connection with a planned construction project or apartment community casualty, we believe that the fair value of our asset retirement obligations cannot be reasonably estimated due to significant uncertainties in the timing and manner of settlement of those obligations. Asset retirement obligations that are reasonably estimable as of December 31, 2015,2018, are immaterial to our consolidated financial condition, results of operations and cash flows.
Operating Leases
We are obligated under non-cancelable operating leases for office space and equipment.space. We are also obligated under non-cancelable operating leases for the ground under certain of our apartment communities with remaining terms ranging from 3352 years to 6999 years. Approximate minimumMinimum annual rental payments under operating leases are as follows (in thousands):
Office and Equipment Lease ObligationsGround Lease ObligationsTotal Operating Lease ObligationsOffice Lease Obligations Ground Lease Obligations Total Operating Lease Obligations
2016$3,061
$795
$3,856
20172,361
895
3,256
20181,062
995
2,057
2019226
1,095
1,321
$2,237
 $2,114
 $4,351
2020153
1,331
1,484
2,821
 2,350
 5,171
20212,719
 2,439
 5,158
20222,582
 2,492
 5,074
20231,871
 2,492
 4,363
Thereafter
67,876
67,876
10,644
 422,169
 432,813
Total$6,863
$72,987
$79,850
$22,874
 $434,056
 $456,930
Substantially all of the office space subject to the operating leases in the table above is for the use of our corporate offices and area operations. Rent expense is generally recognized on a straight-line basis and totaled $3.2$2.8 million, $3.3$3.0 million and $4.2$3.3 million for the years ended December 31, 2015, 20142018, 2017 and 2013,2016, respectively. Rent expense recognized for the ground leases totaled $0.9$2.3 million, $1.0$1.8 million and $0.9$1.7 million for the years ended December 31, 2015, 20142018, 2017 and 2013,2016, respectively, and is included within interest expense in the accompanying statements of operations.

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Note 8 — Income Taxes
Deferred income taxes reflect the net effects of temporary differences between the carrying amounts of assets and liabilities of the TRS entities for financial reporting purposes and the amounts used for income tax purposes. Significant components of our deferred tax liabilities and assets are as follows (in thousands):
 December 31,
 2015 2014
Deferred tax liabilities:   
Real estate and real estate partnership basis differences$31,726
 $38,231
    
Deferred tax assets:   
Net operating, capital and other loss carryforwards$8,024
 $6,699
Accruals and expenses4,917
 5,430
Tax credit carryforwards49,036
 29,714
Management contracts and other333
 267
Total deferred tax assets62,310
 42,110
Valuation allowance(4,467) (3,627)
Net deferred income tax assets$26,117
 $252
During the year ended December 31, 2015, we increased the valuation allowance on a net basis by approximately $0.8 million with a minor effect on the effective tax rate.
A reconciliation of the beginning and ending balance of our unrecognized tax benefits is presented below (in thousands):
 2015 2014 2013
Balance at January 1$2,286
 $2,871
 $3,536
Reductions as a result of a lapse of the applicable statutes
 
 (764)
Additions (reductions) based on tax positions related to prior years and current year excess benefits related to stock-based compensation611
 (585) 99
Balance at December 31$2,897
 $2,286
 $2,871
Because the statute of limitations has not yet elapsed, our United States Federal income tax returns for the year ended December 31, 2011, and subsequent years and certain of our State income tax returns for the year ended December 31, 2011, and subsequent years are currently subject to examination by the IRS or other taxing authorities. Approximately $2.3 million of unrecognized benefit, if recognized, would affect the effective rate.
On March 19, 2014, the IRS notified the Aimco Operating Partnership of its intent to audit the 2011 and 2012 tax years.  This audit remains in process as of December 31, 2015. We do not believe the audit will have any material effect on our unrecognized tax benefits, financial condition or results of operations.
Our policy is to include any interest and penalties related to income taxes within the income tax line item in our consolidated statements of operations.
In accordance with the accounting requirements for stock-based compensation, we may recognize tax benefits in connection with the exercise of stock options by employees of our TRS entities and the vesting of restricted stock awards. At December 31, 2015 we had $1.6 million in cumulative excess tax benefits from employee stock option exercises and vested restricted stock awards. None of the excess tax benefits have yet been realized.

F-31


Significant components of the income tax benefit or expense are as follows and are classified within income tax benefit in continuing operations, income from discontinued operations, net of tax, and gain on dispositions or real estate, net of tax, in our statements of operations for the years ended December 31, 2015, 2014 and 2013 (in thousands):
 2015 2014 2013
Current:     
Federal$1,310
 $
 $
State1,357
 970
 63
Total current2,667
 970
 63
      
Deferred:     
Federal(27,382) 11,556
 7,621
State(1,052) 3,485
 1,685
Total deferred(28,434) 15,041
 9,306
Total (benefit) expense$(25,767) $16,011
 $9,369
Classification:     
Continuing operations$(27,524) $(20,047) $(1,959)
Discontinued operations$
 $
 $11,328
Gain on dispositions of real estate$1,757
 $36,058
 $
Consolidated income or loss subject to tax consists of pretax income or loss of our TRS entities and gains or losses on certain apartment community sales that are subject to income tax under section 1374 of the Internal Revenue Code. For the year ended December 31, 2015, our TRS entities had pretax losses of $31.3 million. For the years ended December 31, 2014 and 2013, our TRS entities had pretax income of $137.0 million and $46.6 million, respectively.
The reconciliation of income tax attributable to continuing and discontinued operations computed at the United States statutory rate to income tax (benefit) expense is shown below (dollars in thousands):
 2015 2014 2013
 Amount Percent Amount Percent Amount Percent
Tax at United States statutory rates on consolidated income or loss subject to tax$(10,947) 35.0 % $47,950
 35.0 % $16,326
 35.0 %
State income tax expense, net of Federal tax (benefit) expense(361) 1.2 % 4,364
 3.2 % 1,748
 3.7 %
Effect of permanent differences(27) 0.1 % (154) (0.1)% (296) (0.6)%
Tax effect of intercompany transfers of assets between the REIT and TRS entities (1)(1,515) 4.8 % (23,969) (17.5)% (4,272) (9.2)%
Tax credits(13,583) 43.4 % (12,271) (9.0)% (4,137) (8.9)%
Increase in valuation allowance666
 (2.1)% 91
 0.1 % 
  %
Total income tax (benefit) expense$(25,767) 82.4 % $16,011
 11.7 % $9,369
 20.0 %
(1)Includes the effect of intercompany asset transfers between the Aimco Operating Partnership and TRS entities, for which tax is deferred and recognized as the assets affect GAAP income or loss, for example, through depreciation, impairment, or upon the sale of the asset to a third party.
Income taxes paid totaled approximately $2.0 million, $1.7 million and $0.6 million, respectively, in the years ended December 31, 2015, 2014 and 2013, respectively.
At December 31, 2015, we had state net operating loss carryforwards, or NOLs, for which the deferred tax asset was approximately $8.0 million, before a valuation allowance of $4.5 million. The NOLs expire in years 2018 to 2032. Subject to certain separate return limitations, we may use these NOLs to offset a portion of state taxable income generated by our TRS entities. As of December 31, 2015, we had low-income housing and rehabilitation tax credit carryforwards of approximately $49.5 million for income tax purposes that expire in years 2024 to 2033. The deferred tax asset related to these credits is approximately $49.0 million.

F-32


For income tax purposes, dividends paid to holders of Common Stock primarily consist of ordinary income, capital gains, qualified dividends and unrecaptured Section 1250 gains, or a combination thereof. For the years ended December 31, 2015, 2014 and 2013, dividends per share held for the entire year were estimated to be taxable as follows:
 2015 2014 2013
 Amount Percentage Amount Percentage Amount Percentage
Ordinary income$0.36
 30.2% $0.01
 0.6% $0.17
 17.9%
Capital gains0.37
 31.3% 0.53
 51.6% 0.13
 13.9%
Qualified dividends0.17
 14.5% 
 % 
 %
Unrecaptured Section 1250 gain0.28
 24.0% 0.50
 47.8% 0.66
 68.2%
 $1.18
 100.0% $1.04
 100.0% $0.96
 100.0%
We designated the per share amounts above as capital gain dividends in accordance with the requirements under the Code. Additionally, we designated as 2015 capital gain dividends, a like portion of preferred dividends.
Note 96 — Aimco Equity
Preferred Stock
At December 31, 20152018 and 2014,2017, Aimco had the following classesa single class of perpetual preferred stock outstanding, (dollars in thousands):its Class A Cumulative Preferred Stock, with 5,000,000 shares authorized, issued and outstanding and with a balance of $125.0 million as of December 31, 2018 and 2017.
 Redemption 
Annual Dividend Rate Per Share
(paid quarterly)
 Balance December 31,
 Date (1)  2015 2014
Class A Cumulative Preferred Stock, 5,000,000 shares authorized and 5,000,000 shares issued/outstanding5/17/2019 6.88% $125,000
 $125,000
Class Z Cumulative Preferred Stock, 4,800,000 shares authorized and 1,391,643 shares issued/outstanding, respectively7/29/2016 7.00% 34,126
 34,126
Series A Community Reinvestment Act (CRA) Preferred Stock, 240 shares authorized and zero and 54 shares issued/outstanding, respectively6/30/2011 (2) 
 27,000
Preferred stock per consolidated balance sheets    $159,126
 $186,126
        
(1)All classes of preferred stock are or were redeemable at our option on and after the dates specified.
(2)The dividend rate was a variable rate per annum equal to the Three-Month LIBOR Rate (as defined in the articles supplementary designating the Series A Community Reinvestment Act Perpetual Preferred Stock, or CRA Preferred Stock) plus 1.25%, calculated as of the beginning of each quarterly dividend period. The rate at December 31, 2014 was 1.48%.
All classes of preferred stock haveAimco’s Class A Preferred Stock has a $0.01$0.01 per share par value, are pari passu with each other and areis senior to Aimco’s Common Stock, has a liquidation preference per share of $25.00 and is redeemable at our Common Stock.option on or after May 17, 2019. The holders of each class of preferred stockPreferred Stock are generally not entitled to vote on matters submitted to stockholders. Dividends on all sharesat an annual rate of preferred stock6.88% are subject to declaration by Aimco’s Board of Directors. Aimco’s Class A Preferred StockDirectors and Class Z Preferred Stock have liquidation preferences per share of $25.00.accrue if not declared.
The following table summarizes our issuances of Class A Preferred Stock and Class Z Preferred Stock during the year ended December 31, 2014 (dollars in thousands, except per share amounts):
 Class A Cumulative Preferred Stock Class Z Cumulative Preferred Stock
Number of shares of preferred stock issued5,000,000
 117,400
Price to public per share$25.00
 $25.65
Underwriting discounts, commissions and transaction costs per share$0.85
 $0.51
Net proceeds per share$24.15
 $25.14
Net proceeds to Aimco$120,757
 $2,901
Issuance costs (primarily underwriting commissions) recognized as an adjustment of additional paid-in capital$4,350
 $110
In connection with Aimco’s preferred stock issuances, Aimco contributed the net proceeds to the Aimco Operating Partnership in exchange for an equal number of the corresponding class of partnership preferred units. 

F-33


During the year ended December 31, 2015,2016, Aimco redeemed all of the remaining outstanding shares or $27.0 million in liquidation preference, of its CRAClass Z Cumulative Preferred Stock.Stock at a redemption value of $34.8 million. We reflected the $0.7 million excess of the redemption value over the carrying amount and $1.3 million of previously deferred issuance costs previously recorded as a reduction of additional paid-in capital as an adjustment of net income attributable to preferred stockholders for the year ended December 31, 2015. During the year ended December 31, 2014, Aimco repurchased 20 shares, or $10.0 million in liquidation preference, of its CRA Preferred Stock for cash totaling $9.5 million. We reflected the $0.5 million excess of the carrying value over the repurchase price, offset by $0.3 million of issuance costs previously recorded as a reduction of additional paid-in capital, as an adjustment of net income attributable to preferred stockholders for the year ended December 31, 2014. 2016.
In connection with the redemption and repurchase,of Aimco preferred stock, the Aimco Operating Partnership repurchasedredeemed from Aimco a number of Partnership Preferred Units equal to the number of shares redeemed or repurchased by Aimco.
Common Stock
During the yearyears ended December 31, 2015,2018, 2017 and 2016, Aimco issued 9,430,000declared dividends per common share of $1.52, $1.44 and $1.32, respectively.
On February 3, 2019, Aimco’s Board of Directors authorized a reverse stock split, in which every 1.03119 Aimco common share will be combined into one Aimco common share, effective at the close of business on February 20, 2019. On the same date, the Board of Directors also declared a special dividend on the Aimco common stock that consists of $67.1 million in cash and 4.5 million shares of its Common Stock, par value $0.01Aimco common stock. The special dividend will be payable on March 22, 2019, to stockholders of record as of February 22, 2019. The special dividend amount includes the regular quarterly cash dividend, which for 2019 is expected to be $0.39 per share. Stockholders will have the opportunity to elect to receive the special dividend in the form of all cash or all stock, subject to proration if either option is oversubscribed. The reverse split was authorized in order to neutralize the dilutive impact of the stock issued in the special dividend. As a result, total shares outstanding following completion of both the special dividend and the reverse stock split are expected to be unchanged from the total shares outstanding immediately prior to the transactions. Some stockholders may have more Aimco shares and some may have fewer based on their individual elections.
Pro forma Earnings per Share (unaudited)
In financial statements issued after the effective date of the reverse stock split, we are required to retroactively recognize the reverse stock split in the calculation of basic and diluted earnings per share. The shares issued in connection with the special dividend will be included in the calculation of basic and diluted earnings per share on a prospective basis, and are therefore not included in an underwritten public offering, for net proceedsthe pro forma amounts disclosed below. If the reverse stock split had been effective prior to issuance of these financial statements, basic and diluted weighted average shares outstanding and earnings per share of $38.90. The offering generated net proceeds to Aimco of $366.6 million, net of issuance costs.  Aimco contributedfor the net proceeds from the sale of Common Stock to the Aimco Operating Partnership in exchange for a number of common partnership units equal to the number of shares of Common Stock issued.
Using the proceeds from this offering, during the year endedyears ending December 31, 2015, we repaid the then outstanding balance on our Credit Agreement, expanded our unencumbered asset pool, funded redevelopment2018, 2017 and property upgrades investments that2016 would otherwise have been funded with property debt, and redeemed the remaining outstanding shares of our Series A CRA Preferred Stock.(shares in thousands):
 2018 2017 2016
Weighted average shares, basic151,152
 151,595
 151,282
Weighted average shares, diluted151,334
 152,060
 151,669
Basic earnings per share$4.34
 $2.02
 $2.76
Diluted earnings per share$4.34
 $2.02
 $2.75
Registration Statements
Pursuant to an At-The-Market offering program active at December 31, 2015, Aimco had the capacity to issue up to 3.5 million additional shares of its Common Stock. In the event of any such issuances by Aimco, the Aimco Operating Partnership would issue to Aimco a corresponding number of common partnership units in exchange for the proceeds.
Additionally, Aimco and the Aimco Operating Partnership have a shelf registration statement that provides for the issuance of debtequity and equitydebt securities by Aimco and debt securities by the Aimco Operating Partnership.

Note 107 — Partners’ Capital
Partnership Preferred Units Owned by Aimco
At December 31, 20152018 and 2014,2017, the Aimco Operating Partnership had outstanding preferred units in classes and amounts similar to Aimco’s Preferred Stock discusseddescribed in Note 96, or Partnership Preferred Units. All of these classes of Partnership Preferred Units were owned by Aimco during the periods presented.
All classes ofThe Partnership Preferred Units are pari passu with each other and are senior to the Aimco Operating Partnership’s common partnership units. None of the classes ofThe Partnership Preferred Units do not have any voting rights, except the right to approve certain changes to the Aimco Operating Partnership’s Partnership Agreement that would adversely affect holders of such class of units. Distributions on all Partnership Preferred Units are subject to being declared by the General Partner. All classes of theThe Partnership Preferred Units are redeemable by the Aimco Operating Partnership only in connection with a concurrent redemption by Aimco of the corresponding classes of Aimco Preferred Stock held by unrelated parties.
As discussed in Note 96, during the yearsyear ended December 31, 2015 and 2014,2016, Aimco completed variousredeemed its Class Z Cumulative Preferred Stock issuances, redemptions and repurchases.Stock. In connection with these transactions,this redemption, the Aimco Operating Partnership issued to Aimco or redeemed or repurchased from Aimco a corresponding number of Partnership Preferred Units.

F-34


Redeemable Partnership Preferred OP Units
In addition to the Partnership Preferred Units owned by Aimco, the Aimco Operating Partnership has outstanding various classes of redeemable Partnership Preferred Units owned by third parties, which we refer to as preferred OP Units. As of December 31, 20152018 and 2014,2017, the Aimco Operating Partnership had the following classes of preferred OP Units (stated at their redemption values, in thousands, except unit and per unit data):
 Distributions per Annum Units Issued and Outstanding Redemption ValuesDistributions per Annum Units Issued and Outstanding Redemption Values
Class of Preferred Units Percent Per Unit 2015 2014 2015 2014Percent Per Unit 2018 2017 2018 2017
Class One 8.75% $8.00
 90,000
 90,000
 $8,229
 $8,229
8.75% $8.00
 90,000
 90,000
 $8,229
 $8,229
Class Two 1.92% $0.46
 18,124
 18,589
 453
 465
1.92% $0.48
 14,240
 17,750
 356
 444
Class Three 7.88% $1.97
 1,341,289
 1,341,485
 33,532
 33,537
7.88% $1.97
 1,338,524
 1,338,524
 33,463
 33,462
Class Four 8.00% $2.00
 644,954
 644,954
 16,124
 16,124
8.00% $2.00
 644,954
 644,954
 16,124
 16,124
Class Six 8.50% $2.13
 790,883
 790,883
 19,772
 19,772
8.50% $2.13
 773,693
 780,036
 19,342
 19,501
Class Seven 7.87% $1.97
 27,960
 27,960
 699
 699
7.87% $1.97
 27,960
 27,960
 699
 699
Class Nine 6.00% $1.50
 364,668
 364,668
 9,117
 9,117
6.00% $1.50
 243,112
 243,112
 6,078
 6,078
Class Ten6.00% $1.50
 680,000
 680,000
 17,000
 17,000
Total     3,277,878
 3,278,539
 $87,926
 $87,943
    3,812,483
 3,822,336
 $101,291
 $101,537
Each class of preferred OP UnitUnits is currently redeemable at the holders’ option. The Aimco Operating Partnership, at its sole discretion, may settle such redemption requests in cash or cause Aimco to issue shares of its Common Stock with a value equal to the redemption price. In the event the Aimco Operating Partnership requires Aimco to issue shares of Common Stock to settle a redemption request, the Aimco Operating Partnership would issue to Aimco a corresponding number of common partnership units. The Aimco Operating Partnership has a redemption policy that requires cash settlement of redemption requests for the redeemable preferred OP Units, subject to limited exceptions. Subject to certain conditions, the Class Four and Class Six preferred OP Units are convertiblemay be converted into common OP Units.
These redeemable units are classified within temporary equity in Aimco’s consolidated balance sheets and within temporary capital in the Aimco Operating Partnership’s consolidated balance sheets.
During the years ended December 31, 2015, 20142018, 2017 and 2013,2016, approximately 700, 12,60010,000, 67,000 and 3,60069,000 preferred OP Units, respectively, were tendered for redemptionredeemed in exchange for cash, and no preferred OP Units were tendered for redemptionredeemed in exchange for shares of Aimco Common Stock.
The Class NineTen preferred OP Units were issued as partial consideration for an asset acquisition during the year ended December 31, 2014.2016.

The following table presents a reconciliation of the Aimco Operating Partnership’s preferred OP Units during the years ended December 31, 2015, 20142018, 2017 and 2013 (dollars in2016 (in thousands).:
2015 2014 20132018 2017 2016
Balance at January 1$87,937
 $79,953
 $80,046
$101,537
 $103,201
 $87,926
Preferred distributions(6,943) (6,409) (6,423)(7,740) (7,764) (7,239)
Redemption of preferred units and other(11) (1,221) (93)(246) (1,664) (1,725)
Issuance of preferred units
 9,117
 

 
 17,000
Net income6,943
 6,497
 6,423
7,740
 7,764
 7,239
Balance at December 31$87,926
 $87,937
 $79,953
$101,291
 $101,537
 $103,201
Common Partnership Units
In the Aimco Operating Partnership’s consolidated balance sheets, the common partnership units held by Aimco are classified within Partners’ Capital as General Partner and Special Limited Partner capital and the common OP Units are classified within Limited Partners’ capital. In Aimco’s consolidated balance sheets, the common OP Units are classified within permanent equity as common noncontrolling interests in the Aimco Operating Partnership.
Common partnership units held by Aimco are not redeemable. Commonredeemable whereas common OP Units are redeemable at the holders’ option, subject to certain restrictions, on the basis of one common OP Unit for either one share of Common Stock or cash equal to the fair value

F-35


of a share of Common Stock at the time of redemption. Aimco has the option to deliver shares of Common Stock in exchange for all or any portion of the common OP Units tendered for redemption. When a limited partner redeems a common OP Unit for Common Stock, Limited Partners’ capital is reduced and the General Partner and Special Limited Partners’ capital is increased.
During the years ended December 31, 2018, 2017 and 2016, approximately 224,000, 268,000 and 248,000 common OP Units, respectively, were redeemed in exchange for cash, and no common OP Units were redeemed in exchange for shares of Common Stock.
The holders of the common OP Units receive distributions, prorated from the date of issuance, in an amount equivalent to the dividends paid to holders of Common Stock.
During the years ended December 31, 2015, 20142018, 2017 and 2013, approximately 112,000, 268,000 and 105,000 common OP Units, respectively, were redeemed in exchange for cash, and no common OP Units were redeemed in exchange for shares of Common Stock.
HPUs
At December 31, 2015 and 2014,2016, the Aimco Operating Partnership had outstanding 2,339,950 HPUs. The holdersdeclared distributions per common unit of HPUs may redeem these units commencing after December 31, 2016, on$1.52, $1.44 and $1.32, respectively
On February 3, 2019, the basisBoard of one HPU for either one shareDirectors of Common Stock or cash equal to the fair value of a share of Common Stock at the time of redemption, at Aimco’s option. The holders of HPUs receive the same amount of distributions that are paid to holders of an equivalent number of common OP Units. The HPUs are classified within permanent capital as part of Limited Partners’ capital in the Aimco Operating Partnership’s consolidated balance sheets,general partner authorized a reverse unit split in which every 1.03119 common partnership units will be combined into one common partnership unit. The reverse split is effective at the close of business on February 20, 2019, and within permanent equity as partcorresponds to a similar split effected by Aimco with respect to its common shares at the same time. On the same date, the Board of common noncontrolling interests inDirectors also declared a special distribution to the holders of Aimco Operating Partnership within Aimco’s consolidated balance sheets.common partnership units that consists of $71.5 million in cash and 4.8 million common partnership units. The special distribution will be payable on March 22, 2019, to unitholders of record as of February 22, 2019. The special distribution also corresponds to a similar special dividend paid at the same time to holders of Aimco common shares. The reverse split was authorized in order to neutralize the dilutive impact of the units issued in the special distribution. As a result, total common partnership units outstanding following completion of both the special distribution and the reverse unit split are expected to be unchanged from the total common partnership units outstanding immediately prior to the transactions.
Pro forma Earnings per Common Unit (Unaudited)
In financial statements issued after the effective date of the reverse unit split, we are required to retroactively recognize the reverse unit split in the calculation of basic and diluted earnings per unit. The units issued in connection with the special distribution will be included in the calculation of basic and diluted earnings per unit on a prospective basis, and are therefore not included in the pro forma amounts disclosed below. If the reverse unit split had been effective prior to issuance of these financial statements, basic and diluted weighted average units outstanding and earnings per unit for the years ending December 31, 2018, 2017 and 2016 would have been (units in thousands):
 2018 2017 2016
Weighted average units, basic158,890
 158,793
 158,808
Weighted average units, diluted159,073
 159,257
 159,194
Basic earnings per unit$4.35
 $2.02
 $2.76
Diluted earnings per unit$4.34
 $2.02
 $2.75

Note 118 — Share-Based Compensation
We have a stock award and incentive planprogram to attract and retain officers key employees and independent directors. In 2015,As of December 31, 2018, approximately 4.7 million shares were available for issuance under our stockholders approved theAmended and Restated 2015 Stock Award and Incentive Plan, or the 2015 Plan, to supplement and eventually replace our 2007 Stock Award and Incentive Plan, or the 2007 Plan.  
As of December 31, 2015, approximately 150,000 shares were available for issuance under the 2007 Plan, and approximately 1.6 million shares were available for issuance under the 2015 Plan. The total number of shares available for issuance under the 2015 Planthis plan may be increased by an additional 2.30.3 million shares to the extent of any forfeiture, cancellation, exchange, surrender, termination or expiration of an award outstanding under theour 2007 Stock Award and Incentive Plan. Awards under the 2015 Plan may be in the form of incentive stock options, non-qualified stock options and restricted stock, or other types of awards as authorized under the plan.
Our plans are administered by the Compensation and Human Resources Committee of Aimco’s Board of Directors. In the case of stock options, the exercise price of the options granted may not be less than the fair market value of a share of Common Stock at the date of grant. The term of the options is generally ten years from the date of grant and the options typically vest over a period of four years from the date of grant.
Total compensation cost recognized for stock based awards was $7.2$9.7 million, $6.1$9.3 million and $5.9$8.6 million for the years ended December 31, 2015, 20142018, 2017 and 2013,2016, respectively. Of these amounts, $0.5$1.2 million, $0.3$1.4 million and $0.3$1.0 million, respectively, were capitalized. At December 31, 2015,2018, total unvested compensation cost not yet recognized was $11.3$11.0 million. We expect to recognize this compensation over a weighted average period of approximately 1.81.6 years.
We have granted five different types of awards that are outstanding as of December 31, 2018. We have outstanding stock options and restricted stock awards that are subject to time-based vesting and require continuous employment, typically over a period of four years from the grant date, and we refer to these awards as Time-Based Stock Options and Time-Based Restricted Stock, respectively. We also have outstanding stock options, restricted stock awards and two forms of long-term incentive partnership units, or LTIP units, that vest conditioned on Aimco’s total shareholder return, or TSR, relative to the NAREIT Apartment Index (60% weighting) and the MSCI US REIT Index (40% weighting) over a forward-looking performance period of three years. We refer to these awards as TSR Stock Options, TSR Restricted Stock, TSR LTIP I units, and TSR LTIP II units. Vested LTIP II units may be converted at the holders option to LTIP Units for a strike price over a term of ten years. Earned TSR-based awards, if any, will vest 50% on each of the third anniversary and fourth anniversary of the grant date, based on continued employment. The term of Time-Based Stock Options and TSR Stock Options is generally ten years from the date of grant.
We recognize compensation cost associated with Time-Based awards ratably over the requisite service periods, which are typically four years. We recognize compensation cost related to the TSR-based awards, which have graded vesting periods, over the requisite service period for each separate vesting tranche of the award, commencing on the grant date. The value of the TSR-based awards take into consideration the probability that the market condition will be achieved; therefore previously recorded compensation cost is not adjusted in the event that the market condition is not achieved and awards do not vest.
Stock Options
During the years ended December 31, 2018, 2017 and 2016, we granted TSR Stock Options.
The following table summarizes activity for our outstanding stock options, with service conditions (i.e. time-based vesting that requires continuous employment) for the years ended December 31, 2015, 20142018, 2017 and 2013 (numbers of options2016 (options in thousands):
2015 2014 20132018 2017 2016
Number of Options Weighted
Average
Exercise
Price
 Number of Options Weighted
Average
Exercise
Price
 Number of Options Weighted
Average
Exercise
Price
Number of Options Weighted
Average
Exercise
Price
 Number of Options Weighted
Average
Exercise
Price
 Number of Options Weighted
Average
Exercise
Price
Outstanding at beginning of year1,640
 $28.91
 2,991
 $28.48
 3,045
 $28.39
648
 $40.08
 675
 $29.55
 1,394
 $30.85
Granted239
 39.05
 
 
 
 

 
 184
 44.07
 216
 38.73
Exercised(484) 28.33
 (1,347) 27.97
 (44) 22.52
(2) 28.33
 (211) 9.90
 (934) 33.61
Forfeited(1) 25.78
 (4) 25.45
 (10) 27.82

 
 
 
 (1) 29.11
Outstanding at end of year1,394
 $30.85
 1,640
 $28.91
 2,991
 $28.48
646
 $40.12
 648
 $40.08
 675
 $29.55
Exercisable at end of year1,155
 $29.16
 1,640
 $28.91
 2,991
 $28.48
186
 $38.18
 128
 $37.59
 280
 $16.38

F-36


The intrinsic value of a stock option represents the amount by which the current price of the underlying stock exceeds the exercise price of the option. Options outstanding at As of December 31, 2015,2018, options outstanding had an aggregate intrinsic value of $13.6$2.5 million and a weighted average remaining contractual term of 3.27.0 years. Options exercisable at December 31, 2015,2018, had an aggregate intrinsic value of $13.4$1.1 million and a weighted average remaining contractual term of 2.05.9 years. The intrinsic value of stock options exercised during the years ended December 31, 2015, 20142018, 2017 and 2013,2016, was $5.5$32 thousand, $7.1 million $10.0and $11.1 million, and $0.3 million, respectively.
We estimated the
The weighted average grant date fair value of stock options granted during the yearyears ended December 31, 2015 using a Black-Scholes closed-form valuation model using the assumptions set forth in the table below. The expected term of the options2017 and 2016 was based on historical$11.39 and $9.94 per option, exercises and post-vesting terminations. Expected volatility reflects an average of the historical volatility of our Common Stock during the historical period commensurate with the expected term of the options that ended on the date of grant, and the implied volatility is calculated from observed call option contracts closest to the expected term. The expected dividend yield reflects expectations regarding cash dividend amounts per share paid on Aimco’s Common Stock during the expected term of the option and the risk-free interest rate reflects the annualized yield of a zero coupon U.S. Treasury security with a term equal to the expected term of the option. The weighted average fair value of options and our valuation assumptions for the 2015 grants were as follows:
 2015
Weighted average grant-date fair value$6.97
Assumptions: 
Risk-free interest rate1.68%
Expected dividend yield2.87%
Expected volatility25.19%
Weighted average expected life of options5.5 years
We recognize compensation expense associated with stock options ratably over the requisite service periods, which are typically four years.respectively.
Time-Based Restricted Stock Awards
The following table summarizes activity for restricted stock awards with service conditions, or Time-Based Restricted Stock awards for the years ended December 31, 2015, 20142018, 2017 and 2013 (numbers of shares2016 (shares in thousands):
2015 2014 20132018 2017 2016
Number of Shares Weighted
Average
Grant-Date
Fair Value
 Number of Shares Weighted
Average
Grant-Date
Fair Value
 Number of Shares Weighted
Average
Grant-Date
Fair Value
Number of Shares Weighted
Average
Grant-Date
Fair Value
 Number of Shares Weighted
Average
Grant-Date
Fair Value
 Number of Shares Weighted
Average
Grant-Date
Fair Value
Unvested at beginning of year513
 $26.34
 575
 $25.28
 526
 $22.69
160
 $37.63
 249
 $33.61
 339
 $29.96
Granted145
 39.39
 196
 26.69
 253
 27.86
51
 40.01
 45
 44.07
 91
 40.03
Vested(259) 27.54
 (238) 24.07
 (204) 21.81
(86) 34.42
 (134) 32.35
 (181) 29.99
Forfeited(60) 32.29
 (20) 26.26
 
 
Unvested at end of year339
 $29.96
 513
 $26.34
 575
 $25.28
125
 $40.82
 160
 $37.63
 249
 $33.61
The aggregate fair value of shares that vested during the years ended December 31, 2015, 20142018, 2017 and 20132016 was $10.4$8.4 million, $6.7$6.0 million and $5.7$7.0 million,, respectively.
We recognize compensation expense associated with Time-Based Restricted Stock awards ratably over the requisite service periods, which are typically four years.
TSR Restricted Stock Awards
During 2015, Aimco’s stockholders approved the 2015 Plan, which provides for grants of performance based compensation. A portion of long-term incentive, or LTI, compensation granted in 2015 was in the form of restricted stock awards conditioned on Aimco’s relative total shareholder return, or TSR, as compared to the NAREIT Apartment Index (60% weighting) and the MSCI US REIT Index (40% weighting) over a forward looking, performance period of three years.
Earned awards (if any) will vest 50% on the third anniversary of the grant date and 50% on the fourth anniversary of the grant date, based on continued employment. Prior to the vesting, dividends payable on the awards are deferred and subject to the same forfeiture provisions as the awards.

F-37


The following table summarizes activity for TSR Restricted Stock awards for the yearyears ended December 31, 2015 (numbers of shares2018, 2017 and 2016 (shares in thousands):
20152018 2017 2016
Number of Shares Weighted
Average
Grant-Date
Fair Value
Number of Shares Weighted
Average
Grant-Date
Fair Value
 Number of Shares Weighted
Average
Grant-Date
Fair Value
 Number of Shares Weighted
Average
Grant-Date
Fair Value
Unvested at beginning of year
 $
253
 $40.70
 214
 $39.66
 123
 $39.72
Granted142
 39.72
45
 41.71
 39
 46.39
 91
 39.59
Forfeited(19) 39.72
Vested(123) 39.72
 
 
 
 
Unvested at end of year123
 $39.72
175
 $41.65
 253
 $40.70
 214
 $39.66
TSR LTIP I Units
The following table summarizes activity for TSR LTIP I units for the years ended December 31, 2018 and 2017 (units in thousands):
 2018 2017
 Number of Units Weighted
Average
Grant-Date
Fair Value
 Number of Units Weighted
Average
Grant-Date
Fair Value
Unvested at beginning of year45
 $46.21
 
 $
Granted48
 41.48
 45
 46.21
Unvested at end of year93
 $43.78
 45
 $46.21

TSR LTIP II Units
The following table summarizes activity for TSR LTIP II units for the years ended December 31, 2018 and 2017 (numbers of units in thousands):
 2018
 Number of Units Weighted
Average
Grant-Date
Fair Value
Unvested at beginning of year
 $
Granted243
 41.84
Unvested at end of year243
 $41.84
Determination of Grant-Date Fair Value of Awards
We estimated the fair value of TSR-based awards granted in 2018, 2017 and 2016 using a Monte Carlo model using the assumptions set forth in the table below.
The risk-free interest rate reflects the annualized yield of a zero coupon U.S. Treasury security with a term equal to the expected term of the option. The expected dividend yield reflects expectations regarding cash dividend amounts per share paid on Aimco’s Common Stock during the expected term of the awards. Expected volatility reflects an average of the historical volatility of Aimco’s Common Stock during the historical period commensurate with the expected term of the options that ended on the date of grant, and the implied volatility is calculated from observed call option contracts closest to the expected term. The derived vesting period of TSR Restricted Stock and TSR LTIP I units was determined based on the graded vesting terms. The expected term of the TSR-options and TSR LTIP II units was based on historical option exercises and post-vesting terminations. The midpoints of our valuation assumptions for the 2018, 2017 and 2016 grants were as follows:
 2018 2017 2016
Grant date market value of a common share$40.95
 $44.07

$38.73
Risk-free interest rate2.32% 1.57%
1.15%
Dividend yield3.52% 3.27%
3.41%
Expected volatility18.02% 21.33%
21.24%
Derived vesting period of TSR Restricted Stock and TSR LTIP I units3.4 years
 3.4 years

3.4 years
Weighted average expected term of TSR Stock Options and LTIP II units5.6 years
 5.8 years
 5.8 years
The grant date fair value for the TSRTime-Based Restricted Stock awards which was calculated usingreflects the closing price of a Monte Carlo model, and certainshare of the assumptions used in such calculation for awards granted in 2015 are set forth below:
  2015
Grant date fair value $39.72
Baseline common share value $39.05
Dividend yield 2.87%
Expected volatility of common shares 19.48%
Risk-free interest rate 1.04%
Derived vesting period 3.4 years
We recognize compensation expense related to the TSR Restricted Stock awards, which have graded vesting periods, over the requisite service period for each separate vesting tranche of the award, commencingAimco common stock on the grant date. These awards have market conditions

Note 9 — Income Taxes
Deferred income taxes reflect the net effects of temporary differences between the carrying amounts of assets and liabilities of the TRS entities for financial reporting purposes and the amounts used for income tax purposes. Significant components of our deferred tax liabilities and assets are as follows (in thousands):
 December 31,
 2018 2017
Deferred tax liabilities:   
Real estate and real estate partnership basis differences$12,058
 $32,032
Deferred tax assets:   
Net operating, capital and other loss carryforwards$7,022
 $9,523
Accruals and expenses7,432
 6,575
Tax credit carryforwards67,530
 73,450
Management contracts and other2,064
 200
Total deferred tax assets84,048
 89,748
Valuation allowance(4,930) (25,489)
Net deferred tax assets$67,060
 $32,227
In December 2017, the U.S. Congress passed the Tax Cuts and Jobs Act, or the 2017 Act, which is effective for years beginning with 2018. The 2017 Act provided for a reduction in addition to service conditions that must be metthe federal income tax rate. In accordance with GAAP, we revalued our deferred tax assets and liabilities as of December 31, 2017. We finalized our accounting for the awards to vest. The valuetax effects of enactment of the awards takes into consideration the probability that the awards will ultimately vest; therefore previously recorded compensation expense is not adjusted in the event that the market condition is not achieved.
Note 12 — Assets Held for Sale and Discontinued Operations
As discussed in Note 2,2017 Act during the year ended December 31, 2014,2018, resulting in our recognition of a cumulative net tax benefit of $15.6 million over the two years.
At December 31, 2018, we adopted ASU 2014-08,had federal and state net operating loss carryforwards, or NOLs, for which revised the definitiondeferred tax asset was approximately $7.0 million, before a valuation allowance of $4.9 million. The NOLs expire in years 2019 to 2034. Subject to certain separate return limitations, we may use these NOLs to offset a portion of state taxable income generated by our TRS entities.
As of December 31, 2018, we had low-income housing and rehabilitation tax credit carryforwards and corresponding deferred tax assets of approximately $67.5 million for income tax purposes that expire in years 2034 to 2038. In light of the requirements for reporting,lower federal tax rate under the 2017 Act, our TRS entities must generate more taxable income in future years to utilize tax credit carryforwards, which are recorded as deferred tax assets. As a “discontinued operation.” Under ASU 2014-08, we believe routine sales of apartment communities and certain groups of apartment communities generally will not meet the requirements for reporting within discontinued operations. Summarized information regarding apartment communities soldresult, during the yearsyear ended December 31, 20152017, we recognized a partial valuation allowance of $15.4 million against the deferred tax assets associated with low-income housing and 2014rehabilitation tax credit carryforwards. Due to the sale of our Asset Management business, discussed further in Note 3, during the year ended December 31, 2018, we reversed the remaining valuation allowance recognized in 2017 against our deferred tax benefits that we now expect to utilize.
A reconciliation of the beginning and ending balance of our unrecognized tax benefits is set forth in the tablepresented below (dollars in(in thousands):
 Year Ended December 31,
 2015 2014
Apartment communities sold11
 30
Apartment homes sold3,855
 9,067
Income before income taxes and discontinued operations$14,191
 $55,122
 2018 2017 2016
Balance at January 1$2,476
 $2,286
 $2,897
Additions (reductions) based on tax positions related to prior years142
 190
 (611)
Balance at December 31$2,618
 $2,476
 $2,286
The resultsBecause the statute of operationslimitations has not yet elapsed, our United States federal income tax returns for the yearsyear ended December 31, 20152014 and subsequent years and certain of our State income tax returns for the year ended December 31, 2014 and subsequent years are currently subject to examination by the IRS or other taxing authorities. If recognized, the unrecognized benefit would affect the effective rate.
In 2014, the IRS initiated an audit of the apartment communities sold during these periods are reflectedAimco Operating Partnership’s 2011 and 2012 tax years. This audit remains in process as of December 31, 2018. We do not believe the audit will have any material effect on our unrecognized tax benefits, financial condition or results of operations.
Our policy is to include any interest and penalties related to income taxes within the income from continuing operationstax line item in our consolidated statements of operationsoperations.

In accordance with the accounting requirements for stock-based compensation, we may recognize tax benefits in connection with the exercise of stock options by employees of our TRS entities and the vesting of restricted stock awards. We recognize the tax effects related gainsto stock based compensation through earnings in the period the compensation was recognized.
Significant components of the income tax benefit or expense are as follows and are classified within income tax benefit in income before gain on sale are reflected asdispositions and gain on dispositions of real estate, net of tax, withinin our consolidated statements of operations. We report gains on disposition net of incremental direct costs incurred in connection with the transactions, including any prepayment penalties incurred upon repayment of property debt collateralized by the apartment communities being sold. Such prepayment penalties totaled $25.8 million for consolidated dispositions during the year ended December 31, 2015 ($16.6 million of which represented the mark-to-market adjustment), and $25.2 million for consolidated dispositions during the year ended December 31, 2014 ($16.6 million of which represented the mark-to-mark adjustments).
We are currently marketing for sale certain apartment communities that are inconsistent with our long-term investment strategy. At the end of each reporting period, we evaluate whether such apartment communities meet the criteria to be classified as held for sale. As of December 31, 2015, we had one apartment community with 96 apartment homes classified as held for sale.

F-38


In accordance with GAAP prior to our adoption of ASU 2014-08, we reported as discontinued operations apartment communities that met the definition of a component of an entity and had been sold or met the criteria to be classified as held for sale. For the year ended December 31, 2013, we included the results of such apartment communities, including any gain or loss on their disposition, less applicable income taxes, in income from discontinued operations within the consolidated statements of operations. During the year ended December 31, 2013, we sold 29 consolidated apartment communities with an aggregate of 6,953 apartment homes.
The summary results of operations for the year ended December 31, 2013, for those apartment communities sold as of December 31, 2013, and gains related to apartment communities sold during the year ended December 31, 2013, are included in discontinued operations and are summarized below, along with the related amounts of income from discontinued operations attributable to Aimco, the Aimco Operating Partnership and noncontrolling interests (in thousands).
 2013
Income before gain on dispositions of real estate and income tax$2,098
Gain on dispositions of real estate212,459
Income tax expense(11,328)
Income from discontinued operations, net of tax$203,229
Income from discontinued operations attributable to noncontrolling interests in consolidated real estate partnerships(31,842)
Income from discontinued operations attributable to the Aimco Operating Partnership$171,387
Income from discontinued operations attributable to noncontrolling interests in Aimco Operating Partnership(9,248)
Income from discontinued operations attributable to Aimco$162,139
Gain on dispositions is net of incremental direct costs incurred in connection with the transactions, including $16.5 million of prepayment penalties incurred upon repayment of property debt collateralized by the apartment communities sold in the year ended December 31, 2013 ($6.1 million of which represented the mark-to-market adjustments). For periods prior to our adoption of ASU 2014-08, we classified interest expense related to property debt within discontinued operations when the related apartment community was sold or classified as held for sale.

F-39


Note 13 — Earnings (Loss) per Share/Unit
Aimco
The following table illustrates Aimco’s calculation of basic and diluted earnings (loss) per share for the years ended December 31, 2015, 20142018, 2017 and 20132016 (in thousands, except per share data)thousands):
 2015 2014 2013
Numerator:     
Income from continuing operations$91,390
 $67,475
 $34,596
Gain on dispositions of real estate, net of tax180,593
 288,636
 
(Income) loss from continuing operations and gain on dispositions attributable to noncontrolling interests(23,273) (46,862) 10,555
Income attributable to preferred stockholders(11,794) (7,947) (2,804)
Income attributable to participating securities(950) (1,082) (813)
Income from continuing operations attributable to Aimco common stockholders$235,966
 $300,220
 $41,534
      
Income from discontinued operations, net of tax$
 $
 $203,229
Income from discontinued operations attributable to noncontrolling interests
 
 (41,090)
Income from discontinued operations attributable to Aimco common stockholders$
 $
 $162,139
      
Net income$271,983
 $356,111
 $237,825
Net income attributable to noncontrolling interests(23,273) (46,862) (30,535)
Net income attributable to preferred stockholders(11,794) (7,947) (2,804)
Net income attributable to participating securities(950) (1,082) (813)
Net income attributable to Aimco common stockholders$235,966
 $300,220
 $203,673
      
Denominator:     
Weighted average common shares outstanding – basic155,177
 145,639
 145,291
Dilutive potential common shares393
 363
 241
Weighted average common shares outstanding – diluted155,570
 146,002
 145,532
      
Earnings per common share – basic and diluted:     
Income from continuing operations attributable to Aimco common stockholders$1.52
 $2.06
 $0.29
Income from discontinued operations attributable to Aimco common stockholders
 
 1.11
Net income attributable to Aimco common stockholders$1.52
 $2.06
 $1.40
      
Dividends declared per common share$1.18
 $1.04
 $0.96
 2018 2017 2016
Current:     
Federal$11,269
 $(938) $5,038
State10,537
 525
 2,916
Total current21,806
 (413) 7,954
      
Deferred:     
Federal(29,243) (10,908) (26,173)
State(5,590) (3,621) (623)
Revaluation of deferred taxes due to change in tax rate
 (15,894) 
Total deferred(34,833) (30,423) (26,796)
Total benefit$(13,027) $(30,836) $(18,842)

F-40


The Aimco Operating Partnership
The following table illustratespretax income or loss of our TRS entities and income and gains retained by the Aimco Operating Partnership’s calculation of basic and diluted earnings per common unit forREIT. For the years ended December 31, 2015, 20142018, 2017 and 2013 (in thousands, except per unit data)2016, we had consolidated net income subject to tax of $158.6 million, net loss subject to tax of $55.6 million and net income subject to tax of $109.3 million, respectively.
The reconciliation of income tax attributable to operations computed at the United States statutory rate to income tax benefit is shown below (dollars in thousands):
 2015 2014 2013
Numerator:     
Income from continuing operations$91,390
 $67,475
 $34,596
Gain on dispositions of real estate, net of tax180,593
 288,636
 
(Income) loss from continuing operations and gain on dispositions attributable to noncontrolling interests(4,776) (24,595) 19,369
Income attributable to the Aimco Operating Partnership’s preferred unitholders(18,737) (14,444) (9,227)
Income attributable to participating securities(950) (1,082) (813)
Income from continuing operations attributable to the Aimco Operating Partnership’s common unitholders$247,520
 $315,990
 $43,925
      
Income from discontinued operations, net of tax$
 $
 $203,229
Income from discontinued operations attributable to noncontrolling interests
 
 (31,842)
Income from discontinued operations attributable to the Aimco Operating Partnership’s common unitholders$
 $
 $171,387
      
Net income$271,983
 $356,111
 $237,825
Net income attributable to noncontrolling interests(4,776) (24,595) (12,473)
Net income attributable to the Aimco Operating Partnership’s preferred unitholders(18,737) (14,444) (9,227)
Net income attributable to participating securities(950) (1,082) (813)
Net income attributable to the Aimco Operating Partnership’s common unitholders$247,520
 $315,990
 $215,312
      
Denominator:     
Weighted average common units outstanding – basic162,834
 153,363
 153,256
Dilutive potential common units393
 363
 241
Weighted average common units outstanding – diluted163,227
 153,726
 153,497
      
Earnings per common unit – basic and diluted:     
Income from continuing operations attributable to the Partnership’s common unitholders$1.52
 $2.06
 $0.29
Income from discontinued operations attributable to the Partnership’s common unitholders
 
 1.11
Net income attributable to the Partnership’s common unitholders$1.52
 $2.06
 $1.40
      
Distributions declared per common unit$1.18
 $1.04
 $0.96
 2018 2017 2016
 Amount Percent Amount Percent Amount Percent
Tax provision (benefit) at United States statutory rates on consolidated income or loss subject to tax$33,296
 21.0 % $(19,459) 35.0 % $38,257
 35.0 %
State income tax expense, net of federal tax (benefit) expense12,252
 7.7 % (1,769) 3.2 % 7,152
 6.5 %
Establishment of deferred tax asset related to partnership basis difference (1)
  % (3,501) 6.3 % 
  %
Effect of permanent differences302
 0.2 % (1,629) 2.9 % (132) (0.1)%
Tax effect of intercompany transactions (2)(33,250) (21.0)% 
  % (47,369) (43.3)%
Tax credits(6,897)
(4.4)% (9,607) 17.3 % (16,750) (15.3)%
Tax reform revaluation (3)288

0.2 % (15,894) 28.6 % 
  %
(Decrease) increase in valuation allowance (4)(20,434)
(12.9)% 21,023
 (37.8)% 
  %
Other1,416

0.9 % 
  % 
  %
Total income tax benefit$(13,027) (8.3)% $(30,836) 55.5 % $(18,842) (17.2)%
(1)2017 includes the establishment of a deferred tax asset related to partnership basis difference when it became apparent that it would reverse in the foreseeable future. This deferred tax asset was fully reserved in the valuation allowance described below as of December 31, 2017.
(2)2016 includes the effect of intercompany asset transfers between the Aimco Operating Partnership and TRS entities, for which tax was deferred and recognized as the assets affected GAAP income or loss, for example, through depreciation, impairment, or upon the sale of the asset to a third-party. Effective January 1, 2017, we adopted a new accounting standard applicable to intercompany asset transfers. As a result, the accumulated unrecognized deferred tax expense associated with historical intercompany transfers was recognized as a cumulative effect adjustment through retained earnings at that time. 2018 includes the tax benefit to establish the initial deferred tax asset from the intercompany transfer of a portion of the Asset Management business between the Aimco Operating Partnership and TRS entities.
(3)Reflects revaluation of deferred tax assets and liabilities using the TRS entities’ lower effective tax rates resulting from the 2017 Act. Accounting for the tax effects of enactment of the 2017 Act was finalized during the year ended December 31, 2018.

(4)2017 includes a $15.4 million valuation allowance against the deferred tax assets associated with rehabilitation tax credits due to the lower federal tax rate under the 2017 Act. This valuation allowance was reversed in 2018 as a result of the sale of our Asset Management business.
Income taxes paid totaled approximately $11.5 million, $7.4 million and $2.2 million in the years ended December 31, 2018, 2017 and 2016, respectively.
For income tax purposes, dividends paid to holders of Common Stock primarily consist of ordinary income, capital gains, qualified dividends and unrecaptured Section 1250 gains, or a combination thereof. For the years ended December 31, 2018, 2017 and 2016, dividends per share held for the entire year were estimated to be taxable as follows:
 2018 2017 2016
 Amount Percentage Amount Percentage Amount Percentage
Ordinary income$0.51
 33.4% $0.75
 51.5% $0.45
 34.2%
Capital gains0.93
 61.2% 0.51
 35.7% 0.47
 35.4%
Qualified dividends
 % 0.02
 1.6% 0.13
 9.9%
Unrecaptured Section 1250 gain0.08
 5.4% 0.16
 11.2% 0.27
 20.5%
 $1.52
 100.0% $1.44
 100.0% $1.32
 100.0%
Note 10 — Earnings per Share/Unit
Aimco and the Aimco Operating Partnership
As of December 31, 2015, the common share or unit equivalents that could potentially dilute calculate basic earnings per common share orand basic earnings per common unit in future periods totaled 1.4 million. Thesebased on the weighted average number of shares of Common Stock and common partnership units and participating securities representoutstanding, and calculate diluted earnings per share and diluted earnings per unit taking into consideration dilutive common stock and common partnership unit equivalents and dilutive convertible securities outstanding during the period.
Our common stock equivalents and common partnership unit equivalents include options to purchase shares of Common Stock, which, if exercised, would result in Aimco’s issuance of additional shares and the Aimco Operating Partnership’s issuance to Aimco of additional common partnership units equal to the number of shares purchased under the options. These equivalents also include unvested TSR Restricted Stock awards that do not meet the definition of participating securities, which would result in the issuance of additional common shares and common partnership units equal to the number of shares that vest. The dilutive effect of these securities was dilutive0.2 million shares or units, 0.5 million shares or units, and 0.4 million shares or units, respectively, for the years ended December 31, 2015, 20142018, 2017 and 2013, and accordingly has been2016. Securities with dilutive effect are included in the denominator for calculating diluted earnings per share and unit during these periods. Participating securities, consisting primarily of unvested time-basedThere were 0.3 million potential shares and 0.3 million potential units not dilutive and excluded from the denominator for calculating diluted earnings per share and per unit, respectively, for the year ended December 31, 2018. There were 0.2 million potential shares and 0.2 million potential units not dilutive and excluded from the denominator for calculating diluted earnings per share and per unit, respectively, for the years ended December 31, 2017 and 2016.
Our Time-Based Restricted Stock awards of restricted shares of Common Stock, receive dividends similar to shares of Common Stock and common partnership units prior to vesting and totaled 0.3 million, 0.5 millionour TSR LTIP I units and 0.6 million at December 31, 2015, 2014TSR LTIP II units receive distributions based on specified percentages of the distributions paid to common partnership units prior to vesting and 2013, respectively.conversion. These dividends and distributions are not forfeited in the event the awards do not vest. Therefore, the unvested restricted shares and units related to these awards are participating securities. The effect of participating securities is included in basic and diluted earnings (loss) per share and unit computations for the periods presented above using the two-class method of allocating distributed and undistributed earnings.

F-41

Tableearnings when the two-class method is more dilutive than the treasury stock method. At December 31, 2018, 2017 and 2016, there were 0.3 million, 0.2 million and 0.2 million shares of Contentsunvested participating restricted securities, respectively. At December 31, 2018, 2017 and 2016, there were 0.6 million, 0.3 million and 0.2 million units of unvested participating restricted securities, respectively.

As discussed in Note 107, the Aimco Operating Partnership has various classes of preferred OP Units, which may be redeemed at the holders’ option. The Aimco Operating Partnership may redeem these units for cash, or at its option, shares of Common Stock. As of December 31, 2015,2018, these preferred OP Units were potentially redeemable for approximately 2.22.3 million shares of Common Stock (based on the period end market price), or cash. The Aimco Operating Partnership has a redemption policy that requires cash settlement of redemption requests for the preferred OP Units, subject to limited exceptions. Accordingly, we have excluded these securities from earnings per share and unit computations for the periods presented above, and we expect to exclude them in future periods.

Note 1411Unaudited Summarized Consolidated Quarterly InformationFair Value Measurements
AimcoRecurring Fair Value Measurements
Aimco’s summarized unauditedWe measure at fair value on a recurring basis our investment in the securitization trust that holds certain of our property debt, which we classify as AFS debt securities.
These investments are presented within other assets in the accompanying consolidated quarterly information forbalance sheets. We hold several positions in the years endedsecuritization trust that pay interest currently and we also hold the first loss position in the securitization trust, which accrues interest over the term of the investment. These investments were acquired at a discount to face value and we are accreting the discount to the $100.9 million face value of the investments through interest income using the effective interest method over the remaining expected term of the investments, which as of December 31, 20152018, was approximately 2.4 years. Our amortized cost basis for these investments, which represents the original cost adjusted for interest accretion less interest payments received, was $83.6 million and 2014, is provided below (in thousands, except per share amounts).
  Quarter
2015 First Second Third Fourth
Total revenues $244,265
 $244,783
 $246,387
 $245,875
Total operating expenses (183,198) (179,140) (182,366) (180,391)
Operating income 61,067
 65,643
 64,021
 65,484
Income from continuing operations 18,457
 23,907
 23,769
 25,257
Gain on dispositions of real estate, net of tax 85,693
 44,781
 
 50,119
Net income 104,150
 68,688
 23,769
 75,376
Net income attributable to Aimco common stockholders $89,344
 $60,804
 $19,179
 $66,639
Earnings per common share - basic:        
Income from continuing operations attributable to Aimco common stockholders $0.58
 $0.39
 $0.12
 $0.43
Net income attributable to Aimco common stockholders $0.58
 $0.39
 $0.12
 $0.43
Earnings per common share - diluted:        
Income from continuing operations attributable to Aimco common stockholders $0.58
 $0.39
 $0.12
 $0.43
Net income attributable to Aimco common stockholders $0.58
 $0.39
 $0.12
 $0.43
Weighted average common shares outstanding - basic 153,821
 155,524
 155,639
 155,725
Weighted average common shares outstanding - diluted 154,277
 155,954
 156,008
 156,043
  Quarter
2014 First Second Third Fourth
Total revenues $248,924
 $246,418
 $246,843
 $242,178
Total operating expenses (183,646) (180,621) (179,376) (178,370)
Operating income 65,278
 65,797
 67,467
 63,808
Income from continuing operations 12,040
 17,943
 18,186
 19,306
Gain on dispositions of real estate, net of tax 69,492
 66,662
 126,329
 26,153
Net income 81,532
 84,605
 144,515
 45,459
Net income attributable to Aimco common stockholders $64,235
 $75,010
 $124,706
 $36,269
Earnings per common share - basic:        
Income from continuing operations attributable to Aimco common stockholders $0.44
 $0.51
 $0.86
 $0.25
Net income attributable to Aimco common stockholders $0.44
 $0.51
 $0.86
 $0.25
Earnings per common share - diluted:        
Income from continuing operations attributable to Aimco common stockholders $0.44
 $0.51
 $0.85
 $0.25
Net income attributable to Aimco common stockholders $0.44
 $0.51
 $0.85
 $0.25
Weighted average common shares outstanding - basic 145,473
 145,657
 145,672
 145,753
Weighted average common shares outstanding - diluted 145,681
 145,985
 146,104
 146,238

F-42


The Aimco Operating Partnership
The Aimco Operating Partnership’s summarized unaudited consolidated quarterly information for the years ended$77.7 million at December 31, 20152018 and 2014,2017, respectively. We estimated the fair value of these investments to be $88.5 million and $82.8 million at December 31, 2018 and 2017, respectively.
Our investments in AFS debt securities are classified within Level 2 of the GAAP fair value hierarchy. We estimate the fair value of these investments using an income and market approach with primarily observable inputs, including yields and other information regarding similar types of investments, and adjusted for certain unobservable inputs specific to these investments. The fair value of the positions that pay interest currently typically moves in an inverse relationship with movements in interest rates. The fair value of the first loss position is provided below (in thousands, except per unit amounts).primarily correlated to collateral quality and demand for similar subordinate commercial mortgage-backed securities.
Fair Value Disclosures
  Quarter
2015 First Second Third Fourth
Total revenues $244,265
 $244,783
 $246,387
 $245,875
Total operating expenses (183,198) (179,140) (182,366) (180,391)
Operating income 61,067
 65,643
 64,021
 65,484
Income from continuing operations 18,457
 23,907
 23,769
 25,257
Gain on dispositions of real estate, net of tax 85,693
 44,781
 
 50,119
Net income 104,150
 68,688
 23,769
 75,376
Net income attributable to the Partnership’s common unitholders $93,742
 $63,776
 $20,072
 $69,930
Earnings per common unit - basic:        
Income from continuing operations attributable to the Partnership’s common unitholders $0.58
 $0.39
 $0.12
 $0.43
Net income attributable to the Partnership’s common unitholders $0.58
 $0.39
 $0.12
 $0.43
Earnings per common unit - diluted:        
Income from continuing operations attributable to the Partnership’s common unitholders $0.58
 $0.39
 $0.12
 $0.43
Net income attributable to the Partnership’s common unitholders $0.58
 $0.39
 $0.12
 $0.43
Weighted average common units outstanding - basic 161,461
 163,149
 163,241
 163,485
Weighted average common units outstanding - diluted 161,917
 163,579
 163,610
 163,803
We believe that the carrying values of the consolidated amounts of cash and cash equivalents, receivables and payables approximates their fair value at December 31, 2018 and 2017, due to their relatively short-term nature and high probability of realization. The carrying amount of seller financing notes receivable approximated their estimated fair value at December 31, 2018. The carrying amount of the total indebtedness associated with our Real Estate portfolio approximated its estimated fair value at December 31, 2018 and 2017. We estimate the fair value of our seller financing notes and our consolidated debt using an income and market approach, including comparison of the contractual terms to observable and unobservable inputs such as market interest rate risk spreads, contractual interest rates, remaining periods to maturity, collateral quality and loan to value ratios on similarly encumbered apartment communities within our portfolio. We classify the fair value of debt and seller financing notes within Level 3 of the GAAP valuation hierarchy based on the significance of certain of the unobservable inputs used to estimate its fair value.
  Quarter
2014 First Second Third Fourth
Total revenues $248,924
 $246,418
 $246,843
 $242,178
Total operating expenses (183,646) (180,621) (179,376) (178,370)
Operating income 65,278
 65,797
 67,467
 63,808
Income from continuing operations 12,040
 17,943
 18,186
 19,306
Gain on dispositions of real estate, net of tax 69,492
 66,662
 126,329
 26,153
Net income 81,532
 84,605
 144,515
 45,459
Net income attributable to the Partnership’s common unitholders $67,846
 $78,745
 $131,255
 $38,144
Earnings per common unit - basic:        
Income from continuing operations attributable to the Partnership’s common unitholders $0.44
 $0.51
 $0.86
 $0.25
Net income attributable to the Partnership’s common unitholders $0.44
 $0.51
 $0.86
 $0.25
Earnings per common unit - diluted:        
Income from continuing operations attributable to the Partnership’s common unitholders $0.44
 $0.51
 $0.85
 $0.25
Net income attributable to the Partnership’s common unitholders $0.44
 $0.51
 $0.85
 $0.25
Weighted average common units outstanding - basic 153,329
 153,377
 153,337
 153,408
Weighted average common units outstanding - diluted 153,537
 153,705
 153,769
 153,893

F-43


Note 1512 — Business Segments
We have two reportable segments: conventional real estate operations and affordable real estate operations. Our conventional real estate reportable segment included 140 apartment communities with 40,464 apartment homes at December 31, 2015. Our affordable real estate operations consisted of 56 apartment communities with 8,685 apartment homes at December 31, 2015, with rents that are generally paid, in whole or part, by a government agency.
Due to the diversity of our economic ownership interests in our apartment communities, our chief executive officer, who is our chief operating decision maker, uses proportionate property net operating income to assess the operating performance of our apartment communities. Proportionate property net operating income reflectsis defined as our share of rental and other property revenuesrevenue less directour share of property operating expenses, including real estate taxes, for the consolidated and unconsolidated apartment communities that we own and manage. Beginning in 2018, we exclude from rental and other property revenues the amount of utilities cost reimbursed by residents and reflect such amount as a reduction of the related utility expense within property operating expenses in our evaluation of segment results. In our consolidated statements of operation, utility reimbursements are included in rental and other property revenues, in accordance with GAAP. The 2017 and 2016 tables below have been revised to conform to this presentation.
Apartment communities are classified as either part of our Real Estate portfolio or, prior to the sale in July 2018, those owned through partnerships served by our Asset Management business. As of December 31, 2018, for segment performance evaluation, our Real Estate segment included 130 consolidated apartment communities with 36,407 apartment homes and excluded four apartment communities with 142 apartment homes that we neither manage nor consolidate.
Prior to the July 2018 sale of our Asset Management business, we consolidated certain partnerships in which we held nominal positions. These partnerships own low-income housing tax credit apartment communities. Neither the results of operations nor the assets of these partnerships and apartment communities were quantitatively material during our period of ownership; therefore, we have one reportable segment, Real Estate.
The following tables present the revenues, net operating income (loss) and income (loss) from continuing operationsbefore gain on dispositions of our conventional and affordable real estate operations segmentsReal Estate segment on a proportionate basis (excludingand excluding amounts related to apartment communities sold or classified as held for sale as of December 31, 2015)2018 for the years ended December 31, 2015, 20142018, 2017 and 20132016 (in thousands):
 
Conventional
Real Estate
Operations
 
Affordable
Real Estate
Operations
 
Proportionate
Adjustments (1)
 
Corporate and
Amounts Not
Allocated to
Segments (2)
 Consolidated
Year Ended December 31, 2015:         
Rental and other property revenues (3)$798,321
 $96,549
 $37,369
 $24,715
 $956,954
Tax credit and asset management revenues
 
 
 24,356
 24,356
Total revenues798,321
 96,549
 37,369
 49,071
 981,310
Property operating expenses (3)263,573
 38,484
 13,815
 43,521
 359,393
Investment management expenses
 
 
 5,855
 5,855
Depreciation and amortization (3)
 
 
 306,301
 306,301
General and administrative expenses
 
 
 43,178
 43,178
Other expenses, net
 
 
 10,368
 10,368
Total operating expenses263,573
 38,484
 13,815
 409,223
 725,095
Operating income (loss)534,748
 58,065
 23,554
 (360,152) 256,215
Other items included in continuing operations
 
 
 (164,825) (164,825)
Income (loss) from continuing operations$534,748
 $58,065
 $23,554
 $(524,977) $91,390

 
Conventional
Real Estate
Operations
 
Affordable
Real Estate
Operations
 
Proportionate
Adjustments (1)
 
Corporate and
Amounts Not
Allocated to
Segments (2)
 Consolidated
Year Ended December 31, 2014:         
Rental and other property revenues (3)$729,657
 $94,501
 $29,564
 $99,109
 $952,831
Tax credit and asset management revenues
 
 
 31,532
 31,532
Total revenues729,657
 94,501
 29,564
 130,641
 984,363
Property operating expenses (3)245,264
 38,407
 8,878
 81,105
 373,654
Investment management expenses
 
 
 7,310
 7,310
Depreciation and amortization (3)
 
 
 282,608
 282,608
Provision for real estate impairment losses (3)
 
 
 1,820
 1,820
General and administrative expenses
 
 
 44,092
 44,092
Other expenses, net
 
 
 12,529
 12,529
Total operating expenses245,264
 38,407
 8,878
 429,464
 722,013
Operating income (loss)484,393
 56,094
 20,686
 (298,823) 262,350
Other items included in continuing operations
 
 
 (194,875) (194,875)
Income (loss) from continuing operations$484,393
 $56,094
 $20,686
 $(493,698) $67,475
 Real Estate 
Proportionate and Other
Adjustments (1)
 
Corporate and
Amounts Not
Allocated to Reportable
Segment (2)
 Consolidated
Year Ended December 31, 2018:       
Rental and other property revenues attributable to Real Estate$854,240
 $34,282
 $34,071
 $922,593
Rental and other property revenues of partnerships served by Asset Management business
 
 42,830
 42,830
Tax credit and transaction revenues
 
 6,987
 6,987
Total revenues854,240
 34,282
 83,888
 972,410
Property operating expenses attributable to Real Estate238,860
 32,169
 36,872
 307,901
Property operating expenses of partnerships served by Asset Management business
 
 20,921
 20,921
Other operating expenses not allocated to reportable
segment (3)

 
 427,832
 427,832
Total operating expenses238,860
 32,169
 485,625
 756,654
Proportionate property net operating income615,380
 
 
 
Other items included in income before income tax benefit (4)
 
 487,820
 487,820
Income before income tax benefit$615,380
 $2,113
 $86,083
 $703,576

F-44


 
Conventional
Real Estate
Operations
 
Affordable
Real Estate
Operations
 
Proportionate
Adjustments (1)
 
Corporate and
Amounts Not
Allocated to
Segments (2)
 Consolidated
Year Ended December 31, 2013:         
Rental and other property revenues (3)$679,422
 $93,033
 $66,489
 $100,287
 $939,231
Tax credit and asset management revenues
 
 
 34,822
 34,822
Total revenues679,422
 93,033
 66,489
 135,109
 974,053
Property operating expenses (3)233,183
 37,433
 25,192
 79,902
 375,710
Investment management expenses
 
 
 4,341
 4,341
Depreciation and amortization (3)
 
 
 291,910
 291,910
General and administrative expenses
 
 
 45,670
 45,670
Other expenses, net
 
 
 7,403
 7,403
Total operating expenses233,183
 37,433
 25,192
 429,226
 725,034
Operating income (loss)446,239
 55,600
 41,297
 (294,117) 249,019
Other items included in continuing operations
 
 
 (214,423) (214,423)
Income (loss) from continuing operations$446,239
 $55,600
 $41,297
 $(508,540) $34,596
 Real Estate 
Proportionate and Other
Adjustments (1)
 
Corporate and
Amounts Not
Allocated to Reportable
Segment (2)
 Consolidated
Year Ended December 31, 2017:       
Rental and other property revenues attributable to Real Estate$781,194
 $43,043
 $93,911
 $918,148
Rental and other property revenues of partnerships served by Asset Management business
 
 74,046
 74,046
Tax credit and transaction revenues
 
 13,243
 13,243
Total revenues781,194
 43,043
 181,200
 1,005,437
Property operating expenses attributable to Real Estate222,731
 32,432
 63,963
 319,126
Property operating expenses of partnerships served by Asset Management business
 
 35,458
 35,458
Other operating expenses not allocated to reportable
segment (3)

 
 456,870
 456,870
Total operating expenses222,731
 32,432
 556,291
 811,454
Proportionate property net operating income558,463
 
 
 
Other items included in income before income tax benefit (4)
 
 122,260
 122,260
Income before income tax benefit$558,463
 $10,611
 $(252,831) $316,243

 Real Estate 
Proportionate and Other
Adjustments (1)
 
Corporate and
Amounts Not
Allocated to Reportable
Segment (2)
 Consolidated
Year Ended December 31, 2016:       
Rental and other property revenues attributable to Real Estate$720,302
 $55,257
 $124,332
 $899,891
Rental and other property revenues of partnerships served by Asset Management business
 
 74,640
 74,640
Tax credit and transaction revenues
 
 21,323
 21,323
Total revenues720,302
 55,257
 220,295
 995,854
Property operating expenses attributable to Real Estate210,426
 35,468
 72,063
 317,957
Property operating expenses of partnerships served by Asset Management business
 
 36,956
 36,956
Other operating expenses not allocated to reportable
segment (3)

 
 394,145
 394,145
Total operating expenses210,426
 35,468
 503,164
 749,058
Proportionate property net operating income509,876
 
 
 
Other items included in income before income tax benefit (4)
 
 217,635
 217,635
Income before income tax benefit$509,876
 $19,789
 $(65,234) $464,431
(1)Represents adjustments for the noncontrolling interests in consolidated real estate partnerships’ share of the results of our consolidated apartment communities and the results of consolidated apartment communities that we do not manage,in our Real Estate segment, which are excluded from our measurement of segment performance but included in the related consolidated amounts, andbut excluded from proportionate property net operating income for our sharesegment evaluation. Also includes the reclassification of utility reimbursements from revenues to property operating expenses for the resultspurpose of operations of our unconsolidated real estate partnerships that we manage, whichevaluating segment results. Utility reimbursements are included in rental and other property revenues in our measurementconsolidated statements of segment performance but excluded from the related consolidated amounts.operations prepared in accordance with GAAP.
(2)Our basis for assessing segment performance excludesIncludes the operating results of apartment communities sold or classified as held for sale. As discussed in Note 2, effective January 1, 2014, we adopted ASU 2014-08, which revisedduring the definition of a discontinued operation. In the segment presentation above, the current year and prior years' operating results for apartment communities soldperiods shown or classified as held for sale duringat the years ended December 31, 2015end of the period, if any, and 2014, are presented within the operating results of apartment communities owned by consolidated partnerships served by our Asset Management business prior to its sale in July 2018. Corporate and Amounts Not Allocated to Segments column. The operating results for the year ended December 31, 2013, for apartment communities sold through December 31, 2013, are presented within discontinued operations and are accordingly excluded from the segment presentation above.
(3)Proportionate property net operating income, our key measurement of segment profit or loss excludes property management revenues (which are included in rental and other property revenues),Reportable Segment also includes property management expenses and casualty gains and losses, (whichwhich are included in consolidated property operating expenses),expenses and are not part of our segment performance measure.
(3)Other operating expenses not allocated to reportable segment consists of depreciation and amortization, general and administrative expenses and other operating expenses including provision for real estate impairment losses. Accordingly, we doloss, which are not allocate these amounts toincluded in our segments.measure of segment performance.
(4)Other items included in income before income tax benefit primarily consists of gain on dispositions of real estate and interest expense.
The assets of our reportable segments on a proportionate basis, together with the proportionate adjustments to reconcile these amounts to the consolidated assets of our segments,segment and the consolidated assets not allocated to our segmentssegment are as follows (in thousands):
 December 31,
 2015 2014
Conventional$5,107,059
 $4,841,402
Affordable421,932
 439,488
Proportionate adjustments (1)175,042
 179,323
Corporate and other assets (2)440,161
 636,815
Total consolidated assets$6,144,194
 $6,097,028
 December 31,
 2018 2017
Real Estate$5,849,638
 $5,346,390
Corporate and other assets (1)340,366
 732,650
Total consolidated assets$6,190,004
 $6,079,040
(1)Represents adjustments for the noncontrolling interests in consolidated real estate partnerships’ share of
Includes the assets ofnot allocated to our consolidatedreportable segment, primarily corporate assets, and assets of apartment communities and the Asset Management business, which are excluded from our measurement of segment financial condition, and our share of the assets of our unconsolidated real estate partnerships, which are included in our measure of segment financial condition.
(2)Our basis for assessing segment performance excludes the results of apartment communitieswere sold or classified as held for sale therefore, assets related to apartment communities sold or classified as held for sale during the periods are included within Corporate and other assets for comparative periods presented.of December 31, 2018.
For the years ended December 31, 2015, 20142018, 2017 and 2013,2016, capital additions related to our conventionalReal Estate segment totaled $350.1$338.8 million, $355.4$321.9 million and $365.3$312.8 million, respectively,respectively.
Note 13 — Variable Interest Entities
Generally, a variable interest entity, or VIE, is a legal entity in which the equity investors do not have the characteristics of a controlling financial interest or the equity investors lack sufficient equity at risk for the entity to finance its activities without additional subordinated financial support. A limited partnership is considered a VIE when the majority of the limited partners unrelated to the general partner possess neither the right to remove the general partner without cause, nor certain rights to participate in the decisions that most significantly affect the financial results of the partnership. In determining whether we are the primary beneficiary of a VIE, we consider qualitative and capital additionsquantitative factors, including, but not limited to: which activities most

significantly impact the VIE’s economic performance and which party controls such activities; the amount and characteristics of our investment; the obligation or likelihood for us or other investors to provide financial support; and the similarity with and significance to our business activities and the business activities of the other investors. Significant judgments related to these determinations include estimates about the current and future fair values and performance of real estate held by these VIEs and general market conditions.
Aimco consolidates the Aimco Operating Partnership, which is a VIE for which Aimco is the primary beneficiary. Aimco, through the Aimco Operating Partnership, consolidates all VIEs for which it is the primary beneficiary.
All of the VIEs we consolidate own interests in one or more apartment communities. VIEs that own apartment communities we classify as part of our affordableReal Estate segment totaled $12.9 million, $12.1 millionare typically structured to generate a return for their partners through the operation and $10.7 million, respectively.ultimate sale of the communities. We are the primary beneficiary in the limited partnerships in which we are the sole decision maker and have a substantial economic interest.
As described in Note 3, we sold our Asset Management business in July 2018, including the nominal ownership interest we held in partnerships served by this business.

F-45

 December 31,
 2018 2017
Real Estate portfolio:   
VIEs with interests in apartment communities9
 14
Apartment communities owned by VIEs9
 14
Apartment homes in communities owned by VIEs3,592
 4,321
Consolidated partnerships served by the Asset Management business:   
VIEs with interests in apartment communities
 49
Apartment communities owned by VIEs
 37
Apartment homes in communities owned by VIEs
 5,893

Assets of the Aimco Operating Partnership’s consolidated VIEs must first be used to settle the liabilities of such consolidated VIEs. These consolidated VIEs’ creditors do not have recourse to the general credit of the Aimco Operating Partnership. Assets and liabilities of VIEs are summarized in the table below (in thousands):
 December 31,
 2018 2017
Real Estate portfolio:   
Assets   
Net real estate$488,127
 $529,898
Cash and cash equivalents15,416
 16,111
Restricted cash4,461
 4,798
Liabilities   
Non-recourse property debt322,685
 412,205
Accrued liabilities and other13,576
 10,623
Consolidated partnerships served by the Asset Management business:   
Assets   
Real estate, net
 215,580
Cash and cash equivalents
 15,931
Restricted cash
 30,107
Liabilities   
Non-recourse property debt
 220,356
Accrued liabilities and other
 20,241

Note 14 — Unaudited Summarized Consolidated Quarterly Information
Aimco
Aimco’s summarized unaudited consolidated quarterly information for the years ended December 31, 2018 and 2017, is provided below (in thousands, except per share amounts):
 Quarter
2018First Second Third Fourth
Total revenues$247,720
 $250,187
 $242,481
 $232,022
Net income95,690
 7,156
 603,917
 9,840
Net income attributable to Aimco common stockholders81,525
 2,817
 567,029
 5,226
Net income attributable to Aimco common stockholders per common
share - basic
$0.52
 $0.02
 $3.62
 $0.03
Net income attributable to Aimco common stockholders per common
share - diluted
$0.52
 $0.02
 $3.61
 $0.03
 Quarter
2017First Second Third Fourth
Total revenues$246,481
 $249,092
 $254,635
 $255,229
Net income17,155
 21,591
 22,144
 286,189
Net income attributable to Aimco common stockholders11,491
 15,843
 17,430
 262,097
Net income attributable to Aimco common stockholders per common
share - basic
$0.07
 $0.10
 $0.11
 $1.68
Net income attributable to Aimco common stockholders per common
share - diluted
$0.07
 $0.10
 $0.11
 $1.67
The Aimco Operating Partnership
The Aimco Operating Partnership’s summarized unaudited consolidated quarterly information for the years ended December 31, 2018 and 2017, is provided below (in thousands, except per unit amounts):
 Quarter
2018First Second Third Fourth
Total revenues$247,720
 $250,187
 $242,481
 $232,022
Net income95,690
 7,156
 603,917
 9,840
Net income attributable to the Partnership’s common unitholders85,274
 2,949
 597,100
 5,551
Net income attributable to the Partnership’s common unitholders per common unit - basic$0.52
 $0.02
 $3.62
 $0.03
Net income attributable to the Partnership’s common unitholders per common unit - diluted$0.52
 $0.02
 $3.61
 $0.03
 Quarter
2017First Second Third Fourth
Total revenues$246,481
 $249,092
 $254,635
 $255,229
Net income17,155
 21,591
 22,144
 286,189
Net income attributable to the Partnership’s common unitholders12,047
 16,627
 18,246
 274,380
Net income attributable to the Partnership’s common unitholders per common unit - basic$0.07
 $0.10
 $0.11
 $1.68
Net income attributable to the Partnership’s common unitholders per common unit - diluted$0.07
 $0.10
 $0.11
 $1.67

APARTMENT INVESTMENT AND MANAGEMENT COMPANY
AIMCO PROPERTIES, L.P.
SCHEDULE III: REAL ESTATE AND ACCUMULATED DEPRECIATION
December 31, 20152018
(In Thousands Except Apartment Home Data)
  (2)(3)    (2) 
 (1)   Initial Cost Cost CapitalizedDecember 31, 2015 (1)   Initial Cost Cost CapitalizedDecember 31, 2018
ApartmentDate  Year Apartment  Buildings and Subsequent to  Buildings and(4) Accumulated Total Cost ApartmentDate  Year Apartment  Buildings and Subsequent to  Buildings and(3) Accumulated Total Cost(4)
Apartment Community NameTypeConsolidatedLocation Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD)  Net of AD EncumbrancesTypeConsolidatedLocation Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD) Net of AD Encumbrances
      
Conventional Apartment Communities:   
Real Estate Segment:Real Estate Segment:   
100 Forest PlaceHigh RiseDec 1997Oak Park, IL1987234
$2,664
$18,815
$7,674
$2,664
$26,489
$29,153
$(12,726)$16,427
$
High RiseDec 1997Oak Park, IL1987234
$2,664
$18,815
$10,553
$2,664
$29,368
$32,032
$(15,640)$16,392
$35,048
118-122 West 23rd StreetHigh RiseJun 2012New York, NY198742
14,985
23,459
6,171
14,985
29,630
44,615
(4,265)40,350
18,726
High RiseJun 2012New York, NY198742
14,985
23,459
6,752
14,985
30,211
45,196
(9,121)36,075
17,457
1582 First AvenueHigh RiseMar 2005New York, NY190017
4,281
752
363
4,281
1,115
5,396
(440)4,956
2,419
173 E. 90th StreetHigh RiseMay 2004New York, NY191072
12,066
4,535
3,008
12,066
7,543
19,609
(2,749)16,860
7,120
High RiseMay 2004New York, NY191072
12,066
4,535
8,068
12,066
12,603
24,669
(3,730)20,939

182-188 Columbus AvenueMid RiseFeb 2007New York, NY191032
19,123
3,300
3,789
19,123
7,089
26,212
(2,618)23,594
13,471
Mid RiseFeb 2007New York, NY191032
19,123
3,300
5,513
19,123
8,813
27,936
(3,968)23,968
13,925
1045 on the Park Apartments HomesMid RiseJul 2013Atlanta, GA201230
2,793
6,662
692
2,793
7,354
10,147
(1,423)8,724
5,627
1582 First AvenueHigh RiseMar 2005New York, NY190017
4,281
752
499
4,281
1,251
5,532
(578)4,954
2,273
21 FitzsimonsMid-RiseAug 2014Aurora, CO2008600
12,864
104,720
1,583
12,864
106,303
119,167
(5,055)114,112
48,995
Mid RiseAug 2014Aurora, CO2008600
12,864
104,720
20,379
12,864
125,099
137,963
(19,590)118,373
90,000
234 East 88th StreetMid-RiseJan 2014New York, NY190020
2,448
4,449
482
2,448
4,931
7,379
(351)7,028
3,433
Mid RiseJan 2014New York, NY190020
2,448
4,449
807
2,448
5,256
7,704
(1,154)6,550
3,223
236-238 East 88th StreetHigh RiseJan 2004New York, NY190043
8,820
2,914
1,789
8,820
4,703
13,523
(1,605)11,918
11,587
High RiseJan 2004New York, NY190043
8,820
2,914
2,681
8,820
5,595
14,415
(1,930)12,485
10,875
237-239 Ninth AvenueHigh RiseMar 2005New York, NY190036
8,495
1,866
2,820
8,495
4,686
13,181
(1,578)11,603
5,909
High RiseMar 2005New York, NY190036
8,495
1,866
3,092
8,495
4,958
13,453
(2,770)10,683
5,553
240 West 73rd Street, LLCHigh RiseSep 2004New York, NY1900200
68,109
12,140
9,914
68,109
22,054
90,163
(7,797)82,366

High RiseSep 2004New York, NY1900200
68,109
12,140
11,905
68,109
24,045
92,154
(9,818)82,336

2900 on First ApartmentsMid RiseOct 2008Seattle, WA1989135
19,070
17,518
32,320
19,070
49,838
68,908
(11,931)56,977

Mid RiseOct 2008Seattle, WA1989135
19,070
17,518
33,542
19,070
51,060
70,130
(25,554)44,576
13,915
306 East 89th StreetHigh RiseJul 2004New York, NY193020
2,680
1,006
525
2,680
1,531
4,211
(522)3,689
1,973
High RiseJul 2004New York, NY193020
2,680
1,006
1,098
2,680
2,104
4,784
(888)3,896
1,854
311 & 313 East 73rd StreetMid RiseMar 2003New York, NY190434
5,678
1,609
503
5,678
2,112
7,790
(1,293)6,497
4,159
Mid RiseMar 2003New York, NY190434
5,678
1,609
520
5,678
2,129
7,807
(1,487)6,320
3,904
322-324 East 61st StreetHigh RiseMar 2005New York, NY190040
6,372
2,224
1,175
6,372
3,399
9,771
(1,456)8,315
3,628
High RiseMar 2005New York, NY190040
6,372
2,224
1,512
6,372
3,736
10,108
(1,830)8,278
3,410
3400 Avenue of the ArtsMid RiseMar 2002Costa Mesa, CA1987770
57,241
65,506
73,411
57,241
138,917
196,158
(77,731)118,427
108,983
Mid RiseMar 2002Costa Mesa, CA1987770
57,241
65,506
80,349
57,241
145,855
203,096
(86,923)116,173
145,752
452 East 78th StreetHigh RiseJan 2004New York, NY190012
1,982
608
397
1,982
1,005
2,987
(381)2,606
2,708
High RiseJan 2004New York, NY190012
1,982
608
548
1,982
1,156
3,138
(486)2,652
2,542
464-466 Amsterdam & 200-210 W. 83rd StreetMid RiseFeb 2007New York, NY191071
25,553
7,101
5,268
25,553
12,369
37,922
(4,936)32,986
19,679
Mid RiseFeb 2007New York, NY191071
25,553
7,101
6,070
25,553
13,171
38,724
(6,031)32,693
20,520
510 East 88th StreetHigh RiseJan 2004New York, NY190020
3,163
1,002
399
3,163
1,401
4,564
(450)4,114
2,902
High RiseJan 2004New York, NY190020
3,163
1,002
622
3,163
1,624
4,787
(642)4,145
2,724
514-516 East 88th StreetHigh RiseMar 2005New York, NY190036
6,282
2,168
842
6,282
3,010
9,292
(1,213)8,079
3,933
High RiseMar 2005New York, NY190036
6,282
2,168
1,593
6,282
3,761
10,043
(1,619)8,424
3,696
518 East 88th StreetMid-RiseJan 2014New York, NY190020
2,233
4,315
469
2,233
4,784
7,017
(365)6,652
2,974
Mid RiseJan 2014New York, NY190020
2,233
4,315
606
2,233
4,921
7,154
(1,137)6,017
2,792
707 LeahyGardenApr 2007Redwood City, CA1973110
15,444
7,909
5,527
15,444
13,436
28,880
(6,065)22,815
9,284
GardenApr 2007Redwood City, CA1973110
15,444
7,909
7,406
15,444
15,315
30,759
(6,964)23,795
8,737
777 South Broad StreetMid RiseMay 2018Philadelphia, PA2010146
6,986
67,512
829
6,986
68,341
75,327
(1,515)73,812
57,627
865 BellevueGardenJul 2000Nashville, TN1972326
3,562
12,037
28,446
3,562
40,483
44,045
(25,489)18,556
17,533
GardenJul 2000Nashville, TN1972326
3,562
12,037
23,538
3,562
35,575
39,137
(23,393)15,744

1045 on the Park Apartments HomesMid RiseJul 2013Atlanta, GA201230
2,793
6,662
139
2,793
6,801
9,594
(592)9,002
5,981
Axiom Apartment HomesMid RiseApr 2015Cambridge, MA2015115

63,612
165

63,777
63,777
(1,580)62,197
35,000
Avery RowMid RiseDec 2018Arlington, VA201367
8,140
21,348

8,140
21,348
29,488

29,488

AxiomMid RiseApr 2015Cambridge, MA2015115

63,612
2,444

66,056
66,056
(8,920)57,136
32,978
Bank LoftsHigh RiseApr 2001Denver, CO1920125
3,525
9,045
3,632
3,525
12,677
16,202
(6,053)10,149
11,181
High RiseApr 2001Denver, CO1920125
3,525
9,045
5,539
3,525
14,584
18,109
(7,463)10,646
10,476
Bay Parc PlazaHigh RiseSep 2004Miami, FL2000471
22,680
41,847
9,486
22,680
51,333
74,013
(14,939)59,074
44,194
High RiseSep 2004Miami, FL2000474
22,680
41,847
34,053
22,680
75,900
98,580
(22,485)76,095
42,434
Bay Ridge at NashuaGardenJan 2003Nashua, NH1984412
3,262
40,713
5,300
3,262
46,013
49,275
(18,304)30,971
29,820
GardenJan 2003Nashua, NH1984412
3,262
40,713
16,739
3,262
57,452
60,714
(22,738)37,976
51,450
Bayberry Hill EstatesGardenAug 2002Framingham, MA1971424
19,944
35,945
12,765
19,944
48,710
68,654
(22,056)46,598
32,051
GardenAug 2002Framingham, MA1971424
19,944
35,945
21,847
19,944
57,792
77,736
(27,629)50,107

Bent Tree ApartmentsGardenFeb 2018Centreville, VA1986748
46,975
113,695
7,493
46,975
121,188
168,163
(4,331)163,832

Bluffs at Pacifica, TheGardenOct 2006Pacifica, CA196364
8,108
4,132
14,672
8,108
18,804
26,912
(9,922)16,990
5,694
GardenOct 2006Pacifica, CA196364
8,108
4,132
17,804
8,108
21,936
30,044
(10,996)19,048

Boston LoftsHigh RiseApr 2001Denver, CO1890158
3,446
20,589
5,634
3,446
26,223
29,669
(12,820)16,849
16,333
High RiseApr 2001Denver, CO1890158
3,446
20,589
5,694
3,446
26,283
29,729
(13,914)15,815
15,303
Boulder CreekGardenJul 1994Boulder, CO1973221
754
7,730
20,205
754
27,935
28,689
(16,502)12,187
6,708
GardenJul 1994Boulder, CO1973221
754
7,730
20,628
754
28,358
29,112
(19,702)9,410
38,500
Broadcast CenterGardenMar 2002Los Angeles, CA1990279
29,407
41,244
27,070
29,407
68,314
97,721
(34,668)63,053

GardenMar 2002Los Angeles, CA1990279
29,407
41,244
28,683
29,407
69,927
99,334
(29,655)69,679

Broadway LoftsHigh RiseSep 2012San Diego, CA190984
5,367
14,442
1,297
5,367
15,739
21,106
(1,862)19,244
9,448
High RiseSep 2012San Diego, CA190984
5,367
14,442
6,126
5,367
20,568
25,935
(4,604)21,331
11,531
Burke Shire CommonsGardenMar 2001Burke, VA1986360
4,867
23,617
13,699
4,867
37,316
42,183
(17,380)24,803
40,536
GardenMar 2001Burke, VA1986360
4,867
23,617
17,678
4,867
41,295
46,162
(24,737)21,425
57,860
Calhoun Beach ClubHigh RiseDec 1998Minneapolis, MN1928332
11,708
73,334
54,533
11,708
127,867
139,575
(67,386)72,189
45,050
Canyon TerraceGardenMar 2002Saugus, CA1984130
7,508
6,601
6,024
7,508
12,625
20,133
(7,170)12,963
9,708
Cedar RimGardenApr 2000Newcastle, WA1980104
761
5,218
16,939
761
22,157
22,918
(18,439)4,479
7,246
Charlesbank Apartment HomesMid RiseSep 2013Watertown, MA201244
3,399
11,726
281
3,399
12,007
15,406
(966)14,440
8,214
Chestnut HallHigh RiseOct 2006Philadelphia, PA1923315
12,338
14,299
10,196
12,338
24,495
36,833
(13,517)23,316
38,940
Chestnut Hill VillageGardenApr 2000Philadelphia, PA1963821
6,469
49,316
43,542
6,469
92,858
99,327
(57,694)41,633
54,374
Chimneys of Cradle RockGardenJun 2004Columbia, MD1979198
2,040
8,108
536
2,040
8,644
10,684
(2,889)7,795
15,619

F-46


  (2)(3)    (2) 
 (1)   Initial Cost Cost CapitalizedDecember 31, 2015 (1)   Initial Cost Cost CapitalizedDecember 31, 2018
ApartmentDate  Year Apartment  Buildings and Subsequent to  Buildings and(4) Accumulated Total Cost ApartmentDate  Year Apartment ��Buildings and Subsequent to  Buildings and(3) Accumulated Total Cost(4)
Apartment Community NameTypeConsolidatedLocation Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD)  Net of AD EncumbrancesTypeConsolidatedLocation Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD) Net of AD Encumbrances
      
Calhoun Beach ClubHigh RiseDec 1998Minneapolis, MN1928332
11,708
73,334
64,948
11,708
138,282
149,990
(79,547)70,443

Canyon TerraceGardenMar 2002Saugus, CA1984130
7,508
6,601
6,525
7,508
13,126
20,634
(6,960)13,674

Cedar RimGardenApr 2000Newcastle, WA1980104
761
5,218
13,032
761
18,250
19,011
(13,153)5,858

Charlesbank Apartment HomesMid RiseSep 2013Watertown, MA201244
3,399
11,726
821
3,399
12,547
15,946
(2,404)13,542
7,718
Chestnut HallHigh RiseOct 2006Philadelphia, PA1923315
12,338
14,299
12,074
12,338
26,373
38,711
(12,144)26,567
36,653
Chimneys of Cradle RockGardenJun 2004Columbia, MD1979198
2,040
8,108
1,116
2,040
9,224
11,264
(4,206)7,058

Columbus AvenueMid RiseSep 2003New York, NY188059
35,527
9,450
5,137
35,527
14,587
50,114
(8,251)41,863
26,853
Mid RiseSep 2003New York, NY188059
35,527
9,450
9,117
35,527
18,567
54,094
(10,600)43,494
25,205
CreeksideGardenJan 2000Denver, CO1974328
3,189
12,698
5,882
3,189
18,580
21,769
(11,630)10,139
12,021
GardenJan 2000Denver, CO1974328
3,189
12,698
7,450
3,189
20,148
23,337
(13,072)10,265
11,325
Crescent at West Hollywood, TheMid RiseMar 2002West Hollywood, CA1985130
15,765
10,215
14,535
15,765
24,750
40,515
(17,836)22,679

Mid RiseMar 2002West Hollywood, CA1985130
15,765
10,215
8,411
15,765
18,626
34,391
(12,166)22,225
40,000
EastpointeGardenDec 2014Boulder, CO1970140
15,300
2,705
53
15,300
2,758
18,058
(98)17,960

Elm CreekMid RiseDec 1997Elmhurst, IL1987400
5,910
30,830
29,904
5,910
60,734
66,644
(26,752)39,892
39,940
Mid RiseDec 1997Elmhurst, IL1987400
5,910
30,830
31,950
5,910
62,780
68,690
(32,993)35,697
51,341
Evanston PlaceHigh RiseDec 1997Evanston, IL1990190
3,232
25,546
11,823
3,232
37,369
40,601
(16,285)24,316
20,005
High RiseDec 1997Evanston, IL1990190
3,232
25,546
16,214
3,232
41,760
44,992
(19,152)25,840

FarmingdaleMid RiseOct 2000Darien, IL1975240
11,763
15,174
9,766
11,763
24,940
36,703
(11,975)24,728
14,979
Mid RiseOct 2000Darien, IL1975240
11,763
15,174
11,173
11,763
26,347
38,110
(13,618)24,492
13,106
Flamingo TowersHigh RiseSep 1997Miami Beach, FL19601,227
32,430
48,808
267,185
32,434
315,989
348,423
(137,704)210,719
109,398
High RiseSep 1997Miami Beach, FL19601,324
32,427
48,808
339,187
32,427
387,995
420,422
(174,249)246,173
103,152
Four Quarters HabitatGardenJan 2006Miami, FL1976336
2,379
17,199
20,843
2,379
38,042
40,421
(21,879)18,542
6,781
GardenJan 2006Miami, FL1976336
2,379
17,199
30,286
2,379
47,485
49,864
(27,112)22,752
51,603
FoxchaseGardenDec 1997Alexandria, VA19402,113
15,496
96,062
38,356
15,496
134,418
149,914
(73,312)76,602
237,881
GardenDec 1997Alexandria, VA19402,113
15,496
96,062
52,254
15,496
148,316
163,812
(85,298)78,514
223,626
GeorgetownGardenAug 2002Framingham, MA1964207
12,351
13,168
2,700
12,351
15,868
28,219
(6,769)21,450
7,863
GardenAug 2002Framingham, MA1964207
12,351
13,168
3,996
12,351
17,164
29,515
(8,281)21,234
14,697
Georgetown IIMid RiseAug 2002Framingham, MA195872
4,577
4,057
1,252
4,577
5,309
9,886
(2,595)7,291
2,634
Mid RiseAug 2002Framingham, MA195872
4,577
4,057
2,118
4,577
6,175
10,752
(3,483)7,269

Grand PointeGardenDec 1999Columbia, MD1972325
2,714
16,771
5,977
2,714
22,748
25,462
(11,931)13,531

Heritage Park EscondidoGardenOct 2000Escondido, CA1986196
1,055
7,565
1,659
1,055
9,224
10,279
(6,112)4,167
6,831
GardenOct 2000Escondido, CA1986196
1,055
7,565
2,572
1,055
10,137
11,192
(6,993)4,199
6,129
Heritage Park LivermoreGardenOct 2000Livermore, CA1988167

10,209
1,625

11,834
11,834
(7,036)4,798
7,060
GardenOct 2000Livermore, CA1988167

10,209
1,850

12,059
12,059
(8,176)3,883
6,353
Heritage Village AnaheimGardenOct 2000Anaheim, CA1986196
1,832
8,541
1,455
1,832
9,996
11,828
(6,295)5,533
8,291
GardenOct 2000Anaheim, CA1986196
1,832
8,541
2,084
1,832
10,625
12,457
(6,999)5,458
7,441
Hidden CoveGardenJul 1998Escondido, CA1983334
3,043
17,616
10,350
3,043
27,966
31,009
(14,817)16,192
35,320
GardenJul 1998Escondido, CA1983334
3,043
17,616
10,802
3,043
28,418
31,461
(16,205)15,256
51,840
Hidden Cove IIGardenJul 2007Escondido, CA1986118
12,849
6,530
7,063
12,849
13,593
26,442
(7,274)19,168
14,310
GardenJul 2007Escondido, CA1986118
12,849
6,530
5,260
12,849
11,790
24,639
(5,263)19,376
20,160
HillcresteGardenMar 2002Century City, CA1989315
35,862
47,216
18,465
35,862
65,681
101,543
(31,011)70,532
67,724
GardenMar 2002Century City, CA1989315
35,862
47,216
13,194
35,862
60,410
96,272
(27,374)68,898
63,479
HillmeadeGardenNov 1994Nashville, TN1986288
2,872
16,070
12,287
2,872
28,357
31,229
(16,545)14,684
16,307
GardenNov 1994Nashville, TN1986288
2,872
16,070
20,200
2,872
36,270
39,142
(21,006)18,136
27,321
Horizons West ApartmentsMid RiseDec 2006Pacifica, CA197078
8,887
6,377
2,373
8,887
8,750
17,637
(3,752)13,885

Mid RiseDec 2006Pacifica, CA197078
8,887
6,377
1,634
8,887
8,011
16,898
(3,689)13,209

Hunt ClubGardenSep 2000Gaithersburg, MD1986336
17,859
13,149
9,320
17,859
22,469
40,328
(11,993)28,335

GardenSep 2000Gaithersburg, MD1986336
17,859
13,149
14,154
17,859
27,303
45,162
(16,083)29,079

Hunter's ChaseGardenJan 2001Midlothian, VA1985320
7,935
7,915
3,156
7,935
11,071
19,006
(5,032)13,974
14,704
Hunters GlenGardenOct 1999Plainsboro, NJ1976896
8,778
47,259
39,501
8,778
86,760
95,538
(63,424)32,114
62,228
Hyde Park TowerHigh RiseOct 2004Chicago, IL1990155
4,731
14,927
5,076
4,731
20,003
24,734
(5,429)19,305
13,499
High RiseOct 2004Chicago, IL1990155
4,731
14,927
12,334
4,731
27,261
31,992
(9,569)22,423
12,620
Indian OaksGardenMar 2002Simi Valley, CA1986254
24,523
15,801
5,323
24,523
21,124
45,647
(10,467)35,180

GardenMar 2002Simi Valley, CA1986254
24,523
15,801
11,246
24,523
27,047
51,570
(13,180)38,390
27,596
IndigoHigh RiseAug 2016Redwood City, CA2016463
26,932
296,116
1,771
26,932
297,887
324,819
(24,707)300,112
138,430
Island ClubGardenOct 2000Oceanside, CA1986592
18,027
28,654
16,400
18,027
45,054
63,081
(27,267)35,814
58,917
GardenOct 2000Oceanside, CA1986592
18,027
28,654
18,740
18,027
47,394
65,421
(30,320)35,101
94,967
Key TowersHigh RiseApr 2001Alexandria, VA1964140
1,526
7,050
6,794
1,526
13,844
15,370
(9,988)5,382
9,939
High RiseApr 2001Alexandria, VA1964140
1,526
7,050
7,781
1,526
14,831
16,357
(11,892)4,465

LakesideGardenOct 1999Lisle, IL1972568
5,840
27,937
32,367
5,840
60,304
66,144
(40,623)25,521
26,830
GardenOct 1999Lisle, IL1972568
5,840
27,937
22,408
5,840
50,345
56,185
(33,582)22,603
25,090
Lakeside at Vinings MountainGardenJan 2000Atlanta, GA1983220
2,111
11,862
15,536
2,111
27,398
29,509
(19,806)9,703
13,985
LatrobeHigh RiseJan 2003Washington, DC1980175
3,459
9,103
16,471
3,459
25,574
29,033
(17,915)11,118
28,460
High RiseJan 2003Washington, DC1980175
3,459
9,103
12,715
3,459
21,818
25,277
(11,916)13,361
26,758
Laurel CrossingGardenJan 2006San Mateo, CA1971418
49,474
17,756
14,166
49,474
31,922
81,396
(15,757)65,639

Lincoln Place (5)GardenOct 2004Venice, CA1951795
128,332
10,439
331,935
44,197
342,374
386,571
(41,609)344,962
197,449
GardenOct 2004Venice, CA1951795
128,332
10,439
337,267
44,197
347,706
391,903
(121,677)270,226
187,723
Locust on the ParkHigh RiseMay 2018Philadelphia, PA1911152
5,292
53,823
2,474
5,292
56,297
61,589
(1,183)60,406
35,728
Lodge at Chattahoochee, TheGardenOct 1999Sandy Springs, GA1970312
2,335
16,370
20,826
2,335
37,196
39,531
(24,539)14,992
20,530
GardenOct 1999Sandy Springs, GA1970312
2,335
16,370
16,809
2,335
33,179
35,514
(22,375)13,139

Malibu CanyonGardenMar 2002Calabasas, CA1986698
69,834
53,438
21,973
69,834
75,411
145,245
(36,536)108,709
111,854
GardenMar 2002Calabasas, CA1986698
69,834
53,438
37,919
69,834
91,357
161,191
(45,222)115,969
105,367
Maple BayGardenDec 1999Virginia Beach, VA1971414
2,597
16,141
28,071
2,597
44,212
46,809
(30,732)16,077

Mariner'sGardenMar 2002San Diego, CA1984500

66,861
7,956

74,817
74,817
(32,476)42,341

Mariners CoveGardenMar 2002San Diego, CA1984500

66,861
13,317

80,178
80,178
(39,035)41,143

Meadow CreekGardenJul 1994Boulder, CO1968332
1,435
24,533
4,863
1,435
29,396
30,831
(15,893)14,938

GardenJul 1994Boulder, CO1968332
1,435
24,533
9,602
1,435
34,135
35,570
(19,285)16,285

Merrill HouseHigh RiseJan 2000Falls Church, VA1964159
1,836
10,831
7,558
1,836
18,389
20,225
(9,281)10,944
17,911
High RiseJan 2000Falls Church, VA1964159
1,836
10,831
7,657
1,836
18,488
20,324
(10,492)9,832

MezzoHigh RiseMar 2015Atlanta, GA200894
4,292
34,178
9
4,292
34,187
38,479
(1,153)37,326
24,962
High RiseMar 2015Atlanta, GA200894
4,292
34,178
1,250
4,292
35,428
39,720
(5,484)34,236
23,496
Monterey GroveGardenJun 2008San Jose, CA1999224
34,325
21,939
4,178
34,325
26,117
60,442
(9,158)51,284

GardenJun 2008San Jose, CA1999224
34,325
21,939
8,674
34,325
30,613
64,938
(12,039)52,899

Ocean House on ProspectMid RiseApr 2013La Jolla, CA197053
12,528
18,805
14,615
12,528
33,420
45,948
(684)45,264
13,906
Mid RiseApr 2013La Jolla, CA197053
12,528
18,805
15,089
12,528
33,894
46,422
(6,592)39,830
12,745
One CanalHigh RiseSep 2013Boston, MAIn process310

15,873
146,811

162,684
162,684
(1)162,683
86,151
High RiseSep 2013Boston, MA2016310

15,873
179,912

195,785
195,785
(20,623)175,162
110,310
Pacific Bay Vistas (5)GardenMar 2001San Bruno, CA1987308
28,694
62,460
36,590
23,354
99,050
122,404
(14,841)107,563
70,356
GardenMar 2001San Bruno, CA1987308
28,694
62,460
39,067
23,354
101,527
124,881
(35,131)89,750
67,826
Pacifica ParkGardenJul 2006Pacifica, CA1977104
12,970
6,579
4,465
12,970
11,044
24,014
(5,001)19,013
11,687
GardenJul 2006Pacifica, CA1977104
12,970
6,579
7,879
12,970
14,458
27,428
(6,565)20,863
28,613
Palazzo at Park La Brea, TheMid RiseFeb 2004Los Angeles, CA2002521
48,362
125,464
30,633
48,362
156,097
204,459
(65,684)138,775
170,000
Palazzo East at Park La Brea, TheMid RiseMar 2005Los Angeles, CA2005611
72,578
136,503
18,586
72,578
155,089
227,667
(61,475)166,192
117,447
Park Towne PlaceHigh RiseApr 2000Philadelphia, PA1959948
10,472
47,301
213,782
10,472
261,083
271,555
(59,556)211,999

ParkwayGardenMar 2000Willamsburg, VA1971148
386
2,834
2,757
386
5,591
5,977
(3,450)2,527


F-47


  (2)(3)    (2) 
 (1)   Initial Cost Cost CapitalizedDecember 31, 2015 (1)   Initial Cost Cost CapitalizedDecember 31, 2018
ApartmentDate  Year Apartment  Buildings and Subsequent to  Buildings and(4) Accumulated Total Cost ApartmentDate  Year Apartment  Buildings and Subsequent to  Buildings and(3) Accumulated Total Cost(4)
Apartment Community NameTypeConsolidatedLocation Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD)  Net of AD EncumbrancesTypeConsolidatedLocation Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD) Net of AD Encumbrances
      
Palazzo at Park La Brea, TheMid RiseFeb 2004Los Angeles, CA2002521
48,362
125,464
45,176
48,362
170,640
219,002
(80,075)138,927
168,654
Palazzo East at Park La Brea, TheMid RiseMar 2005Los Angeles, CA2005611
72,578
136,503
19,328
72,578
155,831
228,409
(72,709)155,700
196,109
Parc MosaicGardenDec 2014Boulder, CO1970226
15,300

53,638
15,300
53,638
68,938

68,938

Park Towne PlaceHigh RiseApr 2000Philadelphia, PA1959940
10,472
47,301
345,748
10,472
393,049
403,521
(119,350)284,171
200,000
Pathfinder VillageGardenJan 2006Fremont, CA1973246
19,595
14,838
10,266
19,595
25,104
44,699
(11,145)33,554
39,604
GardenJan 2006Fremont, CA1973246
19,595
14,838
18,457
19,595
33,295
52,890
(14,518)38,372
55,000
Peachtree ParkGardenJan 1996Atlanta, GA1969303
4,684
11,713
12,506
4,684
24,219
28,903
(13,562)15,341
7,301
GardenJan 1996Atlanta, GA1969303
4,684
11,713
14,045
4,684
25,758
30,442
(16,449)13,993
27,800
Peak at Vinings Mountain, TheGardenJan 2000Atlanta, GA1980280
2,651
13,660
18,395
2,651
32,055
34,706
(23,516)11,190
14,776
Plantation GardensGardenOct 1999Plantation ,FL1971372
3,773
19,443
19,344
3,773
38,787
42,560
(21,336)21,224
21,737
GardenOct 1999Plantation, FL1971372
3,773
19,443
25,655
3,773
45,098
48,871
(27,273)21,598

Post RidgeGardenJul 2000Nashville, TN1972150
1,883
6,712
4,557
1,883
11,269
13,152
(7,181)5,971
5,465
GardenJul 2000Nashville, TN1972150
1,883
6,712
4,537
1,883
11,249
13,132
(7,401)5,731

Preserve at MarinMid RiseAug 2011Corte Madera, CA1964126
18,179
30,132
81,024
18,179
111,156
129,335
(7,458)121,877
38,478
Mid RiseAug 2011Corte Madera, CA1964126
18,179
30,132
84,629
18,179
114,761
132,940
(26,039)106,901
36,260
Ravensworth TowersHigh RiseJun 2004Annandale, VA1974219
3,455
17,157
3,055
3,455
20,212
23,667
(12,328)11,339
21,613
High RiseJun 2004Annandale, VA1974219
3,455
17,157
4,490
3,455
21,647
25,102
(14,617)10,485
20,342
ReflectionsGardenSep 2000Virginia Beach, VA1987480
15,988
13,684
4,840
15,988
18,524
34,512
(9,758)24,754
29,352
River Club,TheGardenApr 2005Edgewater, NJ1998266
30,579
30,638
3,783
30,579
34,421
65,000
(12,764)52,236

GardenApr 2005Edgewater, NJ1998266
30,579
30,638
7,475
30,579
38,113
68,692
(17,293)51,399
60,000
RiverloftHigh RiseOct 1999Philadelphia, PA1910184
2,120
11,286
29,301
2,120
40,587
42,707
(18,171)24,536
12,495
High RiseOct 1999Philadelphia, PA1910184
2,120
11,286
35,086
2,120
46,372
48,492
(23,386)25,106
7,680
RiversideHigh RiseApr 2000Alexandria ,VA19731,222
10,854
65,473
91,415
10,854
156,888
167,742
(110,957)56,785
114,639
RosewoodGardenMar 2002Camarillo, CA1976152
12,430
8,060
3,600
12,430
11,660
24,090
(5,475)18,615
16,697
GardenMar 2002Camarillo, CA1976152
12,430
8,060
5,754
12,430
13,814
26,244
(6,984)19,260

Royal Crest EstatesGardenAug 2002Warwick, RI1972492
22,433
24,095
4,365
22,433
28,460
50,893
(17,152)33,741
34,670
GardenAug 2002Warwick, RI1972492
22,433
24,095
5,512
22,433
29,607
52,040
(20,050)31,990

Royal Crest EstatesGardenAug 2002Nashua, NH1970902
68,230
45,562
11,025
68,230
56,587
124,817
(36,300)88,517
32,759
GardenAug 2002Nashua, NH1970902
68,230
45,562
15,751
68,230
61,313
129,543
(41,440)88,103
71,957
Royal Crest EstatesGardenAug 2002Marlborough, MA1970473
25,178
28,786
8,731
25,178
37,517
62,695
(20,443)42,252
32,188
GardenAug 2002Marlborough, MA1970473
25,178
28,786
13,490
25,178
42,276
67,454
(26,610)40,844

Royal Crest EstatesGardenAug 2002North Andover, MA1970588
51,292
36,808
21,462
51,292
58,270
109,562
(27,517)82,045

GardenAug 2002North Andover, MA1970588
51,292
36,808
27,916
51,292
64,724
116,016
(36,132)79,884

Savannah TraceGardenMar 2001Shaumburg, IL1986368
13,960
20,731
5,185
13,960
25,916
39,876
(13,367)26,509
24,142
Saybrook PointGardenDec 2014San Jose, CA1995324
32,842
84,457
625
32,842
85,082
117,924
(2,957)114,967
64,861
GardenDec 2014San Jose, CA1995324
32,842
84,457
25,729
32,842
110,186
143,028
(14,179)128,849
62,329
ScotchollowGardenJan 2006San Mateo, CA1971418
49,475
17,756
12,635
49,475
30,391
79,866
(14,101)65,765
75,749
Shenandoah CrossingGardenSep 2000Fairfax, VA1984640
18,200
57,198
19,746
18,200
76,944
95,144
(43,570)51,574
61,964
GardenSep 2000Fairfax, VA1984640
18,200
57,198
25,345
18,200
82,543
100,743
(58,302)42,441
58,565
SouthStar LoftsHigh RiseMay 2018Philadelphia, PA201485
1,780
37,428
402
1,780
37,830
39,610
(836)38,774
30,197
Springwoods at Lake RidgeGardenJul 2002Woodbridge, VA1984180
5,587
7,284
2,857
5,587
10,141
15,728
(3,214)12,514

GardenJul 2002Woodbridge, VA1984180
5,587
7,284
3,642
5,587
10,926
16,513
(4,606)11,907

SteeplechaseGardenSep 2000Largo, MD1986240
3,675
16,111
4,464
3,675
20,575
24,250
(11,298)12,952

St. George VillasGardenJan 2006St. George, SC198440
107
1,025
410
107
1,435
1,542
(1,256)286
314
Sterling Apartment Homes, TheGardenOct 1999Philadelphia, PA1961535
8,871
55,365
75,489
8,871
130,854
139,725
(49,401)90,324
69,983
GardenOct 1999Philadelphia, PA1961534
8,871
55,365
120,426
8,871
175,791
184,662
(82,367)102,295
144,030
Stone Creek ClubGardenSep 2000Germantown, MD1984240
13,593
9,347
6,895
13,593
16,242
29,835
(10,321)19,514

GardenSep 2000Germantown, MD1984240
13,593
9,347
8,078
13,593
17,425
31,018
(12,553)18,465

The Left BankMid RiseMay 2018Philadelphia, PA1929282

130,893
3,053

133,946
133,946
(2,879)131,067
82,532
Timbers at Long Reach Apartment HomesGardenApr 2005Columbia, MD1979178
2,430
12,181
496
2,430
12,677
15,107
(6,704)8,403
12,896
GardenApr 2005Columbia, MD1979178
2,430
12,181
1,705
2,430
13,886
16,316
(8,182)8,134

Towers Of Westchester Park, TheHigh RiseJan 2006College Park, MD1972303
15,198
22,029
11,982
15,198
34,011
49,209
(13,952)35,257
24,952
High RiseJan 2006College Park, MD1972303
15,198
22,029
13,936
15,198
35,965
51,163
(18,825)32,338
23,232
Township At HighlandsTown HomeNov 1996Centennial, CO1985161
1,536
9,773
6,618
1,536
16,391
17,927
(10,131)7,796
14,738
Town HomeNov 1996Centennial, CO1985161
1,536
9,773
9,280
1,536
19,053
20,589
(12,181)8,408
13,557
TremontMid RiseDec 2014Atlanta, GA200978
5,274
18,550
530
5,274
19,080
24,354
(663)23,691

Mid RiseDec 2014Atlanta, GA200978
5,274
18,011
2,746
5,274
20,757
26,031
(3,110)22,921

Twin Lake TowersHigh RiseOct 1999Westmont, IL1969399
3,268
18,763
37,876
3,268
56,639
59,907
(41,472)18,435
31,110
High RiseOct 1999Westmont, IL1969399
3,268
18,763
37,904
3,268
56,667
59,935
(43,106)16,829
44,906
Vantage PointeMid RiseAug 2002Swampscott, MA198796
4,748
10,089
1,652
4,748
11,741
16,489
(4,312)12,177
4,561
Mid RiseAug 2002Swampscott, MA198796
4,748
10,089
2,314
4,748
12,403
17,151
(5,294)11,857
2,746
Views at Vinings Mountain, TheGardenJan 2006Atlanta, GA1983180
610
5,026
12,011
610
17,037
17,647
(15,466)2,181

Villa Del SolGardenMar 2002Norwalk, CA1972120
7,476
4,861
2,284
7,476
7,145
14,621
(4,044)10,577
11,237
GardenMar 2002Norwalk, CA1972120
7,476
4,861
4,553
7,476
9,414
16,890
(5,216)11,674
10,582
Village of PennbrookGardenOct 1998Levittown, PA1969722
10,240
38,222
11,293
10,240
49,515
59,755
(29,580)30,175
44,021
Villas at Park La Brea, TheGardenMar 2002Los Angeles, CA2002250
8,630
48,871
6,950
8,630
55,821
64,451
(25,367)39,084
19,248
GardenMar 2002Los Angeles, CA2002250
8,630
48,871
16,008
8,630
64,879
73,509
(30,510)42,999
53,868
Villas of PasadenaMid RiseJan 2006Pasadena, CA197392
9,693
6,818
1,978
9,693
8,796
18,489
(3,329)15,160
9,689
Mid RiseJan 2006Pasadena, CA197392
9,693
6,818
4,493
9,693
11,311
21,004
(4,397)16,607

VivoHigh RiseJun 2015Cambridge, MA201591
6,450
35,974
1,332
6,450
37,306
43,756
(480)43,276

High RiseJun 2016Cambridge, MA201591
6,450
35,974
5,590
6,450
41,564
48,014
(8,694)39,320
20,310
Waterford VillageGardenAug 2002Bridgewater, MA1971588
29,110
28,101
3,161
29,110
31,262
60,372
(22,639)37,733
37,394
GardenAug 2002Bridgewater, MA1971588
29,110
28,101
8,222
29,110
36,323
65,433
(26,540)38,893
35,269
Waterways VillageGardenJun 1997Aventura, FL1994180
4,504
11,064
6,180
4,504
17,244
21,748
(9,092)12,656

GardenJun 1997Aventura, FL1994180
4,504
11,064
15,205
4,504
26,269
30,773
(12,394)18,379
13,168
Waverly ApartmentsGardenAug 2008Brighton, MA1970103
7,920
11,347
2,289
7,920
13,636
21,556
(4,422)17,134
12,241
GardenAug 2008Brighton, MA1970103
7,920
11,347
6,299
7,920
17,646
25,566
(6,323)19,243
11,515
Wexford VillageGardenAug 2002Worcester, MA1974264
6,349
17,939
1,725
6,349
19,664
26,013
(10,694)15,319
9,290
GardenAug 2002Worcester, MA1974264
6,349
17,939
4,245
6,349
22,184
28,533
(12,980)15,553

Willow BendGardenMay 1998Rolling Meadows, IL1969328
2,717
15,437
26,474
2,717
41,911
44,628
(29,319)15,309
18,037
GardenMay 1998Rolling Meadows, IL1969328
2,717
15,437
19,609
2,717
35,046
37,763
(23,492)14,271
33,175
WindriftGardenMar 2001Oceanside, CA1987404
24,960
17,590
19,074
24,960
36,664
61,624
(25,511)36,113
41,084
GardenMar 2001Oceanside, CA1987404
24,960
17,590
21,487
24,960
39,077
64,037
(23,762)40,275

Windsor ParkGardenMar 2001Woodbridge, VA1987220
4,279
15,970
5,503
4,279
21,473
25,752
(10,732)15,020
17,992
GardenMar 2001Woodbridge, VA1987220
4,279
15,970
6,217
4,279
22,187
26,466
(13,378)13,088

Woods Of WilliamsburgGardenJan 2006Williamsburg, VA1976125
798
3,657
1,103
798
4,760
5,558
(3,930)1,628

Yacht Club at BrickellHigh RiseDec 2003Miami, FL1998357
31,362
32,214
9,809
31,362
42,023
73,385
(13,309)60,076
47,304
High RiseDec 2003Miami, FL1998357
31,362
32,214
16,715
31,362
48,929
80,291
(17,513)62,778
44,219
Yorktown ApartmentsHigh RiseDec 1999Lombard, IL1971364
3,055
18,162
33,837
3,055
51,999
55,054
(23,181)31,873
30,328
High RiseDec 1999Lombard, IL1971364
3,055
18,162
52,436
3,055
70,598
73,653
(29,697)43,956
38,280
Total Conventional Apartment Communities 40,226
1,834,423
3,104,080
2,606,954
1,744,952
5,711,030
7,455,982
(2,371,248)5,084,734
3,515,121
Other (6) 
5,135

20,914
5,135
20,914
26,049

26,049

Total Real Estate SegmentTotal Real Estate Segment 35,625
1,846,000
3,494,014
3,058,051
1,756,525
6,552,065
8,308,590
(2,585,115)5,723,475
3,937,000
  
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 

F-48


      (2)(3)      
  (1)    Initial Cost Cost CapitalizedDecember 31, 2015
 ApartmentDate  Year Apartment  Buildings and Subsequent to  Buildings and(4) Accumulated Total Cost 
Apartment Community NameTypeConsolidatedLocation Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD)  Net of AD Encumbrances
               
Affordable Apartment Communities:             
All HallowsGardenJan 2006San Francisco, CA1976157
1,338
29,770
21,196
1,338
50,966
52,304
(29,359)22,945
22,334
Arvada HouseHigh RiseNov 2004Arvada, CO197788
405
3,314
2,289
405
5,603
6,008
(2,602)3,406
3,909
BayviewGardenJun 2005San Francisco, CA1976146
582
15,265
17,888
582
33,153
33,735
(20,987)12,748
11,604
Beacon HillHigh RiseMar 2002Hillsdale, MI1980198
1,094
7,044
6,171
1,094
13,215
14,309
(6,359)7,950
6,774
Biltmore TowersHigh RiseMar 2002Dayton, OH1980230
1,814
6,411
13,114
1,814
19,525
21,339
(12,498)8,841
10,257
Butternut CreekMid RiseJan 2006Charlotte, MI1980100
505
3,617
3,975
505
7,592
8,097
(5,851)2,246
4,047
Carriage HouseMid RiseDec 2006Petersburg, VA1885118
716
2,886
4,233
716
7,119
7,835
(3,923)3,912
1,833
City LineGardenMar 2002Newport News, VA1976200
500
2,014
7,712
500
9,726
10,226
(4,582)5,644
4,324
Copperwood I ApartmentsGardenApr 2006The Woodlands, TX1980150
383
8,373
5,901
383
8,117
8,500
(6,142)2,358
5,156
Copperwood II ApartmentsGardenOct 2005The Woodlands, TX1981150
459
5,553
3,647
459
9,200
9,659
(5,442)4,217
5,320
Country Club HeightsGardenMar 2004Quincy, IL1976200
676
5,715
5,113
676
10,828
11,504
(6,097)5,407
5,472
Crevenna OaksTown HomeJan 2006Burke, VA197950

5,203
437

5,640
5,640
(3,181)2,459
2,492
Fountain PlaceMid RiseJan 2006Connersville, IN1980102
378
2,091
3,205
378
5,296
5,674
(2,046)3,628
918
Hopkins VillageMid RiseSep 2003Baltimore, MD1979165
549
5,973
3,821
549
9,794
10,343
(4,406)5,937
9,100
Ingram SquareGardenJan 2006San Antonio, TX1980120
800
3,136
5,899
800
9,035
9,835
(5,559)4,276
3,251
Kirkwood HouseHigh RiseSep 2004Baltimore, MD1979261
1,337
9,358
9,053
1,337
18,411
19,748
(8,568)11,180
16,000
La SalleGardenOct 2000San Francisco, CA1976145
1,866
19,567
17,969
1,866
37,536
39,402
(25,603)13,799
17,522
La VistaGardenJan 2006Concord, CA198175
581
4,449
4,668
581
9,117
9,698
(3,772)5,926
4,950
Loring TowersHigh RiseOct 2002Minneapolis, MN1975230
886
7,445
8,220
886
15,665
16,551
(7,613)8,938
9,578
Loring Towers ApartmentsHigh RiseSep 2003Salem, MA1973250
187
14,050
7,940
187
21,990
22,177
(10,106)12,071
9,978
New BaltimoreMid RiseMar 2002New Baltimore, MI1980101
896
2,360
5,311
896
7,671
8,567
(4,208)4,359
1,982
NorthpointGardenJan 2000Chicago, IL1921304
2,510
14,334
15,511
2,510
29,845
32,355
(21,599)10,756
17,580
Panorama ParkGardenMar 2002Bakersfield, CA198266
521
5,520
1,210
521
6,730
7,251
(3,547)3,704
1,790
Park PlaceMid RiseJun 2005St Louis, MO1977242
705
6,327
8,260
705
14,587
15,292
(10,771)4,521
8,524
Parkways, TheGardenJun 2004Chicago, IL1925446
3,426
23,257
20,768
3,426
44,025
47,451
(25,348)22,103
16,953
PavilionHigh RiseMar 2004Philadelphia, PA1976296

15,415
2,308

17,723
17,723
(9,034)8,689
6,585
Pleasant HillsGardenApr 2005Austin, TX1982100
1,229
2,631
3,859
1,229
6,490
7,719
(3,763)3,956
2,951
Plummer VillageMid RiseMar 2002North Hills, CA198375
666
2,647
1,313
666
3,960
4,626
(2,634)1,992
2,336
RiverwoodsHigh RiseJan 2006Kankakee, IL1983125
598
4,931
3,628
598
8,559
9,157
(3,642)5,515
3,493
Round Barn ManorGardenMar 2002Champaign, IL1979156
810
5,134
6,130
810
11,264
12,074
(4,111)7,963
4,210
San Jose ApartmentsGardenSep 2005San Antonio, TX1970220
234
5,770
12,398
234
18,168
18,402
(9,917)8,485
4,358
San Juan Del CentroMid RiseSep 2005Boulder, CO1971150
439
7,110
13,147
439
20,257
20,696
(10,729)9,967
11,707
ShoreviewGardenOct 1999San Francisco, CA1976156
1,476
19,071
19,803
1,476
38,874
40,350
(27,030)13,320
18,957
South Bay VillaGardenMar 2002Los Angeles, CA198180
1,352
2,770
3,556
1,352
6,326
7,678
(5,205)2,473
2,752
St. George VillasGardenJan 2006St. George, SC198440
107
1,025
382
107
1,407
1,514
(1,140)374
378
Stonegate AptsMid RiseJul 2009Indianapolis, IN192052
122
1,920
764
122
2,684
2,806
(1,478)1,328
1,799
Summit OaksTown HomeJan 2006Burke, VA198050

5,311
444

5,755
5,755
(3,070)2,685
2,478
Tamarac Pines Apartments IGardenNov 2004Woodlands, TX1980144
363
2,775
3,366
363
6,141
6,504
(3,396)3,108
3,692
Tamarac Pines Apartments IIGardenNov 2004Woodlands, TX1980156
266
3,195
4,020
266
7,215
7,481
(3,918)3,563
4,000
Terry ManorMid RiseOct 2005Los Angeles, CA1977170
1,997
5,848
5,265
1,997
11,113
13,110
(8,419)4,691
6,254
Tompkins TerraceGardenOct 2002Beacon, NY1974193
872
6,827
14,306
872
21,133
22,005
(10,200)11,805
6,613
University SquareHigh RiseMar 2005Philadelphia, PA1978442
702
12,201
13,014
702
25,215
25,917
(8,788)17,129

Van Nuys ApartmentsHigh RiseMar 2002Los Angeles, CA1981299
3,576
21,226
23,543
3,576
44,769
48,345
(18,832)29,513
24,151
Wah Luck HouseHigh RiseJan 2006Washington, DC1982153

7,772
661

8,433
8,433
(2,922)5,511
5,457
Walnut HillsHigh RiseJan 2006Cincinnati, OH1983198
826
5,608
5,635
820
11,249
12,069
(5,613)6,456
5,117
Washington Square WestMid RiseSep 2004Philadelphia, PA1982132
582
11,169
5,273
582
16,442
17,024
(11,093)5,931
3,474
Whitefield PlaceGardenApr 2005San Antonio, TX198080
219
3,151
2,128
219
5,279
5,498
(2,989)2,509
2,028

F-49


       (2)      
  (1)    Initial Cost Cost CapitalizedDecember 31, 2018
 ApartmentDate  Year Apartment  Buildings and Subsequent to  Buildings and(3) Accumulated Total Cost(4)
Apartment Community NameTypeConsolidatedLocation Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD) Net of AD Encumbrances
               
               
(1) Date we acquired the apartment community or first consolidated the partnership that owns the apartment community.
(2) Includes costs capitalized since acquisition or date of initial consolidation of the partnership/apartment community.
(3) The aggregate cost of land and depreciable property for federal income tax purposes was approximately $4.0 billion at December 31, 2018.
(4) Encumbrances are presented before reduction for debt issuance costs.
(5) The current carrying value of the apartment community reflects an impairment loss recognized during prior periods.
(6) Other includes land parcels and certain non-residential properties held for future development.
     



















     



















      (2)(3)      
  (1)    Initial Cost Cost CapitalizedDecember 31, 2015
 ApartmentDate  Year Apartment  Buildings and Subsequent to  Buildings and(4) Accumulated Total Cost 
Apartment Community NameTypeConsolidatedLocation Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD)  Net of AD Encumbrances
               
Winter GardensHigh RiseMar 2004St Louis, MO1920112
300
3,072
4,706
300
7,778
8,078
(2,654)5,424
3,336
Woodland HillsGardenOct 2005Jackson, MI1980125
320
3,875
3,950
327
7,818
8,145
(4,662)3,483
3,265
Total Affordable Apartment Communities   7,998
40,170
373,486
357,110
40,171
724,438
764,609
(405,408)359,201
331,039
Other (6)    
76,034
10,474
384
76,034
10,858
86,892
(1,366)85,526

Total    48,224
$1,950,627
$3,488,040
$2,964,448
$1,861,157
$6,446,326
$8,307,483
$(2,778,022)$5,529,461
$3,846,160
               
(1) Date we acquired the apartment community or first consolidated the partnership which owns the apartment community.
(2) For 2008 and prior periods, costs to acquire the noncontrolling interest’s share of our consolidated real estate partnerships were capitalized as part of the initial cost.
(3) Costs capitalized subsequent to consolidation includes costs capitalized since acquisition or first consolidation of the partnership/apartment community.
(4) The aggregate cost of land and depreciable property for Federal income tax purposes was approximately $3.8 billion at December 31, 2015.
(5) The current carrying value of the apartment community reflects an impairment loss recognized during prior periods.
(6) Other includes land parcels and certain non-residential properties held for future development.
      
 
 
 
 
 
 
 
 
 
      
 
 
 
 
 
 
 
 
 


F-50


APARTMENT INVESTMENT AND MANAGEMENT COMPANY
AIMCO PROPERTIES, L.P.
SCHEDULE III: REAL ESTATE AND ACCUMULATED DEPRECIATION
For the Years Ended December 31, 2015, 20142018, 2017 and 20132016
(In Thousands)

2015 2014 20132018 2017 2016
Real Estate
Balance at beginning of year
$8,144,958
 $8,214,081
 $8,333,419
Real Estate Segment     
Real Estate balance at beginning of year$7,927,753
 $7,931,117
 $7,744,894
Additions during the year:          
Acquisitions147,077
 379,187
 66,058
501,009
 16,687
 333,174
Capital additions362,948
 367,454
 376,038
344,501
 345,974
 329,697
Deductions during the year:     
Casualty and other write-offs (1)(79,561) (111,068) (98,489)(58,152) (106,590) (170,744)
Impairment of real estate
 (35,881) 
Amounts related to assets held for sale(7,036) (38,744) 
(83,905) (38,208) 
Sales(260,903) (665,952) (462,945)(322,616) (185,346) (305,904)
Balance at end of year$8,307,483
 $8,144,958
 $8,214,081
Accumulated Depreciation
Balance at beginning of year
$2,672,179
 $2,822,872
 $2,820,765
Real Estate balance at end of year$8,308,590
 $7,927,753
 $7,931,117
     
Accumulated Depreciation balance at beginning of year$2,522,358
 $2,421,357
 $2,488,448
Additions during the year:          
Depreciation285,514
 265,060
 288,666
339,883
 320,870
 287,661
Deductions during the year:          
Casualty and other write-offs (1)(78,838) (106,802) (92,775)(57,067) (106,521) (169,098)
Amounts related to assets held for sale(4,427) (12,304) 
(41,717) (20,383) 
Sales(96,406) (296,647) (193,784)(178,342) (92,965) (185,654)
Balance at end of year$2,778,022
 $2,672,179
 $2,822,872
Accumulated depreciation balance at end of year$2,585,115
 $2,522,358
 $2,421,357
     
Asset Management Business     
Real Estate balance at beginning of year$551,124
 $555,049
 $562,589
Additions during the year:     
Capital additions4,226
 8,255
 8,909
Deductions during the year:     
Casualty and other write-offs (2)6,603
 (1,711) (2,116)
Amounts related to assets held for sale
 
 (2,801)
Sales(561,953) (10,469) (11,532)
Real Estate balance at end of year$
 $551,124
 $555,049
     
Accumulated Depreciation balance at beginning of year$326,251
 $309,401
 $289,574
Additions during the year:     
Depreciation14,325
 24,090
 24,704
Deductions during the year:     
Casualty and other write-offs (2)6,704
 (2,480) (68)
Amounts related to assets held for sale
 
 (1,525)
Sales(347,280) (4,760) (3,284)
Accumulated depreciation balance at end of year$
 $326,251
 $309,401
(1)
Includes the write-off of fully depreciated assets totaling $76.9$54.5 million, $106.3$106.4 million and $91.9$167.9 million, during the years ended December 31, 2015,2018, 20142017 and 2013,2016, respectively.
(2)
Includes the write-off of fully depreciated assets totaling $6.7 million and $1.8 million, during the years ended December 31, 2018 and 2017, respectively.


F-51F-45