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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-Q
ý☒QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the Quarterly Period Ended September 30, 20172021
or
¨☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from             to             
Commission File Number: 1-13087 (Boston Properties, Inc.)
Commission File Number: 0-50209 (Boston Properties Limited Partnership)
BOSTON PROPERTIES, INC.
BOSTON PROPERTIES LIMITED PARTNERSHIP
(Exact name of Registrants as specified in its charter)
Boston Properties, Inc.Delaware04-2473675
(State or other jurisdiction of incorporation or organization)(I.R.S. Employer Identification Number)
Boston Properties Limited PartnershipDelaware04-3372948
(State or other jurisdiction of incorporation or organization)(I.R.S. Employer Identification Number)
Prudential Center, 800 Boylston Street, Suite 1900, Boston, Massachusetts 02199-8103
(Address of principal executive offices) (Zip Code)
(617) 236-3300
(Registrants’ telephone number, including area code)
Securities registered pursuant to Section 12(b) of the Act:
RegistrantTitle of each classTrading Symbol(s)Name of each exchange on which registered
Boston Properties, Inc.Common Stock, par value $0.01 per shareBXPNew York Stock Exchange
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.  
Boston Properties, Inc.:    Yes  x   No  ¨ ☐         Boston Properties Limited Partnership:    Yes  x    No  ¨☐

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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 (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    
Boston Properties, Inc.:    Yes  x    No  ¨ ☐         Boston Properties Limited Partnership:    Yes  x    No  ¨


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☐
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See definitionthe definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.
Boston Properties, Inc.:    
Large accelerated filer  x         Accelerated filer  ¨☐         Non-accelerated filer  ¨
☐Smaller reporting company  ¨ ☐         Emerging growth company¨☐

Boston Properties Limited Partnership:
Large accelerated filer  ¨☐         Accelerated filer  ¨☐         Non-accelerated filer  x
Smaller reporting company  ¨☐           Emerging growth company¨

☐
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.
Boston Properties, Inc. ¨ ☐                 Boston Properties Limited Partnership ¨☐
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    
Boston Properties, Inc.:    Yes  ¨☐    No  x        Boston Properties Limited Partnership:    Yes  ¨☐    No  x
Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.
Boston Properties, Inc.Common Stock, par value $0.01 per share154,322,266156,206,944
(Registrant)(Class)(Outstanding on November 2, 2017)2021)


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EXPLANATORY NOTE
This report combines the quarterly reportsQuarterly Reports on Form 10-Q for the period ended September 30, 20172021 of Boston Properties, Inc. and Boston Properties Limited Partnership. Unless stated otherwise or the context otherwise requires, references to “BXP” mean Boston Properties, Inc., a Delaware corporation and real estate investment trust (“REIT”), and references to “BPLP” and the “Operating Partnership” mean Boston Properties Limited Partnership, a Delaware limited partnership. Unless stated otherwise or the context requires, references to the “Company,” “we,” “us” and “our” mean collectively BXP, BPLP and those entities/subsidiaries consolidated by BXP.
BPLP is the entity through which BXP conducts substantially all of its business and owns, either directly or through subsidiaries, substantially all of its assets. BXP is the sole general partner and also a limited partner of BPLP. As the sole general partner of BPLP, BXP has exclusive control of BPLP’s day-to-day management. Therefore, unless stated otherwise or the context requires, references to the “Company,” “we,” “us” and “our” mean collectively BXP, BPLP and those entities/subsidiaries consolidated by BXP.
As of September 30, 2017,2021, BXP owned an approximate 89.7%89.9% ownership interest in BPLP. The remaining approximate 10.3%10.1% interest iswas owned by limited partners. The other limited partners of BPLP are (1) persons who contributed their direct or indirect interests in properties to BPLP in exchange for common units or preferred units of limited partnership interest in BPLP and/or (2) recipients of long termlong-term incentive plan units of BPLP pursuant to BXP’s Stock Option and Incentive Plans. Under the limited partnership agreement of BPLP, unitholders may present their common units of BPLP for redemption at any time (subject to restrictions agreed upon at the time of issuance of the units that may restrict such right for a period of time, generally one year from issuance). Upon presentation of a common unit for redemption, BPLP must redeem the unit for cash equal to the then value of a share of BXP’s common stock. In lieu of a cash redemption by BPLP, however, BXP may elect to acquire any common units so tendered by issuing shares of BXP common stock in exchange for the common units. If BXP so elects, its common stock will be exchanged for common units on a one-for-one basis. This one-for-one exchange ratio is subject to specified adjustments to prevent dilution. BXP generally expects that it will elect to issue its common stock in connection with each such presentation for redemption rather than having BPLP pay cash. With each such exchange or redemption, BXP’s percentage ownership in BPLP will increase. In addition, whenever BXP issues shares of its common stock other than to acquire common units of BPLP, BXP must contribute any net proceeds it receives to BPLP and BPLP must issue to BXP an equivalent number of common units of BPLP. This structure is commonly referred to as an umbrella partnership REIT, or UPREIT.
The Company believes that combining the quarterly reportsQuarterly Reports on Form 10-Q of BXP and BPLP into this single report provides the following benefits:report:
•enhances investors’ understanding of BXP and BPLP by enabling investorsthem to view the business as a whole in the same manner as management views and operates the business;
•eliminates duplicative disclosure and provides a more concise and readable presentation because a substantial portion of the disclosure applies to both BXP and BPLP; and
•creates time and cost efficiencies through the preparation of one combined report instead of two separate reports.
The Company believes it is important to understand the few differences between BXP and BPLP in the context of how BXP and BPLP operate as a consolidated company. The financial results of BPLP are consolidated into the financial statements of BXP. BXP does not have any other significant assets, liabilities or operations, other than its investment in BPLP, nor does it have employees of its own. BPLP, not BXP, generally executes all significant business relationships other than transactions involving the securities of BXP. BPLP holds substantially all of the assets of BXP, including ownership interests in joint ventures. BPLP conducts the operations of the business and is structured as a partnership with no publicly traded equity. Except for the net proceeds from equity offerings by BXP, which are contributed to the capital of BPLP in exchange for common or preferred units of partnership in BPLP, as applicable, BPLP generates all remaining capital required by the Company’s business. These sources include working capital, net cash provided by operating activities, borrowings under its credit facilities, the issuance of secured and unsecured debt and equity securities and proceeds received from the disposition of certain properties and interests in joint ventures.
Shareholders’ equity,Equity, partners’ capital and noncontrolling interests are the main areas of difference between the consolidated financial statements of BXP and BPLP. The limited partners of BPLP are accounted for as partners’ capital in BPLP’s financial statements and as noncontrolling interests in BXP’s financial statements. The noncontrolling interests in BPLP’s financial statements include the interests of unaffiliated partners in various consolidated partnerships. The noncontrolling interests in BXP’s financial statements include the same noncontrolling interests at BPLP’s levelin

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BPLP and limited partners of BPLP. The differences between shareholders’ equity and partners’ capital result from differences in the equity issued at BXP and BPLP levels.

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In addition, the consolidated financial statements of BXP and BPLP differ in total real estate assets resulting from previously applied acquisition accounting by BXP for the issuance of common stock in connection with non-sponsor redemptions of common units of BPLP. This accounting resulted in a step-up of the real estate assets of BXP at BXP.the time of such redemptions. This resulted in a difference between the net real estate of BXP as compared to BPLP of approximately $320.8$264.7 million, or 2.0%1.5% at September 30, 20172021, and a corresponding difference in depreciation expense, impairment losses and gains on sales of real estate upon the sale of certain properties having an allocation of the real estate step-up. The acquisition accounting was nullified on a prospective basis beginning in 2009 as a result of the Company’s adoption of a new accounting standard requiring any future redemptions to be accounted for solely as an equity transaction.
To help investors better understand the key differences between BXP and BPLP, certain information for BXP and BPLP in this report has been separated, as set forth below:
• Item 1. Financial Statements (unaudited), which includes the following specific disclosures for BXP and BPLP:
•Note 3. Real Estate;
•Note 6. Derivative Instruments and Hedging Activities;
•Note 8. Noncontrolling Interests;
•Note 9.11. Stockholders’ Equity / Partners’ Capital;
•Note 10.12. Segment Information; and
• Note 13. Earnings Per Share / Common Unit; andUnit
•Note 12: Segment Information
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations includes information specific to each entity, where applicable; and
• Item 2. Liquidity and Capital Resources includes separate reconciliations of amounts to each entity’s financial statements, where applicable.
This report also includes separate Part I - Item 4. Controls and Procedures and Part II - Item 2. Unregistered Sales of Equity Securities and Use of Proceeds sections for each of BXP and BPLP, as well as separate Exhibits 12, 31 and 32 calculation of ratios of earnings to fixed charges and certifications for each of BXP and BPLP.





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BOSTON PROPERTIES, INC. AND BOSTON PROPERTIES LIMITED PARTNERSHIP
FORM 10-Q
for the quarter ended September 30, 20172021
TABLE OF CONTENTS
Page
ITEM 1.
1
Boston Properties, Inc.
21
b) Consolidated Statements of Operations for the three and nine months ended SeptemberSeptember 30 2017, 2021 and 20162020
3
c) Consolidated Statements of Comprehensive Income for the three and nine months ended September 30, 20172021 and 20162020
4
d) Consolidated Statements of Stockholders’ Equity for the three and nine months ended September 30 2017, 2021 and 20162020
5
e) Consolidated Statements of Cash Flows for the nine months ended September 30 2017, 2021 and 20162020
67
Boston Properties Limited Partnership
89
b) Consolidated Statements of Operations for the three and nine months ended September 30 2017, 2021 and 20162020
911
c) Consolidated Statements of Comprehensive Income for the three and nine months ended September 30 2017, 2021 and 20162020
1012
d) Consolidated Statements of Partners’ Capital and Noncontrolling Interests for the three and nine months ended September 30 2017, 2021 and 20162020
1113
e) Consolidated Statements of Cash Flows for the nine months ended September 30 2017, 2021 and 20162020
1215
Boston Properties, Inc. and Boston Properties Limited Partnership
1417


ITEM 2.
4147
ITEM 3.
8797
ITEM 4.
8798
ITEM 1.
8999
ITEM 1A.
8999
ITEM 2.
89100
ITEM 3.
89101
ITEM 4.
89101
ITEM 5.
89101
ITEM 6.
90102
91103



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PART I. FINANCIAL INFORMATION
ITEM 1—Financial Statements.





BOSTON PROPERTIES, INC.
CONSOLIDATED BALANCE SHEETS
(unaudited and in thousands, except for share and par value amounts)
September 30,
2021		December 31,
2020
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,688,647 and $6,592,019 at September 30, 2021 and December 31, 2020, respectively)$23,711,400 $22,969,110 
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at September 30, 2021 and December 31, 2020, respectively)237,845 237,393 
Right of use assets - operating leases170,085 146,406 
Less: accumulated depreciation (amounts related to VIEs of $(1,266,516) and $(1,158,548) at September 30, 2021 and December 31, 2020, respectively)(5,850,397)(5,534,102)
Total real estate18,268,933 17,818,807 
Cash and cash equivalents (amounts related to VIEs of $288,186 and $340,642 at September 30, 2021 and December 31, 2020, respectively)1,002,728 1,668,742 
Cash held in escrows79,193 50,587 
Investments in securities41,517 39,457 
Tenant and other receivables, net (amounts related to VIEs of $8,598 and $10,911 at September 30, 2021 and December 31, 2020, respectively)61,269 77,411 
Related party note receivable, net78,144 77,552 
Notes receivable, net19,297 18,729 
Accrued rental income, net (amounts related to VIEs of $352,291 and $336,594 at September 30, 2021 and December 31, 2020, respectively)1,203,840 1,122,502 
Deferred charges, net (amounts related to VIEs of $174,172 and $183,306 at September 30, 2021 and December 31, 2020, respectively)622,807 640,085 
Prepaid expenses and other assets (amounts related to VIEs of $42,051 and $13,137 at September 30, 2021 and December 31, 2020, respectively)97,560 33,840 
Investments in unconsolidated joint ventures1,373,522 1,310,478 
Total assets$22,848,810 $22,858,190 
LIABILITIES AND EQUITY
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $2,898,699 and $2,907,590 at September 30, 2021 and December 31, 2020, respectively)$2,898,699 $2,909,081 
Unsecured senior notes, net10,479,651 9,639,287 
Unsecured line of credit— — 
Unsecured term loan, net— 499,390 
Lease liabilities - finance leases (amounts related to VIEs of $20,420 and $20,306 at September 30, 2021 and December 31, 2020, respectively)243,562 236,492 
Lease liabilities - operating leases204,137 201,713 
Accounts payable and accrued expenses (amounts related to VIEs of $36,967 and $23,128 at September 30, 2021 and December 31, 2020, respectively)331,687 336,264 
Dividends and distributions payable169,739 171,082 
Accrued interest payable87,408 106,288 
Other liabilities (amounts related to VIEs of $124,615 and $158,805 at September 30, 2021 and December 31, 2020, respectively)370,403 412,084 
Total liabilities14,785,286 14,511,681 
Commitments and contingencies (See Note 9)
Redeemable deferred stock units— 80,989 and 72,966 units outstanding at redemption value at September 30, 2021 and December 31, 2020, respectively8,775 6,897 
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BOSTON PROPERTIES, INC.
CONSOLIDATED BALANCE SHEETS
(unaudited and in thousands, except for share and par value amounts)
September 30,
2021		December 31,
2020
Equity:
Stockholders’ equity attributable to Boston Properties, Inc.:
Excess stock, $0.01 par value, 150,000,000 shares authorized, none issued or outstanding— — 
Preferred stock, $0.01 par value, 50,000,000 shares authorized;
5.25% Series B cumulative redeemable preferred stock, $0.01 par value, liquidation preference $2,500 per share, 92,000 shares authorized, 80,000 shares issued and outstanding at December 31, 2020— 200,000 
Common stock, $0.01 par value, 250,000,000 shares authorized, 156,285,391 and 155,797,725 issued and 156,206,491 and 155,718,825 outstanding at September 30, 2021 and December 31, 2020, respectively1,562 1,557 
Additional paid-in capital6,415,802 6,356,791 
Dividends in excess of earnings(657,021)(509,653)
Treasury common stock at cost, 78,900 shares at September 30, 2021 and December 31, 2020(2,722)(2,722)
Accumulated other comprehensive loss(40,803)(49,890)
Total stockholders’ equity attributable to Boston Properties, Inc.5,716,818 5,996,083 
Noncontrolling interests:
Common units of Boston Properties Limited Partnership609,830 616,596 
Property partnerships1,728,101 1,726,933 
Total equity8,054,749 8,339,612 
Total liabilities and equity$22,848,810 $22,858,190 
BOSTON PROPERTIES, INC.
CONSOLIDATED BALANCE SHEETS
(Unaudited)
 September 30, 2017 December 31, 2016
 (in thousands, except for share and par value amounts)
ASSETS   
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $7,084,588 and $6,760,078 at September 30, 2017 and December 31, 2016, respectively)$20,859,245
 $20,147,263
Less: accumulated depreciation (amounts related to VIEs of $(825,390) and $(758,640) at September 30, 2017 and December 31, 2016, respectively)(4,484,798) (4,222,235)
Total real estate16,374,447
 15,925,028
Cash and cash equivalents (amounts related to VIEs of $285,089 and $253,999 at September 30, 2017 and December 31, 2016, respectively)493,055
 356,914
Cash held in escrows (amounts related to VIEs of $6,179 and $4,955 at September 30, 2017 and December 31, 2016, respectively)83,779
 63,174
Investments in securities27,981
 23,814
Tenant and other receivables (amounts related to VIEs of $19,891 and $23,525 at September 30, 2017 and December 31, 2016, respectively)79,750
 92,548
Accrued rental income (amounts related to VIEs of $232,336 and $224,185 at September 30, 2017 and December 31, 2016, respectively)835,415
 799,138
Deferred charges, net (amounts related to VIEs of $268,727 and $290,436 at September 30, 2017 and December 31, 2016, respectively)657,474
 686,163
Prepaid expenses and other assets (amounts related to VIEs of $68,330 and $42,718 at September 30, 2017 and December 31, 2016, respectively)144,817
 129,666
Investments in unconsolidated joint ventures611,800
 775,198
Total assets$19,308,518
 $18,851,643
LIABILITIES AND EQUITY   
Liabilities:   
Mortgage notes payable, net (amounts related to VIEs of $2,941,550 and $2,018,483 at September 30, 2017 and December 31, 2016, respectively)$2,982,067
 $2,063,087
Unsecured senior notes, net7,252,567
 7,245,953
Unsecured line of credit—
 —
Unsecured term loan—
 —
Mezzanine notes payable (amounts related to VIEs of $0 and $307,093 at September 30, 2017 and December 31, 2016, respectively)—
 307,093
Outside members’ notes payable (amounts related to VIEs of $0 and $180,000 at September 30, 2017 and December 31, 2016, respectively)—
 180,000
Accounts payable and accrued expenses (amounts related to VIEs of $106,772 and $110,457 at September 30, 2017 and December 31, 2016, respectively)325,440
 298,524
Dividends and distributions payable130,434
 130,308
Accrued interest payable (amounts related to VIEs of $6,800 and $162,226 at September 30, 2017 and December 31, 2016, respectively)99,100
 243,933
Other liabilities (amounts related to VIEs of $146,517 and $175,146 at September 30, 2017 and December 31, 2016, respectively)419,215
 450,821
Total liabilities11,208,823
 10,919,719
Commitments and contingencies—
 —
Equity:   
Stockholders’ equity attributable to Boston Properties, Inc.:   
Excess stock, $0.01 par value, 150,000,000 shares authorized, none issued or outstanding—
 —
Preferred stock, $0.01 par value, 50,000,000 shares authorized;   
5.25% Series B cumulative redeemable preferred stock, $0.01 par value, liquidation preference $2,500 per share, 92,000 shares authorized, 80,000 shares issued and outstanding at September 30, 2017 and December 31, 2016200,000
 200,000
Common stock, $0.01 par value, 250,000,000 shares authorized, 154,401,166 and 153,869,075 issued and 154,322,266 and 153,790,175 outstanding at September 30, 2017 and December 31, 2016, respectively1,543
 1,538
Additional paid-in capital6,370,932
 6,333,424
Dividends in excess of earnings(692,739) (693,694)
Treasury common stock at cost, 78,900 shares at September 30, 2017 and December 31, 2016(2,722) (2,722)
Accumulated other comprehensive loss(51,796) (52,251)
Total stockholders’ equity attributable to Boston Properties, Inc.5,825,218
 5,786,295
Noncontrolling interests:   
Common units of Boston Properties Limited Partnership605,802
 614,982
Property partnerships1,668,675
 1,530,647
Total equity8,099,695
 7,931,924
Total liabilities and equity$19,308,518
 $18,851,643
















The accompanying notes are an integral part of these consolidated financial statements.

2

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BOSTON PROPERTIES, INC.
CONSOLIDATED STATEMENTS OF OPERATIONS
(Unaudited)(unaudited and in thousands, except for per share amounts)
Three months ended September 30,Nine months ended September 30,
 2021202020212020
Revenue
Lease$692,260 $666,674 $2,062,102 $2,006,904 
Parking and other23,507 16,327 58,727 54,777 
Hotel5,189 90 7,382 7,014 
Development and management services6,094 7,281 20,181 23,285 
Direct reimbursements of payroll and related costs from management services contracts3,006 2,896 9,166 8,617 
Total revenue730,056 693,268 2,157,558 2,100,597 
Expenses
Operating
Rental258,281 258,261 764,373 761,014 
Hotel3,946 3,164 7,993 11,958 
General and administrative34,560 27,862 117,924 102,059 
Payroll and related costs from management services contracts3,006 2,896 9,166 8,617 
Transaction costs1,888 307 2,970 1,254 
Depreciation and amortization179,412 166,456 539,815 515,738 
Total expenses481,093 458,946 1,442,241 1,400,640 
Other income (expense)
Loss from unconsolidated joint ventures(5,597)(6,873)(1,745)(5,410)
Gains (losses) on sales of real estate348 (209)8,104 613,723 
Interest and other income (loss)1,520 (45)4,140 4,277 
Gains (losses) from investments in securities(190)1,858 3,744 965 
Losses from early extinguishment of debt— — (898)— 
Interest expense(105,794)(110,993)(320,015)(319,726)
Net income139,250 118,060 408,647 993,786 
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnerships(18,971)(15,561)(52,602)(34,280)
Noncontrolling interest—common units of the Operating Partnership(11,982)(10,020)(35,393)(97,090)
Net income attributable to Boston Properties, Inc.108,297 92,479 320,652 862,416 
Preferred dividends— (2,625)(2,560)(7,875)
Preferred stock redemption charge— — (6,412)— 
Net income attributable to Boston Properties, Inc. common shareholders$108,297 $89,854 $311,680 $854,541 
Basic earnings per common share attributable to Boston Properties, Inc. common shareholders:
Net income$0.69 $0.58 $2.00 $5.49 
Weighted average number of common shares outstanding156,183 155,645 156,062 155,349 
Diluted earnings per common share attributable to Boston Properties, Inc. common shareholders:
Net income$0.69 $0.58 $1.99 $5.49 
Weighted average number of common and common equivalent shares outstanding156,598 155,670 156,394 155,447 
 Three months ended September 30, Nine months ended September 30,
 2017 2016 2017 2016
 (in thousands, except for per share amounts)
Revenue       
Rental       
Base rent$513,269
 $489,312
 $1,537,373
 $1,518,826
Recoveries from tenants94,476
 92,560
 272,803
 267,852
Parking and other26,092
 24,638
 78,164
 75,576
Total rental revenue633,837
 606,510
 1,888,340
 1,862,254
Hotel revenue13,064
 12,354
 33,859
 33,919
Development and management services10,811
 6,364
 24,648
 18,586
Total revenue657,712
 625,228
 1,946,847
 1,914,759
Expenses       
Operating       
Rental237,341
 228,560
 696,082
 665,670
Hotel8,447
 8,118
 23,942
 23,730
General and administrative25,792
 25,165
 84,319
 79,936
Transaction costs239
 249
 572
 1,187
Impairment loss—
 1,783
 —
 1,783
Depreciation and amortization152,164
 203,748
 463,288
 516,371
Total expenses423,983
 467,623
 1,268,203
 1,288,677
Operating income233,729
 157,605
 678,644
 626,082
Other income (expense)       
Income from unconsolidated joint ventures843
 1,464
 7,035
 5,489
Interest and other income1,329
 3,628
 3,447
 6,657
Gains from investments in securities944
 976
 2,716
 1,713
Gains (losses) from early extinguishments of debt—
 (371) 14,354
 (371)
Losses from interest rate contracts—
 (140) —
 (140)
Interest expense(92,032) (104,641) (282,709) (314,953)
Income before gains on sales of real estate144,813
 58,521
 423,487
 324,477
Gains on sales of real estate2,891
 12,983
 6,791
 80,606
Net income147,704
 71,504
 430,278
 405,083
Net income attributable to noncontrolling interests       
Noncontrolling interests in property partnerships(14,340) 17,225
 (33,967) (53)
Noncontrolling interest—common units of Boston Properties Limited Partnership(13,402) (9,387) (40,350) (42,120)
Net income attributable to Boston Properties, Inc.119,962
 79,342
 355,961
 362,910
Preferred dividends(2,625) (2,589) (7,875) (7,796)
Net income attributable to Boston Properties, Inc. common shareholders$117,337
 $76,753
 $348,086
 $355,114
Basic earnings per common share attributable to Boston Properties, Inc. common shareholders:       
Net income$0.76
 $0.50
 $2.26
 $2.31
Weighted average number of common shares outstanding154,355
 153,754
 154,132
 153,681
Diluted earnings per common share attributable to Boston Properties, Inc. common shareholders:       
Net income$0.76
 $0.50
 $2.26
 $2.31
Weighted average number of common and common equivalent shares outstanding154,483
 154,136
 154,344
 153,971
        
Dividends per common share$0.75
 $0.65
 $2.25
 $1.95


The accompanying notes are an integral part of these consolidated financial statements.

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BOSTON PROPERTIES, INC.
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
(Unaudited)(unaudited and in thousands)
 
Three months ended September 30, Nine months ended September 30,
2017 2016 2017 2016Three months ended September 30,Nine months ended September 30,
(in thousands) 2021202020212020
Net income$147,704
 $71,504
 $430,278
 $405,083
Net income$139,250 $118,060 $408,647 $993,786 
Other comprehensive income (loss):       Other comprehensive income (loss):
Effective portion of interest rate contracts—
 5,712
 (6,133) (85,285)Effective portion of interest rate contracts1,088 1,027 5,482 (9,352)
Amortization of interest rate contracts (1)1,665
 1,190
 4,368
 2,445
Amortization of interest rate contracts (1)1,676 1,677 5,028 5,020 
Other comprehensive income (loss)1,665
 6,902
 (1,765) (82,840)Other comprehensive income (loss)2,764 2,704 10,510 (4,332)
Comprehensive income149,369
 78,406
 428,513
 322,243
Comprehensive income142,014 120,764 419,157 989,454 
Net income attributable to noncontrolling interests(27,742) 7,838
 (74,317) (42,173)Net income attributable to noncontrolling interests(30,953)(25,581)(87,995)(131,370)
Other comprehensive income (loss) attributable to noncontrolling interests(300) (1,097) 2,220
 23,011
Other comprehensive (income) loss attributable to noncontrolling interestsOther comprehensive (income) loss attributable to noncontrolling interests(401)(405)(1,423)45 
Comprehensive income attributable to Boston Properties, Inc.$121,327
 $85,147
 $356,416
 $303,081
Comprehensive income attributable to Boston Properties, Inc.$110,660 $94,778 $329,739 $858,129 
_______________
(1)Amounts reclassified from comprehensive income primarily to interest expense within the Boston Properties, Inc.’s Consolidated Statements of Operations.
































































The accompanying notes are an integral part of these consolidated financial statements.

4

Table of Contents

BOSTON PROPERTIES, INC.
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
(Unaudited and in thousands)
BOSTON PROPERTIES, INC.
CONSOLIDATED STATEMENTS OF EQUITY
 (unaudited and in thousands)
 Common StockPreferred StockAdditional Paid-in CapitalDividends in Excess of EarningsTreasury Stock,
at cost		Accumulated Other Comprehensive LossNoncontrolling Interests - Common UnitsNoncontrolling Interests - Property PartnershipsTotal
 SharesAmount
Equity, June 30, 2021156,136 $1,561 $— $6,405,916 $(612,247)$(2,722)$(43,166)$615,308 $1,725,343 $8,089,993 
Redemption of operating partnership units to common stock50 1 — 1,747 — — — (1,748)— — 
Allocated net income for the period— — — — 108,308 — — 11,971 18,971 139,250 
Dividends/distributions declared— — — — (153,082)— — (17,203)— (170,285)
Shares issued pursuant to stock purchase plan4 — — 520 — — — — — 520 
Net activity from stock option and incentive plan16 — — 1,185 — — — 7,679 — 8,864 
Contributions from noncontrolling interests in property partnerships— — — — — — — — 11,318 11,318 
Distributions to noncontrolling interests in property partnerships— — — — — — — — (27,675)(27,675)
Effective portion of interest rate contracts— — — — — — 981 107 — 1,088 
Amortization of interest rate contracts— — — — — — 1,382 150 144 1,676 
Reallocation of noncontrolling interest— — — 6,434 — — — (6,434)— — 
Equity, September 30, 2021156,206 $1,562 $— $6,415,802 $(657,021)$(2,722)$(40,803)$609,830 $1,728,101 $8,054,749 
Equity, June 30, 2020155,622 $1,556 $200,000 $6,340,665 $(302,511)$(2,722)$(54,921)$640,491 $1,724,588 8,547,146 
Redemption of operating partnership units to common stock9 — — 338 — — — (338)— — 
Allocated net income for the period— — — — 92,934 — — 9,565 15,561 118,060 
Dividends/distributions declared— — — — (155,143)— — (17,183)— (172,326)
Shares issued pursuant to stock purchase plan5 — — 434 — — — — — 434 
Net activity from stock option and incentive plan— — — 1,390 — — — 7,249 — 8,639 
Contributions from noncontrolling interests in property partnerships— — — — — — — — 1,407 1,407 
Distributions to noncontrolling interests in property partnerships— — — — — — — — (11,026)(11,026)
Effective portion of interest rate contracts— — — — — — 917 110 — 1,027 
Amortization of interest rate contracts— — — — — — 1,382 151 144 1,677 
Reallocation of noncontrolling interest— — — 5,249 — — — (5,249)— — 
Equity, September 30, 2020155,636 $1,556 $200,000 $6,348,076 $(364,720)$(2,722)$(52,622)$634,796 $1,730,674 $8,495,038 
5
Table of Contents
 Common Stock Preferred Stock 
Additional
Paid-in
Capital
 
Dividends in
Excess of
Earnings
 
Treasury
Stock,
at cost
 
Accumulated
Other
Comprehensive Loss
 
Noncontrolling
Interests
 Total
 Shares Amount  
Equity, December 31, 2016153,790
 $1,538
 $200,000
 $6,333,424
 $(693,694) $(2,722) $(52,251) $2,145,629
 $7,931,924
Redemption of operating partnership units to common stock492
 5
 —
 16,807
 —
 —
 —
 (16,812) —
Allocated net income for the year—
 —
 —
 —
 355,961
 —
 —
 74,317
 430,278
Dividends/distributions declared—
 —
 —
 —
 (354,734) —
 —
 (40,292) (395,026)
Shares issued pursuant to stock purchase plan6
 —
 —
 795
 —
 —
 —
 —
 795
Net activity from stock option and incentive plan34
 —
 —
 2,920
 —
 —
 —
 26,271
 29,191
Cumulative effect of a change in accounting principle—
 —
 —
 —
 (272) —
 —
 (1,763) (2,035)
Contributions from noncontrolling interests in property partnerships—
 —
 —
 —
 —
 —
 —
 147,772
 147,772
Distributions to noncontrolling interests in property partnerships—
 —
 —
 —
 —
 —
 —
 (41,439) (41,439)
Effective portion of interest rate contracts—
 —
 —
 —
 —
 —
 (3,304) (2,829) (6,133)
Amortization of interest rate contracts—
 —
 —
 —
 —
 —
 3,759
 609
 4,368
Reallocation of noncontrolling interest—
 —
 —
 16,986
 —
 —
 —
 (16,986) —
Equity, September 30, 2017154,322
 $1,543
 $200,000
 $6,370,932
 $(692,739) $(2,722) $(51,796) $2,274,477
 $8,099,695
                  
Equity, December 31, 2015153,580
 $1,536
 $200,000
 $6,305,687
 $(780,952) $(2,722) $(14,114) $2,177,492
 $7,886,927
Redemption of operating partnership units to common stock173
 2
 —
 5,879
 —
 —
 —
 (5,881) —
Allocated net income for the year—
 —
 —
 —
 362,910
 —
 —
 42,173
 405,083
Dividends/distributions declared—
 —
 —
 —
 (307,480) —
 —
 (35,500) (342,980)
Shares issued pursuant to stock purchase plan6
 —
 —
 730
 —
 —
 —
 —
 730
Net activity from stock option and incentive plan14
 —
 —
 2,870
 —
 —
 —
 21,420
 24,290
Sale of interests in property partnerships—
 —
 —
 1,320
 —
 —
 —
 (1,320) —
Contributions from noncontrolling interests in property partnerships—
 —
 —
 —
 —
 —
 —
 6,737
 6,737
Distributions to noncontrolling interests in property partnerships—
 —
 —
 —
 —
 —
 —
 (38,694) (38,694)
Effective portion of interest rate contracts—
 —
 —
 —
 —
 —
 (62,022) (23,263) (85,285)
Amortization of interest rate contracts—
 —
 —
 —
 —
 —
 2,193
 252
 2,445
Reallocation of noncontrolling interest—
 —
 —
 10,094
 —
 —
 —
 (10,094) —
Equity, September 30, 2016153,773
 $1,538
 $200,000
 $6,326,580
 $(725,522) $(2,722) $(73,943) $2,133,322
 $7,859,253




BOSTON PROPERTIES, INC.
CONSOLIDATED STATEMENTS OF EQUITY
 (unaudited and in thousands)
 Common StockPreferred StockAdditional Paid-in CapitalDividends in Excess of EarningsTreasury Stock,
at cost		Accumulated Other Comprehensive LossNoncontrolling Interests - Common UnitsNoncontrolling Interests - Property PartnershipsTotal
 SharesAmount
Equity, December 31, 2020155,719 $1,557 $200,000 $6,356,791 $(509,653)$(2,722)$(49,890)$616,596 $1,726,933 $8,339,612 
Redemption of operating partnership units to common stock227 2 — 8,031 — — — (8,033)— — 
Allocated net income for the period— — — — 320,652 — — 35,393 52,602 408,647 
Dividends/distributions declared— — — — (461,608)— — (51,743)— (513,351)
Shares issued pursuant to stock purchase plan9 — — 1,004 — — — — — 1,004 
Net activity from stock option and incentive plan251 3 — 20,893 — — — 39,332 — 60,228 
Preferred stock redemption— — (200,000)6,377 — — — — — (193,623)
Preferred stock redemption charge— — — — (6,412)— — — — (6,412)
Contributions from noncontrolling interests in property partnerships— — — — — — — — 13,738 13,738 
Distributions to noncontrolling interests in property partnerships— — — — — — — — (65,604)(65,604)
Effective portion of interest rate contracts— — — — — — 4,943 539 — 5,482 
Amortization of interest rate contracts— — — — — — 4,144 452 432 5,028 
Reallocation of noncontrolling interest— — — 22,706 — — — (22,706)— — 
Equity, September 30, 2021156,206 $1,562 $— $6,415,802 $(657,021)$(2,722)$(40,803)$609,830 $1,728,101 $8,054,749 
Equity, December 31, 2019154,790 $1,548 $200,000 $6,294,719 $(760,523)$(2,722)$(48,335)$600,860 $1,728,689 $8,014,236 
Cumulative effect of a change in accounting principle— — — — (1,505)— — (174)— (1,679)
Redemption of operating partnership units to common stock774 8 — 26,674 — — — (26,682)— — 
Allocated net income for the period— — — — 862,416 — — 97,090 34,280 993,786 
Dividends/distributions declared— — — — (465,108)— — (51,821)— (516,929)
Shares issued pursuant to stock purchase plan7 — — 759 — — — — — 759 
Net activity from stock option and incentive plan65 — — 9,646 — — — 32,278 — 41,924 
Contributions from noncontrolling interests in property partnerships— — — — — — — — 7,364 7,364 
Distributions to noncontrolling interests in property partnerships— — — — — — — — (40,091)(40,091)
Effective portion of interest rate contracts— — — — — — (8,416)(936)— (9,352)
Amortization of interest rate contracts— — — — — — 4,129 459 432 5,020 
Reallocation of noncontrolling interest— — — 16,278 — — — (16,278)— — 
Equity, September 30, 2020155,636 $1,556 $200,000 $6,348,076 $(364,720)$(2,722)$(52,622)$634,796 $1,730,674 $8,495,038 
The accompanying notes are an integral part of these consolidated financial statements.

6
5

Table of Contents

BOSTON PROPERTIES, INC.
CONSOLIDATED STATEMENTS OF CASH FLOWS
(Unaudited)
BOSTON PROPERTIES, INC.
CONSOLIDATED STATEMENTS OF CASH FLOWS
(unaudited and in thousands)
 Nine months ended September 30,
 20212020
Cash flows from operating activities:
Net income$408,647 $993,786 
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization539,815 515,738 
Amortization of right of use assets - operating leases3,208 1,667 
Non-cash compensation expense43,098 36,152 
Loss from unconsolidated joint ventures1,745 5,410 
Distributions of net cash flow from operations of unconsolidated joint ventures18,462 22,285 
Gains from investments in securities(3,744)(965)
Allowance for current expected credit losses(758)1,997 
Non-cash portion of interest expense17,584 17,397 
Settlement of accreted debt discount on redemption of unsecured senior notes(6,290)— 
Losses from early extinguishments of debt898 — 
Gains on sales of real estate(8,104)(613,723)
Change in assets and liabilities:
Tenant and other receivables, net13,738 18,543 
Notes receivable, net(419)(395)
Accrued rental income, net(74,283)(85,843)
Prepaid expenses and other assets(61,019)(60,365)
Lease liabilities - operating leases(24,023)1,157 
Accounts payable and accrued expenses26,097 8,273 
Accrued interest payable(18,237)(1,202)
Other liabilities(51,938)(24,868)
Tenant leasing costs(37,618)(52,621)
Total adjustments378,212 (211,363)
Net cash provided by operating activities786,859 782,423 
Cash flows from investing activities:
Acquisitions of real estate(218,679)(135,698)
Construction in progress(381,104)(358,824)
Building and other capital improvements(103,840)(116,894)
Tenant improvements(218,878)(172,401)
Proceeds from sales of real estate— 505,679 
Capital contributions to unconsolidated joint ventures(95,462)(158,374)
Capital distributions from unconsolidated joint ventures122 55,123 
Issuance of notes receivable, net— (9,800)
Proceeds from sale of investment in unconsolidated joint venture17,789 — 
Investments in securities, net1,684 2,778 
Net cash used in investing activities(998,368)(388,411)
Cash flows from financing activities:
Repayments of mortgage notes payable(13,261)(12,795)
Proceeds from unsecured senior notes1,695,996 1,248,125 
Redemption of unsecured senior notes(843,710)— 
Borrowings on unsecured line of credit300,000 265,000 
Repayments of unsecured line of credit(300,000)(265,000)
7
 For the nine months ended September 30,
 2017 2016
 (in thousands)
Cash flows from operating activities:   
Net income$430,278
 $405,083
Adjustments to reconcile net income to net cash provided by operating activities:   
Depreciation and amortization463,288
 516,371
Impairment loss—
 1,783
Non-cash compensation expense27,260
 25,290
Income from unconsolidated joint ventures(7,035) (5,489)
Distributions of net cash flow from operations of unconsolidated joint ventures8,563
 11,645
Gains from investments in securities(2,716) (1,713)
(Gains) losses from early extinguishments of debt(14,444) 371
Non-cash portion of interest expense(6,667) (27,386)
Gains on sales of real estate(6,791) (80,606)
Change in assets and liabilities:   
Cash held in escrows7,795
 1,675
Tenant and other receivables, net12,528
 22,135
Accrued rental income, net(36,012) (14,618)
Prepaid expenses and other assets(13,633) 4,883
Accounts payable and accrued expenses7,861
 16,852
Accrued interest payable(144,833) 44,242
Other liabilities(65,031) (114,321)
Tenant leasing costs(67,699) (62,412)
Total adjustments162,434
 338,702
Net cash provided by operating activities592,712
 743,785
Cash flows from investing activities:   
Acquisitions of real estate(15,953) (78,000)
Construction in progress(452,283) (359,716)
Building and other capital improvements(162,395) (81,842)
Tenant improvements(152,749) (167,762)
Proceeds from sales of real estate29,810
 122,750
Proceeds from sales of real estate placed in escrow(29,810) (122,647)
Proceeds from sales of real estate released from escrow16,640
 122,647
Cash released from escrow for investing activities9,638
 6,694
Cash released from escrow for land sale contracts—
 1,403
Cash placed in escrow for investment in unconsolidated joint venture(25,000) —
Capital contributions to unconsolidated joint ventures(89,874) (546,982)
Capital distributions from unconsolidated joint ventures251,000
 —
Investments in securities, net(1,451) (929)
Net cash used in investing activities(622,427) (1,104,384)
    
    
    

6

Table of Contents

BOSTON PROPERTIES, INC.
CONSOLIDATED STATEMENTS OF CASH FLOWS
(unaudited and in thousands)
 Nine months ended September 30,
 20212020
Repayment of unsecured term loan(500,000)— 
Redemption of preferred stock(200,000)— 
Payments on finance lease obligations1,250 — 
Deferred financing costs(20,770)(10,416)
Debt prepayment and extinguishment costs(185)— 
Net proceeds from equity transactions20,028 3,276 
Dividends and distributions(513,381)(516,572)
Contributions from noncontrolling interests in property partnerships13,738 7,364 
Distributions to noncontrolling interests in property partnerships(65,604)(40,091)
Net cash provided by (used in) financing activities(425,899)678,891 
Net increase (decrease) in cash and cash equivalents and cash held in escrows(637,408)1,072,903 
Cash and cash equivalents and cash held in escrows, beginning of period1,719,329 691,886 
Cash and cash equivalents and cash held in escrows, end of period$1,081,921 $1,764,789 
Reconciliation of cash and cash equivalents and cash held in escrows:
Cash and cash equivalents, beginning of period$1,668,742 $644,950 
Cash held in escrows, beginning of period50,587 46,936 
Cash and cash equivalents and cash held in escrows, beginning of period$1,719,329 $691,886 
Cash and cash equivalents, end of period$1,002,728 $1,714,783 
Cash held in escrows, end of period79,193 50,006 
Cash and cash equivalents and cash held in escrows, end of period$1,081,921 $1,764,789 
Supplemental disclosures:
Cash paid for interest$358,015 $335,591 
Interest capitalized$36,632 $41,329 
Non-cash investing and financing activities:
Write-off of fully depreciated real estate$(159,108)$(73,584)
Change in real estate included in accounts payable and accrued expenses$(22,104)$(30,924)
Right-of-use assets obtained in exchange for lease liabilities$26,887 $— 
Accrued rental income, net deconsolidated$— $(4,558)
Tenant leasing costs, net deconsolidated$— $(3,462)
Building and other capital improvements, net deconsolidated$— $(111,889)
Tenant improvements, net deconsolidated$— $(12,331)
Investment in unconsolidated joint venture recorded upon deconsolidation$— $347,898 
Dividends and distributions declared but not paid$169,739 $171,070 
Conversions of noncontrolling interests to stockholders’ equity$8,033 $26,682 
Issuance of restricted securities to employees and non-employee directors$44,257 $43,244 
BOSTON PROPERTIES, INC.
CONSOLIDATED STATEMENTS OF CASH FLOWS
(Unaudited)
 For the nine months ended September 30,
 2017 2016
 (in thousands)
Cash flows from financing activities:   
Proceeds from mortgage notes payable2,300,000
 —
Repayments of mortgage notes payable(1,313,890) (1,323,284)
Proceeds from unsecured senior notes—
 1,989,790
Borrowings on unsecured line of credit470,000
 —
Repayments of unsecured line of credit(470,000) —
Repayments of mezzanine notes payable(306,000) —
Repayments of outside members’ notes payable(70,424) —
Payments on capital lease obligations(373) —
Payments on real estate financing transactions(1,306) (4,712)
Deposit on mortgage note payable interest rate lock(23,200) —
Return of deposit on mortgage note payable interest rate lock23,200
 —
Deferred financing costs(44,083) (16,101)
Net proceeds from equity transactions241
 (270)
Dividends and distributions(394,900) (557,262)
Contributions from noncontrolling interests in property partnerships38,196
 6,737
Distributions to noncontrolling interests in property partnerships(41,605) (38,694)
Net cash provided by financing activities165,856
 56,204
Net increase (decrease) in cash and cash equivalents136,141
 (304,395)
Cash and cash equivalents, beginning of period356,914
 723,718
Cash and cash equivalents, end of period$493,055
 $419,323
Supplemental disclosures:   
Cash paid for interest$477,189
 $327,053
Interest capitalized$43,286
 $28,956
Non-cash investing and financing activities:   
Write-off of fully depreciated real estate$(103,972) $(168,861)
Additions to real estate included in accounts payable and accrued expenses$36,609
 $11,864
Real estate acquired through capital lease$28,962
 $—
Outside members’ notes payable contributed to noncontrolling interests in property partnerships$109,576
 $—
Dividends and distributions declared but not paid$130,434
 $113,038
Conversions of noncontrolling interests to stockholders’ equity$16,812
 $5,881
Issuance of restricted securities to employees$35,711
 $33,711




The accompanying notes are an integral part of these consolidated financial statements.

8
7

Table of Contents



BOSTON PROPERTIES LIMITED PARTNERSHIP
CONSOLIDATED BALANCE SHEETS
(unaudited and in thousands, except for unit amounts)
September 30,
2021		December 31,
2020
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,688,647 and $6,592,019 at September 30, 2021 and December 31, 2020, respectively)$23,335,905 $22,592,301 
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at September 30, 2021 and December 31, 2020, respectively)237,845 237,393 
Right of use assets - operating leases170,085 146,406 
Less: accumulated depreciation (amounts related to VIEs of $(1,266,516) and $(1,158,548) at September 30, 2021 and December 31, 2020, respectively)(5,739,625)(5,428,576)
Total real estate18,004,210 17,547,524 
Cash and cash equivalents (amounts related to VIEs of $288,186 and $340,642 at September 30, 2021 and December 31, 2020, respectively)1,002,728 1,668,742 
Cash held in escrows79,193 50,587 
Investments in securities41,517 39,457 
Tenant and other receivables, net (amounts related to VIEs of $8,598 and $10,911 at September 30, 2021 and December 31, 2020, respectively)61,269 77,411 
Related party note receivable, net78,144 77,552 
Notes receivable, net19,297 18,729 
Accrued rental income, net (amounts related to VIEs of $352,291 and $336,594 at September 30, 2021 and December 31, 2020, respectively)1,203,840 1,122,502 
Deferred charges, net (amounts related to VIEs of $174,172 and $183,306 at September 30, 2021 and December 31, 2020, respectively)622,807 640,085 
Prepaid expenses and other assets (amounts related to VIEs of $42,051 and $13,137 at September 30, 2021 and December 31, 2020, respectively)97,560 33,840 
Investments in unconsolidated joint ventures1,373,522 1,310,478 
Total assets$22,584,087 $22,586,907 
LIABILITIES AND CAPITAL
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $2,898,699 and $2,907,590 at September 30, 2021 and December 31, 2020, respectively)$2,898,699 $2,909,081 
Unsecured senior notes, net10,479,651 9,639,287 
Unsecured line of credit— — 
Unsecured term loan, net— 499,390 
Lease liabilities - finance leases (amounts related to VIEs of $20,420 and $20,306 at September 30, 2021 and December 31, 2020, respectively)243,562 236,492 
Lease liabilities - operating leases204,137 201,713 
Accounts payable and accrued expenses (amounts related to VIEs of $36,967 and $23,128 at September 30, 2021 and December 31, 2020, respectively)331,687 336,264 
Dividends and distributions payable169,739 171,082 
Accrued interest payable87,408 106,288 
Other liabilities (amounts related to VIEs of $124,615 and $158,805 at September 30, 2021 and December 31, 2020, respectively)370,403 412,084 
Total liabilities14,785,286 14,511,681 
Commitments and contingencies (See Note 9)
Redeemable deferred stock units— 80,989 and 72,966 units outstanding at redemption value at September 30, 2021 and December 31, 2020, respectively8,775 6,897 
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BOSTON PROPERTIES LIMITED PARTNERSHIP
CONSOLIDATED BALANCE SHEETS
(Unaudited)
 September 30, 2017 December 31, 2016
 (in thousands, except for unit amounts)
ASSETS   
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $7,084,588 and $6,760,078 at September 30, 2017 and December 31, 2016, respectively)$20,447,767
 $19,733,872
Less: accumulated depreciation (amounts related to VIEs of $(825,390) and $(758,640) at September 30, 2017 and December 31, 2016, respectively)(4,394,077) (4,136,364)
Total real estate16,053,690
 15,597,508
Cash and cash equivalents (amounts related to VIEs of $285,089 and $253,999 at September 30, 2017 and December 31, 2016, respectively)493,055
 356,914
Cash held in escrows (amounts related to VIEs of $6,179 and $4,955 at September 30, 2017 and December 31, 2016, respectively)83,779
 63,174
Investments in securities27,981
 23,814
Tenant and other receivables (amounts related to VIEs of $19,891 and $23,525 at September 30, 2017 and December 31, 2016, respectively)79,750
 92,548
Accrued rental income (amounts related to VIEs of $232,336 and $224,185 at September 30, 2017 and December 31, 2016, respectively)835,415
 799,138
Deferred charges, net (amounts related to VIEs of $268,727 and $290,436 at September 30, 2017 and December 31, 2016, respectively)657,474
 686,163
Prepaid expenses and other assets (amounts related to VIEs of $68,330 and $42,718 at September 30, 2017 and December 31, 2016, respectively)144,817
 129,666
Investments in unconsolidated joint ventures611,800
 775,198
Total assets$18,987,761
 $18,524,123
LIABILITIES AND CAPITAL   
Liabilities:   
Mortgage notes payable, net (amounts related to VIEs of $2,941,550 and $2,018,483 at September 30, 2017 and December 31, 2016, respectively)$2,982,067
 $2,063,087
Unsecured senior notes, net7,252,567
 7,245,953
Unsecured line of credit—
 —
Unsecured term loan—
 —
Mezzanine notes payable (amounts related to VIEs of $0 and $307,093 at September 30, 2017 and December 31, 2016, respectively)—
 307,093
Outside members’ notes payable (amounts related to VIEs of $0 and $180,000 at September 30, 2017 and December 31, 2016, respectively)—
 180,000
Accounts payable and accrued expenses (amounts related to VIEs of $106,772 and $110,457 at September 30, 2017 and December 31, 2016, respectively)325,440
 298,524
Distributions payable130,434
 130,308
Accrued interest payable (amounts related to VIEs of $6,800 and $162,226 at September 30, 2017 and December 31, 2016, respectively)99,100
 243,933
Other liabilities (amounts related to VIEs of $146,517 and $175,146 at September 30, 2017 and December 31, 2016, respectively)419,215
 450,821
Total liabilities11,208,823
 10,919,719
Commitments and contingencies—
 —
Noncontrolling interests:   
Redeemable partnership units—16,812,329 and 17,079,511 common units and 816,982 and 904,588 long term incentive units outstanding at redemption value at September 30, 2017 and December 31, 2016, respectively2,166,290
 2,262,040
Capital:   
5.25% Series B cumulative redeemable preferred units, liquidation preference $2,500 per unit, 80,000 units issued and outstanding at September 30, 2017 and December 31, 2016193,623
 193,623
Boston Properties Limited Partnership partners’ capital—1,719,516 and 1,717,743 general partner units and 152,602,750 and 152,072,432 limited partner units outstanding at September 30, 2017 and December 31, 2016, respectively3,750,350
 3,618,094
Noncontrolling interests in property partnerships1,668,675
 1,530,647
Total capital5,612,648
 5,342,364
Total liabilities and capital$18,987,761
 $18,524,123
BOSTON PROPERTIES LIMITED PARTNERSHIP
CONSOLIDATED BALANCE SHEETS
(unaudited and in thousands, except for unit amounts)
September 30,
2021		December 31,
2020
Noncontrolling interests:
Redeemable partnership units— 15,989,304 and 16,037,121 common units and 1,487,492 and 1,336,115 long term incentive units outstanding at redemption value at September 30, 2021 and December 31, 2020, respectively1,893,611 1,643,024 
Capital:
5.25% Series B cumulative redeemable preferred units, liquidation preference $2,500 per unit, 80,000 units issued and outstanding at December 31, 2020— 193,623 
Boston Properties Limited Partnership partners’ capital— 1,736,833 and 1,730,921 general partner units and 154,469,658 and 153,987,904 limited partner units outstanding at September 30, 2021 and December 31, 2020, respectively4,209,117 4,554,639 
Accumulated other comprehensive loss(40,803)(49,890)
Total partners’ capital4,168,314 4,698,372 
Noncontrolling interests in property partnerships1,728,101 1,726,933 
Total capital5,896,415 6,425,305 
Total liabilities and capital$22,584,087 $22,586,907 




























The accompanying notes are an integral part of these consolidated financial statements.

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BOSTON PROPERTIES LIMITED PARTNERSHIP
CONSOLIDATED STATEMENTS OF OPERATIONS
(Unaudited)(unaudited and in thousands, except for per unit amounts)
 Three months ended September 30,Nine months ended September 30,
 2021202020212020
Revenue
Lease$692,260 $666,674 $2,062,102 $2,006,904 
Parking and other23,507 16,327 58,727 54,777 
Hotel5,189 90 7,382 7,014 
Development and management services6,094 7,281 20,181 23,285 
Direct reimbursements of payroll and related costs from management services contracts3,006 2,896 9,166 8,617 
Total revenue730,056 693,268 2,157,558 2,100,597 
Expenses
Operating
Rental258,281 258,261 764,373 761,014 
Hotel3,946 3,164 7,993 11,958 
General and administrative34,560 27,862 117,924 102,059 
Payroll and related costs from management services contracts3,006 2,896 9,166 8,617 
Transaction costs1,888 307 2,970 1,254 
Depreciation and amortization177,677 164,706 533,255 510,400 
Total expenses479,358 457,196 1,435,681 1,395,302 
Other income (expense)
Loss from unconsolidated joint ventures(5,597)(6,873)(1,745)(5,410)
Gains (losses) on sales of real estate348 (209)8,104 626,686 
Interest and other income (loss)1,520 (45)4,140 4,277 
Gains (losses) from investments in securities(190)1,858 3,744 965 
Losses from early extinguishment of debt— — (898)— 
Interest expense(105,794)(110,993)(320,015)(319,726)
Net income140,985 119,810 415,207 1,012,087 
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnerships(18,971)(15,561)(52,602)(34,280)
Net income attributable to Boston Properties Limited Partnership122,014 104,249 362,605 977,807 
Preferred distributions— (2,625)(2,560)(7,875)
Preferred unit redemption charge— — (6,412)— 
Net income attributable to Boston Properties Limited Partnership common unitholders$122,014 $101,624 $353,633 $969,932 
Basic earnings per common unit attributable to Boston Properties Limited Partnership
Net income$0.70 $0.59 $2.04 $5.61 
Weighted average number of common units outstanding173,194 172,677 173,078 172,628 
Diluted earnings per common unit attributable to Boston Properties Limited Partnership
Net income$0.70 $0.59 $2.04 $5.61 
Weighted average number of common and common equivalent units outstanding173,609 172,702 173,410 172,726 
 Three months ended September 30, Nine months ended September 30,
 2017 2016 2017 2016
 (in thousands, except for per unit amounts)
Revenue       
Rental       
Base rent$513,269
 $489,312
 $1,537,373
 $1,518,826
Recoveries from tenants94,476
 92,560
 272,803
 267,852
Parking and other26,092
 24,638
 78,164
 75,576
Total rental revenue633,837
 606,510
 1,888,340
 1,862,254
Hotel revenue13,064
 12,354
 33,859
 33,919
Development and management services10,811
 6,364
 24,648
 18,586
Total revenue657,712
 625,228
 1,946,847
 1,914,759
Expenses       
Operating       
Rental237,341
 228,560
 696,082
 665,670
Hotel8,447
 8,118
 23,942
 23,730
General and administrative25,792
 25,165
 84,319
 79,936
Transaction costs239
 249
 572
 1,187
Impairment loss—
 1,783
 —
 1,783
Depreciation and amortization150,210
 198,582
 457,102
 507,234
Total expenses422,029
 462,457
 1,262,017
 1,279,540
Operating income235,683
 162,771
 684,830
 635,219
Other income (expense)       
Income from unconsolidated joint ventures843
 1,464
 7,035
 5,489
Interest and other income1,329
 3,628
 3,447
 6,657
Gains from investments in securities944
 976
 2,716
 1,713
Gains (losses) from early extinguishments of debt—
 (371) 14,354
 (371)
Losses from interest rate contracts—
 (140) —
 (140)
Interest expense(92,032) (104,641) (282,709) (314,953)
Income before gains on sales of real estate146,767
 63,687
 429,673
 333,614
Gains on sales of real estate2,891
 12,983
 7,368
 82,775
Net income149,658
 76,670
 437,041
 416,389
Net income attributable to noncontrolling interests       
Noncontrolling interests in property partnerships(14,340) 17,225
 (33,967) (53)
Net income attributable to Boston Properties Limited Partnership135,318
 93,895
 403,074
 416,336
Preferred distributions(2,625) (2,589) (7,875) (7,796)
Net income attributable to Boston Properties Limited Partnership common unitholders$132,693
 $91,306
 $395,199
 $408,540
Basic earnings per common unit attributable to Boston Properties Limited Partnership common unitholders:       
Net income$0.77
 $0.53
 $2.30
 $2.38
Weighted average number of common units outstanding171,691
 171,379
 171,649
 171,353
Diluted earnings per common unit attributable to Boston Properties Limited Partnership common unitholders:       
Net income$0.77
 $0.53
 $2.30
 $2.38
Weighted average number of common and common equivalent units outstanding171,819
 171,761
 171,861
 171,643
        
Distributions per common unit$0.75
 $0.65
 $2.25
 $1.95


The accompanying notes are an integral part of these consolidated financial statements.

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BOSTON PROPERTIES LIMITED PARTNERSHIP
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
(Unaudited)(unaudited and in thousands)
 
Three months ended September 30, Nine months ended September 30,
2017 2016 2017 2016 Three months ended September 30,Nine months ended September 30,
(in thousands) 2021202020212020
Net income$149,658
 $76,670
 $437,041
 $416,389
Net income$140,985 $119,810 $415,207 $1,012,087 
Other comprehensive income (loss):       Other comprehensive income (loss):
Effective portion of interest rate contracts—
 5,712
 (6,133) (85,285)Effective portion of interest rate contracts1,088 1,027 5,482 (9,352)
Amortization of interest rate contracts (1)1,665
 1,190
 4,368
 2,445
Amortization of interest rate contracts (1)1,676 1,677 5,028 5,020 
Other comprehensive income (loss)1,665
 6,902
 (1,765) (82,840)Other comprehensive income (loss)2,764 2,704 10,510 (4,332)
Comprehensive income151,323
 83,572
 435,276
 333,549
Comprehensive income143,749 122,514 425,717 1,007,755 
Comprehensive income attributable to noncontrolling interests(14,484) 16,812
 (31,695) 16,081
Comprehensive income attributable to noncontrolling interests(19,115)(15,705)(53,034)(34,712)
Comprehensive income attributable to Boston Properties Limited Partnership$136,839
 $100,384
 $403,581
 $349,630
Comprehensive income attributable to Boston Properties Limited Partnership$124,634 $106,809 $372,683 $973,043 
_______________
(1)Amounts reclassified from comprehensive income primarily to interest expense within the Boston Properties Limited Partnership'sPartnership’s Consolidated Statements of Operations.





































































The accompanying notes are an integral part of these consolidated financial statements.

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BOSTON PROPERTIES LIMITED PARTNERSHIP
CONSOLIDATED STATEMENTS OF PARTNERS’ CAPITAL
FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2017 AND 2016
(Unaudited and in thousands)
BOSTON PROPERTIES LIMITED PARTNERSHIP
CONSOLIDATED STATEMENTS OF CAPITAL AND NONCONTROLLING INTERESTS
(unaudited and in thousands)
UnitsCapital
 General PartnerLimited PartnerPartners’ Capital (General and Limited Partners)Preferred UnitsAccumulated
Other
Comprehensive Loss		Noncontrolling
Interests - Property Partnerships		Total CapitalNoncontrolling Interests - Redeemable Partnership Units
Equity, June 30, 20211,737 154,399 $4,132,880 $— $(43,166)$1,725,343 $5,815,057 $2,008,478 
Net activity from contributions and unearned compensation— 21 1,705 — — — 1,705 7,679 
Allocated net income for the period— — 110,043 — — 18,971 129,014 11,971 
Distributions— — (153,082)— — — (153,082)(17,203)
Conversion of redeemable partnership units— 50 1,748 — — — 1,748 (1,748)
Adjustment to reflect redeemable partnership units at redemption value— — 115,823 — — — 115,823 (115,823)
Effective portion of interest rate contracts— — — — 981 — 981 107 
Amortization of interest rate contracts— — — — 1,382 144 1,526 150 
Contributions from noncontrolling interests in property partnerships— — — — — 11,318 11,318 — 
Distributions to noncontrolling interests in property partnerships— — — — — (27,675)(27,675)— 
Equity, September 30, 20211,737 154,470 $4,209,117 $— $(40,803)$1,728,101 $5,896,415 $1,893,611 
Equity, June 30, 20201,731 153,891 $4,828,066 $193,623 $(54,921)$1,724,588 $6,691,356 $1,581,010 
Net activity from contributions and unearned compensation— 5 1,824 — — — 1,824 7,249 
Allocated net income (loss) for the period— — 92,059 2,625 — 15,561 110,245 9,565 
Distributions— — (152,518)(2,625)— — (155,143)(17,183)
Conversion of redeemable partnership units— 9 338 — — — 338 (338)
Adjustment to reflect redeemable partnership units at redemption value— — 174,080 — — — 174,080 (174,080)
Effective portion of interest rate contracts— — — — 917 — 917 110 
Amortization of interest rate contracts— — — — 1,382 144 1,526 151 
Contributions from noncontrolling interests in property partnerships— — — — — 1,407 1,407 — 
Distributions to noncontrolling interests in property partnerships— — — — — (11,026)(11,026)— 
Equity, September 30, 20201,731 153,905 $4,943,849 $193,623 $(52,622)$1,730,674 $6,815,524 $1,406,484 
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 Total Partners’ Capital
Balance at December 31, 2016$3,811,717
Contributions4,937
Net income allocable to general and limited partner units362,724
Distributions(354,734)
Accumulated other comprehensive income455
Cumulative effect of a change in accounting principle(272)
Unearned compensation(1,222)
Conversion of redeemable partnership units16,812
Adjustment to reflect redeemable partnership units at redemption value103,556
Balance at September 30, 2017$3,943,973
  
Balance at December 31, 2015$3,684,522
Contributions3,269
Net income allocable to general and limited partner units374,216
Distributions(307,480)
Accumulated other comprehensive loss(59,829)
Unearned compensation1,651
Conversion of redeemable partnership units5,881
Adjustment to reflect redeemable partnership units at redemption value(151,545)
Balance at September 30, 2016$3,550,685
BOSTON PROPERTIES LIMITED PARTNERSHIP
CONSOLIDATED STATEMENTS OF CAPITAL AND NONCONTROLLING INTERESTS
(unaudited and in thousands)
UnitsCapital
 General PartnerLimited PartnerPartners’ Capital (General and Limited Partners)Preferred UnitsAccumulated
Other
Comprehensive Loss		Noncontrolling
Interests - Property Partnerships		Total CapitalNoncontrolling Interests - Redeemable Partnership Units
Equity, December 31, 20201,731 153,988 $4,554,639 $193,623 $(49,890)$1,726,933 $6,425,305 $1,643,024 
Net activity from contributions and unearned compensation4 255 21,900 — — — 21,900 39,332 
Allocated net income for the period— — 324,652 2,560 — 52,602 379,814 35,393 
Distributions— — (459,048)(2,560)— — (461,608)(51,743)
Preferred unit redemption— — — (193,623)— — (193,623)— 
Preferred unit redemption charge— — (6,412)— — — (6,412)— 
Conversion of redeemable partnership units2 227 8,033 — — — 8,033 (8,033)
Adjustment to reflect redeemable partnership units at redemption value— — (234,647)— — — (234,647)234,647 
Effective portion of interest rate contracts— — — — 4,943 — 4,943 539 
Amortization of interest rate contracts— — — — 4,144 432 4,576 452 
Contributions from noncontrolling interests in property partnerships— — — — — 13,738 13,738 — 
Distributions to noncontrolling interests in property partnerships— — — — — (65,604)(65,604)— 
Equity, September 30, 20211,737 154,470 $4,209,117 $— $(40,803)$1,728,101 $5,896,415 $1,893,611 
Equity, December 31, 20191,727 153,063 $3,380,175 $193,623 $(48,335)$1,728,689 $5,254,152 $2,468,753 
Cumulative effect of a change in accounting principle
— — (1,505)— — — (1,505)(174)
Net activity from contributions and unearned compensation1 73 10,405 — — — 10,405 32,278 
Allocated net income for the period— — 872,842 7,875 — 34,280 914,997 97,090 
Distributions— — (457,233)(7,875)— — (465,108)(51,821)
Conversion of redeemable partnership units3 769 26,682 — — — 26,682 (26,682)
Adjustment to reflect redeemable partnership units at redemption value— — 1,112,483 — — — 1,112,483 (1,112,483)
Effective portion of interest rate contracts— — — — (8,416)— (8,416)(936)
Amortization of interest rate contracts— — — — 4,129 432 4,561 459 
Contributions from noncontrolling interests in property partnerships— — — — — 7,364 7,364 — 
Distributions to noncontrolling interests in property partnerships— — — — — (40,091)(40,091)— 
Equity, September 30, 20201,731 153,905 $4,943,849 $193,623 $(52,622)$1,730,674 $6,815,524 $1,406,484 

























The accompanying notes are an integral part of these consolidated financial statements.

14

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BOSTON PROPERTIES LIMITED PARTNERSHIP
CONSOLIDATED STATEMENTS OF CASH FLOWS
(unaudited and in thousands)
 Nine months ended September 30,
 20212020
Cash flows from operating activities:
Net income$415,207 $1,012,087 
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization533,255 510,400 
Amortization of right of use assets - operating leases3,208 1,667 
Non-cash compensation expense43,098 36,152 
Loss from unconsolidated joint ventures1,745 5,410 
Distributions of net cash flow from operations of unconsolidated joint ventures18,462 22,285 
Gains from investments in securities(3,744)(965)
Allowance for current expected credit losses(758)1,997 
Non-cash portion of interest expense17,584 17,397 
Settlement of accreted debt discount on redemption of unsecured senior notes(6,290)— 
Losses from early extinguishments of debt898 — 
Gains on sales of real estate(8,104)(626,686)
Change in assets and liabilities:
Tenant and other receivables, net13,738 18,543 
Notes receivable, net(419)(395)
Accrued rental income, net(74,283)(85,843)
Prepaid expenses and other assets(61,019)(60,365)
Lease liabilities - operating leases(24,023)1,157 
Accounts payable and accrued expenses26,097 8,273 
Accrued interest payable(18,237)(1,202)
Other liabilities(51,938)(24,868)
Tenant leasing costs(37,618)(52,621)
Total adjustments371,652 (229,664)
Net cash provided by operating activities786,859 782,423 
Cash flows from investing activities:
Acquisitions of real estate(218,679)(135,698)
Construction in progress(381,104)(358,824)
Building and other capital improvements(103,840)(116,894)
Tenant improvements(218,878)(172,401)
Proceeds from sales of real estate— 505,679 
Capital contributions to unconsolidated joint ventures(95,462)(158,374)
Capital distributions from unconsolidated joint ventures122 55,123 
Proceeds from sale of investment in unconsolidated joint venture17,789 — 
Issuance of notes receivable, net— (9,800)
Investments in securities, net1,684 2,778 
Net cash used in investing activities(998,368)(388,411)
Cash flows from financing activities:
Repayments of mortgage notes payable(13,261)(12,795)
Proceeds from unsecured senior notes1,695,996 1,248,125 
Redemption of unsecured senior notes(843,710)— 
Borrowings on unsecured line of credit300,000 265,000 
Repayments of unsecured line of credit(300,000)(265,000)
15
BOSTON PROPERTIES LIMITED PARTNERSHIP
CONSOLIDATED STATEMENTS OF CASH FLOWS
(Unaudited) 
 For the nine months ended September 30,
 2017 2016
 (in thousands)
Cash flows from operating activities:   
Net income$437,041
 $416,389
Adjustments to reconcile net income to net cash provided by operating activities:   
Depreciation and amortization457,102
 507,234
Impairment loss—
 1,783
Non-cash compensation expense27,260
 25,290
Income from unconsolidated joint ventures(7,035) (5,489)
Distributions of net cash flow from operations of unconsolidated joint ventures8,563
 11,645
Gains from investments in securities(2,716) (1,713)
(Gains) losses from early extinguishments of debt(14,444) 371
Non-cash portion of interest expense(6,667) (27,386)
Gains on sales of real estate(7,368) (82,775)
Change in assets and liabilities:   
Cash held in escrows7,795
 1,675
Tenant and other receivables, net12,528
 22,135
Accrued rental income, net(36,012) (14,618)
Prepaid expenses and other assets(13,633) 4,883
Accounts payable and accrued expenses7,861
 16,852
Accrued interest payable(144,833) 44,242
Other liabilities(65,031) (114,321)
Tenant leasing costs(67,699) (62,412)
Total adjustments155,671
 327,396
Net cash provided by operating activities592,712
 743,785
Cash flows from investing activities:   
Acquisitions of real estate(15,953) (78,000)
Construction in progress(452,283) (359,716)
Building and other capital improvements(162,395) (81,842)
Tenant improvements(152,749) (167,762)
Proceeds from sales of real estate29,810
 122,750
Proceeds from sales of real estate placed in escrow(29,810) (122,647)
Proceeds from sales of real estate released from escrow16,640
 122,647
Cash released from escrow for investing activities9,638
 6,694
Cash released from escrow for land sale contracts—
 1,403
Cash placed in escrow for investment in unconsolidated joint venture(25,000) —
Capital contributions to unconsolidated joint ventures(89,874) (546,982)
Capital distributions from unconsolidated joint ventures251,000
 —
Investments in securities, net(1,451) (929)
Net cash used in investing activities(622,427) (1,104,384)
    
    

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BOSTON PROPERTIES LIMITED PARTNERSHIP
CONSOLIDATED STATEMENTS OF CASH FLOWS
(unaudited and in thousands)
 Nine months ended September 30,
 20212020
Repayment of unsecured term loan(500,000)— 
Redemption of preferred units(200,000)— 
Payments on finance lease obligations1,250 — 
Deferred financing costs(20,770)(10,416)
Debt prepayment and extinguishment costs(185)— 
Net proceeds from equity transactions20,028 3,276 
Distributions(513,381)(516,572)
Contributions from noncontrolling interests in property partnerships13,738 7,364 
Distributions to noncontrolling interests in property partnerships(65,604)(40,091)
Net cash provided by (used in) financing activities(425,899)678,891 
Net increase (decrease) in cash and cash equivalents and cash held in escrows(637,408)1,072,903 
Cash and cash equivalents and cash held in escrows, beginning of period1,719,329 691,886 
Cash and cash equivalents and cash held in escrows, end of period$1,081,921 $1,764,789 
Reconciliation of cash and cash equivalents and cash held in escrows:
Cash and cash equivalents, beginning of period$1,668,742 $644,950 
Cash held in escrows, beginning of period50,587 46,936 
Cash and cash equivalents and cash held in escrows, beginning of period$1,719,329 $691,886 
Cash and cash equivalents, end of period$1,002,728 $1,714,783 
Cash held in escrows, end of period79,193 50,006 
Cash and cash equivalents and cash held in escrows, end of period$1,081,921 $1,764,789 
Supplemental disclosures:
Cash paid for interest$358,015 $335,591 
Interest capitalized$36,632 $41,329 
Non-cash investing and financing activities:
Write-off of fully depreciated real estate$(157,794)$(73,584)
Change in real estate included in accounts payable and accrued expenses$(22,104)$(30,924)
Right-of-use assets obtained in exchange for lease liabilities$26,887 $— 
Accrued rental income, net deconsolidated$— $(4,558)
Tenant leasing costs, net deconsolidated$— $(3,462)
Building and other capital improvements, net deconsolidated$— $(111,889)
Tenant improvements, net deconsolidated$— $(12,331)
Investment in unconsolidated joint venture recorded upon deconsolidation$— $347,898 
Distributions declared but not paid$169,739 $171,070 
Conversions of redeemable partnership units to partners’ capital$8,033 $26,682 
Issuance of restricted securities to employees and non-employee directors$44,257 $43,244 

BOSTON PROPERTIES LIMITED PARTNERSHIP
CONSOLIDATED STATEMENTS OF CASH FLOWS
(Unaudited) 
 For the nine months ended September 30,
 2017 2016
 (in thousands)
Cash flows from financing activities:   
Proceeds from mortgage notes payable2,300,000
 —
Repayments of mortgage notes payable(1,313,890) (1,323,284)
Proceeds from unsecured senior notes—
 1,989,790
Borrowings on unsecured line of credit470,000
 —
Repayments of unsecured line of credit(470,000) —
Repayments of mezzanine notes payable(306,000) —
Repayments of outside members’ notes payable(70,424) —
Payments on capital lease obligations(373) —
Payments on real estate financing transaction(1,306) (4,712)
Deposit on mortgage note payable interest rate lock(23,200) —
Return of deposit on mortgage note payable interest rate lock23,200
 —
Deferred financing costs(44,083) (16,101)
Net proceeds from equity transactions241
 (270)
Distributions(394,900) (557,262)
Contributions from noncontrolling interests in property partnerships38,196
 6,737
Distributions to noncontrolling interests in property partnerships(41,605) (38,694)
Net cash provided by financing activities165,856
 56,204
Net increase (decrease) in cash and cash equivalents136,141
 (304,395)
Cash and cash equivalents, beginning of period356,914
 723,718
Cash and cash equivalents, end of period$493,055
 $419,323
Supplemental disclosures:   
Cash paid for interest$477,189
 $327,053
Interest capitalized$43,286
 $28,956
Non-cash investing and financing activities:   
Write-off of fully depreciated real estate$(102,795) $(164,528)
Additions to real estate included in accounts payable and accrued expenses$36,609
 $11,864
Real estate acquired through capital lease$28,962
 $—
Outside members’ notes payable contributed to noncontrolling interests in property partnerships$109,576
 $—
Distributions declared but not paid$130,434
 $113,038
Conversions of redeemable partnership units to partners’ capital$16,812
 $5,881
Issuance of restricted securities to employees$35,711
 $33,711











The accompanying notes are an integral part of these consolidated financial statements.

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BOSTON PROPERTIES, INC. AND BOSTON PROPERTIES LIMITED PARTNERSHIP
NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS
1. Organization
Boston Properties, Inc., a Delaware corporation, is a fully integrated, self-administered and self-managed real estate investment trust (“REIT”). Boston Properties, Inc. is the sole general partner of Boston Properties Limited Partnership, its operating partnership, and at September 30, 20172021 owned an approximate 89.7% (89.5%89.9% (90.0% at December 31, 2016)2020) general and limited partnership interest in Boston Properties Limited Partnership. Unless stated otherwise or the context requires, the “Company” refers to Boston Properties, Inc. and its subsidiaries, including Boston Properties Limited Partnership and its consolidated subsidiaries. Partnership interests in Boston Properties Limited Partnership include:
•common units of partnership interest (also referred to as “OP Units”),
•long term incentive units of partnership interest (also referred to as “LTIP Units”), and
•preferred units of partnership interest (also referred to as “Preferred Units”).
Unless specifically noted otherwise, all references to OP Units exclude units held by Boston Properties, Inc. A holder of an OP Unit may present such OP Unit to Boston Properties Limited Partnership for redemption at any time (subject to restrictions agreed upon at the time of issuance of OP Units to particular holders that may restrict such redemption right for a period of time, generally one1 year from issuance). Upon presentation of an OP Unit for redemption, Boston Properties Limited Partnership is obligated to redeem suchthe OP Unit for cash equal to the value of a share of common stock of Boston Properties, Inc. (“Common Stock”) at such time.. In lieu of a cash redemption, Boston Properties, Inc. may elect to acquire suchthe OP Unit for one1 share of Common Stock. Because the number of shares of Common Stock outstanding at all times equals the number of OP Units that Boston Properties, Inc. owns, one1 share of Common Stock is generally the economic equivalent of one1 OP Unit, and the quarterly distribution that may be paid to the holder of an OP Unit equals the quarterly dividend that may be paid to the holder of a share of Common Stock.
The Company uses LTIP Units as a form of equity-based awardtime-based, restricted equity compensation and as a form of performance-based equity compensation for annual long-term incentive equity compensation. The Companyemployees, and has also issuedpreviously granted LTIP Units to employees in the form of (1) 2012 outperformance plan awards (“2012 OPP Units”) and (2) 2013 2014, 2015, 2016 and 2017- 2021 multi-year, long-term incentive program awards (also referred to as “MYLTIP Units”), each of which, upon the satisfaction of certain performance and vesting conditions, is convertible into one OP Unit. The three-year measurement periods for the 2012 OPP Units and the 2013 - 2018 MYLTIP Units and 2014 MYLTIP Units expired on February 6, 2015, February 4, 2016 and February 3, 2017, respectively,have ended and Boston Properties, Inc.’s total stockholder return (“TSR”) was sufficient for employees to earn and therefore become eligible to vest in a portion of the awards. Unless and until they are earned, the rights, preferences and privileges of the 2015, 2016 and 20172019 - 2021 MYLTIP Units differ from other LTIP Units granted to employees (including the 2012 OPP Units and the 2013 MYLTIP Units and the 2014- 2018 MYLTIP Units, which have been earned). Therefore, unless specifically noted otherwise, all references to LTIP Units exclude the 2015, 2016 and 20172019 - 2021 MYLTIP Units. LTIP Units (including the earned 2012 OPP Units the 2013 MYLTIP Units and the 2014earned 2013 - 2018 MYLTIP Units), whether vested or not, will receive the same quarterly per unit distributions as OP Units, which equal per share dividends on Common Stock (See Notes 8, 910 and 11)14).
At September 30, 2017,December 31, 2020, there was one1 series of Preferred Units outstanding (i.e., Series B Preferred Units). The Series B Preferred Units were issued to Boston Properties, Inc. on March 27, 2013 in connection with the issuance of 80,000 shares (8,000,000 depositary shares each representing 1/100th of a share) of 5.25% Series B Cumulative Redeemable Preferred Stock (the “Series B Preferred Stock”). Boston Properties, Inc. contributed the net proceeds from the offering to Boston Properties Limited Partnership in exchange for 80,000 Series B Preferred Units having terms and preferences generally mirroring those of the Series B Preferred Stock. On March 2, 2021, Boston Properties, Inc. issued a redemption notice for 80,000 shares of Series B Preferred Stock, which constituted all of the outstanding Series B Preferred Stock, and the corresponding depositary shares, each representing 1/100th of a share of Series B Preferred Stock (the “Depositary Shares”), and recorded it as a liability. On March 31, 2021, Boston Properties, Inc. transferred the full redemption price for all outstanding shares of Series B Preferred Stock of approximately $201.3 million, including approximately $1.3 million of accrued and unpaid dividends to, but not including, the redemption date, to the redemption agent. On April 1, 2021, Boston Properties, Inc. redeemed 80,000 shares of Series B Preferred Stock (including the corresponding 8,000,000 Depositary Shares), which represented all of the outstanding shares of Series B Preferred Stock and all of the outstanding Depositary Shares. In connection with the redemption of the Series B Preferred Stock, the Series B Preferred Units were also redeemed (See Note 9)11).
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Properties
At September 30, 2017,2021, the Company owned or had joint venture interests in a portfolio of 177202 commercial real estate properties (the “Properties”) aggregating approximately 49.852.5 million net rentable square feet of primarily Class A office properties, including ten9 properties under construction/redevelopment totaling approximately 5.74.3 million net rentable square feet. At September 30, 2017,2021, the Properties consisted of:

166 Office•183 office properties (including seven9 properties under construction/redevelopment);
one hotel;
five•12 retail properties;
•6 residential properties; and
five residential properties (including three properties under construction).

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•1 hotel.
The Company considers Class A office properties to be well-located buildings that are professionally managed and maintained, attract high-quality tenants and command upper-tier rental rates, and that are modern structures or have been modernized to compete with newer buildings.buildings and professionally managed and maintained. As such, these properties attract high-quality tenants and command upper-tier rental rates.
2. Basis of Presentation and Summary of Significant Accounting Policies
Boston Properties, Inc. does not have any other significant assets, liabilities or operations, other than its investment in Boston Properties Limited Partnership, nor does it have employees of its own. Boston Properties Limited Partnership, not Boston Properties, Inc., generally executes all significant business relationships other than transactions involving securities of Boston Properties, Inc. All majority-owned subsidiaries and joint ventures over which the Company has financial and operating control and variable interest entities (“VIEs”) in which the Company has determined it is the primary beneficiary are included in the consolidated financial statements. All significant intercompany balances and transactions have been eliminated in consolidation. The Company accounts for all other unconsolidated joint ventures using the equity method of accounting. Accordingly, the Company’s share of the earnings of these joint ventures and companies is included in consolidated net income.
The accompanying interim financial statements are unaudited; however, the financial statements have been prepared in accordance with generally accepted accounting principles (“GAAP”) for interim financial information and in conjunction with the rules and regulations of the Securities and Exchange Commission. Accordingly, they do not include all of the disclosures required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting solely of normal recurring matters) necessary for a fair statement of the financial statements for these interim periods have been included. The results of operations for the interim periods are not necessarily indicative of the results to be obtained for other interim periods or for the full fiscal year. The year-end consolidated balance sheet data was derived from audited financial statements, but does not include all disclosure required by GAAP.  These financial statements should be read in conjunction with the Company’s financial statements and notes thereto contained in the Company’s Annual Report in the Company’s Form 10-K for its fiscal year ended December 31, 2016.
Fair Value of Financial Instruments2020.
The Company determines the fair value of its unsecured senior notes using market prices. The inputs used in determining the fair value of the Company’s unsecured senior notes are categorized at a level 1 basis (as defined in the accounting standards for Fair Value Measurements and Disclosures) due to the fact that the Company uses quoted market rates to value these instruments. However, the inputs used in determining the fair value could be categorized at a level 2 basis (as defined in the accounting standards for Fair Value Measurements and Disclosures) if trading volumes are low. The Company determines the fair value of its mortgage notes payable using discounted cash flow analysis by discounting the spread between the future contractual interest payments and hypothetical future interest payments on mortgage debt based on current market rates for similar securities. In determining the current market rates, the Company addsbases its estimates of market spreads to the quoted yields on federal government treasury securities with similar maturity dates to its debt. The inputs used in determining the fair value of the Company’s mortgage notes payablehistorical experience and mezzanine notes payable are categorized at a level 3 basis (as defined in the accounting standards for Fair Value Measurements and Disclosures) due to the facton various other assumptions that the Companyit considers the rates used in the valuation techniques to be unobservable inputs. To the extent that there are outstanding borrowingsreasonable under the unsecured line of credit, the Company utilizes a discounted cash flow methodology in order to estimate the fair value. To the extent that credit spreads have changed since the origination, the net present value of the difference between future contractual interest payments and future interest payments based on the Company’s estimate of a current market rate would represent the difference between the book value and the fair value. The Company’s estimate of a current market rate is based upon the rate, considering current market conditions and the Company’s specific credit profile, at which it estimates it could obtain similar borrowings. To the extent there are outstanding borrowings, this current market rate is internally estimated and therefore would be primarily based upon a level 3 input.
Because the Company’s valuations of its financial instruments are based on these types of estimates, the actual fair values of its financial instruments may differ materially if the Company’s estimates do not prove to be accurate, and the Company’s estimated fair values for these instruments as of the end of the applicable reporting period are not necessarily indicative of estimated or actual fair values in future reporting periods. The following table presents the aggregate carrying value of the Company’s mortgage notes payable, net, mezzanine notes payable and unsecured senior notes, net and the Company’s corresponding estimate of fair value as of September 30, 2017 and December 31, 2016 (in thousands):

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 September 30, 2017 December 31, 2016
 
Carrying
Amount
   
Estimated
Fair Value
 
Carrying
Amount
   
Estimated
Fair Value
Mortgage notes payable, net$2,982,067
    $3,049,617
 $2,063,087
    $2,092,237
Mezzanine notes payable—
   —
 307,093
   308,344
Unsecured senior notes, net7,252,567
    7,533,164
 7,245,953
    7,428,077
Total$10,234,634
    $10,582,781
 $9,616,133
    $9,828,658
The Company uses interest rate swap agreements to manage its interest rate risk. The valuation of these instruments is determined using widely accepted valuation techniques,circumstances, including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves. To comply with the provisions of Accounting Standards Codification (“ASC”) 820, the Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. The Company has assessed the significance of the impact of extraordinary events such as the credit valuation adjustments oncoronavirus (“COVID-19”) pandemic, the overall valuationresults of its derivative positionswhich form the basis for making significant judgments about the carrying values of assets and has determined that the credit valuation adjustments are not significant to the overall valuationliabilities, assessments of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are classified in Level 2future collectability, and other areas of the fair value hierarchy.financial statements that are impacted by the use of estimates. Actual results may differ from these estimates under different assumptions or conditions.
Variable Interest Entities (VIEs)
Consolidated VIEs are those wherefor which the Company is considered to be the primary beneficiary of a VIE. The primary beneficiary is the entity that has a controlling financial interest in the VIE, which is defined by the entity having both of the following characteristics: (1) the power to direct the activities that, when taken together, most significantly impact the VIE’s performance and (2) the obligation to absorb losses or the right to receive the returns from the VIE that could potentially be significant to the VIE. The Company has determined that it is the primary beneficiary for seven6 of the nine7 entities that are VIEs.
Consolidated Variable Interest Entities
As of September 30, 2017,2021, Boston Properties, Inc. has identified seven6 consolidated VIEs, including Boston Properties Limited Partnership. TheExcluding Boston Properties Limited Partnership, the VIEs own (1)consisted of the following five5 in-service properties: 767 Fifth Avenue (the General Motors Building), Times Square Tower, 601 Lexington Avenue, Atlantic Wharf Office Building and 100 Federal Street and (2) Salesforce Tower, which is currently under development.Street.
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The Company consolidates these VIEs because it is the primary beneficiary.  The third parties’ interests in these consolidated entities with the exception of(excluding Boston Properties Limited Partnership,Partnership’s interest) are reflected as noncontrolling interestinterests in property partnerships in the accompanying Consolidated Financial Statementsconsolidated financial statements (See Note 8)10). 
In addition, Boston Properties, Inc.’s only significant asset is its investment in Boston Properties Limited Partnership and, consequently, substantially all of Boston Properties, Inc.’s assets and liabilities are the assets and liabilities of Boston Properties Limited Partnership. All of Boston Properties, Inc.’s debt is an obligation of Boston Properties Limited Partnership.
Variable Interest Entities Not Consolidated
The Company has determined that its BNY Towerthe Platform 16 Holdings LLCLP joint venture which owns Dock 72 at the Brooklyn Navy Yard, and its 7750 Wisconsin Avenue LLC joint venture, which owns 7750 Wisconsin Avenue, are VIEs.is a VIE. The Company does not consolidate these entities becausethis entity as the Company does not have the power to direct the activities that, when taken together, most significantly impact eachthe VIE’s performance and, therefore, the Company is not considered to be the primary beneficiary.
RecentFair Value of Financial Instruments
The Company follows the authoritative guidance for fair value measurements when valuing its financial instruments for disclosure purposes. The table below presents the financial instruments that are being valued for disclosure purposes as well as the Level at which they are categorized (as defined in Accounting PronouncementsStandards Codification (“ASC”) 820 “Fair Value Measurements and Disclosures” (“ASC 820”)).
In May 2014,
Financial InstrumentLevel
Unsecured senior notes (1)Level 1
Related party note receivableLevel 3
Notes receivableLevel 3
Mortgage notes payableLevel 3
Unsecured line of credit (2)Level 3
_______________
(1)If trading value for the Financial Standards Accounting Board (“FASB”) issued ASU 2014-09, “Revenueperiod is low, the valuation could be categorized as Level 2.
(2)As of September 30, 2021, there were no amounts outstanding under the unsecured line of credit.
Because the Company’s valuations of its financial instruments are based on the above Levels and involve the use of estimates, the actual fair values of its financial instruments may differ materially from Contracts with Customers (Topic 606)” (“ASU 2014-09”). those estimates.
The objectivefollowing table identifies the range and weighted average of ASU 2014-09 is to establish a single comprehensive modelsignificant unobservable inputs for entities to use in accountingthe Company’s Level 3 fair value measured instruments.
Financial InstrumentLevelRangeWeighted Average
Related party note receivableLevel 33.58%3.58%
Notes receivableLevel 33.54% - 8.00%5.78%
Mortgage notes payableLevel 32.50% - 4.75%2.96%
The Company’s estimated fair values for revenue arising from contracts with customers and will supersede mostthese instruments as of the existing revenue recognition guidance, including industry-specific guidance. end of the applicable reporting period are not projections of, nor necessarily indicative of, estimated or actual fair values in future reporting periods.
The core principle is that an entity should recognize revenue to depictfollowing table presents the transferaggregate carrying value of promised goods or services to customers in an amount that reflects the consideration to whichCompany’s related party note receivable, net, notes receivable, net, mortgage notes payable, net, unsecured senior notes, net, unsecured line of credit and unsecured term loan, net and the entity

Company’s corresponding estimate of fair value as of September 30, 2021 and December 31, 2020 (in thousands):
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 September 30, 2021December 31, 2020
 Carrying
Amount		Estimated
Fair Value		Carrying
Amount		Estimated
Fair Value
Related party note receivable, net$78,144 $83,354 $77,552 $84,579 
Notes receivable, net19,297 19,885 18,729 19,372 
Total$97,441 $103,239 $96,281 $103,951 
Mortgage notes payable, net$2,898,699 $3,032,122 $2,909,081 $3,144,150 
Unsecured senior notes, net10,479,651 11,157,602 9,639,287 10,620,527 
Unsecured line of credit— — — — 
Unsecured term loan, net— — 499,390 500,326 
Total$13,378,350 $14,189,724 $13,047,758 $14,265,003 
expects to be entitled in exchange for those goods or services. In applying ASU 2014-09, companies will perform a five-step analysis of transactions to determine when and how revenue is recognized. ASU 2014-09 applies to all contracts with customers except those that are within the scope of other topics in the FASB’s ASC. In August 2015, the FASBissued ASU 2015-14, “Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date” (“ASU 2015-14”), which delayed the effective date of ASU 2014-09 by one year making it effective for the first interim period within annual reporting periods beginning after December 15, 2017. Early adoption is permitted as of the original effective date. In May 2016, the FASB issued ASU No. 2016-12, “Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients” (“ASU 2016-12”). ASU 2016-12 is intended to clarify and provide practical expedients for certain aspects of ASU 2014-09, which outlines a single comprehensive model for entities to use in accounting for revenues arising from contracts with customers and notes that lease contracts with customers are a scope exception. ASU 2014-09 is effective for the Company for reporting periods beginning after December 15, 2017. The Company will adopt ASU 2014-09 effective January 1, 2018 using the modified retrospective approach. The Company’s project team has completed the compilation of the inventory of the sources of revenue that will be impacted by the adoption of ASU 2014-09. The Company expects that executory costs and certain non-lease components of revenue from leases (upon the adoption of ASU 2016-02), certain of its development and management services revenue and gains on sales of real estate may be impacted by the adoption of ASU 2014-09, although the Company anticipates that the impact will be to the pattern of revenue recognition and not the total revenue recognized over time. The Company is progressing with its analysis and evaluation of the impact that the adoption of ASU 2014-09 will have on the recognition pattern of each of its sources of revenue and is nearing completion of its assessment of the overall impact of adopting ASU 2014-09. The Company does not expect that the adoption of ASU 2014-09 will have a material impact on its consolidated financial statements.
In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)” (“ASU 2016-02”), which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e., lessees and lessors). ASU 2016-02 requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase of the leased asset by the lessee. This classification will determine whether the lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less will be accounted for similar to existing guidance for operating leases today. The new standard requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases and operating leases. ASU 2016-02 supersedes previous leasing standards. ASU 2016-02 is effective for the Company for reporting periods beginning after December 15, 2018, with early adoption permitted. The Company will adopt ASU 2016-02 effective January 1, 2019 using the modified retrospective approach. The Company is in the process of evaluating whether it will elect to apply the practical expedients. The Company is in the process of adopting ASU 2016-02, with its project team compiling an inventory of its leases that will be impacted by the adoption of ASU 2016-02. The Company continues to assess the impact of adopting ASU 2016-02. However, the Company will account for operating leases under which it is the lessor on its balance sheet in a manner similar to its current accounting with the underlying leased asset recognized as real estate. The Company expects that executory costs and certain other non-lease components will need to be accounted for separately from the lease component of the lease with the lease component continuing to be recognized on a straight-line basis over the lease term and the executory costs and certain other non-lease components being accounted for under the new revenue recognition guidance in ASU 2014-09. For leases in which the Company is the lessee, primarily consisting of ground leases, the Company will recognize a right-of-use asset and a lease liability equal to the present value of the minimum lease payments with rental payments being applied to the lease liability and to interest expense and the right-of-use asset being amortized to expense over the term of the lease. In addition, under ASU 2016-02, lessors will only capitalize incremental direct leasing costs. As a result, the Company will no longer be able to capitalize legal costs and internal leasing wages and instead will be required to expense these and other non-incremental costs as incurred.
In March 2016, the FASB issued ASU 2016-09, “Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting” (“ASU 2016-09”). ASU 2016-09 is intended to improve the accounting for share-based payments and affects all organizations that issue share-based payment awards to their employees. Several aspects of the accounting for share-based payment awards are simplified with ASU 2016-09, including income tax consequences, classification of awards as equity or liabilities and classification on the statement of cash flows. ASU 2016-09 is effective for the Company for reporting periods beginning after December 15, 2016, with early adoption permitted. On January 1, 2017, the Company adopted ASU 2016-09 and elected to make an accounting policy change to its method of accounting for forfeitures on its awards of stock-based compensation including the issuance of shares of restricted common stock, LTIP Units and MYLTIP Units. The Company now accounts for forfeitures as they occur instead of estimating the number of forfeitures upon the issuance of such awards of stock-based compensation. The adoption resulted in the Company recognizing cumulative effect of a change in accounting principle adjustments to its consolidated balance sheets totaling approximately $0.3 million to Dividends in Excess of Earnings and Partners’ Capital for Boston Properties, Inc. and Boston Properties Limited Partnership,

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respectively, and approximately $1.8 million to noncontrolling interests - common units of Boston Properties Limited Partnership and noncontrolling interests - redeemable partnership units for Boston Properties, Inc. and Boston Properties Limited Partnership, respectively.
In January 2017, the FASB issued ASU 2017-01, “Business Combinations (Topic 805): Clarifying the Definition of a Business” (“ASU 2017-01”). ASU 2017-01 clarifies the framework for determining whether an integrated set of assets and activities meets the definition of a business. The revised framework establishes a screen for determining whether an integrated set of assets and activities is a business and narrows the definition of a business, which is expected to result in fewer transactions being accounted for as business combinations. Acquisitions of integrated sets of assets and activities that do not meet the definition of a business are accounted for as asset acquisitions. This update is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2017, with early adoption permitted for transactions that have not been reported in previously issued (or available to be issued) financial statements and shall be applied on a prospective basis. The Company early adopted ASU 2017-01 during the first quarter of 2017. The Company expects that acquisitions of real estate or in-substance real estate will not meet the revised definition of a business because substantially all of the fair value is concentrated in a single identifiable asset or group of similar identifiable assets (i.e. land, buildings, and related intangible assets) or because the acquisition does not include a substantive process in the form of an acquired workforce or an acquired contract that cannot be replaced without significant cost, effort or delay.
In February 2017, the FASB issued ASU No. 2017-05, “Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets” (“ASU 2017-05”). ASU 2017-05 updates the definition of an “in substance nonfinancial asset” and clarifies the derecognition guidance for nonfinancial assets to conform with the new revenue recognition standard. The effective date and transition methods of ASU 2017-05 are aligned with ASU 2014-09 described above and are effective for the first interim period within annual reporting periods beginning after December 15, 2017. The Company is currently assessing the potential impact that the adoption of ASU 2017-05 will have on its consolidated financial statements.
In May 2017, the FASB issued ASU 2017-09, “Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting” (“ASU 2017-09”). ASU 2017-09 is intended to provide clarity and reduce (1) diversity in practice, (2) cost and (3) complexity when applying the guidance in Topic 718 to a change to the terms or conditions of a share-based payment award. ASU 2017-09 is effective for public entities for fiscal years and interim periods beginning after December 15, 2017. The Company is currently assessing the potential impact that the adoption of ASU 2017-09 will have on its consolidated financial statements.
In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities” (“ASU 2017-12”). ASU 2017-12 was issued with the objective of improving the financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements. ASU 2017-12 also makes certain targeted improvements to simplify the application of the hedge accounting guidance. ASU 2017-12 is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently assessing the potential impact that the adoption of ASU 2017-12 will have on its consolidated financial statements.
3. Real Estate
Boston Properties, Inc.
Real estate consisted of the following at September 30, 20172021 and December 31, 20162020 (in thousands):
September 30, 2017 December 31, 2016September 30, 2021December 31, 2020
Land$4,880,331
 $4,879,020
Land$5,065,704 $5,069,206 
Land held for future development (1)212,585
 246,656
Right of use assets - finance leasesRight of use assets - finance leases237,845 237,393 
Right of use assets - operating leases (1)Right of use assets - operating leases (1)170,085 146,406 
Land held for future development (2)Land held for future development (2)568,034 450,954 
Buildings and improvements12,155,126
 11,890,626
Buildings and improvements14,118,587 13,777,691 
Tenant improvements2,186,953
 2,060,315
Tenant improvements2,853,531 2,752,880 
Furniture, fixtures and equipment37,612
 32,687
Furniture, fixtures and equipment51,013 49,606 
Construction in progress1,386,638
 1,037,959
Construction in progress1,054,531 868,773 
Total20,859,245
 20,147,263
Total24,119,330 23,352,909 
Less: Accumulated depreciation(4,484,798) (4,222,235)Less: Accumulated depreciation(5,850,397)(5,534,102)
$16,374,447
 $15,925,028
$18,268,933 $17,818,807 
_______________
(1)Includes pre-development costs.

(1)See Note 4.
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(2)Includes pre-development costs.
Boston Properties Limited Partnership
Real estate consisted of the following at September 30, 20172021 and December 31, 20162020 (in thousands):
 September 30, 2017 December 31, 2016
Land$4,775,955
 $4,774,460
Land held for future development (1)212,585
 246,656
Buildings and improvements11,848,024
 11,581,795
Tenant improvements2,186,953
 2,060,315
Furniture, fixtures and equipment37,612
 32,687
Construction in progress1,386,638
 1,037,959
Total20,447,767
 19,733,872
Less: Accumulated depreciation(4,394,077) (4,136,364)
 $16,053,690
 $15,597,508
_______________
(1)Includes pre-development costs.
Development
September 30, 2021December 31, 2020
Land$4,968,851 $4,971,990 
Right of use assets - finance leases237,845 237,393 
Right of use assets - operating leases (1)170,085 146,406 
Land held for future development (2)568,034 450,954 
Buildings and improvements13,839,945 13,498,098 
Tenant improvements2,853,531 2,752,880 
Furniture, fixtures and equipment51,013 49,606 
Construction in progress1,054,531 868,773 
Total23,743,835 22,976,100 
Less: Accumulated depreciation(5,739,625)(5,428,576)
$18,004,210 $17,547,524 
_______________
(1)See Note 4.
(2)Includes pre-development costs.
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Acquisitions
On April 6, 2017,June 2, 2021, the Company commenced the development of 145 Broadway, a build-to-suit Class A office project with approximately 485,000 net rentable square feet located in Cambridge, Massachusetts.
On May 27, 2017, the Company completed and fully placed in-service Reservoir Place North, a Class A office redevelopment project with approximately 73,000 net rentable square feetacquired 153 & 211 Second Avenue located in Waltham, Massachusetts.
On August 24, 2017, the Company entered into a 15-year lease with the General Services Administration under which the Company will develop the new headquartersMassachusetts for the Transportation Security Administration (TSA). The TSA will occupy 100% of the approximately 623,000 net rentable square feet of Class A office space and a parking garage at 6595 Springfield Center Drive located in Springfield, Virginia. Concurrently with the execution of the lease, the Company commenced development of the project and expects the building to be available for occupancy by the fourth quarter of 2020.
On September 16, 2017, the Company completed and fully placed in-service 888 Boylston Street, a Class A office and retail project with approximately 417,000 net rentable square feet located in Boston, Massachusetts.
Ground Lease
On June 29, 2017, the Company executed a 99-year ground lease (including extension options), with the right to purchase prior to 10 years after stabilization of the development project as defined in the lease, land adjacent to the MacArthur BART station located in Oakland, California. The Company has commenced development of a 402-unit residential building and supporting retail space on the site. The Company’s option to purchase the land, is considered a bargain purchase option and as a result, the Company has concluded that the lease should be accounted for as a capital lease. At the inception of the ground lease, the Company recorded an approximately $29.0 million capital lease asset and liability, which is reflected within Construction in Progress and Other Liabilities on the Company’s Consolidated Balance Sheets. Capital lease assets and liabilities are accounted for at the lower of fair market value or the present value of future minimum lease payments. This capital lease is for land only, therefore, the Company will not be depreciating the capital lease asset, because land is assumed to have an indefinite life.

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As of June 29, 2017, future minimum lease payments related to this capital lease are as follows (in thousands):
Period from June 29, 2017 through December 31, 2017$5
201810
201910
202010
202113
Thereafter38,778
Total expected minimum obligations38,826
Interest portion(9,864)
Present value of net expected minimum payments$28,962
Acquisitions
On May 15, 2017, the Company acquired 103 Carnegie Center located in Princeton, New Jersey for aaggregate purchase price of approximately $15.8$100.2 million in cash. 103 Carnegie Center is an153 & 211 Second Avenue consists of 2 life sciences lab buildings totaling approximately 96,000137,000 net rentable square foot Class A office property.feet. The properties are 100% leased. The following table summarizes the allocation of the aggregate purchase price, including transaction costs, of 103 Carnegie Center153 & 211 Second Avenue at the date of acquisition (in thousands). :
Land$2,890
Building and improvements11,229
Tenant improvements871
In-place lease intangibles2,389
Below-market lease intangible(1,426)
Net assets acquired$15,953
Land$33,233 
Building and improvements53,309 
Tenant improvements2,631 
In-place lease intangibles13,415 
Below-market lease intangibles(2,412)
Net assets acquired$100,176 
The following table summarizes the estimated annual amortization of the acquired in-place lease intangibles
and the acquired below-market lease intangibles and the acquired in-place lease intangibles for 103 Carnegie Center153 & 211 Second Avenue for the remainder of 2017 and each of2021 through the next four succeeding fiscal yearslast lease expiration (in thousands).:

 
Acquired In-Place
Lease Intangibles  
 
Acquired Below-
Market Lease Intangibles  
Period from May 15, 2017 through December 31, 2017$660
 $(248)
2018590
 (363)
2019367
 (337)
2020243
 (308)
202196
 (105)
Acquired In-Place Lease IntangiblesAcquired Below-Market Lease Intangibles
Period from June 2, 2021 through December 31, 2021$5,202 $935 
20228,213 1,477 

103 Carnegie Center153 & 211 Second Avenue contributed approximately $1.1$3.1 million of revenue and approximately ($0.1 million)1.2) million of earnings to the Company for the period from May 15, 2017June 2, 2021 through September 30, 2017.2021.
DispositionsOn August 2, 2021, the Company acquired Shady Grove Bio+Tech Campus in Rockville, Maryland, for a purchase price, including transaction costs, of approximately $118.5 million in cash. Shady Grove Bio+Tech Campus is an approximately 435,000 net rentable square foot, 7-building office park situated on an approximately 31-acre site. The Company intends to reposition three of the buildings, which are currently vacant, to support lab or life sciences uses. As a result, the three vacant buildings are not part of the Company’s in-service portfolio. The Company anticipates that it will redevelop or convert the remaining four buildings to lab or life sciences-related uses as each becomes vacant. The following table summarizes the allocation of the purchase price, including transaction costs, of Shady Grove Bio+Tech Campus at the date of acquisition (in thousands):
Land$52,030 
Building and improvements63,060 
Tenant improvements1,152 
In-place lease intangibles2,523 
Above-market lease intangibles142 
Below-market lease intangibles(403)
Net assets acquired$118,504 
The following table summarizes the estimated annual amortization of the acquired in-place lease intangibles
and the acquired above/below-market lease intangibles for Shady Grove Bio+Tech Campus from August 2, 2021 through the last lease expiration (in thousands):

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Acquired In-Place Lease IntangiblesAcquired Above-Market Lease IntangiblesAcquired Below-Market Lease Intangibles
Period from August 2, 2021 through December 31, 2021$838 $31 $102 
20221,478 74 236 
2023151 25 39 
202456 12 26 
Shady Grove Bio+Tech Campus contributed approximately $0.5 million of revenue and approximately $(0.6) million of earnings to the Company for the period from August 2, 2021 through September 30, 2021.
Pending Acquisitions
On April 19, 2017,2021, the Company entered into an agreement to acquire 11251 Roger Bacon Drive, in Reston, Virginia, for an aggregate purchase price of approximately $5.6 million. The closing is scheduled to occur in the first quarter of 2022. 11251 Roger Bacon Drive is an approximately 65,000 square foot office building situated on approximately 2.6 acres. The property is 100% leased to a single tenant with a lease that expires concurrently with the planned closing. There can be no assurance that this transaction will be consummated on the terms currently contemplated or at all.
On June 25, 2021, the Company entered into an agreement to acquire 360 Park Avenue South in New York City, New York for an aggregate purchase price of approximately $300.0 million, including (1) the assumption of the mortgage loan collateralized by the property totaling approximately $202.0 million and (2) the issuance of approximately $98.0 million of OP Units, with a floor price of $111.00 per OP Unit. The closing is scheduled to occur in the fourth quarter of 2021. The Company’s deposit of $30.0 million is reflected as Cash Held in Escrows in the Company’s Consolidated Balance Sheets. 360 Park Avenue South is an approximately 450,000 square foot Class A office building. Upon acquisition, the building will be vacant and the Company intends to redevelop or reposition the building. There can be no assurance that the acquisition will be consummated on the terms currently contemplated or at all.
Developments
On February 1, 2021, the consolidated entity in which the Company has a 55% interest completed and fully placed in-service One Five Nine East 53rd Street, a Class A office and retail redevelopment of the low-rise portion of its 601 Lexington Avenue property with approximately 220,000 net rentable square feet located in New York City.
On February 25, 2021, the Company commenced the development of 180 CityPoint, located in Waltham, Massachusetts. When completed, the salebuilding will consist of approximately 329,000 net rentable square feet of laboratory space.
On February 25, 2021, the Company commenced the redevelopment of 880 Winter Street, located in Waltham, Massachusetts. When completed, the building will consist of approximately 224,000 net rentable square feet of laboratory space.
On February 25, 2021, the Company commenced the redevelopment of View Boston Observatory at The Prudential Center, a 59,000 net rentable square foot redevelopment of the top three floors of 800 Boylston Street - The Prudential Center, located in Boston, Massachusetts.
On April 16, 2021, the Company removed 3625-3635 Peterson Way from its in-service portfolio following the lease expiration of the last tenant on April 15, 2021. The Company is demolishing the building and may redevelop the site at a future date. 3625-3635 Peterson Way is an approximately 9.5-acre parcel of land at 30 Shattuck Road218,000 net rentable square foot Class A office building located in Andover, Massachusetts forSanta Clara, California.
Dispositions
On December 13, 2018, the Company sold its 6595 Springfield Center Drive development project located in Springfield, Virginia. Concurrently with the sale, the Company agreed to act as development manager and guaranteed the completion of the project (See Note 9). The development project achieved final completion during the third quarter of 2021 and, upon completion of the project, the total cost of development was determined to be
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below the estimated total investment at the time of sale. As a gross sale price of $5.0 million. Net cash proceeds totaled approximately $5.0 million, resulting inresult, the Company recognized a gain on sale of real estate totalingof approximately $3.7 million.$8.1 million during the nine months ended September 30, 2021.
On JuneJuly 13, 2017,2021, the Company completed the sale of 40 Shattuck Roadentered into an agreement to sell its 181,191 and 201 Spring Street properties located in Andover,Lexington, Massachusetts for aan aggregate gross salesales price of $12.0$191.5 million. Net cash proceeds totaled181,191 and 201 Spring Street are three Class A office properties aggregating approximately $11.9 million, resulting in a gain on sale of real estate totaling approximately $28,000 for Boston Properties, Inc. and approximately $0.6 million for Boston Properties Limited Partnership. 40 Shattuck Road is an approximately 122,000333,000 net rentable square foot Class A office property. 40 Shattuck Road contributed approximately $(28,000) of net lossfeet and are 100% leased (See Note 15).
4. Leases
The Company must make estimates as to the collectability of its accrued rent and accounts receivable balances related to lease revenue. When evaluating the collectability of tenants’ accrued rent and accounts receivable balances, management considers tenant creditworthiness, current economic trends, including the impact of COVID-19 on tenants’ businesses, and changes in tenants’ payment patterns, on a lease-by-lease basis. As a result, during thenine months ended September 30, 2021, the Company wrote off approximately $1.3 million related to accrued rent, net balances and accounts receivable, net balances. There were no write-offs related to accrued rent, net balances and accounts receivable, net balances for the period from January 1, 2017 through June 13, 2017 and contributed approximately $(33,000) and $(18,000) of net loss to the Company forthree months ended September 30, 2021. During the three and nine months ended September 30, 2016,2020, the Company wrote off approximately $7.5 million and $63.8 million, respectively, related to accrued rent, net balances and accounts receivable, net balances. The write-offs were for tenants, primarily in the retail sector, that either terminated their leases or for which the Company determined their accrued rent and/or accounts receivable balances were no longer probable of collection.
Lessee
On May 19, 2021, the Company amended its ground lease at Sumner Square in Washington, DC. The amendment extends the ground lease for an additional 15 years. Prior to the amendment, the ground lease was scheduled to expire on August 10, 2066. The ground lease will now expire on August 9, 2081. The lease requires the Company to pay $23.0 million in 2021 and requires the Company’s remaining obligation of approximately $4.0 million be used to fund certain operation and maintenance costs incurred by the government with respect to the Sumner School for the next five years, with no payments thereafter. The Company’s incremental borrowing rate is 3.95% per annum. The net present value of the total ground lease payments is approximately $26.7 million. The Company continues to classify this ground lease as an operating lease. As a result, the Company recorded a Right-of-Use Assets - Operating Leases and Lease Liabilities - Operating Leases of approximately $27.1 million and $26.7 million, respectively, on its Consolidated Balance Sheet. On July 1, 2021, the Company made the $23.0 million payment. The Sumner Square ground lease had operating lease costs of approximately $0.1 million and $0.3 million for the three months ended September 30, 2021 and 2020, respectively, and approximately $0.6 million and $1.0 million for the nine months ended September 30, 2021 and 2020, respectively. Sumner Square is an approximately 210,000 net rentable square foot Class A office building.

The following table provides a maturity analysis for the Company’s lease liabilities related to its Sumner Square operating lease as of May 19, 2021 (in thousands):
Operating
Period from May 19, 2021 through December 31, 2021$23,599 
2022761 
2023784 
2024808 
2025832 
2026422 
Thereafter— 
Total lease payments27,206 
Less: Interest portion(536)
Present value of lease payments$26,670 
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Lessor
On AugustThe following table summarizes the components of lease revenue recognized during the three and nine months ended September 30, 2017,2021 and 2020 included within the Company completed the saleCompany's Consolidated Statements of its Reston Eastgate property located in Reston, Virginia for a gross sale price of $14.0 million.  Net cash proceeds totaled approximately $13.2 million, resulting in a gain on sale of real estate totaling approximately $2.8 million. Reston Eastgate is a parcel of land containing approximately 21.7 acres located at 11011 Sunset Hills Road.Operations (in thousands):
Three months ended September 30,Nine months ended September 30,
Lease Revenue2021202020212020
Fixed contractual payments$581,393 $557,384 $1,732,930 $1,673,855 
Variable lease payments110,867 109,290 329,172 333,049 
$692,260 $666,674 $2,062,102 $2,006,904 
4.
5. Investments in Unconsolidated Joint Ventures
The investments in unconsolidated joint ventures consist of the following at September 30, 20172021 and December 31, 2016:2020:
 
Nominal %
Ownership
 Carrying Value of Investment (1) Carrying Value of Investment (1)
Entity Properties  September 30, 2017 December 31, 2016EntityPropertiesNominal % OwnershipSeptember 30,
2021		December 31,
2020
   (in thousands)(in thousands)
Square 407 Limited Partnership Market Square North 50.0% $(8,474) $(8,134)Square 407 Limited PartnershipMarket Square North50.00 %$(1,917)$(3,766)
The Metropolitan Square Associates LLC Metropolitan Square 20.0% 2,537
 2,004
BP/CRF 901 New York Avenue LLC 901 New York Avenue 25.0%(2) (10,747) (10,564)
BP/CRF Metropolitan Square LLCBP/CRF Metropolitan Square LLCMetropolitan Square20.00 %(14,568)(13,584)
901 New York, LLC901 New York, LLC901 New York Avenue25.00 %(2) (12,390)(12,264)
WP Project Developer LLC Wisconsin Place Land and Infrastructure 33.3%(3) 40,158
 41,605
WP Project Developer LLCWisconsin Place Land and Infrastructure33.33 %(3) 34,104 35,297 
Annapolis Junction NFM, LLC Annapolis Junction 50.0%(4) 18,771
 20,539
Annapolis Junction NFM LLCAnnapolis Junction NFM LLCAnnapolis Junction50.00 %(4) N/A13,463 
540 Madison Venture LLC 540 Madison Avenue 60.0% 67,046
 67,816
540 Madison Venture LLC540 Madison Avenue60.00 %(5) — 122 
500 North Capitol Venture LLC 500 North Capitol Street, NW 30.0% (3,642) (3,389)500 North Capitol Venture LLC500 North Capitol Street, NW30.00 %(7,700)(6,945)
501 K Street LLC 1001 6th Street 50.0%(5) 42,442
 42,528
501 K Street LLC1001 6th Street50.00 %(6) 42,669 42,499 
Podium Developer LLC The Hub on Causeway 50.0% 55,917
 29,869
Podium Developer LLCThe Hub on Causeway - Podium50.00 %48,970 48,818 
Residential Tower Developer LLC The Hub on Causeway - Residential 50.0% 25,811
 20,803
Residential Tower Developer LLCHub50House50.00 %47,934 50,943 
Hotel Tower Developer LLC The Hub on Causeway - Hotel 50.0% 1,596
 933
Hotel Tower Developer LLCThe Hub on Causeway - Hotel Air Rights50.00 %11,402 10,754 
Office Tower Developer LLCOffice Tower Developer LLC100 Causeway Street50.00 %56,714 56,312 
1265 Main Office JV LLC 1265 Main Street 50.0% 4,686
 4,779
1265 Main Office JV LLC1265 Main Street50.00 %3,855 3,787 
BNY Tower Holdings LLC Dock 72 at the Brooklyn Navy Yard 50.0%(6)67,901
 33,699
BNY Tower Holdings LLCDock 7250.00 %28,079 29,536 
BNYTA Amenity Operator LLCBNYTA Amenity Operator LLCDock 7250.00 %1,151 1,846 
CA-Colorado Center Limited Partnership Colorado Center 50.0% 263,834
 510,623
CA-Colorado Center Limited PartnershipColorado Center50.00 %230,535 227,671 
7750 Wisconsin Avenue LLC 7750 Wisconsin Avenue 50.0%(6)21,101
 N/A
7750 Wisconsin Avenue LLC7750 Wisconsin Avenue50.00 %59,734 58,112 
BP-M 3HB Venture LLCBP-M 3HB Venture LLC3 Hudson Boulevard25.00 %116,537 113,774 
SMBP Venture LPSMBP Venture LPSanta Monica Business Park55.00 %155,679 145,761 
Platform 16 Holdings LPPlatform 16 Holdings LPPlatform 1655.00 %(7)108,098 108,393 
Gateway Portfolio Holdings LLCGateway Portfolio Holdings LLCGateway Commons50.00 %(8)328,367 336,206 
Rosecrans-Sepulveda Partners 4, LLCRosecrans-Sepulveda Partners 4, LLCBeach Cities Media Campus50.00 %27,124 27,184 
Safeco Plaza REIT LLCSafeco Plaza REIT LLCSafeco Plaza33.67 %(9)72,570 N/A
   $588,937
 $753,111
$1,336,947 $1,273,919 
 _______________
(1)Investments with deficit balances aggregating approximately $22.9 million and $22.1 million at September 30, 2017 and December 31, 2016, respectively, have been reflected within Other Liabilities in the Company’s Consolidated Balance Sheets.
(2)The Company’s economic ownership has increased based on the achievement of certain return thresholds.
(3)The Company’s wholly-owned entity that owns the office component of the project also owns a 33.3% interest in the entity owning the land, parking garage and infrastructure of the project.
(4)
The joint venture owns four in-service buildings and two undeveloped land parcels.
(1)Investments with deficit balances aggregating approximately $36.6 million at September 30, 2021 and December 31, 2020 are included within Other Liabilities in the Company’s Consolidated Balance Sheets.
(2)The Company’s economic ownership has increased based on the achievement of certain return thresholds. At September 30, 2021 and December 31, 2020, the Company’s economic ownership was approximately 50%.
(3)The Company’s wholly-owned subsidiary that owns Wisconsin Place Office also owns a 33.33% interest in the joint venture entity that owns the land, parking garage and infrastructure of the project.
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(4)On March 30, 2021, the Company sold its interest in the joint venture to the partner. See below for additional details.
(5)The property was sold on June 27, 2019. As of December 31, 2020, the investment consisted of undistributed cash. All remaining cash has been distributed as of September 30, 2021.
(6)Under the joint venture agreement for this land parcel, the partner will be entitled to up to 2 additional payments from the venture based on increases in total entitled square footage of the project above 520,000 square feet and achieving certain project returns at stabilization.
(7)This entity is a VIE (See Note 2).
(8)As a result of the partner’s deferred contribution, the Company owned an approximately 52% and 55% interest in the joint venture at September 30, 2021 and December 31, 2020, respectively.
(9)The Company’s ownership includes (1) a 33.0% direct interest in the joint venture, and (2) an additional 1% interest in each of the two entities (each, a “Safeco Partner Entity”) through which each partner owns its interest in the joint venture.
(5)Under the joint venture agreement for this land parcel, the partner will be entitled to up to two additional payments from the venture based on increases in total entitled square footage of the project above 520,000 square feet and achieving certain project returns at stabilization.
(6)The entity is a VIE (See Note 2).
Certain of the Company’s unconsolidated joint venture agreements include provisions whereby, at certain specified times, each partner has the right to initiate a purchase or sale of its interest in the joint ventures. With limited exception, under these provisions, the Company is not compelled to purchase the interest of its outside joint venture partners. Under certain of the Company’s joint venture agreements, if certain return thresholds are achieved, the partners or the Company will be entitled to an additional promoted interest or payments.

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The combined summarized balance sheets of the Company’s unconsolidated joint ventures are as follows:
September 30,
2021		December 31,
2020
 (in thousands)
ASSETS
Real estate and development in process, net (1)$5,244,585 $4,708,571 
Other assets561,722 531,071 
Total assets$5,806,307 $5,239,642 
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY
Mortgage and notes payable, net$2,995,161 $2,637,911 
Other liabilities (2)639,980 650,433 
Members’/Partners’ equity2,171,166 1,951,298 
Total liabilities and members’/partners’ equity$5,806,307 $5,239,642 
Company’s share of equity$995,995 $936,087 
Basis differentials (3)340,952 337,832 
Carrying value of the Company’s investments in unconsolidated joint ventures (4)$1,336,947 $1,273,919 
_______________
(1)At September 30, 2021 and December 31, 2020, this amount included right of use assets - finance leases totaling approximately $248.9 million, and right of use assets - operating leases totaling approximately $22.6 million and $22.5 million, respectively.
(2)At September 30, 2021 and December 31, 2020, this amount included lease liabilities - finance leases totaling approximately $386.3 million and $388.7 million, respectively, and lease liabilities - operating leases totaling approximately $30.4 million and $29.0 million, respectively.
(3)This amount represents the aggregate difference between the Company’s historical cost basis and the basis reflected at the joint venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials result from impairments of investments, acquisitions through joint ventures with no change in control and upon the transfer of assets that were previously owned by the Company into a joint venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the joint venture level. The majority of the Company’s basis differences are as follows:
September 30,
2021		December 31,
2020
Property(in thousands)
Colorado Center$305,236 $307,328 
Gateway Commons51,566 51,875 
Dock 72(50,599)(52,243)
These basis differentials (excluding land) will be amortized over the remaining lives of the related assets and liabilities.
(4)Investments with deficit balances aggregating approximately $36.6 million at September 30, 2021 and December 31, 2020 are reflected within Other Liabilities in the Company’s Consolidated Balance Sheets.
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 September 30, 2017 December 31, 2016
 (in thousands)
ASSETS   
Real estate and development in process, net$1,716,447
 $1,519,217
Other assets374,484
 297,263
Total assets$2,090,931
 $1,816,480
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY   
Mortgage and notes payable, net$1,411,401
 $865,665
Other liabilities86,971
 67,167
Members’/Partners’ equity592,559
 883,648
Total liabilities and members’/partners’ equity$2,090,931
 $1,816,480
Company’s share of equity$291,029
 $450,662
Basis differentials (1)297,908
 302,449
Carrying value of the Company’s investments in unconsolidated joint ventures (2)$588,937
 $753,111
 _______________
(1)This amount represents the aggregate difference between the Company’s historical cost basis and the basis reflected at the joint venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials result from impairments of investments, acquisitions through joint ventures with no change in control and upon the transfer of assets that were previously owned by the Company into a joint venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the joint venture level. At September 30, 2017 and December 31, 2016, there was an aggregate basis differential of approximately $324.4 million and $328.8 million, respectively, between the carrying value of the Company’s investment in the joint venture that owns Colorado Center and the joint venture’s basis in the assets and liabilities, which differential (excluding land) shall be amortized over the remaining lives of the related assets and liabilities.
(2)Investments with deficit balances aggregating approximately $22.9 million and $22.1 million at September 30, 2017 and December 31, 2016, respectively, have been reflected within Other Liabilities in the Company’s Consolidated Balance Sheets.
The combined summarized statements of operations of the Company’s unconsolidated joint ventures are as follows:
 Three months ended September 30,Nine months ended September 30,
 2021202020212020
 (in thousands)
Total revenue (1)$90,009 $87,724 $268,501 $270,490 
Expenses
Operating40,378 37,572 114,299 106,677 
Transaction costs— — 7 — 
Depreciation and amortization36,036 35,810 103,766 105,235 
Total expenses76,414 73,382 218,072 211,912 
Other income (expense)
Interest expense(27,519)(25,481)(78,711)(71,370)
Gains on sales of real estate— — — 11,720 
Net loss$(13,924)$(11,139)$(28,282)$(1,072)
Company’s share of net income (loss)$(4,491)$(4,421)$(10,268)$855 
Gain on sale of investment (2)— — 10,257 — 
Basis differential (3)(1,106)(2,452)(1,734)(6,265)
Loss from unconsolidated joint ventures$(5,597)$(6,873)$(1,745)$(5,410)
 Three months ended September 30, Nine months ended September 30,
 2017 2016 2017 2016
 (in thousands)
Total revenue (1)$55,516
 $49,002
 $166,139
 $125,039
Expenses       
Operating23,128
 21,753
 67,310
 54,779
Depreciation and amortization16,440
 12,038
 44,973
 30,306
Total expenses39,568
 33,791
 112,283
 85,085
Operating income15,948
 15,211
 53,856
 39,954
Other expense       
Interest expense13,088
 8,400
 31,815
 25,172
Net income$2,860
 $6,811
 $22,041
 $14,782
        
Company’s share of net income$2,909
 $3,179
 $11,576
 $6,830
Basis differential (2)(2,066) (1,715) (4,541) (1,341)
Income from unconsolidated joint ventures$843
 $1,464
 $7,035
 $5,489
_______________ 
(1)Includes straight-line rent adjustments of approximately $5.1 million and $5.2 million for the three months ended September 30, 2017 and 2016, respectively, and $16.4 million and $11.0 million for the nine months ended September 30, 2017 and 2016, respectively.

(1)Includes straight-line rent adjustments of approximately $5.5 million and $3.8 million for the three months ended September 30, 2021 and 2020, respectively, and approximately $11.6 million and $22.0 million for the nine months ended September 30, 2021 and 2020, respectively.
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(2)Includes straight-line rent adjustments of approximately $0.7 million and $0.7 million for the three months ended September 30, 2017 and 2016, respectively, and $2.2 million and $0.7 million for the nine months ended September 30, 2017 and 2016, respectively. Also includes net above-/below-market rent adjustments of approximately $0.4 million and $0.5 million for the three months ended September 30, 2017 and 2016, respectively, and $1.3 million and $0.5 million for the nine months ended September 30, 2017 and 2016, respectively.
On July 10, 2017,(2)During the nine months ended September 30, 2021, the Company acquiredcompleted the sale of its 50% ownership interest in Annapolis Junction NFM LLC. The Company recognized a gain on sale of investment of approximately $10.3 million.
(3)Includes straight-line rent adjustments of approximately $0.1 million and $0.4 million for the three months ended September 30, 2021 and 2020, respectively, and approximately $0.7 million and $1.3 million for the nine months ended September 30, 2021 and 2020, respectively. Also includes net above-/below-market rent adjustments of approximately $0.1 million and $0.2 million for the three months ended September 30, 2021 and 2020, respectively, and approximately $0.2 million and $0.7 million for the nine months ended September 30, 2021 and 2020, respectively.
On February 25, 2021, a joint venture in which the Company had a 54% interest, commenced the development of 751 Gateway, a speculative laboratory building located in South San Francisco, California, that is expected to be approximately 229,000 net rentable square feet upon completion. 751 Gateway is the first phase of a multi-phase development plan at Gateway Commons. Upon the formation of the joint venture in 2020, the Company had an additional 0.2%approximately 55% ownership interest in the unconsolidated joint venture that owns Colorado Center located in Santa Monica, California for approximately $2.1 million in cash. Followingas a result of the acquisition,partner’s deferred contribution and the partner is obligated to fund all required capital until such time as the Company owns a 50% interest. On September 30, 2021, the Company had a 52% interest in the joint venture. The Company continuesexpects the 751 Gateway development project to account forbe transferred to a separate joint venture with the same partner. The Company expects it will own a 49% interest in this new joint venture.
On March 30, 2021, the Company completed the sale of its 50% ownership interest in Annapolis Junction NFM LLC (the “Annapolis Junction Joint Venture”) to the joint venture under the equity method partner for a gross sales price of accounting as there were no changes$65.9 million. Net cash proceeds to the rightsCompany totaled approximately $17.8 million after repayment of the members as a resultCompany's share of the acquisition. On July 28, 2017, the unconsolidated joint venture obtained mortgage financing collateralized by the propertydebt totaling $550.0approximately $15.1 million. The mortgage financing bears interest atCompany recognized a fixed rategain on sale of 3.56% per annum and matures on August 9, 2027. The loan requires interest-only payments duringinvestment totaling approximately $10.3 million, which is included in Loss from Unconsolidated Joint Ventures in the 10-year termaccompanying Consolidated Statements of the loan, with the entire principal amount due at maturity. The joint venture distributedOperations. In addition to the partners the net cash proceeds from the financing totaling $502.0sale, the Company received a distribution of approximately $5.8 million of which the Company’s share was $251.0 million. Colorado Center is a six-buildingavailable cash. Annapolis Junction Buildings Six and Seven are Class A office complex that sits on a 15-acre site and contains an aggregate ofproperties totaling approximately 1,118,000247,000 net rentable square feet with an underground parking garage for 3,100 vehicles.
On August 7, 2017,feet. With the Company entered into a joint venture with The Bernstein Companies to develop an approximately 722,000 net rentable square foot (subject to adjustment based on finalized building design) build-to-suit Class A office building and below-grade parking garage at 7750 Wisconsin Avenue in Bethesda, Maryland. The joint venture entered into a lease agreement with an affiliate of Marriott International, Inc. under which Marriott will lease 100%sale of the office building and garage for a term of 20 years, and the building will serve as Marriott’s new worldwide headquarters. Marriott has agreed to fund 100% of the related tenant improvement costs and leasing commissions for the office building. The Company will serve as co-development manager for the venture and expects to commence construction in 2018. The Company and The Bernstein Companies each own a 50%Company’s ownership interest in the joint venture. For its initial contribution, The Bernstein Companies contributed land with an initial fair value of $72.0 million and cash and improvements aggregating approximately $4.9 million. The Company contributed cash and improvements aggregating approximately $20.8 million for its initial contribution, of which $11.0 million was distributed to The Bernstein Companies. In addition,Annapolis Junction Joint Venture, the Company was required to fund $25.0 million into an escrow account to be used by the joint venture to fund future development costs. See also Note 7.no longer has any assets in Annapolis, Maryland.
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On September 6, 2017,June 11, 2021, a joint venture in which the Company has a 50% interest obtainedpartially placed in-service 100 Causeway Street, a Class A office project with approximately 632,000 net rentable square feet located in Boston, Massachusetts.
On August 31, 2021, a joint venture in which the Company has a 50% interest extended the construction financing with a total commitment of $204.6 millionloan collateralized by its The Hub on Causeway development project.– Podium property. At the time of the extension, the outstanding balance of the loan totaled approximately $174.3 million, bore interest at a variable rate equal to LIBOR plus 2.25% per annum and was scheduled to mature on September 6, 2021, with 2, 1-year extension options, subject to certain conditions. The construction financing bearsextended loan continues to bear interest at a variable rate equal to LIBOR plus 2.25% per annum and matures on September 6, 2021, with two, one-year extension options, subject to certain conditions.  As of September 30, 2017, the venture had not drawn any funds under the loan.2023. The Hub on Causeway - Podium is ana retail and office property with approximately 385,000382,000 net rentable square foot project containing retail and office spacefeet located in Boston, Massachusetts. In connection with the construction financing,
On September 1, 2021, the Company obtained the rightentered into a joint venture to complete the constructionacquire Safeco Plaza, a Class A office property located in Seattle, Washington, for a gross purchase price of approximately $465.0 million. Safeco Plaza is a 50-story, approximately 765,000 net rentable square-foot, Class A office property. The acquisition was completed through a newly formed joint venture with 2 institutional partners. Each of the garage underneathinstitutional partners invested approximately $71.9 million of cash for its 33.165% ownership interest in the project being developed by an affiliate ofjoint venture. The Company invested approximately $72.6 million for its 33.67% interest in the joint venture partner and obtain funding fromis providing customary operating, property management and leasing services to the garage construction lender.joint venture. The Company agreed to guaranty completionCompany’s ownership includes (1) a 33.0% direct interest in the joint venture, and (2) an additional 1% interest in each of the garagetwo Safeco Partner Entities through which each partner owns its interest in the joint venture. Subject to the construction lenderoccurrence of certain events and an affiliate of its partner agreed to reimbursethe joint venture achieving certain return thresholds, the Company foris entitled to earn promote distributions. Some of the partner’s share of any payments made under the guaranty.
5. Debt
Mortgage Notes Payable, Net, Mezzanine Notes Payable and Outside Members’ Notes Payable
On June 7, 2017,promote distributions may be payable in cash or, at the Company’s consolidated entityelection, equity interest(s) in which it hasthe Safeco Partner Entity(ies). The purchase price was funded with cash and proceeds from a 60% ownership interest and that owns 767 Fifth Avenue (the General Motors Building) located in New York City completed the refinancing of the indebtedness that had beennew mortgage loan secured by direct and indirect interests in the property. The new mortgage financingloan has a principal amount of $2.3 billion,$250.0 million, bears interest at a fixed interestvariable rate equal to the greater of 3.43%(x) 2.35% or (y) LIBOR plus 2.20% per annum and matures on June 9, 2027. TheSeptember 1, 2026.
6. Mortgage Notes Payable
On March 26, 2021, the Company used available cash to repay the mortgage loan requires monthly interest-only payments during the 10-year term of the loan, with the entire principal amount being due at maturity.
The refinanced indebtedness consisted of (1) mortgage loans payable collateralized by theits University Place property aggregating $1.3 billion, (2) mezzanine loans payable aggregating $306.0 million, (3) additional mezzanine loans payable aggregating $294.0 million and (4) member loans aggregating $450.0 million with outstanding accrued interest payablelocated in Cambridge, Massachusetts totaling approximately $425.0$0.9 million. The mortgage loans required monthly interest-only payments at a weighted-average fixed interest rate of 5.95% per annum and were scheduled to mature on October 7, 2017. The mezzanine loans required interest-only payments at a weighted-average fixed interest rate of 6.02% per annum and were scheduled to mature on October 7, 2017. In addition, a subsidiary of the consolidated entity had acquired a lender’s interest in certain other mezzanine loans assumed during the acquisition of the property having an aggregate principal amount of $294.0 million and a stated interest rate of 6.02% per annum for a purchase price of approximately $263.1 million in cash. These mezzanine loans payable had been eliminated in

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consolidation and were canceled upon the refinancing of the indebtedness. The member loansloan bore interest at a fixed rate of 11.0%6.94% per annum and werewas scheduled to mature on June 9, 2017. A portion of the original purchase price of the property was financed with loans from the members on a pro rata basis equal to their percentage interest in the consolidated entity. The Company had eliminated in consolidation its member loan totaling $270.0 million and its share of the related accrued interest payable of approximately $255.0 million at the date of the refinancing. The remaining outside members’ notes payable and related accrued interest payable totaling $180.0 million and approximately $170.0 million, respectively, at the date of the refinancing had been reflected as Outside Members’ Notes Payable and within Accrued Interest Payable, respectively, on the Company’s Consolidated Balance Sheets. The net proceeds from the new financing were used to repay all of the outstanding accrued interest payable on the member loans and a portion of the outstanding principal balance of the member loans totaling approximately $176.1 million. In connection with the refinancing, the members of the Company’s consolidated entity contributed the remaining balance of the member notes payable totaling approximately $273.9 million (of which the Company’s share of approximately $164.4 million had been eliminated in consolidation) to equity in the consolidated entity (See Note 8).August 1, 2021. There was no prepayment penalty associated withpenalty.
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7. Unsecured Senior Notes
The following summarizes the repayments.unsecured senior notes outstanding as of September 30, 2021 (dollars in thousands):
Coupon/Stated RateEffective Rate(1)Principal AmountMaturity Date(2)
11 Year Unsecured Senior Notes3.850 %3.954 %$1,000,000 February 1, 2023(3)
10.5 Year Unsecured Senior Notes3.125 %3.279 %500,000 September 1, 2023
10.5 Year Unsecured Senior Notes3.800 %3.916 %700,000 February 1, 2024
7 Year Unsecured Senior Notes3.200 %3.350 %850,000 January 15, 2025
10 Year Unsecured Senior Notes3.650 %3.766 %1,000,000 February 1, 2026
10 Year Unsecured Senior Notes2.750 %3.495 %1,000,000 October 1, 2026
10 Year Unsecured Senior Notes4.500 %4.628 %1,000,000 December 1, 2028
10 Year Unsecured Senior Notes3.400 %3.505 %850,000 June 21, 2029
10.5 Year Unsecured Senior Notes2.900 %2.984 %700,000 March 15, 2030
10.75 Year Unsecured Senior Notes3.250 %3.343 %1,250,000 January 30, 2031
11 Year Unsecured Senior Notes2.550 %2.671 %850,000 April 1, 2032
12 Year Unsecured Senior Notes2.450 %2.524 %850,000 October 1, 2033
Total principal10,550,000 
Less:
Net unamortized discount17,581 
Deferred financing costs, net52,768 
Total$10,479,651 
_______________
(1)Yield on issuance date including the effects of discounts on the notes, settlements of interest rate contracts and the amortization of financing costs.
(2)No principal amounts are due prior to maturity.
(3)See Note 15.
On February 14, 2021, Boston Properties Limited Partnership completed the redemption of $850.0 million in aggregate principal amount of its 4.125% senior notes due May 15, 2021. The redemption price was approximately $858.7 million, which was equal to the stated principal plus approximately $8.7 million of accrued and unpaid interest to, but not including, the redemption date. Excluding the accrued and unpaid interest, the redemption price was equal to the principal amount being redeemed. The Company recognized a gainloss from early extinguishment of debt totaling approximately $14.6$0.4 million primarily consisting of the acceleration of the remaining balance related to historical fair value debt adjustments.
Credit Facilityunamortized origination costs.
On April 24, 2017,March 16, 2021, Boston Properties Limited Partnership completed a public offering of $850.0 million in aggregate principal amount of its 2.550% unsecured senior notes due 2032. The notes were priced at 99.570% of the principal amount to yield an effective rate (including financing fees) of approximately 2.671% per annum to maturity. The notes will mature on April 1, 2032, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $839.2 million after deducting underwriting discounts and transaction expenses.
On September 29, 2021, Boston Properties Limited Partnership completed a public offering of $850.0 million in aggregate principal amount of its 2.450% unsecured senior notes due 2033. The notes were priced at 99.959% of the principal amount to yield an effective rate (including financing fees) of approximately 2.524% per annum to maturity. The notes will mature on October 1, 2033, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $842.5 million after deducting underwriting discounts and transaction expenses.
The indenture relating to the unsecured senior notes contains certain financial restrictions and requirements, including (1) a leverage ratio not to exceed 60%, (2) a secured debt leverage ratio not to exceed 50%, (3) an interest coverage ratio of greater than 1.50, and (4) an unencumbered asset value of not less than 150% of unsecured debt. At September 30, 2021, Boston Properties Limited Partnership was in compliance with each of these financial restrictions and requirements.
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8. Unsecured Credit Facility
On March 16, 2021, Boston Properties Limited Partnership repaid $500.0 million, representing all amounts outstanding on its delayed draw term loan facility under its unsecured revolving credit agreement (the “2017 Credit Facility”). The Company recognized a loss from early extinguishment of debt totaling approximately $0.5 million related to unamortized financing costs.
On June 15, 2021, Boston Properties Limited Partnershipamended and restated its revolving credit agreementthe 2017 Credit Facility (as amended and restated, the “2017“2021 Credit Facility”). The 2021 Credit Facility provides for borrowings of up to $1.5 billion (the “Revolving Facility”), subject to customary conditions. Among other things, the 2017 Credit Facilityamendment and restatement (1) increased the total commitment of the revolving line of credit (the “Revolving Facility”) from $1.0 billion to $1.5 billion, (2) extended the maturity date from July 26, 2018 to April 24, 2022,June 15, 2026, (2) eliminated the $500.0 million delayed draw term loan facility provided under the 2017 Credit Facility, (3) reduced the per annum variable interest rates on borrowings and (4) added a $500.0 million delayed draw term loan facility (the “Delayed Draw Facility”) that permits Boston Properties Limited Partnership, untilsustainability-linked pricing component. Under the first anniversary of the closing date, to draw upon up to four times a minimum of $50.0 million (or, if less, the unused delayed draw term commitments), provided that amounts drawn under the Delayed Draw2021 Credit Facility, and subsequently repaid may not be borrowed again. In addition, Boston Properties Limited Partnership may increase the total commitment under the 2017 Credit Facility by up to $500.0 million through increases inby increasing the amount of the Revolving Facility and/or the Delayed Draw Facility,by incurring one or both,more term loans, in each case, subject to syndication of the increase and other conditions.
The 2021 Credit Facility replaces the 2017 Credit Facility, which was scheduled to expire on April 24, 2022.
At Boston Properties Limited Partnership’s option, loans under the Revolving Facility and Delayed Draw2021 Credit Facility will bear interest at a rate per annum equal to (1) (a) in the case of loans denominated in Dollars, LIBOR, (b) in the case of loans denominated in Euro, or Sterling, LIBOR, and (b)EURIBOR, (c) in the case of loans denominated in Canadian Dollars, CDOR, and (d) in the case of loans denominated in Sterling, SONIA, in each case, plus a margin ranging from 77.570.0 to 155140.0 basis points for the Revolving Commitment and 85 to 175 basis points for the Delayed Draw Facility, based on Boston Properties Limited Partnership’s credit rating or (2) an alternate base rate equal to the greatest of (x)(a) the Federal Funds rate plus 0.5%, (b) the Administrative Agent’s prime rate, (y) the Federal Funds rate plus 0.50% or (z)(c) LIBOR for a one-month period plus 1.00%, and (d) 1.00%, in each case, plus a margin ranging from 0 to 5540 basis points for the Revolving Facility and 0 to 75 basis points for the Delayed Draw Facility, based on Boston Properties Limited Partnership’s credit rating.
The 20172021 Credit Facility also features a sustainability-linked pricing component such that if Boston Properties Limited Partnership meets certain sustainability performance targets, the applicable per annum interest rate will be reduced by one basis point. The LIBOR replacement provisions in the 2021 Credit Facility permit the use of rates based on the secured overnight financing rate administered by the Federal Reserve Bank of New York plus an applicable spread adjustment. In addition, the 2021 Credit Facility contains a competitive bid option for up to 65% of the Revolving Facility that allows banks that are part of the lender consortium to bid to make loan advances to Boston Properties Limited Partnershipat a reduced interest rate.
In addition,Pursuant to the 2021 Credit Facility, Boston Properties Limited Partnership is obligated to pay (1) in quarterly installments a facility fee on the total commitment under the Revolving Facility at a rate per annum ranging from 0.10% to 0.30% based on Boston Properties Limited Partnership’s credit rating and (2) an annual fee on the undrawn amount of each letter of credit equalranging from 0.70% to the LIBOR margin1.40% based on the Revolving Facility and (3) a fee on the unused commitments under the Delayed Draw Facility equal to 0.15% per annum.Boston Properties Limited Partnership’s credit rating.
Based on Boston Properties Limited Partnership’s current credit rating, (1) the applicable Eurocurrency and LIBOR Daily Floating Rate margins for the Revolving Facility and Delayed Draw Facility are 87.5 basis points and 95 basis points, respectively,0.775%, (2) the alternate base rate margin is zero0 basis points for each of the Revolving Facility and Delayed Draw Facility and (3) the facility fee on the Revolving Facility commitment is 0.15% per annum.
The 20172021 Credit Facility contains customary representations and warranties, affirmative and negative covenants, and events of default provisions, including the failure to pay indebtedness, breaches of covenants and bankruptcy and other insolvency events, which could result in the acceleration of the obligation to repay all outstanding amounts and the cancellation of all commitments outstanding under the 2021 Credit Agreement.Facility. Among other covenants, the 20172021 Credit Facility requires that Boston Properties Limited Partnership maintain on an ongoing basis: (1) a leverage ratio not to exceed 60%, however, the leverage ratio may increase to no greater than 65% provided that it is reduced back to 60% within one year, (2) a secured debt leverage ratio not to exceed 55%, (3) a fixed charge coverage ratio of at least 1.40, (4) an unsecured debt leverage ratio not to exceed 60%, however, the unsecured debt leverage ratio may increase to no greater than 65% provided that it is reduced to 60% within one year, (5) an unsecured debt interest coverage ratio of at least 1.75 and (6) limitations on permitted investments.

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6. Derivative Instruments and Hedging Activities
During the year ended December 31, 2015, At September 30, 2021, Boston Properties Limited Partnership commenced a planned interest rate hedging programwas in compliance with each of these financial and entered into 17 forward-starting interest rate swap contracts that fixed the 10-year swap rate at a weighted-average rate of approximately 2.423% per annum on notional amounts aggregating $550.0 million. These interest rate swap contracts were entered into in advance of a financing with a target commencement date in September 2016 and maturity in September 2026. On August 17, 2016, in conjunction with Boston Properties Limited Partnership’s offering of its 2.750% senior unsecured notes due 2026, the Company terminated the forward-starting interest rate swap contracts and cash-settled the contracts by making cash payments to the counterparties aggregating approximately $49.3 million. The Company recognized approximately $0.1 million of losses on interest rate contracts during the year ended December 31, 2016 related to the partial ineffectiveness of the interest rate contracts. The Company is reclassifying into earnings, as an increase to interest expense, approximately $49.2 million (or approximately $4.9 million per year over the 10-year term of the 2.750% senior unsecured notes due 2026) of the amounts recorded in the consolidated balance sheets within accumulated other comprehensive loss, which represents the effective portion of the applicable interest rate contracts. In addition, 767 Fifth Partners LLC, which is a subsidiary of the consolidated entity in which the Company has a 60% interest and owns 767 Fifth Avenue (the General Motors Building) in New York City, entered into 16 forward-starting interest rate swap contracts (including two contracts entered into during the nine months ended September 30, 2016 with notional amounts aggregating $50.0 million) that fix the 10-year swap rate at a weighted-average rate of approximately 2.619% per annum on notional amounts aggregating $450.0 million. These interest rate swap contracts were entered into in advance of a financing with a target commencement date in June 2017 and maturity in June 2027. On April 24, 2017, the consolidated entity that owns 767 Fifth Avenue (the General Motors Building) located in New York City entered into an interest rate lock and commitment agreement with a group of lenders on a ten-year financing totaling $2.3 billion at a fixed interest rate of 3.43% per annum (See Note 5). In conjunction with the interest rate lock and commitment agreement, 767 Fifth Partners LLC terminated the forward-starting interest rate swap contracts and cash-settled the contracts by making cash payments to the counterparties aggregating approximately $14.4 million. 767 Fifth Partners LLC did not record any hedge ineffectiveness. The Company is reclassifying into earnings, as an increase to interest expense, approximately $14.4 million (or approximately $1.4 million per year over the 10-year term of the financing) of the amounts recorded in the Consolidated Balance Sheets within Accumulated Other Comprehensive Loss, which represents the effective portion of the applicable interest rate contracts.covenant requirements.
At September 30, 2017, there were no outstanding interest rate swap contracts. 767 Fifth Partners LLC’s interest rate swap contracts consisted of the following at December 31, 2016 (dollars in thousands):
Derivative Instrument Aggregate Notional Amount Effective Date Maturity Date Strike Rate Range Balance Sheet Location Fair Value
    Low High  
             
Interest Rate Swaps $350,000
 June 7, 2017 June 7, 2027 2.418%-2.950% Other Liabilities $(8,773)
Interest Rate Swaps 100,000
 June 7, 2017 June 7, 2027 2.336%-2.388% Prepaid Expenses and Other Assets 509
  $450,000
           $(8,264)
2021, Boston Properties Limited Partnership entered intohad no amounts outstanding under the interest rate swap contracts designated and qualifying as cash flow hedges to reduce its exposure to the variability in future cash flows attributable to changes in the 10-year swap rate in contemplation of obtaining 10-year fixed-rate financing in September 2016. The Company’s 767 Fifth Partners LLC consolidated entity entered into the interest rate swap contracts designated and qualifying as cash flow hedges to reduce its exposure to the variability in future cash flows attributable to changes in the 10-year swap rate in contemplation of obtaining 10-year fixed-rate financing in June 2017. Boston Properties Limited Partnership has formally documented all of its relationships between hedging instruments and hedged items, as well as its risk-management objective and strategy for undertaking various hedge transactions. Boston Properties Limited Partnership also assesses and documents, both at the hedging instrument’s inception and on an ongoing basis, whether the derivatives that are used in hedging transactions are highly effective in offsetting changes in cash flows associated with the hedged items. All components of the forward-starting interest rate swap contracts were included in the assessment of hedge effectiveness. The Company accounts for the effective portion of changes in the fair value of a derivative in accumulated other comprehensive loss and subsequently reclassifies the effective portion to earnings over the term that the hedged transaction affects earnings. The Company accounts for the ineffective portion of changes in the fair value of a derivative directly in earnings. The Company classifies cash flows related to derivative instruments within its Consolidated Statements of Cash Flows consistent with the nature of the hedged item.

2021 Credit Facility.
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The following table presents the location in the financial statements of the gains (losses) recognized related to the Company’s cash flow hedges for the three and nine months ended September 30, 2017 and 2016:
  Three months ended September 30, Nine months ended September 30,
  2017 2016 2017 2016
  (in thousands)
Amount of gain (loss) related to the effective portion recognized in other comprehensive loss $—
 $5,712
 $(6,133) $(85,285)
Amount of loss related to the effective portion subsequently reclassified to earnings $(1,665) $(1,190) $(4,368) $(2,445)
Amount of loss related to the ineffective portion and amount excluded from effectiveness testing $—
 $(140) $—
 $(140)
Boston Properties, Inc.
The following table reflects the changes in accumulated other comprehensive loss for the nine months ended September 30, 2017 and 2016 (in thousands):
Balance at December 31, 2016 $(52,251)
Effective portion of interest rate contracts (6,133)
Amortization of interest rate contracts 4,368
Other comprehensive loss attributable to noncontrolling interests 2,220
Balance at September 30, 2017 $(51,796)
   
Balance at December 31, 2015 $(14,114)
Effective portion of interest rate contracts (85,285)
Amortization of interest rate contracts 2,445
Other comprehensive loss attributable to noncontrolling interests 23,011
Balance at September 30, 2016 $(73,943)
Boston Properties Limited Partnership
The following table reflects the changes in accumulated other comprehensive loss for the nine months ended September 30, 2017 and 2016 (in thousands):
Balance at December 31, 2016 $(60,853)
Effective portion of interest rate contracts (6,133)
Amortization of interest rate contracts 4,368
Other comprehensive loss attributable to noncontrolling interests 2,272
Balance at September 30, 2017 $(60,346)
   
Balance at December 31, 2015 $(18,337)
Effective portion of interest rate contracts (85,285)
Amortization of interest rate contracts 2,445
Other comprehensive loss attributable to noncontrolling interests 16,134
Balance at September 30, 2016 $(85,043)


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7.9. Commitments and Contingencies
General
In the normal course of business, the Company guarantees its performance of services or indemnifies third parties against its negligence. In addition, in the normal course of business, the Company guarantees to certain tenants the obligations of its subsidiaries for the payment of tenant improvement allowances and brokerage commissions in connection with their leases and limited costs arising from delays in delivery of their premises. 
The Company hashad letter of credit and performance obligations related to lender and development requirements that total approximately $9.1 million.$25.8 million at September 30, 2021.
Certain of the Company’s joint venture agreements include provisions whereby, at certain specified times, each partner has the right to initiate a purchase or sale of its interest in the joint ventures. With limited exception, under these provisions, the Company is not compelled to purchase the interest of its outside joint venture partners. From time to time, under certain of the Company’s joint venture agreements, if certain return thresholds are achieved, either the Company or its partners willmay be entitled to an additional promoted interest or payments. See also Note 8.
From time to time, the Company (or ventures in which the Company has an ownership interest) has agreed, and may in the future agree, to (1) guarantee portions of the principal, interest and other amounts in connection with their borrowings, (2) provide customary environmental indemnifications and nonrecourse carve-outs (e.g., guarantees against fraud, misrepresentation and bankruptcy) in connection with their borrowings and (3) provide guarantees to lenders, tenants and other third parties for the completion of development projects. The Company has agreements with its outside partners whereby the partners agree to reimburse the joint venture for their share of any payments made under the guarantee. In some cases, the Company earns a fee from the applicable joint venture for providing the guarantee.
In connection with the refinancing of 767 Fifth Avenue’s (the General Motors Building) secured loan by the Company’s consolidated joint venture entity, 767 Venture, LLC, the Company guaranteed the consolidated entity’s obligation to fund various reserves for tenant improvement costs and allowances, leasing commissions and free rent obligations in lieu of cash deposits. As of September 30, 2017,2021, the maximum funding obligation under the guarantee was approximately $222.7$20.3 million. The Company earns a fee from the joint venture for providing the guarantee and has an agreement with the outside partners to reimburse the joint venture for their share of any payments made under the guarantee. As of September 30, 2017,2021, no amounts related to the guarantee are recorded as liabilities in the Company’s consolidated financial statements.
Pursuant to the lease agreement with Marriott, the Company has guaranteed the completion of the office building and parking garage on behalf of its 7750 Wisconsin Avenue joint venture and has also agreed to provide anyprovided a financing guaranty that may beas required with respect to the third-party construction financing.  The Company earns a feefees from the joint venture for providing the guarantees and any amounts the Company pays under the guarantee(s) will be deemed to be capital contributions by the Company to the joint venture.  The Company has also agreed to fund construction costs through capital contributions to the joint venture in the event of unavailability or insufficiency of third-party construction financing.  In addition, the Company has guaranteed to Marriott, as hotel manager, the completion of a hotel being developed by an affiliate of The Bernstein Companies (the Company’s partner in the 7750 Wisconsin Avenue joint venture) adjacent to the office property, for which the Company earns a fee from the affiliate of The Bernstein Companies.  In addition, the Company entered into agreements with affiliates of The Bernstein Companies whereby the Company could be required to act as a mezzanine and/or mortgage lender and finance the construction of the hotel property.  An affiliate of The Bernstein Companies exercised its option to borrow $10.0 million from the Company under such agreements, which financing was provided by the Company on June 1, 2020. The financing bears interest at a fixed rate of 8.00% per annum, compounded monthly, and matures on the fifth anniversary of the date on which the base building of the affiliate of The Bernstein Companies’ hotel property is substantially completed. The financing is collateralized by a pledge of the partner’s equity interest in the joint venture that owns and is developing 7750 Wisconsin Avenue. To secure such financing arrangements, affiliates of The Bernstein Companies are required to provide certain security, which varies depending on the specific loan, by pledges of their equity interest in the office property, a fee mortgage on the hotel property, or both. As of September 30, 2017,2021, no amounts related to the contingent aspect of any of the guarantees are recorded as liabilities in the Company’s consolidated financial statements. See also Note 4.
In 2009,connection with the Company filed a general unsecured creditor’s claim against Lehman Brothers, Inc. for approximately $45.3 million related to its rejection of a lease at 399 Park Avenue in New York City. On January 10, 2014, the trustee for the liquidationsale and development of the business of Lehman Brothers allowed the Company’s claim in the amount of approximately $45.2 million. During 2014 and 2015, the Company received distributions of approximately $7.7 million and $8.1 million, respectively. On July 5, 2016, the Company received a fourth interim distribution totaling approximately $1.4 million. On May 19, 2017, the Company received a fifth interim distribution totaling approximately $0.4 million, leaving a remaining claim of approximately $27.6 million. The Company will continue to evaluate whether to attempt to sell the remaining claim or wait until the trustee distributes proceeds from the Lehman Brothers estate. Given the inherent uncertainties in bankruptcy proceedings, there can be no assurance as to the timing or amount of additional proceeds, if any, that the Company may ultimately realize on the remaining claim, whether by sale to a third party or by one or more distributions from the trustee. Accordingly,6595 Springfield Center Drive development project, the Company has not recorded any estimated recoveries associatedguaranteed the completion of the project and the payment of certain cost overruns in accordance with this gain contingency within its Consolidated Financial Statements at September 30, 2017.

the development management agreement with the buyer. Although the project has been sold and the lease with the Federal Government tenant has been assigned to the buyer, pursuant to the terms of the Federal
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Insurance
Government lease, the Federal Government tenant was not obligated to release the prior owner/landlord from such landlord’s obligations under the lease until completion of the construction. As a result, the entity which previously owned the land remains liable to the Federal Government tenant for the completion of the construction obligations under the lease.  The Company carries insurance coverage on its properties, including those under development,buyer is obligated to fund the balance of typesthe costs to meet such construction obligations, subject to the Company’s obligation to fund cost overruns (if any), as noted above. An affiliate of the buyer has provided a guaranty of the obligations of the buyer to fund such construction costs and in amounts and with deductibles that it believes are in line with coverage customarily obtained by owners of similar properties. Certain properties owned in joint ventures with third parties are insured by the third party partner with insurance coverage of types and in amounts and with deductiblesbuyer has agreed to use commercially reasonable efforts to require the construction lender to provide certain remedies to the Company believes are in line with coverage customarily obtained by owners of similar properties. In response to the uncertainty in the insurance market followingevent the terrorist attacksbuyer does not fund such construction obligations. Final completion of the project was achieved during the nine months ended September 11, 2001, the Federal Terrorism Risk Insurance Act (as amended, “TRIA”) was enacted in November 2002 to require regulated insurers to make available coverage for “certified” acts of terrorism (as defined by the statute). The expiration date of TRIA was extended to December 31, 2014 by the Terrorism Risk Insurance Program Reauthorization Act of 2007 and further extended to December 31, 2020 by the Terrorism Risk Insurance Program Reauthorization Act of 2015 (“TRIPRA”),30, 2021 and the Company can provide no assurancehas been released of its guarantee obligations (See Note 3).
In connection with the redevelopment of the Company’s 325 Main Street property located in Cambridge, Massachusetts, the Company was required, pursuant to the local zoning ordinance and urban renewal plan, to commence construction of a residential building of at least 200,000 square feet with 25% of the project designated as income-restricted (with a minimum of 20% of the square footage devoted to home ownership units) prior to the occupancy of the 325 Main Street property, which is expected to occur during the third quarter of 2022. The zoning ordinance and urban renewal plan were each amended to decouple the residential requirement from the occupancy of the 325 Main Street property. The amendment to the urban renewal plan is subject to final approvals and completion of administrative processes. 325 Main Street consisted of an approximately 115,000 net rentable square foot Class A office property that it will be extended further. Currently, thewas demolished and is being developed into an approximately 420,000 net rentable square foot Class A office property, including approximately 41,000 net rentable square feet of retail space.
Insurance
The Company’s property insurance program per occurrence limits are $1.0 billion for its portfolio insurance program, including coverage for acts of terrorism other than nuclear, biological, chemical or radiological terrorism (“Terrorism Coverage”). The Company also carries $250 million of Terrorism Coverage for 601 Lexington Avenue, New York, New York (“601 Lexington Avenue”) in excess of the $1.0 billionof coverage in the Company’s property insurance program. Certain properties, including the General Motors Building located at 767 Fifth Avenue in New York, New York (“767 Fifth Avenue”), are currently insured in separate insurance programs. The property insurance program per occurrence limits for 767 Fifth Avenue are $1.625 billion, including Terrorism Coverage. The Company also currently carries nuclear, biological, chemical and radiological terrorism insurance coverage for acts of terrorism certified under TRIAthe Federal Terrorism Risk Insurance Act (as amended, “TRIA”) (“NBCR Coverage”), which is provided by IXP as a direct insurer, for the properties in ourthe Company’s portfolio, including 767 Fifth Avenue, but excluding certain other properties owned in joint ventures with third parties or which the Company manages. The per occurrence limit for NBCR Coverage is $1.0 billion. Under TRIA, after the payment of the required deductible and coinsurance, the NBCR Coverage provided by IXP is backstopped by the Federal Government if the aggregate industry insured losses resulting from a certified act of terrorism exceed a “program trigger.” In 2017, theThe program trigger is $140$200 million, and the coinsurance is 17%, however, both will increase in subsequent years pursuant20% and the deductible is 20% of the premiums earned by the insurer for the year prior to TRIPRA.a claim. If the Federal Government pays out for a loss under TRIA, it is mandatory that the Federal Government recoup the full amount of the loss from insurers offering TRIA coverage after the payment of the loss pursuant to a formula in TRIPRA.TRIA. The Company may elect to terminate the NBCR Coverage if the Federal Government seeks recoupment for losses paid under TRIA, if TRIA is not extended after its expiration on December 31, 2027, if there is a change in its portfolio or for any other reason. The Company intends to continue to monitor the scope, nature and cost of available terrorism insurance and maintain terrorism insurance in amounts and on terms that are commercially reasonable.insurance.
The Company also currently carries earthquake insurance on its properties located in areas known to be subject to earthquakes in an amount and subject to self-insurance thatearthquakes. Specifically, the Company believescurrently carries earthquake insurance which covers its San Francisco and Los Angeles regions with a $240 million per occurrence limit, and a $240 million annual aggregate limit, $20 million of which is commercially reasonable. In addition, thisprovided by IXP, as a direct insurer. This insurance is subject to a deductible in the amount of 3% of the value of the affected property. Specifically,In addition, the Company currently carries earthquake insurance which covers its San Francisco (including Salesforce Tower) and Los Angeles regionsSeattle region with a $240$60 million (increased from $170 million on March 1, 2017) per occurrence limit, and a $240$60 million (increased from $170 million on March 1, 2017) annual aggregate limit, $20 millionlimit. This insurance is subject to a deductible in the amount of which is provided by IXP, as a direct insurer. Prior to March 1, 2017,2% of the builders risk policy maintained forvalue of the development of Salesforce Tower in San Francisco included a $60 million per occurrence and annual aggregate limit of earthquake coverage.affected property. The amount of the Company’s earthquake insurance coverage may not be sufficient to cover losses from earthquakes. In addition, the amount of earthquake coverage could impact the Company’s ability to finance properties subject to earthquake risk. The Company may discontinue earthquake insurance or change the structure of its earthquake insurance program on some or all of its properties in the future if the premiums exceed the Company’s estimation of the value of the coverage.
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IXP, a captive insurance company which is a wholly-owned subsidiary of the Company, acts as a direct insurer with respect to a portion of the Company’s earthquake insurance coverage for its Greater San Francisco and Los Angeles properties and the Company’s NBCR Coverage. Insofar as the Company owns IXP, it is responsible for its liquidity and capital resources, and the accounts of IXP are part of the Company’s consolidated financial statements. In particular, if a loss occurs which is covered by the Company’s NBCR Coverage but is less than the applicable program trigger under TRIA, IXP would be responsible for the full amount of the loss without any backstop by the Federal Government. IXP would also be responsible for any recoupment charges by the Federal Government in the event losses are paid out and its insurance policy is maintained after the payout by the Federal Government. If the Company experiences a loss and IXP is required to pay under its insurance policy, the Company would ultimately record the loss to the extent of the required payment. Therefore, insurance coverage provided by IXP should not be considered as the equivalent of third-party insurance, but rather as a modified form of self-insurance. In addition, Boston Properties Limited Partnership has issued a guarantee to cover liabilities of IXP in the amount of $20.0 million.
The mortgages onDue to the current COVID-19 pandemic, the Company anticipates the possibility of business interruption, loss of lease revenue and/or other associated expenses related to the Company’s properties typically contain requirements concerningoperations across its portfolio. Because this is an ongoing situation it is not yet possible to quantify the financial ratingsCompany’s losses and expenses, which continue to develop. Because of the insurers who provide policies covering the property. The Company provides the lenders on a regular basis with the identitycomplexity of the insurance companies in the Company’s insurance programs. The ratings of some ofpolicies and limited precedent for claims being made related to pandemics, it is not yet possible to determine if such losses and expenses will be covered by the Company’s insurance policies. Therefore, at this time, the Company has provided notice to the applicable insurers are below the

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rating requirementspotential for claims in some oforder to protect the Company’s loan agreements and the lenders for these loans could attempt to claim that an event of default has occurredrights under the loan. The Company believes it could obtain insurance with insurers which satisfy the rating requirements. Additionally, in the future, the Company’s ability to obtain debt financing secured by individual properties, or the terms of such financing, may be adversely affected if lenders generally insist on ratings for insurers or amounts of insurance which are difficult to obtain or which result in a commercially unreasonable premium. There can be no assurance that a deficiency in the financial ratings of one or more of the Company’s insurers will not have a material adverse effect on the Company.its policies.
The Company continues to monitor the state of the insurance market in general, and the scope and costs of coverage for acts of terrorism, earthquakes and California earthquake riskpandemics, in particular, but the Company cannot anticipate what coverage will be available on commercially reasonable terms in future policy years. There are other types of losses, such as from wars, for which the Company cannot obtain insurance at all or at a reasonable cost. With respect to such losses and losses from acts of terrorism, earthquakes, pandemics or other catastrophic events, if the Company experiences a loss that is uninsured or that exceeds policy limits, the Company could lose the capital invested in the damaged properties, as well as the anticipated future revenues from those properties. Depending on the specific circumstances of each affected property, it is possible that the Company could be liable for mortgage indebtedness or other obligations related to the property. Any such loss could materially and adversely affect the Company’s business and financial condition and results of operations.
8.10. Noncontrolling Interests
Noncontrolling interests relate to the interests in Boston Properties Limited Partnership not owned by Boston Properties, Inc. and interests in consolidated property partnerships not wholly-owned by the Company. As of September 30, 2017,2021, the noncontrolling interests in Boston Properties Limited Partnership consisted of 16,812,32915,989,304 OP Units, 816,9821,487,492 LTIP Units (including 118,067419,423 LTIP Units earned by employees under the Company’s multi-year long-term incentive awards granted between 2012-2018 (i.e., 2012 OPP and 2013-2018 MYLTIP awards)), 219,916 2019 MYLTIP Units, 85,405 2013203,278 2020 MYLTIP Units and 25,107 2014 MYLTIP Units), 366,618 2015 MYLTIP Units, 473,360 2016 MYLTIP Units and 400,000 2017352,021 2021 MYLTIP Units held by parties other than Boston Properties, Inc.
Noncontrolling Interest—Common Units
During the nine months ended September 30, 2017, 492,6172021, 227,233 OP Units were presented by the holders for redemption (including 33,466144,399 OP Units issued upon conversion of LTIP Units, 2012 OPP Units 2013 MYLTIP Units and 2014 MYLTIP Units) and were redeemed by Boston Properties, Inc. in exchange for an equal number of shares of Common Stock.
At September 30, 2017,2021, Boston Properties Limited Partnership had outstanding 366,618 2015219,916 2019 MYLTIP Units, 473,360 2016203,278 2020 MYLTIP Units and 400,000 2017352,021 2021 MYLTIP Units. Prior to the applicable measurement date (February 4, 2018end of the respective three-year performance period for 2015 MYLTIP Units, February 9, 2019 for 2016 MYLTIP Units and February 6, 2020 for 2017 MYLTIP Units),each plan, holders of MYLTIP Units will beare entitled to receive per unit distributions equal to one-tenth (10%) of the regular quarterly distributions payable on an OP Unit, but will not be entitled to receive any special distributions. After the measurement date, the number of MYLTIP Units, both vested and unvested, that MYLTIP award recipients have earned, if any, based on the establishment of a performance pool, will be entitled to receive distributions in an amount per unit equal to distributions, both regular and special, payable on an OP Unit.
On February 3, 2017,5, 2021, the measurement period for the Company’s 20142018 MYLTIP awards ended and, based on Boston Properties, Inc.’s relative TSR performance, the final awards were determined to be 27.7%29.2% of target, or an
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aggregate of approximately $3.5$4.6 million(after (after giving effect to voluntary employee separations and the unallocated reserve)separations). As a result, an aggregate of 447,386 2014285,925 2018 MYLTIP Units that had been previously granted were automatically forfeited.
The following table presents Boston Properties Limited Partnership’s distributions on the OP Units and LTIP Units (including the 2012 OPP Units, and 2013 - 2017 MYLTIP Units and, after the February 3, 20175, 2021 measurement date, the 20142018 MYLTIP Units) and its distributions on the 20142018 MYLTIP Units (prior to the February 3, 20175, 2021 measurement date), 2015 MYLTIP Units, 2016 MYLTIP Units and 20172019 - 2021 MYLTIP Units (after the February 7,2, 2021 issuance date of the 2021 MYLTIP Units) that occurred during the nine months ended September 30, 2021:
Record DatePayment DateDistributions per OP Unit and LTIP UnitDistributions per MYLTIP Unit
September 30, 2021October 29, 2021$0.98 $0.098 
June 30, 2021July 30, 2021$0.98 $0.098 
March 31, 2021April 30, 2021$0.98 $0.098 
December 31, 2020January 28, 2021$0.98 $0.098 
The following table presents Boston Properties Limited Partnership’s distributions on the OP Units and LTIP Units (including the 2012 OPP Units, 2013 - 2016 MYLTIP Units and, after the February 6, 2020 measurement date, the 2017 MYLTIP Units) and its distributions on the 2017 MYLTIP Units (prior to the February 6, 2020 measurement date) and 2018 - 2020 MYLTIP Units (after the February 4, 2020 issuance date) paid in 2017:date of the 2020 MYLTIP Units) that occurred during the nine months ended September 30, 2020:
Record DatePayment DateDistributions per OP Unit and LTIP UnitDistributions per MYLTIP Unit
September 30, 2020October 30, 2020$0.98 $0.098 
June 30, 2020July 31, 2020$0.98 $0.098 
March 31, 2020April 30, 2020$0.98 $0.098 
December 31, 2019January 30, 2020$0.98 $0.098 
Record Date Payment Date Distributions per OP Unit and LTIP Unit Distributions per MYLTIP Unit
September 29, 2017 October 31, 2017 
$0.75
 
$0.075
June 30, 2017 July 31, 2017 
$0.75
 
$0.075
March 31, 2017 April 28, 2017 
$0.75
 
$0.075
December 31, 2016 January 30, 2017 
$0.75
 
$0.075

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A holder of an OP Unit may present the OP Unit to Boston Properties Limited Partnership for redemption at any time (subject to restrictions agreed upon at the time of issuance of OP Units to particular holders that may restrict such redemption right for a period of time, generally one1 year from issuance). Upon presentation of an OP Unit for redemption, Boston Properties Limited Partnership must redeem the OP Unit for cash equal to the then value of a share of common stockCommon Stock of Boston Properties, Inc. Boston Properties, Inc. may, in its sole discretion, elect to assume and satisfy the redemption obligation by paying either cash or issuing one1 share of Common Stock. The value of the OP Units not(not owned by Boston Properties, Inc. and LTIP Units (including the 2012 OPP Units and 2013 MYLTIP Units and 2014- 2018 MYLTIP Units), assuming that all conditions had been met for the conversion thereof,thereof) had all of such units been redeemed at September 30, 20172021 was approximately $2.2$1.9 billion based on the last reported price of a share of Common Stock on the New York Stock Exchange of $122.88$108.35 per share on September 30, 2017.
Boston Properties Limited Partnership
The following table reflects the activity of noncontrolling interests—redeemable partnership units of Boston Properties Limited Partnership for the nine months ended September 30, 2017 and 2016 (in thousands):
Balance at December 31, 2016$2,262,040
Contributions31,465
Net income40,350
Distributions(40,292)
Conversion of redeemable partnership units(16,812)
Unearned compensation(5,194)
Cumulative effect of a change in accounting principle(1,763)
Accumulated other comprehensive income52
Adjustment to reflect redeemable partnership units at redemption value(103,556)
Balance at September 30, 2017$2,166,290
  
Balance at December 31, 2015$2,286,689
Contributions31,492
Net income42,120
Distributions(35,500)
Conversion of redeemable partnership units(5,881)
Unearned compensation(10,072)
Accumulated other comprehensive loss(6,877)
Adjustment to reflect redeemable partnership units at redemption value151,545
Balance at September 30, 2016$2,453,516
2021.
Noncontrolling Interests—Property Partnerships
The noncontrolling interests in property partnerships consist of the outside equity interests in ventures that are consolidated with the financial results of the Company because the Company exercises control over the entities that own the properties. The equity interests in these ventures that are not owned by the Company, totaling approximately $1.7$1.7 billion at at September 30, 20172021 and $1.5 billion at December 31, 2016,2020, are included in Noncontrolling Interests—Property Partnerships inon the accompanying Consolidated Balance Sheets.
On May 12, 2016, the partners in the Company’s consolidated entity that owns Salesforce Tower located in San Francisco, California amended the venture agreement. Under the venture agreement, if the Company elects to fund the construction of Salesforce Tower without a construction loan (or a construction loan of less than 50% of project costs) and the venture has commenced vertical construction of the project, then the partner’s capital funding obligation shall be limited, in which event the Company shall fund up to 2.5% of the total project costs (i.e., 50% of the partner’s 5% interest in the venture) in the form of a loan to the partner. This loan would bear interest at the then prevailing market interest rates for construction loans. Under the amended agreement, the partners have agreed to structure this funding by the Company as preferred equity rather than a loan. The preferred equity contributed by the Company shall earn a preferred return equal to LIBOR plus 3.00% per annum and shall be payable to the Company out of any distributions to which the partner would otherwise be entitled until such preferred equity and preferred return have been repaid to the Company. As of September 30, 2017, the Company had contributed an aggregate of approximately $15.2 million of preferred equity to the venture. Also, under the agreement, (1) the

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partner has the right to cause the Company to purchase the partner’s interest after the defined stabilization date and (2) the Company has the right to acquire the partner’s interest on the third anniversary of the stabilization date, in each case at an agreed upon purchase price or appraised value; provided, however, if certain return thresholds are achieved the partner will be entitled to an additional promoted interest.
On June 6, 2017, in conjunction with the refinancing of the indebtedness of the Company’s consolidated entity in which it has a 60% interest and that owns 767 Fifth Avenue (the General Motors Building) located in New York City, the members of the consolidated entity amended the limited liability company agreement to provide for the contribution of the remaining unpaid principal balance of the members’ notes payable totaling approximately $273.9 million (of which the Company’s share of approximately $164.4 million is eliminated in consolidation) to equity in the consolidated entity, resulting in an increase of approximately $109.6 million to Noncontrolling Interests in Property Partnerships on the Company’s Consolidated Balance Sheets (See Note 5). There were no changes to the ownership interests or rights of the members as a result of the amendment.
The following table reflects the activity of the noncontrolling interests in property partnerships for the nine months ended September 30, 2017 and 2016 (in thousands):
Balance at December 31, 2016$1,530,647
Capital contributions (1)147,772
Net income33,967
Accumulated other comprehensive loss(2,272)
Distributions(41,439)
Balance at September 30, 2017$1,668,675
  
Balance at December 31, 2015$1,574,400
Capital contributions5,417
Net income53
Accumulated other comprehensive loss(16,134)
Distributions(38,694)
Balance at September 30, 2016$1,525,042
 _______________
(1)Includes the contribution of the remaining unpaid principal balance of the members’ notes payable totaling $109,576 to equity in the consolidated entity that owns 767 Fifth Avenue (the General Motors Building).

9.11. Stockholders’ Equity / Partners’ Capital
As of September 30, 2017, Boston Properties, Inc. had 154,322,266 shares of Common Stock outstanding.
As of September 30, 2017,2021, Boston Properties, Inc. had 156,206,491 shares of Common Stock outstanding.
As of September 30, 2021, Boston Properties, Inc. owned 1,719,5161,736,833 general partnership units and 152,602,750154,469,658 limited partnership units ofin Boston Properties Limited Partnership.
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On June 2, 2017,May 22, 2020, Boston Properties, Inc. renewed its “at the market” (“ATM”) stock offering program through which it may sell from time to time up to an aggregate of $600.0 million of its common stockCommon Stock through sales agents over a three-year3-year period. Under the ATM stock offering program, Boston Properties, Inc. may also engage in forward sale transactions with affiliates of certain sales agents for the sale of its Common Stock on a forward basis. This program replaces the Company’sreplaced Boston Properties, Inc.’s prior $600.0 million ATM stock offering program that was scheduled to expire on June 3, 2017. The Company2, 2020. Boston Properties, Inc. intends to use the net proceeds from any offering for general business purposes, which may include investment opportunities and debt reduction. No shares of common stockCommon Stock have been issued under this ATM stock offering program.
During the nine months ended September 30, 2017,2021, Boston Properties, Inc. issued 492,617206,377 shares of Common Stock upon the exercise of options to purchase Common Stock.
During the nine months ended September 30, 2021, Boston Properties, Inc. issued 227,233 shares of Common Stock in connection with the redemption of an equal number of redeemable OP Units from limited partners.

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The following table presents Boston Properties, Inc.’s dividends per share and Boston Properties Limited Partnership’s distributions per OP Unit and LTIP Unit paid or declared in 2017:2021 and during the nine months ended September 30, 2020:
Record Date Payment Date Dividend (Per Share)
 Distribution (Per Unit)
September 29, 2017 October 31, 2017 
$0.75
 
$0.75
June 30, 2017 July 31, 2017 
$0.75
 
$0.75
March 31, 2017 April 28, 2017 
$0.75
 
$0.75
December 31, 2016 January 30, 2017 
$0.75
 
$0.75
Record DatePayment DateDividend (Per Share)Distribution (Per Unit)
September 30, 2021October 29, 2021$0.98 $0.98 
June 30, 2021July 30, 2021$0.98 $0.98 
March 31, 2021April 30, 2021$0.98 $0.98 
December 31, 2020January 28, 2021$0.98 $0.98 
September 30, 2020October 30, 2020$0.98 $0.98 
June 30, 2020July 31, 2020$0.98 $0.98 
March 31, 2020April 30, 2020$0.98 $0.98 
December 31, 2019January 30, 2020$0.98 $0.98 
Preferred Stock
As of September 30, 2017,On March 2, 2021, Boston Properties, Inc. hadissued a redemption notice for 80,000 shares (8,000,000 depositary sharesof its Series B Preferred Stock, which constituted all of the outstanding Series B Preferred Stock, and the corresponding Depositary Shares, each representing 1/100th of a share) outstandingshare of its 5.25% Series B Cumulative RedeemablePreferred Stock. The redemption price per share of Series B Preferred Stock with a liquidation preferencewas equal to $2,500 plus all accrued and unpaid dividend to, but not including, the redemption date, totaling $2,516.41 per share. On March 31, 2021, the Company transferred the full redemption price for all outstanding shares of $2,500.00 per share ($25.00 per depositary share). Boston Properties, Inc. pays cumulative cashSeries B Preferred Stock of approximately $201.3 million including approximately $1.3 million of accrued and unpaid dividends onto, but not including, the redemption date, to the redemption agent. The excess of the redemption price over the carrying value of the Series B Preferred Stock atand Series B Preferred Units of approximately $6.4 million relates to the original issuance costs and is reflected as a rate of 5.25% per annum of the $2,500.00 liquidation preference per share.reduction to Net Income Attributable to Boston Properties, Inc. may not redeemcommon shareholders and Net Income Attributable to Boston Properties Limited Partnership common unitholders on the Consolidated Income Statement.
On April 1, 2021, Boston Properties, Inc. redeemed 80,000 shares of Series B Preferred Stock (including the corresponding 8,000,000 Depositary Shares), which represented all of the outstanding shares of Series B Preferred Stock and all of the outstanding Depositary Shares. In connection with the redemption of the Series B Preferred Stock, prior to March 27, 2018, except in certain circumstances relating toall of the preservationSeries B Preferred Units, which had terms and preferences generally mirroring those of Boston Properties, Inc.’s REIT status. On or after March 27, 2018, Boston Properties, Inc., at its option, may redeem the Series B Preferred Stock, for a cash redemption price of $2,500.00 per share ($25.00 per depositary share), plus all accrued and unpaid dividends. The Series B Preferred Stock is not redeemablewere redeemed by the holders, has no maturity date and is not convertible into any other security of Boston Properties Inc. or its affiliates.Limited Partnership.
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The following table presents Boston Properties, Inc.’s dividends per share on its outstanding Series B Preferred Stock paid or declared during 2017:
2021 and during the nine months ended September 30, 2020:
Record DatePayment DateDividend (Per Share)
November 3, 2017February 5, 2021November 15, 2017February 16, 2021
$32.8125 		$32.8125
August 4, 2017August 15, 2017
$32.8125
November 4, 2020November 16, 2020$32.8125 
August 3, 2020August 17, 2020$32.8125 
May 5, 20171, 2020May 15, 20172020
$32.8125 		$32.8125
February 3, 20174, 2020February 15, 201718, 2020
$32.8125 		$32.8125

12. Segment Information
10.The following tables present reconciliations of Net Income Attributable to Boston Properties, Inc. Common Shareholders to the Company’s share of Net Operating Income and Net Income Attributable to Boston Properties Limited Partnership Common Unitholders to the Company’s share of Net Operating Income for the three and nine monthsended September 30, 2021 and 2020.
Boston Properties, Inc.
 Three months ended September 30,Nine months ended September 30,
2021202020212020
(in thousands)
Net income attributable to Boston Properties, Inc. common shareholders$108,297 $89,854 $311,680 $854,541 
Add:
Preferred stock redemption charge— — 6,412 — 
Preferred dividends— 2,625 2,560 7,875 
Noncontrolling interest—common units of the Operating Partnership11,982 10,020 35,393 97,090 
Noncontrolling interests in property partnerships18,971 15,561 52,602 34,280 
Interest expense105,794 110,993 320,015 319,726 
Losses from early extinguishment of debt— — 898 — 
Loss from unconsolidated joint ventures5,597 6,873 1,745 5,410 
Net operating income from unconsolidated joint ventures24,266 24,938 74,478 81,607 
Depreciation and amortization expense179,412 166,456 539,815 515,738 
Transaction costs1,888 307 2,970 1,254 
Payroll and related costs from management services contracts3,006 2,896 9,166 8,617 
General and administrative expense34,560 27,862 117,924 102,059 
Less:
Net operating income attributable to noncontrolling interests in property partnerships47,800 42,160 138,463 122,248 
Gains (losses) from investments in securities(190)1,858 3,744 965 
Interest and other income (loss)1,520 (45)4,140 4,277 
Gains (losses) on sales of real estate348 (209)8,104 613,723 
Direct reimbursements of payroll and related costs from management services contracts3,006 2,896 9,166 8,617 
Development and management services revenue6,094 7,281 20,181 23,285 
Company’s share of Net Operating Income$435,195 $404,444 $1,291,860 $1,255,082 
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Boston Properties Limited Partnership
 Three months ended September 30,Nine months ended September 30,
 2021202020212020
(in thousands)
Net income attributable to Boston Properties Limited Partnership common unitholders$122,014 $101,624 $353,633 $969,932 
Add:
Preferred unit redemption charge— — 6,412 — 
Preferred distributions— 2,625 2,560 7,875 
Noncontrolling interests in property partnerships18,971 15,561 52,602 34,280 
Interest expense105,794 110,993 320,015 319,726 
Losses from early extinguishment of debt— — 898 — 
Loss from unconsolidated joint ventures5,597 6,873 1,745 5,410 
Net operating income from unconsolidated joint ventures24,266 24,938 74,478 81,607 
Depreciation and amortization expense177,677 164,706 533,255 510,400 
Transaction costs1,888 307 2,970 1,254 
Payroll and related costs from management services contracts3,006 2,896 9,166 8,617 
General and administrative expense34,560 27,862 117,924 102,059 
Less:
Net operating income attributable to noncontrolling interests in property partnerships47,800 42,160 138,463 122,248 
Gains (losses) from investments in securities(190)1,858 3,744 965 
Interest and other income (loss)1,520 (45)4,140 4,277 
Gains (losses) on sales of real estate348 (209)8,104 626,686 
Direct reimbursements of payroll and related costs from management services contracts3,006 2,896 9,166 8,617 
Development and management services revenue6,094 7,281 20,181 23,285 
Company’s share of Net Operating Income$435,195 $404,444 $1,291,860 $1,255,082 
Net operating income (“NOI”) is a non-GAAP financial measure equal to net income attributable to Boston Properties, Inc. common shareholders and net income attributable to Boston Properties Limited Partnership common unitholders, as applicable, the most directly comparable GAAP financial measures, plus (1) preferred stock/unit redemption charge, preferred dividends/distributions, net income attributable to noncontrolling interests, interest expense, losses from early extinguishment of debt, loss from unconsolidated joint ventures, depreciation and amortization expense, transaction costs, payroll and related costs from management services contracts and corporate general and administrative expense less (2) gains (losses) from investments in securities, interest and other income (loss), gains (losses) on sales of real estate, direct reimbursements of payroll and related costs from management services contracts and development and management services revenue. The Company believes NOI is useful to investors as a performance measure and believes it provides useful information to investors regarding its results of operations and financial condition because, when compared across periods, it reflects the impact on operations from trends in occupancy rates, rental rates, operating costs and acquisition and development activity on an unleveraged basis, providing perspective not immediately apparent from net income attributable to Boston Properties, Inc. common shareholders and net income attributable to Boston Properties Limited Partnership common unitholders. For example, interest expense is not necessarily linked to the operating performance of a real estate asset and is often incurred at the corporate level as opposed to the property level. Similarly, interest expense may be incurred at the property level even though the financing proceeds may be used at the corporate level (e.g., used for other investment activity). In addition, depreciation and amortization expense, because of historical cost accounting and useful life estimates, may distort operating performance measures at the property level. NOI
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presented by the Company may not be comparable to NOI reported by other REITs or real estate companies that define NOI differently.
The Company’s internal reporting utilizes its share of NOI, which includes its share of NOI from consolidated and unconsolidated joint ventures, which is a non-GAAP financial measure that is calculated as the consolidated amount, plus the Company’s share of the amount from the Company’s unconsolidated joint ventures (calculated based upon the Company’s economic percentage ownership interest and, in some cases, after priority allocations), minus the Company’s partners’ share of the amount from the Company’s consolidated joint ventures (calculated based upon the partners’ economic percentage ownership interests and, in some cases, after priority allocations, income allocation to private REIT shareholders and their share of fees due to the Company). The Company’s share of NOI from unconsolidated joint ventures does not include its share of gains on sales of real estate from unconsolidated joint ventures and gain on sale of investment from unconsolidated joint ventures, both of which are included within Loss From Unconsolidated Joint Ventures in the Company’s Consolidated Statements of Operations.  Management utilizes its share of NOI in assessing its performance as the Company has several significant joint ventures and, in some cases, the Company exercises significant influence over, but does not control, the joint venture, in which case GAAP requires that the Company account for the joint venture entity using the equity method of accounting and the Company does not consolidate it for financial reporting purposes. In other cases, GAAP requires that the Company consolidate the venture even though the Company’s partner(s) owns a significant percentage interest. As a result, the presentations of the Company’s share of NOI should not be considered a substitute for, and should only be considered together with and as a supplement to, the Company’s financial information presented in accordance with GAAP.
Asset information by segment is not reported because the Company does not use this measure to assess performance. Therefore, depreciation and amortization expense is not allocated among segments. Preferred stock/unit redemption charge, preferred dividends/distributions, interest expense, losses from early extinguishment of debt, loss from unconsolidated joint ventures, depreciation and amortization expense, transaction costs, payroll and related costs from management services contracts, corporate general and administrative expense, gains (losses) from investments in securities, interest and other income (loss), gains (losses) on sales of real estate, direct reimbursements of payroll and related costs from management services contracts and development and management services revenue are not included in NOI and are provided as reconciling items to the Company’s reconciliations of its share of NOI to net income attributable to common shareholders/unitholders.
The Company’s segments are based on the Company’s method of internal reporting which classifies its operations by geographic area. The Company’s segments by geographic area are Boston, Los Angeles, New York, San Francisco, Seattle and Washington, DC. On September 1, 2021, the Company invested into a joint venture that acquired Safeco Plaza located in Seattle, Washington (See Note 5). As such, the Seattle region was identified as a segment during the third quarter of 2021. The Company also presents information for each segment by property type, including Office, Residential and Hotel.
Included within the Office property type are commercial office and retail leases, as well as parking revenue.  Any write-off for bad debt, including accrued rent, will be recorded as a reduction to lease revenue. During the nine months ended September 30, 2021, the Company wrote off approximately $1.3 million related to accrued rent, net balances and accounts receivable, net balances. There were no write-offs related to accrued rent, net balances and accounts receivable, net balances for the three months ended September 30, 2021. During the three and nine months ended September 30, 2020, the Company wrote off approximately $7.5 million and $63.8 million, respectively, related to accrued rent, net balances and accounts receivable, net balances. The write-offs were for tenants, primarily in the retail sector, that either terminated their leases or for which the Company considered their accrued rent and/or accounts receivable balances were no longer probable of collection.
In addition, parking and other revenue for the three months ended September 30, 2021 increased by approximately $7.2 million compared to the three months ended September 30, 2020. Parking and other revenue for the nine months ended September 30, 2021 increased by approximately $4.0 million compared to 2020.
The Boston Marriott Cambridge closed in March 2020 due to COVID-19. The hotel re-opened on October 2, 2020 and has operated at lower occupancy levels due to the continued impact of COVID-19 on business and leisure travel. The closing of the hotel for more than two fiscal quarters, and the lower demand and low occupancy since its re-opening, have had, and are expected to continue to have, a material adverse effect on the hotel’s operations and thus the results of the Company’s Hotel property type.
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Information by geographic area and property type (dollars in thousands):
For the three months ended September 30, 2021:
BostonLos AngelesNew YorkSan FranciscoSeattleWashington, DCTotal
Rental Revenue: (1)
Office$236,080 $— $257,656 $125,340 $— $85,797 $704,873 
Residential3,418 — — 806 — 6,670 10,894 
Hotel5,189 — — — — — 5,189 
Total244,687 — 257,656 126,146 — 92,467 720,956 
% of Grand Totals33.93 %— %35.74 %17.50 %— %12.83 %100.00 %
Rental Expenses:
Office82,697 — 94,338 43,582 — 31,619 252,236 
Residential1,396 — — 1,688 — 2,961 6,045 
Hotel3,946 — — — — — 3,946 
Total88,039 — 94,338 45,270 — 34,580 262,227 
% of Grand Totals33.57 %— %35.98 %17.26 %— %13.19 %100.00 %
Net operating income$156,648 $— $163,318 $80,876 $— $57,887 $458,729 
% of Grand Totals34.15 %— %35.60 %17.63 %— %12.62 %100.00 %
Less: Net operating income attributable to noncontrolling interests in property partnerships(10,841)— (36,959)— — — (47,800)
Add: Company’s share of net operating income from unconsolidated joint ventures3,464 12,078 104 3,502 671 4,447 24,266 
Company’s share of net operating income$149,271 $12,078 $126,463 $84,378 $671 $62,334 $435,195 
% of Grand Totals34.30 %2.78 %29.06 %19.39 %0.15 %14.32 %100.00 %
  _______________
(1)Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.
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For the three months ended September 30, 2020:
BostonLos AngelesNew YorkSan FranciscoWashington, DCTotal
Rental Revenue: (1)
Office$225,652 $— $239,535 $128,165 $79,931 $673,283 
Residential3,043 — — 23 6,652 9,718 
Hotel90 — — — — 90 
Total228,785 — 239,535 128,188 86,583 683,091 
% of Grand Totals33.48 %— %35.07 %18.77 %12.68 %100.00 %
Rental Expenses:
Office81,890 — 97,904 41,518 31,994 253,306 
Residential1,350 — — 740 2,865 4,955 
Hotel3,164 — — — — 3,164 
Total86,404 — 97,904 42,258 34,859 261,425 
% of Grand Totals33.05 %— %37.46 %16.16 %13.33 %100.00 %
Net operating income$142,381 $— $141,631 $85,930 $51,724 $421,666 
% of Grand Totals33.77 %— %33.58 %20.38 %12.27 %100.00 %
Less: Net operating income attributable to noncontrolling interests in property partnerships(10,228)— (31,932)— — (42,160)
Add: Company’s share of net operating income from unconsolidated joint ventures2,764 11,953 539 4,098 5,584 24,938 
Company’s share of net operating income$134,917 $11,953 $110,238 $90,028 $57,308 $404,444 
% of Grand Totals33.35 %2.96 %27.26 %22.26 %14.17 %100.00 %
  _______________
(1)Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.

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For the nine months ended September 30, 2021:
BostonLos AngelesNew YorkSan FranciscoSeattleWashington, DCTotal
Rental Revenue: (1)
Office$696,054 $— $760,002 $382,119 $— $252,822 $2,090,997 
Residential9,594 — — 1,817 — 18,421 29,832 
Hotel7,382 — — — — — 7,382 
Total713,030 — 760,002 383,936 — 271,243 2,128,211 
% of Grand Totals33.50 %— %35.71 %18.04 %— %12.75 %100.00 %
Rental Expenses:
Office240,743 — 286,385 124,785 — 94,360 746,273 
Residential4,286 — — 4,918 — 8,896 18,100 
Hotel7,993 — — — — — 7,993 
Total253,022 — 286,385 129,703 — 103,256 772,366 
% of Grand Totals32.76 %— %37.08 %16.79 %— %13.37 %100.00 %
Net operating income$460,008 $— $473,617 $254,233 $— $167,987 $1,355,845 
% of Grand Totals33.93 %— %34.93 %18.75 %— %12.39 %100.00 %
Less: Net operating income attributable to noncontrolling interests in property partnerships(31,641)— (106,822)— — — (138,463)
Add: Company’s share of net operating income from unconsolidated joint ventures9,369 38,535 (517)10,562 671 15,858 74,478 
Company’s share of net operating income$437,736 $38,535 $366,278 $264,795 $671 $183,845 $1,291,860 
% of Grand Totals33.88 %2.98 %28.35 %20.50 %0.05 %14.24 %100.00 %
  _______________
(1)Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.

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For the nine months ended September 30, 2020:
BostonLos AngelesNew YorkSan FranciscoWashington, DCTotal
Rental Revenue: (1)
Office$683,501 $— $699,063 $393,137 $256,904 $2,032,605 
Residential10,512 — — 23 18,541 29,076 
Hotel7,014 — — — — 7,014 
Total701,027 — 699,063 393,160 275,445 2,068,695 
% of Grand Totals33.89 %— %33.79 %19.01 %13.31 %100.00 %
Rental Expenses:
Office240,129 — 285,411 123,168 99,322 748,030 
Residential3,925 — — 740 8,319 12,984 
Hotel11,958 — — — — 11,958 
Total256,012 — 285,411 123,908 107,641 772,972 
% of Grand Totals33.12 %— %36.92 %16.03 %13.93 %100.00 %
Net operating income$445,015 $— $413,652 $269,252 $167,804 $1,295,723 
% of Grand Totals34.35 %— %31.92 %20.78 %12.95 %100.00 %
Less: Net operating income attributable to noncontrolling interests in property partnerships(31,467)— (90,781)— — (122,248)
Add: Company’s share of net operating income from unconsolidated joint ventures8,490 42,909 2,110 11,384 16,714 81,607 
Company’s share of net operating income$422,038 $42,909 $324,981 $280,636 $184,518 $1,255,082 
% of Grand Totals33.63 %3.42 %25.89 %22.36 %14.70 %100.00 %
  _______________
(1)Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.

13. Earnings Per Share / Common Unit
Boston Properties, Inc.
The following table provides a reconciliation of both the net income attributable to Boston Properties, Inc. common shareholders and the number of common shares used in the computation of basic earnings per share (“EPS”), which is calculated by dividing net income attributable to Boston Properties, Inc. common shareholders by the weighted-average number of common shares outstanding during the period. Unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are also participating securities. As such, unvested restricted common stock of the Company,Boston Properties, Inc. and Boston Properties Limited Partnership’s LTIP Units, 2012 OPP Units and MYLTIP Units are considered participating securities. Participating securities are included in the computation of basic EPS of the CompanyBoston Properties, Inc. using the two-class method. Participating securities are included in the computation of diluted EPS of the CompanyBoston Properties, Inc. using the if-converted method if the impact is dilutive. Because the 2012 OPP Units and 2013 MYLTIP Units and 2014- 2018 MYLTIP Units required, and the 2015-20172019 - 2021 MYLTIP Units require, the CompanyBoston Properties, Inc. to outperform absolute andand/or relative return thresholds, unless such thresholds have been met by the end of the applicable reporting period, the CompanyBoston Properties, Inc. excludes such units from the diluted EPS calculation. Other potentially dilutive common shares, including stock options, restricted stock and other securities of Boston Properties Limited Partnership that are exchangeable for the Boston Properties, Inc.’s Common Stock, and the related impact on earnings, are considered when calculating diluted EPS.




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Three months ended September 30, 2021
Income
(Numerator)		Shares
(Denominator)		Per Share
Amount
(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc. common shareholders$108,297 156,183 $0.69 
Effect of Dilutive Securities:
Stock Based Compensation— 415 — 
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders$108,297 156,598 $0.69 
Three months ended September 30, 2020
Income
(Numerator)		Shares
(Denominator)		Per Share
Amount
(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc. common shareholders$89,854 155,645 $0.58 
Effect of Dilutive Securities:
Stock Based Compensation— 25 — 
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders$89,854 155,670 $0.58 
 Nine months ended September 30, 2021
 Income
(Numerator)		Shares
(Denominator)		Per Share
Amount
 (in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc. common shareholders$311,680 156,062 $2.00 
Effect of Dilutive Securities:
Stock Based Compensation— 332 (0.01)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders$311,680 156,394 $1.99 
42
 Three months ended September 30, 2017
 
Income
(Numerator)
 
Shares
(Denominator)
 
Per Share
Amount
 (in thousands, except for per share amounts)
Basic Earnings:     
Net income attributable to Boston Properties, Inc. common shareholders$117,337
 154,355
 $0.76
Allocation of undistributed earnings to participating securities(7) —
 —
Net income attributable to Boston Properties, Inc. common shareholders$117,330
 154,355
 $0.76
Effect of Dilutive Securities:     
Stock Based Compensation—
 128
 —
Diluted Earnings:     
Net income attributable to Boston Properties, Inc. common shareholders$117,330
 154,483
 $0.76
      
 Three months ended September 30, 2016
 
Income
(Numerator)
 
Shares
(Denominator)
 
Per Share
Amount
 (in thousands, except for per share amounts)
Basic Earnings:     
Net income attributable to Boston Properties, Inc. common shareholders$76,753
 153,754
 $0.50
Effect of Dilutive Securities:     
Stock Based Compensation—
 382
 —
Diluted Earnings:     
Net income attributable to Boston Properties, Inc. common shareholders$76,753
 154,136
 $0.50
      
 Nine months ended September 30, 2017
 
Income
(Numerator)
 
Shares
(Denominator)
 
Per Share
Amount
 (in thousands, except for per share amounts)
Basic Earnings:     
Net income attributable to Boston Properties, Inc. common shareholders$348,086
 154,132
 $2.26
Allocation of undistributed earnings to participating securities(15) —
 —
Net income attributable to Boston Properties, Inc. common shareholders$348,071
 154,132
 $2.26
Effect of Dilutive Securities:     
Stock Based Compensation—
 212
 —
Diluted Earnings:     
Net income attributable to Boston Properties, Inc. common shareholders$348,071
 154,344
 $2.26
      

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Nine months ended September 30, 2016 Nine months ended September 30, 2020
Income
(Numerator)
 
Shares
(Denominator)
 
Per Share
Amount
 Income
(Numerator)		Shares
(Denominator)		Per Share
Amount
(in thousands, except for per share amounts) (in thousands, except for per share amounts)
Basic Earnings:     Basic Earnings:
Net income attributable to Boston Properties, Inc. common shareholders$355,114
 153,681
 $2.31
Net income attributable to Boston Properties, Inc. common shareholders$854,541 155,349 $5.50 
Allocation of undistributed earnings to participating securities(189) —
 —
Allocation of undistributed earnings to participating securities(1,150)— (0.01)
Net income attributable to Boston Properties, Inc. common shareholders$354,925
 153,681
 $2.31
Net income attributable to Boston Properties, Inc. common shareholders$853,391 155,349 $5.49 
Effect of Dilutive Securities:     Effect of Dilutive Securities:
Stock Based Compensation—
 290
 —
Stock Based Compensation— 98 — 
Diluted Earnings:     Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders$354,925
 153,971
 $2.31
Net income attributable to Boston Properties, Inc. common shareholders$853,391 155,447 $5.49 
Boston Properties Limited Partnership
The following table provides a reconciliation of both the net income attributable to Boston Properties Limited Partnership common unitholders and the number of common units used in the computation of basic earnings per common unit, which is calculated by dividing net income attributable to Boston Properties Limited Partnership common unitholders by the weighted-average number of common units outstanding during the period. Unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are also participating securities. As such, unvested restricted common stock of Boston Properties, Inc. and Boston Properties Limited Partnership’s LTIP Units, 2012 OPP Units and MYLTIP Units are considered participating securities. Participating securities are included in the computation of basic earnings per common unit using the two-class method. Participating securities are included in the computation of diluted earnings per common unit using the if-converted method if the impact is dilutive. Because the 2012 OPP Units and 2013 MYLTIP Units and 2014- 2018 MYLTIP Units required, and the 2015-20172019 - 2021 MYLTIP Units require, Boston Properties, Inc. to outperform absolute andand/or relative return thresholds, unless such thresholds have been met by the end of the applicable reporting period, Boston Properties Limited Partnership excludes such units from the diluted earnings per common unit calculation. Other potentially dilutive common units and the related impact on earnings are considered when calculating diluted earnings per common unit. Included in the number of units (the denominator) below are approximately 17,336,00017,011,000 and 17,625,00017,032,000 redeemable common units for the three months ended September 30, 20172021 and 2016,2020, respectively, and 17,517,00017,016,000 and 17,672,00017,279,000 redeemable common units for the nine months ended September 30, 20172021, and 2016,2020, respectively.
Three months ended September 30, 2017 Three months ended September 30, 2021
Income
(Numerator)
 
Units
(Denominator)
 
Per Unit
Amount
 Income
(Numerator)		Units
(Denominator)		Per Unit
Amount
(in thousands, except for per unit amounts) (in thousands, except for per unit amounts)
Basic Earnings:     Basic Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders$132,693
 171,691
 $0.77
Net income attributable to Boston Properties Limited Partnership common unitholders$122,014 173,194 $0.70 
Allocation of undistributed earnings to participating securities(8) —
 —
Net income attributable to Boston Properties Limited Partnership common unitholders$132,685
 171,691
 $0.77
Effect of Dilutive Securities:     Effect of Dilutive Securities:
Stock Based Compensation—
 128
 —
Stock Based Compensation— 415 — 
Diluted Earnings:     Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders$132,685
 171,819
 $0.77
Net income attributable to Boston Properties Limited Partnership common unitholders$122,014 173,609 $0.70 
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Three months ended September 30, 2020
Income
(Numerator)		Units
(Denominator)		Per Unit
Amount
(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders$101,624 172,677 $0.59 
Effect of Dilutive Securities:
Stock Based Compensation— 25 — 
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders$101,624 172,702 $0.59 
Nine months ended September 30, 2021
Income
(Numerator)		Units
(Denominator)		Per Unit
Amount
(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders$353,633 173,078 $2.04 
Effect of Dilutive Securities:
Stock Based Compensation— 332 — 
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders$353,633 173,410 $2.04 
 Nine months ended September 30, 2020
 Income
(Numerator)		Units
(Denominator)		Per Unit
Amount
 (in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders$969,932 172,628 $5.62 
Allocation of undistributed earnings to participating securities(1,278)— (0.01)
Net income attributable to Boston Properties Limited Partnership common unitholders$968,654 172,628 $5.61 
Effect of Dilutive Securities:
Stock Based Compensation— 98 — 
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders$968,654 172,726 $5.61 
 Three months ended September 30, 2016
 
Income
(Numerator)
 
Units
(Denominator)
 
Per Unit
Amount
 (in thousands, except for per unit amounts)
Basic Earnings:     
Net income attributable to Boston Properties Limited Partnership common unitholders$91,306
 171,379
 $0.53
Effect of Dilutive Securities:     
Stock Based Compensation—
 382
 —
Diluted Earnings:     
Net income attributable to Boston Properties Limited Partnership common unitholders$91,306
 171,761
 $0.53
      
 Nine months ended September 30, 2017
 
Income
(Numerator)
 
Units
(Denominator)
 
Per Unit
Amount
 (in thousands, except for per unit amounts)
Basic Earnings:     
Net income attributable to Boston Properties Limited Partnership common unitholders$395,199
 171,649
 $2.30
Allocation of undistributed earnings to participating securities(17) —
 —
Net income attributable to Boston Properties Limited Partnership common unitholders$395,182
 171,649
 $2.30
Effect of Dilutive Securities:     
Stock Based Compensation—
 212
 —
Diluted Earnings:     
Net income attributable to Boston Properties Limited Partnership common unitholders$395,182
 171,861
 $2.30
      
 Nine months ended September 30, 2016
 
Income
(Numerator)
 
Units
(Denominator)
 
Per Unit
Amount
 (in thousands, except for per unit amounts)
Basic Earnings:     
Net income attributable to Boston Properties Limited Partnership common unitholders$408,540
 171,353
 $2.38
Allocation of undistributed earnings to participating securities(210) —
 —
Net income attributable to Boston Properties Limited Partnership common unitholders$408,330
 171,353
 $2.38
Effect of Dilutive Securities:     
Stock Based Compensation—
 290
 —
Diluted Earnings:     
Net income attributable to Boston Properties Limited Partnership common unitholders$408,330
 171,643
 $2.38
      
11.14. Stock Option and Incentive Plan
On January 25, 2017,February 2, 2021, Boston Properties, Inc.’s Compensation Committee approved the 20172021 MYLTIP awards under the Boston Properties, Inc.’s 2012 Stock Option and Incentive Plan (the “2012 Plan”) to certain officers and employees of Boston Properties, Inc. The 20172021 MYLTIP awards consist of two, equally weighted (50% each) components that utilize Boston Properties, Inc.’s total stockholder return (“TSR”)TSR over a three-year measurement period on an annualized, compounded basis, as the performance metric. Earned
The first component of the 2021 MYLTIP, which represents one-half (50%) of the target grant-date value, retains the basic general structure of the 2020 MYLTIP awards will be based on Boston

with certain changes, including a change to the
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custom peer index against which Boston Properties, Inc.’s TSR is compared. The number of LTIP Units that can be earned under this component ranges from zero to 200% of the target number of LTIP Units, based on Boston Properties, Inc.’s annualized relative TSR performance compared to (i)a custom index. Under this component, 100% of the Cohen & Steers Realty Majors Portfolio Indextarget number of LTIP Units will be earned if Boston Properties, Inc.’s TSR equals the custom index TSR; for relative TSR performance between -1,000 basis points and +1,000 basis points, the number of LTIP Units earned will be determined using linear interpolation.
The second component represents the remaining one-half (50% weight)) of the target grant-date value of the 2021 MYLTIP. The number of LTIP Units that can be earned under this component ranges from zero to 200% of the target number of LTIP Units, based on Boston Properties, Inc.’s cumulative absolute TSR during the performance period. Under this component, 100% of the target number of LTIP Units will be earned if Boston Properties, Inc.’s achieves an absolute TSR equal to +1,000 basis points; if Boston Properties, Inc.’s absolute TSR is greater than -4,000 basis points but less than +6,000 basis points, then the number of LTIP Units earned will be determined using linear interpolation.
Total earned awards under the 2021 MYLTIP, if any, will equal the sum of the number of LTIP Units earned under the first and (ii) the NAREIT Office Index adjusted to include Vornado Realty Trust (50% weight). Earned awardssecond components and will range from zero to a maximum of 352,021 LTIP Units with a target of approximately $42.7 million depending on Boston Properties, Inc.’s TSR relative to the two indices, with four tiers (threshold: approximately $10.7 million; target: approximately $21.3 million; high: approximately $32.0 million; exceptional: approximately $42.7 million)176,009 LTIP Units and linear interpolation between tiers. Earned awards measured on the basis of relative TSR performance are subject to an absolute TSR component in the form of relatively simple modifiers that (A) reduce the level of earned awards in the event Boston Properties, Inc.’s annualized TSR is less than 0%zero and (B) cause some awards to be earned in the event Boston Properties, Inc.’s annualized TSR is more than 12% even though on a relative basis alone Boston Properties, Inc.’s TSR would not result in any earned awards.
maximum. Earned awards (if any) will vest 50%100% on February 6, 2020 and 50% on February 6, 2021, based on continued employment.1, 2024, but may not be converted, redeemed, sold or otherwise transferred for one additional year thereafter. Vesting will be accelerated in the event of a change in control, termination of employment by Boston Properties, Inc. without cause, or termination of employment by the award recipient for good reason, death, disability or retirement. If there is a change of control prior to February 6, 2020,1, 2024, earned awards will be calculated based on TSR performance up to the date of the change of control. The 20172021 MYLTIP awards are in the form of LTIP Units issued on the grant date, which (i)and they are subject to forfeiture to the extent awards are not earned and (ii) priorearned. Prior to the performance measurement date holders of the 2021 MYLTIP Units are only entitled to one-tenth (10%) of the regular quarterly distributions payable on common partnership unitsunits. Following the completion of the three-year performance period, Boston Properties, Inc. will also make a “catch-up” cash payment on the 2021 MYLTIP Units that are ultimately earned in an amount equal to the regular and no special distributions.
distributions, if any, declared during the performance period on Boston Properties, Inc.’s common stock, less the distributions actually paid to holders of 2021 MYLTIP Units during the performance period on all of the awarded 2021 MYLTIP Units. Under ASC 718 “Compensation - Stock Compensation,” the 20172021 MYLTIP awards have an aggregate value of approximately $17.7$15.3 million, which amount will generally be amortized into earnings over the four-year plan period under the graded vesting method.
On February 3, 2017,5, 2021, the measurement period for the Company’s 20142018 MYLTIP awards ended and, based on Boston Properties, Inc.’s relative TSR performance, the final awards were determined to be 27.7%29.2% of target, or an aggregate of approximately $3.5$4.6 million(after (after giving effect to voluntary employee separations and the unallocated reserve)separations). As a result, an aggregate of 447,386 2014285,925 2018 MYLTIP Units that had been previously granted were automatically forfeited.
At Boston Properties, Inc.’s 2021 annual meeting of stockholders held on May 20, 2021, its stockholders approved the Boston Properties, Inc. 2021 Stock Incentive Plan (the “2021 Plan”). The 2021 Plan replaces the 2012 Plan and no further awards will be granted under the 2012 Plan. The material features of the 2021 Plan include, among other things: (i) the maximum number of shares of Common Stock reserved and available for issuance under the 2021 Plan is 5,400,000 shares less one share for every one share that was granted between March 4, 2021 and May 19, 2021 under the 2012 Plan, (ii) shares of Common Stock underlying awards granted under the 2021 Plan or the 2012 Plan that are forfeited, canceled or otherwise terminated (other than by exercise) will be added back to the shares of Common Stock available for issuance under the 2021 Plan and, with respect to “full-value” awards under the 2021 Plan or the 2012 Plan, shares tendered or held back for taxes and shares previously reserved for issuance pursuant to such an award to the extent that such shares are not issued and are no longer issuable pursuant to such an award (e.g., in the event that a full-value award that may be settled in cash or by issuance of shares of Common Stock is settled in cash) will be added back to the shares available for issuance under the 2021 Plan, (iii) the award of stock options (both incentive and non-qualified options), stock appreciation rights, restricted stock units, restricted stock, unrestricted stock, dividend equivalent rights, cash-based awards and other equity-based awards (including LTIP Units) is permitted, (iv) stock options may not be repriced and “underwater” stock options may not be exchanged for another award or cash without stockholder approval; and (v) the term of the 2021 Plan is for ten years from the date of stockholder approval.
During the nine months ended September 30, 2017,2021, Boston Properties, Inc. issued 37,41456,841 shares of restricted common stock and Boston Properties Limited Partnership issued 111,488281,640 LTIP Units and 400,000 2017352,021 2021 MYLTIP Units to employees and non-employee directorsdirector advisors under the 2012 Plan and the 2021 Plan. Employees and non-employee directors paid $0.01 per share of restricted common stock and $0.25 per LTIP Unit and 20172021 MYLTIP Unit. When issued, LTIP
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Units are not economically equivalent in value to a share of Common Stock, but over time can increase in value to one-for-one parity with Common Stock if there is sufficient appreciation in the value of the Company’s assets. The aggregate value of the LTIP Units is included in noncontrolling interests in the Consolidated Balance Sheets. GrantsSheets of Boston Properties, Inc. and Boston Properties Limited Partnership. A substantial majority of the grants of restricted common stock and LTIP Units to employees vest in four equal annual installments. Restricted common stock is measured at fair value on the date of grant based on the number of shares granted and the closing price of Boston Properties, Inc.’s Common Stock on the date of grant as quoted on the New York Stock Exchange. Such value is recognized as an expense ratably over the corresponding employee service period. The shares of restricted common stock granted during the nine months ended September 30, 20172021 were valued at approximately $4.9$5.7 million ($130.32100.46 per share weighted-average). The LTIP Units granted were valued at approximately $13.3$23.8 million (approximately $119.52$84.43 per unit weighted-average fair value) using a Monte Carlo simulation method model. The per unit fair values of the LTIP Units granted were estimated on the dates of grant and for a substantial majority of such units were valued using the following assumptions: an expected life of 5.7 years, a risk-free interest rate of 2.14%0.65% and an expected price volatility of 28.0%30.0%. AsBecause the 2012 OPP Units and 2013 MYLTIP Units, 2014 MYLTIP Units, 2015 MYLTIP Units, 2016 MYLTIP Units and 2017- 2021 MYLTIP Units are subject to both a service condition and a market condition, the Company recognizes the related compensation expense related to the 2012 OPP Units, 2013 MYLTIP Units, 2014 MYLTIP Units, 2015 MYLTIP Units, 2016 MYLTIP Units and 2017 MYLTIP Units under the graded vesting attribution method. Under the graded vesting attribution method, each portion of the award that vests at a different date is accounted for as a separate award and recognized over the period appropriate to that portion so that the compensation cost for each portion should be recognized in full by the time that portion vests. The Company recognizes forfeitures as they occur on its awards of stock-based compensation (See Note 2).compensation. Dividends paid on both vested and unvested shares of restricted stock are charged directly to Dividends in Excess of Earnings in Boston Properties, Inc.’s Consolidated Balance Sheets and Partners’ Capital in Boston Properties Limited Partnership’s Consolidated Balance Sheets. Aggregate stock-based compensation expense associated with restricted stock, non-qualified stock options, LTIP Units 2012 OPP Units, 2013 MYLTIP Units, 2014 MYLTIP Units, 2015 MYLTIP Units, 2016 MYLTIP Units and 2017 MYLTIP Units was approximately $7.5$8.4 million and $7.1$8.0 million for the three months ended September 30, 20172021 and 2016,2020, respectively, and $25.6$42.2 million and $23.6$35.3 million for the nine months ended September 30, 20172021 and 2016,2020, respectively. At September 30, 2017,2021, there was (1) an aggregate of approximately $22.8$28.4 million of unrecognized compensation expense related to unvested restricted stock, LTIP Units 2013 MYLTIP Units and 20142018 MYLTIP Units and (2) an aggregate of approximately $24.7$9.4 million of unrecognized compensation expense related to unvested 2015 MYLTIP Units, 2016 MYLTIP Units and 20172019 - 2021 MYLTIP Units that is expected to be recognized over a weighted-average period of approximately 2.52.1 years.
12. Segment Information15. Subsequent Events
The following tables present reconciliations of Net Income Attributable to Boston Properties, Inc. Common Shareholders to Net Operating Income and Net Income Attributable toOn October 15, 2021, Boston Properties Limited Partnership Common Unitholdersused available cash and funds under its 2021 Credit Facility to Net Operating Incomecomplete the redemption of $1.0 billion in aggregate principal amount of its 3.85% senior notes due February 1, 2023. The redemption price was approximately $1.05 billion, which included approximately $7.9 million of accrued and unpaid interest to, but not including, the redemption date and an early redemption premium and unamortized financing costs totaling approximately $43.9 million.
On October 19, 2021, the Company partially placed in-service Reston Next, a Class A office project with
approximately 1.1 million net rentable square feet located in Reston, Virginia.
On October 25, 2021, the Company completed the sale of its 181,191 and 201 Spring Street properties located in Lexington, Massachusetts for an aggregate gross sales price of $191.5 million. 181,191 and 201 Spring Street are 3 Class A office properties aggregating approximately 333,000 net rentable square feet and are 100% leased.
On October 29, 2021, a joint venture in which the three and nine months ended September 30, 2017 and 2016.Company has a 50% interest fully placed in-service 7750 Wisconsin Avenue, a Class A office project with approximately 734,000 net rentable square feet located in Bethesda, Maryland.


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Boston Properties, Inc.
 Three months ended September 30, Nine months ended September 30,
 2017 2016 2017 2016
 (in thousands)
Net income attributable to Boston Properties, Inc. common shareholders$117,337
 $76,753
 $348,086
 $355,114
Add:       
Preferred dividends2,625
 2,589
 7,875
 7,796
Noncontrolling interest—common units of Boston Properties Limited Partnership13,402
 9,387
 40,350
 42,120
Noncontrolling interests in property partnerships14,340
 (17,225) 33,967
 53
Interest expense92,032
 104,641
 282,709
 314,953
Losses from interest rate contracts—
 140
 —
 140
Depreciation and amortization expense152,164
 203,748
 463,288
 516,371
Impairment loss—
 1,783
 —
 1,783
Transaction costs239
 249
 572
 1,187
General and administrative expense25,792
 25,165
 84,319
 79,936
Less:       
Gains on sales of real estate2,891
 12,983
 6,791
 80,606
Gains (losses) from early extinguishments of debt—
 (371) 14,354
 (371)
Gains from investments in securities944
 976
 2,716
 1,713
Interest and other income1,329
 3,628
 3,447
 6,657
Income from unconsolidated joint ventures843
 1,464
 7,035
 5,489
Development and management services revenue10,811
 6,364
 24,648
 18,586
Net Operating Income$401,113
 $382,186
 $1,202,175
 $1,206,773

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Boston Properties Limited Partnership
 Three months ended September 30, Nine months ended September 30,
 2017 2016 2017 2016
 (in thousands)
Net income attributable to Boston Properties Limited Partnership common unitholders$132,693
 $91,306
 $395,199
 $408,540
Add:       
Preferred distributions2,625
 2,589
 7,875
 7,796
Noncontrolling interests in property partnerships14,340
 (17,225) 33,967
 53
Interest expense92,032
 104,641
 282,709
 314,953
Losses from interest rate contracts—
 140
 —
 140
Depreciation and amortization expense150,210
 198,582
 457,102
 507,234
Impairment loss—
 1,783
 —
 1,783
Transaction costs239
 249
 572
 1,187
General and administrative expense25,792
 25,165
 84,319
 79,936
Less:       
Gains on sales of real estate2,891
 12,983
 7,368
 82,775
Gains (losses) from early extinguishments of debt—
 (371) 14,354
 (371)
Gains from investments in securities944
 976
 2,716
 1,713
Interest and other income1,329
 3,628
 3,447
 6,657
Income from unconsolidated joint ventures843
 1,464
 7,035
 5,489
Development and management services revenue10,811
 6,364
 24,648
 18,586
Net Operating Income$401,113
 $382,186
 $1,202,175
 $1,206,773
Net operating income (“NOI”) is a non-GAAP financial measure equal to net income attributable to Boston Properties, Inc. common shareholders and net income attributable to Boston Properties Limited Partnership common unitholders, the most directly comparable GAAP financial measures, plus (1) preferred dividends/distributions, noncontrolling interests, interest expense, losses from interest rate contracts, depreciation and amortization expense, impairment loss, transaction costs and general and administrative expense less (2) gains on sales of real estate, gains (losses) from early extinguishments of debt, gains from investments in securities, interest and other income, income from unconsolidated joint ventures and development and management services revenue. The Company believes NOI is useful to investors as a performance measure and believes it provides useful information to investors regarding its financial condition and results of operations because, when compared across periods, it reflects the impact on operations from trends in occupancy rates, rental rates, operating costs and acquisition and development activity on an unleveraged basis, providing perspective not immediately apparent from net income attributable to Boston Properties, Inc. common shareholders or net income attributable to Boston Properties Limited Partnership common unitholders. For example, interest expense is not necessarily linked to the operating performance of a real estate asset and is often incurred at the corporate level as opposed to the property level. Similarly, interest expense may be incurred at the property level even though the financing proceeds may be used at the corporate level (e.g., for other investment activity). In addition, because of historical cost accounting and useful life estimates, depreciation and amortization may distort operating performance measures at the property level. NOI presented by the Company may not be comparable to NOI reported by other REITs or real estate companies that define NOI differently.
Asset information by segment is not reported because the Company does not use this measure to assess performance. Therefore, depreciation and amortization expense is not allocated among segments. Preferred dividends/distributions, noncontrolling interests, gains on sales of real estate, interest expense, losses from interest rate contracts, gains (losses) from early extinguishments of debt, gains from investments in securities, interest and other income, income from unconsolidated joint ventures, depreciation and amortization expense, impairment loss, transaction costs, general and administrative expenses and development and management services revenue are not included in Net Operating Income as internal reporting addresses these items on a corporate level.

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The Company’s segments are based on the Company’s method of internal reporting which classifies its operations by both geographic area and property type. The Company’s segments by geographic area are Boston, New York, San Francisco and Washington, DC. Segments by property type include: Office, Residential and Hotel.
Information by geographic area and property type (dollars in thousands):
For the three months ended September 30, 2017:
 Boston New York San Francisco Washington, DC Total
Rental Revenue:         
Office$196,687
 $242,071
 $87,162
 $103,622
 $629,542
Residential1,228
 —
 —
 3,067
 4,295
Hotel13,064
 —
 —
 —
 13,064
Total210,979
 242,071
 87,162
 106,689
 646,901
% of Grand Totals32.61% 37.43% 13.47% 16.49% 100.00%
Rental Expenses:         
Office76,086
 95,775
 26,792
 37,111
 235,764
Residential512
 —
 —
 1,065
 1,577
Hotel8,447
 —
 —
 —
 8,447
Total85,045
 95,775
 26,792
 38,176
 245,788
% of Grand Totals34.60% 38.97% 10.90% 15.53% 100.00%
Net operating income$125,934
 $146,296
 $60,370
 $68,513
 $401,113
% of Grand Totals31.40% 36.47% 15.05% 17.08% 100.00%
For the three months ended September 30, 2016:
 Boston New York San Francisco Washington, DC Total
Rental Revenue:         
Office$183,975
 $237,262
 $80,235
 $100,666
 $602,138
Residential1,227
 —
 —
 3,145
 4,372
Hotel12,354
 —
 —
 —
 12,354
Total197,556
 237,262
 80,235
 103,811
 618,864
% of Grand Totals31.92% 38.34% 12.96% 16.78% 100.00%
Rental Expenses:         
Office71,254
 95,073
 26,037
 33,973
 226,337
Residential1,141
 —
 —
 1,082
 2,223
Hotel8,118
 —
 —
 —
 8,118
Total80,513
 95,073
 26,037
 35,055
 236,678
% of Grand Totals34.02% 40.17% 11.00% 14.81% 100.00%
Net operating income$117,043
 $142,189
 $54,198
 $68,756
 $382,186
% of Grand Totals30.62% 37.21% 14.18% 17.99% 100.00%


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For the nine months ended September 30, 2017:
 Boston New York San Francisco Washington, DC Total
Rental Revenue:         
Office$573,883
 $735,485
 $257,286
 $309,225
 $1,875,879
Residential3,520
 —
 —
 8,941
 12,461
Hotel33,859
 —
 —
 —
 33,859
Total611,262
 735,485
 257,286
 318,166
 1,922,199
% of Grand Totals31.80% 38.27% 13.38% 16.55% 100.00%
Rental Expenses:         
Office225,502
 280,569
 77,204
 108,044
 691,319
Residential1,552
 —
 —
 3,211
 4,763
Hotel23,942
 —
 —
 —
 23,942
Total250,996
 280,569
 77,204
 111,255
 720,024
% of Grand Totals34.86% 38.97% 10.72% 15.45% 100.00%
Net operating income$360,266
 $454,916
 $180,082
 $206,911
 $1,202,175
% of Grand Totals29.97% 37.84% 14.98% 17.21% 100.00%
For the nine months ended September 30, 2016:
 Boston New York San Francisco Washington, DC Total
Rental Revenue:         
Office$540,850
 $773,077
 $235,076
 $300,742
 $1,849,745
Residential3,578
 —
 —
 8,931
 12,509
Hotel33,919
 —
 —
 —
 33,919
Total578,347
 773,077
 235,076
 309,673
 1,896,173
% of Grand Totals30.50% 40.77% 12.40% 16.33% 100.00%
Rental Expenses:         
Office210,695
 272,620
 75,412
 101,514
 660,241
Residential2,174
 —
 —
 3,255
 5,429
Hotel23,730
 —
 —
 —
 23,730
Total236,599
 272,620
 75,412
 104,769
 689,400
% of Grand Totals34.32% 39.54% 10.94% 15.20% 100.00%
Net operating income$341,748
 $500,457
 $159,664
 $204,904
 $1,206,773
% of Grand Totals28.32% 41.47% 13.23% 16.98% 100.00%


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ITEM 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations
The following discussion should be read in conjunction with the financial statements and notes thereto appearing elsewhere in this report.
TheseThis Quarterly ReportsReport on Form 10-Q, including the documents incorporated by reference, contains forward-lookingcontain forward-looking statements within the meaning of the federal securities laws, Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. We intend these forward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995 and are including this statement for purposes of complying with those safe harbor provisions.provisions, in each case, to the extent applicable. Such statements are contained principally, but not only, under the captions “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations.” We caution investors that any such forward-looking statements are based on current beliefs or expectations of future events and on assumptions made by, and information currently available to, our management. When used, the words “anticipate,” “believe,” “budget,” “could”, “estimate,” “expect,” “intend,” “may,” “might,” “plan,” “project,” “should,” “will” and similar expressions whichthat do not relate solely to historical matters are intended to identify forward-looking statements. Such statements are subject to risks, uncertainties and assumptions and are not guarantees of future performance or occurrences, which may be affected by known and unknown risks, trends, uncertainties and factors that are, in some cases, beyond our control. Should one or more of these known or unknown risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those anticipated, estimatedexpressed or projectedimplied by the forward-looking statements. We caution you that, while forward-looking statements reflect our good-faith beliefs when we make them, they are not guarantees of future performance or occurrences and are impacted by actual events when they occur after we make such statements. Accordingly, investors should use caution in relying on forward-looking statements, which are based on results and trends at the time they are made, to anticipate future results or trends.
Some of the risks and uncertaintiesThe most significant factors that may cause our actual results performance or achievements to differ materially from those expressed or implied by the forward-looking statements include among others,the ongoing impact of the global COVID-19 pandemic on the U.S. and global economies, which has impacted, and is likely to continue to impact, us, the risks described in (i) our Annual Report on Form 10-K for the fiscal year ended December 31, 2020 including those described under the caption “Risk Factors,” (ii) our subsequent filings under the Exchange Act and (iii) the risk factors set forth in this Form 10-Q in Part II, Item 1A, and the following:
if there is a negative change•the risks and uncertainties related to the impact of the COVID-19 global pandemic, including the duration, scope and severity of the pandemic domestically and internationally; federal, state and local government actions or restrictive measures implemented in response to COVID-19, the economy, including, without limitation, a reversaleffectiveness of such measures, as well as the effect of any relaxation of current job growth trendsrestrictions, and an increase in unemployment, it could have a negative effectthe direct and indirect impact of such measures on our and our tenants’ businesses, financial condition, results of operations, cash flows, liquidity, performance and demand for office space, and the following, among other things:
U.S. and international economy and economic activity generally; the fundamentalsemergence and characteristics of new variants, the speed, effectiveness and distribution of vaccines (including effectiveness against COVID-19 variant strains), whether new or existing actions and measures continue to impact the ability of our business, including overall market occupancy, tenant space utilizationresidential tenants to generate sufficient income to pay, or make them unwilling to pay rent in a timely manner, in full or at all; the health, continued service and rental rates;
the financial conditionavailability of our personnel, including our key personnel and property management teams; and the effectiveness or lack of effectiveness of governmental relief in providing assistance to individuals and large and small businesses, including our tenants, many of which are financial, legal, media/telecommunication, technology and other professional firms, our lenders, counterparties to our derivative financial instruments and institutions that hold our cash balances and short-term investments, which may expose us to increased risks of default by these parties; andhave suffered significant adverse effects from COVID-19;
the value of our real estate assets, which may limit our ability to dispose of assets at attractive prices or obtain or maintain debt financing secured by our properties or on an unsecured basis;
•volatile or adverse global economic and political conditions, health crises and dislocations in the credit markets could adversely affect our access to cost-effective capital and have a resulting material adverse effect on our business opportunities, results of operations and financial condition;
•general risks affecting the real estate industry (including, without limitation, the inability to enter into or renew leases, tenant space utilization, dependence on tenants’ financial condition, and competition from other developers, owners and operators of real estate);
•failure to manage effectively our growth and expansion into new markets and sub-markets or to integrate acquisitions and developments successfully;
•the ability of our joint venture partners to satisfy their obligations;
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•risks and uncertainties affecting property development and construction (including, without limitation, construction delays, increased construction costs, cost overruns, inability to obtain necessary permits, tenant accounting considerations that may result in negotiated lease provisions that limit a tenant’s liability during construction, and public opposition to such activities);
•risks associated with the availability and terms of financing and the use of debt to fund acquisitions and developments and/or refinance existing indebtedness, including the impact of higher interest rates on the cost and/or availability of financing;
•risks associated with forward interest rate contracts and the effectiveness of such arrangements;
•risks associated with downturns in the national and local economies, increases in interest rates, and volatility in the securities markets;
•risks associated with actual or threatened terrorist attacks;
•costs of compliance with the Americans with Disabilities Act and other similar laws;
•potential liability for uninsured losses and environmental contamination;

•risks associated with the physical effects of climate change;
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•risks associated with security breaches through cyber attacks, cyber intrusions or otherwise, as well as other significant disruptions of our information technology (IT) networks and related systems, which support our operations and our buildings;
•risks associated with BXP’s potential failure to qualify as a REIT under the Internal Revenue Code of 1986, as amended;
•possible adverse changes in tax and environmental laws;
•the impact of newly adopted accounting principles on our accounting policies and on period-to-period comparisons of financial results;
•risks associated with possible state and local tax audits;
•risks associated with our dependence on key personnel whose continued service is not guaranteed; and
•the other risk factors identified in our most recently filed Annual ReportsReport on Form 10-K for the fiscal year ended December 31, 2020 or described herein, including those described under the caption “Risk Factors.”

The risks set forth above are not exhaustive. Other sections of this report may include additional factors that could adversely affect our business and financial performance. Moreover, we operate in a very competitive and rapidly changing environment.environment, particularly in light of the circumstances relating to COVID-19. New risk factors emerge from time to time and it is not possible for management to predict all risk factors, nor can we assess the impact of all risk factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements. Given these risks and uncertainties, investors should not place undue reliance on forward-looking statements as a prediction of actual results. Investors should also refer to our most recent Annual ReportsReport on Form 10-K and our Quarterly Reports on Form 10-Q for future periods and Current Reports on Form 8-K as we file them with the SEC, and to other materials we may furnish to the public from time to time through FormsCurrent Reports on Form 8-K or otherwise, for a discussion of risks and uncertainties that may cause actual results, performance or achievements to differ materially from those expressed or implied by forward-looking statements. We expressly disclaim any responsibility to update any forward-looking statements to reflect changes in underlying assumptions or factors, new information, future events, or otherwise, and you should not rely upon these forward-looking statements after the date of this report.
Overview
BXP is a fully integrated, self-administered and self-managed REIT and one of the largest owners, managerspublicly traded office real estate investment trusts (REITs) (based on total market capitalization as of September 30, 2021) in the United States that develops, owns and developers ofmanages primarily Class A office properties. Our properties are concentrated in six markets in the United States.States - Boston, Los Angeles, New York, San Francisco, Seattle and Washington, DC. BPLP is the entity through which BXP conducts substantially all of its business and owns (either directly or through subsidiaries) substantially all of its assets. Our properties are concentrated in five markets - Boston, Los Angeles, New York, San Francisco and Washington, DC. We generate revenue and cash primarily by leasing Class A office space to our tenants. When making leasing decisions, we consider, among other things, the creditworthiness of the tenant and the industry in which it conducts business, the length of
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the lease, the rental rate to be paid at inception and throughout the lease term, the costs of tenant improvements, free rent periods and other landlord concessions, anticipated operating expenses and real estate taxes, current and anticipated vacancy in our properties and the market overall (including sublease space), current and expected future demand for the space, the impact of any expansion rights and general economic factors.
Our core strategy has always been to develop, acquire and operatemanage high-quality properties in supply-constrained markets with high barriers-to-entry and attractive demand drivers, and to focus on executing long-term leases with financially strong tenants. Historically, this combination has tended to reducethese factors have minimized our exposure in downweaker economic cycles and enhanceenhanced revenues as market conditions improve. Our tenant base is diverse across market sectors and the weighted-average lease term for our in-place leases, excluding residential units, was approximately 7.5 years, as of September 30, 2021, including leases signed by our unconsolidated joint ventures. The weighted-average lease term for our 20 largest office tenants was approximately 10.5 years as of September 30, 2021.
To be successful in any leasing environment, we believe we must consider all aspects of the tenant-landlord relationship. In this regard, we believe that our competitive leasing advantage is based on the following attributes:
•our understanding of tenants’ short- and long-term space utilization and amenity needs in the local markets, markets;
•our relationships with local brokers, track record of developing and operating Class A office properties in a sustainable and responsible manner;
•our reputation as a premier developer, owner and operatormanager of primarily Class A office properties, properties;
•our financial strength and our ability to maintain high building standards provide usstandards; and
•our relationships with local brokers.
Outlook
The United States economy continues to recover from the COVID-19 pandemic, although quarter-over-quarter GDP growth slowed to an annual rate of 2.0% in the third quarter of 2021 compared to 6.7% in the second quarter of 2021. This slowdown reflects the impacts of the Delta variant and moderation in government stimulus spending. Since the end of the third quarter, however, daily COVID infection levels have decreased by more than 50% from the recent highs in September 2021. We believe the positive trend in infection rates, combined with relatively low unemployment rates, bodes well for continuing economic growth in our markets.
The overall economic recovery is having a positive impact on our leasing activity. Although additional COVID variants and supply-chain issues may emerge, we believe as the number of vaccinations increases and employees return to their offices in greater numbers, our strategically located, high-quality office properties will remain a vital component of the strategies of today’s forward-thinking organizations that prioritize fostering collaboration, innovation, productivity and culture, and we expect tenants will take advantage of the availability of Class A space and upgrade.
Annual inflation increased to 5.4% in September 2021, driven largely by energy prices, which increased approximately 25% compared to one year ago. Energy is a component of our operating expenses our largest energy cost is electricity. We have limited most of our exposure to additional potential increases through 2022, and we have been increasing our procurement from green power. We remain exposed to the marginal cost of electrical generation in the Boston region where we expect increases in 2022 of greater than 10% compared to last year. Costs for security, cleaning and engineering labor continues to increase due to labor shortages across all trades. However, we are able to mitigate the risks from these increased costs to our results due to the nature of our lease contracts, which generally take one of two forms: (1) net leases, under which all of the operating expense and real estate taxes are paid by the tenant, and (2) gross leases with a competitive advantage.
Outlook
Economic growthbase year that is set upon the lease commencement with increases in expenses over that base year added to the United States continuesrental obligation of the tenant. Our near-term exposure to be tepid yet consistent resultingincreases in operating expenses is primarily on our vacant space and for new or renewal leases where we are setting a slight decrease in the unemployment rate in October 2017 to 4.1%. The Federal Reserve has increased interest rates three times since December 2016 with indicationsbase year. Our vacancy was approximately 11.6% at September 30, 2021, and our 2021 and 2022 lease expirations total approximately 7.6% of more increases to come, yet interest rates remain relatively low by historical standards. Given the pace of GDP growth, low inflation and the uncertainty associated with Federal Reserve fiscal policy and tax reform, weour portfolio. We do not expect a sharpan increase in long-termoperating expenses to have a material adverse effect on our results of operations for the remainder of 2021 or 2022.
BXP Priorities
Despite the concerns surrounding COVID-19 and the lingering impact on economic conditions in our markets, we remain optimistic for our industry generally and our company in particular, given low interest rates, and expect reasonably healthy operating and financial market conditions to continue.

the demand
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for workers across sectors, the high quality of our properties, the supply and demand characteristics of our markets and the success of our development efforts.
In this economic climate, we continue to focus on:We remain focused on the following priorities:
•ensuring tenant health, safety and satisfaction;
•leasing available space in our in-service and development properties, as well as proactively focusing on sizable future lease expirations well in advance;expirations;
•completing the construction of our development and redevelopment properties;
•continuing and completing the redevelopment and repositioning of several key properties to increase future revenuesrevenue and asset values over the long-term, despite the adverse impact on near-term revenue and earnings;long-term;
•identifying new investment opportunities that meet our criteria while maintaining discipline in our underwriting of investment opportunities by (1) seeking significant pre-leasing commitments before beginning new construction, and (2) targeting acquisition activity in non-stabilized assets near innovation centers where we see the best prospects for overall growth and our operational expertise can create value; andunderwriting;
•managing our near-term debt maturities and maintaining our conservative balance sheet.sheet; and
•actively managing our operations in a sustainable and responsible manner.
The following is an overview of portfolio activity, leasing activity and capital markets activity in the third quarter of 2021.
Leasing Activity and Occupancy
In the third quarter of 2021, we signed approximately 1.4 million square feet of new leases and renewals with a weighted-average lease term of approximately 9.2 years, indicating that many new and existing tenants continue to commit to the long-term use of space and view our properties as their preferred choice for a premium Class A office environment. The volume of leasing in the third quarter of 2021 (measured by square feet) was more than double the volume achieved in the first quarter of 2021 and approximately 90% of our pre-pandemic historical third quarter average.
The overall occupancy of our in-service office and retail properties was 88.4% at September 30, 2021, a decrease of 0.2% compared to 88.6% at June 30, 2021. We anticipate occupancy for the remainder of 2021 will be relatively flat with occupancy for the third quarter of 2021, but will begin to improve as we head into 2022, as our remaining 2021 and 2022 lease expirations are backfilled by signed leases that have not yet commenced and new leases.
Our parking and other revenue was approximately $23.5 million in the third quarter of 2021, an increase of approximately $5.2 million from the second quarter of 2021. The increase was primarily due to improved transient parking and greater insurance proceeds from a water main break at a New York property. The third quarter 2021 parking and other revenue was 92% of pre-pandemic parking and other revenue from the third quarter of 2019. We expect to return to pre-pandemic levels of parking revenue as workers increasingly return to work in their offices.
Our hotel property, the Boston Marriott Cambridge, generated approximately $1.2 million of net operating income during the third quarter of 2021. This was the first quarter since the start of the pandemic in which the hotel made a positive contribution to our results. Given the hotel’s location in the heart of Cambridge, Massachusetts and adjacent to MIT, we expect hotel occupancy and REVPAR to improve to pre-pandemic levels over time as business and leisure travel return to historical levels.
Investment Activity
We remain committed to developing and acquiring assets to enhance our long-term growth and to meet tenant demand for high-quality office and lab space. We continually evaluate current and prospective markets for possible acquisitions of “value-add” assets that require lease-up or repositioning, and acquisitions that are otherwise consistent with our long-term strategy of owning, managing, developing and improving, premier Class A properties in each of our chosen markets.
During the third quarter of 2017,2021, we signed leases acrosscontinued to execute on our strategy and completed two acquisitions. We believe these investments align with several elements of our growth strategy, including entering new markets or submarkets that exhibit strong demand and limitations on supply, uncovering opportunities that utilize our leasing and redevelopment skills to increase value, broadening our portfolio totaling approximately 2.6 million square feet, which is higher than our trailing 10-year historical quarterly averageto meet the current and anticipated future
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Table of 1.4 million, and commenced revenue recognition on approximately 1.3 million square feetContents
demand of leases in second-generation space. Of these second-generation leases, approximately 1.0 million square feet had been vacant for less than one year and,tenants in the aggregate, they hadlife sciences sector and employing our Strategic Capital Program (“SCP”) (Refer to the heading “Liquidity and Capital Resources” within “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations” for a slightdescription of the SCP.) to utilize private equity to increase our returns and enhance our investment capacity.These acquisitions included:
•Safeco Plaza, an approximately 765,000 net rentable square-foot Class A office building in net rental obligations ofSeattle, Washington.The property was approximately 2%. The muted increase in net rents was primarily due to two lease renewals in our New York region and one lease renewal in our Washington, DC region. Across our portfolio we continue to experience increases in construction costs, which generally result in increased tenant allowances and costs to build out tenant spaces. However, this quarter’s statistics include several larger renewals with lower tenant allowance costs resulting in total transaction costs per square foot that do not reflect this trend. The overall occupancy of our in-service properties decreased to 90.2%91% leased at September 30, 20172021.This acquisition marked our initial entry into the Seattle market, one of the most vibrant markets in the United States for companies in the technology, life sciences, manufacturing and financial services sectors.The acquisition was completed through a newly formed joint venture with two institutional partners that are part of our SCP.
•Shady Grove Bio+Tech Campus, consisting of seven buildings totaling approximately 435,000 square-feet in the Shady Grove area of Rockville, Maryland, a region that is home to more than 400 companies in the biotechnology and life sciences sector.We plan to convert the office buildings on the campus to lab space to meet current and growing demand in the region from 90.8% at June 30, 2017 due mainly to expected lease expirations at our 399 Park Avenue property.biotechnology companies for new, Class A lab space.
Our investment strategy remains mostly unchanged. Other than possible acquisitions of value-add assets, such as those requiring lease-up or repositioning like Colorado Center in Santa Monica, California, we intend to continue to invest primarily in higher yielding new developments with significant pre-leasing commitments and redevelopment opportunities rather than lower yielding acquisitions of stabilized assets for which demand and pricing remain strong.
Our development activity remains vibrant. DuringIn the third quarter of 2021, we commenced development on two new build-to-suit office headquarterscontinued the construction of the developments and redevelopment projects for Marriott International, Inc. and the Transportation Security Administration (TSA). We expect these office buildings to consistin our pipeline, which consists of an aggregate of approximately 1.4 million square feet andnine properties that, when completed, we expect will total approximately 4.3 million net rentable square feet. As of September 30, 2021, our share of the estimated development costs to total approximately $525 million. In addition, during the third quarter we completed and fully placed in-service 888 Boylston Street, a Class A office and retail project with approximately 417,000 square feet located within our Prudential Center complex in Boston, Massachusetts. Including leases with future commencement dates, the project is 93% leased.
As of September 30, 2017, our development pipeline consists of eleven development/redevelopment projects representing approximately 5.7 million net rentable square feet. Our share of the total budgeted cost for these projects is approximately $3.1$2.7 billion, of which approximately $1.4$1.1 billion of equity remained to be investedinvested. The total development pipeline, inclusive of both office and lab/life sciences developments, but excluding the View Boston Observatory at The Prudential Center, is 72% pre-leased as of September 30, 2017. As of November 2, 2017, approximately 75% of the commercial space in these2021. The office development projects is pre-leased.in our current pipeline, which total approximately 3.3 million square feet, are approximately 87% pre-leased, as of November 2, 2021, to predominately credit-strong tenants with long-lease terms. In addition, during September and October of 2021, we completed and delivered approximately 1.5 million square feet of space to tenants from our development pipeline.
During the third quarter,In early 2021 we further enhanced our liquidity through two secured debt financings aggregating $754.6 million in gross commitments with the $550 million mortgage financing placed on Colorado Center located in Santa Monica, California and a $204.6 million construction commitment collateralized by our Hub on Causeway development project located in Boston, Massachusetts. As a result of the Colorado Center financing the joint venture distributed $502.0 million to the partners, of which our share was $251.0 million. We own a 50% interest in Colorado Center and the Hub on Causeway joint ventures.
Given the relatively low interest rates currently available to us in the debt markets, we may elect to supplement our liquidity position to provide additional capacity to fund our remaining capital requirements for existingadded several new development and redevelopment projects refinance debt before maturity and pursue other attractive investment opportunities. Dependingto our development pipeline focused on the typespecific needs of tenants in the life sciences sector. Our lab/life sciences developments in our pipeline total approximately 920,000 square feet and timing of financing, raising capital may resultinclude properties in us carrying additional cashWaltham, Massachusetts and cash equivalents pendingSouth San Francisco, California. Although Shady Grove Bio+Tech Campus is not currently included in our usedevelopment pipeline, we anticipate converting the office buildings on the campus to lab space. Our lab/life sciences developments are located in some of the proceeds.largest life sciences clusters in the United States, with strong demand from tenants because of the close proximity to universities, research institutions and related businesses and concentrations of labor with specialized skills and knowledge.
The same factorsSupply-chain concerns impact our business both in time to completion and increased costs. Our construction schedule is one of the criteria we use when we evaluate bids for development projects and capital improvements. We have been successful in awarding bids and maintaining schedules through the pandemic. However, there are fewer choices for materials, and we are working closely with our consultants and contractors to ensure there are not items used in the development or redevelopment process that create challengescould impact schedules. We are intentionally minimizing the amount of materials we acquire from overseas, releasing material packages as early as possible and stock-piling materials off-site. In addition, when budgeting new development projects, we are including projected cost increases of approximately 5-6%. We currently expect to acquiring assets present opportunities fordeliver all active developments and redevelopments on time and budget, but we cannot assure you that we will not experience greater cost increases or that the materials we need will continue to be available so that we are able to complete the project. A failure to deliver a project on time could expose us to additional costs under the signed pre-leases for those projects.
As we continue to focus on new investments to drive future growth, we also continually review our portfolio to identify properties as potential sales candidates because they may either no longer fit within our portfolio strategy or they could attract premium pricing in the current market environment. On October 25, 2021, we completed the sale of 181,191 and 201 Spring Street, a three-building complex aggregating approximately 333,000 net rentable square feet in Lexington, Massachusetts, for an aggregate gross sales price of $191.5 million. The three buildings are 100% leased. We expectwill continue to sellevaluate the sale of similar properties.
Excluding Seattle, which we entered on September 1, 2021, a modest number of non-core assets in 2017, subject to market conditions.

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A brief overview of each of our markets follows.
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Boston
The greater Boston region continuesis home to attractthe largest cluster of life sciencesciences companies in the world, and established technologythese companies as well as start-up technologyare growing and maker organizations. The Boston Central Business District (“CBD”) submarket continues to be driven by lease expirations from traditional financialincreasing demand and professional services tenants and a steady flowrents in the region. During the third quarter of new technology companies moving into the CBD. We made significant progress leasing the vacant space at our 200 Clarendon Street property by signing2021, we signed approximately 167,000769,000 square feet of leases duringand approximately 782,000 square feet of leases commenced. Approximately 148,000 square feet of the leases that commenced had been vacant for less than one year and represent an increase in net rental obligations of approximately 17% over the prior leases.
Our Boston central business district (“CBD”) in-service portfolio was approximately 94% leased as of September 30, 2021. During the third quarter of 2021, we executed an approximately 524,000 square foot, 10-year lease extension with Wellington Management at Atlantic Wharf, approximately four years prior to the lease expiration, supporting our belief in the commitment of employers to office space and we have signed a lease for an additional approximately 60,000 square feet during October 2017. Our most active leasing opportunity is at the first phaseattractiveness of our Hub on Causeway development project with negotiations ongoing for approximately 140,000 of the 175,000asset.
In addition, we completed and delivered 440,000 square feet of office space that is not yet leased. We expectleased to complete thean affiliate of Verizon Communications at our 100 Causeway Street development of this phase of the project in 2019.Boston, Massachusetts. 100 Causeway Street is an approximately 632,000 square foot office building in which we have a 50% ownership interest.
The Cambridge office market continues to generate strong rental rates. Our approximately 1.62.0 million square foot in-service office portfolio in Cambridge was approximately 99% leased as of September 30, 2021. During the third quarter of 2021, we continued our development of 325 Main Street at Kendall Center in Cambridge, Massachusetts, which is dominated by large users90% pre-leased to an office tenant for a term of 15 years and we expect to deliver the building into service in 2022. In early 2021, we received approximately one million square feet of new entitlements at Kendall Center for potential future development.
Waltham and the area surrounding the Route 128-Mass Turnpike interchange continue to comprise a popular submarket of Boston for leading and emerging companies in the life sciences, biotechnology and technology sectors. Since the third quarter of 2021, we signed leases for approximately 52,000 square feet at 880 Winter Street, an approximately 224,000 square foot office property in Waltham, Massachusetts that is 100% occupied. Our suburban Waltham/Lexington submarket continuesbeing converted into lab space. We expect to strengthen duedeliver this project in early 2023. We also continued the conversion of 200 West Street in Waltham, Massachusetts into life sciences/lab space and we continued the development of 180 CityPoint, an approximately 329,000 square foot lab development in Waltham, Massachusetts, which is expected to be delivered in 2024. We own or control a significant amount of land in the organic growth of our existing tenant baseBoston region that we expect will enable us to aggressively compete for and othermeet the demand from the emerging and growing tenants in the market looking for space to accommodate their expanding workforces. One example of this is a build-to-suit proposal for 50-60% of our 200,000 square foot CityPoint project. If completed, we would commence construction in early 2018 for delivery in late 2019.these industries.
Los Angeles
Our Los Angeles (“LA”) in-service portfolio of approximately 2.3 million square feet is currently focused in West LA and includes Colorado Center, joint venture asseta 1.1 million square foot property of which we own 50%, and Santa Monica Business Park, a 21-building, approximately 1.2 million square foot property of which we own 55%. As of September 30, 2021, our LA in-service properties were approximately 83% leased. We expect our occupancy to increase later this year upon commencement of an approximately 140,000 square foot lease expansion that was signed in the second quarter of 2021 with a technology company at Santa Monica Business Park in Santa Monica, CaliforniaCalifornia.
New York
As of September 30, 2021, our New York CBD in-service portfolio was approximately 90% leased. During the third quarter of 2021, (1) we signed leases covering approximately 169,000 square feet, including an approximately 39,000 square foot expansion with a financial services company at 399 Park Avenue, increasing their total square footage to approximately 373,000 square feet, and (2) approximately 259,000 square feet of leases commenced. Approximately 200,000 square feet of the leases that commenced had been vacant for less than one year and represent a decrease in net rental obligations of approximately 27% over the prior leases. Excluding approximately 55,000 square feet of short term leases that commenced, the net rental obligations decreased approximately 13% over the prior leases.
In the third quarter of 2021, sublease space continued to be removed from the market and high-quality buildings experienced increased leasing activity. We are actively negotiating approximately 340,000 square feet of leases, of which approximately 200,000 square feet is at Dock 72, our joint venture property in Brooklyn, New York. In October 2021, we signed a 42,000 square foot lease at Dock 72.
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San Francisco
The recovery in San Francisco continues to lag our other markets as fewer businesses have commenced their return to work, street-level retail remains closed or slow and the streets are quiet. As restrictions are lifted, we believe the pace of new leasing activity will begin to increase.
Our San Francisco CBD in-service properties were approximately 93.7%92% leased including leases with future commencement dates, as of September 30, 2017.2021. During the third quarter of 2021, we executed approximately 185,000 square feet of leases, including over 100,000 square feet at Embarcadero Center. We executed four full floor leases at Embarcadero Center at average rental rates of over $100 per square foot. In our first yearaddition, we commenced approximately 91,000 square feet of ownership, our approach to property management, leasing and commitment to invest capital has transformed this once under-leased asset into a top-tier propertyleases in the marketplace. As a result, on July 28, 2017,San Francisco region. Of these leases, approximately 57,000 square feet had been vacant for less than one year and represent an increase in net rental obligations of approximately 9% over the prior leases.
Life sciences activity at our Gateway Commons joint venture in which we haveown an approximately 52% interest continues to be productive. The joint venture has signed a 50% interest, placedletter of intent to lease the entirety of 751 Gateway Commons, a $550.0 million, 10-year mortgage on this previously unencumbered asset. We continue to execute on our repositioning plans and are currently working with local permitting authorities to commence construction on an amenities enhancement229,000 square foot project in late 2017.
We are committed to growing our presence and portfolio in the Los Angeles market and expect to continue to underwrite investment opportunities in this market while maintaining our disciplined investment approach.
New York
Our overall expectations for the midtown Manhattan office market and the leasing activity in our portfolio are generally consistent with recent quarters. New supply continues to come into the market in the form of new deliveries and large lease expirations. As a result, tenants have increasing options, and therefore we do not expect significant growth in office rents in the near-term, and we are experiencing higher tenant concessions. However, we are encouraged, in the third quarter, by continued leasing by tenants of high-end space at rental rates in excess of $100 per square foot. As expected, our New York City portfolio occupancy decreased to 90.0% as of September 30, 2017 from 92.9% as of June 30, 2017 due mainly to lease expirations at 399 Park Avenue. We signed a full-floor lease and have good activity on the remaining space with tours and proposals. We do not expect revenue from replacement tenants to begin prior to 2019.development pipeline.
During the third quarter of 2021, we completed a lease renewal with Aramis (Estee Lauder) at 767 Fifth Avenue (the General Motors Building). Theytwo full-building leases aggregating approximately 58,000 square feet in the Mountain View submarket. We are currentlyexperiencing greater tour activity, including large technology tenant requirements for existing and new products. Due to the limited supply of new, high-quality office space in this submarket, we are evaluating when to restart the first phase of our Platform 16 development project, an approximately 295,0001.1 million aggregate square foot tenant and have committedfuture development next to a minimumDiridon Station in San Jose.
Washington, DC
During the third quarter of 220,0002021, we executed approximately 300,000 square feet with a right to expand. This transaction limits the available spaceof leases and we commenced approximately 163,000 square feet of leases in the buildingWashington, DC region. Of these leases, approximately 96,000 square feet had been vacant for less than one year and represent a decrease in net rental obligations of approximately 22% over the next several years.prior leases.
Our Washington, DC CBD in-service properties were approximately 84% leased, as of September 30, 2021, with modest near-term rollover exposure, and we have reduced our exposure in the Washington, DC CBD market significantly over the past few years through the dispositions of assets.
Our Washington, DC suburban properties include our significant presence in Reston, Virginia, where demand from technology and cybersecurity tenants remains strong. Our Washington, DC suburban properties were approximately 86% leased as of September 30, 2021. During the third quarter of 2021, we completed approximately 70,000 square feet of office leases in Reston and are in negotiations for another 125,000 square feet.
In October, we completed and delivered approximately 285,000 square feet at Reston Next, a Class A office project with approximately 1.1 million net rentable square feet located in Reston, Virginia. This project is 85% pre-leased as of November 2, 2021. In addition, on November 1, 2017,October 29, 2021, a joint venture in which we completedown a long-term lease renewal50% interest, fully placed in-service 7750 Wisconsin Avenue, a Class A office project with Ann Taylor at Times Square Tower for their 2020 lease expiration.approximately 734,000 net rentable square feet located in Bethesda, Maryland.
San Francisco


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Leasing Statistics
The San Francisco CBDtable below details the leasing market remains healthyactivity, including 100% of the unconsolidated joint ventures, that commenced during the three and amongnine months ended September 30, 2021:
Three months ended September 30, 2021Nine months ended September 30, 2021
(Square Feet)
Vacant space available at the beginning of the period5,186,818 4,517,385 
Property dispositions/properties taken out of service (1)— (104,613)
Vacant space in properties acquired (2)143,848 143,848 
Properties placed (and partially placed) in-service (3)503,024 732,454 
Leases expiring or terminated during the period862,505 4,061,176 
Total space available for lease6,696,195 9,350,250 
1st generation leases
585,933 789,489 
2nd generation leases with new tenants
407,240 1,824,259 
2nd generation lease renewals
311,332 1,344,812 
Total space leased (4)1,304,505 3,958,560 
Vacant space available for lease at the end of the period5,391,690 5,391,690 
Leases executed during the period, in square feet (5)1,431,817 3,262,850 
Second generation leasing information: (6)
Leases commencing during the period, in square feet718,572 3,169,071 
Weighted Average Lease Term58 Months81 Months
Weighted Average Free Rent Period124 Days158 Days
Total Transaction Costs Per Square Foot (7)$43.95 $70.21 
Increase (Decrease) in Gross Rents (8)(9.42)%(0.03)%
Increase (Decrease) in Net Rents (9)(14.23)%(0.11)%
__________________
(1)Total square feet of property dispositions during the strongest marketsnine months ended September 30, 2021 consists of 29,595 square feet due to the sale of Annapolis Junction Building Six. Total square feet of properties taken out of service during the nine months ended September 30, 2021 consists of 34,290 square feet at 880 Winter Street and 40,728 square feet at 800 Boylston Street - The Prudential Center, both due to redevelopment.
(2)Total square feet of vacant space in properties acquired during the three and nine months ended September 30, 2021 consists of 69,581 square feet at Safeco Plaza and 74,267 square feet at Shady Grove Bio+Tech Campus.
(3)Total square feet of properties placed (and partially placed) in-service during the three months ended September 30, 2021 consists of 6,709 square feet at 685 Gateway and 496,315 square feet at 100 Causeway Street. Total square feet of properties placed (and partially placed) in-service during the nine months ended September 30, 2021 consists of 195,326 square feet of office and 31,950 square feet of retail at One Five Nine East 53rd Street, 6,709 square feet at 685 Gateway and 498,469 square feet at 100 Causeway Street.
(4)Represents leases for which lease revenue recognition has commenced in accordance with GAAP during the three and nine months ended September 30, 2021.
(5)Represents leases executed during the three and nine months ended September 30, 2021 for which we either (1) commenced lease revenue recognition in such period or (2) will commence lease revenue recognition in subsequent periods, in accordance with GAAP, and includes leases at properties currently under development. The total square feet of leases executed and recognized in the United States. We continue to benefit from this strengththree and nine months ended September 30, 2021 is 320,719 and 734,797, respectively.
(6)Second generation leases are defined as evidencedleases for space that had previously been leased by us. Of the approximately 170,000718,572 and 3,169,071 square feet of second generation leases that commenced during the third quarter of 2017, which have been vacantthree and nine monthsended September 30, 2021, respectively, leases for less than one year397,853 and provide an average increase in net rental obligations of approximately 24.3%.
Our near-term leasing focus remains on the lease up of Salesforce Tower, for which we signed leases totaling approximately 350,0002,439,402 square feet, respectively, were signed in 2017. As of November 2, 2017, Salesforce Tower is 87% leased. We areprior periods.
(7)Total transaction costs include tenant improvements and leasing commissions but exclude free rent concessions and other inducements in lease negotiations for another five floors totaling approximately 152,000 square feet which, if signed, would bring the project to approximately 98% leased and tour activity remains active. We received our temporary certificate of occupancy during the third quarter 2017 and expect the first tenant to occupy this building in January 2018.

accordance with GAAP.
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Washington, DC
Overall market conditions(8)Represents the decrease in gross rent (base rent plus expense reimbursements) on the Washington CBD have not changed in any meaningful way overnew versus expired leases on the past few quarters. Leasing activity remains very competitive primarily because there has been no significant increase in demand, yet supply has increased. Outside of the district, our Reston Town Center properties are approximately 97.3% leased,507,899 and leasing activity is healthy for our available and near-term expiring space.
Our development activities are active as we secured two significant commitments during the third quarter of 2017 aggregating approximately 1.4 million2,219,080 square feet of new build-to-suit projects - Marriott’s worldwide headquarters in Bethesda, Maryland, andsecond generation leases that had been occupied within the new headquarters for the Transportation Security Administration (TSA) in Springfield, Virginia. In addition, we are working to secure anchor tenancies for four tenant requirements totaling approximately 2.1 million square feet, which would support the construction of four additional projects - two in Washington, DC and two in Reston, Virginia.
The table below details the leasing activity during the three and nineprior 12 months ended September 30, 2017:
  Three months ended September 30, 2017 Nine months ended September 30, 2017
  (Square Feet)
Vacant space available at the beginning of the period 3,952,331
 4,196,275
Property dispositions/properties taken out of service —
 (115,289)
Properties acquired vacant space —
 15,944
Properties placed in-service 303,861
 386,599
Leases expiring or terminated during the period 1,523,017
 3,628,613
Total space available for lease 5,779,209
 8,112,142
1st generation leases
 225,125
 302,578
2nd generation leases with new tenants
 624,427
 2,064,896
2nd generation lease renewals
 671,715
 1,486,726
Total space leased (1) 1,521,267
 3,854,200
Vacant space available for lease at the end of the period 4,257,942
 4,257,942
     
Leases executed during the period, in square feet (2) 2,565,971
 4,058,416
     
Second generation leasing information: (3)
    
Leases commencing during the period, in square feet 1,296,142
 3,551,622
Weighted Average Lease Term 93 Months
 95 Months
Weighted Average Free Rent Period 102 Days
 111 Days
Total Transaction Costs Per Square Foot (4) 
$43.66
 
$54.48
Increase in Gross Rents (5) 1.34% 10.44%
Increase in Net Rents (6) 1.54% 15.97%
___________________________
(1)Represents leases for which rental revenue recognition has commenced in accordance with GAAP during the three and nine months ended September 30, 2017.
(2)Represents leases executed during the three and nine months ended September 30, 2017 for which we either (1) commenced rental revenue recognition in such period or (2) will commence rental revenue recognition in subsequent periods, in accordance with GAAP, and includes leases at properties currently under development. The total square feet of leases executed and recognized in the three and nine months ended September 30, 2017 is 263,439 and 673,055, respectively.
(3)Second generation leases are defined as leases for space that had previously been leased by us. Of the 1,296,142 and 3,551,622 square feet of second generation leases that commenced during the three and nine months ended September 30, 2017, respectively, leases for 1,032,703 and 2,878,567 square feet were signed in prior periods.
(4)Total transaction costs include tenant improvements and leasing commissions and exclude free rent concessions and other inducements in accordance with GAAP.
(5)Represents the increase in gross rent (base rent plus expense reimbursements) on the new versus expired leases on the 1,005,495 and 2,641,599 square feet of second generation leases that had been occupied within the prior 12 months

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for the three and nine months ended September 30, 2017,2021, respectively; excludes leases that management considers temporary because the tenant is not expected to occupy the space on a long-term basis.
(6)Represents the increase in net rent (gross rent less operating expenses) on the new versus expired leases on the 1,005,495 and 2,641,599
(9)Represents the decrease in net rent (gross rent less operating expenses) on the new versus expired leases on the 507,899 and 2,219,080 square feet of second generation leases that had been occupied within the prior 12 months for the three and nine months ended September 30, 2017, respectively; excludes leases that management considers temporary because the tenant is not expected to occupy the space on a long-term basis.
Transactions during the three months ended September 30, 20172021, respectively.
Transactions during the threemonths ended September 30, 2021 included the following:
DevelopmentAcquisition/disposition activities
•On August 7, 2017,2, 2021, we entered intoacquired Shady Grove Bio+Tech Campus in Rockville, Maryland, for a joint venture with The Bernstein Companies to developpurchase price, including transaction costs, of approximately $118.5 million in cash. Shady Grove Bio+Tech Campus is an approximately 722,000435,000 net rentable square foot, (subjectseven-building office park situated on an approximately 31-acre site. We intend to adjustment based on finalized building design) build-to-suitreposition three of the buildings, which are currently vacant, to support lab or life sciences uses. As a result, the three vacant buildings are not part of our in-service portfolio. We anticipate that we will redevelop or convert the remaining four buildings to lab or life sciences-related uses as each becomes vacant.
•On July 13, 2021, we entered into an agreement to sell our 181,191 and 201 Spring Street properties located in Lexington, Massachusetts for an aggregate gross sales price of $191.5 million. 181,191 and 201 Spring Street are three Class A office building and below-grade parking garage at 7750 Wisconsin Avenue in Bethesda, Maryland. The joint venture entered into a lease agreement with an affiliate of Marriott International, Inc., under which Marriott will lease 100% of the office building and garage for a term of 20 years, and the building will serve as Marriott’s new worldwide headquarters. Marriott has agreed to fund 100% of the related tenant improvement costs and leasing commissions for the office building. We will serve as co-development manager for the venture and expect to commence construction in 2018. We and The Bernstein Companies each own a 50% interest in the joint venture. (See Notes 4 and 7 to the Consolidated Financial Statements).
On August 24, 2017, we entered into a 15-year lease with the General Services Administration under which we will develop the new headquarters for the TSA. The TSA will occupy 100% of theproperties aggregating approximately 623,000333,000 net rentable square feet of Class A office space and a parking garage at 6595 Springfield Center Drive located in Springfield, Virginia. Concurrently with the execution of the lease, we commenced development of the project and expect the building to be available for occupancy by the fourth quarter of 2020.are 100% leased. The sale was completed on October 25, 2021 (See below).
On September 16, 2017, we completed and fully placed in-service 888 Boylston Street, a Class A office and retail project with approximately 417,000 net rentable square feet located in Boston, Massachusetts. The property is 93% leased.
Acquisition and disposition activities
On August 30, 2017, we completed the sale of our Reston Eastgate property located in Reston, Virginia for a gross sale price of $14.0 million.  Net cash proceeds totaled approximately $13.2 million, resulting in a gain on sale of real estate totaling approximately $2.8 million. Reston Eastgate is a parcel of land containing approximately 21.7 acres located at 11011 Sunset Hills Road.
JointUnconsolidated joint venture activities
•On July 10, 2017, we acquired an additional 0.2% interest in the unconsolidated joint venture that owns Colorado Center located in Santa Monica, California for approximately $2.1 million in cash. Following the acquisition, we own a 50% interest in the joint venture.
Capital markets activities
On July 28, 2017, a joint venture in which we own a 50% interest obtained mortgage financing collateralized by its Colorado Center property located in Santa Monica, California totaling $550.0 million. The mortgage financing bears interest at a fixed rate of 3.56% per annum and matures on August 9, 2027. The loan requires interest-only payments during the 10-year term of the loan, with the entire principal amount due at maturity. The joint venture distributed $502.0 million to the partners, of which our share was $251.0 million. Colorado Center is a six-building office complex that sits on a 15-acre site and contains an aggregate of approximately 1,118,000 net rentable square feet with an underground parking garage for 3,100 vehicles.
On September 6, 2017,31, 2021, a joint venture in which we have a 50% interest obtainedextended the construction financing with a total commitment of $204.6 millionloan collateralized by its The Hub on Causeway development project.– Podium property. At the time of the extension, the outstanding balance of the loan totaled approximately $174.3 million, bore interest at a variable rate equal to LIBOR plus 2.25% per annum and was scheduled to mature on September 6, 2021, with two, one-year extension options, subject to certain conditions. The construction financing bearsextended loan continues to bear interest at a variable rate equal to LIBOR plus 2.25% per annum and matures on September 6, 2021, with two, one-year extension options, subject to certain conditions.  As of September 30, 2017, the venture had not drawn any funds under the loan.2023. The Hub on Causeway - Podium is ana retail and office property with approximately 385,000382,000 net rentable square foot project containing retail and office spacefeet located in Boston, Massachusetts.

•On September 1, 2021, we entered into a joint venture to acquire Safeco Plaza, a Class A office property located in Seattle, Washington, for a gross purchase price of approximately $465.0 million. Safeco Plaza is a 50-story, approximately 765,000 net rentable square-foot, Class A office property. The acquisition was completed through a newly formed joint venture with two institutional partners. Each of the institutional partners invested approximately $71.9 million of cash for its 33.165% ownership interest in the joint venture. We invested approximately $72.6 million for our 33.67% interest in the joint venture and are providing customary operating, property management and leasing services to the joint venture. Our ownership includes (1) a 33.0% direct interest in the joint venture, and (2) an additional 1% interest in each of the two entities (each, a “Safeco Partner Entity”) through which each partner owns its interest in the joint venture. Subject to the occurrence of certain events and the joint venture achieving certain return thresholds, we are entitled to earn promote distributions. Some of the promote distributions may be payable in cash or, at our election, equity interest(s) in the Safeco Partner Entity(ies). The purchase price was funded with cash and proceeds from a new mortgage loan secured by the property. The mortgage loan has a principal amount of $250.0 million, bears interest at a variable rate equal to the greater of (x) 2.35% or (y) LIBOR plus 2.20% per annum and matures on September 1, 2026.
Debt Transaction
•On September 29, 2021, BPLP completed a public offering of $850.0 million in aggregate principal amount of its 2.450% unsecured senior notes due 2033. The notes were priced at 99.959% of the principal amount to yield an effective rate (including financing fees) of approximately 2.524% per annum to maturity. The notes will mature on October 1, 2033, unless earlier redeemed. The aggregate net
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proceeds from the offering were approximately $842.5 million after deducting underwriting discounts and transaction expenses.
There were no transactionsTransactions completed subsequent to September 30, 2017.2021 included the following:
•On October 15, 2021, BPLP used available cash and funds under its unsecured revolving credit agreement (the “2021 Credit Facility”) to complete the redemption of $1.0 billion in aggregate principal amount of its 3.85% senior notes due February 1, 2023. The redemption price was approximately $1.05 billion, which included approximately $7.9 million of accrued and unpaid interest to, but not including, the redemption date and an early redemption premium and unamortized financing costs totaling approximately $43.9 million.
•On October 19, 2021, we partially placed in-service Reston Next, a Class A office project with approximately 1.1 million net rentable square feet located in Reston, Virginia.
•On October 25, 2021, we completed the sale of our 181,191 and 201 Spring Street properties located in Lexington, Massachusetts for an aggregate gross sales price of $191.5 million, as described above under “- Acquisition/disposition activities”.
•On October 29, 2021, a joint venture in which we have a 50% interest fully placed in-service 7750 Wisconsin Avenue, a Class A office project with approximately 734,000 net rentable square feet located in Bethesda, Maryland.
Critical Accounting Policies
Management’s Discussion and Analysis of Financial Condition and Results of Operations discuss our Consolidated Financial Statements, which have been prepared in accordance with generally accepted accounting principles (“GAAP”). The preparation of these financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Certain accounting policies are considered to be critical accounting policies, as they require management to make assumptions about matters that are highly uncertain at the time the estimate is made and changes in accounting estimate are reasonably likely to occur from period to period. Management bases its estimates and assumptions on historical experience and current economic conditions. On an on-going basis, management evaluates its estimates and assumptions including those related to revenue, impairment of long-lived assets and the allowance for doubtful accounts. Actual results may differ from those estimates and assumptions.
Our Annual Report on Form 10-K for the year ended December 31, 20162020 contains a discussion of our critical accounting policies, except for our policies established following the adoption of each of ASU 2016-09 and ASU 2017-01. The adoption of each of ASU 2016-09 and ASU 2017-01 is discussed in Note 2 to our Consolidated Financial Statements.policies. Management discusses and reviews our critical accounting policies and management’s judgments and estimates with BXP’s Audit Committee.
Results of Operations for thethe Nine Months EndedSeptember 30, 20172021 and2016 2020
Net income attributable to Boston Properties, Inc. common shareholdersshareholders and net income attributable to Boston Properties Limited Partnership common unitholders decreased approximately $7.0$542.9 million and $13.3$616.3 million for the nine months ended September 30, 20172021 compared to 2016,2020, respectively, as detailedset forth in the following tables and for the reasons discussed below under the heading “Comparison of the nine months ended September 30, 20172021 to the nine months ended September 30, 2016” 2020”within “Item “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations.Operations.”
Thefollowing are reconciliations of net income attributableNet Income Attributable to Boston Properties, Inc. common shareholders Common Shareholders to net operating incomeNet Operating Income and net income attributableNet Income Attributable to Boston Properties Limited Partnership common unitholdersCommon Unitholders to net operating incomeNet Operating Income for the nine months ended September 30, 20172021 and 20162020 (in thousands):

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Boston Properties, Inc.
 Total Property PortfolioNine months ended September 30,
 2017 2016 Increase/
(Decrease)		 %
Change		20212020Increase/
(Decrease)		%
Change
Net Income Attributable to Boston Properties, Inc. Common Shareholders $348,086
 $355,114
 $(7,028) (1.98)%Net Income Attributable to Boston Properties, Inc. Common Shareholders$311,680 $854,541 $(542,861)(63.53)%
Preferred stock redemption chargePreferred stock redemption charge6,412 — 6,412 100.00 %
Preferred dividends 7,875
 7,796
 79
 1.01 %Preferred dividends2,560 7,875 (5,315)(67.49)%
Net Income Attributable to Boston Properties, Inc. 355,961
 362,910
 (6,949) (1.91)%Net Income Attributable to Boston Properties, Inc.320,652 862,416 (541,764)(62.82)%
Net Income Attributable to Noncontrolling Interests:        Net Income Attributable to Noncontrolling Interests:
Noncontrolling interest—common units of the Operating Partnership 40,350
 42,120
 (1,770) (4.20)%Noncontrolling interest—common units of the Operating Partnership35,393 97,090 (61,697)(63.55)%
Noncontrolling interests in property partnerships 33,967
 53
 33,914
 63,988.68 %Noncontrolling interests in property partnerships52,602 34,280 18,322 53.45 %
Net Income 430,278
 405,083
 25,195
 6.22 %Net Income408,647 993,786 (585,139)(58.88)%
Gains on sales of real estate 6,791
 80,606
 (73,815) (91.58)%
Income Before Gains on Sales of Real Estate 423,487
 324,477
 99,010
 30.51 %
Other Expenses:        Other Expenses:
Add:        Add:
Losses from interest rate contracts
—
 140
 (140) (100.00)%
Interest expense 282,709
 314,953
 (32,244) (10.24)%Interest expense320,015 319,726 289 0.09 %
Losses from early extinguishment of debtLosses from early extinguishment of debt898 — 898 100.00 %
Loss from unconsolidated joint venturesLoss from unconsolidated joint ventures1,745 5,410 (3,665)(67.74)%
Other Income:     

 
Other Income:
Less:        Less:
Gains (losses) from early extinguishments of debt 14,354
 (371) 14,725
 3,969.00 %
Gains from investments in securities 2,716
 1,713
 1,003
 58.55 %Gains from investments in securities3,744 965 2,779 287.98 %
Interest and other income 3,447
 6,657
 (3,210) (48.22)%
Income from unconsolidated joint ventures 7,035
 5,489
 1,546
 28.17 %
Operating Income 678,644
 626,082
 52,562
 8.40 %
Interest and other income (loss)Interest and other income (loss)4,140 4,277 (137)(3.20)%
Gains on sales of real estateGains on sales of real estate8,104 613,723 (605,619)(98.68)%
Other Expenses:        Other Expenses:
Add:        Add:
Depreciation and amortization expense 463,288
 516,371
 (53,083) (10.28)%Depreciation and amortization expense539,815 515,738 24,077 4.67 %
Impairment loss —
 1,783
 (1,783) (100.00)%
Transaction costs 572
 1,187
 (615) (51.81)%Transaction costs2,970 1,254 1,716 136.84 %
Payroll and related costs from management services contractsPayroll and related costs from management services contracts9,166 8,617 549 6.37 %
General and administrative expense 84,319
 79,936
 4,383
 5.48 %General and administrative expense117,924 102,059 15,865 15.54 %
Other Revenue:     

 

Other Revenue:
Less:        Less:
Direct reimbursements of payroll and related costs from management services contractsDirect reimbursements of payroll and related costs from management services contracts9,166 8,617 549 6.37 %
Development and management services revenue 24,648
 18,586
 6,062
 32.62 %Development and management services revenue20,181 23,285 (3,104)(13.33)%
Net Operating Income $1,202,175
 $1,206,773
 $(4,598) (0.38)%Net Operating Income$1,355,845 $1,295,723 $60,122 4.64 %
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Boston Properties Limited Partnership
  Total Property Portfolio
  2017 2016 Increase/
(Decrease)		 %
Change
Net Income Attributable to Boston Properties Limited Partnership Common Unitholders $395,199
 $408,540
 $(13,341) (3.27)%
Preferred distributions 7,875
 7,796
 79
 1.01 %
Net Income Attributable to Boston Properties Limited Partnership 403,074
 416,336
 (13,262) (3.19)%
Net Income Attributable to Noncontrolling Interests:        
Noncontrolling interests in property partnerships 33,967
 53
 33,914
 63,988.68 %
Net Income 437,041
 416,389
 20,652
 4.96 %
Gains on sales of real estate 7,368
 82,775
 (75,407) (91.10)%
Income Before Gains on Sales of Real Estate 429,673
 333,614
 96,059
 28.79 %
Other Expenses:        
Add:        
Losses from interest rate contracts —
 140
 (140) (100.00)%
Interest expense 282,709
 314,953
 (32,244) (10.24)%
Other Income:        
Less:        
Gains (losses) from early extinguishments of debt 14,354
 (371) 14,725
 3,969.00 %
Gains from investments in securities 2,716
 1,713
 1,003
 58.55 %
Interest and other income 3,447
 6,657
 (3,210) (48.22)%
Income from unconsolidated joint ventures 7,035
 5,489
 1,546
 28.17 %
Operating Income 684,830
 635,219

49,611
 7.81 %
Other Expenses:        
Add:        
Depreciation and amortization expense 457,102
 507,234
 (50,132) (9.88)%
Impairment loss —
 1,783
 (1,783) (100.00)%
Transaction costs 572
 1,187
 (615) (51.81)%
General and administrative expense 84,319
 79,936
 4,383
 5.48 %
Other Revenue:        
Less:        
Development and management services revenue 24,648
 18,586
 6,062
 32.62 %
Net Operating Income $1,202,175
 $1,206,773
 $(4,598) (0.38)%

Nine months ended September 30,
20212020Increase/
(Decrease)		%
Change
Net Income Attributable to Boston Properties Limited Partnership Common Unitholders$353,633 $969,932 $(616,299)(63.54)%
Preferred unit redemption charge6,412 — 6,412 100.00 %
Preferred distributions2,560 7,875 (5,315)(67.49)%
Net Income Attributable to Boston Properties Limited Partnership362,605 977,807 (615,202)(62.92)%
Net Income Attributable to Noncontrolling Interests:
Noncontrolling interests in property partnerships52,602 34,280 18,322 53.45 %
Net Income415,207 1,012,087 (596,880)(58.98)%
Other Expenses:
Add:
Interest expense320,015 319,726 289 0.09 %
Losses from early extinguishment of debt898 — 898 100.00 %
Loss from unconsolidated joint ventures1,745 5,410 (3,665)(67.74)%
Other Income:
Less:
Gains from investments in securities3,744 965 2,779 287.98 %
Interest and other income (loss)4,140 4,277 (137)(3.20)%
Gains on sales of real estate8,104 626,686 (618,582)(98.71)%
Other Expenses:
Add:
Depreciation and amortization expense533,255 510,400 22,855 4.48 %
Transaction costs2,970 1,254 1,716 136.84 %
Payroll and related costs from management services contracts9,166 8,617 549 6.37 %
General and administrative expense117,924 102,059 15,865 15.54 %
Other Revenue:
Less:
Direct reimbursements of payroll and related costs from management services contracts9,166 8,617 549 6.37 %
Development and management services revenue20,181 23,285 (3,104)(13.33)%
Net Operating Income$1,355,845 $1,295,723 $60,122 4.64 %
At September 30, 20172021 and September 30, 2016,2020, we owned or had joint venture interests in a portfolio of 177202 and 174196 commercial real estate properties, respectively (in each case, the “Total Property Portfolio”). As a result of changes within our Total Property Portfolio, the financial data presented below shows significant changes in revenue and expenses from period-to-period. Accordingly, we do not believe that our period-to-period financial data with respect to the Total Property Portfolio is necessarily meaningful.provides a complete understanding of our operating results. Therefore, the comparison of operating results for the three and nine months ended September 30, 20172021 and 20162020 show separately the changes attributable to the properties that were owned by us and in-service throughout each period compared (the “Same Property Portfolio”) and the changes attributable to the properties included in the Acquired, Placed In-Service, Acquired, Development or Redevelopment andor Sold Portfolios.
In our analysis of operating results, particularly to make comparisons of net operating income between periods more meaningful, it is important to provide information for properties that were in-service and owned by us throughout each period presented. We refer to properties acquired or placed in-service prior to the beginning of the earliest period presented and owned by us and in-service through the end of the latest period presented as our Same Property Portfolio. The Same Property Portfolio therefore excludes properties acquired, placed in-service acquired or in development or redevelopment after the beginning of the earliest period presented or disposed of prior to the end of the latest period presented.

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Net operating income (“NOI”) is a non-GAAP financial measure equal to net income attributable to Boston Properties, Inc. common shareholders orand net income attributable to Boston Properties Limited Partnership common unitholders, as applicable, the most directly comparable GAAP financial measures, plus (1) preferred stock/unit redemption charge, preferred dividends/distributions, net income attributable to noncontrolling interests, interest expense, losses from interest rate contracts, interest expense,early extinguishment of debt, loss from unconsolidated joint ventures, depreciation and amortization expense, impairment losses, transaction costs, payroll and related costs from management services contracts and corporate general and administrative expense less (2) gains on sales of real estate, gains (losses) from early extinguishments of debt, gains from investments in securities, interest and other income income(loss), gains (losses) on sales of real estate, direct reimbursements of payroll and related costs from unconsolidated joint venturesmanagement services contracts and development and management services revenue. We use NOI internally as a performance measure and believe it provides useful information to investors regarding our financial condition and results of operations and financial condition because, when compared across periods, it reflects the impact on operations from trends in occupancy rates, rental rates, operating costs and acquisition and development activity on an unleveraged basis, providing perspective not immediately apparent from net income attributable to Boston Properties, Inc. common shareholders and net income attributable to Boston Properties Limited Partnership common unitholders. For example, interest expense is not necessarily linked to the operating performance of a real estate asset and is often incurred at the corporate level as opposed to the property level. Similarly, interest expense may be incurred at the property level even though the financing proceeds may be used at the corporate level (e.g., used for other investment activity). In addition, depreciation and amortization expense, because of historical cost accounting and useful life estimates, depreciation and amortization expense may distort operating performance measures at the property level. NOI presented by us may not be comparable to NOI reported by other REITs or real estate companies that define NOI differently.
We believe that, in order to facilitate a clear understanding of our operating results, NOI should be examined in conjunction with net income attributable to Boston Properties, Inc. common shareholders and net income attributable to Boston Properties Limited Partnership common unitholders as presented in our Consolidated Financial Statements. NOI should not be considered as a substitute for net income attributable to Boston Properties, Inc. common shareholders or net income attributable to Boston Properties Limited Partnership common unitholders (determined in accordance with GAAP) or any other GAAP financial measures and should only be considered together with and as a supplement to our financial information prepared in accordance with GAAP.
The gains on sales of real estate, and depreciation expense and impairment losses may differ between BXP and BPLP as a result of previously applied acquisition accounting by BXP for the issuance of common stock in connection with non-sponsor OP Unit redemptions by BPLP. This accounting resulted in a step-up of the real estate assets at BXP that was allocated to certain properties. The difference between the real estate assets of BXP as compared to BPLP for certain properties having an allocation of the real estate step-up will result in a corresponding difference in the gains on sales of real estate, and depreciation expense and impairment losses, when those properties are sold. For additional information see the Explanatory Note that follows the cover page of this Quarterly Report on Form 10-Q.
Comparison of the nine months ended September 30, 20172021 to the nine months ended September 30, 2016.2020
The table below shows selected operating information for the Same Property Portfolio and the Total Property Portfolio. The Same Property Portfolio consists of 144140 properties totaling approximately 38.639.0 million net rentable square feet, of space, excluding unconsolidated joint ventures. The Same Property Portfolio includes properties acquired or fully placed in-service on or prior to January 1, 20162020 and owned and in-servicein service through September 30, 2017.2021. The Total Property Portfolio includes the effects of the other properties either acquired, placed in-service, acquired or in development or redevelopment after January 1, 20162020 or disposed of on or prior to September 30, 2017.2021. This table includes a reconciliation from the Same Property Portfolio to the Total Property Portfolio by also providing information for the nine months ended September 30, 20172021 and 20162020 with respect to the properties that were acquired, placed in-service, acquired, in development or redevelopment or sold.



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 Same Property PortfolioProperties Acquired PortfolioProperties
Placed In-Service
Portfolio		Properties in Development or Redevelopment PortfolioProperties Sold PortfolioTotal Property Portfolio
20212020Increase/
(Decrease)		%
Change		2021202020212020202120202021202020212020Increase/
(Decrease)		%
Change
(dollars in thousands)
Rental Revenue: (1)
Lease Revenue (Excluding Termination Income)$1,969,391 $1,917,628 $51,763 2.70 %$4,617 $297 $31,200 $13,115 $8,928 $14,771 $7,258 $24,067 $2,021,394 $1,969,878 $51,516 2.62 %
Termination Income11,499 8,363 3,136 37.50 %— — — — — — — 59 11,499 8,422 3,077 36.54 %
Lease Revenue1,980,890 1,925,991 54,899 2.85 %4,617 297 31,200 13,115 8,928 14,771 7,258 24,126 2,032,893 1,978,300 54,593 2.76 %
Parking and Other56,398 53,136 3,262 6.14 %488 3 14 16 201 — 1,003 1,150 58,104 54,305 3,799 7.00 %
Total Rental Revenue (1)2,037,288 1,979,127 58,161 2.94 %5,105 300 31,214 13,131 9,129 14,771 8,261 25,276 2,090,997 2,032,605 58,392 2.87 %
Real Estate Operating Expenses728,119 726,296 1,823 0.25 %2,294 443 8,586 5,778 4,414 6,224 2,860 9,289 746,273 748,030 (1,757)(0.23)%
Net Operating Income (Loss), Excluding Residential and Hotel1,309,169 1,252,831 56,338 4.50 %2,811 (143)22,628 7,353 4,715 8,547 5,401 15,987 1,344,724 1,284,575 60,149 4.68 %
Residential Net Operating Income (Loss) (2)14,833 16,809 (1,976)(11.76)%— — (3,101)(717)— — — — 11,732 16,092 (4,360)(27.09)%
Hotel Net Operating Loss (2)(611)(4,944)4,333 87.64 %— — — — — — — — (611)(4,944)4,333 87.64 %
Net Operating Income (Loss)$1,323,391 $1,264,696 $58,695 4.64 %$2,811 $(143)$19,527 $6,636 $4,715 $8,547 $5,401 $15,987 $1,355,845 $1,295,723 $60,122 4.64 %
_______________
(1)Rental Revenue is equal to Revenue less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Revenue per the Consolidated Statements of Operations, excluding the residential and hotel revenue that is noted below. We use Rental Revenue internally as a performance measure and in calculating other non-GAAP financial measures (e.g., NOI), which provides investors with information regarding our performance that is not immediately apparent from the comparable non-GAAP measures and allows investors to compare operating performance between periods.
(2)For a detailed discussion of NOI, including the reasons management believes NOI is useful to investors, see page 59. Residential Net Operating Income for the nine months ended September 30, 2021 and 2020 is comprised of Residential Revenue of $29,832 and $29,076 less Residential Expenses of $18,100 and $12,984, respectively. Hotel Net Operating Loss for the nine months ended September 30, 2021 and 2020 is comprised of Hotel Revenue of $7,382 and $7,014 less Hotel Expenses of $7,993 and $11,958, respectively, per the Consolidated Statements of Operations.
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 Same Property Portfolio 
Properties
Placed In-Service
Portfolio
 Properties
Acquired Portfolio		 
Properties in
Development or
Redevelopment
Portfolio
 Properties Sold Portfolio Total Property Portfolio
(dollars in thousands)2017 2016 
Increase/
(Decrease)
 
%
Change
 2017 2016 2017 2016 2017 2016 2017 2016 2017 2016 
Increase/
(Decrease)
 
%
Change
Rental Revenue:                               
Rental Revenue$1,793,037
 $1,737,375
 $55,662
 3.20 % $50,727
 $30,682
 $5,447
 $2,447
 $3,520
 $17,220
 $846
 $3,231
 $1,853,577
 $1,790,955
 $62,622
 3.50 %
Termination Income23,730
 59,681
 (35,951) (60.24)% —
 —
 —
 —
 (1,428) (892) —
 —
 22,302
 58,789
 (36,487) (62.06)%
Total Rental Revenue1,816,767
 1,797,056
 19,711
 1.10 % 50,727
 30,682
 5,447
 2,447
 2,092
 16,328
 846
 3,231
 1,875,879
 1,849,744
 26,135
 1.41 %
Real Estate Operating Expenses664,110
 641,839
 22,271
 3.47 % 14,640
 7,476
 1,320
 565
 10,560
 8,834
 689
 1,526
 691,319
 660,240
 31,079
 4.71 %
Net Operating Income (Loss), excluding residential and hotel1,152,657
 1,155,217
 (2,560) (0.22)% 36,087
 23,206
 4,127
 1,882
 (8,468)—
7,494
 157
 1,705
 1,184,560
 1,189,504
 (4,944) (0.42)%
Residential Net Operating Income (1)7,691
 7,703
 (12) (0.16)% —
 —
 —
 —
 7
 (623) —
 —
 7,698
 7,080
 618
 8.73 %
Hotel Net Operating Income (1)9,917
 10,189
 (272) (2.67)% —
 —
 —
 —
 —
 —
 —
 —
 9,917
 10,189
 (272) (2.67)%
Net Operating Income (Loss) (1)$1,170,265
 $1,173,109
 $(2,844) (0.24)% $36,087
 $23,206
 $4,127
 $1,882
 $(8,461) $6,871
 $157
 $1,705
 $1,202,175
 $1,206,773
 $(4,598) (0.38)%
_______________  
(1)For a detailed discussion of NOI, including the reasons management believes NOI is useful to investors, see page 50. Residential Net Operating Income for the nine months ended September 30, 2017 and 2016 is comprised of Residential Revenue of $12,461 and $12,509, less Residential Expenses of $4,763 and $5,429, respectively. Hotel Net Operating Income for the nine months ended September 30, 2017 and 2016 is comprised of Hotel Revenue of $33,859 and $33,919 less Hotel Expenses of $23,942 and $23,730, respectively, per the Consolidated Statements of Operations.

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Same Property Portfolio
RentalLease Revenue (Excluding Termination Income)
RentalLease revenue (excluding termination income) from the Same Property Portfolio increased by approximately $55.7$51.8 million for the nine months ended September 30, 20172021 compared to 2016. The2020. Approximately $59.6 million of the increase was related to write-offs of accrued rent and accounts receivable balances that occurred during the nine months ended September 30, 2020 and did not recur in 2021, for primarily retail tenants that either terminated their leases or we determined that the resultaccrued rent and/or accounts receivable balances were no longer probable of an increasecollection. Excluding the write-offs, the Same Property Portfolio decreased by approximately $7.8 million due to average occupancy decreasing from 93.4% to 91.7%, resulting in revenue from our leases and parking and other incomea decrease of approximately $54.0$62.9 million, and $3.2 million, respectively, partially offset by a decreasean increase in other tenant recoveries of approximately $1.5 million. Rental revenue from our leases increased approximately $54.0 million as a result of our average revenue per square foot increasing by approximately $2.02, which contributed$1.08, contributing approximately $54.8 million, partially offset by$55.1 million.
We continue to evaluate the collectability of our accrued rent and accounts receivable balances related to lease revenue. If after a decreasewrite-off has been recorded, (1) we subsequently determine that we are probable we will collect substantially all the remaining lessee’s lease payments under the lease term and (2) the lease has not been modified since the write-off, we will then reinstate the accrued rent and accounts receivable write-offs, adjusting for the amount related to the period when the lease payments were considered not probable of approximately $0.8 million due tocollection. If our estimate of collectability differs from the cash received, then the timing and amount of our reported revenue could be impacted.
Each quarter since the second quarter of 2020, the number of executed COVID-19 lease modifications has decreased and as of the third quarter of 2021, we are executing COVID-19 modifications on a decrease in average occupancy from 91.58% to 91.53%.limited basis.
Termination Income
Termination income decreasedincreased by approximately $36.0$3.1 million for the nine months ended September 30, 20172021 compared to 2016.2020.
Termination income for the nine months ended September 30, 20172021 related to twenty-nine23 tenants across the Same Property Portfolio and totaled approximately $23.7$11.5 million, of which approximately $14.2 million and $5.1 millionwas primarily related to tenants that terminated leases early at 767 Fifth Avenue (the General Motors Building) and 399 Park Avenue, respectively. Both of these buildings are located in New York City. In addition, we receivedCity and the fifth interim distribution from our unsecured creditor's claim against Lehman Brothers, Inc. of approximately $0.4 million (See Note 7 to the Consolidated Financial Statements). Recently, claims of similar priority to that of our remaining claim were quoted privately reflecting a value for our remaining claim of approximately $1.0 million; however, there can be no assurance as to the timing or amount of additional proceeds, if any, that we may receive.Boston region.
Termination income for the nine months ended September 30, 20162020 related to thirty34 tenants across the Same Property Portfolio and totaled approximately $59.7$8.4 million, of which approximately $58.8 million was from our New York region. On February 3, 2016, we entered into a lease termination agreement with a tenant for an approximately 85,000 square foot lease at our 250 West 55th Street property locatedprimarily related to tenants that terminated leases early in New York City.  The lease was scheduled to expire on February 28, 2035.  In consideration
Parking and Other Revenue
Parking and other revenue increased by approximately $3.3 million for the termination of the lease, the tenant paid us approximately $45.0 million. The remaining approximately $12.4 million of termination income from the New York region was primarily related to negotiated early releases with three other tenants. In addition, during the nine months ended September 30, 2016, we received2021 compared to 2020. Parking revenue and other revenue increased by approximately $0.8 million and $2.5 million, respectively. The increase in parking revenue was primarily due to an increase in transient parking. The increase in other revenue was primarily due to approximately $5.1 million in insurance proceeds related to damage at one of our properties in the fourth interim distribution from our unsecured creditor’s claim against Lehman Brothers, Inc.New York region due to a water main break, partially offset by a decrease in other revenue of approximately $1.4$2.6 million (See Note 7related to tenant restoration obligation payments in 2020 that did not recur in 2021. Expenses of $5.1 million related to the Consolidated Financial Statements).insurance claim are included within real estate operating expenses.
We expect to see an increase in parking revenue as the return to office work grows. For the nine months ended September 30, 2021, monthly parking decreased by approximately $4.3 million, offset by an increase in transient parking of approximately $5.6 million, compared to the nine months ended September 30, 2020. Some of our monthly parking revenues are contractual agreements embedded in our leases, and some are at will individual agreements.
Real Estate Operating Expenses
Real estate operating expenses from the Same Property Portfolio increased by approximately $22.3$1.8 million, or 0.3%, for the nine months ended September 30, 20172021 compared to 20162020, due primarily to increasesan increase in utility expense and expenses related to the insurance claim mentioned above, partially offset by a decrease in real estate taxes and othercleaning expenses. The increase in utility expense was experienced across the portfolio and was primarily driven by an increase in physical tenant occupancy, which led to higher demand for electricity and HVAC.
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Properties Acquired Portfolio
The table below lists the properties acquired between January 1, 2020 and September 30, 2021. Rental revenue and real estate operating expenses ofincreased by approximately $15.8$4.8 million or 5.1%, and $6.5$1.9 million, or 1.9%, respectively. The increase in real estate taxesrespectively, for the nine months ended September 30, 2021 compared to 2020, as detailed below.
Square FeetRental RevenueReal Estate Operating Expenses
NameDate acquired20212020Change20212020Change
(dollars in thousands)
777 Harrison Street (1)June 26, 2020N/A$1,509 $300 $1,209 $1,641 $443 $1,198 
153 & 211 Second AvenueJune 2, 2021136,882 3,101 — 3,101 319 — 319 
Shady Grove Bio+Tech CampusAugust 2, 2021233,452 495 — 495 334 — 334 
370,334 $5,105 $300 $4,805 $2,294 $443 $1,851 
_______________
(1)Formerly known as Fourth + Harrison and 425 Fourth Street and includes operating results for 759 Harrison Street, which was primarily experienced in the New York CBD properties.fully acquired on December 16, 2020.
Properties Placed In-Service Portfolio
The table below lists the properties that were placed in-service or partially placed in-service frombetween January 1, 2016 through2020 and September 30, 2017.2021. Rental revenue and real estate operating expenses from our Properties Placed In-Service Portfolio increased by approximately $20.0$19.9 million and $7.2$7.0 million, respectively, for the nine months ended September 30, 20172021 compared to 20162020, as detailed below.

Quarter Initially Placed In-ServiceQuarter Fully Placed In-ServiceRental RevenueReal Estate Operating Expenses
NameSquare Feet20212020Change20212020Change
(dollars in thousands)
Office
20 CityPointSecond Quarter, 2019Second Quarter, 2020211,476 $5,781 $5,485 $296 $2,248 $2,053 $195 
17Fifty Presidents StreetFirst Quarter, 2020First Quarter, 2020275,809 14,833 8,878 5,955 4,292 2,576 1,716 
One Five Nine East 53rd Street (1)First Quarter, 2021First Quarter, 2021220,000 10,600 (1,232)11,832 2,046 1,149 897 
Total Office707,285 31,214 13,131 18,083 8,586 5,778 2,808 
Residential
The SkylyneThird Quarter, 2020Third Quarter, 2020330,996 1,817 23 1,794 4,918 740 4,178 
Total Residential330,996 1,817 23 1,794 4,918 740 4,178 
1,038,281 $33,031 $13,154 $19,877 $13,504 $6,518 $6,986 

_____________
(1)This is the low-rise portion of 601 Lexington Avenue, which was in development for the nine months ended September 30, 2020. Rental revenue for the nine months ended September 30, 2020 includes an approximately $2.9 million write-off of accrued rent and accounts receivable balances for a terminated tenant.
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  Quarter Initially Placed In-Service Quarter Fully Placed In-Service   Rental Revenue Real Estate Operating Expenses
Name   Square Feet 2017 2016 Change 2017 2016 Change
        (dollars in thousands)
601 Massachusetts Avenue Third Quarter, 2015 Second Quarter, 2016 478,818
 $27,716
 $24,938
 $2,778
 $6,871
 $5,568
 $1,303
804 Carnegie Center Second Quarter, 2016 Second Quarter, 2016 130,000
 4,195
 2,576
 1,619
 1,024
 1,066
 (42)
10 CityPoint Second Quarter, 2016 Second Quarter, 2016 241,460
 8,661
 3,002
 5,659
 2,563
 789
 1,774
Reservoir Place North Second Quarter, 2016 Second Quarter, 2017 73,258
 —
 (8) 8
 225
 34
 191
888 Boylston Street Third Quarter, 2016 Third Quarter, 2017 417,000
 10,155
 174
 9,981
 3,957
 19
 3,938
      1,340,536
 $50,727
 $30,682
 $20,045
 $14,640
 $7,476
 $7,164
Properties Acquiredin Development or Redevelopment Portfolio
The table below lists the properties acquiredthat were in development or redevelopment between January 1, 20162020 and September 30, 2017.2021. Rental revenue and real estate operating expenses increasedfrom our Properties in Development or Redevelopment Portfolio decreased by approximately $3.0$5.6 million and $0.8$1.8 million, respectively, for the nine months ended September 30, 20172021 compared to 2016,2020, as detailed below.
Rental RevenueReal Estate Operating Expenses
NameDate Commenced Development / RedevelopmentSquare Feet20212020Change20212020Change
(dollars in thousands)
325 Main Street (1)May 9, 2019115,000 $— $36 $(36)$278 $281 $(3)
200 West Street (2)September 30, 2019261,000 4,900 3,826 1,074 2,168 2,565 (397)
880 Winter Street (3)February 25, 2021224,000 2,476 6,290 (3,814)1,509 2,338 (829)
3625-3635 Peterson Way (4)April 16, 2021218,000 1,753 4,619 (2,866)459 1,040 (581)
818,000 $9,129 $14,771 $(5,642)$4,414 $6,224 $(1,810)
      Rental Revenue Real Estate Operating Expenses
Name Date acquired Square Feet 2017 2016 Change 2017 2016 Change
      (dollars in thousands)
3625-3635 Peterson Way April 22, 2016 218,366
 $4,395
 $2,447
 $1,948
 $876
 $565
 $311
103 Carnegie Center May 15, 2017 96,332
 1,052
 —
 1,052
 444
 —
 444
    314,698
 $5,447
 $2,447
 $3,000
 $1,320
 $565
 $755
_______________
Properties in Development or Redevelopment Portfolio
The table below lists the properties we placed in development or redevelopment between January 1, 2016 and September 30, 2017. Rental revenue decreased by approximately $14.2 million and real(1)Real estate operating expenses increased by approximately $1.7 million, from our Properties in Development or Redevelopment Portfolio for the nine months ended September 30, 2017 compared to 2016, as detailed below.
      Rental Revenue Real Estate Operating Expenses
Name Date commenced development / redevelopment Square Feet 2017 2016 Change 2017 2016 Change
      (dollars in thousands)
One Five Nine East 53rd Street (1) August 19, 2016 220,000
 $1,350
 $10,707
 $(9,357) $6,562
 $6,100
 $462
191 Spring Street (2) December 29, 2016 160,000
 —
 2,652
 (2,652) 2,821
 1,511
 1,310
145 Broadway (3) April 6, 2017 79,616
 742 2,969
 (2,227) 1,177
 1,223
 (46)
    459,616
 $2,092
 $16,328
 $(14,236) $10,560
 $8,834
 $1,726
___________
(1)
This is the low-rise portion of 601 Lexington Avenue in New York City. Rental revenue includes termination income of approximately $(1.4) million and $(0.9) million for the nine months ended September 30, 2017 and 2016, respectively. In addition, real estate operating expense includes demolition costs of approximately $5.4 million and $0.7 million for the nine months ended September 30, 2017 and 2016, respectively.
(2)Real estate operating expenses for the nine months ended September 30, 2017 includes approximately $2.8 million of demolition costs.
(3)On April 6, 2017, we commenced the development of 145 Broadway, a build-to-suit Class A office project with approximately 485,000 net rentable square feet located in Cambridge, Massachusetts. Real estate operating expenses for the nine months ended September 30, 2017 includes approximately $0.8 million of demolition costs.


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In addition, during the nine months ended September 30, 20172021 and 2016, we had approximately $(7,000) and $0.6 million, respectively, of demolition costs2020 were related to demolition costs.
(2)Conversion of a 126,000 square foot portion of the property to life sciences space from office space.
(3)On February 25, 2021, we commenced the redevelopment and conversion of 880 Winter Street, a 224,000 square foot office property located in Waltham, Massachusetts, to laboratory space.
(4)On April 16, 2021, we removed 3625-3635 Peterson Way, located in Santa Clara, California, from our Proto Kendall Square residential development project.in-service portfolio. We are demolishing the building and expect to redevelop the site at a future date.
Properties Sold Portfolio
The table below lists the properties we sold between January 1, 20162020 and September 30, 2017.2021. Rental revenue and real estate operating expenses from our Properties Sold Portfolio decreased by approximately $2.4$17.0 million and $0.8$6.4 million, respectively, for the nine months ended September 30, 20172021 compared to 20162020, as detailed below.
Rental RevenueReal Estate Operating Expenses
NameDate SoldProperty TypeSquare Feet20212020Change20212020Change
(dollars in thousands)
601, 611 and 651 GatewayJanuary 28, 2020Office768,000 $— $1,946 $(1,946)$— $881 $(881)
New Dominion Technology ParkFebruary 20, 2020Office493,000 — 2,551 (2,551)— 772 (772)
Capital Gallery (1)June 25, 2020Office631,000 8,261 20,779 (12,518)2,860 7,636 (4,776)
1,892,000 $8,261 $25,276 $(17,015)$2,860 $9,289 $(6,429)
        Rental Revenue Real Estate Operating Expenses
Name Date Sold Property Type Square Feet 2017 2016 Change 2017 2016 Change
        (dollars in thousands)
415 Main Street February 1, 2016 Office 231,000
 $—
 $1,675
 $(1,675) $—
 $412
 $(412)
30 Shattuck Road April 19, 2017 Land N/A
 —
 —
 —
 14
 35
 (21)
40 Shattuck Road June 13, 2017 Office 122,000
 846 1,556
 (710) 599
 981
 (382)
Reston Eastgate August 30, 2017 Land N/A
 —
 —
 —
 76
 98
 (22)
      353,000
 $846
—
$3,231
—
$(2,385) $689
 $1,526
 $(837)
______________
(1)We completed the sale of a portion of our Capital Gallery property located in Washington, DC. Capital Gallery is an approximately 631,000 net rentable square foot Class A office property. The portion sold was comprised of approximately 455,000 net rentable square feet of commercial office space. We continue to own the land, underground parking garage and remaining commercial office and retail space. The amounts shown represent the entire property and not just the portion sold.
For additional information on the sales of the above properties refer to “Results of Operations—Other Income and Expense Items—Gains on Sales of Real Estate” within “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”
Residential Net Operating Income
Net operating income for our residential same properties decreased by approximately $12,000$2.0 million for the nine months ended September 30, 20172021 compared to 2016.2020. Net operating income for the nine months ended September 30, 2020 includes approximately $0.7 million of termination income from a retail tenant.
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The following reflects our occupancy and rate information for The Lofts at Atlantic Wharf, and The Avant at Reston Town Center, Signature at Reston and Proto Kendall Square for the nine months ended September 30, 20172021 and 2016.2020.

The Lofts at Atlantic WharfThe Avant at Reston Town CenterSignature at RestonProto Kendall Square
20212020Change (%)20212020Change (%)20212020Change (%)20212020Change (%)
Average Monthly Rental Rate (1)$3,459 $4,424 (21.8)%$2,255 $2,381 (5.3)%$2,279 $2,327 (2.1)%$2,577 $2,865 (10.1)%
Average Rental Rate Per Occupied Square Foot$3.89 $4.89 (20.4)%$2.46 $2.61 (5.7)%$2.36 $2.46 (4.1)%$4.73 $5.26 (10.1)%
Average Physical Occupancy (2)93.4 %89.0 %4.9 %94.2 %90.2 %4.4 %86.8 %82.0 %5.9 %92.2 %91.2 %1.1 %
Average Economic Occupancy (3)91.0 %88.9 %2.4 %93.6 %89.2 %4.9 %83.6 %77.3 %8.2 %91.0 %90.0 %1.1 %
_______________  
  The Lofts at Atlantic Wharf The Avant at Reston Town Center
  2017 2016 Percentage
Change		 2017 2016 Percentage
Change
Average Monthly Rental Rate (1) $4,248
 $4,150
 2.4 % $2,391
 $2,375
 0.7 %
Average Rental Rate Per Occupied Square Foot $4.71
 $4.59
 2.6 % $2.63
 $2.61
 0.8 %
Average Physical Occupancy (2) 94.4% 96.3% (2.0)% 93.8% 94.2% (0.4)%
Average Economic Occupancy (3) 95.3% 97.3% (2.1)% 92.9% 94.1% (1.3)%
(1)Average Monthly Rental Rate is calculated as the average of the quotients obtained by dividing (A) rental revenue as determined in accordance with GAAP, by (B) the number of occupied units for each month within the applicable fiscal period.
___________  (2)Average Physical Occupancy is defined as (1) the average number of occupied units divided by (2) the total number of units, expressed as a percentage.
(1)Average Monthly Rental Rate is defined as rental revenue in accordance with GAAP, divided by the weighted monthly average number of occupied units. 
(2)Average Physical Occupancy is defined as (1) the average number of occupied units divided by (2) the total number of units, expressed as a percentage.
(3)Average Economic Occupancy is defined as (1) total possible revenue less vacancy loss divided by (2) total possible revenue, expressed as a percentage. Total possible revenue is determined by valuing average occupied units at contract rates and average vacant units at Market Rents. Vacancy loss is determined by valuing vacant units at current Market Rents. By measuring vacant units at their Market Rents, Average Economic Occupancy takes into account the fact that units of different sizes and locations within a residential property have different economic impacts on a residential property’s total possible gross revenue. Market Rents used by us in calculating Economic Occupancy are based on the current market rates set by the managers of our residential properties based on their experience in renting their residential property’s units and publicly available market data. Trends in market rents for a region as reported by others could vary. Market Rents for a period are based on the average Market Rents during that period and do not reflect any impact for cash concessions.
(3)Average Economic Occupancy is defined as (1) total possible revenue less vacancy loss divided by (2) total possible revenue, expressed as a percentage. Total possible revenue is determined by valuing average occupied units at contract rates and average vacant units at Market Rents. Vacancy loss is determined by valuing vacant units at current Market Rents. By measuring vacant units at their Market Rents, Average Economic Occupancy takes into account the fact that units of different sizes and locations within a residential property have different economic impacts on a residential property’s total possible gross revenue. Market Rents used by us in calculating Economic Occupancy are based on the current market rates set by the managers of our residential properties based on their experience in renting their residential property’s units and publicly available market data. Actual market rents and trends in such rents for a region as reported by others may vary materially from Market Rents used by us. Market Rents for a period are based on the average Market Rents during that period and do not reflect any impact for cash concessions.
Hotel Net Operating IncomeLoss
Net operating income for theThe Boston Marriott Cambridge hotel property decreased byoperated at a loss of approximately $0.3$0.6 million for the nine months ended September 30, 2017 compared to 2016, which was partially due to the hotel undergoing a rooms renovation project on all of its 437 rooms that was completed during2021. This is approximately $4.3 million less than the nine months ended September 30, 2017.2020.
The Boston Marriott Cambridge closed in March 2020 due to COVID-19. The hotel re-opened on October 2, 2020 and has operated at lower occupancy levels due to the continued impact of COVID-19 on business and leisure travel. The closing of the hotel for more than two fiscal quarters, and the lower demand and low occupancy since its re-opening, have had, and are expected to continue to have, a material adverse effect on the hotel’s operations. We expect our hotel occupancy to contribute between $13 millionremain low until the demand for business and $15 millionleisure travel returns to net operating income for 2017 and 2018.

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historical levels.
The following reflects our occupancy and rate information for the Boston Marriott Cambridge hotel for the nine months ended September 30, 20172021 and 2016.2020.
 2017 2016 
Percentage
Change
20212020
Change (%)
Occupancy 81.0% 82.2% (1.5)%Occupancy27.8 %19.8 %40.4 %
Average daily rate $273.96
 $269.10
 1.8 %Average daily rate$192.67 $211.36 (8.8)%
Revenue per available room, REVPAR $221.98
 $221.28
 0.3 %
REVPARREVPAR$53.59 $41.85 28.1 %
Other Operating IncomeRevenue and Expense Items
Development and Management Services Revenue
Development and management services revenue increaseddecreased by an aggregate of approximately $6.1$3.1 million for the nine months ended September 30, 20172021 compared to 2016.2020. Development andservices revenue decreased by approximately $3.8 million while management services revenue increased by approximately $3.6 million$0.7 million. The decrease in development
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services revenue was primarily related to a decrease in development fees earned from a building owned by a third-party in the Washington, DC region and $2.5 million, respectively.an unconsolidated joint venture in New York City and fees associated with tenant improvement projects earned from a third-party owned building in the Washington, DC region. The increase in developmentmanagement services revenue iswas primarily related to an approximately $2.5 million development fee we received as a result of a third-party terminating their development agreement with us. The remaining increase in the development feesleasing commissions earned was from a third-party development agreementowned building in the Boston region and from our New York unconsolidated joint venture that is developing Dock 72 in Brooklyn, New York. Management services revenue increased primarily due to property management fees we earned from our unconsolidated joint venture, that acquired Colorado Center in Santa Monica, California on July 1, 2016, as well as an increase in service income that we earned from our tenants in our New YorkWashington, DC region. We expect our development and management services revenue to contribute between $32 million and $34 million for 2017 and between $29 million and $34 million for 2018.
General and Administrative Expense
General and administrative expense increased by approximately $4.4$15.9 million for the nine months ended September 30, 20172021 compared to 20162020 primarily due to an increase in compensation expense and health care expenses of approximately $17.5 million, partially offset by an approximately $1.6 million decrease in other general and administrative expenses increasing by approximately $3.5 million and $0.9 million, respectively.expenses. The increase in compensation expense was primarily related to (1) an approximately $1.0$2.7 million increase in the value of our deferred compensation plan, (2) an approximately $2.2$13.4 million difference between the unrecognized expense remaining from the 2014 MYLTIP Units compared to the expense that was recognized during the nine months ended September 30, 2017 for the newly issued 2017 MYLTIP Units (See Notes 8 and 11 to the Consolidated Financial Statements) and (3) an increase in other compensation related expenses, ofprimarily due to age-based vesting and (3) an approximately $0.9 million. These increases were partially offset by an$1.4 million increase in capitalized wages of approximately $0.6 million.health care costs. The increase in capitalized wages is shown as a decrease in general and administrative expense as these costs are capitalized and included in real estate assets or deferred charges on our Consolidated Balance Sheets (see below). The increase in other general and administrative expenses was primarily related to the write-off of the remaining fees associated with BXP’s ATM stock offering program that expired on June 3, 2017 and an increasea decrease in other professional fees. We expect our general and administrative expenses to be between $110 million and $115 million for 2017 and between $115 million and $120 million for 2018.
Wages directly related to the development and leasing of rental properties are capitalized and included in real estate assets or deferred charges on our Consolidated Balance Sheets and amortized over the useful lives of the applicable asset or lease term. Capitalized wages for the nine months ended September 30, 20172021 and 20162020 were approximately $13.6$10.1 million and $13.0$9.6 million, respectively. These costs are not included in the general and administrative expenses discussed above.
Transaction Costs
Transaction costs decreasedincreased by approximately $0.6$1.7 million for the nine months ended September 30, 20172021 compared to 2016. This decrease was2020 due primarily related to costs incurred in connection with the acquisitionpursuit and formation of 3625-3635 Peterson Way in Santa Clara, California, which was completed on April 22, 2016, and the acquisition of a 49.8% interest in an existingnew joint venture that owns and operates Colorado Center in Santa Monica, California on July 1, 2016.ventures. In general, transaction costs relaterelating to the formation of new and pending joint ventures pending and completed asset sales and the pursuit of other transactions including acquisitions. However, in January 2017, the FASB issued ASU 2017-01, “Business Combinations (Topic 805): Clarifying the Definition of a Business” (“ASU 2017-01”) and we chose to early adopt it during the first quarter of 2017. We expect that acquisitions of real estate or in-substance real estate will not meet the revised definition of a business andare expensed as such we expect we will no longer be required to expense transaction costs for acquisitions or costs related to the successful acquisition of a property (See Note 2 to the Consolidated Financial Statements).

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Impairment Loss
On September 27, 2016, we executed a letter of intent for the sale of the remaining parcel of land at our Washingtonian North property located in Gaithersburg, Maryland. The letter of intent caused us to reevaluate our strategy for the land and based on a shorter than expected hold period, we reduced the carrying value of the land to the estimated net sales price and recognized an impairment loss of approximately $1.8 million during the nine months ended September 30, 2016.incurred.
Depreciation and Amortization Expense
Depreciation expense may differ between BXP and BPLP as a result of previously applied acquisition accounting by BXP for the issuance of common stock in connection with non-sponsor OP Unit redemptions by BPLP.  This accounting resulted in a step-up of the real estate assets at BXP that was allocated to certain properties.  The difference between the real estate assets of BXP as compared to BPLP for certain properties having an allocation of the real estate step-up will result in a corresponding difference in depreciation expense. For additional information see the Explanatory Note that follows the cover page of this Quarterly Report on Form 10-Q.
Boston Properties, Inc.
Depreciation and amortization expense decreasedincreased by approximately $53.1$24.1 million for the nine months ended September 30, 20172021 compared to 2016,2020, as detailed below.
PortfolioDepreciation and Amortization for the nine months ended September 30,
20212020Change
(in thousands)
Same Property Portfolio (1)$498,208 $498,585 $(377)
Properties Acquired Portfolio4,742 — 4,742 
Properties Placed In-Service Portfolio14,936 5,144 9,792 
Properties in Development or Redevelopment Portfolio (2)20,855 8,397 12,458 
Properties Sold Portfolio1,074 3,612 (2,538)
$539,815 $515,738 $24,077 
_______________
(1)During the nine months ended September 30, 2021, we commenced redevelopment of View Boston Observatory at The Prudential Center, a 59,000 net rentable square foot redevelopment of the top three floors of 800 Boylston Street - The Prudential Center, located in Boston, Massachusetts. As a result, during the nine months ended September 30, 2021, we recorded approximately $2.6 million of accelerated depreciation expense for the demolition of the space, of which approximately $0.8 million related to the step-up of real estate assets.
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  Depreciation and Amortization Expense for the nine months ended September 30,
2017 2016 Change
  (in thousands)
Same Property Portfolio $445,553
 $454,110
 $(8,557)
Properties Placed in-Service Portfolio 10,881
 5,741
 5,140
Properties Acquired Portfolio 3,658
 1,719
 1,939
Properties in Development or Redevelopment Portfolio (1) 2,924
 54,093
 (51,169)
Properties Sold Portfolio 272
 708
 (436)
  $463,288
 $516,371
 $(53,083)
(2)On February 25, 2021, we commenced redevelopment of 880 Winter Street in Waltham, Massachusetts. As a result, during the nine months ended September 30, 2021, we recorded approximately $13.7 million of accelerated depreciation expense for the demolition of a portion of the building.
___________
(1)
On August 19, 2016, the consolidated entity in which we have a 55% interest and that owns 601 Lexington Avenue located in New York City commenced the redevelopment of the six-story, low-rise office and retail building component of the complex. The redeveloped portion of the low-rise building will contain approximately 195,000 net rentable square feet of Class A office space and approximately 25,000 net rentable square feet of retail space. We recorded approximately $50.8 million, including $3.2 million related to the step-up of real estate assets, of accelerated depreciation expense for the portion of the complex demolished.
Boston Properties Limited Partnership
Depreciation and amortization expense decreasedincreased by approximately $50.1$22.9 million for the nine months ended September 30, 20172021 compared to 2016,2020, as detailed below.
PortfolioDepreciation and Amortization for the nine months ended September 30,
20212020Change
(in thousands)
Same Property Portfolio (1)$491,648 $493,247 $(1,599)
Properties Acquired Portfolio4,742 — 4,742 
Properties Placed In-Service Portfolio14,936 5,144 9,792 
Properties in Development or Redevelopment Portfolio (2)20,855 8,397 12,458 
Properties Sold Portfolio1,074 3,612 (2,538)
$533,255 $510,400 $22,855 
  Depreciation and Amortization Expense for the nine months ended September 30,
2017 2016 Change
  (in thousands)
Same Property Portfolio $439,367
 $448,155
 $(8,788)
Properties Placed in-Service Portfolio 10,881
 5,741
 5,140
Properties Acquired Portfolio 3,658
 1,719
 1,939
Properties in Development or Redevelopment Portfolio (1) 2,924
 50,911
 (47,987)
Properties Sold Portfolio 272
 708
 (436)
  $457,102
 $507,234
 $(50,132)
_______________
___________
(1)On August 19, 2016, the consolidated entity in which(1)During the nine months ended September 30, 2021, we have a 55% interest and that owns 601 Lexington Avenue located in New York City commenced the redevelopment of the six-story, low-rise office and retail building component of the complex. The redeveloped portion of the low-rise building will contain approximately 195,000 net rentable square feet of Class A office space and

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approximately 25,000View Boston Observatory at The Prudential Center, a 59,000 net rentable square feetfoot redevelopment of retail space. Wethe top three floors of 800 Boylston Street - The Prudential Center, located in Boston, Massachusetts. As a result, during the nine months ended September 30, 2021, we recorded approximately $47.6$1.8 million of accelerated depreciation expense for the demolition of the space.
(2)On February 25, 2021, we commenced redevelopment of 880 Winter Street in Waltham, Massachusetts. As a result, during the nine months ended September 30, 2021, we recorded approximately $13.7 million of accelerated depreciation expense for the demolition of a portion of the complex demolished.building.
Direct Reimbursements of Payroll and Related Costs From Management Services Contracts and Payroll and Related Costs From Management Service Contracts
We have determined that amounts reimbursed for payroll and related costs received from third parties in connection with management services contracts should be reflected on a gross basis instead of on a net basis as we have determined that we are the principal under these arrangements. We anticipate that these two financial statement line items will generally offset each other.
Other Income and Expense Items
IncomeLoss from Unconsolidated Joint Ventures
Income from unconsolidated joint ventures increased by approximately $1.5 million forFor the nine months ended September 30, 20172021 compared to 20162020, loss from unconsolidated joint ventures decreased by approximately $3.7 million primarily due primarily to an increase in our shareapproximately $10.3 million gain on sale of net incomeinvestment from Colorado Center in Santa Monica, California, which we acquired on July 1, 2016, partially offset by a decrease in our sharethe sale of net income from our Annapolis Junction and 540 Madison Avenue joint ventures. The decrease in our share of net income from our Annapolis Junction joint venture is primarily due to a decrease in occupancy and an increase in interest expense related to Annapolis Junction Building One’s mortgage loan having an event of default and, commencing October 17, 2016, being charged interest at the default interest rate. The decrease in net income from our 540 Madison Avenue joint venture was primarily related to an increase in interest expense as the mortgage loan that encumbers the property bears interest at a variable rate. On July 28, 2017, the joint venture that owns Colorado Center obtained mortgage loan financing, the result of which increased interest expense, which reduced the net income for the joint venture. For additional information pertaining to the Annapolis Junction Building One mortgage loan refer to “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations—Capitalization—Off-Balance Sheet Arrangements—Joint Venture Indebtedness.”
Interest and Other Income
Interest and other income decreased by approximately $3.2 million forduring the nine months ended September 30, 2017 compared to 2016 due primarily to decreases in other income and interest income of approximately $3.0 million and $0.2 million, respectively. During the nine months ended September 30, 2017, the decrease in other income was primarily due to an approximately $1.3 million tax credit that we received from our Washington, DC region and approximately $1.7 million related to the sale of historic tax credits at The Lofts at Atlantic Wharf in Boston, Massachusetts. Both of these items did not recur during 2017.
On October 20, 2010, we closed a transaction with a financial institution (the “HTC Investor”) related to the historic rehabilitation of The Lofts at Atlantic Wharf in Boston, Massachusetts. The HTC Investor has contributed an aggregate of approximately $15 million to the project. As part of its contribution, the HTC Investor received substantially all of the benefits derived from the tax credits. Beginning in July 2012 through July 2016, we recognized the cash received as revenue over the five-year tax credit recapture period as defined in the Internal Revenue Code.
Gains (Losses) from Early Extinguishments of Debt
On June 7, 2017, our consolidated entity in which we have a 60% ownership interest and that owns 767 Fifth Avenue (the General Motors Building) located in New York City completed the refinancing of approximately $1.6 billion of indebtedness that had been secured by direct and indirect interests in 767 Fifth Avenue. The new mortgage financing has a principal amount of $2.3 billion, bears interest at a fixed interest rate of 3.43% per annum and matures on June 9, 2027. The loan requires interest-only payments during the 10-year term of the loan, with the entire principal amount due at maturity. The extinguished debt bore interest at a weighted-average rate of approximately 5.96% per annum, an effective GAAP interest rate of approximately 3.03% per annum and was scheduled to mature on October 7, 2017. There was no prepayment penalty associated with the repayment of the prior indebtedness. We recognized a net gain from early extinguishment of debt totaling approximately $14.6 million primarily consisting of the acceleration of the remaining balance related to the historical fair value debt adjustment.
On April 24, 2017, BPLP entered into the 2017 Credit Facility2021 (See Note 5 to the Consolidated Financial Statements). Certain lenders, under the prior credit facility, chose to not participate in the 2017 Credit Facility and as such we recognized a loss on early extinguishment of debt of approximately $0.3 million related to the acceleration of finance fees associated with the prior credit agreement.
On September 1, 2016, we used a portion of the net proceeds from BPLP’s offering of senior unsecured notes and available cash to repay the mortgage loan collateralized by our 599 Lexington Avenue property located in New York City totaling $750.0 million. The mortgage loan bore interest at a fixed rate of 5.57% per annum (5.41% per annum GAAP interest rate) andThis increase was scheduled to mature on March 1, 2017. There was no prepayment penalty. We recognized a gain from early extinguishment of debt totaling approximately $0.4 million consisting of the acceleration of the remaining balance related to the effective portion of a previous interest rate hedging program included within accumulated other comprehensive loss,partially offset by (1) an approximately $5.8 million gain on sale of real estate from the write-offsale of unamortized deferred financing costs.

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On September 1, 2016, we used a portion of the net proceeds from BPLP’s offering of senior unsecured notesAnnapolis Junction Building Eight and available cash to repay the mortgage loan collateralized by our Embarcadero Center Four property located in San Francisco, California totaling approximately $344.8 million. The mortgage loan bore interest at a fixed rate of 6.10% per annum (7.02% per annum GAAP interest rate) and was scheduled to mature on December 1, 2016. There was no prepayment penalty. We recognized a loss from early extinguishment of debt totaling approximately $0.7 million consisting of the write-off of unamortized deferred financing costs and the acceleration of the remaining balance related to the effective portion of a previous interest rate hedging program included within accumulated other comprehensive loss.
Gains from Investments in Securities
Gains from investments in securities for the nine months ended September 30, 2017 and 2016 related to investments that we have made to reduce our market risk relating to a deferred compensation plan that we maintain for BXP’s officers. Under this deferred compensation plan, each officer who is eligible to participate is permitted to defer a portion of the officer’s current income on a pre-tax basis and receive a tax-deferred return on these deferrals based on the performance of specific investments selected by the officer. In order to reduce our market risk relating to this plan, we typically acquire, in a separate account that is not restricted as to its use, similar or identical investments as those selected by each officer. This enables us to generally match our liabilities to BXP’s officers under the deferred compensation plan with equivalent assets and thereby limit our market risk. The performance of these investments is recorded as gains from investments in securities. During the nine months ended September 30, 2017 and 2016, we recognized gains of approximately $2.7 million and $1.7 million, respectively, on these investments. By comparison, our general and administrative expense increased by approximately $2.7 million and $1.7 milliontwo undeveloped land parcels during the nine months ended September 30, 20172020 and 2016, respectively, as a result of(2) an increaseapproximately $1.1 million decrease in net income from our liability under our deferred compensation plan that were associated with the performance of the specific investments selected by our officers participating in the plan.
Interest Expense
Interest expense decreased by approximately $32.2 million for the nine months ended September 30, 2017 comparedMetropolitan Square joint venture, primarily related to 2016 as detailed below.
Component Change in interest
expense for the nine months ended
September 30, 2017 compared to September 30, 2016
  (in thousands)
Increases to interest expense due to:  
Issuance of $1.0 billion in aggregate principal of 2.750% senior notes due 2026 on August 17, 2016 $20,797
Refinancing of the debt collateralized by 767 Fifth Avenue (the General Motors Building) (1) 10,251
Issuance of $1.0 billion in aggregate principal of 3.650% senior notes due 2026 on January 20, 2016 1,953
Utilization of the Unsecured Line of Credit as well as an increase in capacity due to the execution of the 2017 Credit Facility (1) 1,879
Amortization of deferred financing fees for BPLP’s unsecured debt and credit facility 1,036
Other interest expense (excluding senior notes) 203
Total increases to interest expense 36,119
Decreases to interest expense due to:  
Repayment of mortgage financings (2) (44,900)
Increase in capitalized interest (3) (14,330)
Decrease in the interest for the Outside Members’ Notes Payable for the 767 Fifth Avenue (the General Motors Building) (4) (9,133)
Total decreases to interest expense (68,363)
Total change in interest expense $(32,244)
___________  
(1)See Note 5 to the Consolidated Financial Statements.
(2)Includes the repayment of the mortgage loans collateralized Fountain Square, Embarcadero Center Four and 599 Lexington Avenue.

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(3)
The increase was primarily due to the commencement and continuation of several development projects. For a list of development projects refer to “Liquidity and Capital Resources” within “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”
(4)
The relatedincreased interest expense from the Outside Members’ Notes Payable totaled approximately $16.3 million and $25.4 million for the nine months ended September 30, 2017 and 2016, respectively. These amounts are allocated to the outside joint venture partners as an adjustment to Noncontrolling Interests in Property Partnerships in our Consolidated Statements of Operations. On June 7, 2017, a portion of the outside members’ notes payable was repaid and the remaining portion was contributed as equity in the consolidated entity (See Notes 5 and 8 to the Consolidated Financial Statements).

Interest expense directly related to the development of rental properties is capitalized and included in real estate assets on our Consolidated Balance Sheets and amortized over the useful lives of the real estate or lease term. As portions of properties are placed in-service, we cease capitalizing interest on that portion and interest is then expensed. Interest capitalized for the nine months ended September 30, 2017 and 2016 was approximately $43.3 million and $29.0 million, respectively. These costs are not included in the interest expense referenced above.
We estimate net interest expense, which includes debt extinguishment costs, will be between $355 million to $360 million for 2017 and between $375 million to $390 million for 2018. For both years, these amounts are net of approximately $50 million to $60 million of estimated capitalized interest. In addition, if we refinance, prepay or repurchase existing indebtedness prior to its maturity, we may incur prepayment penalties, realize the acceleration of amortized costs, and our actual interest expense may differ materially from the estimates above.
At September 30, 2017, our variable rate debt consisted of BPLP’s $2.0 billion 2017 Credit Facility, of which no amount was outstanding at September 30, 2017. For a summary of our consolidated debt as of September 30, 2017 and September 30, 2016 refer to the heading “Liquidity and Capital Resources—Capitalization—Debt Financing” within “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”
Losses from Interest Rate Contracts
On August 17, 2016, in conjunction with BPLP’s offering of senior unsecured notes, we terminated forward-starting interest rate swap contracts that fixed the 10-year swap rate at a weighted-average rate of approximately 2.423% per annum on notional amounts aggregating $550.0 million. We cash-settled the contracts and made cash payments to the counterparties aggregating approximately $49.3 million. We recognized approximately $0.1 million of losses on interest rate contracts during the nine months ended September 30, 2016 related to the partial ineffectiveness of the interest rate contracts. We will reclassify into earnings over the 10-year term of the 2.750% senior unsecured notes due 2026 as an increase to interest expense approximately $49.2 million (or approximately $4.9 million per year) of the amounts recorded on our consolidated balance sheets within accumulated other comprehensive loss, which represents the effective portion of the applicable interest rate contracts.mortgage refinancing.
Gains on Sales of Real Estate
The gainsGains on sales of real estate may differ between BXP and BPLP as a result of previously applied acquisition accounting by BXP for the issuance of common stock in connection with non-sponsor OP Unit redemptions by BPLP. This accounting resulted in a step-up of the real estate assets at BXP that was allocated to certain properties. The difference between the real estate assets of BXP as compared to BPLP for certain properties having an allocation of the real estate step-up will result in a corresponding difference in the gains on sales of real estate when those properties are sold. For additional information, see the Explanatory Note that follows the cover page of this Quarterly Report on Form 10-Q.

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Boston Properties, Inc.
Gains on sales of real estate decreased by approximately $73.8$605.6 million for the nine months ended September 30, 20172021 compared to 2016, respectively,2020, as detailed below.
Name Date Sold Property Type Square Feet Sale Price Cash Proceeds Gain on Sale of Real Estate 
        (dollars in millions) 
2017             
30 Shattuck Road April 19, 2017 Land N/A $5.0
 $5.0
 $3.7
 
40 Shattuck Road June 13, 2017 Office 122,000 12.0
 11.9
 —
(1)
Reston Eastgate August 30, 2017 Land N/A 14.0
 13.2
 2.8
 
        $31.0
 $30.1
 $6.5
(2)
2016             
415 Main Street February 1, 2016 Office 231,000 $105.4
 $104.9
 $60.8
 
Broad Run Business Park August 16, 2016 Land N/A 18.0
 17.9
 13.0
 
        $123.4
 $122.8
 $73.8
(3)
NameDate SoldProperty TypeSquare FeetSale PriceNet Cash ProceedsGain (Loss) on Sale of Real Estate
(dollars in millions)
2021
6595 Springfield Center DriveDecember 13, 2018Office634,000 N/AN/A$8.1 (1)
N/AN/A$8.1 
2020
601, 611 and 651 GatewayJanuary 28, 2020Office768,000 $350.0 $— $217.7 
New Dominion Technology ParkFebruary 20, 2020Office493,000 256.0 254.0 192.3 
Capital GalleryJune 25, 2020Office455,000 253.7 246.6 203.6 
$859.7 $500.6 $613.6 (2)
___________
(1)The gain on sale of real estate for this property was $28,000.
(2)Excludes approximately $58,000 and $0.1 million of gains on sale of real estate recognized during the nine months ended September 30, 2017 related to a previously deferred gain amount from 2016 and 2015 sales, respectively.
(3)Excludes approximately $6.8 million of a gain on sale of real estate recognized during the nine months ended September 30, 2016 related to a previously deferred gain amount from the 2014 sale of Patriots Park located in Reston, Virginia.

(1)On December 13, 2018, we sold our 6595 Springfield Center Drive development project located in Springfield, Virginia. Concurrently with the sale, we agreed to act as development manager and guaranteed the completion of the project (See Note 9 to the Consolidated Financial Statements). The development project achieved final completion during the third quarter of 2021 and, upon completion of the project, the total cost of development was determined to be below the estimated total investment at the time of sale. As a result, we recognized a gain of approximately $8.1 million.
(2)Excludes approximately $0.1 million of gains on sales of real estate recognized during the nine months ended September 30, 2020 related to gain amounts from sales of real estate occurring in the prior year.
Boston Properties Limited Partnership
Gains on sales of real estate decreased by approximately $75.4$618.6 million for the nine months ended September 30, 20172021 compared to 2016, respectively,2020, as detailed below.
Name Date Sold Property Type Square Feet Sale Price Cash Proceeds Gain on Sale of Real Estate 
        (dollars in millions) 
2017             
30 Shattuck Road April 19, 2017 Land N/A $5.0
 $5.0
 $3.7
 
40 Shattuck Road June 13, 2017 Office 122,000 12.0
 11.9
 0.6
 
Reston Eastgate August 30, 2017 Land N/A 14.0
 13.2
 2.8
 
        $31.0
 $30.1
 $7.1
(1)
2016             
415 Main Street February 1, 2016 Office 231,000 $105.4
 $104.9
 $63.0
 
Broad Run Business Park August 16, 2016 Land N/A 18.0
 17.9
 13.0
 
        $123.4
 $122.8
 $76.0
(2)
NameDate SoldProperty TypeSquare FeetSale PriceNet Cash ProceedsGain (Loss) on Sale of Real Estate
(dollars in millions)
2021
6595 Springfield Center DriveDecember 13, 2018Office634,000 N/AN/A$8.1 (1)
N/AN/A$8.1 
2020
601, 611 and 651 GatewayJanuary 28, 2020Office768,000 $350.0 $— $222.4 
New Dominion Technology ParkFebruary 20, 2020Office493,000 256.0 254.0 197.1 
Capital GalleryJune 25, 2020Office455,000 253.7 246.6 207 
$859.7 $500.6 $626.5 (2)
___________
(1)Excludes approximately $58,000 and $0.1 million of gains on
(1)On December 13, 2018, we sold our 6595 Springfield Center Drive development project located in Springfield, Virginia. Concurrently with the sale, we agreed to act as development manager and guaranteed the completion of the project (See Note 9 to the Consolidated Financial Statements). The development project achieved final completion during the third quarter of 2021 and, upon completion of the project, the total cost of development was determined to be below the estimated total investment at the time of sale. As a result, we recognized a gain of approximately $8.1 million.
(2)Excludes approximately $0.2 million of gains on sales of real estate recognized during the nine months ended September 30, 2020 related to gain amounts from sales of real estate occurring in the prior year.
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Interest and Other Income (Loss)
Interest and other income (loss) decreased by approximately $0.1 million for the nine months ended September 30, 2021 compared to 2020, due primarily to a decrease of approximately $2.9 million in interest income as a result of lower interest earned on our deposits, partially offset by an approximately $2.8 million decrease in the allowance for current expected credit losses, which results in higher income.
On January 1, 2020, we adopted Accounting Standards Update (“ASU”) 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”) and, as a result, we were required to record an allowance for current expected credit losses related to our outstanding (1) related party note receivable, (2) notes receivable and (3) off-balance sheet credit exposures.
Gains from Investments in Securities
Gains from investments in securities for the nine months ended September 30, 2021 and 2020 related to investments that we have made to reduce our market risk relating to deferred compensation plans that we maintain for BXP’s officers and former non-employee directors. Under the deferred compensation plans, each officer or non-employee director who is eligible to participate is permitted to defer a portion of the officer’s current income or the non-employee director’s compensation on a pre-tax basis and receive a tax-deferred return on these deferrals based on the performance of specific investments selected by the officer or non-employee director. In order to reduce our market risk relating to these plans, we typically acquire, in a separate account that is not restricted as to its use, similar or identical investments as those selected by each officer or non-employee director. This enables us to generally match our liabilities to BXP’s officers or former non-employee directors under our deferred compensation plans with equivalent assets and thereby limit our market risk. The performance of these investments is recorded as gains from investments in securities. During the nine months ended September 30, 2021 and 2020, we recognized gains of approximately $3.7 million and $1.0 million, respectively, on these investments. By comparison, our general and administrative expense increased by approximately $3.7 million and $1.0 million during the nine months ended September 30, 2021 and 2020, respectively, as a result of increases in our liability under our deferred compensation plans that was associated with the performance of the specific investments selected by officers and former non-employee directors of BXP participating in the plans.
Losses From Early Extinguishment of Debt
On February 14, 2021, BPLP completed the redemption of $850.0 million in aggregate principal amount of its 4.125% senior notes due May 15, 2021. The redemption price was approximately $858.7 million, which was equal to the stated principal plus approximately $8.7 million of accrued and unpaid interest to, but not including, the redemption date. Excluding the accrued and unpaid interest, the redemption price was equal to the principal amount being redeemed. We recognized a loss from early extinguishment of debt totaling approximately $0.4 million related to unamortized origination costs.
On March 16, 2021, BPLP repaid $500.0 million, representing all amounts outstanding on its delayed draw term loan (“Delayed Draw Facility”) under our prior unsecured revolving credit agreement (the “2017 Credit Facility”). We recognized a loss from early extinguishment of debt totaling approximately $0.5 million related to unamortized financing costs.
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Interest Expense
Interest expense increased by approximately $0.3 million for the nine months ended September 30, 2021 compared to 2020, as detailed below.
ComponentChange in interest expense for the nine months ended September 30, 2017 related2021 compared to a previously deferred gain amount from 2016 and 2015 sales, respectively.September 30, 2020
(in thousands)
Increases to interest expense due to:
(2)Issuance of $1.25 billion in aggregate principal of 3.250% senior notes due 2031 on May 5, 2020Excludes approximately $6.8$14,155 
Issuance of $850 million in aggregate principal of a gain2.550% senior notes due 2032 on sale of real estate recognized during the nine months ended September 30, 2016March 16, 202111,897 
Decrease in capitalized interest related to a previously deferred gain amount fromdevelopment projects3,645 
Increase in interest due to finance leases for two in-service properties1,604 
Increase in interest due to finance leases that are related to development properties1,052 
Issuance of $850 million in aggregate principal of 2.450% senior notes due 2033 on September 29, 2021116 
Total increases to interest expense32,469 
Decreases to interest expense due to:
Redemption of $850 million in aggregate principal of 4.125% senior notes due 2021 on February 14, 2021(22,550)
Decrease in interest rates for the 2014 sale2017 and 2021 Credit Facilities and the repayment of Patriots Park locatedthe unsecured term loan on March 16, 2021 (1)(5,196)
Increase in Reston, Virginia.capitalized interest related to development projects that had finance leases(3,645)
Other interest expense (excluding senior notes)(658)
Decrease in interest related to the repayment of the University Place mortgage loan(131)
Total decreases to interest expense(32,180)
Total change in interest expense$289 

_______________

(1)On June 15, 2021, BPLP entered into the 2021 Credit Facility, which replaced the 2017 Credit Facility (See Note 8 to the Consolidated Financial Statements).
Interest expense directly related to the development of rental properties is capitalized and included in real estate assets on our Consolidated Balance Sheets and amortized over the useful lives of the real estate or lease term. As portions of properties are placed in-service, we cease capitalizing interest on that portion and interest is then expensed. Interest capitalized for the nine months ended September 30, 2021 and 2020 was approximately $36.6 million and $41.3 million, respectively. These costs are not included in the interest expense referenced above.
On October 15, 2021, BPLP used available cash and funds under its 2021 Credit Facility to complete the redemption of $1.0 billion in aggregate principal amount of its 3.85% senior notes due February 1, 2023. The redemption price was approximately $1.05 billion, which was equal to par plus approximately $7.9 million of accrued and unpaid interest to, but not including, the redemption date and an early redemption premium and unamortized financing costs totaling approximately $43.9 million. We expect to recognize a loss from early extinguishment of debt related primarily to the payment of the redemption premium in the fourth quarter.
At September 30, 2021, our variable rate debt consisted of BPLP’s $1.5 billion revolving facility (the “Revolving Facility”). The Revolving Facility did not have an outstanding balance as of September 30, 2021. For a summary of our consolidated debt as of September 30, 2021 and September 30, 2020 refer to the heading “Liquidity and Capital Resources—Capitalization—Debt Financing” within “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”
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Noncontrolling interestsInterests in property partnershipsProperty Partnerships
Noncontrolling interests in property partnerships increased by approximately $33.9$18.3 million for the nine months ended September 30, 20172021 compared to 20162020, as detailed below.
Property Noncontrolling Interests in Property Partnerships for the nine months ended September 30,
2017 2016 Change
  (in thousands)
Salesforce Tower $(355) $(3) $(352)
767 Fifth Avenue (the General Motors Building) (1) (1,779) (15,477) 13,698
Times Square Tower 20,002
 20,110
 (108)
601 Lexington Avenue (2) 6,597
 (14,221) 20,818
100 Federal Street 2,483
 2,683
 (200)
Atlantic Wharf Office 7,019
 6,961
 58
  $33,967
 $53
 $33,914
PropertyNoncontrolling Interests in Property Partnerships for the nine months ended September 30,
20212020Change
(in thousands)
767 Fifth Avenue (the General Motors Building) (1)$8,873 $4,205 $4,668 
Times Square Tower (2)14,915 198 14,717 
601 Lexington Avenue (3)11,245 12,317 (1,072)
100 Federal Street10,211 10,874 (663)
Atlantic Wharf Office Building7,358 6,686 672 
$52,602 $34,280 $18,322 
__________________________
(1)
On June 7, 2017, our consolidated entity in which we have a 60% interest completed the refinancing of indebtedness that had been secured by direct and indirect interests in 767 Fifth Avenue. Prior to this quarter, the net loss allocation was primarily due to the partners’ share of the interest expense for the outside members’ notes payable which was $16.3 million and $25.4 million for the nine months ended September 30, 2017 and 2016, respectively. On June 7, 2017, a portion of the outside members’ notes payable was repaid and the remaining portion was contributed as equity in the consolidated entity (See Notes 5 and 8 to the Consolidated Financial Statements).
(1)The increase was primarily attributable to an increase in lease revenue from our tenants. In addition, during the nine months ended September 30, 2020, we accelerated amortization expense related to a below-market lease that terminated early.
(2)During the nine months ended September 30, 2020, we wrote off approximately $26.8 million of accrued rent and accounts receivable balances for tenants that either terminated their leases or for which we determined their accrued rent and/or accounts receivable balances, primarily retail tenants, were no longer probable of collection. Approximately $12.0 million represents our partners’ share of the write-offs.
(3)The decrease was primarily due to a decrease in lease revenue from our retail tenants and a tenant that terminated its space during the nine months ended September 30, 2020, partially offset by the increase in revenue related to placing in-service One Five Nine East 53rd Street. During the nine months ended September 30, 2020, we wrote off approximately $2.9 million of accrued rent and accounts receivable balances for tenants that either terminated their leases or for which we determined their accrued rent and/or accounts receivable balances, primarily retail tenants, were no longer probable of collection. Approximately $1.3 million represents our partners’ share of the write-offs.
(2)On August 19, 2016, the consolidated entity in which we have a 55% interest and that owns this property commenced the redevelopment of the six-story low-rise office and retail building component of the complex. The redeveloped portion of the low-rise building will contain approximately 195,000 net rentable square feet of Class A office space and approximately 25,000 net rentable square feet of retail space. We will capitalize incremental costs during the redevelopment. BXP and BPLP recognized approximately $50.8 million and $47.6 million, respectively, of depreciation expense associated with the acceleration of depreciation on the assets being removed from service and demolished as part of the redevelopment of the property. Approximately $21.4 million of those amounts was allocated to the outside partners.
Noncontrolling interest - Interest—Common Units of the Operating Partnership
For BXP, noncontrolling interest–interest—common units of the Operating Partnership decreased by approximately $1.8$61.7 million for the nine months ended September 30, 20172021 compared to 20162020 due primarily to decreasesa decrease in allocable income, and inwhich was the noncontrolling interest’s ownership percentage.result of recognizing a greater gain on sales of real estate amount during 2020. Due to our UPREIT ownership structure, there is no corresponding line item on BPLP’s financial statements.
Results of Operations for the Three Months Ended September 30, 20172021 and 20162020
Net income attributable to Boston Properties, Inc. common shareholders and net income attributable to Boston Properties Limited Partnership common unitholders increased approximately $40.6$18.4 million and $41.4$20.4 million for the three months ended September 30, 20172021 compared to 2016,2020, respectively, as detailed in the following tables and for the reasons discussed below under the heading “Comparison of the three months ended September 30, 20172021 to the three months ended September 30, 2016”2020” within “Item“Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations.Operations.”
Below are reconciliations of net income attributable to Boston Properties, Inc. common shareholders to NOI and net income attributable to Boston Properties Limited Partnership common unitholders to NOI for the three months ended September 30, 20172021 and 2016.2020. For a detailed discussion of NOI, including the reasons management believes NOI is useful to investors, see page 50.



59.
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Boston Properties, Inc.
  Total Property Portfolio
  2017 2016 Increase/
(Decrease)		 %
Change
  (in thousands)
Net Income Attributable to Boston Properties, Inc. Common Shareholders $117,337
 $76,753
 $40,584
 52.88 %
Preferred dividends 2,625
 2,589
 36
 1.39 %
Net Income Attributable to Boston Properties, Inc. 119,962
 79,342
 40,620
 51.20 %
Net Income Attributable to Noncontrolling Interests:        
Noncontrolling interest—common units of Boston Properties Limited Partnership 13,402
 9,387
 4,015
 42.77 %
Noncontrolling interests in property partnerships 14,340
 (17,225) 31,565
 183.25 %
Net Income 147,704
 71,504
 76,200
 106.57 %
Gains on sales of real estate 2,891
 12,983
 (10,092) (77.73)%
Income Before Gains on Sales of Real Estate 144,813
 58,521
 86,292
 147.45 %
Other Expenses:        
Add:        
Losses from interest rate contracts —
 140
 (140) (100.00)%
Losses from early extinguishments of debt —
 371
 (371) (100.00)%
Interest expense 92,032
 104,641
 (12,609) (12.05)%
Other Income:        
Less:        
Gains from investments in securities 944
 976
 (32) (3.28)%
Interest and other income 1,329
 3,628
 (2,299) (63.37)%
Income from unconsolidated joint ventures 843
 1,464
 (621) (42.42)%
Operating Income 233,729
 157,605
 76,124
 48.30 %
Other Expenses:        
Add:        
Depreciation and amortization expense 152,164
 203,748
 (51,584) (25.32)%
Impairment loss —
 1,783
 (1,783) (100.00)%
Transaction costs 239
 249
 (10) (4.02)%
General and administrative expense 25,792
 25,165
 627
 2.49 %
Other Revenue:        
Less:        
Development and management services revenue 10,811
 6,364
 4,447
 69.88 %
Net Operating Income $401,113
 $382,186
 $18,927
 4.95 %




Three months ended September 30,
20212020Increase/
(Decrease)		%
Change
(in thousands)
Net Income Attributable to Boston Properties, Inc. Common Shareholders$108,297 $89,854 $18,443 20.53 %
Preferred dividends— 2,625 (2,625)(100.00)%
Net Income Attributable to Boston Properties, Inc.108,297 92,479 15,818 17.10 %
Net Income Attributable to Noncontrolling Interests:
Noncontrolling interest—common units of the Operating Partnership11,982 10,020 1,962 19.58 %
Noncontrolling interests in property partnerships18,971 15,561 3,410 21.91 %
Net Income139,250 118,060 21,190 17.95 %
Other Expenses:
Add:
Interest expense105,794 110,993 (5,199)(4.68)%
Loss from unconsolidated joint ventures5,597 6,873 (1,276)(18.57)%
Other Income:
Less:
Gains (losses) from investments in securities(190)1,858 (2,048)(110.23)%
Interest and other income (loss)1,520 (45)1,565 3,477.78 %
Gains (losses) on sales of real estate348 (209)557 266.51 %
Other Expenses:
Add:
Depreciation and amortization expense179,412 166,456 12,956 7.78 %
Transaction costs1,888 307 1,581 514.98 %
Payroll and related costs from management services contracts3,006 2,896 110 3.80 %
General and administrative expense34,560 27,862 6,698 24.04 %
Other Revenue:
Less:
Direct reimbursements of payroll and related costs from management services contracts3,006 2,896 110 3.80 %
Development and management services revenue6,094 7,281 (1,187)(16.30)%
Net Operating Income$458,729 $421,666 $37,063 8.79 %
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Boston Properties Limited Partnership
Three months ended September 30,
20212020Increase/
(Decrease)		%
Change
(in thousands)
Net Income Attributable to Boston Properties Limited Partnership Common Unitholders$122,014 $101,624 $20,390 20.06 %
Preferred distributions— 2,625 (2,625)(100.00)%
Net Income Attributable to Boston Properties Limited Partnership122,014 104,249 17,765 17.04 %
Net Income Attributable to Noncontrolling Interests:
Noncontrolling interests in property partnerships18,971 15,561 3,410 21.91 %
Net Income140,985 119,810 21,175 17.67 %
Other Expenses:
Add:
Interest expense105,794 110,993 (5,199)(4.68)%
Loss from unconsolidated joint ventures5,597 6,873 (1,276)(18.57)%
Other Income:
Less:
Gains (losses) from investments in securities(190)1,858 (2,048)(110.23)%
Interest and other income (loss)1,520 (45)1,565 3,477.78 %
Gains (losses) on sales of real estate348 (209)557 266.51 %
Other Expenses:
Add:
Depreciation and amortization expense177,677 164,706 12,971 7.88 %
Transaction costs1,888 307 1,581 514.98 %
Payroll and related costs from management services contracts3,006 2,896 110 3.80 %
General and administrative expense34,560 27,862 6,698 24.04 %
Other Revenue:
Less:
Direct reimbursements of payroll and related costs from management services contracts3,006 2,896 110 3.80 %
Development and management services revenue6,094 7,281 (1,187)(16.30)%
Net Operating Income$458,729 $421,666 $37,063 8.79 %
  Total Property Portfolio
  2017 2016 Increase/
(Decrease)		 %
Change
  (in thousands)
Net Income Attributable to Boston Properties Limited Partnership Common Unitholders $132,693
 $91,306
 $41,387
 45.33 %
Preferred distributions 2,625
 2,589
 36
 1.39 %
Net Income Attributable to Boston Properties Limited Partnership 135,318
 93,895
 41,423
 44.12 %
Net Income Attributable to Noncontrolling Interests:        
Noncontrolling interests in property partnerships 14,340
 (17,225) 31,565
 183.25 %
Net Income 149,658
 76,670
 72,988
 95.20 %
Gains on sales of real estate 2,891
 12,983
 (10,092) (77.73)%
Income Before Gains on Sales of Real Estate 146,767
 63,687
 83,080
 130.45 %
Other Expenses:        
Add:        
Losses from interest rate contracts —
 140
 (140) (100.00)%
Losses from early extinguishments of debt —
 371
 (371) (100.00)%
Interest expense 92,032
 104,641
 (12,609) (12.05)%
Other Income:        
Less:        
Gains from investments in securities 944
 976
 (32) (3.28)%
Interest and other income 1,329
 3,628
 (2,299) (63.37)%
Income from unconsolidated joint ventures 843
 1,464
 (621) (42.42)%
Operating Income 235,683
 162,771
 72,912
 44.79 %
Other Expenses:        
Add:        
Depreciation and amortization expense 150,210
 198,582
 (48,372) (24.36)%
Impairment loss —
 1,783
 (1,783) (100.00)%
Transaction costs 239
 249
 (10) (4.02)%
General and administrative expense 25,792
 25,165
 627
 2.49 %
Other Revenue:        
Less:        
Development and management services revenue 10,811
 6,364
 4,447
 69.88 %
Net Operating Income $401,113
 $382,186
 $18,927
 4.95 %


Comparison of the three months ended September 30, 20172021 to the three months ended September 30, 2016.2020
The table below shows selected operating information for the Same Property Portfolio and the Total Property Portfolio. The Same Property Portfolio consists of 148143 properties totaling approximately 39.7 million net rentable square feet, of space, excluding unconsolidated joint ventures. The Same Property Portfolio includes properties acquired or fully placed in-service on or prior to July 1, 20162020 and owned and in-service through September 30, 2017.2021. The Total Property Portfolio includes the effects of the other properties either acquired, placed in-service, acquired or in development or redevelopment after July 1, 20162020 or disposed of on or prior to September 30, 2017.2021. This table includes a reconciliation from the Same Property Portfolio to the Total Property Portfolio by also providing information for the three months ended September 30, 20172021 and 20162020 with respect to the properties that were acquired, placed in-service, acquired, in development or redevelopment or sold. We did not sell any properties during the three months ended September 30, 2021 and 2020.



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 Same Property PortfolioProperties
Acquired Portfolio		Properties
Placed In-Service
Portfolio		Properties in
Development or
Redevelopment
Portfolio		Total Property Portfolio
20212020Increase/
(Decrease)		%
Change		20212020202120202021202020212020Increase/
(Decrease)		%
Change
(dollars in thousands)
Rental Revenue: (1)
Lease Revenue (Excluding Termination Income)$671,248 $649,484 $21,764 3.35 %$2,840 $— $3,904 $157 $1,752 $4,753 $679,744 $654,394 $25,350 3.87 %
Termination Income1,874 2,715 (841)(30.98)%— — — — — — 1,874 2,715 (841)(30.98)%
Lease Revenue673,122 652,199 20,923 3.21 %2,840 — 3,904 157 1,752 4,753 681,618 657,109 24,509 3.73 %
Parking and Other23,250 16,170 7,080 43.78 %— — 5 4 — — 23,255 16,174 7,081 43.78 %
Total Rental Revenue (1)696,372 668,369 28,003 4.19 %2,840 — 3,909 161 1,752 4,753 704,873 673,283 31,590 4.69 %
Real Estate Operating Expenses249,844 250,951 (1,107)(0.44)%582 — 648 307 1,162 2,048 252,236 253,306 (1,070)(0.42)%
Net Operating Income (Loss), Excluding Residential and Hotel446,528 417,418 29,110 6.97 %2,258 — 3,261 (146)590 2,705 452,637 419,977 32,660 7.78 %
Residential Net Operating Income (Loss) (2)5,731 5,480 251 4.58 %— — (882)(717)— — 4,849 4,763 86 1.81 %
Hotel Net Operating Income (Loss) (2)1,243 (3,074)4,317 140.44 %— — — — — — 1,243 (3,074)4,317 140.44 %
Net Operating Income (Loss)$453,502 $419,824 $33,678 8.02 %$2,258 $— $2,379 $(863)$590 $2,705 $458,729 $421,666 $37,063 8.79 %
_______________
(1)Rental Revenue is equal to Revenue less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Revenue per the Consolidated Statements of Operations, excluding the residential and hotel revenue that is noted below. We use Rental Revenue internally as a performance measure and in calculating other non-GAAP financial measures (e.g., NOI), which provides investors with information regarding our performance that is not immediately apparent from the comparable non-GAAP measures and allows investors to compare operating performance between periods.
(2)For a detailed discussion of NOI, including the reasons management believes NOI is useful to investors, see page 59. Residential Net Operating Income for the three months ended September 30, 2021 and 2020 is comprised of Residential Revenue of $10,894 and $9,718 less Residential Expenses of $6,045 and $4,955, respectively. Hotel Net Operating Income (Loss) for the three months ended September 30, 2021 and 2020 is comprised of Hotel Revenue of $5,189 and $90 less Hotel Expenses of $3,946 and $3,164, respectively, per the Consolidated Statements of Operations.
73
 Same Property Portfolio 
Properties
Placed In-Service
Portfolio
 Properties Acquired Portfolio Properties in
Development or
Redevelopment
Portfolio		 Properties Sold Portfolio Total Property Portfolio
(dollars in thousands)2017 2016 
Increase/
(Decrease)
 
%
Change
 2017 2016 2017 2016 2017 2016 2017 2016 2017 2016 Increase/
(Decrease)		 %
Change
Rental Revenue:                               
Rental Revenue$618,930
 $599,451
 $19,479
 3.25 % $4,267
 $174
 $689
 $—
 $873
 $2,233
 $—
 $450
 $624,759
 $602,308
 $22,451
 3.73%
Termination Income4,740
 836
 3,904
 466.99 % —
 —
 —
 —
 43
 (1,006) —
 —
 4,783
 (170) 4,953
 2,913.53%
Total Rental Revenue623,670
 600,287
 23,383
 3.90 % 4,267
 174
 689
 —
 916
 1,227
 —
 450
 629,542
 602,138
 27,404
 4.55%
Real Estate Operating Expenses231,351
 223,024
 8,327
 3.73 % 1,674
 53
 269
 —
 2,452
 2,920
 18
 340
 235,764
 226,337
 9,427
 4.17%
Net Operating Income (Loss), excluding residential and hotel392,319
 377,263
 15,056
 3.99 % 2,593
 121
 420
 —
 (1,536) (1,693) (18) 110
 393,778
 375,801
 17,977
 4.78%
Residential Net Operating Income (1)2,711
 2,772
 (61) (2.20)% —
 —
 —
 —
 7
 (623) —
 —
 2,718
 2,149
 569
 26.48%
Hotel Net Operating Income (1)4,617
 4,236
 381
 8.99 % —
 —
 —
 —
 —
 —
 —
 —
 4,617
 4,236
 381
 8.99%
Net Operating Income (Loss) (1)$399,647
 $384,271
 $15,376
 4.00 % $2,593
 $121
 $420
 $—
 $(1,529) $(2,316) $(18) $110
 $401,113
 $382,186
 $18,927
 4.95%
_______________  
(1)
For a detailed discussion of NOI, including the reasons management believes NOI is useful to investors, see page 50. Residential Net Operating Income for the three months ended September 30, 2017 and 2016 is comprised of Residential Revenue of $4,295 and $4,372, less Residential Expenses of $1,577 and $2,223, respectively. Hotel Net Operating Income for the three months ended September 30, 2017 and 2016 is comprised of Hotel Revenue of $13,064 and $12,354 less Hotel Expenses of $8,447 and $8,118, respectively, per the Consolidated Statements of Operations.


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Same Property Portfolio
RentalLease Revenue (Excluding Termination Income)
RentalLease revenue from the Same Property Portfolio increased by approximately $19.5$21.8 million for the three months ended September 30, 20172021 compared to 2016. The2020. Approximately $7.5 million of the increase wasrelated to write-offs of accrued rent and accounts receivable balances that occurred during the three months ended September 30, 2020 and did not recur in 2021, for primarily retail tenants that either terminated their leases or we determined that the resultaccrued rent and/or accounts receivable balances were no longer probable of increases in revenue from our leases and parking and other income ofcollection. Excluding the write-offs, the Same Property Portfolio increased by approximately $18.9$14.3 million and $1.5 million partially offset by a decrease in other tenant recoveries of approximately $0.9 million. Rental revenue from our leases increased approximately $18.9 million as a result ofprimarily due to our average revenue per square foot increasing by approximately $1.96, which contributed$2.77, resulting in an increase of approximately $17.5$24.1 million, andpartially offset by an approximately $1.4$9.8 million increasedecrease due to our average occupancy increasingdecreasing from 91.58%92.4% to 91.78%91.0%.
We continue to evaluate the collectability of our accrued rent and accounts receivable balances related to lease revenue. If after a write-off has been recorded, (1) we subsequently determine that we are probable we will collect substantially all the remaining lessee’s lease payments under the lease term and (2) the lease has not been modified since the write-off, we will then reinstate the accrued rent and accounts receivable write-offs, adjusting for the amount related to the period when the lease payments were considered not probable of collection. If our estimate of collectability differs from the cash received, then the timing and amount of our reported revenue could be impacted.
Each quarter since the second quarter of 2020, the number of executed COVID-19 lease modifications has decreased and as of the third quarter of 2021, we are executing COVID-19 modifications on a limited basis.
Termination Income
Termination income increaseddecreased by approximately $3.9$0.8 million for the three months ended September 30, 20172021 compared to 2016.2020.
Termination income for the three months ended September 30, 20172021 related to seventeensix tenants across the Same Property Portfolio and totaled approximately $4.7$1.9 million, of which approximately $3.0 million is fromwas primarily related to tenants that terminated leases early at 767 Fifth Avenue (the General Motors Building). This building is located in New York City.
Termination income for the three months ended September 30, 20162020 related to nine10 tenants across the Same Property Portfolio and totaled approximately $2.7 million, which was primarily related to tenants that terminated leases early in New York City and the Washington, DC region.
Parking and Other Revenue
Parking and other revenue increased by approximately $7.1 million for the three months ended September 30, 2021 compared to 2020. Parking revenue and other revenue increased by approximately $6.3 million and $0.8 million.million, respectively. The increase in parking revenue was primarily due to an increase in transient parking.
Real Estate Operating Expenses
Real estate operating expenses from the Same Property Portfolio increaseddecreased by approximately $8.3$1.1 million, or 3.7%0.4%, for the three months ended September 30, 20172021 compared to 20162020, due primarily to increasesa decrease in real estate taxes of approximately $5.9 million, or 4.4%, offset by an increase in utility and other real estate operating expenses of approximately $5.9$3.1 million, or 5.5%12.1%, and $2.4$1.7 million, or 2.1%1.9%, respectively. The increasedecrease in real estate taxes was primarily experienced in the New York CBD properties.
Properties Placed In-Service Portfolio
City. The table below listsincrease in utility expense was experienced across the properties placed in-service or partially placed in-service from July 1, 2016 through September 30, 2017. Rental revenueportfolio and real estate operating expenses increasedwas primarily driven by approximately $4.1 millionan increase in physical tenant occupancy, which led to higher demand for electricity and $1.6 million, respectively, for the three months ended September 30, 2017 compared to 2016 as detailed below.


HVAC.
74
  Quarter Initially Placed In-Service Quarter Fully Placed In-Service   Rental Revenue Real Estate Operating Expenses
Name   Square Feet 2017 2016 Change 2017 2016 Change
        (dollars in thousands)
Reservoir Place North Second Quarter, 2016 Second Quarter, 2017 73,258
 $—
 $—
 $—
 $103
 $34
 $69
888 Boylston Street Third Quarter, 2016 Third Quarter, 2017 417,000
 4,267
 174
 4,093
 1,571
 19
 1,552
      490,258
 $4,267
 $174
 $4,093
 $1,674
 $53
 $1,621
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Properties Acquired Portfolio
The table below lists the properties acquired between July 1, 20162020 and September 30, 2017.2021. Rental revenue and real estate operating expenses increased by approximately $0.7$2.8 million and $0.3$0.6 million, respectively, for the three months ended September 30, 20172021 compared to 2016,2020, as detailed below.
Square FeetRental RevenueReal Estate Operating Expenses
NameDate acquired20212020Change20212020Change
(dollars in thousands)
153 & 211 Second AvenueJune 2, 2021136,882 $2,345 $— $2,345 $248 $— $248 
Shady Grove Bio+Tech CampusAugust 2, 2021233,452 495 — 495 334 — 334 
370,334 $2,840 $— $2,840 $582 $— $582 
      Rental Revenue Real Estate Operating Expenses
Name Date acquired Square Feet 2017 2016 Change 2017 2016 Change
      (dollars in thousands)
103 Carnegie Center May 25, 2017 96,332
 $689
 $—
 $689
 $269
 $—
 $269

65


Properties in Development or Redevelopment Portfolio
The table below lists the properties we placed in development or redevelopment between July 1, 2016 and September 30, 2017. Rental revenue and real estate operating expenses decreased by approximately $0.3 million and $0.5 million, for the three months ended September 30, 2017 compared to 2016, as detailed below.
      Rental Revenue Real Estate Operating Expenses
Name Date commenced development / redevelopment Square Feet 2017 2016 Change 2017 2016 Change
      (dollars in thousands)
One Five Nine East 53rd Street (1) August 19, 2016 220,000
 $916
 $106
 $810
 $2,204
 $2,133
 $71
191 Spring Street (2) December 29, 2016 160,000
 —
 197
 (197) 233
 482
 (249)
145 Broadway (3) April 6, 2017 79,616
 —
 924
 (924) 15 305
 (290)
    459,616
 $916
 $1,227
 $(311) $2,452
 $2,920
 $(468)
___________
(1)This is the low-rise portion of 601 Lexington Avenue in New York City. Rental revenue includes approximately $43,000 and $(1.0) million of termination income for the three months ended September 30, 2017 and September 30, 2016, respectively. In addition, real estate operating expenses includes approximately $1.8 million and $0.7 million of demolition costs for the three months ended September 30, 2017 and September 30, 2016, respectively.
(2)Real estate operating expenses for the three months ended September 30, 2017 includes approximately $0.2 million of demolition costs.
(3)On April 6, 2017, we commenced the development of 145 Broadway, a build-to-suit Class A office project with approximately 485,000 net rentable square feet located in Cambridge, Massachusetts.
In addition, during the three months ended September 30, 2017 and September 30, 2016, we had approximately $(7,000) and $0.6 million of demolition costs related to our Proto Kendall Square residential development project.
Properties SoldPlaced In-Service Portfolio
The table below lists the properties we soldthat were placed in-service or partially placed in-service between July 1, 20162020 and September 30, 2017.2021. Rental revenue and real estate operating expenses from our Properties SoldPlaced In-Service Portfolio decreasedincreased by approximately $0.5$4.5 million and $0.3$1.3 million, respectively, for the three months ended September 30, 20172021 compared to 20162020, as detailed below.
Quarter Initially Placed In-ServiceQuarter Fully Placed In-ServiceRental RevenueReal Estate Operating Expenses
NameSquare Feet20212020Change20212020Change
(dollars in thousands)
Office
One Five Nine East 53rd Street (1)First Quarter, 2021First Quarter, 2021220,000 $3,909 $161 $3,748 $648 $307 $341 
Total Office220,000 3,909 161 3,748 648 307 341 
Residential
The SkylyneThird Quarter, 2020Third Quarter, 2020330,996 806 23 783 1,688 740 948 
Total Residential330,996 806 23 783 1,688 740 948 
550,996 $4,715 $184 $4,531 $2,336 $1,047 $1,289 
_______________
(1)This is the low-rise portion of 601 Lexington Avenue, which was in development for the three months ended September 30, 2020.

Properties in Development or Redevelopment Portfolio
The table below lists the properties that were in development or redevelopment between July 1, 2020 and September 30, 2021. Rental revenue and real estate operating expenses from our Properties in Development or Redevelopment Portfolio decreased by approximately $3.0 million and $0.9 million, respectively, for the three months ended September 30, 2021 compared to 2020.
Rental RevenueReal Estate Operating Expenses
NameDate Commenced Development / RedevelopmentSquare Feet20212020Change20212020Change
(dollars in thousands)
325 Main Street (1)May 9, 2019115,000 $— $— $— $169 $207 $(38)
200 West Street (2)September 30, 2019261,000 1,752 1,233 519 932 784 148 
880 Winter Street (3)February 25, 2021224,000 — 1,977 (1,977)61 706 (645)
3625-3635 Peterson Way (4)April 16, 2021218,000 — 1,543 (1,543)— 351 (351)
818,000 $1,752 $4,753 $(3,001)$1,162 $2,048 $(886)
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        Rental Revenue Real Estate Operating Expenses
Name Date Sold Property Type Square Feet 2017 2016 Change 2017 2016 Change
        (dollars in thousands)
30 Shattuck Road April 19, 2017 Land N/A
 $—
 $—
 $—
 $—
 $11
 $(11)
40 Shattuck Road June 13, 2017 Office 122,000
 —
 450
 (450) —
 297
 (297)
Reston Eastgate August 30, 2017 Land N/A
 —
 —
 —
 18
 32
 (14)
      122,000
 $—
 $450
 $(450) $18
 $340
 $(322)
_______________

(1)Real estate operating expenses for the three months ended September 30, 2021 and 2020 were related to demolition costs.
(2)Conversion of a 126,000 square foot portion of the property to life sciences space from office space.
(3)On February 25, 2021, we commenced the redevelopment and conversion of 880 Winter Street, a 224,000 square foot office property located in Waltham, Massachusetts, to laboratory space.
(4)On April 16, 2021, we removed 3625-3635 Peterson Way, located in Santa Clara, California, from our in-service portfolio. We are demolishing the building and expect to redevelop the site at a future date.
Residential Net Operating Income
Net operating income for our residential same properties decreasedincreased by approximately $61,000$0.3 million for the three months ended September 30, 20172021 compared to 2016.2020. Net operating income for the three months ended September 30, 2020 includes approximately $0.7 million of termination income from a retail tenant.
The following reflects our occupancy and rate information for The Lofts at Atlantic Wharf, and The Avant at Reston Town Center, Signature at Reston and Proto Kendall Square for the three months ended September 30, 20172021 and 2016.2020.

The Lofts at Atlantic WharfThe Avant at Reston Town CenterSignature at RestonProto Kendall Square
20212020Change (%)20212020Change (%)20212020Change (%)20212020Change (%)
Average Monthly Rental Rate (1)$3,747 $4,231 (11.4)%$2,299 $2,352 (2.3)%$2,429 $2,319 4.7 %$2,642 $2,676 (1.3)%
Average Rental Rate Per Occupied Square Foot$4.17 $4.62 (9.7)%$2.50 $2.57 (2.7)%$2.51 $2.42 3.7 %$4.82 $4.91 (1.8)%
Average Physical Occupancy (2)96.5 %80.2 %20.3 %96.3 %89.7 %7.4 %93.2 %82.2 %13.4 %94.5 %85.7 %10.3 %
Average Economic Occupancy (3)95.4 %80.7 %18.2 %96.3 %88.9 %8.3 %92.0 %78.2 %17.6 %93.9 %83.1 %13.0 %
66_______________  

Table(1)Average Monthly Rental Rate is calculated as the average of Contents
the quotients obtained by dividing (A) rental revenue as determined in accordance with GAAP, by (B) the number of occupied units for each month within the applicable fiscal period.

(2)Average Physical Occupancy is defined as (1) the average number of occupied units divided by (2) the total number of units, expressed as a percentage.
  The Lofts at Atlantic Wharf The Avant at Reston Town Center
  2017 2016 Percentage
Change		 2017 2016 Percentage
Change
Average Monthly Rental Rate (1) $4,295
 $4,146
 3.6 % $2,418
 $2,429
 (0.5)%
Average Rental Rate Per Occupied Square Foot $4.74
 $4.63
 2.4 % $2.68
 $2.68
 — %
Average Physical Occupancy (2) 94.2% 97.3% (3.2)% 95.7% 95.6% 0.1 %
Average Economic Occupancy (3) 95.5% 97.7% (2.3)% 94.4% 95.6% (1.3)%
___________  
(1)Average Monthly Rental Rate is defined as rental revenue in accordance with GAAP, divided by the weighted monthly average number of occupied units. 
(2)Average Physical Occupancy is defined as (1) the average number of occupied units divided by (2) the total number of units, expressed as a percentage.
(3)Average Economic Occupancy is defined as (1) total possible revenue less vacancy loss divided by (2) total possible revenue, expressed as a percentage. Total possible revenue is determined by valuing average occupied units at contract rates and average vacant units at Market Rents. Vacancy loss is determined by valuing vacant units at current Market Rents. By measuring vacant units at their Market Rents, Average Economic Occupancy takes into account the fact that units of different sizes and locations within a residential property have different economic impacts on a residential property's total possible gross revenue. Market Rents used by us in calculating Economic Occupancy are based on the current market rates set by the managers of our residential properties based on their experience in renting their residential property’s units and publicly available market data. Trends in market rents for a region as reported by others could vary. Market Rents for a period are based on the average Market Rents during that period and do not reflect any impact for cash concessions.

(3)Average Economic Occupancy is defined as (1) total possible revenue less vacancy loss divided by (2) total possible revenue, expressed as a percentage. Total possible revenue is determined by valuing average occupied units at contract rates and average vacant units at Market Rents. Vacancy loss is determined by valuing vacant units at current Market Rents. By measuring vacant units at their Market Rents, Average Economic Occupancy takes into account the fact that units of different sizes and locations within a residential property have different economic impacts on a residential property’s total possible gross revenue. Market Rents used by us in calculating Economic Occupancy are based on the current market rates set by the managers of our residential properties based on their experience in renting their residential property’s units and publicly available market data. Actual market rents and trends in such rents for a region as reported by others may vary materially from Market Rents used by us. Market Rents for a period are based on the average Market Rents during that period and do not reflect any impact for cash concessions.
Hotel Net Operating Income (Loss)
Net operating income for theThe Boston Marriott Cambridge hotel property increased byoperated at an approximately $0.4$1.2 million forprofit during the three months ended September 30, 2017 compared2021. This is approximately $4.3 million greater than the three months ended September 30, 2020.
The Boston Marriott Cambridge closed in March 2020 due to 2016.COVID-19. The hotel re-opened on October 2, 2020 and has operated at lower occupancy levels due to the continued impact of COVID-19 on business and leisure travel. The closing of the hotel for more than two fiscal quarters, and the lower demand and low occupancy since its re-opening, have had, and are expected to continue to have, a material adverse effect on the hotel’s operations. We expect hotel occupancy to remain low until the demand for business and leisure travel returns to historical levels.
The following reflects our occupancy and rate information for the Boston Marriott Cambridge hotel for the three months ended September 30, 20172021 and 2016.2020.
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 2017 2016 
Percentage
Change
20212020
Change (%)
Occupancy 90.3% 87.2% 3.6%Occupancy49.4 %— %100.0 %
Average daily rate $283.76
 $279.03
 1.7%Average daily rate$222.31 $— 100.0 %
Revenue per available room, REVPAR $256.32
 $243.19
 5.4%
REVPARREVPAR$109.86 $— 100.0 %
Other Operating Revenue and Expense Items
Development and Management Services Revenue
Development and management services revenue increaseddecreased by an aggregate of approximately $4.4$1.2 million for the three months ended September 30, 20172021 compared to 2016.2020. Development and management services revenue increaseddecreased by approximately $3.5$1.1 million and $0.9$0.1 million, respectively. The increasedecrease in development services revenue iswas primarily related to ana decrease of approximately $2.5$0.6 million development fee we received as a result of a third-party terminating their development agreement with us. The remaining increase in the development fees earned wasin New York City from a third-party development agreement in the Boston region and from our New Yorkan unconsolidated joint venture that is developing Dock 72and a decrease of approximately $0.5 million in Brooklyn, New York. Managementfees associated with tenant improvement projects earned from a building owned by a third-party in the Washington, DC region. The decrease in management services revenue increasedwas primarily duerelated to an increasea decrease in service income that weproperty management fees earned from our tenantsthird-party owned buildings in the New YorkWashington, DC region.
Operating Income and Expense Items
General and Administrative Expense
General and administrative expense increased by approximately $0.6$6.7 million for the three months ended September 30, 20172021 compared to 20162020 primarily due to an increase in compensation expense of approximately $6.4 million, and an increase of approximately $0.3 million in other general and administrative expenses increasing by approximately $0.4 million and $0.2 million, respectively.expenses. The increase in compensation expense was primarily related to (1) an approximately $0.7 million difference between the unrecognized expense remaining from the 2014 MYLTIP Units compared to the expense that was recognized during the three months ended September 30, 2017 for the newly issued 2017 MYLTIP Units (See Notes 8 and 11 to the Consolidated Financial Statements) and (2) an increase in other compensation related expenses of approximately $0.2 million. These increases were partially offset by an increase in capitalized wagesa decrease of approximately $0.5 million. The increase$2.1 million in capitalized wages is shown as a decrease in general and administrative expense as these costs are

67


capitalized and included in real estate assets orour deferred charges on our Consolidated Balance Sheets (see below).compensation plan. The increase in other general and administrative expenses was primarily related to an increase in professional fees.meals and travel expense.
Wages directly related to the development and leasing of rental properties are capitalized and included in real estate assets or deferred charges on our Consolidated Balance Sheets and amortized over the useful lives of the applicable asset or lease term. Capitalized wages for the three months ended September 30, 20172021 and 20162020 were approximately $4.7 million and $4.2 million, respectively.$3.4 million. These costs are not included in the general and administrative expenses discussed above.
Impairment LossTransaction Costs
On September 27, 2016, we executed a letter of intentTransaction costs increased by approximately $1.6 million for the sale of the remaining parcel of land at our Washingtonian North property located in Gaithersburg, Maryland. The letter of intent caused us to reevaluate our strategy for the land and based on a shorter than expected hold period, we reduced the carrying value of the land to the estimated net sales price and recognized an impairment loss of approximately $1.8 million during the three months ended September 30, 2016.2021 compared to 2020 due primarily to costs incurred in connection with the pursuit and formation of new joint ventures. In general, transaction costs relating to the formation of new and pending joint ventures and the pursuit of other transactions are expensed as incurred.
Depreciation and Amortization Expense
Depreciation expense may differ between BXP and BPLP as a result of previously applied acquisition accounting by BXP for the issuance of common stock in connection with non-sponsor OP Unit redemptions by BPLP.  This accounting resulted in a step-up of the real estate assets at BXP that was allocated to certain properties.  The difference between the real estate assets of BXP as compared to BPLP for certain properties having an allocation of the real estate step-up will result in a corresponding difference in depreciation expense. For additional information see the Explanatory Note that follows the cover page of this Quarterly Report on Form 10-Q.
Boston Properties, Inc.
Depreciation and amortization expense decreasedincreased by approximately $51.6$13.0 million for the three months ended September 30, 20172021 compared to 2016, respectively,2020, as detailed below.
77
  Depreciation and Amortization Expense for the three months ended September 30,
2017 2016 Change
  (in thousands)
Same Property Portfolio $150,367
 $151,733
 $(1,366)
Properties Placed in-Service Portfolio 1,059
 8
 1,051
Properties Acquired Portfolio 738
 —
 738
Properties in Development or Redevelopment Portfolio (1) —
 51,817
 (51,817)
Properties Sold Portfolio —
 190
 (190)
  $152,164
 $203,748
 $(51,584)
___________
(1)
On August 19, 2016, the consolidated entity in which we have a 55% interest and that owns 601 Lexington Avenue located in New York City commenced the redevelopment of the six-story, low-rise office and retail building component of the complex. The redeveloped portion of the low-rise building will contain approximately 195,000 net rentable square feet of Class A office space and approximately 25,000 net rentable square feet of retail space. We recorded approximately $50.8 million, including $3.2 million related to the step-up of real estate assets, of accelerated depreciation expense for the portion of the complex demolished.


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PortfolioDepreciation and Amortization for the three months ended September 30,
20212020Change
(in thousands)
Same Property Portfolio$171,977 $163,114 $8,863 
Properties Acquired Portfolio3,761 — 3,761 
Properties Placed In-Service Portfolio3,295 695 2,600 
Properties in Development or Redevelopment Portfolio379 2,647 (2,268)
$179,412 $166,456 $12,956 

Boston Properties Limited Partnership
Depreciation and amortization expense decreasedincreased by approximately $48.4$13.0 million for the three months ended September 30, 20172021 compared to 2016, respectively,2020, as detailed below.
PortfolioDepreciation and Amortization for the three months ended September 30,
20212020Change
(in thousands)
Same Property Portfolio$170,242 $161,364 $8,878 
Properties Acquired Portfolio3,761 — 3,761 
Properties Placed In-Service Portfolio3,295 695 2,600 
Properties in Development or Redevelopment Portfolio379 2,647 (2,268)
$177,677 $164,706 $12,971 
  Depreciation and Amortization Expense for the three months ended September 30,
2017 2016 Change
  (in thousands)
Same Property Portfolio $148,413
 $149,749
 $(1,336)
Properties Placed in-Service Portfolio 1,059
 8
 1,051
Properties Acquired Portfolio 738
 —
 738
Properties in Development or Redevelopment Portfolio (1) —
 48,635
 (48,635)
Properties Sold Portfolio —
 190
 (190)
  $150,210
 $198,582
 $(48,372)

___________Direct Reimbursements of Payroll and Related Costs From Management Services Contracts and Payroll and Related Costs From Management Service Contracts
(1)On August 19, 2016, the consolidated entity in which we have a 55% interest and that owns 601 Lexington Avenue located in New York City commenced the redevelopment of the six-story, low-rise office and retail building component of the complex. The redeveloped portion of the low-rise building will contain approximately 195,000 net rentable square feet of Class A office space and approximately 25,000 net rentable square feet of retail space. We recorded approximately $47.6 million of accelerated depreciation expense for the portion of the complex demolished.
We have determined that amounts reimbursed for payroll and related costs received from third parties in connection with management services contracts should be reflected on a gross basis instead of on a net basis as we have determined that we are the principal under these arrangements. We anticipate that these two financial statement line items will generally offset each other.
Other Income and Expense Items
IncomeLoss from Unconsolidated Joint Ventures
IncomeFor the three months ended September 30, 2021 compared to 2020, loss from unconsolidated joint ventures decreased by approximately $1.3 million due to a $2.2 million increase in net income at our Colorado Center joint venture, primarily due to a write-off of lease revenue during the three months ended September 30, 2020. This increase was partially offset by an approximately $1.1 million decrease in net income from our Dock 72 joint venture, primarily related to depreciation and amortization.
Gains (Losses) on Sales of Real Estate
Gains (losses) on sales of real estate increased by approximately $0.6 million for the three months ended September 30, 20172021 compared to 2016 due primarily to2020. During the three months ended September 30, 2021, we recognized a decrease in our sharegain of net income from our Annapolis Junction, 540 Madison Avenue and Colorado Center joint ventures. The decrease in our share of net income from our Annapolis Junction joint venture is primarily due to a decrease in occupancy and an increase in interest expenseapproximately $0.3 million related to Annapolis Junction Building One’s mortgage loan having an eventthe sale of default and, commencing October 17, 2016, being charged interest at6595 Springfield Center Drive (See Note 3 to the default interest rate. The decrease in net income from our 540 Madison Avenue joint venture was primarilyConsolidated Financial Statements). During the three months ended September 30, 2020, we incurred approximately $0.2 million of additional expenses related to an increasethe sale of a portion of Capital Gallery in interest expense as the mortgage loan that encumbers the property bears interest atWashington, DC, thus resulting in a variable rate. On July 28, 2017, the joint venture that owns Colorado Center obtained mortgage loan financing, the resultloss on sale of which increased interest expense, which reduced the net income for the joint venture. For additional information pertaining to the Annapolis Junction Building One mortgage loan refer to “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations—Capitalization—Off-Balance Sheet Arrangements—Joint Venture Indebtedness.”real estate.
Interest and Other Income (Loss)
Interest and other income decreased(loss) increased by approximately $2.3$1.6 million for the three months ended September 30, 20172021 compared to 2016 due primarily to a decrease in other income of approximately $3.0 million partially offset by an increase in interest income of approximately $0.7 million. During the three months ended September 30, 2017, the decrease in other income was primarily2020, due to an approximately $1.3$1.9 million tax credit that we received from our Washington, DC region and approximately $1.7 million related to the sale of historic tax credits at The Lofts at Atlantic Wharf in Boston, Massachusetts. Both of these items did not recur during 2017.
On October 20, 2010, we closed a transaction with a financial institution (the “HTC Investor”) related to the historic rehabilitation of The Lofts at Atlantic Wharf in Boston, Massachusetts. The HTC Investor has contributed an aggregate of approximately $15 million to the project. As part of its contribution, the HTC Investor received substantially all of the benefits derived from the tax credits. Beginning in July 2012 through July 2016, we recognized the cash received as revenue over the five-year tax credit recapture period as defineddecrease in the Internal Revenue Code.

allowance for current
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Losses from Early Extinguishmentsexpected credit losses, which results in higher income, partially offset by a decrease of Debtapproximately $0.3 million in interest income as a result of lower interest earned on our deposits.
On SeptemberJanuary 1, 2016,2020, we usedadopted ASU 2016-13 and, as a portion of the net proceeds from BPLP’s offering of senior unsecured notes and available cashresult, we were required to repay the mortgage loan collateralized by our 599 Lexington Avenue property located in New York City totaling $750.0 million. The mortgage loan bore interest at a fixed rate of 5.57% per annum (5.41% per annum GAAP interest rate) and was scheduled to mature on March 1, 2017. There was no prepayment penalty. We recognized a gain from early extinguishment of debt totaling approximately $0.4 million consisting of the acceleration of the remaining balancerecord an allowance for current expected credit losses related to the effective portion of a previous interest rate hedging program included within accumulated other comprehensive loss, offset by the write-off of unamortized deferred financing costs.
On September 1, 2016, we used a portion of the net proceeds from BPLP’s offering of senior unsecuredour outstanding (1) related party note receivable, (2) notes receivable and available cash to repay the mortgage loan collateralized by our Embarcadero Center Four property located in San Francisco, California totaling approximately $344.8 million. The mortgage loan bore interest at a fixed rate of 6.10% per annum (7.02% per annum GAAP interest rate) and was scheduled to mature on December 1, 2016. There was no prepayment penalty. We recognized a loss from early extinguishment of debt totaling approximately $0.7 million consisting of the write-off of unamortized deferred financing costs and the acceleration of the remaining balance related to the effective portion of a previous interest rate hedging program included within accumulated other comprehensive loss.(3) off-balance sheet credit exposures.
Gains (Losses) from Investments in Securities
Gains (losses) from investments in securities for the three months ended September 30, 20172021 and 20162020 related to investments that we have made to reduce our market risk relating to a deferred compensation planplans that we maintain for BXP’s officers.officers and former non-employee directors. Under thisthe deferred compensation plan,plans, each officer or non-employee director who is eligible to participate is permitted to defer a portion of the officer’s current income or the non-employee director’s compensation on a pre-tax basis and receive a tax-deferred return on these deferrals based on the performance of specific investments selected by the officer.officer or non-employee director. In order to reduce our market risk relating to this plan,these plans, we typically acquire, in a separate account that is not restricted as to its use, similar or identical investments as those selected by each officer.officer or non-employee director. This enables us to generally match our liabilities to BXP’s officers or former non-employee directors under theour deferred compensation planplans with equivalent assets and thereby limit our market risk. The performance of these investments is recorded as gains (losses) from investments in securities. During the three months ended September 30, 20172021 and 2016,2020, we recognized gains (losses) of approximately $0.9$(0.2) million and $1.0$1.9 million, respectively, on these investments. By comparison, our general and administrative expense increased (decreased) by approximately $0.9$(0.2) million and $1.0$1.9 million during the three months ended September 30, 20172021 and 2016,2020, respectively, as a result of an increaseincreases (decreases) in our liability under our deferred compensation planplans that werewas associated with the performance of the specific investments selected by officers and former non-employee directors of BXP participating in the plan.

plans.
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Interest Expense
Interest expense decreased by approximately $12.6$5.2 million for the three months ended September 30, 20172021 compared to 20162020, as detailed below:below.
Component Change in interest
expense for the three
months ended
September 30, 2017
compared to
September 30, 2016
  (in thousands)
Increases to interest expense due to:  
Refinancing of the debt collateralized by 767 Fifth Avenue (the General Motors Building) (1) $8,657
Issuance of $1.0 billion in aggregate principal of 2.750% senior notes due 2026 on August 17, 2016 4,269
Utilization of the Unsecured Line of Credit as well as an increase in capacity due to the execution of the 2017 Credit Facility (1) 417
Amortization of deferred financing fees for BPLP’s unsecured debt and credit facility 373
Other interest expense (excluding senior notes) 271
Total increases to interest expense 13,987
Decreases to interest expense due to:  
Repayment of mortgage financings (2) (11,032)
Decrease in the interest for the Outside Members’ Notes Payable for the 767 Fifth Avenue (the General Motors Building) (3) (8,694)
Increase in capitalized interest (4) (6,870)
Total decreases to interest expense (26,596)
Total change in interest expense $(12,609)
___________ 
(1)ComponentSee Note 5 to the Consolidated Financial Statements.
(2)Includes the repayment of the mortgage loans collateralized by Embarcadero Center Four and 599 Lexington Avenue.
(3)
The relatedChange in interest expense from the Outside Members’ Notes Payable totaled approximately $8.7 million for the three months ended September 30, 2016. This amount was allocated2021 compared to the outside joint venture partners as an adjustmentSeptember 30, 2020
(in thousands)
Increases to Noncontrolling Interests in Property Partnerships in our Consolidated Statements of Operations. On June 7, 2017, a portion of the outside members’ notes payable was repaid and the remaining portion was contributed as equity in the consolidated entity (See Notes 5 and 8 to the Consolidated Financial Statements).interest expense due to:
(4)Issuance of $850 million in aggregate principal of 2.550% senior notes due 2032 on March 16, 2021
The increase was primarily
$5,491 
Decrease in capitalized interest related to development projects2,876 
Increase in interest due to the commencement and continuationfinance leases for two in-service properties447 
Issuance of several development projects. For a list$850 million in aggregate principal of 2.450% senior notes due 2033 on September 29, 2021116 
Total increases to interest expense8,930 
Decreases to interest expense due to:
Redemption of $850 million in aggregate principal of 4.125% senior notes due 2021 on February 14, 2021(8,945)
Increase in capitalized interest related to development projects referthat had finance leases(2,876)
Decrease in interest due to “Liquidityfinance leases that are related to development properties(999)
Decrease in interest rates for the 2017 and Capital Resources” within “Item 2—Management’s Discussion2021 Credit Facilities and Analysisthe repayment of Financial Condition and Resultsthe unsecured term loan on March 16, 2021 (1)(981)
Other interest expense (excluding senior notes)(286)
Decrease in interest related to the repayment of Operations.”University Place mortgage loan(42)
Total decreases to interest expense(14,129)
Total change in interest expense$(5,199)
_______________
(1) On June 15, 2021, BPLP entered into the 2021 Credit Facility, which replaced the 2017 Credit Facility (See Note 8 to the Consolidated Financial Statements).
Interest expense directly related to the development of rental properties is capitalized and included in real estate assets on our Consolidated Balance Sheets and amortized over the useful lives of the real estate or lease term. As portions of properties are placed in-service, we cease capitalizing interest on these portionsthat portion and interest is then expensed. Interest capitalized for the three months ended September 30, 20172021 and 20162020 was approximately $16.7$11.6 million and $9.8$13.5 million, respectively. These costs are not included in the interest expense referenced above.
On October 15, 2021, BPLP used available cash and funds under its 2021 Credit Facility to complete the redemption of $1.0 billion in aggregate principal amount of its 3.85% senior notes due February 1, 2023. The redemption price was approximately $1.05 billion, which was equal to par plus approximately $7.9 million of accrued and unpaid interest to, but not including, the redemption date and an early redemption premium and unamortized financing costs totaling approximately $43.9 million. We expect to recognize a loss from early extinguishment of debt related primarily to the payment of the redemption premium in the fourth quarter.
At September 30, 2017,2021, our outstanding variable rate debt consisted of BPLP’s $2.0$1.5 billion 2017 CreditRevolving Facility. The Revolving Facility of which no amount wasdid not have an outstanding atbalance as of September 30, 2017.2021. For a summary of our consolidated debt as of September 30, 20172021 and September 30, 20162020 refer to the heading “Liquidity and Capital Resources—Capitalization—Debt Financing” within “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations.Operations.”
Losses from Interest Rate Contracts
On August 17, 2016, in conjunction with BPLP’s offering of its 2.750% senior unsecured notes due 2026, we terminated forward-starting interest rate swap contracts that fixed the 10-year swap rate at a weighted-average rate of approximately 2.423% per annum on notional amounts aggregating $550.0 million. We cash-settled the contracts and made cash payments to the counterparties aggregating approximately $49.3 million. We recognized approximately $0.1 million of losses on interest rate contracts during the three months ended September 30, 2016 related to the partial ineffectiveness of the interest rate

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contracts. We will reclassify into earnings over the 10-year term of the 2.750% senior unsecured notes due 2026 as an increase to interest expense approximately $49.2 million (or approximately $4.9 million per year) of the amounts recorded on our consolidated balance sheets within accumulated other comprehensive loss, which represents the effective portion of the applicable interest rate contracts.
Gains on Sales of Real Estate
The gains on sales of real estate may differ between BXP and BPLP as a result of previously applied acquisition accounting by BXP for the issuance of common stockNoncontrolling Interests in connection with non-sponsor OP Unit redemptions by BPLP. This accounting resulted in a step-up of the real estate assets at BXP that was allocated to certain properties. The difference between the real estate assets of BXP as compared to BPLP for certain properties having an allocation of the real estate step-up will result in a corresponding difference in the gains on sales of real estate when those properties are sold. For additional information, see the Explanatory Note that follows the cover page of this Form 10-Q.
Boston Properties, Inc.
Gains on sales of real estate decreased by approximately $10.1 million for the three months ended September 30, 2017 compared to 2016, respectively, as detailed below (dollars in millions):
Name Date Sold Property Type Square Feet Sale Price Cash Proceeds Gain on Sale of Real Estate 
2017             
Reston Eastgate August 30, 2017 Land N/A $14.0
 $13.2
 $2.8
(1)
2016             
Broad Run Business Park August 16, 2016 Land N/A $18.0
 $17.9
 $13.0
 
___________
(1)Excludes approximately $58,000 of a gain on sale of real estate recognized during the three months ended September 30, 2017 related to a previously deferred gain amount from a 2016 sale.
Boston Properties Limited Partnership
Gains on sales of real estate decreased by approximately $10.1 million for the three months ended September 30, 2017 compared to 2016, respectively, as detailed below (dollars in millions):
Name Date Sold Property Type Square Feet Sale Price Cash Proceeds Gain on Sale of Real Estate 
2017             
Reston Eastgate August 30, 2017 Land N/A $14.0
 $13.2
 $2.8
(1)
2016             
Broad Run Business Park August 16, 2016 Land N/A $18.0
 $17.9
 $13.0
 
___________
(1)Excludes approximately $58,000 of a gain on sale of real estate recognized during the three months ended September 30, 2017 related to a previously deferred gain amount from a 2016 sale.
Noncontrolling interests in property partnershipsProperty Partnerships
Noncontrolling interests in property partnerships increased by approximately $31.6$3.4 million for the three months ended September 30, 20172021 compared to 20162020, as detailed below.

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PropertyNoncontrolling Interests in Property Partnerships for the three months ended September 30,
20212020Change
(in thousands)
767 Fifth Avenue (the General Motors Building) (1)$3,406 $2,104 $1,302 
Times Square Tower (1)4,995 3,545 1,450 
601 Lexington Avenue4,436 4,352 84 
100 Federal Street3,421 3,565 (144)
Atlantic Wharf Office Building (2)2,713 1,995 718 
$18,971 $15,561 $3,410 

_______________
(1)The increase was primarily attributable to an increase in lease revenue from our tenants.
Table(2)During the three months ended September 30, 2020, we wrote off approximately $0.5 million of Contentsaccrued rent and accounts receivable balances for retail tenants whose balances we determined were no longer probable of collection. Approximately $0.2 million represents our partners’ share of the write-offs.

Property Noncontrolling Interests in Property Partnerships for the three months ended September 30,
2017 2016 Change
  (in thousands)
Salesforce Tower $(160) $(3) $(157)
767 Fifth Avenue (the General Motors Building) (1) 1,179
 (5,938) 7,117
Times Square Tower 6,741
 6,636
 105
601 Lexington Avenue (2) 3,066
 (21,141) 24,207
100 Federal Street 1,174
 887
 287
Atlantic Wharf Office 2,340
 2,334
 6
  $14,340
 $(17,225) $31,565
___________
(1)
On June 7, 2017, our consolidated entity in which we have a 60% interest completed the refinancing of indebtedness that had been secured by direct and indirect interests in 767 Fifth Avenue. Prior to this quarter, the net loss allocation was primarily due to the partners’ share of the interest expense for the outside members’ notes payable, which was $8.7 million for the three months ended 2016. On June 7, 2017, a portion of the outside members’ notes payable was repaid and the remaining portion was contributed as equity in the consolidated entity (See Notes 5 and 8 to the Consolidated Financial Statements).
(2)On August 19, 2016, the consolidated entity in which we have a 55% interest and that owns this property commenced the redevelopment of the six-story low-rise office and retail building component of the complex. The redeveloped portion of the low-rise building will contain approximately 195,000 net rentable square feet of Class A office space and approximately 25,000 net rentable square feet of retail space. We will capitalize incremental costs during the redevelopment. BXP and BPLP recognized approximately $50.8 million and $47.6 million, respectively, of depreciation expense associated with the acceleration of depreciation on the assets being removed from service and demolished as part of the redevelopment of the property. Approximately $21.4 million of those amounts was allocated to the outside partners.
Noncontrolling Interest—Common Units of Boston Properties Limitedthe Operating Partnership
For BXP, noncontrolling interest–interest—common units of Boston Properties Limitedthe Operating Partnership increased by approximately $4.0$2.0 million for the three months ended September 30, 20172021 compared to 20162020 due primarily to an increase in allocable income partially offset by a decrease in the noncontrolling interest’s ownership percentage.income. Due to our UPREIT ownership structure, there is no corresponding line item on BPLP’s financial statements.
Liquidity and Capital Resources
General
Our principal liquidity needs for the next twelve months and beyond are to:
•fund normal recurring expenses;
•meet debt service and principal repayment obligations, including balloon payments on maturing debt;
•fund development and redevelopment costs;
•fund capital expenditures, including major renovations, tenant improvements and leasing costs;
•fund development costs;pending and possible acquisitions of properties, either directly or indirectly through the acquisition of equity interests therein; and
fund dividend requirements on BXP’s Series B Preferred Stock;
fund possible property acquisitions; and
•make the minimum distribution required to enable BXP to maintain its REIT qualification under the Internal Revenue Code of 1986, as amended.
We expect to satisfy these needs using one or more of the following:
•cash flow from operations;
•distribution of cash flows from joint ventures;
•cash and cash equivalent balances;
issuances of BXP equity securities and/or additional preferred or common units of partnership interest in BPLP;
•borrowings under BPLP’s 20172021 Credit Facility, and other short-term bridge facilities;
facilities and construction loans;
•long-term secured and unsecured indebtedness (including unsecured exchangeable indebtedness); and
•sales of real estate.estate; and

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BXP equity securities and/or preferred or common units of partnership interest in BPLP.
We draw on multiple financing sources to fund our long-term capital needs. OurWe expect to fund our current consolidated development properties are expected to be fundedprimarily with our available cash balances, construction loans and BPLP’s 2017 CreditRevolving Facility. We use BPLP’s 2017 CreditRevolving Facility is utilized primarily as a bridge facility to fund acquisition opportunities, refinance outstanding indebtedness and meet short-term development and working capital needs. Although we may seek to fund our development projects with construction loans, which may require guarantees by BPLP, the financing for each particular project ultimately depends on several factors, including, among others, the project’s size and duration, the extent of pre-leasing and our available cash and access to cost effective capital at the given time.
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The following table presents information on properties under construction and redevelopment as of September 30, 20172021 (dollars in thousands):
Construction
Properties
 
Estimated
Stabilization Date
 Location 
# of
Buildings
 
Estimated
Square
Feet
 
Investment
to Date (1)
 
Estimated
Total
Investment (1)
 
Estimated
Future
Equity
Requirement (1)
 
Percentage
Leased (2)
 
Office and Retail                 
Salesforce Tower (95% ownership) Third Quarter, 2019 San Francisco, CA 1
 1,400,000
 913,515
 1,073,500
 170,160
 87%(3)
The Hub on Causeway (50% ownership) Fourth Quarter, 2019 Boston, MA 1
 385,000
 46,272
 141,870
 —
 42%(4)
145 Broadway Fourth Quarter, 2019 Cambridge, MA 1
 485,000
 70,097
 375,000
 304,903
 98% 
Dock 72 (50% ownership) First Quarter, 2020 Brooklyn, NY 1
 670,000
 70,335
 204,900
 9,565
 33%(5)
6595 Springfield Center Drive (TSA Headquarters) Fourth Quarter, 2020 Springfield, VA 1
 634,000
 34,401
 313,700
 279,299
 98% 
7750 Wisconsin Avenue (Marriott International Headquarters) (50% ownership) Third Quarter, 2022 Bethesda, MD 1
 740,000
 11,206
 211,100
 199,894
 100%(6)
Total Office and Retail Properties under Construction   6
 4,314,000
 1,145,826
 2,320,070
 963,821
 80% 
Residential                 
Proto Kendall Square (280 units) Second Quarter, 2019 Cambridge, MA 1
 149,600
 59,422
 140,170
 80,748
 N/A
 
Proto Kendall Square - Retail     —
 14,400
 —
 —
 —
 15% 
Signature at Reston (508 units) Second Quarter, 2020 Reston, VA 1
 490,000
 171,649
 234,854
 63,205
 N/A
 
Signature at Reston - Retail     —
 24,600
 —
 —
 —
 81% 
MacArthur Station Residences (402 units) Fourth Quarter, 2021 Oakland, CA 1
 324,000
 3,133
 263,600
 260,467
 N/A
(7)
Total Residential Properties under Construction   3
 1,002,600
 234,204
 638,624
 404,420
 57% 
Redevelopment Properties               
191 Spring Street Fourth Quarter, 2018 Lexington, MA 1
 160,000
 30,221
 53,920
 23,699
 49% 
One Five Nine East 53rd Street (55% ownership) Fourth Quarter, 2019 New York, NY —
 220,000
 52,171
 106,000
 53,829
 —%(8)
Total Redevelopment Properties under Construction 1
 380,000
 82,392
 159,920
 77,528
 21% 
Total Properties under Construction and Redevelopment 10
 5,696,600
 $1,462,422
 $3,118,614
 $1,445,769
 75%
Financings
Construction PropertiesEstimated Stabilization DateLocation# of BuildingsEstimated Square FeetInvestment to Date (1)(2)(3)Estimated Total Investment (1)(2)Total Available (1)Outstanding at 9/30/2021 (1)Estimated Future Equity Requirement (1)(2)(4)Percentage Leased (5)
Office
325 Main StreetThird Quarter, 2022Cambridge, MA1 420,000 $283,920 $418,400 $— $— $134,480 90 %
100 Causeway Street (50% ownership)Third Quarter, 2022Boston, MA1 632,000 229,627 267,300 200,000 148,603 — 95 %(6)
7750 Wisconsin Avenue (Marriott International Headquarters) (50% ownership)First Quarter, 2022Bethesda, MD1 734,000 168,945 198,900 127,500 104,036 6,491 100 %(7)
Reston NextFourth Quarter, 2023Reston, VA2 1,062,000 507,726 715,300 — — 207,574 85 %(8)
2100 Pennsylvania AvenueThird Quarter, 2024Washington, DC1 480,000 209,193 356,100 — — 146,907 56 %
Total Office Properties under Construction6 3,328,000 1,399,411 1,956,000 327,500 252,639 495,452 87 %
Lab/Life Sciences
200 West Street (Redevelopment)Fourth Quarter, 2021Waltham, MA— 138,000 29,340 47,800 — — 18,460 100 %(9)
880 Winter Street (Redevelopment)Second Quarter, 2024Waltham, MA1 224,000 6,964 108,000 — — 101,036 23 %
751 Gateway (49% ownership)Third Quarter, 2024South San Francisco, CA1 229,000 28,723 127,600 — — 98,877 — %
180 CityPointFourth Quarter, 2024Waltham, MA1 329,000 41,442 274,700 — — 233,258 — %
Total Lab/Life Sciences Properties under Construction3 920,000 106,469 558,100 — — 451,631 21 %
Other
View Boston Observatory at The Prudential Center (Redevelopment)N/ABoston, MA— 59,000 45,158 182,300 — — 137,142 N/A
Total Properties under Construction9 4,307,000 $1,551,038 $2,696,400 $327,500 $252,639 $1,084,225 72 %(10)
___________  
(1)Represents our share. Includes net revenue during lease up period, acquisition expenses and approximately $64.2 million of construction cost and leasing commission accruals.
(2)Represents percentage leased as of November 2, 2017, including leases with future commencement dates and excluding residential units.
(3)Under the joint venture agreement, if the project is funded with 100% equity, we have agreed to fund 50% of our partner’s equity requirement, structured as preferred equity. We expect to fund approximately $25.4 million at a rate of LIBOR plus 3.0% per annum and receive priority distributions from all distributions to our partner until the principal and interest are repaid. As of September 30, 2017, we had contributed an aggregate of approximately $15.2 million of preferred equity to the venture.

(1)Represents our share.
(2)Investment to Date, Estimated Total Investment and Estimated Future Equity Requirement all include our share of acquisition expenses, as applicable, and reflect our share of the estimated net revenue/expenses that we expect to incur prior to stabilization of the project, including any amounts actually received or paid through September 30, 2021.
(3)Includes approximately $77.8 million of unpaid but accrued construction costs and leasing commissions.
(4)Excludes approximately $77.8 million of unpaid but accrued construction costs and leasing commissions.
(5)Represents percentage leased as of November 2, 2021, including leases with future commencement dates.
(6)This property was 79% placed in-service as of September 30, 2021.
(7)On October 29, 2021, this project was fully placed in-service (See Note 15 to the Consolidated Financial Statements).
(8)On October 19, 2021, approximately 285,000 square feet of the project was placed in-service.
(9)Represents a portion of the property under redevelopment for conversion to laboratory space.
(10)Percentage leased excludes View Boston Observatory at The Prudential Center (redevelopment) at 800 Boylston Street - The Prudential Center.

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(4)This development has a $102.3 million (our share) construction facility. As of September 30, 2017, no amounts have been drawn under this facility.
(5)This development has a $125 million (our share) construction facility. As of September 30, 2017, no amounts have been drawn under this facility.
(6)Rentable square feet is an estimate based on current building design.
(7)This development is subject to a 99-year ground lease (including extension options) with an option to purchase in the future.
(8)The low-rise portion of 601 Lexington Avenue.

Contractual rentalLease revenue (which includes recoveries from tenants,tenants), other income from operations, available cash balances, mortgage financings, unsecured indebtedness and draws on BPLP’s 2017 CreditRevolving Facility are the principal sources of capital that we use to payfund operating expenses, debt service, maintenance and repositioning capital expenditures, tenant improvements and the minimum distribution required to enable BXP to maintain its REIT qualification. We seek to maximize income from our existing properties by maintaining quality standards for our properties that promote high occupancy rates and permit increases in rental rates while reducing tenant turnover and controlling operating expenses. Our sources of revenue also include third-party fees generated by our property management, leasing and development and construction businesses, as well as the sale of assets from time to time. We believe our revenue, together with our cash balances and proceeds from financing activities,these sources of capital will continue to provide the funds necessary for our short-term liquidity needs, including our properties under development and redevelopment.
Material adverse changes in one or more sources of capital, whether due to the impacts of the COVID-19 pandemic or otherwise, may adversely affect our net cash flows. Such changes, in turn, could adversely affect
Leasing activity and revenue from transient parking and our ability to fund operating expenses, dividends and distributions, debt service payments, maintenance and repositioning capital expenditures and tenant improvements. In addition, a material adverse changehotel improved during the third quarter of 2021.We signed approximately 1.4 million square feet of leases in the cash provided byquarter, which represents more than double the leasing volume in the first quarter of 2021 and is approximately 90% of our operations may affect our abilitypre-pandemic average for the third quarter. Our parking and hotel revenue also increased approximately 36% compared to comply with the financial covenants under BPLP’s 2017 Credit Facilitysecond quarter of 2021. We expect parking revenue to continue to improve gradually as the return to in-person work accelerates and unsecured senior notes. hotel occupancy to remain low until the demand for business and leisure travel returns to historical levels.
Our primary uses of capital over the next twelve months will be the completion of our current and committed development and redevelopment projects. projects, servicing the principal and interest payments on our outstanding indebtedness and satisfying our REIT distribution requirements.
As of September 30, 2017, our2021, we had nine properties under development or redevelopment. Our share of the remaining development and redevelopment costs that we expect to fund through 2022 is2024 was approximately $1.4$1.1 billion.
During the third quarter we further enhanced our liquidity through two securedof 2021, BPLP completed a public “green bond” offering of $850.0 million of 2.450% unsecured senior notes due October 2033. The offering marked BPLP’s fourth green bond offering and represented the lowest coupon ever issued by BPLP. The net proceeds from the offering along with available cash and borrowings under BPLP’s Revolving Facility were used to fully redeem the $1.0 billion aggregate principal amount of 3.85% unsecured senior notes that were scheduled to mature in February 2023. The early repayment will result in a loss from early extinguishment of debt financings aggregating $754.6of approximately $43.9 million in gross commitmentsthe fourth quarter of 2021. This amount includes approximately $1.0 million of unamortized financing and other costs.
We have a SCP that provides us the opportunity to partner with large institutional investors and capitalize our investment opportunities partially through private equity. The SCP enhances our access to capital and investment capacity and further enhances our returns through fees paid to us, and in certain partnerships, a greater share of income upon achieving certain success criteria. These large financial partners include some of the world’s largest sovereign wealth funds and pension plans. Our use of the SCP is consistent with our ongoing strategy to create value through opportunistic investments in high-quality office properties in markets with the $550strongest economic growth over time while maintaining a strong balance sheet and modest leverage. As part of the broader SCP, we announced in July 2021 the formation of an investment program with two large partners committing a targeted equity investment of $1.0 billion, including $250 million from us. Under this agreement, we will provide these partners, for up to two years, exclusive first offers to form joint ventures with us to invest in assets that meet the SCP’s target criteria. All investments are discretionary to each partner.
For example, during the third quarter of 2021, we partnered with two SCP partners to acquire Safeco Plaza, a 50-story, approximately 765,000 net rentable square foot, LEED-Platinum certified, Class A office property located in Seattle, Washington. After mortgage financing, placed on Colorado Centerthe partners contributed approximately $215 million to fund the acquisition. Each partner owns approximately a one-third ownership interest in the property (See Note 5 to the Consolidated Financial Statements).
In addition, we expect to acquire 360 Park Avenue South, located in Santa Monica, CaliforniaNew York, New York, for a purchase price of approximately $300 million in the fourth quarter of 2021. At closing, we will assume approximately $202 million of mortgage debt and issue approximately $98 million of OP Units, with a $204.6floor price of $111 per OP Unit. Other than customary closing costs, no cash is required to close the transaction. We expect to fund future investment in this asset through a joint venture with one or more financial partners from the SC Program. There can be no assurance that this acquisition will be consummated on the terms currently contemplated or at all.
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On October 25, 2021, we completed the sale of our 181, 191 and 201 Spring Street properties, located in Lexington, Massachusetts, for a gross sales price of $191.5 million.
We have no debt maturities during the remainder of 2021. We have one loan maturing in 2022 that has an outstanding principal balance of approximately $618.7 million construction commitment collateralized(of which our share is approximately $340.3 million). The loan is secured by our Hub on Causeway development project located601 Lexington Avenue property in Boston, Massachusetts. As a result of the Colorado Center financing theNew York. Our unconsolidated joint venture distributed $502.0 million to the partners,ventures have two loans maturing in 2022, of which our share was $251.0of outstanding principal is approximately $147.0 million. We ownare currently in the market to refinance the 601 Lexington Avenue mortgage. Due to the increase in cash flow from this asset, due in part to the redevelopment completed earlier in 2021, we anticipate increasing the principal amount of the mortgage and reducing the interest rate as part of the refinancing. There can be no assurance that this refinancing will be consummated on the terms currently contemplated or at all.
Although the current and future impact of COVID-19 on our liquidity and capital resources will depend on a 50% interest in Colorado Centerwide range of factors, we believe that our access to capital and our strong liquidity, including the Hub on Causeway joint ventures.
With approximately $486 million of cash and cash equivalents and approximately $2.0$1.2 billion available under the 20172021 Credit Facility and available cash of approximately $362.7 million (of which approximately $122.2 million is attributable to our consolidated joint venture partners), as of November 2, 2017, we have2021, is sufficient capital to complete these projects. We believe that our strong liquidity, including our availability under BPLP’s 2017 Credit Facility, and proceeds from debt financings and asset sales provide sufficient liquidity to fund our remaining capital requirements on existing development and redevelopment projects, repay our maturing indebtedness when due, satisfy our REIT distribution requirements and pursue additionalstill allow us to act opportunistically on attractive investment opportunities. In addition, on June 2, 2017 we renewed BXP’s $600.0 million ATM stock offering program for a period of three years.
We have not sold any shares under this ATM stockBXP’s $600.0 million “at the market” equity offering program.
Given the relatively low interest rates currently available to us in the debt markets, weWe may seek to enhance our liquidity to provide sufficient capacity to meet our debt obligations and to fund our remaining capital requirements on existing development projects, our foreseeable potential development activity, pursue additional attractive investment opportunities and pursue attractive additional investment opportunities.refinance or repay indebtedness. Depending on interest rates and overall conditions in the debt and equity markets, we may decide to access the debteither or both of these markets in advance of the need for the funds. Doing so may result in us carrying additional cash and cash equivalents pending BPLP’sour use of the proceeds, which would increase our net interest expense and it would be dilutive to our earnings by increasing our net interest expense.earnings.
REIT Tax Distribution Considerations
Dividend
BXP as a REIT is subject to a number of organizational and operational requirements, including a requirement that BXP currently distribute at least 90% of its annual taxable income (excluding capital gains and with certain other adjustments). Our policy is for BXP to distribute at least 100% of its taxable income, including capital gains, to avoid paying federal tax. On December 19, 2016, the Board of Directors of BXP increased our regular quarterly dividend to $0.75 per common share beginning with the fourth quarter of 2016. The dividend was paid on January 30, 2017 to shareholders of record as of the close of business on December 30, 2016. Common and LTIP unitholders of limited partnership interest in BPLP as of the close of business on December 30, 2016, received the same total distribution per unit on January 30, 2017.
BXP’s Board of Directors will continue to evaluate BXP’s policy taking into considerationdividend rate in light of our actual and projected taxable income our(including gains on sales), liquidity requirements and other circumstances, thatincluding the BXP’s Boardimpact of Directors may deem relevant from time to time,COVID-19, and there can be no assurance that the future dividends declared by itsBXP’s Board of Directors will not differ materially.

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materially from the current quarterly dividend amount.
Sales
To the extent that we sell assets at a gain and cannot efficiently use the proceeds in a tax deferred manner for either our development activities or attractive acquisitions, BXP would, at the appropriate time, decide whether it is better to declare a special dividend, adopt a stock repurchase program, reduce indebtedness or retain the cash for future investment opportunities. Such a decision will depend on many factors including, among others, the timing, availability and terms of development and acquisition opportunities, our then-current and anticipated leverage, the cost and availability of capital from other sources, the price of BXP’s common stock and REIT distribution requirements. At a minimum, we expect that BXP would distribute at least that amount of proceeds necessary for BXP to avoid paying corporate level tax on the applicable gains realized from any asset sales.
From time to time in select cases, whether due to a change in use, structuring issues to comply with applicable REIT regulations or other reasons, we may sell an asset that is held by a taxable REIT subsidiary (“TRS”). Such a sale by a TRS would be subject to federal and local taxes.
Cash Flow Summary
The following summary discussion of our cash flows is based on the Consolidated Statements of Cash Flows and is not meant to be an all-inclusive discussion of the changes in our cash flows for the periods presented below.
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Cash and cash equivalents wereand cash held in escrows aggregated approximately $0.5$1.1 billion and $0.4$1.8 billion at September 30, 20172021 and 2016,2020, respectively, representing an increasea decrease of approximately $0.1$0.7 billion. The following table sets forth changes in cash flows:
Nine months ended September 30, Nine months ended September 30,
2017 2016 Increase
(Decrease)		20212020Increase (Decrease)
(in thousands)(in thousands)
Net cash provided by operating activities$592,712
 $743,785
 $(151,073)Net cash provided by operating activities$786,859 $782,423 $4,436 
Net cash used in investing activities(622,427) (1,104,384) 481,957
Net cash used in investing activities(998,368)(388,411)(609,957)
Net cash provided by financing activities165,856
 56,204
 109,652
Net cash provided by (used in) financing activitiesNet cash provided by (used in) financing activities(425,899)678,891 (1,104,790)
Our principal source of cash flow is related to the operation of our properties. The averageweighted-average term of our in-place tenant leases, excluding residential units, was approximately 7.5 years as of September 30, 2021, including leases signed by our unconsolidated joint ventures, is approximately 7.2 years with occupancy rates historically in the range of 90%88% to 94%. OurGenerally, our properties generate a relatively consistent stream of cash flow that provides us with resources to pay operating expenses, debt service and fund regular quarterly dividend and distribution payment requirements. In addition, over the past several years, we have raised capital through the sale of some of our properties and through secured and unsecured borrowingsborrowings.
The full extent of the impact of COVID-19 on our business, operations and equity offerings of BXP.financial results will depend on numerous evolving factors that we may not be able to accurately predict. In addition, we cannot predict the impact that COVID-19 will have on our tenants, employees, contractors, lenders, suppliers, vendors and joint venture partners; any material adverse effect on these parties could also have a material adverse effect on us.
Cash is used in investing activities to fund acquisitions, development, net investments in unconsolidated joint ventures and maintenance and repositioning capital expenditures. We selectively invest in new projects that enable us to take advantage of our development, leasing, financing and property management skills and invest in existing buildings to enhance or maintain theirour market position. Cash used in investing activities for the nine months ended September 30, 20172021 consisted primarily of acquisitions of real estate, development projects, building and tenant improvements and capital contributions to unconsolidated joint ventures, partially offset by proceeds from sale of investment in unconsolidated joint ventures. Cash used in investing activities for the nine months ended September 30, 20162020 consisted primarily of acquisitions of real estate, development projects, building and tenant improvements and capital contributions to and distributions from unconsolidated joint ventures, partially offset by the proceeds from the sale of real estate and capital distribution from unconsolidated joint ventures, as detailed below:

 Nine months ended September 30,
 20212020
 (in thousands)
Acquisitions of real estate (1)$(218,679)$(135,698)
Construction in progress (2)(381,104)(358,824)
Building and other capital improvements(103,840)(116,894)
Tenant improvements(218,878)(172,401)
Proceeds from sales of real estate (3)— 505,679 
Capital contributions to unconsolidated joint ventures (4)(95,462)(158,374)
Capital distributions from unconsolidated joint ventures (5)122 55,123 
Proceeds from sale of investment in unconsolidated joint venture (6)17,789 — 
Issuance of note receivable, net (7)— (9,800)
Investments in securities, net1,684 2,778 
Net cash used in investing activities$(998,368)$(388,411)
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Cash used in investing activities changed primarily due to the following:
 Nine months ended September 30,
 2017 2016
 (in thousands)
Acquisitions of real estate (1)$(15,953) $(78,000)
Construction in progress (2)(452,283) (359,716)
Building and other capital improvements(162,395) (81,842)
Tenant improvements(152,749) (167,762)
Proceeds from sales of real estate (3)29,810
 122,750
Proceeds from sales of real estate placed in escrow (3)(29,810) (122,647)
Proceeds from sales of real estate released from escrow (3)16,640
 122,647
Cash released from escrow for investing activities9,638
 6,694
Cash released from escrow for land sale contracts—
 1,403
Cash placed in escrow for investment in unconsolidated joint venture (4)(25,000) —
Capital contributions to unconsolidated joint ventures (5)(89,874) (546,982)
Capital distributions from unconsolidated joint ventures (6)251,000
 —
Investments in securities, net(1,451) (929)
Net cash used in investing activities$(622,427) $(1,104,384)
___________  
(1)On May 15, 2017, we acquired 103 Carnegie Center located in Princeton, New Jersey for a purchase price of approximately $16.0 million in cash, including transaction costs.
(1)On April 22, 2016,August 2, 2021, we acquired 3625-3635 Peterson WayShady Grove Bio+Tech Campus in Rockville, Maryland, for a purchase price, including transaction costs, of approximately $118.5 million in cash. Shady Grove Bio+Tech Campus is an approximately 435,000 net rentable square foot, seven-building office park situated on an approximately 31-acre site.
On June 2, 2021, we acquired 153 & 211 Second Avenue located in Santa Clara, CaliforniaWaltham, Massachusetts for a         purchase price of approximately $78.0$100.2 million in cash. 153 & 211 Second Avenue consists of two life sciences lab buildings totaling approximately 137,000 net rentable square feet.
(2)Construction in progress for the nine months ended September 30, 2017 includes ongoing expenditures associated with Reservoir Place North, 888 Boylston Street and the Prudential Center retail expansion, which were fully placed in-service during the nine months ended September 30, 2017. In addition, we incurred costs associated with our continued development/redevelopment of Salesforce Tower, One Five Nine East 53rd Street (the low-rise portion of 601 Lexington Avenue), 191 Spring Street, 145 Broadway, 6595 Springfield Center Drive, and MacArthur Station Residences, Proto Kendall Square and Signature at Reston residential projects.

On July 31, 2020, we acquired an undivided ownership interest in real property at 759 Harrison Street located in San Francisco, California for a purchase price totaling approximately $2.3 million.
On June 26, 2020, we completed the acquisition of real property at 777 Harrison Street (known as Fourth + Harrison and formerly known as 425 Fourth Street) located in San Francisco, California for a gross purchase price, including entitlements, totaling approximately $140.1 million. Fourth + Harrison is expected to support the development of approximately 804,000 square feet of primarily commercial office space.
(2)Construction in progress for the nine months ended September 30, 20162021 includes ongoing expenditures associated with 601 Massachusetts One Five Nine East 53rd Street, which was completed and fully placed in-service during the nine months ended September 30, 2021. In addition, we incurred costs associated with our continued development/redevelopment of 200 West Street, 325 Main Street, 2100 Pennsylvania Avenue, 804 Carnegie Center, 10Reston Next, 180 CityPoint, Reservoir Place North, 888 Boylston Street and theView Boston Observatory at The Prudential Center retail expansion,and 880 Winter Street.
Construction in progress for the nine months ended September 30, 2020 includes ongoing expenditures associated with 17Fifty Presidents Street, 20 CityPoint and The Skylyne, which were partially or fully placed in-service during the nine months ended September 30, 2016.2020. In addition, we incurred costs associated with our continued development of Salesforce Tower,development/redevelopment of One Five Nine East 53rd Street, (the low-rise portion of 601 Lexington Avenue)Reston Next, 2100 Pennsylvania Avenue, 200 West Street and Proto Kendall Square and Signature at Reston residential projects.325 Main Street.
(3)On April 19, 2017, we completed the sale of an approximately 9.5-acre parcel of land at 30 Shattuck Road located in Andover, Massachusetts for a gross sale price of $5.0 million. Net cash proceeds totaled approximately $5.0 million.
(3)On June 13, 2017,25, 2020, we completed the sale of 40 Shattuck Roada portion of our Capital Gallery property located in Andover, MassachusettsWashington, DC for a gross salesales price of $12.0approximately $253.7 million. Net cash proceeds totaled approximately $11.9 million.$246.6 million, resulting in a gain on sale of real estate totaling approximately $203.6 million for BXP and approximately $207.0 million for BPLP. Capital Gallery is an approximately 631,000 net rentable square foot Class A office property. The portion sold is comprised of approximately 455,000 net rentable square feet of commercial office space. We continue to own the land, underground parking garage and remaining commercial office and retail space containing approximately 176,000 net rentable square feet at the property.
On August 30, 2017,February 20, 2020, we completed the sale of our Reston Eastgate propertyNew Dominion Technology Park located in Reston,Herndon, Virginia for a gross salesales price of $14.0$256.0 million. Net cash proceeds totaled approximately $13.2 million.
On February 1, 2016, we completed the$254.0 million, resulting in a gain on sale of real estate totaling approximately $192.3 million for BXP and approximately $197.1 million for BPLP. New Dominion Technology Park is comprised of two Class A office properties aggregating approximately 493,000 net rentable square feet.
(4)Capital contributions to unconsolidated joint ventures for the nine months ended September 30, 2021 consisted primarily of cash contributions of approximately $72.6 million and $11.4 million to our 415 Main Street propertySafeco Plaza and Santa Monica Business Park joint ventures, respectively. On September 1, 2021, we entered into a new joint venture for Safeco Plaza located in Cambridge, MassachusettsSeattle, Washington (See Note 5 to the tenantConsolidated Financial Statements).
Capital contributions to unconsolidated joint ventures for a gross sale pricethe nine months ended September 30, 2020 consisted primarily of cash contributions of approximately $105.4 million.  Net cash proceeds totaled approximately $104.9 million.$75.0 million, $39.0 million, $27.2 million and $7.5 million to our Platform 16, 3 Hudson Boulevard, Beach Cities Media Center and Metropolitan Square joint ventures, respectively.
On August 16, 2016, we completed the sale of a parcel of land within our Broad Run Business Park property located in Loudoun County, Virginia. Net cash proceeds totaled approximately $17.9 million. The sale of the land parcel was completed as part of a like-kind exchange under Section 1031 of the Internal Revenue Code.
(4)On August 7, 2017, we deposited $25.0 million into an escrow account to be contributed by us to the unconsolidated joint venture that is developing 7750 Wisconsin Avenue to fund future development costs.

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(5)Capital contributions to unconsolidated joint ventures for the nine months ended September 30, 2017 consisted primarily of cash contributions of approximately $34.2 million, $31.7 million and $21.4 million to our Dock 72, Hub on Causeway and 7750 Wisconsin Avenue joint ventures, respectively.
(5)Capital contributions todistributions from unconsolidated joint ventures for the nine months ended September 30, 2016 were primarily due to2020 consisted of cash contributionsdistributions totaling (1) approximately $22.5 million from our Metropolitan Square joint venture resulting from the excess proceeds from the refinancing of the mortgage loan on the property, (2) approximately $505.1$17.9 million $15.3from our Annapolis Junction joint venture resulting from available cash and the
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net proceeds from the sale of Annapolis Junction Building Eight and two land parcels after the pay down of the mortgage loan and (3) approximately $14.0 million $14.5 million and $11.8 million tofrom our Colorado Center Hubjoint venture resulting from the excess proceeds from the mortgage financing on Causeway, Dock72 and 1265 Main Street joint ventures, respectively. the property that occurred during 2017, which proceeds were released from lender reserves.
(6)On July 1, 2016,March 30, 2021, we acquired a 49.8%completed the sale of our 50% ownership interest in Colorado Center.Annapolis Junction NFM LLC (the “Annapolis Junction Joint Venture”) to the joint venture partner for a gross sales price of $65.9 million. Net cash proceeds to us totaled approximately $17.8 million after repayment of our share of debt totaling approximately $15.1 million.
(6)Capital distributions from unconsolidated joint ventures for the nine months ended September 30, 2017 consisted of a cash distribution of $251.0 million from our Colorado Center joint venture resulting from the proceeds of the new mortgage financing.
(7)Issuance of notes receivable, net consisted of the $10.0 million of financing provided to an affiliate of our partner in the joint venture that owns and is developing 7750 Wisconsin Avenue located in Bethesda, Maryland.The financing bears interest at a fixed rate of 8.00% per annum, compounded monthly, and matures on the fifth anniversary of the date on which the base building of the affiliate of our partner’s hotel property is substantially completed.The loan is collateralized by a pledge of the partner’s equity interest in our joint venture that owns and is developing 7750 Wisconsin Avenue.
Cash provided byused in financing activities for the nine months ended September 30, 20172021 totaled approximately $165.9$425.9 million. This amount consisted primarily of (1) the net proceeds fromredemption of BPLP’s $850.0 million in aggregate principal amount of its 4.125% senior notes due 2021, (2) the refinancingrepayment of the 767 Fifth Avenue (the General Motors Building) debt partially offset byDelayed Draw Facility under the 2017 Credit Facility, (3) redemption of the Series B Preferred Stock, (4) payment of our regular dividends and distributions to our shareholders and unitholders. unitholders and (5) distributions to noncontrolling interest holders in property partnership. These decreases were partially offset by the proceeds from the issuance by BPLP of (1) $850.0 million in aggregate principal amount of its 2.550% senior unsecured notes due 2032 and (2) $850.0 million in aggregate principal amount of its 2.450% senior unsecured notes due 2033. Future debt payments are discussed below under the heading “Capitalization—Debt Financing.”
Capitalization
The following table presents Consolidated Market Capitalization and BXP’s Share of Market Capitalization, as well as the corresponding ratios of Consolidated Debt to Consolidated Market Capitalization and BXP’s Share of Debt to BXP’s Share of Market Capitalization (dollars in thousands)(in thousands except for percentages):
 September 30, 2017 September 30, 2021
 Shares / Units Outstanding Common Stock Equivalent Equivalent Value (1) Shares / Units OutstandingCommon Stock EquivalentEquivalent Value (1)
Common Stock 154,322,266
 154,322,266
 $18,963,120
 Common Stock156,206 156,206 $16,924,920 
Common Operating Partnership Units 17,629,311
 17,629,311
 2,166,290
(2)Common Operating Partnership Units17,477 17,477 1,893,633 (2)
5.25% Series B Cumulative Redeemable Preferred Stock (non-callable until March 27, 2018) 80,000
 —
 200,000
 
Total Equity   171,951,577
 $21,329,410
 Total Equity173,683 $18,818,553 
       
Consolidated Debt   

 $10,234,634
 Consolidated Debt$13,378,350 
Add: 
     Add:
BXP’s share of unconsolidated joint venture debt (3)     591,622
 BXP’s share of unconsolidated joint venture debt (3)1,289,582 
Subtract:       Subtract:
Partners’ share of Consolidated Debt (4)     (1,210,389) Partners’ share of Consolidated Debt (4)(1,190,479)
BXP’s Share of Debt     $9,615,867
 BXP’s Share of Debt$13,477,453 
       
Consolidated Market Capitalization     $31,564,044
 Consolidated Market Capitalization$32,196,903 
BXP’s Share of Market Capitalization     $30,945,277
 BXP’s Share of Market Capitalization$32,296,006 
Consolidated Debt/Consolidated Market Capitalization     32.42% Consolidated Debt/Consolidated Market Capitalization41.55 %
BXP’s Share of Debt/BXP’s Share of Market Capitalization     31.07% BXP’s Share of Debt/BXP’s Share of Market Capitalization41.73 %
_______________  
(1)Except for the Series B Cumulative Redeemable Preferred Stock, which is valued at the liquidation preference of $2,500.00 per share, values are based on the closing price per share of BXP’s Common Stock on September 30, 2017 of $122.88.
(2)Includes 816,982 long-term incentive plan units (including 118,067 2012 OPP Units, 85,405 2013 MYLTIP Units and 25,107 2014 MYLTIP Units), but excludes an aggregate of 1,239,978 MYLTIP Units granted between 2015 and 2017.
(3)See page 83 for additional information.
(4)See page 82 for additional information.

(1)Values are based on the closing price per share of BXP’s Common Stock on the New York Stock Exchange on September 30, 2021 of $108.35.
(2)Includes long-term incentive plan units (including 2012 OPP Units and 2013 - 2018 MYLTIP Units) but excludes MYLTIP Units granted between 2019 and 2021 because the three-year performance period has not ended.
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(3)See page 92 for additional information.
(4)See page 91 for additional information.

Consolidated Debt to Consolidated Market Capitalization Ratio is a measure of leverage commonly used by analysts in the REIT industry.sector. We present this measure as a percentage and it is calculated by dividing (A) our consolidated debt by (B) our consolidated market capitalization, which is the market value of our outstanding equity securities plus our consolidated debt. Consolidated market capitalization is the sum of:

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(1)     our consolidated debt; plus
(2)     the product of (x) the closing price per share of BXP common stock on September 30, 2017,2021, as reported by the New York Stock Exchange, multiplied by (y) the sum of:
(i)
(i)     the number of outstanding shares of common stock of BXP,
(ii)the number of outstanding OP Units in BPLP (excluding OP Units held by BXP),
(iii)the number of OP Units issuable upon conversion of all outstanding LTIP Units, assuming all conditions have been met for the conversion of the LTIP Units, and
(iv)the number of OP Units issuable upon conversion of 2012 OPP Units, 2013 MYLTIP Units and 2014 MYLTIP Units that were issued in the form of LTIP Units; plus
(3)     the aggregate liquidation preference ($2,500 per share) of the outstanding shares of BXP’s 5.25% Series B Cumulative Redeemable Preferred Stock.common stock of BXP,
(ii)     the number of outstanding OP Units in BPLP (excluding OP Units held by BXP),
(iii)     the number of OP Units issuable upon conversion of all outstanding LTIP Units, assuming all conditions have been met for the conversion of the LTIP Units, and
(iv)     the number of OP Units issuable upon conversion of 2012 OPP Units, 2013 - 2018 MYLTIP Units that were issued in the form of LTIP Units.
The calculation of consolidated market capitalization does not include LTIP Units issued in the form of MYLTIP Awards unless and until certain performance thresholds are achieved and they are earned. Because their three-year performance periods have not yet ended, 2015, 2016 and 20172019 - 2021 MYLTIP Units are not included in this calculation as of September 30, 2017.2021.
We also present BXP’s Share of Market Capitalization and BXP’s Share of Debt/BXP’s Share of Market Capitalization, which isare calculated in the same manner, except that BXP’s Share of Debt is utilized instead of our consolidated debt in both the numerator and the denominator. BXP’s Share of Debt is defined as our consolidated debt plus our share of debt from our unconsolidated joint ventures (calculated based upon our ownership percentage), minus our partners’ share of debt from our consolidated joint ventures (calculated based upon the partners’ percentage ownership interests)interests adjusted for basis differentials). Management believes that BXP’s Share of Debt provides useful information to investors regarding our financial condition because it includes our share of debt from unconsolidated joint ventures and excludes our partners’ share of debt from consolidated joint ventures, in each case presented on the same basis. We have several significant joint ventures and presenting various measures of financial condition in this manner can help investors better understand our financial condition and/or results of operations after taking into account our economic interest in these joint ventures.  We caution investors that the ownership percentages used in calculating BXP’s Share of Debt may not completely and accurately depict all of the legal and economic implications of holding an interest in a consolidated or unconsolidated joint venture. For example, in addition to partners’ interests in profits and capital, venture agreements vary in the allocation of rights regarding decision making (both for routine and major decisions), distributions, transferability of interests, financing and guarantees, liquidations and other matters.  Moreover, in some cases we exercise significant influence over, but do not control, the joint venture in which case GAAP requires that we account for the joint venture entity using the equity method of accounting and we do not consolidate it for financial reporting purposes. In other cases, GAAP requires that we consolidate the venture even though our partner(s) own(s) a significant percentage interest.  As a result, presentationsmanagement believes that the presentation of BXP’s Share of a financial measure should not be considered a substitute for, and should only be considered with and as a supplement to our financial information presented in accordance with GAAP.
We present these supplemental ratios because our degree of leverage could affect our ability to obtain additional financing for working capital, capital expenditures, acquisitions, development or other general corporate purposes and because different investors and lenders consider one or both of these ratios. Investors should understand that these ratios are, in part, a function of the market price of the common stock of BXP and as such will fluctuate with changes in such price, and they do not necessarily reflect our capacity to incur additional debt to finance our activities or our ability to manage our existing debt obligations. However, for a company like BXP, whose assets are primarily income-producing real estate, these ratios may provide investors with an alternate indication of leverage, so long as they are evaluated along with the ratio of indebtedness to other measures of asset
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value used by financial analysts and other financial ratios, as well as the various components of our outstanding indebtedness.
For a discussion of our unconsolidated joint venture indebtedness, see “Liquidity and Capital Resources—Capitalization—Off-Balance Sheet Arrangements—Joint Venture Indebtedness” within “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations” and for a discussion of our consolidated joint venture indebtedness see “Liquidity and Capital Resources—Capitalization—Mortgage Notes Payable Net” within “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”
Debt Financing
As of September 30, 2017,2021, we had approximately $10.2$13.4 billion of outstanding consolidated indebtedness, representing approximately 32.42%41.55% of our Consolidated Market Capitalization as calculated above consisting of approximately (1) $7.3$10.5 billion (net of discount and deferred financing fees) in publicly traded unsecured senior notes having a GAAP weighted-average interest rate of 4.21%3.48% per annum and

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maturities in 20182023 through 2026;2033 and (2) $3.0$2.9 billion (net of deferred financing fees) of property-specific mortgage debt having a GAAP weighted-average interest rate of 3.96%3.89% per annum and a weighted-average term of 8.44.6 years.
The table below summarizes the aggregate carrying value of our mortgage notes payable, mezzanine notes payable and outside members’ notes payable and BPLP’s unsecured senior notes, line of credit and term loan, as well as Consolidated Debt Financing Statistics at September 30, 20172021 and September 30, 2016. Because the outside members’ notes payable are allocated to the partners, they are not included in the Consolidated Debt Financing Statistics.
2020.
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 September 30,
 2017 2016
 (dollars in thousands)
Debt Summary:   
Balance   
Fixed rate mortgage notes payable, net$2,982,067
 $2,077,707
Unsecured senior notes, net7,252,567
 7,243,767
Unsecured line of credit—
 —
Unsecured term loan—
 —
Mezzanine notes payable—
 307,448
Outside members’ notes payable—
 180,000
Consolidated Debt10,234,634
 9,808,922
Add:   
BXP’s share of unconsolidated joint venture debt (1)591,622
 350,225
Subtract:   
Partners’ share of consolidated mortgage notes payable, net (2)(1,210,389) (847,483)
Partners’ share of consolidated mezzanine notes payable—
 (122,979)
Outside members’ notes payable—
 (180,000)
BXP’s Share of Debt$9,615,867
 $9,008,685
    
 September 30,
 2017 2016
Consolidated Debt Financing Statistics:   
Percent of total debt:   
Fixed rate100.00% 100.00%
Variable rate—% —%
Total100.00% 100.00%
GAAP Weighted-average interest rate at end of period:   
Fixed rate4.13% 4.06%
Variable rate—% —%
Total4.13% 4.06%
Coupon/Stated Weighted-average interest rate at end of period:   
Fixed rate4.02% 4.50%
Variable rate—% —%
Total4.02% 4.50%
Weighted-average maturity at end of period (in years):   
Fixed rate6.1
 5.2
Variable rate—
 —
Total6.1
 5.2
_______________  
(1)See page 83 for additional information.
(2)See page 82 for additional information.

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September 30,
20212020
 (dollars in thousands)
Debt Summary:
Balance
Fixed rate mortgage notes payable, net$2,898,699 $2,912,494 
Unsecured senior notes, net10,479,651 9,636,397 
Unsecured line of credit— — 
Unsecured term loan, net— 499,270 
Consolidated Debt13,378,350 13,048,161 
Add:
BXP’s share of unconsolidated joint venture debt, net (1)1,289,582 1,114,031 
Subtract:
Partners’ share of consolidated mortgage notes payable, net (2)(1,190,479)(1,195,957)
BXP’s Share of Debt$13,477,453 $12,966,235 
September 30,
20212020
Consolidated Debt Financing Statistics:
Percent of total debt:
Fixed rate100.00 %96.17 %
Variable rate— %3.83 %
Total100.00 %100.00 %
GAAP Weighted-average interest rate at end of period:
Fixed rate3.57 %3.75 %
Variable rate— %1.18 %
Total3.57 %3.65 %
Coupon/Stated Weighted-average interest rate at end of period:
Fixed rate3.47 %3.65 %
Variable rate— %1.09 %
Total3.47 %3.55 %
Weighted-average maturity at end of period (in years):
Fixed rate5.9 5.8 
Variable rate— 1.6 
Total5.9 5.6 
_______________
(1)See page 92 for additional information.
(2)See page 91 for additional information.
Unsecured Credit Facility
On April 24, 2017,March 16, 2021, BPLP entered intorepaid $500.0 million, representing all amounts outstanding, on the Delayed Draw Facility under the 2017 Credit Facility. We recognized a loss from early extinguishment of debt totaling approximately $0.5 million, related to unamortized financing costs.
On June 15, 2021, BPLPamended and restated the 2017 Credit Facility and entered into the 2021 Credit Facility. The 2021 Credit Facility provides for borrowings of up to $1.5 billion through the Revolving Facility, subject to customary conditions. Among other things, the 2017 Credit Facilityamendment and restatement (1) increased the total commitment of the Revolving Facility from $1.0 billion to $1.5 billion, (2) extended the maturity date from July 26, 2018 to April 24, 2022,June 15, 2026, (2) eliminated the $500.0 million Delayed Draw Facility provided under the 2017 Credit Facility, (3) reduced the per annum variable interest rates on borrowings and (4) added a sustainability-linked pricing component. Under the 2021 Credit Facility, BPLP may increase the total commitment by up to $500.0 million by
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increasing the amount of the Revolving Facility and/or by incurring one or more term loans, in each case, subject to syndication of the increase and other conditions (See Note 8 to the Consolidated Financial Statements).
The 2021 Credit Facility replaces the 2017 Credit Facility, which consisted of a $1.5 billion unsecured revolving line of credit and a $500.0 million Delayed Draw Facility, that permits BPLPand was scheduled to draw until the first anniversary of the closing date. Basedexpire on BPLP’s current credit rating, (1) the applicable Eurocurrency margins for the Revolving Facility and Delayed Draw Facility are 87.5 basis points and 95 basis points, respectively, and (2) the facility fee on the Revolving Facility commitment is 0.15% per annum. The Delayed Draw Facility has a fee on unused commitments equal to 0.15% per annum (See Note 5 to the Consolidated Financial Statements).April 24, 2022.
As of September 30, 2017 and November 2, 2017, we2021, BPLP had no borrowings under its 2021 Credit Facility and outstanding letters of credit totaling approximately $1.6$6.3 million, outstanding under the 2017 Credit Facility, with the ability to borrow approximately $2.0$1.5 billion. As of November 2, 2021, BPLP had $310.0 million of borrowings under its 2021 Credit Facility and outstanding letters of credit totaling approximately $6.3 million, with the ability to borrow approximately $1.2 billion.
Unsecured Senior Notes Net
The following summarizes theFor a description of BPLP’s outstanding unsecured senior notes outstanding as of September 30, 2017 (dollars2021, see Note 7 to the Consolidated Financial Statements.
On February 14, 2021, BPLP completed the redemption of $850.0 million in thousands):aggregate principal amount of its 4.125% senior notes due May 15, 2021. The redemption price was approximately $858.7 million, which was equal to the stated principal plus approximately $8.7 million of accrued and unpaid interest to, but not including, the redemption date. Excluding the accrued and unpaid interest, the redemption price was equal to the principal amount being redeemed. We recognized a loss from early extinguishment of debt totaling approximately $0.4 million, related to unamortized origination costs.
On March 16, 2021, BPLP completed a public offering of $850.0 million in aggregate principal amount of its 2.550% unsecured senior notes due 2032. The notes were priced at 99.570% of the principal amount to yield an effective rate (including financing fees) of approximately 2.671% per annum to maturity. The notes will mature on April 1, 2032, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $839.2 million after deducting underwriting discounts and transaction expenses.
 
Coupon/
Stated Rate
 
Effective
Rate(1)
 
Principal
Amount
 Maturity Date(2)
7 Year Unsecured Senior Notes3.700% 3.853% $850,000
 November 15, 2018
10 Year Unsecured Senior Notes5.875% 5.967% 700,000
 October 15, 2019
10 Year Unsecured Senior Notes5.625% 5.708% 700,000
 November 15, 2020
10 Year Unsecured Senior Notes4.125% 4.289% 850,000
 May 15, 2021
11 Year Unsecured Senior Notes3.850% 3.954% 1,000,000
 February 1, 2023
10.5 Year Unsecured Senior Notes3.125% 3.279% 500,000
 September 1, 2023
10.5 Year Unsecured Senior Notes3.800% 3.916% 700,000
 February 1, 2024
10 Year Unsecured Senior Notes3.650% 3.766% 1,000,000
 February 1, 2026
10 Year Unsecured Senior Notes2.750% 3.495% 1,000,000
 October 1, 2026
Total principal    7,300,000
  
Net unamortized discount    (16,810)  
Deferred financing costs, net    (30,623)  
Total    $7,252,567
  
On September 29, 2021, BPLP completed a public offering of $850.0 million in aggregate principal amount of its 2.450% unsecured senior notes due 2033. The notes were priced at 99.959% of the principal amount to yield an effective rate (including financing fees) of approximately 2.524% per annum to maturity. The notes will mature on October 1, 2033, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $842.5 million after deducting underwriting discounts and transaction expenses.
_______________On October 15, 2021, BPLP used available cash and funds under its 2021 Credit Facility to complete the redemption of $1.0 billion in aggregate principal amount of its 3.85% senior notes due February 1, 2023. The redemption price was approximately $1.05 billion, which included approximately $7.9 million of accrued and unpaid interest to, but not including, the redemption date and an early redemption premium and unamortized financing costs totaling approximately $43.9 million.
(1)Yield on issuance date including the effects of discounts on the notes, settlements of interest rate contracts and the amortization of financing costs.
(2)
No principal amounts are due prior to maturity.
The indenture relating to the unsecured senior notes contains certain financial restrictions and requirements, including (1) a leverage ratio not to exceed 60%, (2) a secured debt leverage ratio not to exceed 50%, (3) an interest coverage ratio of greater than 1.50, and (4) an unencumbered asset value of not less than 150% of unsecured debt. At September 30, 2017,2021, BPLP was in compliance with each of these financial restrictions and requirements.

81


Mortgage Notes Payable Net
The following represents the outstanding principal balances due under the mortgage notes payable at September 30, 2017:2021:
PropertiesStated Interest RateGAAP Interest Rate (1)Stated Principal AmountDeferred Financing Costs, NetCarrying Amount
Carrying Amount (Partners’ Share)
Maturity Date
 (dollars in thousands)
Consolidated Joint Ventures
767 Fifth Avenue (the General Motors Building)3.43 %3.64 %$2,300,000 $(19,857)$2,280,143 $912,128 (2)(3)(4)June 9, 2027
601 Lexington Avenue4.75 %4.79 %618,725 (169)618,556 278,351 (5)April 10, 2022
Total$2,918,725 $(20,026)$2,898,699 $1,190,479 
91
Properties 
Stated
Interest Rate
 
GAAP
Interest Rate(1)
 
Stated
Principal
Amount
 Deferred Financing Costs, Net 
Carrying
Amount
 
Carrying Amount (partners’ share)
   Maturity Date
  (dollars in thousands)
Wholly-owned            
New Dominion Tech Park, Bldg. One 7.69% 7.84% $32,944
 $(274) $32,670
 N/A
    January 15, 2021
University Place 6.94% 6.99% 7,896
 (49) 7,847
 N/A
    August 1, 2021
      40,840
 (323) 40,517
 N/A
    
Consolidated Joint Ventures            
767 Fifth Avenue (the General Motors Building) 3.43% 3.64% 2,300,000
 (33,829) 2,266,171
 906,468
 (2)(3)(4) June 9, 2027
601 Lexington Avenue 4.75% 4.79% 676,885
 (1,506) 675,379
 303,921
 (5) April 10, 2022
      2,976,885
 (35,335) 2,941,550
 1,210,389
    
Total     $3,017,725
 $(35,658) $2,982,067
 $1,210,389
     
Table of Contents
_______________ 
(1)GAAP interest rate differs from the stated interest rate due to the inclusion of the amortization of financing charges and the effects of hedging transactions.
(2)The mortgage loan requires interest only payments with a balloon payment due at maturity.
(3)This property is owned by a consolidated entity in which we have a 60% interest.
(4)In connection with the refinancing of the loan, we guaranteed the consolidated entity’s obligation to fund various reserves for tenant improvement costs and allowances, leasing commissions and free rent obligations in lieu of cash deposits. As of September 30, 2017, the maximum funding obligation under the guarantee was approximately $222.7 million. We earn a fee from the joint venture for providing the guarantee and have an agreement with our partners to reimburse the joint venture for their share of any payments made under the guarantee (See Notes 5 and 7 to the Consolidated Financial Statements).
(5)This property is owned by a consolidated entity in which we have a 55% interest.
(1)GAAP interest rate differs from the stated interest rate due to the inclusion of the amortization of financing charges and the effects of hedging transactions (if any).
(2)The mortgage loan requires interest only payments with a balloon payment due at maturity.
(3)This property is owned by a consolidated entity in which we have a 60% interest. The partners’ share of the carrying amount has been adjusted for basis differentials.
(4)In connection with the refinancing of the loan, we guaranteed the consolidated entity’s obligation to fund various reserves for tenant improvement costs and allowances, leasing commissions and free rent obligations in lieu of cash deposits. As of September 30, 2021, the maximum funding obligation under the guarantee was approximately $20.3 million. We earn a fee from the joint venture for providing the guarantee and have an agreement with our partners to reimburse the joint venture for their share of any payments made under the guarantee (See Note 9 to the Consolidated Financial Statements).
(5)This property is owned by a consolidated entity in which we have a 55% interest.
Off-Balance Sheet Arrangements—Joint Venture Indebtedness
We have investments in unconsolidated joint ventures with our effective ownership interests ranging from 20% to 60%55%. TenFourteen of these ventures have mortgage indebtedness. We exercise significant influence over, but do not control, these entities and therefore they are presently accountedentities. As a result, we account for them using the equity method of accounting. See also Note 45 to the Consolidated Financial Statements. At September 30, 2017,2021, the aggregate carrying amount of debt, including both our and our partners’ share, incurred by these ventures was approximately $1.4$3.0 billion (of which our proportionate share is approximately $591.6 million)$1.3 billion). The table below summarizes the outstanding debt of these joint venture properties at September 30, 2017.2021. In addition to other guarantees specifically noted in the table, we have agreed to customary environmental indemnifications and nonrecourse carve-outs (e.g., guarantees against fraud, misrepresentation and bankruptcy) as well as the completion of development projects on certain of the loans.
PropertiesNominal % OwnershipStated Interest RateGAAP Interest Rate (1)Stated Principal AmountDeferred Financing Costs, NetCarrying AmountCarrying Amount (Our share) Maturity Date
 (dollars in thousands)
Santa Monica Business Park55.00 %4.06 %4.24 %$300,000 $(2,003)$297,997 $163,899 (2)(3)July 19, 2025
Market Square North50.00 %2.80 %2.96 %125,000 (848)124,152 62,076 (2)(4)November 10, 2025
1265 Main Street50.00 %3.77 %3.84 %36,694 (285)36,409 18,204 January 1, 2032
Colorado Center50.00 %3.56 %3.58 %550,000 (602)549,398 274,699 (2)August 9, 2027
Dock 7250.00 %3.10 %3.32 %196,412 (1,178)195,234 97,617 (2)(5)December 18, 2023
The Hub on Causeway - Podium50.00 %2.34 %2.50 %174,329 (561)173,768 86,884 (2)(6)September 6, 2023
Hub50House50.00 %2.08 %2.37 %176,468 (297)176,171 88,085 (2)(7)April 19, 2022
100 Causeway Street50.00 %1.59 %1.81 %297,206 (1,624)295,582 147,791 (2)(8)September 5, 2023
7750 Wisconsin Avenue (Marriott International Headquarters)50.00 %1.34 %1.88 %208,071 (2,204)205,867 102,933 (2)(9)April 26, 2023
Safeco Plaza33.67 %2.35 %2.50 %250,000 (1,798)248,202 83,570 (2)(10)September 1, 2026
500 North Capitol Street, NW30.00 %4.15 %4.20 %105,000 (99)104,901 31,470 (2)June 6, 2023
901 New York Avenue25.00 %3.61 %3.69 %217,851 (581)217,270 54,318   January 5, 2025
3 Hudson Boulevard25.00 %3.59 %3.67 %80,000 (112)79,888 19,972 (2)(11)July 13, 2023
Metropolitan Square20.00 %5.40 %6.90 %294,073 (3,751)290,322 58,064 (2)(12)July 7, 2022
Total$3,011,104 $(15,943)$2,995,161 $1,289,582   

_______________
(1)GAAP interest rate differs from the stated interest rate due to the inclusion of the amortization of financing charges, which includes mortgage recording fees.
(2)The loan requires interest only payments with a balloon payment due at maturity.
82
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(3)The loan bears interest at a variable rate equal to LIBOR plus 1.28% per annum and matures on July 19, 2025. A subsidiary of the joint venture entered into interest rate swap contracts with notional amounts aggregating $300.0 million through April 1, 2025, resulting in a fixed rate of approximately 4.063% per annum through the expiration of the interest rate swap contracts.
(4)The loan bears interest at a variable rate equal to (1) the greater of (x) LIBOR or (y) 0.50%, plus (2) 2.30% per annum and matures on November 10, 2025, with one, one-year extension option, subject to certain conditions.
Properties 
Venture
Ownership
%
 
Stated
Interest
Rate
 
GAAP
Interest
Rate (1)
 Stated Principal Amount Deferred Financing Costs, Net Carrying Amount Carrying Amount (Our Share)   Maturity Date
  (dollars in thousands)
540 Madison Avenue 60% 2.73% 2.90% $120,000
 $(187) $119,813
 $71,888
 (2)(3) June 5, 2018
Market Square North 50% 5.75% 5.81% 121,707
 (252) 121,455
 60,727
    October 1, 2020
Annapolis Junction Building One 50% 6.99% 7.16% 39,549
 (41) 39,508
 19,751
 (4) March 31, 2018
Annapolis Junction Building Six 50% 3.49% 3.66% 13,751
 (39) 13,712
 6,856
 (5) November 17, 2018
Annapolis Junction Building Seven and Eight 50% 3.58% 3.86% 36,260
 (223) 36,037
 18,019
 (6) December 7, 2019
1265 Main Street 50% 3.77% 3.84% 39,910
 (396) 39,514
 19,757
   January 1, 2032
Colorado Center 50% 3.56% 3.58% 550,000
 (992) 549,008
 274,504
 (2) August 9, 2027
Dock 72 50% N/A
 N/A
 —
 —
 —
 —
 (2)(7) December 18, 2020
The Hub on Causeway - Podium 50% N/A
 N/A
 —
 —
 —
 —
 (2)(8) September 6, 2021
500 North Capitol Street 30% 4.15% 4.20% 105,000
 (335) 104,665
 31,399
 (2) June 6, 2023
901 New York Avenue 25% 3.61% 3.69% 225,000
 (1,295) 223,705
 55,926
    January 5, 2025
Metropolitan Square 20% 5.75% 5.81% 164,240
 (256) 163,984
 32,795
    May 5, 2020
Total       $1,415,417
 $(4,016) $1,411,401
 $591,622
     
(5)The construction financing has a borrowing capacity of $250.0 million. The construction financing bears interest at a variable rate equal to (1) the greater of (x) LIBOR or (y) 0.25%, plus (2) 2.85% per annum and matures on December 18, 2023.
_______________  
(1)GAAP interest rate differs from the stated interest rate due to the inclusion of the amortization of financing charges.
(2)The loan requires interest only payments with a balloon payment due at maturity.
(3)Mortgage loan bears interest at a variable rate equal to LIBOR plus 1.50% per annum.
(4)On April 11, 2016, a notice of event of default was received from the lender because the loan to value ratio is not in compliance with the applicable covenant in the loan agreement. On October 17, 2016, the lender notified the joint venture that it has elected to charge the default rate on the loan. The default rate is defined as LIBOR plus 5.75% per annum. Subsequently, the cash flows generated from the property have become insufficient to fund debt service payments and capital improvements necessary to lease and operate the property and the joint venture is not prepared to fund additional cash shortfalls at this time. Consequently, the joint venture is not current on making debt service payments and remains in default. The loan has one, three-year extension option, subject to certain conditions including that no event of default exists or is ongoing.
(5)The loan bears interest at a variable rate equal to LIBOR plus 2.25% per annum.
(6)The loan bears interest at a variable rate equal to LIBOR plus 2.35% per annum and matures on December 7, 2019, with three, one-year extension options, subject to certain conditions.
(7)No amounts have been drawn under the $250.0 million construction facility. The construction financing bears interest at a variable rate equal to LIBOR plus 2.25% per annum and matures on December 18, 2020 with two, one-year extension option, subject to certain conditions.
(8)No amounts have been drawn under the $204.6 million construction facility. The construction financing bears interest at a variable rate equal to LIBOR plus 2.25% per annum and matures on September 6, 2021, with two, one-year extension options, subject to certain conditions. In connection with the construction financing, we obtained the right to complete the construction of the garage underneath the project being developed by an affiliate of our joint venture partner and obtain funding from the garage construction lender.  We agreed to guaranty completion of the garage to the construction lender and an affiliate of our partner agreed to reimburse us for our partner’s share of any payments under the guaranty.

(6)The construction financing had a borrowing capacity of $204.6 million. On September 16, 2019, the joint venture paid down the construction loan principal balance in the amount of approximately $28.8 million, reducing the borrowing capacity to $175.8 million. The construction financing bears interest at a variable rate equal to LIBOR plus 2.25% per annum and matures on September 6, 2023.
83(7)The construction financing has a borrowing capacity of $180.0 million. The construction financing bears interest at a variable rate equal to LIBOR plus 2.00% per annum and matures on April 19, 2022, with two, one-year extension options, subject to certain conditions.

Table(8)The construction financing has a borrowing capacity of Contents
$400.0 million. The construction financing bears interest at a variable rate equal to LIBOR plus 1.50% per annum (LIBOR plus 1.375% per annum upon stabilization, as defined in the loan agreement) and matures on September 5, 2023, with two, one-year extension options, subject to certain conditions.

(9)The construction financing has a borrowing capacity of $255.0 million. The construction financing bears interest at a variable rate equal to LIBOR plus 1.25% per annum and matures on April 26, 2023, with two, one-year extension options, subject to certain conditions.
(10)The loan bears interest at a variable rate equal to the greater of (x) 2.35% or (y) LIBOR plus 2.20% per annum and matures on September 1, 2026.
(11)We provided $80.0 million of mortgage financing to the joint venture. The loan bears interest at a variable rate equal to LIBOR plus 3.50% per annum and matures on July 13, 2023, with extension options, subject to certain conditions. The loan has been reflected as Related Party Note Receivable, Net on our Consolidated Balance Sheets. As of September 30, 2021, the loan has approximately $13.1 million of accrued interest due at the maturity date.
(12)The loan bears interest at a variable rate equal to (1) the greater of (x) LIBOR or (y) 0.65%, plus (2) 4.75% per annum and matures on July 7, 2022 with two, one-year extension options, subject to certain conditions. The joint venture entered into an interest rate cap agreement with a financial institution to limit its exposure to increases in the LIBOR rate at a cap of 3.00% per annum on a notional amount of $325.0 million through July 7, 2022.
State and Local Tax Matters
Because BXP is organized and qualifies as a REIT, it is generally not subject to federal income taxes, but it is subject to certain state and local taxes. In the normal course of business, BXP, BPLP and certain entities through which we own real estate either have undergone, or are currently undergoing, tax audits or other inquiries. Although we believe that we have substantial arguments in favor of our positionsposition in the ongoing audits, in some instances there is no controlling precedent or interpretive guidance on the specific point at issue. Collectively, tax deficiency notices received to date from the jurisdictions conducting the ongoing audits have not been material. However, there can be no assurance that future audits will not occur with increased frequency or that the ultimate result of such audits will not have a material adverse effect on our results of operations.
Insurance
We carry insurance coverage on our properties of types and in amounts and with deductibles that we believe are in line with coverage customarily obtained by owners of similar properties. For additional information concerning our insurance program, see Note 79 to the Consolidated Financial Statements.
Funds from Operations
Pursuant to the revised definition of Funds from Operations adopted by the Board of Governors of the National Association of Real Estate Investment Trusts (“NAREIT”Nareit”), we calculate Funds from Operations, or “FFO,” for each of BXP and BPLP by adjusting net income (loss) attributable to Boston Properties, Inc. common shareholders and net income (loss) attributable to Boston Properties Limited Partnership common unitholders respectively, (computed in accordance with GAAP), respectively, for gains (or losses) from sales of properties, impairment losses on depreciable real estate consolidated on our balance sheet, impairment losses on our investments in unconsolidated joint ventures driven by a measurable decrease in the fair value of depreciable real estate held by the unconsolidated joint ventures and our share of real estate-related depreciation and amortization. FFO is a non-GAAP financial measure, but wemeasure. We believe the presentation of FFO, combined with the presentation of required GAAP financial measures, has improvedimproves the understanding of operating results of REITs among the investing public and has helpedhelps make comparisons
93
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of REIT operating results more meaningful. Management generally considers FFO to be useful measures for understanding and comparing our operating results because, by excluding gains and losses related to sales of previously depreciated operating real estate assets, impairment losses and real estate asset depreciation and amortization (which can differ across owners of similar assets in similar condition based on historical cost accounting and useful life estimates), FFO can help investors compare the operating performance of a company'scompany’s real estate across reporting periods and to the operating performance of other companies.
Our computation of FFO may not be comparable to FFO reported by other REITs or real estate companies that do not define the term in accordance with the current NAREITNareit definition or that interpret the current NAREITNareit definition differently. We believe that in order to facilitate a clear understanding of our operating results, FFO should be examined in conjunction with net income attributable to Boston Properties, Inc. common shareholders and net income attributable to Boston Properties Limited Partnership as presented in our Consolidated Financial Statements. FFO should not be considered as a substitute for net income attributable to Boston Properties, Inc. common shareholders or net income attributable to Boston Properties Limited Partnership common unitholders (determined in accordance with GAAP) or any other GAAP financial measures and should only be considered together with and as a supplement to our financial information prepared in accordance with GAAP.


84


operations is discussed throughout this report. The full extent of the impact of COVID-19 on our business, operations and financial results will depend on numerous evolving factors that we may not be able to accurately predict.
Boston Properties, Inc.
The following table presents a reconciliation of net income attributable to Boston Properties, Inc. common shareholders to FFO attributable to Boston Properties, Inc. common shareholders for the three months ended September 30, 20172021 and 2016:2020:
 Three months ended September 30,
20212020
(in thousands)
Net income attributable to Boston Properties, Inc. common shareholders$108,297 $89,854 
Add:
Preferred dividends— 2,625 
Noncontrolling interest—common units of the Operating Partnership11,982 10,020 
Noncontrolling interests in property partnerships18,971 15,561 
Net income139,250 118,060 
Add:
Depreciation and amortization179,412 166,456 
Noncontrolling interests in property partnerships’ share of depreciation and amortization(16,773)(15,833)
BXP’s share of depreciation and amortization from unconsolidated joint ventures17,803 20,413 
Corporate-related depreciation and amortization(443)(444)
Less:
Gains (losses) on sales of real estate348 (209)
Noncontrolling interests in property partnerships18,971 15,561 
Preferred dividends— 2,625 
Funds from Operations (FFO) attributable to the Operating Partnership common unitholders (including Boston Properties, Inc.)299,930 270,675 
Less:
Noncontrolling interest—common units of the Operating Partnership’s share of funds from operations29,453 26,697 
Funds from Operations attributable to Boston Properties, Inc. common shareholders$270,477 $243,978 
Our percentage share of Funds from Operations—basic90.18 %90.14 %
Weighted average shares outstanding—basic156,183 155,645 
94
 Three months ended September 30,
2017 2016
 (in thousands)
Net income attributable to Boston Properties, Inc. common shareholders$117,337
 $76,753
Add:   
Preferred dividends2,625
 2,589
Noncontrolling interest—common units of Boston Properties Limited Partnership13,402
 9,387
Noncontrolling interests in property partnerships14,340
 (17,225)
Less:   
Gains on sales of real estate2,891
 12,983
Income before gains on sales of real estate144,813
 58,521
Add:   
Depreciation and amortization152,164
 203,748
Noncontrolling interests in property partnerships’ share of depreciation and amortization(18,552) (40,907)
BXP’s share of depreciation and amortization from unconsolidated joint ventures9,282
 9,128
Corporate-related depreciation and amortization(434) (393)
Less:   
Noncontrolling interests in property partnerships14,340
 (17,225)
Preferred dividends2,625
 2,589
Funds from Operations (FFO) attributable to Boston Properties Limited Partnership common unitholders (including Boston Properties, Inc.) (“Basic FFO”)
270,308
 244,733
Less:   
Noncontrolling interest—common units of Boston Properties Limited Partnership’s share of funds from operations27,293
 25,169
FFO attributable to Boston Properties, Inc. common shareholders$243,015
 $219,564
Boston Properties, Inc.’s percentage share of Funds from Operations—basic89.90% 89.72%
Weighted-average shares outstanding—basic154,355
 153,754
Table of Contents
Reconciliation to Diluted Funds from Operations:
 Three months ended September 30, 2017 Three months ended September 30, 2016
Income
(Numerator)
 
Shares
(Denominator)
 
Income
(Numerator)
 
Shares
(Denominator)
 (in thousands)
Basic FFO$270,308
 171,691
 $244,733
 171,379
Effect of Dilutive Securities       
Stock Based Compensation—
 128
 —
 382
Diluted FFO270,308
 171,819
 244,733
 171,761
Less:       
Noncontrolling interest—common units of Boston Properties Limited Partnership’s share of diluted FFO27,272
 17,336
 25,113
 17,625
Boston Properties, Inc.’s share of Diluted FFO (1)$243,036
 154,483
 $219,620
 154,136
 Three months ended September 30,
 20212020
Income
(Numerator)		Shares/Units
(Denominator)		Income
(Numerator)		Shares/Units
(Denominator)
(in thousands)
Basic Funds from Operations$299,930 173,194 $270,675 172,677 
Effect of Dilutive Securities:
Stock based compensation— 415 — 25 
Diluted Funds from Operations$299,930 173,609 $270,675 172,702 
Less:
Noncontrolling interest—common units of the Operating Partnership’s share of diluted Funds from Operations29,393 17,011 26,693 17,032 
Diluted Funds from Operations attributable to Boston Properties, Inc. (1)$270,537 156,598 $243,982 155,670 
 _______________
(1)BXP’s share of diluted FFO was 89.91% and 89.74% for the three months ended September 30, 2017 and 2016, respectively.

85(1)BXP’s share of diluted Funds from Operations was 90.20% and 90.14% for the three months ended September 30, 2021 and 2020, respectively.


Boston Properties Limited Partnership
The following table presents a reconciliation of net income attributable to Boston Properties Limited Partnership common unitholders to FFO attributable to Boston Properties Limited Partnership common unitholders for the three months ended September 30, 20172021 and 2016:2020:
 Three months ended September 30,
 20212020
 (in thousands)
Net income attributable to Boston Properties Limited Partnership common unitholders$122,014 $101,624 
Add:
Preferred distributions— 2,625 
Noncontrolling interests in property partnerships18,971 15,561 
Net income140,985 119,810 
Add:
Depreciation and amortization177,677 164,706 
Noncontrolling interests in property partnerships’ share of depreciation and amortization(16,773)(15,833)
BXP’s share of depreciation and amortization from unconsolidated joint ventures17,803 20,413 
Corporate-related depreciation and amortization(443)(444)
Less:
Gains (losses) on sales of real estate348 (209)
Noncontrolling interests in property partnerships18,971 15,561 
Preferred distributions— 2,625 
Funds from Operations attributable to Boston Properties Limited Partnership common unitholders (1)$299,930 $270,675 
Weighted average shares outstanding—basic173,194 172,677 
 _______________
(1)Our calculation includes OP Units and vested LTIP Units (including vested 2012 OPP Units and vested 2013 - 2018 MYLTIP Units).
95
 Three months ended September 30,
2017 2016
 (in thousands)
Net income attributable to Boston Properties Limited Partnership common unitholders$132,693
 $91,306
Add:   
Preferred distributions2,625
 2,589
Noncontrolling interests in property partnerships14,340
 (17,225)
Less:   
Gains on sales of real estate2,891
 12,983
Income before gains on sales of real estate146,767
 63,687
Add:   
Depreciation and amortization150,210
 198,582
Noncontrolling interests in property partnerships’ share of depreciation and amortization(18,552) (40,907)
BPLP’s share of depreciation and amortization from unconsolidated joint ventures
9,282
 9,128
Corporate-related depreciation and amortization(434) (393)
Less:   
Noncontrolling interests in property partnerships14,340
 (17,225)
Preferred distributions2,625
 2,589
Funds from Operations (FFO) attributable to Boston Properties Limited Partnership common unitholders (“Basic FFO”) (1)
$270,308
 $244,733
Weighted-average units outstanding—basic171,691
 171,379
Table of Contents
_______________ 
(1)Our calculation includes OP Units and vested LTIP Units (including vested 2012 OPP Units, vested 2013 MYLTIP Units and vested 2014 MYLTIP Units).
Reconciliation to Diluted Funds from Operations:
 Three months ended September 30, 2017 Three months ended September 30, 2016
Income
(Numerator)
 
Units
(Denominator)
 
Income
(Numerator)
 
Units
(Denominator)
 (in thousands)
Basic FFO$270,308
 171,691
 $244,733
 171,379
Effect of Dilutive Securities       
Stock Based Compensation—
 128
 —
 382
Diluted FFO$270,308
 171,819
 $244,733
 171,761

 Three months ended September 30,
 20212020
(in thousands)
 Income
(Numerator)		Shares/Units
(Denominator)		Income
(Numerator)		Shares/Units
(Denominator)
Basic Funds from Operations$299,930 173,194 $270,675 172,677 
Effect of Dilutive Securities:
Stock based compensation— 415 — 25 
Diluted Funds from Operations$299,930 173,609 $270,675 172,702 
Contractual Obligations
We have various service contracts with vendors related to our property management. In addition, we have certain other contracts we enter into in the ordinary course of business that may extend beyond one year. These contracts include terms that provide for cancellation with insignificant or no cancellation penalties. Contract terms are generally between three and five years.
During the third quarter of 2017,three months ended September 30, 2021, we paid approximately $75.7$67.8 million to fund tenant-related obligations, including tenant improvements and leasing commissions,commissions.
In addition, during the three months ended September 30, 2021, we and our unconsolidated joint venture partners incurred approximately $120$102.9 million of new tenant-related obligations associated with approximately 1.31.4 million square feet of second generation leases, or approximately $98$73 per square foot. In addition, we signed leases for approximately 1.3 million square feet ofWe did not sign any first generation space.leases during the three months ended September 30, 2021. The tenant-related obligations for the

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development properties are included within the projects’ “Estimated Total Investment” referred to in “Item 2—Management’s Discussion and Analysis of Financial Condition” Condition and “Results Results of Operations—Liquidity and Capital Resources.” In the aggregate, during the third quarter

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Table of 2017, we signed leases for approximately 2.6 million square feet of space and incurred aggregate tenant-related obligations of approximately $180 million, or approximately $70 per square foot.Contents
ITEM 3—Quantitative and Qualitative Disclosures about Market Risk.
The following table presents the aggregate carrying value of our mortgage notes payable, net, unsecured senior notes, net, unsecured line of credit and our corresponding estimate of fair value as of September 30, 2017. Approximately $10.2 billion2021. As of September 30, 2021, all of these borrowings bore interest at fixed rates and therefore the fair value of these instruments is affected by changes in the market interest rates. The following table presents our aggregate fixed rate debt obligations with corresponding weighted-average interest rates sorted by maturity date. At September 30, 2017, none of our borrowings bore interest at a variable rate.
The table below does not include our unconsolidated joint venture debt. For a discussion concerning our unconsolidated joint venture debt, see Note 45 to the Consolidated Financial Statements and “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations—Capitalization—Off-Balance Sheet Arrangements—Joint Venture Indebtedness.”
202120222023202420252026+TotalEstimated Fair Value
(dollars in thousands)
Mortgage debt, net
Fixed Rate$3,058 $611,132 $(3,494)$(3,494)$(3,494)$2,294,991 $2,898,699 $3,032,122 
GAAP Average Interest Rate4.79 %4.79 %— %— %— %3.64 %3.89 %
Variable Rate— — — — — — — — 
 Unsecured debt, net
Fixed Rate$(2,920)$(11,746)$1,489,323 $690,587 $841,857 $7,472,550 $10,479,651 $11,157,602 
GAAP Average Interest Rate— %— %3.73 %3.92 %3.35 %3.41 %3.48 %
Variable Rate— — — — — — — — 
Total Debt$138 $599,386 $1,485,829 $687,093 $838,363 $9,767,541 $13,378,350 $14,189,724 

 2017 2018 2019 2020 2021 2022+ Total 
Estimated
Fair Value
 
(dollars in thousands)
Mortgage debt, net
Fixed Rate$2,782
 $14,708
 $15,745
 $16,841
 $36,346
 $2,895,645
 $2,982,067
 $3,049,617
Average Interest Rate5.04% 5.52% 5.53% 5.55% 6.61% 3.89% 3.96%  
Variable Rate—
 —
 —
 —
 —
 —
 —
 —
 Unsecured debt, net
Fixed Rate$(2,216) $841,285
 $692,461
 $692,962
 $844,289
 $4,183,786
 $7,252,567
 $7,533,164
Average Interest Rate—
 3.85% 5.97% 5.71% 4.29% 3.71% 4.21%  
Variable Rate—
 —
 —
 —
 —
 —
 —
 —
 $566
 $855,993

$708,206

$709,803

$880,635

$7,079,431

$10,234,634
 $10,582,781

At September 30, 2017,2021, the weighted-average coupon/stated rates on the fixed rate debt stated above was 4.02%3.47% per annum.
The fair value amounts were determined solely by considering the impact of hypothetical interest rates on our financial instruments. Due to the uncertainty of specific actions, we may undertake to minimize possible effects of market interest rate increases, this analysis assumes no changes in our financial structure.
On March 5, 2021, the Financial Conduct Authority (“FCA”) announced that USD LIBOR will no longer be published after June 30, 2023. This announcement has several implications, including setting the spread that may be used to automatically convert contracts from LIBOR to the Secured Overnight Financing Rate (“SOFR”). Additionally, banking regulators are encouraging banks to discontinue new LIBOR debt issuances by December 31, 2021.
We anticipate that LIBOR will continue to be available at least until June 30, 2023. Any changes adopted by the FCA or other governing bodies in the method used for determining LIBOR may result in a sudden or prolonged increase or decrease in reported LIBOR. If that were to occur, our interest payments could change. In addition, uncertainty about the extent and manner of future changes may result in interest rates and/or payments that are higher or lower than if LIBOR were to remain available in its current form.
We and our unconsolidated joint ventures have contracts that are indexed to LIBOR and we are monitoring and evaluating the related risks. These risks arise in connection with transitioning contracts to an alternative rate, including any resulting value transfer that may occur, and are likely to vary by contract. The value of loans, securities, or derivative instruments tied to LIBOR, as well as interest rates on our unconsolidated joint ventures current or future indebtedness, may also be impacted if LIBOR is limited or discontinued. For some instruments the method of transitioning to an alternative reference rate may be challenging, especially if we cannot agree with the respective counterparty about how to make the transition.
While we expect LIBOR to be available in substantially its current form until at least the end of June 30, 2023, it is possible that LIBOR will become unavailable prior to that point. This could result, for example, if sufficient banks decline to make submissions to the LIBOR administrator. In that case, the risks associated with the transition to an alternative reference rate will be accelerated and magnified.
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Alternative rates and other market changes related to the replacement of LIBOR, including the introduction of financial products and changes in market practices, may lead to risk modeling and valuation challenges, such as adjusting interest rate accrual calculations and building a term structure for an alternative rate.
The introduction of an alternative rate also may create additional basis risk and increased volatility as alternative rates are phased in and utilized in parallel with LIBOR.
Adjustments to systems and mathematical models to properly process and account for alternative rates will be required, which may strain the model risk management and information technology functions and result in substantial incremental costs for us.
ITEM 4—Controls and Procedures.
Boston Properties, Inc.
(a) Evaluation of Disclosure Controls and Procedures. As of the end of the period covered by this report, our management, with the participation of Boston Properties, Inc.’s Chief Executive Officer (Principal Executive Officer) and Chief Financial Officer (Principal Financial Officer), evaluated the effectiveness of our disclosure controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934)1934, as amended). Based upon that evaluation, Boston Properties, Inc.’s Chief Executive Officer and Chief Financial Officer concluded that these disclosure controls and procedures were effective as of the end of the period covered by this report.
(b) Changes in Internal Control Over Financial Reporting. No change in Boston Properties, Inc.’s internal control over financial reporting (as defined in Rule 13a-15(f) under the Securities Exchange Act of 1934)1934, as amended) occurred during the third quarter of our fiscal year ending December 31, 20172021 that has materially affected, or is reasonably likely to materially affect, Boston Properties, Inc.’s internal control over financial reporting.

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Boston Properties Limited Partnership
(a) Evaluation of Disclosure Controls and Procedures. As of the end of the period covered by this report, the management of Boston Properties, Inc., the sole general partner of Boston Properties Limited Partnership, with the participation of its Chief Executive Officer (Principal Executive Officer) and Chief Financial Officer (Principal Financial Officer), evaluated the effectiveness of our disclosure controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934)1934, as amended). Based upon that evaluation, the Chief Executive Officer and Chief Financial Officer of Boston Properties, Inc. concluded that these disclosure controls and procedures were effective as of the end of the period covered by this report.
(b) Changes in Internal Control Over Financial Reporting. No change in its internal control over financial reporting (as defined in Rule 13a-15(f) under the Securities Exchange Act of 1934)1934, as amended) occurred during the third quarter of our fiscal year ending December 31, 20172021 that has materially affected, or is reasonably likely to materially affect, its internal control over financial reporting.



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PART II. OTHER INFORMATION
ITEM 1—Legal Proceedings.
We are subject to legal proceedings and claims that arise in the ordinary course of business. These matters are generally covered by insurance. Management believes that the final outcome of such matters will not have a material adverse effect on our financial position, results of operations or liquidity.
ITEM 1A—Risk Factors.
Except to the extent updated below or previously updated or to the extent additional factual information disclosed elsewhere in thesethis Quarterly ReportsReport on Form 10-Q relates to such risk factors (including, without limitation, the matters discussed in Part I, “Item 2—“Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations”Operations”), there were no material changes to the risk factors disclosed in Part I, “Item 1A. Risk Factors” of our Annual Report on Form 10-K for the year ended December 31, 2016.2020.
Our use of joint ventures and participation in a co-investment program may limit our flexibility with jointly owned investments and other assets we may wish to acquire.
In appropriate circumstances, we intend to acquire and recapitalize or develop, as applicable, properties in joint ventures with other persons or entities. We currently have joint ventures that are and are not consolidated within our financial statements. Our participation in joint ventures subjects us to risks, including but not limited to, the following risks that:
•our joint venture partners may have different objectives than we have regarding the appropriate timing and terms of any sale or refinancing of a property, its operation or, if applicable, the commencement of development activities, and we could become engaged in a dispute with any of our joint venture partners that could lead to the sale of either parties’ ownership interest or the property;
•some of our joint ventures are subject to debt and, depending on credit market conditions, the refinancing of such debt may require equity capital calls;
•our joint venture partners may be structured differently than us for tax purposes and this could create conflicts of interest, including with respect to our compliance with the REIT requirements, and our REIT status could be jeopardized if any of our joint ventures do not operate in compliance with REIT requirements;
•our joint venture partners may have competing interests in our markets that could create conflicts of interest;
•our joint venture partners may default on their obligations, which could necessitate that we fulfill their obligation ourselves;
•our joint ventures may be unable to repay any amounts that we may loan to them;
•our joint venture agreements may contain provisions limiting the liquidity of our interest for sale or sale of the entire asset;
•our subsidiaries that would be the general partner or managing member of the joint ventures could be generally liable, under applicable law or the governing agreement of a program venture, for the debts and obligations of the venture, subject to certain exculpation and indemnification rights pursuant to the terms of the governing agreement;
•our joint venture agreements may contain provisions that would allow partners to remove us as the general partner or managing member in certain cases involving cause;
•while we would have discretion to manage joint ventures for which we are the general partner or managing member, our partner(s)’ approval would be required to approve certain matters, and as a result, we may be unable to cause a joint venture to implement certain decisions that we consider beneficial; and
•with respect to our participation in the co-investment program, we could lose opportunities to pursue properties that are within the program’s target investment definition alone or with other partners with whom the terms of the joint venture and/or our returns could be more favorable to us.
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ITEM 2—Unregistered Sales of Equity Securities and Use of Proceeds
Boston Properties, Inc.

(a)None.
(a)None.
(b)Not applicable.
(c)Issuer Purchases of Equity Securities. None.

(b)Not Applicable.
(c)Issuer Purchases of Equity Securities.
Period(a)
Total Number of Shares of Common Stock Purchased		(b)
Average Price Paid per Common Share		(c)
Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs		(d)
Maximum Number (or Approximate Dollar Value) of Shares that May Yet be Purchased
July 1, 2021 – July 31, 2021105 (1)$0.01 N/AN/A
August 1, 2021 – August 31, 20212,023 (1)$0.01 N/AN/A
September 1, 2021 – September 30, 2021— $— N/AN/A
Total2,128 $0.01 N/AN/A
___________
(1)Represents shares of restricted common stock of BXP repurchased in connection with the termination of certain employees’ employment with BXP. Under the terms of the applicable restricted stock award agreements, the shares were repurchased by BXP at a price of $0.01 per share, which was the amount originally paid by such employees for such shares.
Boston Properties Limited Partnership

(a)Each time Boston Properties, Inc. issues shares of stock (other than in exchange for common units when such common units are presented for redemption), it contributes the proceeds of such issuance to us in return for an equivalent number of partnership units with rights and preferences analogous to the shares issued. During the three months ended September 30, 2017, in connection with issuances of common stock by Boston Properties, Inc. pursuant to issuances to employees pursuant to the Boston Properties, Inc. 1999 Non-Qualified Employee Stock Purchase Plan, Boston Properties Limited Partnership issued an aggregate of approximately 3,381 common units to Boston Properties, Inc. in exchange for approximately $360,000, the aggregate proceeds of such common stock issuances, to Boston Properties, Inc. Such units were issued in reliance on an exemption from registration under Section 4(a)(2) of the Securities Act of 1933, as amended.
(b)Not Applicable.
(c)Issuer Purchases of Equity Securities. None.

(a)Each time BXP issues shares of stock (other than in exchange for common units when such common units are presented for redemption), it contributes the proceeds of such issuance to BPLP in return for an equivalent number of partnership units with rights and preferences analogous to the shares issued. During the three months ended September 30, 2021, in connection with issuances of common stock by BXP pursuant to issuances to employees of restricted common stock under the 2021 Plan and issuances of common stock under the Boston Properties, Inc. 1999 Non-Qualified Employee Stock Purchase Plan, BPLP issued an aggregate of 22,862 common units to BXP in exchange for approximately $452,250, the aggregate proceeds of such common stock issuances to BXP. Such units were issued in reliance on an exemption from registration under Section 4(a)(2) of the Securities Act of 1933, as amended.
(b)Not Applicable.
(c)Issuer Purchases of Equity Securities.
Period(a)
Total Number of Units Purchased		 (b)
Average Price Paid per Unit		(c)
Total Number of Units Purchased as Part of Publicly Announced Plans or Programs		(d)
Maximum Number (or Approximate Dollar Value) of Units that May Yet be Purchased
July 1, 2021 – July 31, 2021850 (1)$0.22 N/AN/A
August 1, 2021 – August 31, 20212,195 (2)$0.03 N/AN/A
September 1, 2021 – September 30, 2021— $— N/AN/A
Total3,045  $0.08 N/AN/A
___________
(1)Includes 105 common units previously held by BXP that were redeemed in connection with the repurchase of shares of restricted common stock of BXP in connection with the termination of a certain employee’s employment with BXP and 745 LTIP units that were repurchased by BPLP in connection with the termination of a certain employee’s employment with BXP. Under the terms of the applicable restricted stock award agreement and LTIP unit vesting agreements, such shares were repurchased at a price of $0.01 per share and such LTIP units were repurchased at a price of $0.25 per LTIP unit, which were the amounts originally paid by such employee for such shares and LTIP units.
(2)Includes 2,023 common units previously held by BXP that were redeemed in connection with the repurchase of shares of restricted common stock of BXP in connection with the termination of a certain employee’s employment with BXP and
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172 LTIP units that were repurchased by BPLP in connection with the termination of a certain employee’s employment with BXP. Under the terms of the applicable restricted stock award agreements and LTIP unit vesting agreement, such shares were repurchased at a price of $0.01 per share and such LTIP units were repurchased at a price of $0.25 per LTIP unit, which were the amounts originally paid by such employee for such shares and LTIP units.
ITEM 3—Defaults Upon Senior Securities.
None.
ITEM 4—Mine Safety Disclosures.
None.
ITEM 5—Other Information.
(a)None.
(b)None.

(a)None.
(b)None.
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ITEM 6—Exhibits.
(a)Exhibits
(a)Exhibits
4.1 
12.1
—
12.2
—
Calculation of Ratios of Earnings to Fixed Charges and Calculation of Ratios of Earnings to Combined Fixed Charges and Preferred Distributions for Boston Properties Limited Partnership. (Filed herewith.Partnership filed on September29,2021.)
31.1
—
31.2
—
31.3
—
31.4
—
32.1
—
32.2
—
32.3
—
32.4
—
101101.SCH
—		—Inline XBRL Taxonomy Extension Schema Document. (Filed herewith.)
The following materials from Boston Properties, Inc.’s and Boston Properties Limited Partnership’s Quarterly Reports on Form 10-Q for the quarter ended September 30, 2017 formatted
101.CAL—Inline XBRL Taxonomy Extension Calculation Linkbase Document. (Filed herewith.)
101.LAB—Inline XBRL Taxonomy Extension Label Linkbase Document. (Filed herewith.)
101.PRE—Inline XBRL Taxonomy Extension Presentation Linkbase Document. (Filed herewith.)
101.DEF—Inline XBRL Taxonomy Extension Definition Linkbase Document. (Filed herewith.)
104 —Cover Page Interactive Data File (formatted as Inline XBRL with applicable taxonomy extension information contained in XBRL (eXtensible Business Reporting Language): (i) the Consolidated Balance Sheets, (ii) the Consolidated Statements of Operations, (iii) the Consolidated Statements of Comprehensive Income, (iv) the Consolidated Statements of Stockholders’ Equity, (v) the Consolidated Statements of Partners’ Capital (vi) the Consolidated Statements of Cash Flows, and (vii) related notes to these financial statements.Exhibits 101*.). (Filed herewith.)

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SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.





BOSTON PROPERTIES, INC.
November 5, 2021BOSTON PROPERTIES, INC.
November 6, 2017
/s/    MICHAEL R. WALSH        
Michael R. Walsh
Chief Accounting Officer

(duly authorized officer and principal accounting officer)



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SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.





BOSTON PROPERTIES LIMITED PARTNERSHIP
By: Boston Properties, Inc., its General Partner
November 6, 20175, 2021
/s/    MICHAEL R. WALSH        
Michael R. Walsh
Chief Accounting Officer

(duly authorized officer and principal accounting officer)


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