10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Quarterly Period Ended September 30, 2022

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.	Delaware	04-2473675
	(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)
Boston Properties Limited Partnership	Delaware	04-3372948
	(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:

Registrant	Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Boston Properties, Inc.	Common Stock, par value $0.01 per share	BXP	New 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  ☐    

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted 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 such files).    

Boston Properties, Inc.:    Yes  x    No  ☐         Boston Properties Limited Partnership:    Yes  x    No  ☐    

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 the 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 share	156,754,712
(Registrant)	(Class)	(Outstanding on November 1, 2022)

EXPLANATORY NOTE

This report combines the Quarterly Reports on Form 10-Q for the period ended September 30, 2022 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. 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, 2022, BXP owned an approximate 89.6% ownership interest in BPLP. The remaining approximate 10.4% interest was owned by limited partners. The other limited partners of BPLP either (1) contributed their direct or indirect interests in properties to BPLP in exchange for common units or preferred units of limited partnership interest in BPLP or (2) received long-term incentive plan units of BPLP pursuant to BXP’s Stock Option and Incentive Plans, or both. 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 Reports on Form 10-Q of BXP and BPLP into this single report:

•enhances investors’ understanding of BXP and BPLP by enabling them 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 issuances 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, 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 in BPLP and limited partners of BPLP. The differences between shareholders’ equity and partners’ capital result from differences in the equity issued by each of BXP and BPLP.

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 the time of such redemptions, resulting in a difference between the net real estate of BXP as compared to BPLP of approximately $252.2 million, or 1.3% at September 30, 2022, and a corresponding difference in depreciation expense, impairment losses and gains on sales of real estate upon the sale of these 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 subsequent redemptions to be accounted for solely as an equity transaction.

To help investors better understand the key differences between BXP and BPLP, the following items in this report present information separately for BXP and BPLP:

• Item 1. Financial Statements (unaudited), which includes the following specific disclosures for BXP and BPLP:

• Note 3. Real Estate;

• Note 9. Stockholders’ Equity / Partners’ Capital;

• Note 10. Segment Information; and

• Note 11. Earnings Per Share / Common Unit

• 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 31 and 32 certifications for each of BXP and BPLP.

BOSTON PROPERTIES, INC. AND BOSTON PROPERTIES LIMITED PARTNERSHIP

FORM 10-Q

for the quarter ended September 30, 2022

TABLE OF CONTENTS

		Page
PART I. FINANCIAL INFORMATION
ITEM 1.	Financial Statements (unaudited)	1
Boston Properties, Inc.
	a) Consolidated Balance Sheets as of September 30, 2022 and December 31, 2021	1
	b) Consolidated Statements of Operations for the three and nine months ended September 30, 2022 and 2021	3
	c) Consolidated Statements of Comprehensive Income for the three and nine months ended September 30, 2022 and 2021	4
	d) Consolidated Statements of Equity for the three and nine months ended September 30, 2022 and 2021	5
	e) Consolidated Statements of Cash Flows for the nine months ended September 30, 2022 and 2021	7
Boston Properties Limited Partnership
	a) Consolidated Balance Sheets as of September 30, 2022 and December 31, 2021	9
	b) Consolidated Statements of Operations for the three and nine months ended September 30, 2022 and 2021	11
	c) Consolidated Statements of Comprehensive Income for the three and nine months ended September 30, 2022 and 2021	12
	d) Consolidated Statements of Capital and Noncontrolling Interests for the three and nine months ended September 30, 2022 and 2021	13
	e) Consolidated Statements of Cash Flows for the nine months ended September 30, 2022 and 2021	15
Boston Properties, Inc. and Boston Properties Limited Partnership
	Notes to the Consolidated Financial Statements	17
ITEM 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	45
ITEM 3.	Quantitative and Qualitative Disclosures about Market Risk	95
ITEM 4.	Controls and Procedures	96
PART II. OTHER INFORMATION
ITEM 1.	Legal Proceedings	97
ITEM 1A.	Risk Factors	97
ITEM 2.	Unregistered Sales of Equity Securities and Use of Proceeds	98
ITEM 3.	Defaults Upon Senior Securities	99
ITEM 4.	Mine Safety Disclosures	99
ITEM 5.	Other Information	99
ITEM 6.	Exhibits	100
SIGNATURES		101

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, 2022		December 31, 2021
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,753,779 and $6,702,830 at September 30, 2022 and December 31, 2021, respectively)	$	25,192,376	$	23,752,630
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at September 30, 2022 and December 31, 2021, respectively)	237,505		237,507
Right of use assets - operating leases	167,935		169,778
Less: accumulated depreciation (amounts related to VIEs of $(1,352,781) and $(1,283,060) at September 30, 2022 and December 31, 2021, respectively)	(6,170,472)		(5,883,961)
Total real estate	19,427,344		18,275,954
Cash and cash equivalents (amounts related to VIEs of $249,124 and $300,937 at September 30, 2022 and December 31, 2021, respectively)	375,774		452,692
Cash held in escrows	73,112		48,466
Investments in securities	30,040		43,632
Tenant and other receivables, net (amounts related to VIEs of $11,842 and $6,824 at September 30, 2022 and December 31, 2021, respectively)	69,633		70,186
Related party note receivable, net	78,592		78,336
Notes receivable, net	—		9,641
Accrued rental income, net (amounts related to VIEs of $359,439 and $357,395 at September 30, 2022 and December 31, 2021, respectively)	1,250,176		1,226,745
Deferred charges, net (amounts related to VIEs of $176,908 and $174,637 at September 30, 2022 and December 31, 2021, respectively)	720,648		618,798
Prepaid expenses and other assets (amounts related to VIEs of $44,525 and $29,668 at September 30, 2022 and December 31, 2021, respectively)	107,538		57,811
Investments in unconsolidated joint ventures	1,593,834		1,482,997
Total assets	$	23,726,691	$	22,365,258
LIABILITIES AND EQUITY
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $3,271,157 and $3,267,914 at September 30, 2022 and December 31, 2021, respectively)	$	3,271,157	$	3,267,914
Unsecured senior notes, net	9,491,714		9,483,695
Unsecured line of credit	340,000		145,000
Unsecured term loan, net	730,000		—
Lease liabilities - finance leases (amounts related to VIEs of $20,568 and $20,458 at September 30, 2022 and December 31, 2021, respectively)	248,092		244,421
Lease liabilities - operating leases	205,008		204,561
Accounts payable and accrued expenses (amounts related to VIEs of $35,043 and $29,464 at September 30, 2022 and December 31, 2021, respectively)	360,572		320,775
Dividends and distributions payable	170,952		169,859
Accrued interest payable	91,885		94,796
Other liabilities (amounts related to VIEs of $104,663 and $150,131 at September 30, 2022 and December 31, 2021, respectively)	417,255		391,441
Total liabilities	15,326,635		14,322,462

1

BOSTON PROPERTIES, INC. CONSOLIDATED BALANCE SHEETS (unaudited and in thousands, except for share and par value amounts)
	September 30, 2022		December 31, 2021
Commitments and contingencies (See Note 7)
Redeemable deferred stock units— 93,175 and 83,073 units outstanding at redemption value at September 30, 2022 and December 31, 2021, respectively	6,985		9,568
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, none issued or outstanding	—		—
Common stock, $0.01 par value, 250,000,000 shares authorized, 156,833,612 and 156,623,749 issued and 156,754,712 and 156,544,849 outstanding at September 30, 2022 and December 31, 2021, respectively	1,568		1,565
Additional paid-in capital	6,532,299		6,497,730
Dividends in excess of earnings	(359,536)		(625,891)
Treasury common stock at cost, 78,900 shares at September 30, 2022 and December 31, 2021	(2,722)		(2,722)
Accumulated other comprehensive loss	(15,991)		(36,662)
Total stockholders’ equity attributable to Boston Properties, Inc.	6,155,618		5,834,020
Noncontrolling interests:
Common units of Boston Properties Limited Partnership	685,952		642,655
Property partnerships	1,551,501		1,556,553
Total equity	8,393,071		8,033,228
Total liabilities and equity	$	23,726,691	$	22,365,258

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

2

BOSTON PROPERTIES, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

(unaudited and in thousands, except for per share amounts)

	Three months ended September 30,				Nine months ended September 30,
	2022		2021		2022		2021
Revenue
Lease	$	739,255	$	692,260	$	2,179,274	$	2,062,102
Parking and other	28,154		23,507		80,234		58,727
Hotel	11,749		5,189		28,395		7,382
Development and management services	7,465		6,094		19,650		20,181
Direct reimbursements of payroll and related costs from management services contracts	3,900		3,006		11,204		9,166
Total revenue	790,523		730,056		2,318,757		2,157,558
Expenses
Operating
Rental	281,702		258,281		825,805		764,373
Hotel	8,548		3,946		19,832		7,993
General and administrative	32,519		34,560		110,378		117,924
Payroll and related costs from management services contracts	3,900		3,006		11,204		9,166
Transaction costs	1,650		1,888		2,146		2,970
Depreciation and amortization	190,675		179,412		551,445		539,815
Total expenses	518,994		481,093		1,520,810		1,442,241
Other income (expense)
Loss from unconsolidated joint ventures	(3,524)		(5,597)		(1,389)		(1,745)
Gains on sales of real estate	262,345		348		381,293		8,104
Interest and other income (loss)	3,728		1,520		6,151		4,140
Other income - assignment fee	—		—		6,624		—
Gains (losses) from investments in securities	(1,571)		(190)		(8,549)		3,744
Losses from early extinguishment of debt	—		—		—		(898)
Interest expense	(111,846)		(105,794)		(317,216)		(320,015)
Net income	420,661		139,250		864,861		408,647
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnerships	(18,801)		(18,971)		(54,896)		(52,602)
Noncontrolling interest—common units of the Operating Partnership	(40,883)		(11,982)		(82,821)		(35,393)
Net income attributable to Boston Properties, Inc.	360,977		108,297		727,144		320,652
Preferred dividends	—		—		—		(2,560)
Preferred stock redemption charge	—		—		—		(6,412)
Net income attributable to Boston Properties, Inc. common shareholders	$	360,977	$	108,297	$	727,144	$	311,680
Basic earnings per common share attributable to Boston Properties, Inc. common shareholders:
Net income	$	2.30	$	0.69	$	4.63	$	2.00
Weighted average number of common shares outstanding	156,754		156,183		156,708		156,062
Diluted earnings per common share attributable to Boston Properties, Inc. common shareholders:
Net income	$	2.29	$	0.69	$	4.62	$	1.99
Weighted average number of common and common equivalent shares outstanding	157,133		156,598		157,144		156,394

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

3

BOSTON PROPERTIES, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(unaudited and in thousands)

	Three months ended September 30,				Nine months ended September 30,
	2022		2021		2022		2021
Net income	$	420,661	$	139,250	$	864,861	$	408,647
Other comprehensive income:
Effective portion of interest rate contracts	10,800		1,088		18,400		5,482
Amortization of interest rate contracts (1)	1,677		1,676		5,030		5,028
Other comprehensive income	12,477		2,764		23,430		10,510
Comprehensive income	433,138		142,014		888,291		419,157
Net income attributable to noncontrolling interests	(59,684)		(30,953)		(137,717)		(87,995)
Other comprehensive income attributable to noncontrolling interests	(1,390)		(401)		(2,757)		(1,423)
Comprehensive income attributable to Boston Properties, Inc.	$	372,064	$	110,660	$	747,817	$	329,739

_______________

(1)Amounts reclassified from comprehensive income primarily to interest expense within Boston Properties, Inc.’s Consolidated Statements of Operations.

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

4

BOSTON PROPERTIES, INC. CONSOLIDATED STATEMENTS OF EQUITY  (unaudited and in thousands)
	Common Stock			Additional Paid-in Capital		Dividends in Excess of Earnings		Treasury Stock, at cost		Accumulated Other Comprehensive Loss		Noncontrolling Interests - Common Units		Noncontrolling Interests - Property Partnerships		Total
	Shares	Amount
Equity, June 30, 2022	156,726	$	1,567	$	6,524,997	$	(567,016)	$	(2,722)	$	(27,077)	$	660,214	$	1,552,706	$	8,142,669
Redemption of operating partnership units to common stock	26	1		958		—		—		—		(959)		—		—
Allocated net income for the period	—	—		—		361,100		—		—		40,760		18,801		420,661
Dividends/distributions declared	—	—		—		(153,620)		—		—		(17,930)		—		(171,550)
Shares issued pursuant to stock purchase plan	5	—		436		—		—		—		—		—		436
Net activity from stock option and incentive plan	(2)	—		1,648		—		—		—		6,880		—		8,528
Contributions from noncontrolling interests in property partnerships	—	—		—		—		—		—		—		—		—
Distributions to noncontrolling interests in property partnerships	—	—		—		—		—		—		—		(20,150)		(20,150)
Effective portion of interest rate contracts	—	—		—		—		—		9,709		1,091		—		10,800
Amortization of interest rate contracts	—	—		—		—		—		1,377		156		144		1,677
Reallocation of noncontrolling interest	—	—		4,260		—		—		—		(4,260)		—		—
Equity, September 30, 2022	156,755	$	1,568	$	6,532,299	$	(359,536)	$	(2,722)	$	(15,991)	$	685,952	$	1,551,501	$	8,393,071
Equity, June 30, 2021	156,136	$	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 stock	50	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 plan	4	—		520		—		—		—		—		—		520
Net activity from stock option and incentive plan	16	—		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, 2021	156,206	$	1,562	$	6,415,802	$	(657,021)	$	(2,722)	$	(40,803)	$	609,830	$	1,728,101	$	8,054,749

5

BOSTON PROPERTIES, INC. CONSOLIDATED STATEMENTS OF EQUITY  (unaudited and in thousands)
	Common Stock			Preferred Stock		Additional Paid-in Capital		Dividends in Excess of Earnings		Treasury Stock, at cost		Accumulated Other Comprehensive Loss		Noncontrolling Interests - Common Units		Noncontrolling Interests - Property Partnerships		Total
	Shares	Amount
Equity, December 31, 2021	156,545	$	1,565	$	—	$	6,497,730	$	(625,891)	$	(2,722)	$	(36,662)	$	642,655	$	1,556,553	$	8,033,228
Redemption of operating partnership units to common stock	178	3		—		6,385		—		—		—		(6,388)		—		—
Allocated net income for the period	—	—		—		—		727,144		—		—		82,821		54,896		864,861
Dividends/distributions declared	—	—		—		—		(460,789)		—		—		(53,789)		—		(514,578)
Shares issued pursuant to stock purchase plan	10	—		—		1,036		—		—		—		—		—		1,036
Net activity from stock option and incentive plan	22	—		—		5,935		—		—		—		39,539		—		45,474
Contributions from noncontrolling interests in property partnerships	—	—		—		—		—		—		—		—		849		849
Distributions to noncontrolling interests in property partnerships	—	—		—		—		—		—		—		—		(61,229)		(61,229)
Effective portion of interest rate contracts	—	—		—		—		—		—		16,540		1,860		—		18,400
Amortization of interest rate contracts	—	—		—		—		—		—		4,131		467		432		5,030
Reallocation of noncontrolling interest	—	—		—		21,213		—		—		—		(21,213)		—		—
Equity, September 30, 2022	156,755	$	1,568	$	—	$	6,532,299	$	(359,536)	$	(2,722)	$	(15,991)	$	685,952	$	1,551,501	$	8,393,071
Equity, December 31, 2020	155,719	$	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 stock	227	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 plan	9	—		—		1,004		—		—		—		—		—		1,004
Net activity from stock option and incentive plan	251	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, 2021	156,206	$	1,562	$	—	$	6,415,802	$	(657,021)	$	(2,722)	$	(40,803)	$	609,830	$	1,728,101	$	8,054,749

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

6

BOSTON PROPERTIES, INC. CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited and in thousands)
	Nine months ended September 30,
	2022		2021
Cash flows from operating activities:
Net income	$	864,861	$	408,647
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	551,445		539,815
Amortization of right of use assets - operating leases	1,843		3,208
Non-cash compensation expense	44,208		43,098
Loss from unconsolidated joint ventures	1,389		1,745
Distributions of net cash flow from operations of unconsolidated joint ventures	20,511		18,462
Losses (gains) from investments in securities	8,549		(3,744)
Allowance for current expected credit losses	(476)		(758)
Non-cash portion of interest expense	19,704		17,584
Settlement of accreted debt discount on redemption of unsecured senior notes	—		(6,290)
Losses from early extinguishments of debt	—		898
Other income - assignment fee	(6,624)		—
Gains on sales of real estate	(381,293)		(8,104)
Change in assets and liabilities:
Tenant and other receivables, net	4,133		13,738
Notes receivable, net	(152)		(419)
Accrued rental income, net	(76,268)		(74,283)
Prepaid expenses and other assets	(46,104)		(61,019)
Lease liabilities - operating leases	447		(24,023)
Accounts payable and accrued expenses	3,167		26,097
Accrued interest payable	(2,900)		(18,237)
Other liabilities	(35,490)		(51,938)
Tenant leasing costs	(58,547)		(37,618)
Total adjustments	47,542		378,212
Net cash provided by operating activities	912,403		786,859
Cash flows from investing activities:
Acquisitions of real estate	(1,320,273)		(218,679)
Construction in progress	(384,083)		(381,104)
Building and other capital improvements	(112,755)		(103,840)
Tenant improvements	(139,986)		(218,878)
Proceeds from sales of real estate	695,231		—
Proceeds from assignment fee	6,624		—
Capital contributions to unconsolidated joint ventures	(109,643)		(95,462)
Capital distributions from unconsolidated joint ventures	36,622		122
Proceeds from sale of investment in unconsolidated joint venture	—		17,789
Proceeds from notes receivable	10,000		—
Investments in securities, net	5,043		1,684
Net cash used in investing activities	(1,313,220)		(998,368)
Cash flows from financing activities:
Repayments of mortgage notes payable	—		(13,261)
Proceeds from unsecured senior notes	—		1,695,996
Redemption of unsecured senior notes	—		(843,710)

7

BOSTON PROPERTIES, INC. CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited and in thousands)
	Nine months ended September 30,
	2022		2021
Borrowings on unsecured line of credit	885,000		300,000
Repayments of unsecured line of credit	(690,000)		(300,000)
Borrowings on unsecured term loan	730,000		—
Redemption of preferred stock	—		(200,000)
Payments on finance lease obligations	—		1,250
Repayment of unsecured term loan	—		(500,000)
Deferred financing costs	(2,230)		(20,770)
Debt prepayment and extinguishment costs	—		(185)
Net activity from equity transactions	(359)		20,028
Dividends and distributions	(513,486)		(513,381)
Contributions from noncontrolling interests in property partnerships	849		13,738
Distributions to noncontrolling interests in property partnerships	(61,229)		(65,604)
Net cash provided by (used in) financing activities	348,545		(425,899)
Net increase (decrease) in cash and cash equivalents and cash held in escrows	(52,272)		(637,408)
Cash and cash equivalents and cash held in escrows, beginning of period	501,158		1,719,329
Cash and cash equivalents and cash held in escrows, end of period	$	448,886	$	1,081,921
Reconciliation of cash and cash equivalents and cash held in escrows:
Cash and cash equivalents, beginning of period	$	452,692	$	1,668,742
Cash held in escrows, beginning of period	48,466		50,587
Cash and cash equivalents and cash held in escrows, beginning of period	$	501,158	$	1,719,329
Cash and cash equivalents, end of period	$	375,774	$	1,002,728
Cash held in escrows, end of period	73,112		79,193
Cash and cash equivalents and cash held in escrows, end of period	$	448,886	$	1,081,921
Supplemental disclosures:
Cash paid for interest	$	339,067	$	358,015
Interest capitalized	$	40,048	$	36,632
Non-cash investing and financing activities:
Write-off of fully depreciated real estate	$	(95,996)	$	(159,108)
Change in real estate included in accounts payable and accrued expenses	$	29,290	$	(22,104)
Construction in progress, net deconsolidated	$	(11,316)	$	—
Investment in unconsolidated joint ventures recorded upon deconsolidation	$	11,316	$	—
Right-of-use assets obtained in exchange for lease liabilities	$	—	$	26,887
Dividends and distributions declared but not paid	$	170,952	$	169,739
Conversions of noncontrolling interests to stockholders’ equity	$	6,388	$	8,033
Issuance of restricted securities to employees and non-employee directors	$	48,605	$	44,257

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

8

BOSTON PROPERTIES LIMITED PARTNERSHIP CONSOLIDATED BALANCE SHEETS (unaudited and in thousands, except for unit amounts)
	September 30, 2022		December 31, 2021
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,753,779 and $6,702,830 at September 30, 2022 and December 31, 2021, respectively)	$	24,824,862	$	23,379,243
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at September 30, 2022 and December 31, 2021, respectively)	237,505		237,507
Right of use assets - operating leases	167,935		169,778
Less: accumulated depreciation (amounts related to VIEs of $(1,352,781) and $(1,283,060) at September 30, 2022 and December 31, 2021, respectively)	(6,055,172)		(5,772,018)
Total real estate	19,175,130		18,014,510
Cash and cash equivalents (amounts related to VIEs of $249,124 and $300,937 at September 30, 2022 and December 31, 2021, respectively)	375,774		452,692
Cash held in escrows	73,112		48,466
Investments in securities	30,040		43,632
Tenant and other receivables, net (amounts related to VIEs of $11,842 and $6,824 at September 30, 2022 and December 31, 2021, respectively)	69,633		70,186
Related party note receivable, net	78,592		78,336
Notes receivable, net	—		9,641
Accrued rental income, net (amounts related to VIEs of $359,439 and $357,395 at September 30, 2022 and December 31, 2021, respectively)	1,250,176		1,226,745
Deferred charges, net (amounts related to VIEs of $176,908 and $174,637 at September 30, 2022 and December 31, 2021, respectively)	720,648		618,798
Prepaid expenses and other assets (amounts related to VIEs of $44,525 and $29,668 at September 30, 2022 and December 31, 2021, respectively)	107,538		57,811
Investments in unconsolidated joint ventures	1,593,834		1,482,997
Total assets	$	23,474,477	$	22,103,814
LIABILITIES AND CAPITAL
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $3,271,157 and $3,267,914 at September 30, 2022 and December 31, 2021, respectively)	$	3,271,157	$	3,267,914
Unsecured senior notes, net	9,491,714		9,483,695
Unsecured line of credit	340,000		145,000
Unsecured term loan, net	730,000		—
Lease liabilities - finance leases (amounts related to VIEs of $20,568 and $20,458 at September 30, 2022 and December 31, 2021, respectively)	248,092		244,421
Lease liabilities - operating leases	205,008		204,561
Accounts payable and accrued expenses (amounts related to VIEs of $35,043 and $29,464 at September 30, 2022 and December 31, 2021, respectively)	360,572		320,775
Dividends and distributions payable	170,952		169,859
Accrued interest payable	91,885		94,796
Other liabilities (amounts related to VIEs of $104,663 and $150,131 at September 30, 2022 and December 31, 2021, respectively)	417,255		391,441
Total liabilities	15,326,635		14,322,462
Commitments and contingencies (See Note 7)
Redeemable deferred stock units— 93,175 and 83,073 units outstanding at redemption value at September 30, 2022 and December 31, 2021, respectively	6,985		9,568

9

BOSTON PROPERTIES LIMITED PARTNERSHIP CONSOLIDATED BALANCE SHEETS (unaudited and in thousands, except for unit amounts)
	September 30, 2022		December 31, 2021
Noncontrolling interests:
Redeemable partnership units— 16,535,172 and 16,561,186 common units and 1,680,123 and 1,485,376 long term incentive units outstanding at redemption value at September 30, 2022 and December 31, 2021, respectively	1,407,762		2,078,603
Capital:
Boston Properties Limited Partnership partners’ capital— 1,749,700 and 1,745,914 general partner units and 155,005,012 and 154,798,935 limited partner units outstanding at September 30, 2022 and December 31, 2021, respectively	5,197,585		4,173,290
Accumulated other comprehensive loss	(15,991)		(36,662)
Total partners’ capital	5,181,594		4,136,628
Noncontrolling interests in property partnerships	1,551,501		1,556,553
Total capital	6,733,095		5,693,181
Total liabilities and capital	$	23,474,477	$	22,103,814

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

10

BOSTON PROPERTIES LIMITED PARTNERSHIP

CONSOLIDATED STATEMENTS OF OPERATIONS

(unaudited and in thousands, except for per unit amounts)

	Three months ended September 30,				Nine months ended September 30,
	2022		2021		2022		2021
Revenue
Lease	$	739,255	$	692,260	$	2,179,274	$	2,062,102
Parking and other	28,154		23,507		80,234		58,727
Hotel	11,749		5,189		28,395		7,382
Development and management services	7,465		6,094		19,650		20,181
Direct reimbursements of payroll and related costs from management services contracts	3,900		3,006		11,204		9,166
Total revenue	790,523		730,056		2,318,757		2,157,558
Expenses
Operating
Rental	281,702		258,281		825,805		764,373
Hotel	8,548		3,946		19,832		7,993
General and administrative	32,519		34,560		110,378		117,924
Payroll and related costs from management services contracts	3,900		3,006		11,204		9,166
Transaction costs	1,650		1,888		2,146		2,970
Depreciation and amortization	188,969		177,677		546,271		533,255
Total expenses	517,288		479,358		1,515,636		1,435,681
Other income (expense)
Loss from unconsolidated joint ventures	(3,524)		(5,597)		(1,389)		(1,745)
Gains on sales of real estate	262,357		348		385,349		8,104
Interest and other income (loss)	3,728		1,520		6,151		4,140
Other income - assignment fee	—		—		6,624		—
Gains (losses) from investments in securities	(1,571)		(190)		(8,549)		3,744
Losses from early extinguishment of debt	—		—		—		(898)
Interest expense	(111,846)		(105,794)		(317,216)		(320,015)
Net income	422,379		140,985		874,091		415,207
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnerships	(18,801)		(18,971)		(54,896)		(52,602)
Net income attributable to Boston Properties Limited Partnership	403,578		122,014		819,195		362,605
Preferred distributions	—		—		—		(2,560)
Preferred unit redemption charge	—		—		—		(6,412)
Net income attributable to Boston Properties Limited Partnership common unitholders	$	403,578	$	122,014	$	819,195	$	353,633
Basic earnings per common unit attributable to Boston Properties Limited Partnership
Net income	$	2.31	$	0.70	$	4.69	$	2.04
Weighted average number of common units outstanding	174,416		173,194		174,339		173,078
Diluted earnings per common unit attributable to Boston Properties Limited Partnership
Net income	$	2.30	$	0.70	$	4.68	$	2.04
Weighted average number of common and common equivalent units outstanding	174,795		173,609		174,775		173,410

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

11

BOSTON PROPERTIES LIMITED PARTNERSHIP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(unaudited and in thousands)

	Three months ended September 30,				Nine months ended September 30,
	2022		2021		2022		2021
Net income	$	422,379	$	140,985	$	874,091	$	415,207
Other comprehensive income:
Effective portion of interest rate contracts	10,800		1,088		18,400		5,482
Amortization of interest rate contracts (1)	1,677		1,676		5,030		5,028
Other comprehensive income	12,477		2,764		23,430		10,510
Comprehensive income	434,856		143,749		897,521		425,717
Comprehensive income attributable to noncontrolling interests	(18,945)		(19,115)		(55,328)		(53,034)
Comprehensive income attributable to Boston Properties Limited Partnership	$	415,911	$	124,634	$	842,193	$	372,683

_______________

(1)Amounts reclassified from comprehensive income primarily to interest expense within Boston Properties Limited Partnership’s Consolidated Statements of Operations.

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

12

BOSTON PROPERTIES LIMITED PARTNERSHIP CONSOLIDATED STATEMENTS OF CAPITAL AND NONCONTROLLING INTERESTS (unaudited and in thousands)
	Units		Capital
	General Partner	Limited Partner	Partners’ Capital (General and Limited Partners)		Accumulated Other Comprehensive Loss		Noncontrolling Interests - Property Partnerships		Total Capital		Noncontrolling Interests - Redeemable Partnership Units
Equity, June 30, 2022	1,750	154,977	$	4,716,430	$	(27,077)	$	1,552,706	$	6,242,059	$	1,646,678
Net activity from contributions and unearned compensation	—	2	2,082		—		—		2,082		6,882
Allocated net income for the period	—	—	362,818		—		18,801		381,619		40,760
Distributions	—	—	(153,620)		—		—		(153,620)		(17,930)
Conversion of redeemable partnership units	—	26	959		—		—		959		(959)
Adjustment to reflect redeemable partnership units at redemption value	—	—	268,916		—		—		268,916		(268,916)
Effective portion of interest rate contracts	—	—	—		9,709		—		9,709		1,091
Amortization of interest rate contracts	—	—	—		1,377		144		1,521		156
Distributions to noncontrolling interests in property partnerships	—	—	—		—		(20,150)		(20,150)		—
Equity, September 30, 2022	1,750	155,005	$	5,197,585	$	(15,991)	$	1,551,501	$	6,733,095	$	1,407,762
Equity, June 30, 2021	1,737	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, 2021	1,737	154,470	$	4,209,117	$	(40,803)	$	1,728,101	$	5,896,415	$	1,893,611

13

BOSTON PROPERTIES LIMITED PARTNERSHIP CONSOLIDATED STATEMENTS OF CAPITAL AND NONCONTROLLING INTERESTS (unaudited and in thousands)
	Units		Capital
	General Partner	Limited Partner	Partners’ Capital (General and Limited Partners)		Preferred Units		Accumulated Other Comprehensive Loss		Noncontrolling Interests - Property Partnerships		Total Capital		Noncontrolling Interests - Redeemable Partnership Units
Equity, December 31, 2021	1,746	154,799	$	4,173,290	$	—	$	(36,662)	$	1,556,553	$	5,693,181	$	2,078,603
Net activity from contributions and unearned compensation	1	31	6,967		—		—		—		6,967		39,543
Allocated net income for the period	—	—	736,374		—		—		54,896		791,270		82,821
Distributions	—	—	(460,789)		—		—		—		(460,789)		(53,789)
Conversion of redeemable partnership units	3	175	6,388		—		—		—		6,388		(6,388)
Adjustment to reflect redeemable partnership units at redemption value	—	—	735,355		—		—		—		735,355		(735,355)
Effective portion of interest rate contracts	—	—	—		—		16,540		—		16,540		1,860
Amortization of interest rate contracts	—	—	—		—		4,131		432		4,563		467
Contributions from noncontrolling interests in property partnerships	—	—	—		—		—		849		849		—
Distributions to noncontrolling interests in property partnerships	—	—	—		—		—		(61,229)		(61,229)		—
Equity, September 30, 2022	1,750	155,005	$	5,197,585	$	—	$	(15,991)	$	1,551,501	$	6,733,095	$	1,407,762
Equity, December 31, 2020	1,731	153,988	$	4,554,639	$	193,623	$	(49,890)	$	1,726,933	$	6,425,305	$	1,643,024
Net activity from contributions and unearned compensation	4	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 units	2	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, 2021	1,737	154,470	$	4,209,117	$	—	$	(40,803)	$	1,728,101	$	5,896,415	$	1,893,611

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

14

BOSTON PROPERTIES LIMITED PARTNERSHIP CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited and in thousands)
	Nine months ended September 30,
	2022		2021
Cash flows from operating activities:
Net income	$	874,091	$	415,207
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	546,271		533,255
Amortization of right of use assets - operating leases	1,843		3,208
Non-cash compensation expense	44,208		43,098
Loss from unconsolidated joint ventures	1,389		1,745
Distributions of net cash flow from operations of unconsolidated joint ventures	20,511		18,462
Losses (gains) from investments in securities	8,549		(3,744)
Allowance for current expected credit losses	(476)		(758)
Non-cash portion of interest expense	19,704		17,584
Settlement of accreted debt discount on redemption of unsecured senior notes	—		(6,290)
Losses from early extinguishments of debt	—		898
Other income - assignment fee	(6,624)		—
Gains on sales of real estate	(385,349)		(8,104)
Change in assets and liabilities:
Tenant and other receivables, net	4,133		13,738
Notes receivable, net	(152)		(419)
Accrued rental income, net	(76,268)		(74,283)
Prepaid expenses and other assets	(46,104)		(61,019)
Lease liabilities - operating leases	447		(24,023)
Accounts payable and accrued expenses	3,167		26,097
Accrued interest payable	(2,900)		(18,237)
Other liabilities	(35,490)		(51,938)
Tenant leasing costs	(58,547)		(37,618)
Total adjustments	38,312		371,652
Net cash provided by operating activities	912,403		786,859
Cash flows from investing activities:
Acquisitions of real estate	(1,320,273)		(218,679)
Construction in progress	(384,083)		(381,104)
Building and other capital improvements	(112,755)		(103,840)
Tenant improvements	(139,986)		(218,878)
Proceeds from sales of real estate	695,231		—
Proceeds from assignment fee	6,624		—
Capital contributions to unconsolidated joint ventures	(109,643)		(95,462)
Capital distributions from unconsolidated joint ventures	36,622		122
Proceeds from sale of investment in unconsolidated joint venture	—		17,789
Proceeds from notes receivable	10,000		—
Investments in securities, net	5,043		1,684
Net cash used in investing activities	(1,313,220)		(998,368)
Cash flows from financing activities:
Repayments of mortgage notes payable	—		(13,261)
Proceeds from unsecured senior notes	—		1,695,996
Redemption of unsecured senior notes	—		(843,710)

15

BOSTON PROPERTIES LIMITED PARTNERSHIP CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited and in thousands)
	Nine months ended September 30,
	2022		2021
Borrowings on unsecured line of credit	885,000		300,000
Repayments of unsecured line of credit	(690,000)		(300,000)
Borrowings on unsecured term loan	730,000		—
Repayment of unsecured term loan	—		(500,000)
Redemption of preferred units	—		(200,000)
Payments on finance lease obligations	—		1,250
Deferred financing costs	(2,230)		(20,770)
Debt prepayment and extinguishment costs	—		(185)
Net activity from equity transactions	(359)		20,028
Distributions	(513,486)		(513,381)
Contributions from noncontrolling interests in property partnerships	849		13,738
Distributions to noncontrolling interests in property partnerships	(61,229)		(65,604)
Net cash provided by (used in) financing activities	348,545		(425,899)
Net increase (decrease) in cash and cash equivalents and cash held in escrows	(52,272)		(637,408)
Cash and cash equivalents and cash held in escrows, beginning of period	501,158		1,719,329
Cash and cash equivalents and cash held in escrows, end of period	$	448,886	$	1,081,921
Reconciliation of cash and cash equivalents and cash held in escrows:
Cash and cash equivalents, beginning of period	$	452,692	$	1,668,742
Cash held in escrows, beginning of period	48,466		50,587
Cash and cash equivalents and cash held in escrows, beginning of period	$	501,158	$	1,719,329
Cash and cash equivalents, end of period	$	375,774	$	1,002,728
Cash held in escrows, end of period	73,112		79,193
Cash and cash equivalents and cash held in escrows, end of period	$	448,886	$	1,081,921
Supplemental disclosures:
Cash paid for interest	$	339,067	$	358,015
Interest capitalized	$	40,048	$	36,632
Non-cash investing and financing activities:
Write-off of fully depreciated real estate	$	(95,996)	$	(157,794)
Change in real estate included in accounts payable and accrued expenses	$	29,290	$	(22,104)
Construction in progress, net deconsolidated	$	(11,316)	$	—
Investment in unconsolidated joint ventures recorded upon deconsolidation	$	11,316	$	—
Right-of-use assets obtained in exchange for lease liabilities	$	—	$	26,887
Distributions declared but not paid	$	170,952	$	169,739
Conversions of redeemable partnership units to partners’ capital	$	6,388	$	8,033
Issuance of restricted securities to employees and non-employee directors	$	48,605	$	44,257

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

16

BOSTON PROPERTIES, INC. AND BOSTON PROPERTIES LIMITED PARTNERSHIP

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

1. Organization

BXP is a fully integrated, self-administered and self-managed REIT. BXP is the sole general partner of BPLP, its operating partnership, and at September 30, 2022 owned an approximate 89.6% (89.7% at December 31, 2021) general and limited partnership interest in BPLP. Unless stated otherwise or the context requires, the “Company” refers to BXP and its subsidiaries, including BPLP and its consolidated subsidiaries. Partnership interests in BPLP include:

•common units of partnership interest (also referred to as “OP Units”) and

•long term incentive units of partnership interest (also referred to as “LTIP Units”).

Unless specifically noted otherwise, all references to OP Units exclude units held by BXP. A holder of an OP Unit may present the OP Unit to BPLP 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 one year from issuance). Upon presentation of an OP Unit for redemption, BPLP is obligated to redeem the OP Unit for cash equal to the value of a share of common stock of BXP (“Common Stock”). In lieu of such cash redemption, BXP may elect to acquire the OP Unit for one share of Common Stock. Because the number of shares of Common Stock outstanding at all times equals the number of OP Units that BXP owns, one share of Common Stock is generally the economic equivalent of one 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 time-based, restricted equity compensation and as a form of performance-based equity compensation for employees, and has previously granted LTIP Units in the form of (1) 2012 outperformance plan awards (“2012 OPP Units”) and (2) 2013 - 2022 multi-year, long-term incentive program awards (also referred to as “MYLTIP Units”), each of which, upon the satisfaction of certain performance-based and time-based vesting conditions, is convertible into one OP Unit. The three-year measurement periods for the 2012 OPP Units and the 2013 - 2019 MYLTIP Units have ended and BXP’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 2020 - 2022 MYLTIP Units differ from other LTIP Units granted to employees (including the 2012 OPP Units and the 2013 - 2019 MYLTIP Units, which have been earned). Therefore, unless specifically noted otherwise, all references to LTIP Units exclude the 2020 - 2022 MYLTIP Units. LTIP Units (including the earned 2012 OPP Units and the earned 2013 - 2019 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 and 12).

Properties

At September 30, 2022, the Company owned or had joint venture interests in a portfolio of 193 commercial real estate properties (the “Properties”) aggregating approximately 53.5 million net rentable square feet of primarily premier workplaces, including 14 properties under construction/redevelopment totaling approximately 4.4 million net rentable square feet. At September 30, 2022, the Properties consisted of:

•173 office properties (including 12 properties under construction/redevelopment);

•12 retail properties (including one property under redevelopment);

•seven residential properties (including one property under construction); and

•one hotel.

The Company considers premier workplaces to be well-located buildings that are modern structures or have been modernized to compete with newer buildings and professionally managed and maintained. As such, these properties attract high-quality clients and command upper-tier rental rates.

2. Basis of Presentation and Summary of Significant Accounting Policies

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 securities of BXP. 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

17

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 (the “SEC”). 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, 2021.

The Company bases its estimates on historical experience and on various other assumptions that it considers to be reasonable under the circumstances, including the impact of extraordinary events such as the coronavirus (“COVID-19”) pandemic, the results of which form the basis for making significant judgments about the carrying values of assets and liabilities, assessments of future collectability, and other areas of the 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 for 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 six of the seven entities that are VIEs.

Consolidated Variable Interest Entities

As of September 30, 2022, BXP has identified six consolidated VIEs, including BPLP. Excluding BPLP, the VIEs consisted of the following five in-service properties: 767 Fifth Avenue (the General Motors Building), Times Square Tower, 601 Lexington Avenue, Atlantic Wharf Office Building and 100 Federal Street.

The Company consolidates these VIEs because it is the primary beneficiary.  The third parties’ interests in these consolidated entities (excluding BPLP’s interest) are reflected as noncontrolling interests in property partnerships in the accompanying consolidated financial statements (See Note 8).

In addition, BXP’s only significant asset is its investment in BPLP and, consequently, substantially all of BXP’s assets and liabilities are the assets and liabilities of BPLP.

Variable Interest Entities Not Consolidated

The Company has determined that the Platform 16 Holdings LP joint venture is a VIE. The Company does not consolidate this entity as the Company does not have the power to direct the activities that, when taken together, most significantly impact the VIE’s performance and, therefore, the Company is not considered to be the primary beneficiary.

Fair 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 Standards Codification (“ASC”) 820 “Fair Value Measurements and Disclosures” (“ASC 820”)).

18

Financial Instrument	Level
Unsecured senior notes (1)	Level 1
Related party note receivable	Level 3
Notes receivable	Level 3
Mortgage notes payable	Level 3
Unsecured line of credit	Level 3
Unsecured term loan	Level 3

_______________

(1)If trading value for the period is low, the valuation could be categorized as Level 2.

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 those estimates.

The Company’s estimated fair values for these instruments as of the end of the applicable reporting period are not projections of, nor necessarily indicative of, estimated or actual fair values in future reporting periods.

The following table presents the aggregate carrying value of the Company’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 Company’s corresponding estimate of fair value as of September 30, 2022 and December 31, 2021 (in thousands):

	September 30, 2022				December 31, 2021
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Related party note receivable, net	$	78,592	$	79,614	$	78,336	$	82,867
Notes receivable, net	—		—		9,641		10,000
Total	$	78,592	$	79,614	$	87,977	$	92,867
Mortgage notes payable, net	$	3,271,157	$	2,788,779	$	3,267,914	$	3,395,569
Unsecured senior notes, net	9,491,714		8,261,816		9,483,695		9,966,591
Unsecured line of credit	340,000		338,247		145,000		145,317
Unsecured term loan, net	730,000		730,000		—		—
Total	$	13,832,871	$	12,118,842	$	12,896,609	$	13,507,477

3. Real Estate

BXP

Real estate consisted of the following at September 30, 2022 and December 31, 2021 (in thousands):

	September 30, 2022		December 31, 2021
Land	$	5,208,688	$	5,061,169
Right of use assets - finance leases	237,505		237,507
Right of use assets - operating leases	167,935		169,778
Land held for future development (1)	601,676		560,355
Buildings and improvements	15,598,033		14,291,214
Tenant improvements	3,061,686		2,894,025
Furniture, fixtures and equipment	52,126		51,695
Construction in progress	670,167		894,172
Total	25,597,816		24,159,915
Less: Accumulated depreciation	(6,170,472)		(5,883,961)
	$	19,427,344	$	18,275,954

_______________

(1)Includes pre-development costs.

19

BPLP

Real estate consisted of the following at September 30, 2022 and December 31, 2021 (in thousands):

	September 30, 2022		December 31, 2021
Land	$	5,113,979	$	4,964,986
Right of use assets - finance leases	237,505		237,507
Right of use assets - operating leases	167,935		169,778
Land held for future development (1)	601,676		560,355
Buildings and improvements	15,325,228		14,014,010
Tenant improvements	3,061,686		2,894,025
Furniture, fixtures and equipment	52,126		51,695
Construction in progress	670,167		894,172
Total	25,230,302		23,786,528
Less: Accumulated depreciation	(6,055,172)		(5,772,018)
	$	19,175,130	$	18,014,510

_______________

(1)Includes pre-development costs.

Acquisitions

On May 17, 2022, the Company completed the acquisition of Madison Centre in Seattle, Washington for a net purchase price, including transaction costs, of approximately $724.3 million. The acquisition was completed using the proceeds from BPLP’s $730.0 million unsecured term loan (See Note 6). Madison Centre is an approximately 755,000 net rentable square foot, 37-story, LEED-Platinum certified, premier workplace. The following table summarizes the allocation of the purchase price, including transaction costs, of Madison Centre at the date of acquisition (in thousands):

Land	$	104,641
Building and improvements	505,766
Tenant improvements	58,570
In-place lease intangibles	74,598
Above-market lease intangibles	3,794
Below-market lease intangibles	(23,114)
Net assets acquired	$	724,255

The following table summarizes the estimated annual amortization of the acquired in-place lease intangibles and the acquired above- and below-market lease intangibles for Madison Centre from May 17, 2022 through the remainder of 2022 and each of the five succeeding fiscal years (in thousands):

	Acquired In-Place Lease Intangibles		Acquired Above-Market Lease Intangibles		Acquired Below-Market Lease Intangibles
Period from May 17, 2022 through December 31, 2022	$	7,266	$	640	$	2,011
2023	12,200		1,098		3,442
2024	10,842		254		3,411
2025	10,770		254		3,398
2026	10,306		254		3,210
2027	9,161		254		2,805

Madison Centre contributed approximately $18.8 million of revenue and approximately $1.3 million of net income to the Company for the period from May 17, 2022 through September 30, 2022.

20

On September 16, 2022, the Company acquired 125 Broadway in Cambridge, Massachusetts for a net purchase price, including transaction costs, of approximately $592.4 million. The acquisition was completed with available cash and borrowings under BPLP’s unsecured credit facility. 125 Broadway is a 271,000 net rentable square foot, six-story, laboratory/life sciences property. The following table summarizes the allocation of the purchase price, including transaction costs, of 125 Broadway at the date of acquisition (in thousands):

Land	$	126,364
Building and improvements	403,588
Tenant improvements	30,074
In-place lease intangibles	49,137
Below-market lease intangibles	(16,725)
Net assets acquired	$	592,438

The following table summarizes the estimated annual amortization of the acquired in-place lease intangibles and the acquired below-market lease intangible for 125 Broadway from September 16, 2022 through the remainder of 2022 and each of the five succeeding fiscal years (in thousands):

	Acquired In-Place Lease Intangibles		Acquired Below-Market Lease Intangible
Period from September 16, 2022 through December 31, 2022	$	2,185	$	744
2023	8,740		2,975
2024	8,740		2,975
2025	8,740		2,975
2026	8,740		2,975
2027	8,740		2,975

125 Broadway contributed approximately $1.6 million of revenue and approximately $0.4 million of net income to the Company for the period from September 16, 2022 through September 30, 2022.

Dispositions

On March 31, 2022, the Company completed the sale of 195 West Street located in Waltham, Massachusetts for a gross sale price of $37.7 million. Net cash proceeds totaled approximately $35.4 million, resulting in a gain on sale of real estate totaling approximately $22.7 million for BXP and approximately $23.4 million for BPLP. 195 West Street is an approximately 63,500 net rentable square foot office property. 195 West Street contributed approximately $0.4 million of net income to the Company from January 1, 2022 through March 30, 2022 and contributed approximately $0.4 million and $0.2 million of net income to the Company for the three and nine months ended September 30, 2021, respectively.

On April 19, 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. On April 7, 2022, the Company executed an agreement to assign its right to acquire 11251 Roger Bacon Drive to a third party for an assignment fee of approximately $6.9 million. Net cash proceeds totaled approximately $6.6 million and is reflected as Other income - assignment fee in the Company's Consolidated Statements of Operations. 11251 Roger Bacon Drive is an approximately 65,000 square foot office building situated on approximately 2.6 acres. The property was 100% leased.

On June 15, 2022, the Company completed the sale of its suburban Virginia 95 Office Park properties located in Springfield, Virginia for an aggregate gross sale price of $127.5 million. Net cash proceeds totaled approximately $121.9 million, resulting in a gain on sale of real estate totaling approximately $96.2 million for BXP and approximately $99.5 million for BPLP. Virginia 95 Office Park consists of eleven office/flex properties aggregating approximately 733,000 net rentable square feet. Virginia 95 Office Park contributed approximately $2.3 million of net income to the Company from January 1, 2022 through June 14, 2022 and contributed approximately $1.8 million and $5.9 million of net income to the Company for the three and nine months ended September 30, 2021, respectively.

21

On August 30, 2022, the Company completed the sale of 601 Massachusetts Avenue located in Washington, DC for a gross sale price of $531.0 million. Net cash proceeds totaled approximately $512.3 million, resulting in a gain on sale of real estate of approximately $237.4 million for BXP and approximately $237.5 million for BPLP. 601 Massachusetts Avenue is an approximately 479,000 net rentable square foot premier workplace. 601 Massachusetts Avenue contributed approximately $3.6 million and $14.9 million of net income to the Company for the period from July 1, 2022 through August 29, 2022 and the period from January 1, 2022 through August 29, 2022, respectively, and contributed approximately $5.6 million and $16.7 million of net income to the Company for the three and nine months ended September 30, 2021, respectively.

On September 15, 2022, the Company completed the sale of two parcels of land located in Loudoun County, Virginia for an aggregate gross sale price of $27.0 million. Net cash proceeds totaled approximately $25.6 million, resulting in a gain on sale of real estate totaling approximately $24.4 million for BXP and BPLP.

Developments

On April 27, 2022, the Company entered into a 15-year lease agreement with AstraZeneca for approximately 570,000 net rentable square feet at the Company’s 290 Binney Street future development project. 290 Binney Street is part of the initial phase of a future life sciences development project located in the heart of Kendall Square in Cambridge, Massachusetts. The full project will consist of two buildings aggregating approximately 1.1 million rentable square feet of life sciences space and an approximately 400,000 square foot residential building. The lease and commencement of construction are subject to various conditions, some of which are not within the Company’s control. There can be no assurance that the conditions will be satisfied or that the Company will commence the development on the terms and schedule currently contemplated or at all.

On April 29, 2022, the Company partially placed in-service 2100 Pennsylvania Avenue, a premier workplace project with approximately 480,000 net rentable square feet located in Washington, DC.

On May 13, 2022, the Company commenced the development of Reston Next Office Phase II, a premier workplace project located in Reston, Virginia. When completed, the building will consist of approximately 90,000 net rentable square feet.

On June 29, 2022, the Company completed and fully placed in-service 325 Main Street, a premier workplace project with approximately 414,000 net rentable square feet located in Cambridge, Massachusetts.

On July 1, 2022, the Company commenced the redevelopment of 140 Kendrick Street, a premier workplace that consists of three buildings aggregating approximately 388,000 net rentable square feet located in Needham, Massachusetts. The redevelopment is a repositioning of one building consisting of approximately 90,000 net rentable square feet into a net zero, carbon neutral premier workplace building, as defined by the LEED Zero Carbon Certification. When completed, the building will consist of approximately 104,000 net rentable square feet.

On July 15, 2022, the Company partially placed in-service 880 Winter Street, an approximately 244,000 net rentable square foot laboratory/life sciences project located in Waltham, Massachusetts.

On September 8, 2022, the Company terminated its existing lease agreement with its client at 300 Binney Street to facilitate the conversion and expansion of the property. 300 Binney Street is a premier workplace with approximately 195,000 net rentable square feet at Kendall Center in Cambridge, Massachusetts that will be redeveloped into approximately 240,000 net rentable square feet of laboratory/life sciences space. The commencement of construction is subject to various conditions. There can be no assurance that the Company will commence the redevelopment on the terms and schedule currently contemplated or at all.

On September 12, 2022, the Company commenced the redevelopment of 760 Boylston Street, a retail project at the Prudential Center located in Boston, Massachusetts. The redevelopment is a modernization of the space consisting of approximately 118,000 net rentable square feet.

4. Leases

The Company estimates the collectability of its accrued rent and accounts receivable balances related to lease revenue. When evaluating the collectability of these accrued rent and accounts receivable balances, management considers client creditworthiness, current economic trends, including the impact of the COVID-19 pandemic on clients’ businesses, and changes in clients’ payment patterns, on a lease-by-lease basis.

22

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. The write-offs were for clients, 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.

During the nine months ended September 30, 2022, the Company determined it was probable of collecting substantially all of certain clients’ accrued rent and account receivable balances and, therefore, ceased recognizing revenue from such clients on a cash basis. As a result of returning these clients to accrual basis accounting, the Company reinstated approximately $1.5 million of accrued rent balances during the nine months ended September 30, 2022. There was no reinstatement of accrued rent balances during the three months ended September 30, 2022.

For information related to write-offs of accrued rent, net balances and accounts receivable, net balances and reinstatements of accrued rent balances for the Company’s unconsolidated joint ventures, see Note 5.

Lessor

The following table summarizes the components of lease revenue recognized during the three and nine months ended September 30, 2022 and 2021 included within the Company's Consolidated Statements of Operations (in thousands):

	Three months ended September 30,				Nine months ended September 30,
Lease Revenue	2022		2021		2022		2021
Fixed contractual payments	$	610,878	$	581,393	$	1,811,836	$	1,732,930
Variable lease payments	128,377		110,867		367,438		329,172
	$	739,255	$	692,260	$	2,179,274	$	2,062,102

23

5. Investments in Unconsolidated Joint Ventures

The investments in unconsolidated joint ventures consist of the following at September 30, 2022 and December 31, 2021:

					Carrying Value of Investment (1)
Entity	Properties	Nominal % Ownership			September 30, 2022		December 31, 2021
					(in thousands)
Square 407 Limited Partnership	Market Square North	50.00	%		$	(5,759)	$	(1,205)
BP/CRF Metropolitan Square LLC	Metropolitan Square	20.00	%		(39,318)		(15,356)
901 New York, LLC	901 New York Avenue	25.00	%	(2)	(12,506)		(12,597)
WP Project Developer LLC	Wisconsin Place Land and Infrastructure	33.33	%	(3)	32,638		33,732
500 North Capitol Venture LLC	500 North Capitol Street, NW	30.00	%		(9,432)		(7,913)
501 K Street LLC	1001 6th Street	50.00	%	(4)	42,922		42,576
Podium Developer LLC	The Hub on Causeway - Podium	50.00	%		48,571		48,980
Residential Tower Developer LLC	Hub50House	50.00	%		45,662		47,774
Hotel Tower Developer LLC	The Hub on Causeway - Hotel Air Rights	50.00	%		12,165		11,505
Office Tower Developer LLC	100 Causeway Street	50.00	%		59,379		57,687
1265 Main Office JV LLC	1265 Main Street	50.00	%		3,358		3,541
BNY Tower Holdings LLC	Dock 72	50.00	%		26,947		27,343
BNYTA Amenity Operator LLC	Dock 72	50.00	%		825		1,069
CA-Colorado Center, LLC	Colorado Center	50.00	%		234,271		231,479
7750 Wisconsin Avenue LLC	7750 Wisconsin Avenue	50.00	%		52,656		61,626
BP-M 3HB Venture LLC	3 Hudson Boulevard	25.00	%		116,678		116,306
SMBP Venture LP	Santa Monica Business Park	55.00	%		166,302		156,639
Platform 16 Holdings LP	Platform 16	55.00	%	(5)	143,558		109,086
Gateway Portfolio Holdings LLC	Gateway Commons	50.00	%	(6)	314,137		327,148
Rosecrans-Sepulveda Partners 4, LLC	Beach Cities Media Campus	50.00	%		27,017		27,106
Safeco Plaza REIT LLC	Safeco Plaza	33.67	%	(7)	70,889		72,545
360 PAS Holdco LLC	360 Park Avenue South	42.21	%	(8)	112,772		106,855
PR II/BXP Reston Gateway LLC	Reston Next Residential	20.00	%	(9)	11,267		N/A
751 Gateway Holdings LLC	751 Gateway	49.00	%	(6)	71,820		N/A
					$	1,526,819	$	1,445,926

 _______________

(1)Investments with deficit balances aggregating approximately $67.0 million and $37.1 million at September 30, 2022 and December 31, 2021, respectively, 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, 2022 and December 31, 2021, 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.

(4)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 in excess of 520,000 square feet and achieving certain project returns at stabilization.

(5)This entity is a VIE (See Note 2).

(6)On June 16, 2022, in accordance with the Gateway Commons joint venture agreement, 751 Gateway was segregated into a new single-purpose joint venture.

(7)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 through which each partner owns its interest in the joint venture.

(8)The Company’s ownership includes (1) a 35.79% direct interest in the joint venture, (2) an additional 5.837% indirect ownership in the joint venture, and (3) an additional 1% interest in each of the two entities through which each partner owns its interest in the joint venture. The Company’s partners will fund required capital until their aggregate investment is

24

approximately 58% of all capital contributions; thereafter, the partners will fund required capital according to their percentage interests.

(9)The Company’s partner will fund required capital until its aggregate investment is approximately 80% of all capital contributions; thereafter, the partners will fund required capital according to their percentage interests.

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. 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.

The combined summarized balance sheets of the Company’s unconsolidated joint ventures are as follows: 

	September 30, 2022		December 31, 2021
	(in thousands)
ASSETS
Real estate and development in process, net (1)	$	5,858,271	$	5,579,218
Other assets	655,549		586,470
Total assets	$	6,513,820	$	6,165,688
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY
Mortgage and notes payable, net	$	3,425,972	$	3,214,961
Other liabilities (2)	681,228		652,135
Members’/Partners’ equity	2,406,620		2,298,592
Total liabilities and members’/partners’ equity	$	6,513,820	$	6,165,688
Company’s share of equity	$	1,180,507	$	1,104,175
Basis differentials (3)	346,312		341,751
Carrying value of the Company’s investments in unconsolidated joint ventures (4)	$	1,526,819	$	1,445,926

_______________

(1)At September 30, 2022 and December 31, 2021, this amount included right of use assets - finance leases totaling approximately $248.9 million. At September 30, 2022 and December 31, 2021, this amount included right of use assets - operating leases totaling approximately $21.4 million and $22.3 million, respectively.

(2)At September 30, 2022 and December 31, 2021, this amount included lease liabilities - finance leases totaling approximately $383.0 million and $385.5 million, respectively. At September 30, 2022 and December 31, 2021, this amount included lease liabilities - operating leases totaling approximately $30.5 million and $30.4 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, 2022		December 31, 2021
Property	(in thousands)
Colorado Center	$	302,539	$	304,776
Gateway Commons	51,188		51,009
Dock 72	(48,753)		(50,051)

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 $67.0 million and $37.1 million at September 30, 2022 and December 31, 2021, respectively, are reflected within Other Liabilities in the Company’s Consolidated Balance Sheets.

25

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,
	2022		2021		2022		2021
	(in thousands)
Total revenue (1)	$	127,996	$	90,009	$	373,358	$	268,501
Expenses
Operating	52,886		40,378		143,880		114,299
Transaction costs	(65)		—		746		7
Depreciation and amortization	44,132		36,036		132,089		103,766
Total expenses	96,953		76,414		276,715		218,072
Other income (expense)
Loss from early extinguishment of debt	—		—		(1,327)		—
Interest expense	(40,678)		(27,519)		(103,270)		(78,711)
Net loss	$	(9,635)	$	(13,924)	$	(7,954)	$	(28,282)
Company’s share of net income (loss)	$	(2,251)	$	(4,491)	$	2,225	$	(10,268)
Gain on sale of investment (2)	—		—		—		10,257
Basis differential (3)	(1,273)		(1,106)		(3,614)		(1,734)
Loss from unconsolidated joint ventures	$	(3,524)	$	(5,597)	$	(1,389)	$	(1,745)

_______________ 

(1)Includes straight-line rent adjustments of approximately $9.6 million and $5.5 million for the three months ended September 30, 2022 and 2021, respectively, and approximately $54.9 million and $11.6 million for the nine months ended September 30, 2022 and 2021, respectively. For the nine months ended September 30, 2022, reinstatement of accrued rent balances totaled approximately $2.5 million.

(2)During the nine months ended September 30, 2021, the Company completed 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 for each of the three months ended September 30, 2022 and 2021, and approximately $0.3 million and $0.7 million for the nine months ended September 30, 2022 and 2021, respectively. Also includes net above-/below-market rent adjustments of approximately $0.1 million for each of the three months ended September 30, 2022 and 2021, and approximately $0.3 million and $0.2 million for the nine months ended September 30, 2022 and 2021, respectively.

On January 18, 2022, a joint venture in which the Company has a 50% interest commenced the redevelopment of 651 Gateway located in South San Francisco, California. 651 Gateway is a premier workplace that is being converted to approximately 327,000 net rentable square feet of life sciences space.

On February 2, 2022, a joint venture in which the Company has a 55% interest commenced the development of the first phase of Platform 16, a premier workplace project located in San Jose, California, that is expected to contain approximately 1.1 million net rentable square feet upon completion. The first phase of the development projects includes the construction of an approximately 390,000 net rentable square foot premier workplace building and a below-grade parking garage.

On March 28, 2022, a joint venture in which the Company has a 20% interest refinanced with a new lender the debt secured by its Metropolitan Square property located in Washington, DC. At the time of the refinancing, the loan had an outstanding balance of approximately $294.1 million, bore interest at a variable rate equal to (1) the greater of (x) LIBOR or (y) 0.65%, plus (2) 4.75% per annum and was scheduled to mature on July 7, 2022, with two, one-year extension options, subject to certain conditions. There was no prepayment penalty associated with the prepayment of the previous mortgage loan. The joint venture recognized a loss from early extinguishment of debt totaling approximately $1.3 million due to the write-off of unamortized deferred financing costs. In conjunction with the refinancing, the joint venture settled its interest rate cap agreement, entered into in 2020, to limit its exposure to increases in the LIBOR rate. The new mortgage and mezzanine loans have an aggregate principal balance of $420.0 million, bear interest at a weighted average variable rate equal to the Secured Overnight Financing Rate (“SOFR“) plus 2.75% per annum and mature on April 9, 2024, with three, one-year extension options, subject to certain conditions. The joint venture distributed excess loan proceeds from the new mortgage and mezzanine loans

26

totaling approximately $100.5 million, of which the Company’s share totaled approximately $20.1 million. On September 1, 2022, the joint venture entered into an interest rate cap agreement that capped SOFR at 4.50% per annum on a notional amount of $420.0 million through April 15, 2024. Metropolitan Square is a premier workplace with approximately 657,000 net rentable square feet located in Washington, DC.

On April 18, 2022, a joint venture in which the Company has a 50% ownership interest extended the maturity date of the construction loan collateralized by its Hub50House property to June 19, 2022. At the time of the extension, the outstanding balance of the loan totaled approximately $176.5 million, bore interest at a variable rate equal to LIBOR plus 2.00% per annum and was scheduled to mature on April 19, 2022. On June 17, 2022, the joint venture repaid the existing construction loan and obtained a new mortgage loan. The new mortgage loan has a principal balance of $185.0 million, bears interest at a variable rate equal to SOFR plus 1.35% per annum and matures on June 17, 2032. At closing, the joint venture entered into interest rate swap contracts with notional amounts aggregating $185.0 million through April 10, 2032, resulting in a fixed rate of approximately 4.432% per annum through the expiration of the interest rate swap contracts. In conjunction with the new mortgage loan, the joint venture paid off the existing construction loan. At the time of the payoff of the construction loan, the outstanding balance of the loan totaled approximately $176.7 million. The joint venture distributed excess loan proceeds from the new mortgage loan totaling approximately $6.8 million, of which the Company’s share totaled approximately $3.4 million. Hub50House is a residential property that consists of approximately 320,000 net rentable square feet and 440 residential units located in Boston, Massachusetts.

On May 13, 2022, the Company entered into a joint venture with a third party to own, operate and develop Reston Next Residential located in Reston, Virginia. Reston Next Residential is expected to consist of 508 residential rental units upon completion. The Company contributed approximately $11.3 million of improvements at closing and will contribute cash totaling approximately $3.5 million in the future for its 20% ownership interest in the joint venture. The partner contributed approximately $0.5 million of cash at closing and will contribute cash totaling approximately $58.7 million in the future for its 80% ownership interest in the joint venture. As a result of the partner’s deferred contribution, as of the acquisition date, the Company owned an approximately 96% interest in the joint venture. On May 13, 2022, the joint venture commenced development and entered into a construction loan collateralized by the property. The construction loan has a principal amount of up to $140.0 million, bears interest at a variable rate equal to SOFR plus 2.00% per annum and matures on May 13, 2026, with two, one-year extension options, subject to certain conditions.

On June 16, 2022, the Company entered into a joint venture with a third party to own, operate and develop 751 Gateway, a laboratory building located in South San Francisco, California, that is expected to be approximately 231,000 net rentable square feet upon completion. 751 Gateway was previously part of the Company’s Gateway Commons joint venture. The Company contributed assets with an agreed upon value aggregating approximately $53.9 million and cash totaling approximately $2.6 million for its 49% ownership interest in the joint venture. The partner contributed assets with an agreed upon value aggregating approximately $53.9 million and cash totaling approximately $4.9 million for its 51% ownership interest in the joint venture.

On August 8, 2022, a joint venture in which the Company has a 50% interest modified the construction loan collateralized by its Dock 72 property located in Brooklyn, New York. At the time of the modification, the loan had an outstanding balance totaling approximately $198.4 million, a total commitment amount of $250.0 million, bore interest at a variable rate equal to LIBOR plus 3.35% per annum, and was scheduled to mature on December 18, 2023. The modified construction loan bears interest at a variable rate equal to (1) the greater of (x) SOFR or (y) 0.25% plus (2) 3.10% per annum, has a total commitment amount of approximately $198.4 million, and continues to mature on December 18, 2023. Dock 72 is a premier workplace with approximately 669,000 net rentable square feet.

On September 9, 2022, a joint venture in which the Company has an approximate 33.67% interest modified the mortgage loan collateralized by its Safeco Plaza property located in Seattle, Washington. At the time of the modification, the loan’s outstanding balance totaled $250.0 million, bore interest at a variable rate equal to the greater of (x) 2.35% or (y) LIBOR plus 2.20% per annum, and was scheduled to mature on September 1, 2026. The modified mortgage loan bears interest at a variable rate equal to the greater of (x) 2.35% or (y) SOFR plus 2.32% per annum and continues to mature on September 1, 2026. In conjunction with the loan modification, the joint venture entered into an interest rate cap agreement that capped SOFR at 2.50% per annum on a notional amount of $250.0 million through September 1, 2023. Safeco Plaza is a premier workplace with approximately 765,000 net rentable square feet.

27

6. Unsecured Term Loan

On May 17, 2022, BPLP entered into an unsecured credit agreement (the “Unsecured Term Loan”) providing for a single borrowing of up to $730.0 million. The Unsecured Term Loan matures on May 16, 2023.

At BPLP’s option, the Unsecured Term Loan will bear interest at a rate per annum equal to (A) (1) a base rate per annum equal to the greater of (a) the federal funds rate plus 0.5%, (b) the administrative agent’s prime rate, (c) term SOFR plus 1.00% and (d) 1.00%, or (2) a term SOFR rate per annum equal to the forward-looking SOFR term rate administered by CME Group Benchmark Administration (“CME”) two business days prior to the commencement of such interest period; or if the rate is unavailable, then the forward-looking SOFR term rate administered by CME on the first business day immediately prior thereto, in each case, plus 0.10%, and (B) a margin ranging from zero to 160 basis points based on BPLP’s credit rating.

On May 17, 2022, BPLP exercised its option to draw $730.0 million under the Unsecured Term Loan (See Note 3). As of September 30, 2022, the Unsecured Term Loan bears interest at a variable rate equal to term SOFR plus 0.95% per annum based on BPLP’s credit rating at September 30, 2022. At September 30, 2022, BPLP had $730.0 million outstanding under the Unsecured Term Loan.

The Unsecured Term Loan 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 any outstanding amount under the Unsecured Term Loan. Among other covenants, the Unsecured Term Loan requires that BPLP 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. At September 30, 2022, BPLP was in compliance with each of these financial and other covenant requirements.

7. 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 clients 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 had letter of credit and performance obligations related to lender and development requirements that total approximately $26.5 million at September 30, 2022.

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. 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 may be entitled to an additional promoted interest or payments.

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, clients and other third parties for the completion of development projects. The Company has agreements with its outside or joint venture 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, 2022, the maximum funding obligation under the guarantee was approximately $14.9 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

28

payments made under the guarantee. As of September 30, 2022, no amounts related to the guarantee were recorded as liabilities in the Company’s consolidated financial statements.

In connection with the development of the 7750 Wisconsin Avenue office property located in Bethesda, Maryland, the Company entered into agreements with affiliates of The Bernstein Companies (the Company’s partner in the 7750 Wisconsin Avenue joint venture) under which the Company could be required to act as a mezzanine and/or mortgage lender and finance the construction of the hotel property being developed by an affiliate of The Bernstein Companies adjacent to the office property.   An affiliate of The Bernstein Companies exercised its option to borrow $10.0 million from the Company under such agreements, and the Company provided the financing on June 1, 2020. The financing bore interest at a fixed rate of 8.00% per annum, compounded monthly, and was scheduled to mature on the fifth anniversary of the date on which the base building of the affiliate of The Bernstein Companies’ hotel property was substantially completed. On June 27, 2022, the borrower repaid the loan in full, including approximately $1.6 million of accrued interest. The financing was recorded as Note Receivable, Net in the Company’s Consolidated Balance Sheets.

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. Each of the zoning ordinance and urban renewal plan was amended to decouple the residential requirement from the occupancy of the 325 Main Street property. 325 Main Street consisted of an approximately 115,000 net rentable square foot premier workplace that was demolished and redeveloped into an approximately 414,000 net rentable square foot premier workplace. While the amendment to the urban renewal plan is subject to completion of administrative processes, the City of Cambridge issued a temporary certificate of occupancy in the second quarter of 2022 (See Note 3).

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 $1.35 billion of property insurance in excess of the $1.0 billion of coverage in the Company’s property insurance program for 601 Lexington Avenue, New York, New York, consisting of $750 million of property and Terrorism Coverage in excess of the Company’s property insurance program and $600 million of Terrorism Coverage only in excess of the $1.75 billion of coverage. 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 the Federal Terrorism Risk Insurance Act (as amended, “TRIA”) (“NBCR Coverage”), which is provided by IXP as a direct insurer, for the properties in the 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.” The program trigger is $200 million, the coinsurance is 20% and the deductible is 20% of the premiums earned by the insurer for the year prior to 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 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.

The Company also currently carries earthquake insurance on its properties located in areas known to be subject to earthquakes. Specifically, the Company currently carries earthquake insurance which covers its San Francisco and Los Angeles regions with a $330 million per occurrence limit, and a $330 million annual aggregate limit, $30 million of which is provided 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. In addition, the Company currently carries earthquake insurance which covers its Seattle region with a $110 million per occurrence limit, and a $110 million annual aggregate limit. This insurance is subject to a deductible in the amount of 2% of the value of the affected property. The amount of the Company’s earthquake insurance coverage may not be sufficient to cover losses from earthquakes. In addition,

29

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.

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, BPLP has issued a guarantee to cover liabilities of IXP in the amount of $20.0 million.

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 pandemics, 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. Noncontrolling Interests

Noncontrolling interests relate to the interests in BPLP not owned by BXP and interests in consolidated property partnerships not wholly-owned by the Company. As of September 30, 2022, the noncontrolling interests in BPLP consisted of 16,535,172 OP Units, 1,680,123 LTIP Units (including 464,036 LTIP Units earned by employees under the Company’s multi-year long-term incentive awards granted between 2012 and 2019 (i.e., 2012 OPP and 2013 - 2019 MYLTIP awards)), 203,278 2020 MYLTIP Units, 351,218 2021 MYLTIP Units and 253,627 2022 MYLTIP Units held by parties other than BXP.

Noncontrolling Interest—Common Units

During the nine months ended September 30, 2022, 178,929 OP Units were presented by the holders for redemption (including an aggregate of 74,249 OP Units issued upon conversion of LTIP Units, 2012 OPP Units and MYLTIP Units) and were redeemed by BXP in exchange for an equal number of shares of Common Stock.

At September 30, 2022, BPLP had outstanding 203,278 2020 MYLTIP Units, 351,218 2021 MYLTIP Units and 253,627 2022 MYLTIP Units. Prior to the end of the respective three-year performance period for each plan, holders of MYLTIP Units are 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 three-year performance period for each plan has ended, (1) 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 and (2) with respect to the 2021 MYLTIP and 2022 MYLTIP only, the Company will make a “catch-up” cash payment on the MYLTIP Units that are ultimately earned in an amount equal to the regular and special dividends, if any, declared during the performance period on Common Stock, less the distributions actually paid during the performance period on all of the awarded 2021 MYLTIP Units and 2022 MYLTIP Units.

On February 4, 2022, the measurement period for the Company’s 2019 MYLTIP awards ended and, based on BXP’s relative TSR performance, the final payout was determined to be 69.0% of target, or an aggregate of approximately $8.6 million (after giving effect to employee separations). As a result, an aggregate of 144,043 2019 MYLTIP Units that had been previously granted were automatically forfeited.

30

The following table presents BPLP’s distributions on the OP Units and LTIP Units (including the 2012 OPP Units, 2013 - 2018 MYLTIP Units and, after the February 4, 2022 measurement date, the 2019 MYLTIP Units) and its distributions on the 2019 MYLTIP Units (prior to the February 4, 2022 measurement date) and 2020 - 2022 MYLTIP Units (after the February 1, 2022 issuance date of the 2022 MYLTIP Units) that occurred during the nine months ended September 30, 2022:

Record Date	Payment Date	Distributions per OP Unit and LTIP Unit	Distributions per MYLTIP Unit
September 30, 2022	October 31, 2022	$0.98	$0.098
June 30, 2022	July 29, 2022	$0.98	$0.098
March 31, 2022	April 29, 2022	$0.98	$0.098
December 31, 2021	January 28, 2022	$0.98	$0.098

The following table presents BPLP’s distributions on the OP Units and LTIP Units (including the 2012 OPP Units, 2013 - 2017 MYLTIP Units and, after the February 5, 2021 measurement date, the 2018 MYLTIP Units) and its distributions on the 2018 MYLTIP Units (prior to the February 5, 2021 measurement date) and 2019 - 2021 MYLTIP Units (after the February 2, 2021 issuance date of the 2021 MYLTIP Units) that occurred during the nine months ended September 30, 2021:

Record Date	Payment Date	Distributions per OP Unit and LTIP Unit	Distributions per MYLTIP Unit
September 30, 2021	October 29, 2021	$0.98	$0.098
June 30, 2021	July 30, 2021	$0.98	$0.098
March 31, 2021	April 30, 2021	$0.98	$0.098
December 31, 2020	January 28, 2021	$0.98	$0.098

A holder of an OP Unit may present the OP Unit to BPLP 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 one year from issuance). Upon presentation of an OP Unit for redemption, BPLP must redeem the OP Unit for cash equal to the then value of a share of Common Stock of BXP. BXP may, in its sole discretion, elect to assume and satisfy the redemption obligation by paying either cash or issuing one share of Common Stock. The value of the OP Units (other than OP Units owned by BXP), and LTIP Units (including the 2012 OPP Units and 2013 - 2019 MYLTIP Units), assuming in each case that all conditions had been met for the conversion thereof, had all of such units been redeemed at September 30, 2022 was approximately $1.4 billion based on the last reported price of a share of Common Stock on the New York Stock Exchange of $74.97 per share on September 30, 2022.

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 $1.6 billion at each of September 30, 2022 and December 31, 2021, are included in Noncontrolling Interests—Property Partnerships on the accompanying Consolidated Balance Sheets.

9. Stockholders’ Equity / Partners’ Capital

BXP

As of September 30, 2022, BXP had 156,754,712 shares of Common Stock outstanding.

As of September 30, 2022, BXP owned 1,749,700 general partnership units and 155,005,012 limited partnership units in BPLP.

On May 22, 2020, BXP 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 Stock through sales agents over a three-year period. Under the ATM stock offering program, BXP 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 replaced BXP’s prior

31

$600.0 million ATM stock offering program that was scheduled to expire on June 2, 2020. BXP 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 Stock have been issued under this ATM stock offering program.

During the nine months ended September 30, 2022, BXP did not issue any shares of Common Stock upon the exercise of options to purchase Common Stock.

During the nine months ended September 30, 2022, BXP issued 178,929 shares of Common Stock in connection with the redemption of an equal number of redeemable OP Units from limited partners.

The following table presents BXP’s dividends per share and BPLP’s distributions per OP Unit and LTIP Unit paid or declared in 2022 and during the nine months ended September 30, 2021:

Record Date	Payment Date	Dividend (Per Share)	Distribution (Per Unit)
September 30, 2022	October 31, 2022	$0.98	$0.98
June 30, 2022	July 29, 2022	$0.98	$0.98
March 31, 2022	April 29, 2022	$0.98	$0.98
December 31, 2021	January 28, 2022	$0.98	$0.98
September 30, 2021	October 29, 2021	$0.98	$0.98
June 30, 2021	July 30, 2021	$0.98	$0.98
March 31, 2021	April 30, 2021	$0.98	$0.98
December 31, 2020	January 28, 2021	$0.98	$0.98

Preferred Stock

On March 2, 2021, BXP issued a redemption notice for 80,000 shares of its 5.25% Series B Cumulative Redeemable Preferred Stock (the “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 redemption price per share of Series B Preferred Stock was $2,500, plus all accrued and unpaid dividends 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 Series B Preferred Stock, including accrued and unpaid dividends to, 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 and Series B Preferred Units of approximately $6.4 million relates to the original issuance costs and is reflected as a reduction to Net Income Attributable to Boston Properties, Inc. Common Shareholders and Net Income Attributable to Boston Properties Limited Partnership Common Unitholders on the Consolidated Income Statements.

On April 1, 2021, BXP redeemed 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, all of the Series B Preferred Units, which had terms and preferences generally mirroring those of the Series B Preferred Stock, were redeemed by BPLP.

The following table presents BXP’s dividend per share on its Series B Preferred Stock paid during the nine months ended September 30, 2021:

Record Date	Payment Date	Dividend (Per Share)
February 5, 2021	February 16, 2021	$32.8125

10. Segment Information

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 months ended September 30, 2022 and 2021.

32

BXP

	Three months ended September 30,				Nine months ended September 30,
	2022		2021		2022		2021
	(in thousands)
Net income attributable to Boston Properties, Inc. common shareholders	$	360,977	$	108,297	$	727,144	$	311,680
Add:
Preferred stock redemption charge	—		—		—		6,412
Preferred dividends	—		—		—		2,560
Noncontrolling interest—common units of the Operating Partnership	40,883		11,982		82,821		35,393
Noncontrolling interests in property partnerships	18,801		18,971		54,896		52,602
Interest expense	111,846		105,794		317,216		320,015
Losses from early extinguishment of debt	—		—		—		898
Net operating income from unconsolidated joint ventures	35,316		24,266		108,347		74,478
Loss from unconsolidated joint ventures	3,524		5,597		1,389		1,745
Depreciation and amortization expense	190,675		179,412		551,445		539,815
Transaction costs	1,650		1,888		2,146		2,970
Payroll and related costs from management services contracts	3,900		3,006		11,204		9,166
General and administrative expense	32,519		34,560		110,378		117,924
Less:
Net operating income attributable to noncontrolling interests in property partnerships	48,306		47,800		143,223		138,463
Gains (losses) from investments in securities	(1,571)		(190)		(8,549)		3,744
Other income - assignment fee	—		—		6,624		—
Interest and other income (loss)	3,728		1,520		6,151		4,140
Gains on sales of real estate	262,345		348		381,293		8,104
Direct reimbursements of payroll and related costs from management services contracts	3,900		3,006		11,204		9,166
Development and management services revenue	7,465		6,094		19,650		20,181
Company’s share of Net Operating Income	$	475,918	$	435,195	$	1,407,390	$	1,291,860

33

BPLP

	Three months ended September 30,				Nine months ended September 30,
	2022		2021		2022		2021
	(in thousands)
Net income attributable to Boston Properties Limited Partnership common unitholders	$	403,578	$	122,014	$	819,195	$	353,633
Add:
Preferred unit redemption charge	—		—		—		6,412
Preferred distributions	—		—		—		2,560
Noncontrolling interests in property partnerships	18,801		18,971		54,896		52,602
Interest expense	111,846		105,794		317,216		320,015
Losses from early extinguishment of debt	—		—		—		898
Net operating income from unconsolidated joint ventures	35,316		24,266		108,347		74,478
Loss from unconsolidated joint ventures	3,524		5,597		1,389		1,745
Depreciation and amortization expense	188,969		177,677		546,271		533,255
Transaction costs	1,650		1,888		2,146		2,970
Payroll and related costs from management services contracts	3,900		3,006		11,204		9,166
General and administrative expense	32,519		34,560		110,378		117,924
Less:
Net operating income attributable to noncontrolling interests in property partnerships	48,306		47,800		143,223		138,463
Gains (losses) from investments in securities	(1,571)		(190)		(8,549)		3,744
Other income - assignment fee	—		—		6,624		—
Interest and other income (loss)	3,728		1,520		6,151		4,140
Gains on sales of real estate	262,357		348		385,349		8,104
Direct reimbursements of payroll and related costs from management services contracts	3,900		3,006		11,204		9,166
Development and management services revenue	7,465		6,094		19,650		20,181
Company’s share of Net Operating Income	$	475,918	$	435,195	$	1,407,390	$	1,291,860

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, other income - assignment fee, interest and other income (loss), gains 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

34

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.

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), less 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 losses from early extinguishment of debt from unconsolidated joint ventures, 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 Income (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, other income - assignment fee, interest and other income (loss), gains 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 in a joint venture that acquired Safeco Plaza located in Seattle, Washington. 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.

Parking and other revenue for the three months ended September 30, 2022 increased by approximately $4.6 million compared to the three months ended September 30, 2021. Parking and other revenue for the nine months ended September 30, 2022 increased by approximately $21.5 million compared to 2021. These increases were primarily in transient and monthly parking revenue.

35

Information by geographic area and property type (dollars in thousands):

For the three months ended September 30, 2022:

	Boston			Los Angeles			New York			San Francisco			Seattle			Washington, DC			Total
Rental Revenue: (1)
Office	$	255,958		$	—		$	260,926		$	134,938		$	12,293		$	88,954		$	753,069
Residential	3,837			—			—			3,133			—			7,370			14,340
Hotel	11,749			—			—			—			—			—			11,749
Total	271,544			—			260,926			138,071			12,293			96,324			779,158
% of Grand Totals	34.85		%	—		%	33.49		%	17.72		%	1.58		%	12.36		%	100.00		%
Rental Expenses:
Office	91,226			—			99,942			47,068			3,125			33,317			274,678
Residential	1,552			—			—			2,125			—			3,347			7,024
Hotel	8,548			—			—			—			—			—			8,548
Total	101,326			—			99,942			49,193			3,125			36,664			290,250
% of Grand Totals	34.91		%	—		%	34.43		%	16.95		%	1.08		%	12.63		%	100.00		%
Net operating income	$	170,218		$	—		$	160,984		$	88,878		$	9,168		$	59,660		$	488,908
% of Grand Totals	34.81		%	—		%	32.93		%	18.18		%	1.88		%	12.20		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(11,293)			—			(37,013)			—			—			—			(48,306)
Add: Company’s share of net operating income (loss) from unconsolidated joint ventures	8,169			13,143			(259)			3,233			1,978			9,052			35,316
Company’s share of net operating income	$	167,094		$	13,143		$	123,712		$	92,111		$	11,146		$	68,712		$	475,918
% of Grand Totals	35.12		%	2.76		%	25.99		%	19.35		%	2.34		%	14.44		%	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.

36

For the three months ended September 30, 2021:

	Boston			Los Angeles			New York			San Francisco			Seattle			Washington, DC			Total
Rental Revenue: (1)
Office	$	236,080		$	—		$	257,656		$	125,340		$	—		$	85,797		$	704,873
Residential	3,418			—			—			806			—			6,670			10,894
Hotel	5,189			—			—			—			—			—			5,189
Total	244,687			—			257,656			126,146			—			92,467			720,956
% of Grand Totals	33.93		%	—		%	35.74		%	17.50		%	—		%	12.83		%	100.00		%
Rental Expenses:
Office	82,697			—			94,338			43,582			—			31,619			252,236
Residential	1,396			—			—			1,688			—			2,961			6,045
Hotel	3,946			—			—			—			—			—			3,946
Total	88,039			—			94,338			45,270			—			34,580			262,227
% of Grand Totals	33.57		%	—		%	35.98		%	17.26		%	—		%	13.19		%	100.00		%
Net operating income	$	156,648		$	—		$	163,318		$	80,876		$	—		$	57,887		$	458,729
% of Grand Totals	34.15		%	—		%	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 ventures	3,464			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 Totals	34.30		%	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.

37

Information by geographic area and property type (dollars in thousands):

For the nine months ended September 30, 2022:

	Boston			Los Angeles			New York			San Francisco			Seattle			Washington, DC			Total
Rental Revenue: (1)
Office	$	742,972		$	—		$	772,060		$	401,020		$	18,765		$	280,473		$	2,215,290
Residential	11,181			—			—			11,374			—			21,663			44,218
Hotel	28,395			—			—			—			—			—			28,395
Total	782,548			—			772,060			412,394			18,765			302,136			2,287,903
% of Grand Totals	34.20		%	—		%	33.75		%	18.02		%	0.82		%	13.21		%	100.00		%
Rental Expenses:
Office	268,781			—			291,645			135,677			4,805			101,623			802,531
Residential	4,481			—			—			9,138			—			9,655			23,274
Hotel	19,832			—			—			—			—			—			19,832
Total	293,094			—			291,645			144,815			4,805			111,278			845,637
% of Grand Totals	34.66		%	—		%	34.49		%	17.12		%	0.57		%	13.16		%	100.00		%
Net operating income	$	489,454		$	—		$	480,415		$	267,579		$	13,960		$	190,858		$	1,442,266
% of Grand Totals	33.94		%	—		%	33.31		%	18.55		%	0.97		%	13.23		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(34,405)			—			(108,818)			—			—			—			(143,223)
Add: Company’s share of net operating income (loss) from unconsolidated joint ventures	25,996			40,147			(397)			9,597			5,877			27,127			108,347
Company’s share of net operating income	$	481,045		$	40,147		$	371,200		$	277,176		$	19,837		$	217,985		$	1,407,390
% of Grand Totals	34.18		%	2.85		%	26.38		%	19.69		%	1.41		%	15.49		%	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.

38

For the nine months ended September 30, 2021:

	Boston			Los Angeles			New York			San Francisco			Seattle				Washington, DC			Total
Rental Revenue: (1)
Office	$	696,054		$	—		$	760,002		$	382,119		$	—			$	252,822		$	2,090,997
Residential	9,594			—			—			1,817			—				18,421			29,832
Hotel	7,382			—			—			—			—				—			7,382
Total	713,030			—			760,002			383,936			—				271,243			2,128,211
% of Grand Totals	33.50		%	—		%	35.71		%	18.04		%	—		%		12.75		%	100.00		%
Rental Expenses:
Office	240,743			—			286,385			124,785			—				94,360			746,273
Residential	4,286			—			—			4,918			—				8,896			18,100
Hotel	7,993			—			—			—			—				—			7,993
Total	253,022			—			286,385			129,703			—			—	103,256			772,366
% of Grand Totals	32.76		%	—		%	37.08		%	16.79		%	—		%		13.37		%	100.00		%
Net operating income	$	460,008		$	—		$	473,617		$	254,233		$	—			$	167,987		$	1,355,845
% of Grand Totals	33.93		%	—		%	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 (loss) from unconsolidated joint ventures	9,369			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 Totals	33.88		%	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.

11. Earnings Per Share / Common Unit

BXP

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 BXP and BPLP’s LTIP Units, 2012 OPP Units and MYLTIP Units are considered participating securities. Participating securities are included in the computation of basic EPS of BXP using the two-class method. Participating securities are included in the computation of diluted EPS of BXP using the if-converted method if the impact is dilutive. Because the 2012 OPP Units and 2013 - 2019 MYLTIP Units required, and the 2020 - 2022 MYLTIP Units require, BXP to outperform absolute and/or relative return thresholds, unless such thresholds have been met by the end of the applicable reporting period, BXP excludes such units from the diluted EPS calculation. Other potentially dilutive common shares, including stock options, restricted stock and other securities of BPLP that are exchangeable for BXP’s Common Stock, and the related impact on earnings, are considered when calculating diluted EPS.

39

	Three months ended September 30, 2022
	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	$	360,977	156,754	$	2.30
Allocation of undistributed earnings to participating securities	(762)		—	—
Net income attributable to Boston Properties, Inc. common shareholders	360,215		156,754	2.30
Effect of Dilutive Securities:
Stock Based Compensation	—		379	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	360,215	157,133	$	2.29
	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

	Nine months ended September 30, 2022
	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	$	727,144	156,708	$	4.64
Allocation of undistributed earnings to participating securities	(1,002)		—	(0.01)
Net income attributable to Boston Properties, Inc. common shareholders	726,142		156,708	4.63
Effect of Dilutive Securities:
Stock Based Compensation	—		436	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	726,142	157,144	$	4.62

40

	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

BPLP

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 BXP and BPLP’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 - 2019 MYLTIP Units required, and the 2020 - 2022 MYLTIP Units require, BXP to outperform absolute and/or relative return thresholds, unless such thresholds have been met by the end of the applicable reporting period, BPLP 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 17,662,000 and 17,011,000 redeemable common units for the three months ended September 30, 2022 and 2021, respectively, and 17,631,000 and 17,016,000 redeemable common units for the nine months ended September 30, 2022 and 2021, respectively.

	Three months ended September 30, 2022
	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	$	403,578	174,416	$	2.31
Allocation of undistributed earnings to participating securities	(848)		—	—
Net income attributable to Boston Properties, Inc. common shareholders	402,730		174,416	2.31
Effect of Dilutive Securities:
Stock Based Compensation	—		379	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	402,730	174,795	$	2.30

41

	Three 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	$	122,014	173,194	$	0.70
Effect of Dilutive Securities:
Stock Based Compensation	—		415	—
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	122,014	173,609	$	0.70

	Nine months ended September 30, 2022
	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	$	819,195	174,339	$	4.70
Allocation of undistributed earnings to participating securities	(1,115)		—	(0.01)
Net income attributable to Boston Properties Limited Partnership common unitholders	$	818,080	174,339	$	4.69
Effect of Dilutive Securities:
Stock Based Compensation	—		436	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	818,080	174,775	$	4.68
	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

12. Stock Option and Incentive Plan

On February 1, 2022, BXP’s Compensation Committee approved the 2022 MYLTIP awards under the Boston Properties, Inc. 2021 Stock Incentive Plan (the “2021 Plan”) to certain officers and employees of BXP. The 2022 MYLTIP awards consist of two, equally weighted (50% each) components that utilize BXP’s TSR over a three-year measurement period as the performance metric.

The first component of the 2022 MYLTIP represents one-half (50%) of the target grant-date value of the award. 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 BXP’s three-year, annualized relative TSR performance compared to a custom index of peer companies. Under this component, 100% of the target number of LTIP Units will be earned if BXP’s

42

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%) of the target grant-date value of the 2022 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 BXP’s non-annualized, cumulative absolute TSR during the three-year performance period. Under this component, 100% of the target number of LTIP Units will be earned if BXP achieves an absolute TSR equal to +1,000 basis points; if BXP’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 2022 MYLTIP, if any, will equal the sum of the number of LTIP Units earned under the first and second components and will range from zero to a maximum of 254,061 LTIP Units with a target of approximately 127,031 LTIP Units and linear interpolation between zero and maximum. Earned awards (if any) will vest 100% on January 31, 2025, 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 BXP 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 January 31, 2025, earned awards will be calculated based on TSR performance up to the date of the change of control. The 2022 MYLTIP awards are in the form of LTIP Units issued on the grant date, and they are subject to forfeiture to the extent awards are not earned. Prior to the performance measurement date holders of the 2022 MYLTIP Units are only entitled to one-tenth (10%) of the regular quarterly distributions payable on common partnership units. Following the completion of the three-year performance period, the Company will also make a “catch-up” cash payment on the 2022 MYLTIP Units that are ultimately earned in an amount equal to the regular and special distributions, if any, declared during the performance period on BXP’s Common Stock, less the distributions actually paid to holders of 2022 MYLTIP Units during the performance period on all of the awarded 2022 MYLTIP Units. Under ASC 718 “Compensation - Stock Compensation,” the 2022 MYLTIP awards have an aggregate value of approximately $17.3 million, which amount will generally be amortized into earnings under the graded vesting method.

On February 4, 2022, the measurement period for the Company’s 2019 MYLTIP awards ended and, based on BXP’s relative TSR performance, the final payout was determined to be 69.0% of target, or an aggregate of approximately $8.6 million (after giving effect to employee separations). As a result, an aggregate of 144,043 2019 MYLTIP Units that had been previously granted were automatically forfeited.

During the nine months ended September 30, 2022, BXP issued 41,818 shares of restricted common stock and BPLP issued 280,616 LTIP Units and 254,061 2022 MYLTIP Units to employees and non-employee directors under the 2021 Plan. Employees and non-employee directors paid $0.01 per share of restricted common stock and $0.25 per LTIP Unit and 2022 MYLTIP Unit. When issued, LTIP 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 of BXP and BPLP. 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 BXP’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, 2022 were valued at approximately $4.7 million ($111.47 per share weighted-average). The LTIP Units granted were valued at approximately $29.9 million (approximately $106.46 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 1.71% and an expected price volatility of 31.0%. Because the 2012 OPP Units and 2013 - 2022 MYLTIP Units are subject to both a service condition and a market condition, the Company recognizes the related compensation expense 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. 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, LTIP Units and MYLTIP Units was approximately $7.7 million and $8.4 million for the three months

43

ended September 30, 2022 and 2021, respectively, and $43.2 million and $42.2 million for the nine months ended September 30, 2022 and 2021, respectively. At September 30, 2022, there was (1) an aggregate of approximately $25.9 million of unrecognized compensation expense related to unvested restricted stock, LTIP Units and 2019 MYLTIP Units and (2) an aggregate of approximately $7.3 million of unrecognized compensation expense related to unvested 2020 - 2022 MYLTIP Units that is expected to be recognized over a weighted-average period of approximately 2.0 years.

13. Subsequent Events

On October 6, 2022, the Company entered into an agreement to sell the residential component of The Avant at Reston Town Center, located in Reston, Virginia, for a gross sale price of $141 million. The Avant is a 15-story, approximately 329,000 square foot, excluding retail space, 359-unit, luxury multifamily building. The Company will retain ownership of the approximately 26,000 square foot ground-level retail space. There can be no assurance that the Company will complete the sale on the terms currently contemplated or at all.

On October 25, 2022, the Company entered into an agreement to acquire an approximate 27% interest in the joint venture that owns 200 Fifth Avenue located in New York City, for a gross purchase price of approximately $280.2 million, which includes $120.1 million of cash and the Company’s pro rata share of the outstanding loan secured by the property of $160.1 million. The mortgage loan bears interest at 4.34% per annum and matures in November 2028. 200 Fifth Avenue is a 14-story, approximately 870,000 square-foot, LEED Gold certified, premier workplace located in the Midtown South submarket. There can be no assurance that the Company will complete the acquisition on the terms currently contemplated or at all.

44

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.

This Quarterly Report on Form 10-Q, including the documents incorporated by reference, contain 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, in each case, to the extent applicable. The forward-looking 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 forward-looking statements are based on current beliefs, expectations of future events and 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 that do not relate solely to historical matters are intended to identify forward-looking statements. These 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 expressed or implied 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.

The most significant factors that may cause actual results to differ materially from those expressed or implied by the forward-looking statements include the impact on global and U.S. economic conditions due to the ongoing COVID-19 pandemic, the ongoing war in Ukraine, continuing inflation, increasing interest rates, and supply-chain disruptions, as well as the risks described in (i) our Annual Report on Form 10-K for the fiscal year ended December 31, 2021 including those described under the caption “Risk Factors,” (ii) our Quarterly Report on Form 10-Q for the fiscal quarter ended June 30, 2022 including those described under the caption “Risk Factors,” (iii) our subsequent filings under the Exchange Act and (iv) the risk factors set forth in this Form 10-Q in Part II, Item 1A, if any.

Some of the risks and uncertainties that may cause our actual results, performance or achievements to differ materially from those expressed or implied by forward-looking statements include, among others, the following:

•the risks and uncertainties related to the impact of (1) the COVID-19 global pandemic, including the emergence of additional variants, the effectiveness, availability and distribution of vaccines, including their efficacy against new variant strains and the willingness of individuals to be vaccinated, (2) the impact of geopolitical conflicts, including the war in Ukraine, and (3) the severity and duration of the indirect economic impacts of the foregoing, such as recession, supply chain disruptions, labor market disruptions, continued inflation, increasing interest rates, dislocation and volatility in capital markets, job losses, potential longer-term changes in consumer and client behavior, as well as possible future governmental responses;

•volatile or adverse global economic and geopolitical 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;

•risks associated with downturns in the national and local economies, continued inflation, increasing interest rates, and volatility in the securities markets;

•general risks affecting the real estate industry (including, without limitation, the inability to enter into or renew leases, client space utilization, dependence on clients’ 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;

45

•risks and uncertainties affecting property development and construction (including, without limitation, continued inflation, supply chain disruptions, labor shortages, construction delays, increased construction costs, cost overruns, inability to obtain necessary permits, client accounting considerations that may result in negotiated lease provisions that limit a client’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 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 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;

•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; and

•risks associated with our dependence on key personnel whose continued service is not guaranteed.

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, particularly in light of the circumstances relating to COVID-19 and the war in Ukraine. 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 Report on Form 10-K and 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 Current 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 one of the largest publicly traded office real estate investment trusts (REITs) (based on total market capitalization as of September 30, 2022) in the United States that develops, owns, and manages primarily premier workplaces. Our properties are concentrated in six markets in the United 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. We generate revenue and cash primarily by leasing premier workplaces to our clients. When making leasing decisions, we consider, among other things, the creditworthiness of the client and the industry in which it conducts business, the length of 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 other client’s expansion rights and general economic factors.

46

Our core strategy has always been to develop, acquire and manage highest quality premier workplaces in gateway markets with high barriers-to-entry and attractive demand drivers, and to focus on executing long-term leases with financially strong clients. Our client base is diverse across market sectors and the weighted-average lease term for our in-place leases, excluding residential units, was approximately 7.8 years, as of September 30, 2022, including leases signed by our unconsolidated joint ventures. The weighted-average lease term for our 20 largest clients, based on leased square footage, was approximately 11.0 years as of September 30, 2022.

To be successful in any leasing environment, we believe we must consider all aspects of the client-landlord relationship. In this regard, we believe that our competitive leasing advantage is based on the following attributes:

•our understanding of our client’s short- and long-term space utilization and amenity needs in the local markets;

•our track record of developing and operating premier workplaces in a sustainable and responsible manner;

•our reputation as a premier developer, owner and manager of the highest quality premier workplaces in our markets;

•our financial strength and our ability to maintain high building standards; and

•our relationships with local brokers.

Outlook

Over the last quarter, inflation has remained resilient. Although the U.S. GDP returned to growth in the third quarter after two consecutive quarterly contractions, consumer spending still slowed as inflation shrank buying power. The Federal Reserve remains committed to taming the fastest rising inflation in four decades by aggressively raising interest rates and are expected to continue to do so. This evolving operating environment impacts our operating activities as:

•business leaders may generally become more reticent to make large capital allocation decisions, such as entry into a new lease, given the uncertain economic environment;

•our capital costs have increased due to higher interest rates and credit spreads, and private market debt financing, both for construction and existing assets, is significantly more challenging to arrange; and

•construction costs have increased for new development and, although the costs for our active development pipeline are, at this stage, relatively fixed, the cost of potential future developments continues to increase.

In light of the foregoing, we believe we are positioning ourself for success, notwithstanding the uncertain trajectory of the U.S. and global economy, by managing our leverage while continuing to selectively invest (including both acquisitions and developments) in premier workplace opportunities. We remain focused on the following priorities:

•continuing to embrace our leadership position in the premier workplace industry and leveraging our strength in portfolio quality, client relationships, development skills, market penetration and sustainability to profitably build market share. Premier workplaces, the preferred choice for our current and prospective clients, are gaining market share and demonstrating the highest occupancy, net absorption levels and rental rates in the central business district (“CBD”) markets where we operate;

•leasing available space in our in-service and development properties, as well as proactively focusing on future lease expirations;

•completing the construction and leasing of our development properties;

•pursuing attractive asset class adjacencies where we have a track record of success, such as life sciences and multi-family development;

•continuing to raise the bar in the quality of our portfolio and actively recycle capital by selling assets, subject to market condition;

•actively managing our operations in a sustainable and responsible manner; and

•prioritizing risk management by actively managing liquidity, investing more extensively with joint venture partners to manage our debt levels, and being highly selective in new investment commitments.

47

The following is an overview of leasing and investment activity in the third quarter of 2022.

Leasing Activity and Occupancy

In the third quarter of 2022, we signed approximately 1.4 million square feet of new leases and renewals, our strongest third quarter leasing volume since 2019. These leases have a weighted-average lease term of approximately 9.8 years, indicating that many new and existing clients continue to commit to the long-term use of space and view our properties as their preferred choice for a premier workplace environment.

The overall occupancy of our in-service office and retail properties was 88.9% at September 30, 2022, a decrease of 60 basis points from June 30, 2022. We experienced a slight decline in occupancy as we wait for recently signed leases to commence. We also removed three assets from our in-service portfolio: 601 Massachusetts Avenue, which was approximately 98% leased prior to its sale, 140 Kendrick Street Building A, which is now under redevelopment and 100% pre-leased, and 760 Boylston Street which is in redevelopment and 100% pre-leased.

The macroeconomic environment has resulted in softening demand in all of our markets. While tours continue and leases under negotiation move forward, there is less urgency from clients to make new commitments. Potential clients touring space acknowledge that economic uncertainty is impacting space decisions. As we consider our expectations for leasing in 2023, we are factoring in the impacts of a slower economy, softer business performance, and reduced demand for space. We expect the bulk of our leasing will continue to come from small and medium-sized professional and financial services firms.

Investment Activity

We remain committed to developing and acquiring assets to enhance our long-term growth and to meet client demand for high-quality office, residential, and life sciences 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 workplaces in each of our chosen markets.

Consistent with this strategy, in September 2022, we further expanded our life sciences portfolio in Kendall Square in Cambridge, Massachusetts by completing the acquisition of 125 Broadway for a purchase price, including transaction costs, of approximately $592.4 million. 125 Broadway is a six-story, 271,000 square foot laboratory/life sciences property adjacent to our existing 2.2 million square foot portfolio in the heart of Kendall Square. Kendall Square is considered to be among the largest and most important cluster of life sciences companies and research space in the United States. This property is 100% leased.

In October of 2022, we entered into an agreement to acquire an approximate 27% interest in the joint venture that owns 200 Fifth Avenue, a 14-story, approximately 870,000 square-foot, LEED Gold certified, premier workplace located in New York City that is approximately 93% leased. The acquisition of the joint venture interest will be our second investment in the vibrant Midtown South neighborhood in the past twelve months. We will serve as the managing member and provide customary leasing and property management services for the joint venture. We expect to close the acquisition in the fourth quarter of 2022 for a gross purchase price of approximately $280.2 million, which includes $120.1 million of cash and our pro rata share of the outstanding loan secured by the property of $160.1 million. The mortgage loan bears interest at 4.34% per annum and matures in November 2028. There can be no assurance that we will complete the acquisition on the terms currently contemplated or at all.

As of September 30, 2022, our development/redevelopment pipeline consists of 14 properties that, when completed, we expect will total approximately 4.4 million square feet. Our share of the estimated total cost for these projects is approximately $2.7 billion, of which approximately $948.2 million remained to be invested. The total development pipeline, inclusive of both office and laboratory/life sciences developments, but excluding the View Boston Observatory at the Prudential Center and Reston Next Residential, is 52% pre-leased.

As we continue to focus on new investments to drive future growth, we regularly review our portfolio to identify properties as potential sales candidates that either no longer fit within our portfolio strategy or could attract premium pricing in the current market. In the third quarter of 2022, we completed the disposition of:

•601 Massachusetts Avenue located in Washington, DC for a gross sale price of $531.0 million. Net cash proceeds totaled approximately $512.3 million resulting in a gain on sale of real estate totaling approximately $237.4 million for BXP and $237.5 million for BPLP. 601 Massachusetts Avenue is an 11-

48

story, approximately 479,000 square foot premier workplace originally developed by us in 2013. We will continue to provide property management services to the new owner.

•Land parcels located in Loudoun County, Virginia for a gross sale price of $27.0 million. Net cash proceeds totaled approximately $25.6 million resulting in a gain on sale of real estate totaling approximately $24.4 million.

In October of 2022, we entered into an agreement to sell the residential component of The Avant at Reston Town Center located in Reston, Virginia. The Avant is a 15-story, approximately 329,000 square foot, excluding retail space, 359-unit, luxury multifamily building that was 95% occupied, as of September 30, 2022. We will retain ownership of the approximately 26,000 square foot ground-level retail space. We expect to complete the transaction in the fourth quarter of 2022 for a gross sale price of $141 million. There can be no assurance that we will complete the sale on the terms currently contemplated or at all.

We do not anticipate any further dispositions in 2022. Assuming the completion of the sale of The Avant, our total dispositions in 2022 is projected to be approximately $864 million.

A brief overview of each of our markets follows.

Boston

During the third quarter of 2022, we signed approximately 800,000 square feet of leases and approximately 238,000 square feet of leases commenced in the Boston region. Approximately 180,000 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 28% over the prior leases.

Our Boston CBD in-service portfolio was approximately 95% leased as of September 30, 2022.

Our approximately 2.7 million square foot in-service office portfolio in Cambridge was approximately 96% leased as of September 30, 2022. We and Biogen Inc. terminated Biogen’s lease at 300 Binney Street in Kendall Square to facilitate the conversion and expansion of the property, which is expected to begin in early 2023. Biogen will be vacating the property in phases through early 2023. 300 Binney Street is currently an approximately 195,000 net rentable square foot property that will be redeveloped into an approximately 240,000 net rentable square foot laboratory/life sciences space for The Broad Institute who has signed a lease for 100% of the laboratory/life sciences space. There can be no assurance that we will commence the redevelopment on the terms and schedule currently contemplated or at all.

Our Route 128-Mass Turnpike portfolio is comprised of approximately 4.7 million square feet and was approximately 83% leased as of September 30, 2022. We partially placed in-service 880 Winter Street, an approximately 244,000 square foot laboratory/life sciences project located in Waltham, Massachusetts. The project is 97% pre-leased, as of November 1, 2022.

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, an approximately 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, 2022, our LA in-service properties were approximately 90% leased.

New York

During the third quarter of 2022, we executed approximately 290,000 square feet of leases in the New York region and approximately 704,000 square feet of leases commenced. Approximately 578,000 square feet of the leases that commenced in the third quarter had been vacant for less than one year and they represent a decrease in net rental obligations of approximately 4% over the prior leases. As of September 30, 2022, our New York CBD in-service portfolio was approximately 89% leased.

San Francisco

During the third quarter of 2022, we executed approximately 165,000 square feet of leases and approximately 271,000 square feet of leases commenced in the San Francisco region. Approximately 169,000 square feet of leases that commenced had been vacant for less than one year and represent an increase in net rental obligations of approximately 3% over the prior leases.

49

Our San Francisco CBD in-service properties were approximately 89% leased as of September 30, 2022.

Seattle

Our Seattle in-service portfolio includes Safeco Plaza, an approximately 778,000 square foot property of which we own 33.67%, and Madison Centre, an approximately 755,000 square foot property. As of September 30, 2022, our Seattle in-service properties were approximately 89% leased.

Washington, DC

During the third quarter of 2022, we executed approximately 163,000 square feet of leases and approximately 526,000 square feet of leases commenced in the Washington, DC region. Approximately 455,000 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 9% over the prior leases. Our Washington, DC CBD in-service properties were approximately 84% leased as of September 30, 2022.

A significant component of our Washington DC regional portfolio is in Reston Town Center, an award-winning mixed-use development in Northern Virginia. Reston is a hub for technology, cloud services, cybersecurity and defense intelligence companies. Our Reston, Virginia properties were approximately 92% leased as of September 30, 2022.

Leasing Statistics

The table below details the leasing activity, including 100% of the unconsolidated joint ventures, that commenced during the three and nine months ended September 30, 2022:

	Three months ended September 30, 2022		Nine months ended September 30, 2022
	(Square Feet)
Vacant space available at the beginning of the period	5,019,936		5,340,029
Property dispositions/properties taken out of service (1)	(123,177)		(403,655)
Vacant space in properties acquired (2)	—		77,581
Properties placed (and partially placed) in-service (3)	62,933		894,176
Leases expiring or terminated during the period	2,038,565		5,055,329
Total space available for lease	6,998,257		10,963,460
1st generation leases	67,007		1,042,887
2nd generation leases with new clients	595,133		2,170,648
2nd generation lease renewals	1,085,208		2,499,016
Total space leased (4)	1,747,348		5,712,551
Vacant space available for lease at the end of the period	5,250,909		5,250,909
Leases executed during the period, in square feet (5)	1,446,284		4,558,755
Second generation leasing information: (6)
Leases commencing during the period, in square feet	1,680,341		4,669,664
Weighted Average Lease Term	114 Months		103 Months
Weighted Average Free Rent Period	77 Days		97 Days
Total Transaction Costs Per Square Foot (7)	$116.42		$84.02
Increase in Gross Rents (8)	1.41	%	3.93	%
Increase in Net Rents (9)	0.21	%	5.15	%

 __________________

(1)Total vacant square feet of properties taken out of service and property disposition during the three months ended September 30, 2022 consists of 117,907 square feet at 760 Boylston Street and 5,270 square feet at 601 Massachusetts Avenue. Total vacant square feet of properties taken out of service and property dispositions during the nine months ended September 30, 2022 consists of 117,907 square feet at 760

50

Boylston Street, 95,180 square feet at 651 Gateway, 185,298 square feet at Virginia 95 Office Park and 5,270 square feet at 601 Massachusetts Avenue.

(2)Total vacant square feet of properties acquired during the nine months ended September 30, 2022 consists of 77,581 square feet at Madison Centre.

(3)Total vacant square feet of properties placed (and partially placed) in-service during the three months ended September 30, 2022 consists of 4,207 square feet at 2100 Pennsylvania Avenue, 7,531 square feet at Reston Next and 51,195 square feet at 880 Winter Street. Total square feet of properties placed (and partially placed) in-service during the nine months ended September 30, 2022 consists of 51,195 square feet at 880 Winter Street, 418,221 square feet at Reston Next, 10,752 square feet at 2100 Pennsylvania Avenue and 414,008 square feet at 325 Main Street.

(4)Represents leases for which lease revenue recognition has commenced in accordance with GAAP during the three and nine months ended September 30, 2022.

(5)Represents leases executed during the three and nine months ended September 30, 2022 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 during the three and nine months ended September 30, 2022 is 193,318 and 758,239 square feet, respectively.

(6)Second generation leases are defined as leases for space that had previously been leased by us. Of the 1,680,341 and 4,669,664 square feet of second generation leases that commenced during the three and nine months ended September 30, 2022, respectively, leases for 1,498,628 and 3,923,030 square feet, respectively, were signed in prior periods.

(7)Total transaction costs include tenant improvements and leasing commissions but exclude free rent concessions and other inducements in accordance with GAAP.

(8)Represents the increase in gross rent (base rent plus expense reimbursements) on the new versus expired leases on the 1,382,469 and 3,681,677 square feet of second generation leases that had been occupied within the prior 12 months for the three and nine months ended September 30, 2022, respectively; excludes leases that management considers temporary because the client is not expected to occupy the space on a long-term basis.

(9)Represents the increase in net rent (gross rent less operating expenses) on the new versus expired leases on the 1,382,469 and 3,681,677 square feet of second generation leases that had been occupied within the prior 12 months for the three and nine months ended September 30, 2022, respectively.

Transactions during the three months ended September 30, 2022 included the following:

Acquisition activity

•On September 16, 2022, we acquired 125 Broadway in Cambridge, Massachusetts for a net purchase price, including transaction costs, of approximately $592.4 million. The acquisition was completed with available cash and borrowings under BPLP’s unsecured credit facility. 125 Broadway is a 271,000 net rentable square foot, six-story, laboratory/life sciences property. The property is 100% leased.

Disposition activities

•On August 30, 2022, we completed the sale of 601 Massachusetts Avenue located in Washington, DC for a gross sale price of $531.0 million. Net cash proceeds totaled approximately $512.3 million, resulting in a gain on sale of real estate of approximately $237.4 million for BXP and approximately $237.5 million for BPLP. 601 Massachusetts Avenue is an approximately 479,000 net rentable square foot premier workplace.

•On September 15, 2022, we completed the sale of two parcels of land located in Loudoun County, Virginia for an aggregate gross sale price of $27.0 million. Net cash proceeds totaled approximately $25.6 million, resulting in a gain on sale of real estate totaling approximately $24.4 million for BXP and BPLP.

Development activities

•On July 1, 2022, we commenced the redevelopment of 140 Kendrick Street, a premier workplace that consists of three buildings aggregating approximately 388,000 net rentable square feet located in Needham, Massachusetts. The redevelopment is a repositioning of one building consisting of approximately 90,000 net rentable square feet into a net zero, carbon neutral premier workplace building, as defined by the LEED Zero Carbon Certification. When completed, the building will consist of approximately 104,000 net rentable square feet. This project is 100% pre-leased.

51

•On July 15, 2022, we partially placed in-service 880 Winter Street, an approximately 244,000 net rentable square foot laboratory/life sciences project located in Waltham, Massachusetts. This project is 97% pre-leased.

•On September 8, 2022, we terminated our existing lease agreement with our client at 300 Binney Street to facilitate the conversion and expansion of the property. 300 Binney Street is a premier workplace with approximately 195,000 net rentable square feet at Kendall Center in Cambridge, Massachusetts that will be redeveloped into approximately 240,000 net rentable square feet of laboratory/life sciences space. The commencement of construction is subject to various conditions. There can be no assurance that we will commence the redevelopment on the terms and schedule currently contemplated or at all. This property is 100% pre-leased to a single client.

•On September 12, 2022, we commenced the redevelopment of 760 Boylston Street, a retail project at the Prudential Center located in Boston, Massachusetts. The redevelopment is a modernization of the space consisting of approximately 118,000 net rentable square feet. This project is 100% pre-leased to a single client.

Unconsolidated joint venture activities

•On August 8, 2022, a joint venture in which we have a 50% interest modified the construction loan collateralized by its Dock 72 property located in Brooklyn, New York. At the time of the modification, the loan had an outstanding balance totaling approximately $198.4 million, a total commitment amount of $250.0 million, bore interest at a variable rate equal to LIBOR plus 3.35% per annum, and was scheduled to mature on December 18, 2023. The modified construction loan bears interest at a variable rate equal to (1) the greater of (x) SOFR or (y) 0.25% plus (2) 3.10% per annum, has a total commitment amount of approximately $198.4 million, and continues to mature on December 18, 2023. Dock 72 is a premier workplace with approximately 669,000 net rentable square feet.

•On September 1, 2022, a joint venture in which we have a 20% interest entered into an interest rate cap agreement to cap the variable rate debt secured by its Metropolitan Square property located in Washington, DC. The mortgage and mezzanine loans have an aggregate principal balance of $420.0 million and bear interest at a weighted average variable rate equal to SOFR plus 2.75% per annum. The interest rate cap agreement capped SOFR at 4.50% per annum on a notional amount of $420.0 million through April 15, 2024. Metropolitan Square is a premier workplace with approximately 657,000 net rentable square feet located in Washington, DC.

•On September 9, 2022, a joint venture in which we have an approximate 33.67% interest modified the mortgage loan collateralized by its Safeco Plaza property located in Seattle, Washington. At the time of the modification, the loan’s outstanding balance totaled $250.0 million, bore interest at a variable rate equal to the greater of (x) 2.35% or (y) LIBOR plus 2.20% per annum, and was scheduled to mature on September 1, 2026. The modified mortgage loan bears interest at a variable rate equal to the greater of (x) 2.35% or (y) SOFR plus 2.32% per annum and continues to mature on September 1, 2026. In conjunction with the loan modification, the joint venture entered into an interest rate cap agreement that capped SOFR at 2.50% per annum on a notional amount of $250.0 million through September 1, 2023. Safeco Plaza is a premier workplace with approximately 765,000 net rentable square feet.

Transactions completed subsequent to September 30, 2022 included the following:

•On October 6, 2022, we entered into an agreement to sell the residential component of The Avant at Reston Town Center, located in Reston, Virginia, for a gross sale price of $141 million. The Avant is a 15-story, approximately 329,000 square foot, excluding retail space, 359-unit, luxury multifamily building. We will retain ownership of the approximately 26,000 square foot ground-level retail space. There can be no assurance that we will complete the sale on the terms currently contemplated or at all.

•On October 25, 2022, we entered into an agreement to acquire an approximate 27% interest in the joint venture that owns 200 Fifth Avenue located in New York City, for a gross purchase price of approximately $280.2 million, which includes $120.1 million of cash and our pro rata share of the outstanding loan secured by the property of $160.1 million. The mortgage loan bears interest at 4.34% per annum and matures in November 2028. 200 Fifth Avenue is a 14-story, approximately 870,000 square-foot, LEED Gold certified, premier workplace located in the Midtown South submarket. There can be no assurance that we will complete the acquisition on the terms currently contemplated or at all.

52

Critical Accounting Estimates

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. Actual results may differ from those estimates and assumptions.

Our Annual Report on Form 10-K for the year ended December 31, 2021 contains a discussion of our critical accounting estimates. There have been no significant changes in our critical accounting estimates since the year ended December 31, 2021.

Results of Operations for the Nine Months Ended September 30, 2022 and 2021

Net income attributable to Boston Properties, Inc. common shareholders and net income attributable to Boston Properties Limited Partnership common unitholders increased by approximately $415.5 million and $465.6 million for the nine months ended September 30, 2022 compared to 2021, respectively, as set forth in the following tables and for the reasons discussed below under the heading “Comparison of the nine months ended September 30, 2022 to the nine months ended September 30, 2021” within “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

The following are reconciliations of Net Income Attributable to Boston Properties, Inc. Common Shareholders to Net Operating Income and Net Income Attributable to Boston Properties Limited Partnership Common Unitholders to Net Operating Income for the nine months ended September 30, 2022 and 2021. For a detailed discussion of Net Operating Income (“NOI”), including the reasons management believes NOI is useful to investors, see page 56.

53

BXP

	Nine months ended September 30,
	2022		2021		Increase/ (Decrease)		% Change
	(in thousands)
Net Income Attributable to Boston Properties, Inc. Common Shareholders	$	727,144	$	311,680	$	415,464	133.30	%
Preferred stock redemption charge	—		6,412		(6,412)		(100.00)	%
Preferred dividends	—		2,560		(2,560)		(100.00)	%
Net Income Attributable to Boston Properties, Inc.	727,144		320,652		406,492		126.77	%
Net Income Attributable to Noncontrolling Interests:
Noncontrolling interest—common units of the Operating Partnership	82,821		35,393		47,428		134.00	%
Noncontrolling interests in property partnerships	54,896		52,602		2,294		4.36	%
Net Income	864,861		408,647		456,214		111.64	%
Other Expenses:
Add:
Interest expense	317,216		320,015		(2,799)		(0.87)	%
Losses from early extinguishment of debt	—		898		(898)		(100.00)	%
Loss from unconsolidated joint ventures	1,389		1,745		(356)		(20.40)	%
Other Income:
Less:
Gains (losses) from investments in securities	(8,549)		3,744		(12,293)		(328.34)	%
Other income - assignment fee	6,624		—		6,624		100.00	%
Interest and other income (loss)	6,151		4,140		2,011		48.57	%
Gains on sales of real estate	381,293		8,104		373,189		4,605.00	%
Other Expenses:
Add:
Depreciation and amortization expense	551,445		539,815		11,630		2.15	%
Transaction costs	2,146		2,970		(824)		(27.74)	%
Payroll and related costs from management services contracts	11,204		9,166		2,038		22.23	%
General and administrative expense	110,378		117,924		(7,546)		(6.40)	%
Other Revenue:
Less:
Direct reimbursements of payroll and related costs from management services contracts	11,204		9,166		2,038		22.23	%
Development and management services revenue	19,650		20,181		(531)		(2.63)	%
Net Operating Income	$	1,442,266	$	1,355,845	$	86,421	6.37	%

54

BPLP

	Nine months ended September 30,
	2022		2021		Increase/ (Decrease)		% Change
	(in thousands)
Net Income Attributable to Boston Properties Limited Partnership Common Unitholders	$	819,195	$	353,633	$	465,562	131.65	%
Preferred unit redemption charge	—		6,412		(6,412)		(100.00)	%
Preferred distributions	—		2,560		(2,560)		(100.00)	%
Net Income Attributable to Boston Properties Limited Partnership	819,195		362,605		456,590		125.92	%
Net Income Attributable to Noncontrolling Interests:
Noncontrolling interests in property partnerships	54,896		52,602		2,294		4.36	%
Net Income	874,091		415,207		458,884		110.52	%
Other Expenses:
Add:
Interest expense	317,216		320,015		(2,799)		(0.87)	%
Losses from early extinguishment of debt	—		898		(898)		(100.00)	%
Loss from unconsolidated joint ventures	1,389		1,745		(356)		(20.40)	%
Other Income:
Less:
Gains (losses) from investments in securities	(8,549)		3,744		(12,293)		(328.34)	%
Other income - assignment fee	6,624		—		6,624		100.00	%
Interest and other income (loss)	6,151		4,140		2,011		48.57	%
Gains on sales of real estate	385,349		8,104		377,245		4,655.05	%
Other Expenses:
Add:
Depreciation and amortization expense	546,271		533,255		13,016		2.44	%
Transaction costs	2,146		2,970		(824)		(27.74)	%
Payroll and related costs from management services contracts	11,204		9,166		2,038		22.23	%
General and administrative expense	110,378		117,924		(7,546)		(6.40)	%
Other Revenue:
Less:
Direct reimbursements of payroll and related costs from management services contracts	11,204		9,166		2,038		22.23	%
Development and management services revenue	19,650		20,181		(531)		(2.63)	%
Net Operating Income	$	1,442,266	$	1,355,845	$	86,421	6.37	%

At September 30, 2022 and 2021, we owned or had joint venture interests in a portfolio of 193 and 202 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 provides a complete understanding of our operating results. Therefore, the comparison of operating results for the three and nine months ended September 30, 2022 and 2021 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, Development or Redevelopment or 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 or

55

in development or redevelopment after the beginning of the earliest period presented or disposed of prior to the end of the latest period presented.

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, other income - assignment fee, interest and other income (loss), gains on sales of real estate, direct reimbursements of payroll and related costs from management 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 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 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 understand 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 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 gains on sales of real estate and depreciation expense 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, 2022 to the nine months ended September 30, 2021

The table below shows selected operating information for the Same Property Portfolio and the Total Property Portfolio. The Same Property Portfolio consists of 126 properties totaling approximately 38.2 million net rentable square feet, excluding unconsolidated joint ventures. The Same Property Portfolio includes properties acquired or placed in-service on or prior to January 1, 2021 and owned and in service through September 30, 2022. The Total Property Portfolio includes the effects of the other properties either acquired, placed in-service, in development or redevelopment after January 1, 2021 or disposed of on or prior to September 30, 2022. 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, 2022 and 2021 with respect to the properties that were acquired, placed in-service, in development or redevelopment or sold.

56

	Same Property Portfolio								Properties Acquired Portfolio				Properties Placed In-Service Portfolio				Properties in Development or Redevelopment Portfolio				Properties Sold Portfolio				Total Property Portfolio
	2022		2021		Increase/ (Decrease)		% Change		2022		2021		2022		2021		2022		2021		2022		2021		2022		2021		Increase/ (Decrease)		% Change
	(dollars in thousands)
Rental Revenue: (1)
Lease Revenue (Excluding Termination Income)	$	2,007,651	$	1,939,988	$	67,663	3.49	%	$	28,430	$	3,596	$	61,026	$	17,962	$	2,876	$	5,043	$	33,357	$	54,805	$	2,133,340	$	2,021,394	$	111,946	5.54	%
Termination Income	5,579		11,499		(5,920)		(51.48)	%	402		—		—		—		—		—		—		—		5,981		11,499		(5,518)		(47.99)	%
Lease Revenue	2,013,230		1,951,487		61,743		3.16	%	28,832		3,596		61,026		17,962		2,876		5,043		33,357		54,805		2,139,321		2,032,893		106,428		5.24	%
Parking and Other	73,672		57,067		16,605		29.10	%	1,461		—		29		14		—		201		807		822		75,969		58,104		17,865		30.75	%
Total Rental Revenue (1)	2,086,902		2,008,554		78,348		3.90	%	30,293		3,596		61,055		17,976		2,876		5,244		34,164		55,627		2,215,290		2,090,997		124,293		5.94	%
Real Estate Operating Expenses	767,517		720,559		46,958		6.52	%	7,214		653		15,673		6,001		1,599		2,182		10,528		16,878		802,531		746,273		56,258		7.54	%
Net Operating Income, Excluding Residential and Hotel	1,319,385		1,287,995		31,390		2.44	%	23,079		2,943		45,382		11,975		1,277		3,062		23,636		38,749		1,412,759		1,344,724		68,035		5.06	%
Residential Net Operating Income (2)	20,944		11,732		9,212		78.52	%	—		—		—		—		—		—		—		—		20,944		11,732		9,212		78.52	%
Hotel Net Operating Income (Loss) (2)	8,563		(611)		9,174		1,501.47	%	—		—		—		—		—		—		—		—		8,563		(611)		9,174		1,501.47	%
Net Operating Income	$	1,348,892	$	1,299,116	$	49,776	3.83	%	$	23,079	$	2,943	$	45,382	$	11,975	$	1,277	$	3,062	$	23,636	$	38,749	$	1,442,266	$	1,355,845	$	86,421	6.37	%

_______________

(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 56. Residential Net Operating Income for the nine months ended September 30, 2022 and 2021 is comprised of Residential Revenue of $44,218 and $29,832 less Residential Expenses of $23,274 and $18,100, respectively. Hotel Net Operating Income (Loss) for the nine months ended September 30, 2022 and 2021 is comprised of Hotel Revenue of $28,395 and $7,382 less Hotel Expenses of $19,832 and $7,993, respectively, per the Consolidated Statements of Operations.

57

Same Property Portfolio

Lease Revenue (Excluding Termination Income)

Lease revenue (excluding termination income) from the Same Property Portfolio increased by approximately $67.7 million for the nine months ended September 30, 2022 compared to 2021. The increase was a result of our average revenue per square foot increasing by approximately $2.95, contributing approximately $74.6 million, partially offset by average occupancy decreasing from 91.6% to 91.2%, resulting in a decrease of approximately $6.9 million.

Termination Income

Termination income decreased by approximately $5.9 million for the nine months ended September 30, 2022 compared to 2021.

Termination income for the nine months ended September 30, 2022 related to 23 clients across the Same Property Portfolio and totaled approximately $5.0 million, which was primarily related to clients that terminated leases early in New York City. In addition, we received a distribution from our unsecured credit claim against Lehman Brothers, Inc. of approximately $0.6 million.

Termination income for the nine months ended September 30, 2021 related to 23 clients across the Same Property Portfolio and totaled approximately $11.5 million, which was primarily related to clients that terminated leases early in New York City and the Boston region.

Parking and Other Revenue

Parking and other revenue increased by approximately $16.6 million for the nine months ended September 30, 2022 compared to 2021. Parking revenue increased by approximately $17.3 million and was partially offset by a decrease in other revenue of approximately $0.7 million. The increase in parking revenue was primarily due to an increase in transient and monthly parking.

Real Estate Operating Expenses

Real estate operating expenses from the Same Property Portfolio increased by approximately $47.0 million, or 6.5%, for the nine months ended September 30, 2022 compared to 2021, due primarily to an increase in operating expenses, including cleaning, utilities, repairs and maintenance, and roads/grounds/security. The increase in operating expenses was driven by an increase in physical occupancy.

Properties Acquired Portfolio

The table below lists the properties acquired between January 1, 2021 and September 30, 2022. Rental revenue and real estate operating expenses increased by approximately $26.7 million and $6.6 million, respectively, for the nine months ended September 30, 2022 compared to 2021, as detailed below.

		Square Feet	Rental Revenue						Real Estate Operating Expenses
Name	Date acquired		2022		2021		Change		2022		2021		Change
			(dollars in thousands)
153 & 211 Second Avenue	June 2, 2021	136,882	$	7,669	$	3,101	$	4,568	$	840	$	319	$	521
Shady Grove Innovation District	August 2, 2021	232,278	2,237		495		1,742		1,361		334		1,027
Madison Centre (1)	May 17, 2022	754,988	18,765		—		18,765		4,805		—		4,805
125 Broadway	September 16, 2022	271,000	1,622		—		1,622		208		—		208
		1,395,148	$	30,293	$	3,596	$	26,697	$	7,214	$	653	$	6,561

______________

(1)Rental revenue for the nine months ended September 30, 2022 includes approximately $0.4 million of termination income.

58

Properties Placed In-Service Portfolio

The table below lists the properties that were placed in-service or partially placed in-service between January 1, 2021 and September 30, 2022. Rental revenue and real estate operating expenses from our Properties Placed In-Service Portfolio increased by approximately $43.1 million and $9.7 million, respectively, for the nine months ended September 30, 2022 compared to 2021, as detailed below.

	Quarter Initially Placed In-Service	Quarter Fully Placed In-Service		Rental Revenue						Real Estate Operating Expenses
Name			Square Feet	2022		2021		Change		2022		2021		Change
				(dollars in thousands)
One Five Nine East 53rd Street (1)	First Quarter, 2021	First Quarter, 2021	220,000	$	13,356	$	10,600	$	2,756	$	2,078	$	2,046	$	32
200 West Street (2)	Fourth Quarter, 2020	Fourth Quarter, 2021	273,365	12,522		4,900		7,622		4,223		2,168		2,055
Reston Next	Fourth Quarter, 2021	N/A	1,062,000	24,029		—		24,029		7,861		—		7,861
325 Main Street (3)	Second Quarter, 2022	Second Quarter, 2022	414,008	10,295		—		10,295		830		278		552
2100 Pennsylvania Avenue	Second Quarter, 2022	N/A	480,000	169		—		169		305		—		305
880 Winter Street (4)	Third Quarter, 2022	N/A	244,000	684		2,476		(1,792)		376		1,509		(1,133)
			2,693,373	$	61,055	$	17,976	$	43,079	$	15,673	$	6,001	$	9,672

_____________

(1)This is the low-rise portion of 601 Lexington Avenue.

(2)Includes 138,444 square feet of redevelopment that was fully placed in-service in December 2021.

(3)Real estate operating expenses for the nine months ended September 30, 2021 were related to demolition costs.

(4)Conversion of a 224,000 square foot office property located in Waltham, Massachusetts to laboratory space.

Properties in Development or Redevelopment Portfolio

The table below lists the properties that were in development or redevelopment between January 1, 2021 and September 30, 2022. Rental revenue and real estate operating expenses from our Properties in Development or Redevelopment Portfolio decreased by approximately $2.4 million and $0.6 million, respectively, for the nine months ended September 30, 2022 compared to 2021, as detailed below.

			Rental Revenue						Real Estate Operating Expenses
Name	Date Commenced Development / Redevelopment	Square Feet	2022		2021		Change		2022		2021		Change
			(dollars in thousands)
3625-3635 Peterson Way (1)	April 16, 2021	218,000	$	—	$	1,753	$	(1,753)	$	—	$	459	$	(459)
140 Kendrick - Building A	July 1, 2022	104,000	2,876		3,244		(368)		991		889		102
760 Boylston Street	September 12, 2022	118,000	—		247		(247)		608		834		(226)
		440,000	$	2,876	$	5,244	$	(2,368)	$	1,599	$	2,182	$	(583)

_____________

(1)On April 16, 2021, we removed 3625-3635 Peterson Way, located in Santa Clara, California, from our in-service portfolio. We demolished the building and expect to redevelop the site at a future date.

59

Properties Sold Portfolio

The table below lists the properties we sold between January 1, 2021 and September 30, 2022. Rental revenue and real estate operating expenses from our Properties Sold Portfolio decreased by approximately $21.5 million and $6.4 million, respectively, for the nine months ended September 30, 2022 compared to 2021, as detailed below.

				Rental Revenue						Real Estate Operating Expenses
Name	Date Sold	Property Type	Square Feet	2022		2021		Change		2022		2021		Change
				(dollars in thousands)
181, 191 and 201 Spring Street	October 25, 2021	Office	333,000	$	—	$	11,588	$	(11,588)	$	—	$	3,545	$	(3,545)
195 West Street	March 31, 2022	Office	63,500	749		849		(100)		242		466		(224)
Virginia 95 Office Park	June 15, 2022	Office/Flex	733,421	5,190		11,091		(5,901)		1,787		2,990		(1,203)
601 Massachusetts Avenue	August 30, 2022	Office	478,667	28,225		32,099		(3,874)		8,499		9,877		(1,378)
			1,608,588	$	34,164	$	55,627	$	(21,463)	$	10,528	$	16,878	$	(6,350)

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 increased by approximately $9.2 million for the nine months ended September 30, 2022 compared to 2021.

The following reflects our occupancy and rate information for our residential same properties for the nine months ended September 30, 2022 and 2021.

	Average Monthly Rental Rate (1)						Average Rental Rate Per Occupied Square Foot						Average Physical Occupancy (2)						Average Economic Occupancy (3)
Name	2022		2021		Change (%)		2022		2021		Change (%)		2022		2021		Change (%)		2022		2021		Change (%)
Proto Kendall Square	$	2,804	$	2,577	8.8	%	$	5.16	$	4.73	9.1	%	94.8	%	92.2	%	2.8	%	94.1	%	91.0	%	3.4	%
The Lofts at Atlantic Wharf	$	4,089	$	3,459	18.2	%	$	4.55	$	3.89	17.0	%	97.8	%	93.4	%	4.7	%	97.3	%	91.0	%	6.9	%
The Avant at Reston Town Center (4)	$	2,400	$	2,225	7.9	%	$	2.61	$	2.46	6.1	%	95.2	%	94.2	%	1.1	%	95.3	%	93.6	%	1.8	%
Signature at Reston	$	2,644	$	2,279	16.0	%	$	2.73	$	2.36	15.7	%	95.2	%	86.8	%	9.7	%	94.7	%	83.6	%	13.3	%
The Skylyne	$	3,378	$	3,147	7.3	%	$	4.15	$	3.75	10.7	%	82.7	%	30.2	%	173.8	%	80.2	%	22.7	%	253.3	%

_____________  

(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.

(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.

(4)See Note 13 to the Consolidated Financial Statements.

60

Hotel Net Operating Income (Loss)

The Boston Marriott Cambridge hotel had net operating income of approximately $8.6 million for the nine months ended September 30, 2022, representing an increase of approximately $9.2 million compared to the nine months ended September 30, 2021.

The following reflects our occupancy and rate information for the Boston Marriott Cambridge hotel for the nine months ended September 30, 2022 and 2021.

	2022			2021			Change (%)
Occupancy	63.4		%	27.8		%	128.1	%
Average daily rate	$	315.24		$	192.67		63.6	%
REVPAR	$	199.83		$	53.59		272.9	%

Other Operating Revenue and Expense Items

Development and Management Services Revenue

Development and management services revenue decreased by approximately $0.5 million for the nine months ended September 30, 2022 compared to 2021. Development services revenue decreased by approximately $1.7 million and management services revenue increased by approximately $1.2 million. The decrease in development services revenue was primarily related to a decrease in development fees earned from unconsolidated joint venture properties in the Washington, DC and Boston regions, which were placed in-service during prior periods. The increase in management services revenue was primarily related to an increase in property management fees from an unconsolidated joint venture in the Boston region and asset management fees from an unconsolidated joint venture in the Seattle region.

General and Administrative Expense

General and administrative expense decreased by approximately $7.5 million for the nine months ended September 30, 2022 compared to 2021 primarily due to a decrease in compensation expense of approximately $13.2 million, partially offset by an approximately $5.7 million increase in other general and administrative expenses. The decrease in compensation expense related to an approximately $12.2 million decrease in the value of our deferred compensation plan and an approximately $1.0 million decrease in other compensation expenses. The increase in other general and administrative expenses was primarily related to an increase in professional fees.

Wages directly related to the development of rental properties are capitalized and included in real estate assets 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, 2022 and 2021 were approximately $12.0 million and $10.1 million, respectively. These costs are not included in the general and administrative expenses discussed above.

Transaction Costs

Transaction costs decreased by approximately $0.8 million for the nine months ended September 30, 2022 compared to 2021 due primarily to costs incurred in connection with the pursuit and formation of new joint ventures in 2021 that did not occur at the same levels in 2022. In general, transaction costs relating to the formation of new 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.

61

BXP

Depreciation and amortization expense increased by approximately $11.6 million for the nine months ended September 30, 2022 compared to 2021, as detailed below.

Portfolio	Depreciation and Amortization for the nine months ended September 30,
	2022		2021		Change
	(in thousands)
Same Property Portfolio (1)	$	493,588	$	498,760	$	(5,172)
Properties Acquired Portfolio	25,735		4,735		21,000
Properties Placed In-Service Portfolio (2)	22,655		24,050		(1,395)
Properties in Development or Redevelopment Portfolio	3,329		1,826		1,503
Properties Sold Portfolio	6,138		10,444		(4,306)
	$	551,445	$	539,815	$	11,630

_____________

(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.

(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.

BPLP

Depreciation and amortization expense increased by approximately $13.0 million for the nine months ended September 30, 2022 compared to 2021, as detailed below.

Portfolio	Depreciation and Amortization for the nine months ended September 30,
	2022		2021		Change
	(in thousands)
Same Property Portfolio (1)	$	488,414	$	492,200	$	(3,786)
Properties Acquired Portfolio	25,735		4,735		21,000
Properties Placed In-Service Portfolio (2)	22,655		24,050		(1,395)
Properties in Development or Redevelopment Portfolio	3,329		1,826		1,503
Properties Sold Portfolio	6,138		10,444		(4,306)
	$	546,271	$	533,255	$	13,016

_____________

(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 $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 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.

62

Other Income and Expense Items

Loss from Unconsolidated Joint Ventures

For the nine months ended September 30, 2022 compared to 2021, loss from unconsolidated joint ventures decreased by approximately $0.4 million primarily due to an approximately $10.0 million increase in net income from placing in-service (1) 7750 Wisconsin Avenue (Marriott International Headquarters) in Bethesda, Maryland and (2) 100 Causeway Street in Boston, Massachusetts. This increase was partially offset by a $10.3 million gain on sale of investment from the sale of our Annapolis Junction joint venture interest during the nine months ended September 30, 2021.

Gains on Sales of Real Estate

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 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.

BXP

Gains on sales of real estate increased by approximately $373.2 million for the nine months ended September 30, 2022 compared to 2021, as detailed below.

Name	Date Sold	Property Type	Square Feet	Sale Price		Net Cash Proceeds		Gain on Sale of Real Estate
				(dollars in millions)
2022
195 West Street	March 31, 2022	Office	63,500	$	37.7	$	35.4	$	22.7
Virginia 95 Office Park	June 15, 2022	Office/Flex	733,421	127.5		121.9		96.2
601 Massachusetts Avenue	August 30, 2022	Office	478,667	531.0		512.3		237.4
Broadrun Land Parcel	September 15, 2022	Land	N/A	27.0		25.6		24.4
				$	723.2	$	695.2	$	380.7	(1)
2021
6595 Springfield Center Drive	December 13, 2018	Office	634,000	N/A		N/A		$	8.1	(2)
				N/A		N/A		$	8.1

_____________

(1)Excludes approximately $0.6 million of gains on sales of real estate recognized during the nine months ended September 30, 2022 related to gains on sales of real estate occurring in the prior periods.

(2)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. The development project achieved final completion during the third quarter of 2021 at which time 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.

63

BPLP

Gains on sales of real estate increased by approximately $377.2 million for the nine months ended September 30, 2022 compared to 2021, as detailed below.

Name	Date Sold	Property Type	Square Feet	Sale Price		Net Cash Proceeds		Gain on Sale of Real Estate
				(dollars in millions)
2022
195 West Street	March 31, 2022	Office	63,500	$	37.7	$	35.4	$	23.4
Virginia 95 Office Park	June 15, 2022	Office/Flex	733,421	127.5		121.9		99.5
601 Massachusetts Avenue	August 30, 2022	Office	478,667	531.0		512.3		237.5
Broadrun Land Parcel	September 15, 2022	Land	N/A	27.0		25.6		24.4
				$	723.2	$	695.2	$	384.8	(1)
2021
6595 Springfield Center Drive	December 13, 2018	Office	634,000	N/A		N/A		$	8.1	(2)
				N/A		N/A		$	8.1

_____________

(1)Excludes approximately $0.5 million of gains on sales of real estate recognized during the nine months ended September 30, 2022 related to gains on sales of real estate occurring in the prior periods.

(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. The development project achieved final completion during the third quarter of 2021 at which time 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.

Interest and Other Income (Loss)

Interest and other income (loss) increased by approximately $2.0 million for the nine months ended September 30, 2022 compared to 2021, due primarily to an increase of approximately $2.0 million in interest income due to increased interest earned on our deposits.

Other Income - Assignment Fee

On April 19, 2021, we entered into an agreement to acquire 11251 Roger Bacon Drive in Reston, Virginia for an aggregate purchase price of approximately $5.6 million. On April 7, 2022, we executed an agreement to assign the right to acquire 11251 Roger Bacon Drive to a third party for an assignment fee of approximately $6.9 million. Net cash proceeds totaled approximately $6.6 million and is reflected as Other income - assignment fee. 11251 Roger Bacon Drive is an approximately 65,000 square foot office building situated on approximately 2.6 acres. The property was 100% leased.

Gains (Losses) from Investments in Securities

Gains (losses) from investments in securities for the nine months ended September 30, 2022 and 2021 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 (losses) from investments in securities. During the nine months ended September 30, 2022 and 2021, we recognized gains (losses) of approximately $(8.5) million and $3.7 million, respectively, on these investments. By comparison, our general and administrative expense increased (decreased) by approximately $(8.5) million and $3.7 million during the nine months ended September 30, 2022 and 2021, respectively, as a result of increases (decreases) in our liability under our deferred compensation plans that was

64

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. 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 facility (“Delayed Draw Facility”) under its 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 the acceleration of remaining unamortized financing costs.

Interest Expense

Interest expense decreased by approximately $2.8 million for the nine months ended September 30, 2022 compared to 2021, as detailed below.

Component	Change in interest expense for the nine months ended September 30, 2022 compared to September 30, 2021
	(in thousands)
Increases to interest expense due to:
Issuance of $850 million in aggregate principal of 2.450% senior notes due 2033 on September 29, 2021	$	15,521
Increase in interest associated with unsecured credit facilities and term loans	9,672
Issuance of $850 million in aggregate principal of 2.550% senior notes due 2032 on March 16, 2021	4,577
Amortization expense of financing fees primarily related to the unsecured term loan	2,208
Total increases to interest expense	31,978
Decreases to interest expense due to:
Redemption of $1.0 billion in aggregate principal of 3.85% senior notes due 2023 on October 15, 2021	(29,051)
Redemption of $850 million in aggregate principal of 4.125% senior notes due 2021 on February 14, 2021	(4,279)
Increase in capitalized interest related to development projects	(855)
Other interest expense (excluding senior notes)	(592)
Total decreases to interest expense	(34,777)
Total change in interest expense	$	(2,799)

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, 2022 and 2021 was approximately $40.0 million and $39.3 million, respectively. These costs are not included in the interest expense referenced above.

We expect our interest expense will be materially greater in 2023 compared to 2022 due to the cessation of capitalized interest on our development deliveries, acquisitions funded by debt, higher interest rates on our floating rate debt, and the impact of refinancing our 2023 debt maturities at materially higher interest rates.

65

At September 30, 2022, our variable rate debt consisted of BPLP’s $1.5 billion revolving facility (the “Revolving Facility”) and BPLP’s $730.0 million unsecured credit agreement (the “Unsecured Term Loan”.) The Revolving Facility and Unsecured Term Loan had approximately $1.1 billion outstanding as of September 30, 2022. For a summary of our consolidated debt as of September 30, 2022 and 2021 refer to the heading “Liquidity and Capital Resources—Debt Financing” within “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

Noncontrolling Interests in Property Partnerships

Noncontrolling interests in property partnerships increased by approximately $2.3 million for the nine months ended September 30, 2022 compared to 2021, as detailed below.

Property	Noncontrolling Interests in Property Partnerships for the nine months ended September 30,
	2022		2021		Change
	(in thousands)
767 Fifth Avenue (the General Motors Building)	$	9,338	$	8,873	$	465
Times Square Tower	15,394		14,915		479
601 Lexington Avenue (1)	9,281		11,245		(1,964)
100 Federal Street	9,814		10,211		(397)
Atlantic Wharf Office Building (2)	11,069		7,358		3,711
	$	54,896	$	52,602	$	2,294

_____________

(1)The decrease was primarily attributable to an increase in operating expenses.

(2)The increase was primarily attributable to an increase in lease revenue from our clients.

Noncontrolling Interest—Common Units of the Operating Partnership

For BXP, noncontrolling interest—common units of the Operating Partnership increased by approximately $47.4 million for the nine months ended September 30, 2022 compared to 2021 due primarily to an increase in allocable income, which was the result of recognizing a greater gain on sales of real estate amount during 2022. Due to our ownership structure, there is no corresponding line item on BPLP’s financial statements.

Preferred Stock/Unit Redemption Charge

On March 2, 2021, BXP issued a redemption notice for 80,000 shares of 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 of Series B Preferred Stock. The redemption price per share of Series B Preferred Stock was $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, we 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. The excess of the redemption price over the carrying value of the Series B Preferred Stock and Series B Preferred Units of approximately $6.4 million relates to the original issuance costs and is reflected as a reduction to Net Income Attributable to Boston Properties, Inc. common shareholders and Net Income Attributable to Boston Properties Limited Partnership common unitholders on the Consolidated Income Statement.

Results of Operations for the Three Months Ended September 30, 2022 and 2021

Net income attributable to Boston Properties, Inc. and net income attributable to Boston Properties Limited Partnership increased approximately $252.7 million and $281.6 million for the three months ended September 30, 2022 compared to 2021, respectively, as detailed in the following tables and for the reasons discussed below under the heading “Comparison of the three months ended September 30, 2022 to the three months ended September 30, 2021” within “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

The following are reconciliations of Net Income Attributable to Boston Properties, Inc. to Net Operating Income and Net Income Attributable to Boston Properties Limited Partnership to Net Operating Income for the three months ended September 30, 2022 and 2021. For a detailed discussion of NOI, including the reasons management believes NOI is useful to investors, see page 68.

66

BXP

	Three months ended September 30,
	2022		2021		Increase/ (Decrease)		% Change
	(in thousands)
Net Income Attributable to Boston Properties, Inc.	$	360,977	$	108,297	$	252,680	233.32	%
Net Income Attributable to Noncontrolling Interests:
Noncontrolling interest—common units of the Operating Partnership	40,883		11,982		28,901		241.20	%
Noncontrolling interests in property partnerships	18,801		18,971		(170)		(0.90)	%
Net Income	420,661		139,250		281,411		202.09	%
Other Expenses:
Add:
Interest expense	111,846		105,794		6,052		5.72	%
Losses from investments in securities	1,571		190		1,381		726.84	%
Loss from unconsolidated joint ventures	3,524		5,597		(2,073)		(37.04)	%
Other Income:
Less:
Interest and other income (loss)	3,728		1,520		2,208		145.26	%
Gains on sales of real estate	262,345		348		261,997		75,286.49	%
Other Expenses:
Add:
Depreciation and amortization expense	190,675		179,412		11,263		6.28	%
Transaction costs	1,650		1,888		(238)		(12.61)	%
Payroll and related costs from management services contracts	3,900		3,006		894		29.74	%
General and administrative expense	32,519		34,560		(2,041)		(5.91)	%
Other Revenue:
Less:
Direct reimbursements of payroll and related costs from management services contracts	3,900		3,006		894		29.74	%
Development and management services revenue	7,465		6,094		1,371		22.50	%
Net Operating Income	$	488,908	$	458,729	$	30,179	6.58	%

67

BPLP

	Three months ended September 30,
	2022		2021		Increase/ (Decrease)		% Change
	(in thousands)
Net Income Attributable to Boston Properties Limited Partnership	$	403,578	$	122,014	$	281,564	230.76	%
Net Income Attributable to Noncontrolling Interests:
Noncontrolling interests in property partnerships	18,801		18,971		(170)		(0.90)	%
Net Income	422,379		140,985		281,394		199.59	%
Other Expenses:
Add:
Interest expense	111,846		105,794		6,052		5.72	%
Losses from investments in securities	1,571		190		1,381		726.84	%
Loss from unconsolidated joint ventures	3,524		5,597		(2,073)		(37.04)	%
Other Income:
Less:
Interest and other income (loss)	3,728		1,520		2,208		145.26	%
Gains on sales of real estate	262,357		348		262,009		75,289.94	%
Other Expenses:
Add:
Depreciation and amortization expense	188,969		177,677		11,292		6.36	%
Transaction costs	1,650		1,888		(238)		(12.61)	%
Payroll and related costs from management services contracts	3,900		3,006		894		29.74	%
General and administrative expense	32,519		34,560		(2,041)		(5.91)	%
Other Revenue:
Less:
Direct reimbursements of payroll and related costs from management services contracts	3,900		3,006		894		29.74	%
Development and management services revenue	7,465		6,094		1,371		22.50	%
Net Operating Income	$	488,908	$	458,729	$	30,179	6.58	%

NOI is a non-GAAP financial measure equal to net income attributable to Boston Properties, Inc. and net income attributable to Boston Properties Limited Partnership, as applicable, the most directly comparable GAAP financial measures, plus (1) net income attributable to noncontrolling interests, interest expense, losses from investments in securities, 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) interest and other income (loss), gains on sales of real estate, direct reimbursements of payroll and related costs from management 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 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. and net income attributable to Boston Properties Limited Partnership. 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 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 understand our operating results, NOI should be examined in conjunction with net income attributable to Boston Properties, Inc. and net income attributable to Boston Properties Limited Partnership as presented in our Consolidated Financial Statements. NOI should not be considered as a substitute for net

68

income attributable to Boston Properties, Inc. or net income attributable to Boston Properties Limited Partnership (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.

Comparison of the three months ended September 30, 2022 to the three months ended September 30, 2021

The table below shows selected operating information for the Same Property Portfolio and the Total Property Portfolio. The Same Property Portfolio consists of 128 properties totaling approximately 38.6 million net rentable square feet, excluding unconsolidated joint ventures. The Same Property Portfolio includes properties acquired or placed in-service on or prior to July 1, 2021 and owned and in-service through September 30, 2022. The Total Property Portfolio includes the effects of the other properties either acquired, placed in-service, in development or redevelopment after July 1, 2021 or disposed of on or prior to September 30, 2022. 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, 2022 and 2021 with respect to the properties that were acquired, placed in-service, in development or redevelopment or sold.

69

	Same Property Portfolio								Properties Acquired Portfolio				Properties Placed In-Service Portfolio				Properties in Development or Redevelopment Portfolio				Properties Sold Portfolio				Total Property Portfolio
	2022		2021		Increase/ (Decrease)		% Change		2022		2021		2022		2021		2022		2021		2022		2021		2022		2021		Increase/ (Decrease)		% Change
	(dollars in thousands)
Rental Revenue: (1)
Lease Revenue (Excluding Termination Income)	$	678,399	$	657,377	$	21,022	3.20	%	$	13,444	$	495	$	24,744	$	1,752	$	—	$	1,366	$	6,855	$	18,754	$	723,442	$	679,744	$	43,698	6.43	%
Termination Income	1,711		1,874		(163)		(8.70)	%	269		—		—		—		—		—		—		—		1,980		1,874		106		5.66	%
Lease Revenue	680,110		659,251		20,859		3.16	%	13,713		495		24,744		1,752		—		1,366		6,855		18,754		725,422		681,618		43,804		6.43	%
Parking and Other	26,511		22,972		3,539		15.41	%	937		—		—		—		—		—		199		283		27,647		23,255		4,392		18.89	%
Total Rental Revenue (1)	706,621		682,223		24,398		3.58	%	14,650		495		24,744		1,752		—		1,366		7,054		19,037		753,069		704,873		48,196		6.84	%
Real Estate Operating Expenses	262,076		244,283		17,793		7.28	%	3,894		334		5,947		1,162		501		560		2,260		5,897		274,678		252,236		22,442		8.90	%
Net Operating Income (Loss), Excluding Residential and Hotel	444,545		437,940		6,605		1.51	%	10,756		161		18,797		590		(501)		806		4,794		13,140		478,391		452,637		25,754		5.69	%
Residential Net Operating Income (2)	7,316		4,849		2,467		50.88	%	—		—		—		—		—		—		—		—		7,316		4,849		2,467		50.88	%
Hotel Net Operating Income (2)	3,201		1,243		1,958		157.52	%	—		—		—		—		—		—		—		—		3,201		1,243		1,958		157.52	%
Net Operating Income (Loss)	$	455,062	$	444,032	$	11,030	2.48	%	$	10,756	$	161	$	18,797	$	590	$	(501)	$	806	$	4,794	$	13,140	$	488,908	$	458,729	$	30,179	6.58	%

_______________

(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 68. Residential Net Operating Income for the three months ended September 30, 2022 and 2021 is comprised of Residential Revenue of $14,340 and $10,894 less Residential Expenses of $7,024 and $6,045, respectively. Hotel Net Operating Income for the three months ended September 30, 2022 and 2021 is comprised of Hotel Revenue of $11,749 and $5,189 less Hotel Expenses of $8,548 and $3,946, respectively, per the Consolidated Statements of Operations.

70

Same Property Portfolio

Lease Revenue (Excluding Termination Income)

Lease revenue (excluding termination income) from the Same Property Portfolio increased by approximately $21.0 million for the three months ended September 30, 2022 compared to 2021. The increase was a result of our average revenue per square foot increasing by approximately $2.88, contributing approximately $25.4 million, partially offset by an approximately $4.4 million decrease due to our average occupancy decreasing from 91.4% to 90.8%.

Termination Income

Termination income decreased by approximately $0.2 million for the three months ended September 30, 2022 compared to 2021.

Termination income for the three months ended September 30, 2022 related to eight clients across the Same Property Portfolio and totaled approximately $1.7 million, which was primarily related to clients that terminated leases early in San Francisco.

Termination income for the three months ended September 30, 2021 related to six clients across the Same Property Portfolio and totaled approximately $1.9 million, which was primarily related to clients that terminated leases early in New York City.

Parking and Other Revenue

Parking and other revenue increased by approximately $3.5 million for the three months ended September 30, 2022 compared to 2021. Parking revenue increased by approximately $3.9 million and was partially offset by a decrease in other revenue of approximately $0.4 million. The increase in parking revenue was primarily due to an increase in transient and monthly parking.

Real Estate Operating Expenses

Real estate operating expenses from the Same Property Portfolio increased by approximately $17.8 million, or 7.3%, for the three months ended September 30, 2022 compared to 2021, due primarily to an increase in operating expenses, including cleaning, utilities, repairs and maintenance, and roads/grounds/security. The increase in operating expenses was driven by an increase in physical occupancy.

Properties Acquired Portfolio

The table below lists the properties acquired between July 1, 2021 and September 30, 2022. Rental revenue and real estate operating expenses increased by approximately $14.2 million and $3.6 million, respectively, for the three months ended September 30, 2022 compared to 2021, as detailed below.

		Square Feet	Rental Revenue						Real Estate Operating Expenses
Name	Date acquired		2022		2021		Change		2022		2021		Change
			(dollars in thousands)
Shady Grove Innovation District	August 2, 2021	232,278	$	735	$	495	$	240	$	561	$	334	$	227
Madison Centre (1)	May 17, 2022	754,988	12,293		—		12,293		3,125		—		3,125
125 Broadway	September 16, 2022	271,000	1,622		—		1,622		208		—		208
		1,258,266	$	14,650	$	495	$	14,155	$	3,894	$	334	$	3,560

______________

(1)Rental revenue for the three months ended September 30, 2022 includes approximately $0.3 million of termination income.

Properties Placed In-Service Portfolio

The table below lists the properties that were placed in-service or partially placed in-service between July 1, 2021 and September 30, 2022. Rental revenue and real estate operating expenses from our Properties Placed In-Service Portfolio increased by approximately $23.0 million and $4.8 million, respectively, for the three months ended September 30, 2022 compared to 2021, as detailed below.

71

	Quarter Initially Placed In-Service	Quarter Fully Placed In-Service		Rental Revenue						Real Estate Operating Expenses
Name			Square Feet	2022		2021		Change		2022		2021		Change
				(dollars in thousands)
200 West Street (1)	Fourth Quarter, 2020	Fourth Quarter, 2021	273,365	$	4,767	$	1,752	$	3,015	$	1,633	$	932	$	701
Reston Next	Fourth Quarter, 2021	N/A	1,062,000	9,051		—		9,051		2,830		—		2,830
325 Main Street (2)	Second Quarter, 2022	Second Quarter, 2022	414,008	10,082		—		10,082		820		169		651
2100 Pennsylvania Avenue	Second Quarter, 2022	N/A	480,000	160		—		160		288		—		288
880 Winter Street (3)	Third Quarter, 2022	N/A	244,000	684		—		684		376		61		315
			2,473,373	$	24,744	$	1,752	$	22,992	$	5,947	$	1,162	$	4,785

______________

(1)Includes 138,444 square feet of redevelopment that was fully placed in-service in December 2021.

(2)Real estate operating expenses for the three months ended September 30, 2021 were related to demolition costs.

(3)Conversion of a 224,000 square foot office property located in Waltham, Massachusetts to laboratory space.

Properties in Development or Redevelopment Portfolio

The table below lists the properties that were in development or redevelopment between July 1, 2021 and September 30, 2022. Rental revenue and real estate operating expenses from our Properties in Development or Redevelopment Portfolio decreased by approximately $1.4 million and $0.1 million, respectively, for the three months ended September 30, 2022 compared to 2021, as detailed below.

			Rental Revenue						Real Estate Operating Expenses
Name	Date Commenced Development / Redevelopment	Square Feet	2022		2021		Change		2022		2021		Change
			(dollars in thousands)
140 Kendrick - Building A	July 1, 2022	104,000	$	—	$	1,119	$	(1,119)	$	321	$	310	$	11
760 Boylston Street	September 12, 2022	118,000	—		247		(247)		180		250		(70)
		222,000	$	—	$	1,366	$	(1,366)	$	501	$	560	$	(59)

Properties Sold Portfolio

The table below lists the properties we sold between July 1, 2021 and September 30, 2022. Rental revenue and real estate operating expenses from our Properties Sold Portfolio decreased by approximately $12.0 million and $3.6 million, respectively, for the three months ended September 30, 2022 compared to 2021, as detailed below.

				Rental Revenue						Real Estate Operating Expenses
Name	Date Sold	Property Type	Square Feet	2022		2021		Change		2022		2021		Change
				(dollars in thousands)
181, 191 and 201 Spring Street	October 25, 2021	Office	333,000	$	—	$	4,019	$	(4,019)	$	—	$	1,368	$	(1,368)
195 West Street	March 31, 2022	Office	63,500	—		727		(727)		—		189		(189)
Virginia 95 Office Park	June 15, 2022	Office/Flex	733,421	—		3,397		(3,397)		—		925		(925)
601 Massachusetts Avenue	August 30, 2022	Office	478,667	7,054		10,894		(3,840)		2,260		3,415		(1,155)
			1,608,588	$	7,054	$	19,037	$	(11,983)	$	2,260	$	5,897	$	(3,637)

Residential Net Operating Income

Net operating income for our residential same properties increased by approximately $2.5 million for the three months ended September 30, 2022 compared to 2021.

72

The following reflects our occupancy and rate information for our residential same properties for the three months ended September 30, 2022 and 2021.

	Average Monthly Rental Rate (1)						Average Rental Rate Per Occupied Square Foot						Average Physical Occupancy (2)						Average Economic Occupancy (3)
Name	2022		2021		Change (%)		2022		2021		Change (%)		2022		2021		Change (%)		2022		2021		Change (%)
Proto Kendall Square	$	2,895	$	2,642	9.6	%	$	5.32	$	4.82	10.4	%	95.6	%	94.5	%	1.2	%	94.9	%	93.9	%	1.1	%
The Lofts at Atlantic Wharf	$	4,238	$	3,747	13.1	%	$	4.71	$	4.17	12.9	%	99.6	%	96.5	%	3.2	%	99.3	%	95.4	%	4.1	%
The Avant at Reston Town Center (4)	$	2,450	$	2,299	6.6	%	$	2.67	$	2.50	6.8	%	95.4	%	96.3	%	(0.9)	%	95.3	%	96.3	%	(1.0)	%
Signature at Reston	$	2,671	$	2,429	10.0	%	$	2.75	$	2.51	9.6	%	96.3	%	93.2	%	3.3	%	95.9	%	92.0	%	4.2	%
The Skylyne	$	3,400	$	3,307	2.8	%	$	4.27	$	3.92	8.9	%	92.8	%	48.3	%	92.1	%	90.2	%	41.0	%	120.0	%

_______________  

(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.

(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.

(4)See Note 13 to the Consolidated Financial Statements.

Hotel Net Operating Income

The Boston Marriott Cambridge hotel had net operating income of approximately $3.2 million for the three months ended September 30, 2022, representing an increase of approximately $2.0 million compared to the three months ended September 30, 2021.

The following reflects our occupancy and rate information for the Boston Marriott Cambridge hotel for the three months ended September 30, 2022 and 2021.

	2022			2021			Change (%)
Occupancy	75.8		%	49.4		%	53.4	%
Average daily rate	$	328.40		$	222.31		47.7	%
REVPAR	$	249.06		$	109.86		126.7	%

Other Operating Revenue and Expense Items

Development and Management Services Revenue

Development and management services revenue increased by approximately $1.4 million for the three months ended September 30, 2022 compared to 2021. Management services revenue increased by approximately $1.4 million and was primarily related to an increase in property management fees from an unconsolidated joint venture in the Boston region and asset management fees from an unconsolidated joint venture in the Los Angeles region.

General and Administrative Expense

General and administrative expense decreased by approximately $2.0 million for the three months ended September 30, 2022 compared to 2021 primarily due to a decrease in compensation expense of approximately $3.9 million, partially offset by an increase of approximately $1.9 million in other general and administrative expenses. The decrease in compensation expense primarily related to an approximately $1.4 million decrease in the value of

73

our deferred compensation plan, and an approximately $2.5 million decrease in other compensation expenses. The increase in other general and administrative expenses was primarily related to an increase in professional fees.

Wages directly related to the development of rental properties are capitalized and included in real estate assets 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, 2022 and 2021 were approximately $3.9 million and $3.4 million, respectively. These costs are not included in the general and administrative expenses discussed above.

Transaction Costs

Transaction costs decreased by approximately $0.2 million for the three months ended September 30, 2022 compared to 2021 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 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.

BXP

Depreciation and amortization expense increased by approximately $11.3 million for the three months ended September 30, 2022 compared to 2021, as detailed below.

Portfolio	Depreciation and Amortization for the three months ended September 30,
	2022		2021		Change
	(in thousands)
Same Property Portfolio	$	169,996	$	174,548	$	(4,552)
Properties Acquired Portfolio	10,399		737		9,662
Properties Placed In-Service Portfolio	7,980		379		7,601
Properties in Development or Redevelopment Portfolio	1,076		277		799
Properties Sold Portfolio	1,224		3,471		(2,247)
	$	190,675	$	179,412	$	11,263

BPLP

Depreciation and amortization expense increased by approximately $11.3 million for the three months ended September 30, 2022 compared to 2021, as detailed below.

Portfolio	Depreciation and Amortization for the three months ended September 30,
	2022		2021		Change
	(in thousands)
Same Property Portfolio	$	168,290	$	172,813	$	(4,523)
Properties Acquired Portfolio	10,399		737		9,662
Properties Placed In-Service Portfolio	7,980		379		7,601
Properties in Development or Redevelopment Portfolio	1,076		277		799
Properties Sold Portfolio	1,224		3,471		(2,247)
	$	188,969	$	177,677	$	11,292

74

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

Loss from Unconsolidated Joint Ventures

For the three months ended September 30, 2022 compared to 2021, loss from unconsolidated joint ventures decreased by approximately $2.1 million due primarily to an approximately $2.2 million increase in net income from placing in service (1) 7750 Wisconsin Avenue (Marriott International Headquarters) in Bethesda, Maryland and (2) 100 Causeway Street in Boston, Massachusetts.

Gains on Sales of Real Estate

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 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.

BXP

Gains on sales of real estate increased by approximately $262.0 million for the three months ended September 30, 2022 compared to 2021, as detailed below.

Name	Date Sold	Property Type	Square Feet	Sale Price		Net Cash Proceeds		Gain on Sale of Real Estate
				(dollars in millions)
2022
601 Massachusetts Avenue	August 30, 2022	Office	478,667	$	531.0	$	512.3	$	237.4
Broadrun Land Parcel	September 15, 2022	Land	N/A	27.0		25.6		24.4
				$	558.0	$	537.9	$	261.8	(1)
2021
6595 Springfield Center Drive	December 13, 2018	Office	634,000	N/A		N/A		$	0.3	(2)
				N/A		N/A		$	0.3

___________

(1)Excludes approximately $0.5 million of gains on sales of real estate recognized during the three months ended September 30, 2022 related to gains on sales of real estate occurring in the prior periods.

(2)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. The development project achieved final completion during the third quarter of 2021 at which time 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 $0.3 million.

75

BPLP

Gains on sales of real estate increased by approximately $262.0 million for the three months ended September 30, 2022 compared to 2021, as detailed below.

Name	Date Sold	Property Type	Square Feet	Sale Price		Net Cash Proceeds		Gain on Sale of Real Estate
				(dollars in millions)
2022
601 Massachusetts Avenue	August 30, 2022	Office	478,667	$	531	$	512.3	$	237.5
Broadrun Land Parcel	September 15, 2022	Land	N/A	27.0		25.6		24.4
				$	558.0	$	537.9	$	261.9	(1)
2021
6595 Springfield Center Drive	December 13, 2018	Office	634,000	N/A		N/A		$	0.3	(2)
				N/A		N/A		$	0.3

___________

(1)Excludes approximately $0.4 million of gains on sales of real estate recognized during the three months ended September 30, 2022 related to the sale of real estate occurring in the prior periods.

(2)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. The development project achieved final completion during the third quarter of 2021 at which time 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 $0.3 million.

Interest and Other Income (Loss)

Interest and other income (loss) increased by approximately $2.2 million for the three months ended September 30, 2022 compared to 2021, due primarily to an increase of approximately $2.2 million in interest income due to increased interest earned on our deposits.

Losses from Investments in Securities

Losses from investments in securities for the three months ended September 30, 2022 and 2021 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 losses from investments in securities. During the three months ended September 30, 2022 and 2021, we recognized losses of approximately $1.6 million and $0.2 million, respectively, on these investments. By comparison, our general and administrative expense decreased by approximately $1.6 million and $0.2 million during the three months ended September 30, 2022 and 2021, respectively, as a result of decreases 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.

Interest Expense

Interest expense increased by approximately $6.1 million for the three months ended September 30, 2022 compared to 2021, as detailed below.

76

Component	Change in interest expense for the three months ended September 30, 2022 compared to September 30, 2021
	(in thousands)
Increases to interest expense due to:
Increase in interest associated with unsecured credit facilities and term loans	$	7,401
Issuance of $850 million in aggregate principal of 2.450% senior notes due 2033 on September 29, 2021	5,097
Decrease in capitalized interest related to development projects	1,880
Amortization expense of financing fees primarily related to unsecured term loan	1,407
Total increases to interest expense	15,785
Decreases to interest expense due to:
Redemption of $1.0 billion in aggregate principal of 3.85% senior notes due 2023 on October 15, 2021	(9,684)
Other interest expense (excluding senior notes)	(49)
Total decreases to interest expense	(9,733)
Total change in interest expense	$	6,052

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 three months ended September 30, 2022 and 2021 was approximately $12.2 million and $14.2 million, respectively. These costs are not included in the interest expense referenced above.

At September 30, 2022, our outstanding variable rate debt consisted of BPLP’s $1.5 billion Revolving Facility and $730.0 million Unsecured Term Loan. The Revolving Facility and Unsecured Term Loan had approximately $1.1 billion outstanding as of September 30, 2022. For a summary of our consolidated debt as of September 30, 2022 and September 30, 2021 refer to the heading “Liquidity and Capital Resources—Debt Financing” within “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

Noncontrolling Interests in Property Partnerships

Noncontrolling interests in property partnerships decreased by approximately $0.2 million for the three months ended September 30, 2022 compared to 2021, as detailed below.

Property	Noncontrolling Interests in Property Partnerships for the three months ended September 30,
	2022		2021		Change
	(in thousands)
767 Fifth Avenue (the General Motors Building)	$	3,289	$	3,406	$	(117)
Times Square Tower	4,911		4,995		(84)
601 Lexington Avenue (1)	3,630		4,436		(806)
100 Federal Street	3,393		3,421		(28)
Atlantic Wharf Office Building (2)	3,578		2,713		865
	$	18,801	$	18,971	$	(170)

_______________

(1)The decrease was primarily attributable to an increase in operating expenses.

(2)The increase was primarily attributable to an increase in lease revenue from our clients.

Noncontrolling Interest—Common Units of the Operating Partnership

For BXP, noncontrolling interest—common units of the Operating Partnership increased by approximately $28.9 million for the three months ended September 30, 2022 compared to 2021 due primarily to an increase in

77

allocable income, which was the result of recognizing a greater gain on sales of real estate during 2022. Due to our 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 the Unsecured Term Loan and balloon payments on maturing debt;

•fund development and redevelopment costs;

•fund capital expenditures, including major renovations, tenant improvements and leasing costs;

•fund pending and possible acquisitions of properties, either directly or indirectly through the acquisition of equity interests therein; 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;

•borrowings under BPLP’s Revolving Facility, unsecured term loans, short-term bridge facilities and construction loans;

•long-term secured and unsecured indebtedness (including unsecured exchangeable indebtedness);

•sales of real estate;

•private equity sources including through our Strategic Capital Program (“SCP”) with large institutional investors; and

•issuances of BXP equity securities and/or preferred or common units of partnership interests in BPLP.

We draw on multiple financing sources to fund our long-term capital needs. We expect to fund our current development/redevelopment properties primarily with our available cash balances, construction loans, unsecured term loans, proceeds from asset sales and BPLP’s Revolving Facility. We use BPLP’s Revolving Facility 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, our available cash and access to cost effective capital at the given time.

78

The following table presents information on properties under construction and redevelopment as of September 30, 2022 (dollars in thousands):

									Financings
Construction Properties	Estimated Stabilization Date	Location	# of Buildings	Estimated Square Feet	Investment to Date (1)(2)(3)		Estimated Total Investment (1)(2)		Total Available (1)		Outstanding at September 30, 2022 (1)		Estimated Future Equity Requirement (1)(2)(4)		Percentage Leased (5)
Office
140 Kendrick - Building A (Redevelopment)	Third Quarter, 2023	Needham, MA	1	104,000	$	4,163	$	26,600	$	—	$	—	$	22,437	100	%
Reston Next	Fourth Quarter, 2023	Reston, VA	2	1,062,000	560,445		715,300		—		—		154,855		87	%	(6)
2100 Pennsylvania Avenue	Third Quarter, 2024	Washington, DC	1	480,000	301,118		356,100		—		—		54,982		61	%	(7)
360 Park Avenue South (42% ownership)	First Quarter, 2025	New York, NY	1	450,000	200,474		219,000		92,774		87,299		13,051		—	%	(8)
Reston Next Office Phase II	Second Quarter, 2025	Reston, VA	1	90,000	15,321		61,000		—		—		45,679		—	%
Platform 16 Building A (55% ownership)	Fourth Quarter, 2026	San Jose, CA	1	389,500	78,343		231,900		—		—		153,557		—	%	(9)
Total Office Properties under Construction			7	2,575,500	1,159,864		1,609,900		92,774		87,299		444,561		51	%
Laboratory/Life Sciences
880 Winter Street (Redevelopment)	First Quarter, 2023	Waltham, MA	1	244,000	100,112		108,000		—		—		7,888		97	%	(10)
751 Gateway (49% ownership)	Second Quarter, 2024	South San Francisco, CA	1	231,000	81,235		127,600		—		—		46,365		100	%
103 CityPoint	Third Quarter, 2024	Waltham, MA	1	113,000	33,288		115,100		—		—		81,812		—	%
180 CityPoint	Fourth Quarter, 2024	Waltham, MA	1	329,000	119,190		274,700		—		—		155,510		43	%
651 Gateway (50% ownership) (Redevelopment)	Fourth Quarter, 2025	South San Francisco, CA	1	327,000	33,738		146,500		—		—		112,762		—	%
Total Laboratory/Life Sciences Properties under Construction			5	1,244,000	367,563		771,900		—		—		404,337		49	%
Residential
Reston Next Residential (508 units) (20% ownership)	Second Quarter, 2026	Reston, VA	1	417,000	11,394		47,700		28,000		4,116		12,422		—	%
Total Residential Property under Construction			1	417,000	11,394		47,700		28,000		4,116		12,422		—
Retail
760 Boylston Street (Redevelopment)	Second Quarter, 2024	Boston, MA	1	118,000	2,355		43,800		—		—		41,445		100	%
Total Retail Property under Construction			1	118,000	2,355		43,800		—		—		41,445		100	%
Other
View Boston Observatory at The Prudential Center (Redevelopment)	N/A	Boston, MA	—	59,000	136,896		182,300		—		—		45,404		N/A		(11)
Total Properties under Construction			14	4,413,500	$	1,678,072	$	2,655,600	$	120,774	$	91,415	$	948,169	52	%	(12)

___________  

(1)Represents our share.

79

(2)Each of Investment to Date, Estimated Total Investment and Estimated Future Equity Requirement represent 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, 2022.

(3)Includes approximately $95.9 million of unpaid but accrued construction costs and leasing commissions.

(4)Excludes approximately $95.9 million of unpaid but accrued construction costs and leasing commissions.

(5)Represents percentage leased as of November 1, 2022, including leases with future commencement dates.

(6)The property was 69% placed in-service as of September 30, 2022.

(7)The property was 6% placed in-service as of September 30, 2022.

(8)Investment to Date includes all related costs incurred prior to the contribution of the property by us to the joint venture on December 15, 2021 totaling approximately $107 million and our proportionate share of the loan. Our joint venture partners will fund required capital until their aggregate investment is approximately 58% of all capital contributions; thereafter, the joint venture partners will fund required capital according to their percentage interests.

(9)Estimated total investment represents the costs to complete Building A, a 389,500 square foot building, and Building A’s proportionate share of land and garage costs. In conjunction with the construction of Building A, garage and site work will be completed for Phase II, which will support approximately 700,000 square feet of development in two office buildings, budgeted to be an incremental $141 million.

(10)The property was 25% placed in-service as of September 30, 2022.

(11)We expect to place this project in-service and open to the public in the second quarter of 2023.

(12)Percentage leased excludes the residential property and the View Boston Observatory at The Prudential Center (redevelopment) at 800 Boylston Street - The Prudential Center. Estimated total investment excludes approximately $210 million related to the redevelopment of 300 Binney Street which is currently in-service. We terminated our existing lease agreement with Biogen at 300 Binney Street to facilitate the redevelopment of the property, which is expected to begin in early 2023. Biogen will be vacating the property in phases through early 2023. The project is 100% pre-leased. The commencement of construction is subject to various conditions. There can be no assurance that we will commence the redevelopment on the terms and schedule currently contemplated or at all.

80

Lease revenue (which includes recoveries from clients), other income from operations, available cash balances, mortgage financings, unsecured indebtedness and draws on BPLP’s Revolving Facility are the principal sources of capital that we use to fund 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 client turnover and controlling operating expenses. Our sources of revenue also include third-party fees generated by our property management, leasing, development and construction businesses, as well as the sale of assets from time to time. We believe these sources of capital will continue to provide the funds necessary for our short-term liquidity needs. Material adverse changes in one or more sources of capital may adversely affect our net cash flows.

We expect our primary uses of capital over the next twelve months will be to fund the anticipated acquisition of an approximate 27% interest in the joint venture that owns 200 Fifth Avenue in New York City, the commencement, continuation and completion of our current and committed development and redevelopment projects, repaying debt maturities (as discussed below), servicing the interest payments on our outstanding indebtedness, and satisfying our REIT distribution requirements.

As of September 30, 2022, we had 14 properties under development or redevelopment. Our share of the remaining development and redevelopment costs of active development and redevelopment projects that we expect to fund through 2026 was approximately $948.2 million (excluding costs related to 300 Binney Street). In the third quarter of 2022, we commenced two redevelopment projects and committed to begin a third redevelopment project in early 2023 described below:

•140 Kendrick Street Building A in Needham, Massachusetts. When completed, the building will consist of approximately 104,000 net rentable square feet and will be the first net zero, carbon neutral office repositioning of this scale in Massachusetts. This project is 100% pre-leased.

•760 Boylston Street, a retail property at the Prudential Center in Boston, Massachusetts. The redevelopment is a modernization of the approximately 118,000 net rentable square foot space. This project is 100% pre-leased.

•300 Binney Street in Cambridge, Massachusetts. The conversion of this approximately 195,000 net rentable square foot property into an approximately 240,000 net rentable square foot laboratory/life sciences property has a total budgeted cost of $210.0 million and is expected to begin in early 2023. This project is 100% pre-leased. There can be no assurance that we will commence the redevelopment on the terms and schedule currently contemplated or at all.

On September 16, 2022, we acquired 125 Broadway in Cambridge, Massachusetts for a net purchase price, including transaction costs, of approximately $592.4 million. The acquisition was completed with available cash and borrowings under BPLP’s Revolving Facility. 125 Broadway is a 271,000 square foot, six-story, laboratory/life sciences property. The property is 100% leased.

In the third quarter of 2022, we completed the sale of 601 Massachusetts Avenue located in Washington, DC and two parcels of land located in Loudoun County, Virginia for aggregate net proceeds of $537.9 million. On October 6, 2022, we entered into an agreement to sell the residential component of The Avant at Reston Town Center located in Reston, Virginia for a gross sale price of $141 million. There can be no assurance that we will complete the sale on the terms currently contemplated or at all.

In July 2021, we announced the formation of the SCP with two partners each having a targeted equity commitment of $1.0 billion and a $250 million commitment from us. Under this agreement, we agreed to provide these partners, for up to two years, exclusive first offers to form joint ventures with us to invest in assets that meet target criteria. All investments are discretionary to each partner.

The SCP 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, enhances our returns through fee income, and in some investments provides us the opportunity to realize a greater share of income upon achieving certain success criteria. These large financial partners are among the world’s largest sovereign wealth funds and pension plans. As we move forward, we anticipate increasing our use of joint venture partner equity to manage our debt levels.

81

We have no remaining debt maturities in 2022. Our 2023 debt maturities include (1) the Unsecured Term Loan, which matures on May 16, 2023, and (2) $500.0 million aggregate principal amount of BPLP’s 3.125% senior unsecured notes, which mature on September 1, 2023. In our unconsolidated joint venture portfolio, we have approximately $533.6 million (our share) of debt maturating in 2023. We expect to fund 2023 debt maturities using available cash balances, proceeds from asset sales, BPLP’s Revolving Facility, and/or through refinancings. We expect our interest expense will be materially greater in 2023 compared to 2022 due to the cessation of capitalized interest on our development deliveries, acquisitions funded by debt, higher interest rates on our floating rate debt, and the impact of refinancing our 2023 debt maturities at materially higher interest rates.

As of November 1, 2022, we had available cash of approximately $268.5 million (of which approximately $100.3 million is attributable to our consolidated joint venture partners). Our liquidity and capital resources depend on a wide range of factors and we believe that our access to capital and our strong liquidity, including the approximately $1.1 billion available under the Revolving Facility and our available cash, as of November 1, 2022, are sufficient to fund our remaining capital requirements on existing development and redevelopment projects, fund acquisitions, repay or refinance our maturing indebtedness when due, satisfy our REIT distribution requirements and still allow us to act opportunistically on attractive investment opportunities.

We may seek to enhance our liquidity to fund our current and future development activity, pursue additional attractive investment opportunities and refinance or repay indebtedness. Depending on interest rates, the overall conditions in the debt and public and private equity markets, and our leverage at the time, we may decide to access one or more of these capital sources (including utilization of BXP’s $600.0 million “at the market” equity offering program). Doing so may result in us carrying additional cash and cash equivalents pending our use of the proceeds, which could increase our net interest expense or be dilutive to our earnings, or both.

We have not sold any shares under BXP’s $600.0 million “at the market” equity offering program.

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. Common and LTIP unitholders (other than unearned MYLTIP units) of limited partnership interest in BPLP receive the same total distribution per unit.

BXP’s Board of Directors will continue to evaluate BXP’s dividend rate in light of our actual and projected taxable income (including gains on sales), liquidity requirements and other circumstances and there can be no assurance that the future dividends declared by BXP’s Board of Directors will not differ 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.

82

Cash and cash equivalents and cash held in escrows aggregated approximately $448.9 million and $1.1 billion at September 30, 2022 and 2021, respectively, representing a decrease of approximately $633.0 million. The following table sets forth changes in cash flows:

	Nine months ended September 30,
	2022		2021		Change
	(in thousands)
Net cash provided by operating activities	$	912,403	$	786,859	$	125,544
Net cash used in investing activities	(1,313,220)		(998,368)		(314,852)
Net cash provided by (used in) financing activities	348,545		(425,899)		774,444

Our principal source of cash flow is related to the operation of our properties. The weighted-average term of our in-place leases, including leases signed by our unconsolidated joint ventures, excluding residential units, was approximately 7.8 years as of September 30, 2022, with occupancy rates historically in the range of 88% to 94%. Generally, 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 borrowings.

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 our market position. Cash used in investing activities for the nine months ended September 30, 2022 and September 30, 2021 is detailed below:

	Nine months ended September 30,
	2022		2021
	(in thousands)
Acquisitions of real estate (1)	$	(1,320,273)	$	(218,679)
Construction in progress (2)	(384,083)		(381,104)
Building and other capital improvements	(112,755)		(103,840)
Tenant improvements	(139,986)		(218,878)
Proceeds from the sales of real estate (3)	695,231		—
Proceeds from assignment fee (4)	6,624		—
Capital contributions to unconsolidated joint ventures (5)	(109,643)		(95,462)
Capital distributions from unconsolidated joint ventures (6)	36,622		122
Proceeds from sale of investment in unconsolidated joint venture (7)	—		17,789
Proceeds from note receivable (8)	10,000		—
Investments in securities, net	5,043		1,684
Net cash used in investing activities	$	(1,313,220)	$	(998,368)

Cash used in investing activities changed primarily due to the following:

(1)On September 16, 2022, we acquired 125 Broadway in Cambridge, Massachusetts for a net purchase price, including transaction costs, of approximately $592.4 million. The acquisition was completed with available cash and borrowings under BPLP’s Revolving Facility. 125 Broadway is a 271,000 net rentable square foot, six-story, laboratory/life sciences property.

On May 17, 2022, we completed the acquisition of Madison Centre in Seattle, Washington, for an aggregate     purchase price, including transaction costs, of approximately $724.3 million. Madison Centre is an approximately 755,000 net rentable square foot, 37-story, LEED-Platinum certified, premier workplace.

83

On August 2, 2021, we 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, seven-building office park situated on an approximately 31-acre site.

On June 2, 2021, we acquired 153 & 211 Second Avenue located in Waltham, Massachusetts for a         purchase price of approximately $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, 2022 included ongoing expenditures associated with Reston Next, 2100 Pennsylvania Avenue and 880 Winter Street, each of which are partially placed in-service, and 325 Main Street, which was completed and fully placed in-service during the nine months ended September 30, 2022. In addition, we incurred costs associated with our continued development/redevelopment of 180 CityPoint, View Boston Observatory at The Prudential Center, 103 CityPoint, Reston Next Office Phase II, 140 Kendrick Street Building A and 760 Boylston Street.

Construction in progress for the nine months ended September 30, 2021 included ongoing expenditures associated with 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, Reston Next, 180 CityPoint, View Boston Observatory at The Prudential Center and 880 Winter Street.

(3)On August 30, 2022, we completed the sale of 601 Massachusetts Avenue located in Washington, DC for a gross sale price of $531.0 million. Net cash proceeds totaled approximately $512.3 million, resulting in a gain on sale of real estate totaling approximately $237.4 million for BXP and approximately $237.5 million for BPLP. 601 Massachusetts Avenue is an approximately 479,000 net rentable square foot premier workplace.

On September 15, 2022, we completed the sale of two parcels of land located in Loudoun County, Virginia for a gross sale price of $27.0 million. Net cash proceeds totaled approximately $25.6 million, resulting in a gain on sale of real estate totaling approximately $24.4 million for BXP and BPLP.

On June 15, 2022, we completed the sale of our Virginia 95 Office Park properties located in Springfield, Virginia for an aggregate gross sale price of $127.5 million. Net cash proceeds totaled approximately $121.9 million, resulting in a gain on sale of real estate totaling approximately $96.2 million for BXP and approximately $99.5 million for BPLP. Virginia 95 Office Park consists of eleven office/flex properties aggregating approximately 733,000 net rentable square feet.

On March 31, 2022, we completed the sale of 195 West Street located in Waltham, Massachusetts for a gross sale price of $37.7 million. Net cash proceeds totaled approximately $35.4 million, resulting in a gain on sale of real estate totaling approximately $22.7 million for BXP and approximately $23.4 million for BPLP. 195 West Street is an approximately 63,500 net rentable square foot office property.

(4)On April 19, 2021, we entered into an agreement to acquire 11251 Roger Bacon Drive in Reston, Virginia for an aggregate purchase price of approximately $5.6 million. On April 7, 2022, we executed an agreement to assign the right to acquire 11251 Roger Bacon Drive to a third party for an assignment fee of approximately $6.9 million. Net cash proceeds totaled approximately $6.6 million. 11251 Roger Bacon Drive is an approximately 65,000 square foot office building situated on approximately 2.6 acres. The property was 100% leased.

(5)Capital contributions to unconsolidated joint ventures for the nine months ended September 30, 2022 consisted primarily of cash contributions of approximately $44.8 million, $31.6 million and $16.4 million to our Gateway Commons, Platform 16 and 751 Gateway joint ventures, respectively.

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 Safeco 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 Seattle, Washington.

84

(6)Capital distributions from unconsolidated joint ventures for the nine months ended September 30, 2022 consisted primarily of a cash distribution totaling approximately $21.6 million and $11.6 million from our Metropolitan Square and 7750 Wisconsin Avenue joint ventures, respectively.

(7)On March 30, 2021, we completed the sale of our 50% ownership interest in Annapolis Junction NFM LLC to the joint venture partner for a gross sale 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.

(8)An affiliate of The Bernstein Companies exercised its option to borrow $10.0 million from us, and we provided the financing on June 1, 2020. The financing bore interest at a fixed rate of 8.00% per annum, compounded monthly, and was scheduled to mature on the fifth anniversary of the date on which the base building of the affiliate of The Bernstein Companies’ hotel property was substantially completed. On June 27, 2022, the borrower repaid the loan in full, including approximately $1.6 million of accrued interest.

Cash provided by financing activities for the nine months ended September 30, 2022 totaled approximately $348.5 million. This amount consisted primarily of borrowings under BPLP’s Revolving Facility and Unsecured Term Loan partially offset by the payment of our regular dividends and distributions to our shareholders and unitholders and distributions to noncontrolling interests in property partnerships. Future debt payments are discussed below under the heading “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 (in thousands except for percentages):

	September 30, 2022
	Shares / Units Outstanding	Common Stock Equivalent	Equivalent Value (1)
Common Stock	156,755	156,755	$	11,751,922
Common Operating Partnership Units	18,215	18,215	1,365,579			(2)
Total Equity		174,970	$	13,117,501
Consolidated Debt			$	13,832,871
Add:
BXP’s share of unconsolidated joint venture debt (3)			1,450,624
Subtract:
Partners’ share of Consolidated Debt (4)			(1,357,896)
BXP’s Share of Debt			$	13,925,599
Consolidated Market Capitalization			$	26,950,372
BXP’s Share of Market Capitalization			$	27,043,100
Consolidated Debt/Consolidated Market Capitalization			51.33		%
BXP’s Share of Debt/BXP’s Share of Market Capitalization			51.49		%

_______________  

(1)Values are based on the closing price per share of BXP’s Common Stock on the New York Stock Exchange on September 30, 2022 of $74.97.

(2)Includes long-term incentive plan units (including 2012 OPP Units and 2013 - 2019 MYLTIP Units) but excludes the 2020 - 2022 MYLTIP Units because the three-year performance periods have not ended.

(3)See page 90 for additional information.

(4)See page 89 for additional information.

Consolidated Debt to Consolidated Market Capitalization Ratio is a measure of leverage commonly used by analysts in the REIT 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:

85

(1)     our consolidated debt; plus

(2)     the product of (x) the closing price per share of BXP Common Stock on September 30, 2022, as reported by the New York Stock Exchange, multiplied by (y) the sum of:

(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, and 2013 - 2019 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, 2020 - 2022 MYLTIP Units are not included in this calculation as of September 30, 2022.

We also present BXP’s Share of Market Capitalization and BXP’s Share of Debt/BXP’s Share of Market Capitalization, which are 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 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, management 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 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—Investment in Unconsolidated Joint Ventures - Secured Debt” 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—Mortgage Notes Payable” within “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

86

Debt Financing

As of September 30, 2022, we had approximately $13.8 billion of outstanding consolidated indebtedness, representing approximately 51.33% of our Consolidated Market Capitalization as calculated above consisting of approximately (1) $9.5 billion (net of discount and deferred financing fees) in publicly traded unsecured senior notes having a GAAP weighted-average interest rate of 3.43% per annum and maturities in 2023 through 2033, (2) $3.3 billion (net of deferred financing fees) of property-specific mortgage debt having a GAAP weighted-average interest rate of 3.42% per annum and a weighted-average term of 6.1 years, (3) $340.0 million outstanding under BPLP’s Revolving Facility that matures on June 15, 2026 and (4) $730.0 million outstanding under BPLP’s Unsecured Term Loan that matures on May 16, 2023.

The table below summarizes the aggregate carrying value of our mortgage notes payable and BPLP’s unsecured senior notes, line of credit, and Unsecured Term Loan, as well as Consolidated Debt Financing Statistics at September 30, 2022 and September 30, 2021.  

	September 30,
	2022			2021
	(dollars in thousands)
Debt Summary:
Balance
Fixed rate mortgage notes payable, net	$	3,271,157		$	2,898,699
Unsecured senior notes, net	9,491,714			10,479,651
Unsecured line of credit	340,000			—
Unsecured term loan, net	730,000			—
Consolidated Debt	13,832,871			13,378,350
Add:
BXP’s share of unconsolidated joint venture debt, net (1)	1,450,624			1,289,582
Subtract:
Partners’ share of consolidated mortgage notes payable, net (2)	(1,357,896)			(1,190,479)
BXP’s Share of Debt	$	13,925,599		$	13,477,453
	September 30,
	2022			2021
Consolidated Debt Financing Statistics:
Percent of total debt:
Fixed rate	92.26		%	100.00		%
Variable rate	7.74		%	—		%
Total	100.00		%	100.00		%
GAAP Weighted-average interest rate at end of period:
Fixed rate	3.43		%	3.57		%
Variable rate	3.43		%	—		%
Total	3.43		%	3.57		%
Coupon/Stated Weighted-average interest rate at end of period:
Fixed rate	3.32		%	3.47		%
Variable rate	3.40		%	—		%
Total	3.33		%	3.47		%
Weighted-average maturity at end of period (in years):
Fixed rate	5.9			5.9
Variable rate	1.6			—
Total	5.6			5.9

_______________

(1)See page 90 for additional information.

(2)See page 89 for additional information.

87

Unsecured Credit Facility

On June 15, 2021, BPLP amended and restated its prior credit facility (as amended and restated, 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 2021 Credit Facility (1) extended the maturity date from April 24, 2022 to June 15, 2026, (2) eliminated the $500.0 million delayed draw 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 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. Based on BPLP’s September 30, 2022 credit rating, (1) the applicable Eurocurrency and LIBOR Daily Floating Rate margins are 0.775%, (2) the alternate base rate margin is zero basis points and (3) the facility fee is 0.15% per annum.

At September 30, 2022, BPLP had $340.0 million of borrowings under its Revolving Facility and outstanding letters of credit totaling approximately $6.4 million, with the ability to borrow approximately $1.2 billion. At November 1, 2022, BPLP had $440.0 million of borrowings under its Revolving Facility and outstanding letters of credit totaling approximately $6.4 million, with the ability to borrow approximately $1.1 billion.

Unsecured Term Loan

On May 17, 2022, BPLP entered into an Unsecured Term Loan providing for a single borrowing of up to $730.0 million. The Unsecured Term Loan matures on May 16, 2023.

At BPLP’s option, the Unsecured Term Loan will bear interest at a rate per annum equal to (A) (1) a base rate per annum equal to the greater of (a) the federal funds rate plus 0.5%, (b) the administrative agent’s prime rate, (c) term SOFR plus 1.00% and (d) 1.00%, or (2) a term SOFR rate per annum equal to the forward-looking SOFR term rate administered by CME Group Benchmark Administration (“CME”) two business days prior to the commencement of such interest period; or if the rate is unavailable, then the forward-looking SOFR term rate administered by CME on the first business day immediately prior thereto, in each case, plus 0.10%, and (B) a margin ranging from zero to 160 basis points based on BPLP’s credit rating.

On May 17, 2022, BPLP exercised its option to draw $730.0 million under the Unsecured Term Loan (See Notes 3 and 6 to the Consolidated Financial Statements). As of September 30, 2022, the Unsecured Term Loan bears interest at a variable rate equal to term SOFR plus 0.95% per annum based on BPLP’s current credit rating at September 30, 2022. At September 30, 2022, BPLP had $730.0 million outstanding under its Unsecured Term Loan.

88

Unsecured Senior Notes

The following summarizes the unsecured senior notes outstanding as of September 30, 2022 (dollars in thousands): 

	Coupon/Stated Rate		Effective Rate(1)		Principal Amount		Maturity Date(2)
10.5 Year Unsecured Senior Notes	3.125	%	3.279	%	$	500,000	September 1, 2023
10.5 Year Unsecured Senior Notes	3.800	%	3.916	%	700,000		February 1, 2024
7 Year Unsecured Senior Notes	3.200	%	3.350	%	850,000		January 15, 2025
10 Year Unsecured Senior Notes	3.650	%	3.766	%	1,000,000		February 1, 2026
10 Year Unsecured Senior Notes	2.750	%	3.495	%	1,000,000		October 1, 2026
10 Year Unsecured Senior Notes	4.500	%	4.628	%	1,000,000		December 1, 2028
10 Year Unsecured Senior Notes	3.400	%	3.505	%	850,000		June 21, 2029
10.5 Year Unsecured Senior Notes	2.900	%	2.984	%	700,000		March 15, 2030
10.75 Year Unsecured Senior Notes	3.250	%	3.343	%	1,250,000		January 30, 2031
11 Year Unsecured Senior Notes	2.550	%	2.671	%	850,000		April 1, 2032
12 Year Unsecured Senior Notes	2.450	%	2.524	%	850,000		October 1, 2033
Total principal					9,550,000
Less:
Net unamortized discount					14,391
Deferred financing costs, net					43,895
Total					$	9,491,714

_______________

(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, 2022, BPLP was in compliance with each of these financial restrictions and requirements.

Mortgage Notes Payable

The following represents the outstanding principal balances due under the mortgage notes payable at September 30, 2022:

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)
Consolidated Joint Ventures
767 Fifth Avenue (the General Motors Building)	3.43	%	3.64	%	$	2,300,000	$	(16,363)	$	2,283,637	$	913,512	(2)(3)(4)	June 9, 2027
601 Lexington Avenue	2.79	%	2.93	%	1,000,000		(12,480)		987,520		444,384		(2)(5)	January 9, 2032
Total					$	3,300,000	$	(28,843)	$	3,271,157	$	1,357,896

_______________ 

(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, 2022, the maximum funding obligation under the guarantee was approximately $14.9

89

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 7 to the Consolidated Financial Statements).

(5)This property is owned by a consolidated entity in which we have a 55% interest.

Investment in Unconsolidated Joint Ventures - Secured Debt

We have investments in unconsolidated joint ventures with our effective ownership interests ranging from 20% to 55%. Sixteen of these ventures have mortgage indebtedness. We exercise significant influence over, but do not control, these entities. As a result, we account for them using the equity method of accounting. See also Note 5 to the Consolidated Financial Statements. At September 30, 2022, the aggregate carrying amount of debt, including both our and our partners’ share, incurred by these ventures was approximately $3.4 billion (of which our proportionate share is approximately $1.5 billion). The table below summarizes the outstanding debt of these joint venture properties at September 30, 2022. 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. 

Properties	Nominal % 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)
Santa Monica Business Park	55.00	%	4.06	%	4.24	%	$	300,000	$	(1,480)	$	298,520	$	164,186	(2)(3)	July 19, 2025
Market Square North	50.00	%	4.64	%	4.80	%	125,000		(643)		124,357		62,179		(2)(4)	November 10, 2025
1265 Main Street	50.00	%	3.77	%	3.84	%	35,811		(257)		35,554		17,777			January 1, 2032
Colorado Center	50.00	%	3.56	%	3.59	%	550,000		(871)		549,129		274,565		(2)	August 9, 2027
Dock 72	50.00	%	5.45	%	5.72	%	198,383		(655)		197,728		98,864		(2)(5)	December 18, 2023
The Hub on Causeway - Podium	50.00	%	4.78	%	4.94	%	174,329		(269)		174,060		87,030		(2)(6)	September 6, 2023
Hub50House	50.00	%	4.43	%	4.51	%	185,000		(1,325)		183,675		91,837		(2)(7)	June 17, 2032
100 Causeway Street	50.00	%	3.72	%	3.93	%	337,604		(776)		336,828		168,414		(2)(8)	September 5, 2023
7750 Wisconsin Avenue (Marriott International Headquarters)	50.00	%	3.39	%	3.93	%	253,887		(812)		253,075		126,538		(2)(9)	April 26, 2023
360 Park Avenue South	42.21	%	4.87	%	5.33	%	207,030		(2,208)		204,823		86,456		(2)(10)	December 14, 2024
Safeco Plaza	33.67	%	4.41	%	4.55	%	250,000		(1,332)		248,668		83,727		(2)(11)	September 1, 2026
500 North Capitol Street, NW	30.00	%	4.15	%	4.20	%	105,000		(39)		104,961		31,488		(2)	June 6, 2023
901 New York Avenue	25.00	%	3.61	%	3.69	%	213,351		(402)		212,949		53,237			January 5, 2025
3 Hudson Boulevard	25.00	%	5.80	%	5.88	%	80,000		(48)		79,952		19,988		(2)(12)	July 13, 2023
Metropolitan Square	20.00	%	5.12	%	5.90	%	420,000		(4,973)		415,027		83,005		(2)(13)	April 9, 2024
Reston Next Residential	20.00	%	4.75	%	5.06	%	8,231		(1,566)		6,666		1,333		(2)(14)	May 13, 2026
Total							$	3,443,626	$	(17,656)	$	3,425,972	$	1,450,624

_______________

(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.

(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.

90

(5)The construction financing has a borrowing capacity of $198.4 million. The construction financing bears interest at a variable rate equal to (1) the greater of (x) SOFR or (y) 0.25%, plus (2) 3.10% per annum and matures on December 18, 2023.

(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.

(7)The loan bears interest at a variable rate equal to SOFR plus 1.35% per annum and matures on June 17, 2032. The joint venture entered into interest rate swap contracts with notional amounts aggregating $185.0 million through April 10, 2032, resulting in a fixed rate of approximately 4.432% per annum through the expiration of the interest rate swap contracts.

(8)The construction financing has a borrowing capacity of $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 Adjusted Term SOFR plus 2.40% per annum and matures on December 14, 2024, with two, one-year extension options, subject to certain conditions. The spread on the variable rate may be reduced, subject to certain conditions.

(11)The loan bears interest at a variable rate equal to the greater of (x) 2.35% or (y) SOFR plus 2.32% per annum and matures on September 1, 2026. The joint venture entered into an interest rate cap agreement with a financial institution to limit its exposure to increases in the SOFR rate at a cap of 2.50% per annum on a notional amount of $250.0 million through September 1, 2023.

(12)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, 2022, the loan has approximately $17.3 million of accrued interest due at the maturity date.

(13)The indebtedness consists of (x) a $305.0 million mortgage loan payable which bears interest at a variable rate equal to SOFR plus approximately 1.81% and matures on April 9, 2024 with three, one-year extension options, subject to certain conditions, and (y) a $115.0 million mezzanine note payable which bears interest at a variable rate equal to SOFR plus 5.25% and matures on April 9, 2024 with three, 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 SOFR rate at a cap of 4.50% per annum on a notional amount of $420.0 million through April 15, 2024.

(14)The construction financing has a borrowing capacity of $140.0 million. The construction financing bears interest at a variable rate equal to SOFR plus 2.00% per annum and matures on May 13, 2026, with two, one-year extension options, subject to certain conditions.

State and Local Tax Matters 

Because BXP is organized and qualifies as a REIT, it is generally not subject to federal income taxes, but is subject to certain state and local taxes. In the normal course of business, 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 position 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

For information concerning our insurance program, see Note 7 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”), we calculate Funds from Operations, or “FFO,” for each of BXP and BPLP by adjusting net income (loss) attributable to Boston Properties, Inc. and net income (loss) attributable to Boston Properties Limited Partnership (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

91

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. We believe the presentation of FFO, combined with the presentation of required GAAP financial measures, improves the understanding of operating results of REITs among the investing public and helps make comparisons 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’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 Nareit definition or that interpret the current Nareit 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. 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. or net income attributable to Boston Properties Limited Partnership (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.  

BXP

The following table presents a reconciliation of net income attributable to Boston Properties, Inc. to FFO attributable to Boston Properties, Inc. for the three months ended September 30, 2022 and 2021:

	Three months ended September 30,
	2022			2021
	(in thousands)
Net income attributable to Boston Properties, Inc.	$	360,977		$	108,297
Add:
Noncontrolling interest—common units of the Operating Partnership	40,883			11,982
Noncontrolling interests in property partnerships	18,801			18,971
Net income	420,661			139,250
Add:
Depreciation and amortization	190,675			179,412
Noncontrolling interests in property partnerships’ share of depreciation and amortization	(17,706)			(16,773)
BXP’s share of depreciation and amortization from unconsolidated joint ventures	21,485			17,803
Corporate-related depreciation and amortization	(431)			(443)
Less:
Gains on sales of real estate	262,345			348
Noncontrolling interests in property partnerships	18,801			18,971
Funds from Operations (FFO) attributable to the Operating Partnership	333,538			299,930
Less:
Noncontrolling interest—common units of the Operating Partnership’s share of funds from operations	33,787			29,453
Funds from Operations attributable to Boston Properties, Inc.	$	299,751		$	270,477
Our percentage share of Funds from Operations—basic	89.87		%	90.18		%
Weighted average shares outstanding—basic	156,754			156,183

92

Reconciliation to Diluted Funds from Operations: 

	Three months ended September 30,
	2022			2021
	Income (Numerator)		Shares/Units (Denominator)	Income (Numerator)		Shares/Units (Denominator)
	(in thousands)
Basic Funds from Operations	$	333,538	174,416	$	299,930	173,194
Effect of Dilutive Securities:
Stock based compensation	—		379	—		415
Diluted Funds from Operations	$	333,538	174,795	$	299,930	173,609
Less:
Noncontrolling interest—common units of the Operating Partnership’s share of diluted Funds from Operations	33,687		17,662	29,393		17,011
Diluted Funds from Operations attributable to Boston Properties, Inc. (1)	$	299,851	157,133	$	270,537	156,598

 _______________

(1)BXP’s share of diluted Funds from Operations was 89.90% and 90.20% for the three months ended September 30, 2022 and 2021, respectively.

BPLP

The following table presents a reconciliation of net income attributable to Boston Properties Limited Partnership to FFO attributable to Boston Properties Limited Partnership for the three months ended September 30, 2022 and 2021:

	Three months ended September 30,
	2022		2021
	(in thousands)
Net income attributable to Boston Properties Limited Partnership	$	403,578	$	122,014
Add:
Noncontrolling interests in property partnerships	18,801		18,971
Net income	422,379		140,985
Add:
Depreciation and amortization	188,969		177,677
Noncontrolling interests in property partnerships’ share of depreciation and amortization	(17,706)		(16,773)
BXP’s share of depreciation and amortization from unconsolidated joint ventures	21,485		17,803
Corporate-related depreciation and amortization	(431)		(443)
Less:
Gains on sales of real estate	262,357		348
Noncontrolling interests in property partnerships	18,801		18,971
Funds from Operations attributable to Boston Properties Limited Partnership (1)	$	333,538	$	299,930
Weighted average shares outstanding—basic	174,416		173,194

 _______________

(1)Our calculation includes OP Units and vested LTIP Units (including vested 2012 OPP Units and vested 2013 - 2019 MYLTIP Units).

93

Reconciliation to Diluted Funds from Operations: 

	Three months ended September 30,
	2022			2021
	Income (Numerator)		Shares/Units (Denominator)	Income (Numerator)		Shares/Units (Denominator)
	(in thousands)
Basic Funds from Operations	$	333,538	174,416	$	299,930	173,194
Effect of Dilutive Securities:
Stock based compensation	—		379	—		415
Diluted Funds from Operations	$	333,538	174,795	$	299,930	173,609

Material Cash Commitments

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 three months ended September 30, 2022, we paid approximately $60.1 million to fund client-related obligations, including tenant improvements and leasing commissions.

In addition, during the three months ended September 30, 2022, we and our unconsolidated joint venture partners incurred approximately $100.3 million of new client-related obligations associated with approximately 1.0 million square feet of second generation leases, or approximately $99 per square foot. We signed approximately 429,900 square feet of first generation leases. The client-related obligations for the development properties are included within the projects’ “Estimated Total Investment” referred to in “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources.” In aggregate during the third quarter of 2022, we signed leases for approximately 1.4 million square feet of space and incurred aggregate client-related obligations of approximately $198.9 million, or approximately $137 per square foot.

94

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, unsecured term loan, net and our corresponding estimate of fair value as of September 30, 2022. As of September 30, 2022, approximately $12.8 billion 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. As of September 30, 2022, the weighted-average interest rate on our variable rate debt was 3.40% per annum. The following table presents our aggregate debt obligations with corresponding weighted-average GAAP interest rates sorted by maturity date.

The table below does not include our unconsolidated joint venture debt. For a discussion concerning our unconsolidated joint venture debt, see Note 5 to the Consolidated Financial Statements and “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Investment in Unconsolidated Joint Ventures - Secured Debt.”

	2022			2023			2024			2025			2026			2027+			Total			Estimated Fair Value
	(dollars in thousands) Mortgage debt, net
Fixed Rate	$	(1,208)		$	(4,840)		$	(4,840)		$	(4,840)		$	(4,840)		$	3,291,725		$	3,271,157		$	2,788,779
GAAP Average Interest Rate	—		%	—		%	—		%	—		%	—		%	3.42		%	3.42		%
Variable Rate	—			—			—			—			—			—			—			—
	Unsecured debt, net
Fixed Rate	$	(2,690)		$	489,402		$	690,581		$	841,850		$	1,993,259		$	5,479,312		$	9,491,714		$	8,261,816
GAAP Average Interest Rate	—		%	3.28		%	3.92		%	3.35		%	3.63		%	3.33		%	3.43		%
Variable Rate	—			730,000			—			—			340,000			—			1,070,000			1,068,247
Total Debt	$	(3,898)		$	1,214,562		$	685,741		$	837,010		$	2,328,419		$	8,771,037		$	13,832,871		$	12,118,842

At September 30, 2022, the weighted-average coupon/stated rates on the fixed rate debt stated above was 3.32% per annum. At September 30, 2022, our outstanding variable rate debt based on LIBOR totaled approximately $340.0 million and our outstanding variable rate debt based on SOFR totaled $730.0 million. At September 30, 2022, the coupon/stated rate on our variable rate debt was approximately 3.40% per annum. If market interest rates on our variable rate debt had been 100 basis points greater, total interest expense would have increased approximately $2.7 million and $8.0 million for the three and nine months ended September 30, 2022, respectively.

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 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

95

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 a sufficient number of 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.

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, 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, as amended) occurred during the third quarter of our fiscal year ending December 31, 2022 that has materially affected, or is reasonably likely to materially affect, Boston Properties, Inc.’s internal control over financial reporting.

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, 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, as amended) occurred during the third quarter of our fiscal year ending December 31, 2022 that has materially affected, or is reasonably likely to materially affect, its internal control over financial reporting.

96

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 to the extent additional factual information disclosed elsewhere in this Quarterly Report on Form 10-Q relates to such risk factors (including, without limitation, the matters discussed in Part I, “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of 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, 2021.

Enhanced market and economic volatility due to adverse economic and geopolitical conditions, such as the war in Ukraine, health crises or dislocations in the credit markets, could have a material adverse effect on our results of operations, financial condition and ability to pay dividends and/or distributions.

Our business may be adversely affected by market and economic volatility experienced by the U.S. and global economies, the real estate industry as a whole and/or the local economies in the markets in which our properties are located, Such adverse economic and geopolitical conditions may be due to, among other issues, increased labor market challenges impacting the recruitment and retention of employees, rising inflation and interest rates, volatility in the public equity and debt markets, and international economic and other conditions, including pandemics, geopolitical instability (such as the war in Ukraine), sanctions and other conditions beyond our control. These current conditions, or similar conditions existing in the future, may adversely affect our results of operations, financial condition and ability to pay dividends and/or distributions as a result of one or more of the following, among other potential consequences:

•the financial condition of our clients may be adversely affected, which may result in client defaults under leases due to bankruptcy, lack of liquidity, lack of funding, operational failures or for other reasons;

•significant job losses may occur, which may decrease demand for our office space, causing market rental rates and property values to be negatively impacted;

•tightening labor market conditions may adversely affect our ability to recruit and retain talent, which may result in lack of business continuity and increased costs to address the labor challenges;

•our ability to borrow on terms and conditions that we find acceptable, or at all, may be limited, which could reduce our ability to pursue acquisition and development opportunities and refinance existing debt, reduce our returns from our acquisition and development activities and increase our future interest expense;

•reduced values of our properties may limit our ability to dispose of assets at attractive prices or to obtain debt financing secured by our properties and may reduce the availability of unsecured loans;

•the value and liquidity of our short-term investments and cash deposits could be reduced as a result of a deterioration of the financial condition of the institutions that hold our cash deposits or the institutions or assets in which we have made short-term investments, a dislocation of the markets for our short-term investments, increased volatility in market rates for such investments or other factors;

•one or more lenders under our line of credit could refuse to fund their financing commitment to us or could fail and we may not be able to replace the financing commitment of any such lenders on favorable terms, or at all; and

•to the extent we enter into derivative financial instruments, one or more counterparties to our derivative financial instruments could default on their obligations to us, or could fail, increasing the risk that we may not realize the benefits of these instruments.

97

ITEM 2—Unregistered Sales of Equity Securities and Use of Proceeds

Boston Properties, Inc.

(a)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, 2022 – July 31, 2022	1,346	(1)	$	27.10	N/A	N/A
August 1, 2022 – August 31, 2022	873	(2)	$	0.01	N/A	N/A
September 1, 2022 – September 30, 2022	4,731	(3)	$	82.87	N/A	N/A
Total	6,950		$	61.66	N/A	N/A

___________

(1)Includes 937 shares of restricted common stock of BXP repurchased in connection with the termination of a certain employee’s 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 employee for such shares. Also includes 409 shares of BXP common stock surrendered by an employee to BXP to satisfy such employee’s tax withholding obligations in connection with the vesting of restricted common stock.

(2)Represents shares of restricted common stock of BXP repurchased in connection with the termination of a certain employee’s 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 employee for such shares.

(3)Represents shares of BXP common stock surrendered by an employee to BXP to satisfy such employee’s tax withholding obligations in connection with the vesting of restricted common stock.

Boston Properties Limited Partnership

(a)Each time BXP issues shares of common 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, 2022, in connection with issuances of c issuances of restricted common stock to employees under the Boston Properties, Inc. 2021 Stock Incentive Plan and purchases of common stock under the Boston Properties, Inc. 1999 Employee Stock Purchase Plan, BPLP issued an aggregate of 8,754 common units to BXP in exchange for approximately $0.37 million, 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.

98

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, 2022 – July 31, 2022	3,001	(1)(3)	$	12.29	N/A	N/A
August 1, 2022 – August 31, 2022	1,175	(2)(3)	$	0.07	N/A	N/A
September 1, 2022 – September 30, 2022	4,731	(4)	$	82.87	N/A	N/A
Total	8,907		$	48.17	N/A	N/A

___________

(1)Includes 937 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 an employee’s employment with BXP and 1,655 LTIP units that were repurchased by BPLP in connection with the termination of certain employees’ employment with BXP. Also includes 409 common units previously held by BXP that were redeemed in connection with the surrender of shares of restricted common stock of BXP by an employee to BXP to satisfy such employee’s tax withholding obligations in connection with the vesting of restricted common stock.

(2)Includes 873 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 an employee’s employment with BXP and 302 LTIP units that were repurchased by BPLP in connection with the termination of certain employees’ employment with BXP.

(3)Under the terms of the applicable restricted stock award agreements and LTIP unit vesting agreements, the shares were repurchased at a price of $0.01 per share and the LTIP units were repurchased at a price of $0.25 per unit, which were the amounts originally paid by the employees for the shares and units.

(4)Represents common units previously held by BXP that were redeemed in connection with the surrender of shares of restricted common stock of BXP by an employee to BXP to satisfy such employee’s tax withholding obligations in connection with the vesting of restricted common stock.

ITEM 3—Defaults Upon Senior Securities.

None.

ITEM 4—Mine Safety Disclosures.

None.

ITEM 5—Other Information.

(a)None.

(b)None.

99

ITEM 6—Exhibits.

(a)Exhibits 

31.1	—	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 for Boston Properties, Inc. (Filed herewith.)
31.2	—	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 for Boston Properties, Inc. (Filed herewith.)
31.3	—	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 for Boston Properties Limited Partnership. (Filed herewith.)
31.4	—	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 for Boston Properties Limited Partnership. (Filed herewith.)
32.1	—	Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes Oxley Act of 2002 for Boston Properties, Inc. (Furnished herewith.)
32.2	—	Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes Oxley Act of 2002 for Boston Properties, Inc. (Furnished herewith.)
32.3	—	Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes Oxley Act of 2002 for Boston Properties Limited Partnership. (Furnished herewith.)
32.4	—	Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes Oxley Act of 2002 for Boston Properties Limited Partnership. (Furnished herewith.)
101.SCH	—	Inline XBRL Taxonomy Extension Schema Document. (Filed herewith.)
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 Exhibits 101*.). (Filed herewith.)

100

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 4, 2022		/s/    MICHAEL R. WALSH
		Michael R. Walsh
		Chief Accounting Officer (duly authorized officer and principal accounting officer)

101

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 4, 2022		/s/    MICHAEL R. WALSH
		Michael R. Walsh
		Chief Accounting Officer (duly authorized officer and principal accounting officer)

102

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Owen D. Thomas, certify that:

1.    I have reviewed this Quarterly Report on Form 10-Q of Boston Properties, Inc.;

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.    The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)    Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)    Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.    The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: November 4, 2022

/s/    OWEN D. THOMAS

Owen D. Thomas

Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Michael E. LaBelle, certify that:

1.    I have reviewed this Quarterly Report on Form 10-Q of Boston Properties, Inc.;

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.    The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)    Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)    Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.    The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: November 4, 2022

/s/    MICHAEL E. LABELLE      

Michael E. LaBelle

Chief Financial Officer

EX-31.3

Exhibit 31.3

CERTIFICATION

I, Owen D. Thomas, certify that:

1.    I have reviewed this Quarterly Report on Form 10-Q of Boston Properties Limited Partnership;

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.    The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)    Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)    Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.    The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: November 4, 2022

/s/    OWEN D. THOMAS 

Owen D. Thomas
Chief Executive Officer of Boston Properties, Inc.
General Partner of Boston Properties Limited Partnership

EX-31.4

Exhibit 31.4

CERTIFICATION

I, Michael E. LaBelle, certify that:

1.    I have reviewed this Quarterly Report on Form 10-Q of Boston Properties Limited Partnership;

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.    The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)    Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)    Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.    The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: November 4, 2022

/s/    MICHAEL E. LABELLE 

Michael E. LaBelle
Chief Financial Officer of Boston Properties, Inc.
General Partner of Boston Properties Limited Partnership

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned officer of Boston Properties, Inc. (the “Company”) hereby certifies to his knowledge that the Company’s Quarterly Report on Form 10-Q for the period ended September 30, 2022 (the “Report”), as filed with the Securities and Exchange Commission on the date hereof, fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended, and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. This certification shall not be deemed “filed” for any purpose, nor shall it be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934 regardless of any general incorporation language in such filing.

Date: November 4, 2022

/s/    OWEN D. THOMAS  

Owen D. Thomas

Chief Executive Officer

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned officer of Boston Properties, Inc. (the “Company”) hereby certifies to his knowledge that the Company's Quarterly Report on Form 10-Q for the period ended September 30, 2022 (the “Report”), as filed with the Securities and Exchange Commission on the date hereof, fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended, and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. This certification shall not be deemed “filed” for any purpose, nor shall it be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934 regardless of any general incorporation language in such filing.

Date: November 4, 2022

/s/    MICHAEL E. LABELLE        

Michael E. LaBelle

Chief Financial Officer

EX-32.3

Exhibit 32.3

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned officer of Boston Properties, Inc., the sole general partner of Boston Properties Limited Partnership (the “Operating Partnership”), hereby certifies to his knowledge that the Operating Partnership's Quarterly Report on Form 10-Q for the period ended September 30, 2022 (the “Report”), as filed with the Securities and Exchange Commission on the date hereof, fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended, and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Operating Partnership. This certification shall not be deemed “filed” for any purpose, nor shall it be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934 regardless of any general incorporation language in such filing.

Date: November 4, 2022

/s/    OWEN D. THOMAS

Owen D. Thomas
Chief Executive Officer of Boston Properties, Inc.
General Partner of Boston Properties Limited Partnership

EX-32.4

Exhibit 32.4

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned officer of Boston Properties, Inc., the sole general partner of Boston Properties Limited Partnership (the “Operating Partnership”), hereby certifies to his knowledge that the Operating Partnership’s Quarterly Report on Form 10-Q for the period ended September 30, 2022 (the “Report”), as filed with the Securities and Exchange Commission on the date hereof, fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended, and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Operating Partnership. This certification shall not be deemed “filed” for any purpose, nor shall it be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934 regardless of any general incorporation language in such filing.

Date: November 4, 2022

/s/    MICHAEL E. LABELLE        

Michael E. LaBelle
Chief Financial Officer of Boston Properties, Inc.
General Partner of Boston Properties Limited Partnership

XML

Cover - $ / shares	9 Months Ended
	Sep. 30, 2022	Nov. 01, 2022
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
Document Transition Report	false
Entity File Number	1-13087
Entity Registrant Name	BOSTON PROPERTIES, INC.
Entity Central Index Key	0001037540
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-2473675
Entity Address, Address Line One	Prudential Center, 800 Boylston Street, Suite 1900
Entity Address, City or Town	Boston
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02199-8103
City Area Code	617
Local Phone Number	236-3300
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Trading Symbol	BXP
Entity Common Stock, Shares Outstanding		156,754,712
Title of 12(b) Security	Common Stock, par value $0.01 per share
Entity Listing, Par Value Per Share	$ 0.01
Boston Properties Limited Partnership
Entity Information [Line Items]
Document Type	10-Q
Document Period End Date	Sep. 30, 2022
Entity File Number	0-50209
Entity Registrant Name	BOSTON PROPERTIES LIMITED PARTNERSHIP
Entity Central Index Key	0001043121
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-3372948
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,753,779 and $6,702,830 at September 30, 2022 and December 31, 2021, respectively)	$ 25,192,376	$ 23,752,630
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at September 30, 2022 and December 31, 2021, respectively)	237,505	237,507
Right of use assets - operating leases	167,935	169,778
Less: accumulated depreciation (amounts related to VIEs of $(1,352,781) and $(1,283,060) at September 30, 2022 and December 31, 2021, respectively)	(6,170,472)	(5,883,961)
Real estate and development in process, net	19,427,344	18,275,954
Cash and cash equivalents (amounts related to VIEs of $249,124 and $300,937 at September 30, 2022 and December 31, 2021, respectively)	375,774	452,692
Cash held in escrows	73,112	48,466
Investments in securities	30,040	43,632
Tenant and other receivables, net (amounts related to VIEs of $11,842 and $6,824 at September 30, 2022 and December 31, 2021, respectively)	69,633	70,186
Related party note receivable, net	78,592	78,336
Notes receivable, net	0	9,641
Accrued rental income, net (amounts related to VIEs of $359,439 and $357,395 at September 30, 2022 and December 31, 2021, respectively)	1,250,176	1,226,745
Deferred charges, net (amounts related to VIEs of $176,908 and $174,637 at September 30, 2022 and December 31, 2021, respectively)	720,648	618,798
Prepaid expenses and other assets (amounts related to VIEs of $44,525 and $29,668 at September 30, 2022 and December 31, 2021, respectively)	107,538	57,811
Investments in unconsolidated joint ventures	1,593,834	1,482,997
Total assets	23,726,691	22,365,258
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $3,271,157 and $3,267,914 at September 30, 2022 and December 31, 2021, respectively)	3,271,157	3,267,914
Unsecured senior notes, net	9,491,714	9,483,695
Unsecured line of credit	340,000	145,000
Unsecured term loan	730,000	0
Lease liabilities - finance leases (amounts related to VIEs of $20,568 and $20,458 at September 30, 2022 and December 31, 2021, respectively)	248,092	244,421
Lease liabilities - operating leases	205,008	204,561
Accounts payable and accrued expenses (amounts related to VIEs of $35,043 and $29,464 at September 30, 2022 and December 31, 2021, respectively)	360,572	320,775
Dividends and distributions payable	170,952	169,859
Accrued interest payable	91,885	94,796
Other liabilities (amounts related to VIEs of $104,663 and $150,131 at September 30, 2022 and December 31, 2021, respectively)	417,255	391,441
Total liabilities	15,326,635	14,322,462
Redeemable deferred stock units— 93,175 and 83,073 units outstanding at redemption value at September 30, 2022 and December 31, 2021, respectively	6,985	9,568
Equity / Capital:
Excess stock, $0.01 par value, 150,000,000 shares authorized, none issued or outstanding	0	0
Preferred stock, $0.01 par value, 50,000,000 shares authorized, none issued or outstanding	0	0
Common stock, $0.01 par value, 250,000,000 shares authorized, 156,833,612 and 156,623,749 issued and 156,754,712 and 156,544,849 outstanding at September 30, 2022 and December 31, 2021, respectively	1,568	1,565
Additional paid-in capital	6,532,299	6,497,730
Dividends in excess of earnings	(359,536)	(625,891)
Treasury common stock at cost, 78,900 shares at September 30, 2022 and December 31, 2021	(2,722)	(2,722)
Accumulated other comprehensive loss	(15,991)	(36,662)
Total stockholders' equity attributable to Boston Properties, Inc.	6,155,618	5,834,020
Noncontrolling interests:
Common units of the Operating Partnership	685,952	642,655
Property partnerships	1,551,501	1,556,553
Total equity / capital	8,393,071	8,033,228
Total liabilities and equity / capital	23,726,691	22,365,258
Boston Properties Limited Partnership
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,753,779 and $6,702,830 at September 30, 2022 and December 31, 2021, respectively)	24,824,862	23,379,243
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at September 30, 2022 and December 31, 2021, respectively)	237,505	237,507
Right of use assets - operating leases	167,935	169,778
Less: accumulated depreciation (amounts related to VIEs of $(1,352,781) and $(1,283,060) at September 30, 2022 and December 31, 2021, respectively)	(6,055,172)	(5,772,018)
Real estate and development in process, net	19,175,130	18,014,510
Cash and cash equivalents (amounts related to VIEs of $249,124 and $300,937 at September 30, 2022 and December 31, 2021, respectively)	375,774	452,692
Cash held in escrows	73,112	48,466
Investments in securities	30,040	43,632
Tenant and other receivables, net (amounts related to VIEs of $11,842 and $6,824 at September 30, 2022 and December 31, 2021, respectively)	69,633	70,186
Related party note receivable, net	78,592	78,336
Notes receivable, net	0	9,641
Accrued rental income, net (amounts related to VIEs of $359,439 and $357,395 at September 30, 2022 and December 31, 2021, respectively)	1,250,176	1,226,745
Deferred charges, net (amounts related to VIEs of $176,908 and $174,637 at September 30, 2022 and December 31, 2021, respectively)	720,648	618,798
Prepaid expenses and other assets (amounts related to VIEs of $44,525 and $29,668 at September 30, 2022 and December 31, 2021, respectively)	107,538	57,811
Investments in unconsolidated joint ventures	1,593,834	1,482,997
Total assets	23,474,477	22,103,814
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $3,271,157 and $3,267,914 at September 30, 2022 and December 31, 2021, respectively)	3,271,157	3,267,914
Unsecured senior notes, net	9,491,714	9,483,695
Unsecured line of credit	340,000	145,000
Unsecured term loan	730,000	0
Lease liabilities - finance leases (amounts related to VIEs of $20,568 and $20,458 at September 30, 2022 and December 31, 2021, respectively)	248,092	244,421
Lease liabilities - operating leases	205,008	204,561
Accounts payable and accrued expenses (amounts related to VIEs of $35,043 and $29,464 at September 30, 2022 and December 31, 2021, respectively)	360,572	320,775
Dividends and distributions payable	170,952	169,859
Accrued interest payable	91,885	94,796
Other liabilities (amounts related to VIEs of $104,663 and $150,131 at September 30, 2022 and December 31, 2021, respectively)	417,255	391,441
Total liabilities	15,326,635	14,322,462
Redeemable deferred stock units— 93,175 and 83,073 units outstanding at redemption value at September 30, 2022 and December 31, 2021, respectively	6,985	9,568
Noncontrolling interest:
Redeemable partnership units— 16,535,172 and 16,561,186 common units and 1,680,123 and 1,485,376 long term incentive units outstanding at redemption value at September 30, 2022 and December 31, 2021, respectively	1,407,762	2,078,603
Equity / Capital:
Boston Properties Limited Partnership partners’ capital— 1,749,700 and 1,745,914 general partner units and 155,005,012 and 154,798,935 limited partner units outstanding at September 30, 2022 and December 31, 2021, respectively	5,197,585	4,173,290
Accumulated other comprehensive loss	(15,991)	(36,662)
Total partners’ capital	5,181,594	4,136,628
Noncontrolling interests in property partnerships	1,551,501	1,556,553
Noncontrolling interests:
Total equity / capital	6,733,095	5,693,181
Total liabilities and equity / capital	$ 23,474,477	$ 22,103,814

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,753,779 and $6,702,830 at September 30, 2022 and December 31, 2021, respectively)	$ 25,192,376	$ 23,752,630
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at September 30, 2022 and December 31, 2021, respectively)	237,505	237,507
Less: accumulated depreciation (amounts related to VIEs of $(1,352,781) and $(1,283,060) at September 30, 2022 and December 31, 2021, respectively)	(6,170,472)	(5,883,961)
Cash and cash equivalents (amounts related to VIEs of $249,124 and $300,937 at September 30, 2022 and December 31, 2021, respectively)	375,774	452,692
Tenant and other receivables, net (amounts related to VIEs of $11,842 and $6,824 at September 30, 2022 and December 31, 2021, respectively)	69,633	70,186
Accrued rental income, net (amounts related to VIEs of $359,439 and $357,395 at September 30, 2022 and December 31, 2021, respectively)	1,250,176	1,226,745
Deferred charges, net (amounts related to VIEs of $176,908 and $174,637 at September 30, 2022 and December 31, 2021, respectively)	720,648	618,798
Prepaid expenses and other assets (amounts related to VIEs of $44,525 and $29,668 at September 30, 2022 and December 31, 2021, respectively)	107,538	57,811
Mortgage notes payable, net (amounts related to VIEs of $3,271,157 and $3,267,914 at September 30, 2022 and December 31, 2021, respectively)	3,271,157	3,267,914
Lease liabilities - finance leases (amounts related to VIEs of $20,568 and $20,458 at September 30, 2022 and December 31, 2021, respectively)	248,092	244,421
Accounts payable and accrued expenses (amounts related to VIEs of $35,043 and $29,464 at September 30, 2022 and December 31, 2021, respectively)	360,572	320,775
Other liabilities (amounts related to VIEs of $104,663 and $150,131 at September 30, 2022 and December 31, 2021, respectively)	$ 417,255	$ 391,441
Reedemable deferred stock units, units	93,175	83,073
Limited Partners' Capital Account, Units Outstanding (in units)	155,005,012
General Partners' Capital Account, Units Outstanding (in units)	1,749,700
Excess stock, par value	$ 0.01	$ 0.01
Excess stock, shares authorized	150,000,000	150,000,000
Excess stock, shares outstanding	0	0
Excess stock, shares issued	0	0
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	156,833,612	156,623,749
Common Stock, Shares, Outstanding	156,754,712	156,544,849
Treasury common stock at cost, shares	78,900	78,900
Boston Properties Limited Partnership
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,753,779 and $6,702,830 at September 30, 2022 and December 31, 2021, respectively)	$ 24,824,862	$ 23,379,243
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at September 30, 2022 and December 31, 2021, respectively)	237,505	237,507
Less: accumulated depreciation (amounts related to VIEs of $(1,352,781) and $(1,283,060) at September 30, 2022 and December 31, 2021, respectively)	(6,055,172)	(5,772,018)
Cash and cash equivalents (amounts related to VIEs of $249,124 and $300,937 at September 30, 2022 and December 31, 2021, respectively)	375,774	452,692
Tenant and other receivables, net (amounts related to VIEs of $11,842 and $6,824 at September 30, 2022 and December 31, 2021, respectively)	69,633	70,186
Accrued rental income, net (amounts related to VIEs of $359,439 and $357,395 at September 30, 2022 and December 31, 2021, respectively)	1,250,176	1,226,745
Deferred charges, net (amounts related to VIEs of $176,908 and $174,637 at September 30, 2022 and December 31, 2021, respectively)	720,648	618,798
Prepaid expenses and other assets (amounts related to VIEs of $44,525 and $29,668 at September 30, 2022 and December 31, 2021, respectively)	107,538	57,811
Mortgage notes payable, net (amounts related to VIEs of $3,271,157 and $3,267,914 at September 30, 2022 and December 31, 2021, respectively)	3,271,157	3,267,914
Lease liabilities - finance leases (amounts related to VIEs of $20,568 and $20,458 at September 30, 2022 and December 31, 2021, respectively)	248,092	244,421
Accounts payable and accrued expenses (amounts related to VIEs of $35,043 and $29,464 at September 30, 2022 and December 31, 2021, respectively)	360,572	320,775
Other liabilities (amounts related to VIEs of $104,663 and $150,131 at September 30, 2022 and December 31, 2021, respectively)	$ 417,255	$ 391,441
Reedemable deferred stock units, units	93,175	83,073
Limited Partners' Capital Account, Units Outstanding (in units)	155,005,012	154,798,935
General Partners' Capital Account, Units Outstanding (in units)	1,749,700	1,745,914
NonControlling Interest Redeemable Partnership Units Common Units Shares Outstanding	16,535,172	16,561,186
NonControlling Interest Redeemable Partnership Units Common Units Long Term Incentive Units At Redemption Value Shares Outstanding	1,680,123	1,485,376
Variable Interest Entity, Primary Beneficiary [Member]
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,753,779 and $6,702,830 at September 30, 2022 and December 31, 2021, respectively)	$ 6,753,779	$ 6,702,830
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at September 30, 2022 and December 31, 2021, respectively)	21,000	21,000
Less: accumulated depreciation (amounts related to VIEs of $(1,352,781) and $(1,283,060) at September 30, 2022 and December 31, 2021, respectively)	(1,352,781)	(1,283,060)
Cash and cash equivalents (amounts related to VIEs of $249,124 and $300,937 at September 30, 2022 and December 31, 2021, respectively)	249,124	300,937
Tenant and other receivables, net (amounts related to VIEs of $11,842 and $6,824 at September 30, 2022 and December 31, 2021, respectively)	11,842	6,824
Accrued rental income, net (amounts related to VIEs of $359,439 and $357,395 at September 30, 2022 and December 31, 2021, respectively)	359,439	357,395
Deferred charges, net (amounts related to VIEs of $176,908 and $174,637 at September 30, 2022 and December 31, 2021, respectively)	176,908	174,637
Prepaid expenses and other assets (amounts related to VIEs of $44,525 and $29,668 at September 30, 2022 and December 31, 2021, respectively)	44,525	29,668
Mortgage notes payable, net (amounts related to VIEs of $3,271,157 and $3,267,914 at September 30, 2022 and December 31, 2021, respectively)	3,271,157	3,267,914
Lease liabilities - finance leases (amounts related to VIEs of $20,568 and $20,458 at September 30, 2022 and December 31, 2021, respectively)	20,568	20,458
Accounts payable and accrued expenses (amounts related to VIEs of $35,043 and $29,464 at September 30, 2022 and December 31, 2021, respectively)	35,043	29,464
Other liabilities (amounts related to VIEs of $104,663 and $150,131 at September 30, 2022 and December 31, 2021, respectively)	104,663	150,131
Variable Interest Entity, Primary Beneficiary [Member] | Boston Properties Limited Partnership
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,753,779 and $6,702,830 at September 30, 2022 and December 31, 2021, respectively)	6,753,779	6,702,830
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at September 30, 2022 and December 31, 2021, respectively)	21,000	21,000
Less: accumulated depreciation (amounts related to VIEs of $(1,352,781) and $(1,283,060) at September 30, 2022 and December 31, 2021, respectively)	(1,352,781)	(1,283,060)
Cash and cash equivalents (amounts related to VIEs of $249,124 and $300,937 at September 30, 2022 and December 31, 2021, respectively)	249,124	300,937
Tenant and other receivables, net (amounts related to VIEs of $11,842 and $6,824 at September 30, 2022 and December 31, 2021, respectively)	11,842	6,824
Accrued rental income, net (amounts related to VIEs of $359,439 and $357,395 at September 30, 2022 and December 31, 2021, respectively)	359,439	357,395
Deferred charges, net (amounts related to VIEs of $176,908 and $174,637 at September 30, 2022 and December 31, 2021, respectively)	176,908	174,637
Prepaid expenses and other assets (amounts related to VIEs of $44,525 and $29,668 at September 30, 2022 and December 31, 2021, respectively)	44,525	29,668
Mortgage notes payable, net (amounts related to VIEs of $3,271,157 and $3,267,914 at September 30, 2022 and December 31, 2021, respectively)	3,271,157	3,267,914
Lease liabilities - finance leases (amounts related to VIEs of $20,568 and $20,458 at September 30, 2022 and December 31, 2021, respectively)	20,568	20,458
Accounts payable and accrued expenses (amounts related to VIEs of $35,043 and $29,464 at September 30, 2022 and December 31, 2021, respectively)	35,043	29,464
Other liabilities (amounts related to VIEs of $104,663 and $150,131 at September 30, 2022 and December 31, 2021, respectively)	$ 104,663	$ 150,131

XML

Consolidated Statements Of Operations - USD ($) shares in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue
Lease		$ 739,255,000	$ 692,260,000	$ 2,179,274,000	$ 2,062,102,000
Total revenue		790,523,000	730,056,000	2,318,757,000	2,157,558,000
Expenses
Rental		281,702,000	258,281,000	825,805,000	764,373,000
General and administrative		32,519,000	34,560,000	110,378,000	117,924,000
Transaction costs		1,650,000	1,888,000	2,146,000	2,970,000
Depreciation and amortization		190,675,000	179,412,000	551,445,000	539,815,000
Total expenses		518,994,000	481,093,000	1,520,810,000	1,442,241,000
Other income (expense)
Loss from Unconsolidated Joint Ventures		(3,524,000)	(5,597,000)	(1,389,000)	(1,745,000)
Gains on sales of real estate		262,345,000	348,000	381,293,000	8,104,000
Interest and other income (loss)		3,728,000	1,520,000	6,151,000	4,140,000
Other Income - assignment fee		0	0	6,624,000	0
Gains (losses) from investments in securities		(1,571,000)	(190,000)	(8,549,000)	3,744,000
Loss from early extinguishment of debt		0	0	0	(898,000)
Interest expense		(111,846,000)	(105,794,000)	(317,216,000)	(320,015,000)
Net income		420,661,000	139,250,000	864,861,000	408,647,000
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnerships		(18,801,000)	(18,971,000)	(54,896,000)	(52,602,000)
Noncontrolling interest - common units of the Operating Partnership		(40,883,000)	(11,982,000)	(82,821,000)	(35,393,000)
Net income attributable to the Company		360,977,000	108,297,000	727,144,000	320,652,000
Preferred dividends / distributions		0	0	0	(2,560,000)
Preferred Stock Redemption Charge		0	0	0	(6,412,000)
Net income attributable to the Company's common shareholders / unitholders		$ 360,977,000	$ 108,297,000	$ 727,144,000	$ 311,680,000
Basic earnings per common share / unit attributable to the Company
Earnings Per Share After Allocation of Undistributed Earnings to Participating Securities Basic (dollars per share)		$ 2.30	$ 0.69	$ 4.63	$ 2.00
Weighted average number of common shares / units outstanding (in shares / units)		156,754	156,183	156,708	156,062
Diluted earnings per common share / unit attributable to the Company
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit)		$ 2.29	$ 0.69	$ 4.62	$ 1.99
Weighted average number of common and common equivalent shares / units outstanding (in shares / units)		157,133	156,598	157,144	156,394
Boston Properties Limited Partnership
Revenue
Lease		$ 739,255,000	$ 692,260,000	$ 2,179,274,000	$ 2,062,102,000
Total revenue		790,523,000	730,056,000	2,318,757,000	2,157,558,000
Expenses
Rental		281,702,000	258,281,000	825,805,000	764,373,000
General and administrative		32,519,000	34,560,000	110,378,000	117,924,000
Transaction costs		1,650,000	1,888,000	2,146,000	2,970,000
Depreciation and amortization		188,969,000	177,677,000	546,271,000	533,255,000
Total expenses		517,288,000	479,358,000	1,515,636,000	1,435,681,000
Other income (expense)
Loss from Unconsolidated Joint Ventures		(3,524,000)	(5,597,000)	(1,389,000)	(1,745,000)
Gains on sales of real estate		262,357,000	348,000	385,349,000	8,104,000
Interest and other income (loss)		3,728,000	1,520,000	6,151,000	4,140,000
Other Income - assignment fee		0	0	6,624,000	0
Gains (losses) from investments in securities		(1,571,000)	(190,000)	(8,549,000)	3,744,000
Loss from early extinguishment of debt		0	0	0	(898,000)
Interest expense		(111,846,000)	(105,794,000)	(317,216,000)	(320,015,000)
Net income		422,379,000	140,985,000	874,091,000	415,207,000
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnerships		(18,801,000)	(18,971,000)	(54,896,000)	(52,602,000)
Net income attributable to the Company		403,578,000	122,014,000	819,195,000	362,605,000
Preferred dividends / distributions		0	0	0	(2,560,000)
Preferred Stock Redemption Charge		0	0	0	(6,412,000)
Net income attributable to the Company's common shareholders / unitholders		$ 403,578,000	$ 122,014,000	$ 819,195,000	$ 353,633,000
Basic earnings per common share / unit attributable to the Company
Earnings Per Share After Allocation of Undistributed Earnings to Participating Securities Basic (dollars per share)		$ 2.31	$ 0.70	$ 4.69	$ 2.04
Weighted average number of common shares / units outstanding (in shares / units)		174,416	173,194	174,339	173,078
Diluted earnings per common share / unit attributable to the Company
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit)		$ 2.30	$ 0.70	$ 4.68	$ 2.04
Weighted average number of common and common equivalent shares / units outstanding (in shares / units)		174,795	173,609	174,775	173,410
Parking and Other [Member]
Revenue
Other revenue		$ 28,154,000	$ 23,507,000	$ 80,234,000	$ 58,727,000
Parking and Other [Member] | Boston Properties Limited Partnership
Revenue
Other revenue		28,154,000	23,507,000	80,234,000	58,727,000
Hotel [Member]
Revenue
Other revenue	[1]	11,749,000	5,189,000	28,395,000	7,382,000
Expenses
Operating expense		8,548,000	3,946,000	19,832,000	7,993,000
Hotel [Member] | Boston Properties Limited Partnership
Revenue
Other revenue		11,749,000	5,189,000	28,395,000	7,382,000
Expenses
Operating expense		8,548,000	3,946,000	19,832,000	7,993,000
Real Estate, Other [Member]
Revenue
Other revenue		3,900,000	3,006,000	11,204,000	9,166,000
Expenses
Operating expense		3,900,000	3,006,000	11,204,000	9,166,000
Real Estate, Other [Member] | Boston Properties Limited Partnership
Revenue
Other revenue		3,900,000	3,006,000	11,204,000	9,166,000
Expenses
Operating expense		3,900,000	3,006,000	11,204,000	9,166,000
Management Service [Member]
Revenue
Other revenue		7,465,000	6,094,000	19,650,000	20,181,000
Management Service [Member] | Boston Properties Limited Partnership
Revenue
Other revenue		$ 7,465,000	$ 6,094,000	$ 19,650,000	$ 20,181,000

[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.

XML

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net income		$ 420,661	$ 139,250	$ 864,861	$ 408,647
Other comprehensive income :
Effective portion of interest rate contracts		10,800	1,088	18,400	5,482
Amortization of interest rate contracts	[1]	1,677	1,676	5,030	5,028
Other comprehensive income		12,477	2,764	23,430	10,510
Comprehensive Income		433,138	142,014	888,291	419,157
Net income attributable to noncontrolling interests		(59,684)	(30,953)	(137,717)	(87,995)
Other comprehensive income attributable to noncontrolling interests		(1,390)	(401)	(2,757)	(1,423)
Comprehensive income attributable to the Company		372,064	110,660	747,817	329,739
Boston Properties Limited Partnership
Net income		422,379	140,985	874,091	415,207
Other comprehensive income :
Effective portion of interest rate contracts		10,800	1,088	18,400	5,482
Amortization of interest rate contracts	[2]	1,677	1,676	5,030	5,028
Other comprehensive income		12,477	2,764	23,430	10,510
Comprehensive Income		434,856	143,749	897,521	425,717
Net income attributable to noncontrolling interests		(18,945)	(19,115)	(55,328)	(53,034)
Comprehensive income attributable to the Company		$ 415,911	$ 124,634	$ 842,193	$ 372,683

[1] Amounts reclassified from comprehensive income primarily to interest expense within Boston Properties, Inc.’s Consolidated Statements of Operations

[2] Amounts reclassified from comprehensive income primarily to interest expense within Boston Properties Limited Partnership’s Consolidated Statements of Operations.

XML

Consolidated Statements Of Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Preferred Stock [Member]	Additional Paid-In Capital [Member]	Dividends In Excess Of Earnings [Member]	Treasury Stock, at cost [Member]	Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interests [Member]	Noncontrolling interest - property partnerships [Member]
Equity, shares at Dec. 31, 2020		155,719,000
Equity, value at Dec. 31, 2020	$ 8,339,612	$ 1,557	$ 200,000	$ 6,356,791	$ (509,653)	$ (2,722)	$ (49,890)	$ 616,596	$ 1,726,933
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemption of operating partnership units to common stock, shares		227,000
Redemption of operating partnership units to common stock, value	0	$ 2		8,031				(8,033)
Allocated net income for the period	408,647				320,652			35,393	52,602
Dividends declared	(513,351)				(461,608)			(51,743)
Shares issued pursuant to stock purchase plan, shares		9,000
Shares issued pursuant to stock purchase plan, value	1,004			1,004
Net activity from stock option and incentive plan, shares		251,000
Net activity from stock option and incentive plan, value	60,228	$ 3		20,893				39,332
Preferred Stock, Redeemed	(193,623)		(200,000)	6,377
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	5,482						4,943	539
Amortization of interest rate contracts	5,028						4,144	452	432
Reallocation of noncontrolling interest	$ 0			22,706				(22,706)
Equity, shares at Sep. 30, 2021	156,206,000	156,206,000
Equity, value at Sep. 30, 2021	$ 8,054,749	$ 1,562	0	6,415,802	(657,021)	(2,722)	(40,803)	609,830	1,728,101
Equity, shares at Jun. 30, 2021		156,136,000
Equity, value at Jun. 30, 2021	8,089,993	$ 1,561		6,405,916	(612,247)	(2,722)	(43,166)	615,308	1,725,343
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemption of operating partnership units to common stock, shares		50,000
Redemption of operating partnership units to common stock, value	0	$ 1		1,747				(1,748)
Allocated net income for the period	139,250				108,308			11,971	18,971
Dividends declared	(170,285)				(153,082)			(17,203)
Shares issued pursuant to stock purchase plan, shares		4,000
Shares issued pursuant to stock purchase plan, value	520			520
Net activity from stock option and incentive plan, shares		16,000
Net activity from stock option and incentive plan, value	8,864	$ 0		1,185				7,679
Preferred Stock Redemption Charge	0
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	1,088						981	107
Amortization of interest rate contracts	1,676						1,382	150	144
Reallocation of noncontrolling interest	$ 0			6,434				(6,434)
Equity, shares at Sep. 30, 2021	156,206,000	156,206,000
Equity, value at Sep. 30, 2021	$ 8,054,749	$ 1,562	0	6,415,802	(657,021)	(2,722)	(40,803)	609,830	1,728,101
Equity, shares at Dec. 31, 2021	156,544,849	156,545,000
Equity, value at Dec. 31, 2021	$ 8,033,228	$ 1,565	0	6,497,730	(625,891)	(2,722)	(36,662)	642,655	1,556,553
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemption of operating partnership units to common stock, shares		178,000
Redemption of operating partnership units to common stock, value	0	$ 3		6,385				(6,388)
Allocated net income for the period	864,861				727,144			82,821	54,896
Dividends declared	(514,578)				(460,789)			(53,789)
Shares issued pursuant to stock purchase plan, shares		10,000
Shares issued pursuant to stock purchase plan, value	1,036			1,036
Net activity from stock option and incentive plan, shares		22,000
Net activity from stock option and incentive plan, value	45,474			5,935				39,539
Preferred Stock Redemption Charge	0
Contributions from noncontrolling interests in property partnerships	849								849
Distributions to noncontrolling interests in property partnerships	(61,229)								(61,229)
Effective portion of interest rate contracts	18,400						16,540	1,860
Amortization of interest rate contracts	5,030						4,131	467	432
Reallocation of noncontrolling interest	$ 0			21,213				(21,213)
Equity, shares at Sep. 30, 2022	156,754,712	156,755,000
Equity, value at Sep. 30, 2022	$ 8,393,071	$ 1,568	0	6,532,299	(359,536)	(2,722)	(15,991)	685,952	1,551,501
Equity, shares at Jun. 30, 2022		156,726,000
Equity, value at Jun. 30, 2022	8,142,669	$ 1,567		6,524,997	(567,016)	(2,722)	(27,077)	660,214	1,552,706
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemption of operating partnership units to common stock, shares		26,000
Redemption of operating partnership units to common stock, value	0	$ 1		958				(959)
Allocated net income for the period	420,661				361,100			40,760	18,801
Dividends declared	(171,550)				(153,620)			(17,930)
Shares issued pursuant to stock purchase plan, shares		5,000
Shares issued pursuant to stock purchase plan, value	436			436
Net activity from stock option and incentive plan, shares		(2,000)
Net activity from stock option and incentive plan, value	8,528			1,648				6,880
Preferred Stock Redemption Charge	0
Contributions from noncontrolling interests in property partnerships	0								0
Distributions to noncontrolling interests in property partnerships	(20,150)								(20,150)
Effective portion of interest rate contracts	10,800						9,709	1,091
Amortization of interest rate contracts	1,677						1,377	156	144
Reallocation of noncontrolling interest	$ 0			4,260				(4,260)
Equity, shares at Sep. 30, 2022	156,754,712	156,755,000
Equity, value at Sep. 30, 2022	$ 8,393,071	$ 1,568	$ 0	$ 6,532,299	$ (359,536)	$ (2,722)	$ (15,991)	$ 685,952	$ 1,551,501

XML

Consolidated Statement of Capital and Noncontrolling Interests - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Common Stock, Shares, Outstanding	156,754,712	156,206,000	156,754,712	156,206,000		156,544,849
Net activity from stock option and incentive plan, value	$ 8,528	$ 8,864	$ 45,474	$ 60,228
Preferred Stock Redemption Charge	0	0	0	(6,412)
Effective portion of interest rate contracts	10,800	1,088	18,400	5,482
Amortization of interest rate contracts	1,677	1,676	5,030	5,028
Contributions from noncontrolling interests in property partnerships	0	11,318	849	13,738
Distributions to noncontrolling interests in property partnerships	$ (20,150)	$ (27,675)	$ (61,229)	$ (65,604)
General Partner [Member]
Common Stock, Shares, Outstanding	1,750,000	1,737,000	1,750,000	1,737,000	1,750,000	1,746,000	1,737,000	1,731,000
Net activity from contributions and unearned compensation	0		1,000	4,000
Conversion of redeemable partnership units			3,000	2,000
Limited Partner [Member]
Common Stock, Shares, Outstanding	155,005,000	154,470,000	155,005,000	154,470,000	154,977,000	154,799,000	154,399,000	153,988,000
Net activity from contributions and unearned compensation	2,000	21,000	31,000	255,000
Conversion of redeemable partnership units	26,000	50,000	175,000	227,000
Partners' Capital (General and Limited Partners)[Member]
Beginning Balance	$ 5,197,585	$ 4,209,117	$ 5,197,585	$ 4,209,117	$ 4,716,430	$ 4,173,290	$ 4,132,880	$ 4,554,639
Net activity from contributions and unearned compensation, value	2,082	1,705	6,967	21,900
Allocated net income for the period	362,818	110,043	736,374	324,652
Distributions	(153,620)	(153,082)	(460,789)	(459,048)
Preferred Stock Redemption Charge				(6,412)
Conversion of redeemable partnership units, value	959	1,748	6,388	8,033
Adjustment to reflect redeemable partnership units at redemption value	268,916	115,823	735,355	(234,647)
Preferred Units [Member]
Beginning Balance								193,623
Allocated net income for the period				2,560
Distributions				(2,560)
Preferred Units [Member] | Boston Properties Limited Partnership
Beginning Balance		0		0
Preferred Stock, Redemption Amount		(193,623)		(193,623)
Accumulated Other Comprehensive Loss [Member]
Beginning Balance	(15,991)	(40,803)	(15,991)	(40,803)	(27,077)	(36,662)	(43,166)	(49,890)
Effective portion of interest rate contracts	9,709	981	16,540	4,943
Amortization of interest rate contracts	1,377	1,382	4,131	4,144
Noncontrolling interest - property partnerships [Member]
Beginning Balance	1,551,501	1,728,101	1,551,501	1,728,101	1,552,706	1,556,553	1,725,343	1,726,933
Allocated net income for the period	18,801	18,971	54,896	52,602
Amortization of interest rate contracts	144	144	432	432
Contributions from noncontrolling interests in property partnerships	0	11,318	849	13,738
Distributions to noncontrolling interests in property partnerships	(20,150)	(27,675)	(61,229)	(65,604)
Total Capital [Member]
Beginning Balance	6,733,095	5,896,415	6,733,095	5,896,415	6,242,059	5,693,181	5,815,057	6,425,305
Net activity from contributions and unearned compensation, value	2,082	1,705	6,967	21,900
Allocated net income for the period	381,619	129,014	791,270	379,814
Distributions	(153,620)	(153,082)	(460,789)	(461,608)
Preferred Stock, Redemption Amount		(193,623)		(193,623)
Preferred Stock Redemption Charge				(6,412)
Conversion of redeemable partnership units, value	959	1,748	6,388	8,033
Adjustment to reflect redeemable partnership units at redemption value	268,916	115,823	735,355	(234,647)
Effective portion of interest rate contracts	9,709	981	16,540	4,943
Amortization of interest rate contracts	1,521	1,526	4,563	4,576
Contributions from noncontrolling interests in property partnerships		11,318	849	13,738
Distributions to noncontrolling interests in property partnerships	(20,150)	(27,675)	(61,229)	(65,604)
Noncontrolling interest - Redeemable partnership units [Member]
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount	1,407,762	1,893,611	1,407,762	1,893,611	$ 1,646,678	$ 2,078,603	$ 2,008,478	$ 1,643,024
Net activity from contributions and unearned compensation, value	6,882	7,679	39,543	39,332
Allocated net income for the period	40,760	11,971	82,821	35,393
Distributions	(17,930)	(17,203)	(53,789)	(51,743)
Conversion of redeemable partnership units, value	(959)	(1,748)	(6,388)	(8,033)
Adjustment to reflect redeemable partnership units at redemption value	(268,916)	(115,823)	(735,355)	234,647
Effective portion of interest rate contracts	1,091	107	1,860	539
Amortization of interest rate contracts	$ 156	$ 150	$ 467	$ 452

XML

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Net income	$ 864,861	$ 408,647
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	551,445	539,815
Amortization of right of use assets - operating leases	1,843	3,208
Non-cash compensation expense	44,208	43,098
Loss from unconsolidated joint ventures	1,389	1,745
Distributions of net cash flow from operations of unconsolidated joint ventures	20,511	18,462
Losses (gains) from investments in securities	8,549	(3,744)
Allowance for current expected credit losses	(476)	(758)
Non-cash portion of interest expense	19,704	17,584
Settlement of accreted debt discount on redemption of unsecured senior notes	0	(6,290)
Loss from early extinguishment of debt	0	898
Other Income - assignment fee	(6,624)	0
Gains on sales of real estate	(381,293)	(8,104)
Change in assets and liabilities:
Tenant and other receivables, net	4,133	13,738
Notes receivable, net	(152)	(419)
Accrued rental income, net	(76,268)	(74,283)
Prepaid expenses and other assets	(46,104)	(61,019)
Operating Lease, Payments	447	(24,023)
Accounts payable and accrued expenses	3,167	26,097
Accrued interest payable	(2,900)	(18,237)
Other liabilities	(35,490)	(51,938)
Tenant leasing costs	(58,547)	(37,618)
Total adjustments	47,542	378,212
Net cash provided by operating activities	912,403	786,859
Cash flows from investing activities:
Acquisitions of real estate	(1,320,273)	(218,679)
Construction in progress	(384,083)	(381,104)
Building and other capital improvements	(112,755)	(103,840)
Tenant improvements	(139,986)	(218,878)
Proceeds from sales of real estate	695,231	0
Proceeds from assignment fee	6,624	0
Capital contributions to unconsolidated joint ventures	(109,643)	(95,462)
Capital distributions from unconsolidated joint ventures	36,622	122
Proceeds from note receivable	10,000	0
Proceeds from sale of investment in unconsolidated joint venture	0	17,789
Investments in securities, net	5,043	1,684
Net cash used in investing activities	(1,313,220)	(998,368)
Cash flows from financing activities:
Repayments of mortgage notes payable	0	(13,261)
Proceeds from unsecured senior notes	0	1,695,996
Redemption of unsecured senior notes	0	(843,710)
Borrowings on unsecured line of credit	885,000	300,000
Repayments of unsecured line of credit	(690,000)	(300,000)
Borrowings on unsecured term loan	730,000	0
Repayments of unsecured term loan	0	(500,000)
Redemption of preferred stock	0	(200,000)
Payments on finance lease obligations	0	1,250
Deferred financing costs	(2,230)	(20,770)
Debt prepayment and extinguishment costs	0	(185)
Net activity from equity transactions	(359)	20,028
Dividends and distributions	(513,486)	(513,381)
Contributions from noncontrolling interests in property partnerships	849	13,738
Distributions to noncontrolling interests in property partnerships	(61,229)	(65,604)
Net cash provided by (used in) financing activities	348,545	(425,899)
Net increase (decrease) in cash and cash equivalents and cash held in escrows	(52,272)	(637,408)
Cash and cash equivalents and cash held in escrows, beginning of period	501,158	1,719,329
Cash and cash equivalents and cash held in escrows, end of period	448,886	1,081,921
Reconciliation of cash and cash equivalents and cash held in escrow
Cash and cash equivalents, beginning of period	452,692	1,668,742
Cash held in escrows, beginning of period	48,466	50,587
Cash and cash equivalents, end of period	375,774	1,002,728
Cash held in escrows,end of period	73,112	79,193
Supplemental disclosures:
Cash paid for interest	339,067	358,015
Interest capitalized	40,048	36,632
Non-cash investing and financing activities:
Write-off of fully depreciated real estate	(95,996)	(159,108)
Change in real estate included in accounts payable and accrued expenses	29,290	(22,104)
Construction in progress, net deconsolidated	(11,316)	0
Transfer to Investments	11,316	0
Right-of-use assets obtained in exchange for operating lease liabilities	0	26,887
Dividends and distributions declared but not paid	170,952	169,739
Conversions of noncontrolling interests to stockholders’ equity	6,388	8,033
Issuance of restricted securities to employees and non-employee directors	48,605	44,257
Boston Properties Limited Partnership
Net income	874,091	415,207
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	546,271	533,255
Amortization of right of use assets - operating leases	1,843	3,208
Non-cash compensation expense	44,208	43,098
Loss from unconsolidated joint ventures	1,389	1,745
Distributions of net cash flow from operations of unconsolidated joint ventures	20,511	18,462
Losses (gains) from investments in securities	8,549	(3,744)
Allowance for current expected credit losses	(476)	(758)
Non-cash portion of interest expense	19,704	17,584
Settlement of accreted debt discount on redemption of unsecured senior notes	0	(6,290)
Loss from early extinguishment of debt	0	898
Other Income - assignment fee	(6,624)	0
Gains on sales of real estate	(385,349)	(8,104)
Change in assets and liabilities:
Tenant and other receivables, net	4,133	13,738
Notes receivable, net	(152)	(419)
Accrued rental income, net	(76,268)	(74,283)
Prepaid expenses and other assets	(46,104)	(61,019)
Operating Lease, Payments	447	(24,023)
Accounts payable and accrued expenses	3,167	26,097
Accrued interest payable	(2,900)	(18,237)
Other liabilities	(35,490)	(51,938)
Tenant leasing costs	(58,547)	(37,618)
Total adjustments	38,312	371,652
Net cash provided by operating activities	912,403	786,859
Cash flows from investing activities:
Acquisitions of real estate	(1,320,273)	(218,679)
Construction in progress	(384,083)	(381,104)
Building and other capital improvements	(112,755)	(103,840)
Tenant improvements	(139,986)	(218,878)
Proceeds from sales of real estate	695,231	0
Proceeds from assignment fee	6,624	0
Capital contributions to unconsolidated joint ventures	(109,643)	(95,462)
Capital distributions from unconsolidated joint ventures	36,622	122
Proceeds from note receivable	10,000	0
Proceeds from sale of investment in unconsolidated joint venture	0	17,789
Investments in securities, net	5,043	1,684
Net cash used in investing activities	(1,313,220)	(998,368)
Cash flows from financing activities:
Repayments of mortgage notes payable	0	(13,261)
Proceeds from unsecured senior notes	0	1,695,996
Redemption of unsecured senior notes	0	(843,710)
Borrowings on unsecured line of credit	885,000	300,000
Repayments of unsecured line of credit	(690,000)	(300,000)
Borrowings on unsecured term loan	730,000	0
Repayments of unsecured term loan	0	(500,000)
Redemption of preferred stock	0	(200,000)
Payments on finance lease obligations	0	1,250
Deferred financing costs	(2,230)	(20,770)
Debt prepayment and extinguishment costs	0	(185)
Net activity from equity transactions	(359)	20,028
Dividends and distributions	(513,486)	(513,381)
Contributions from noncontrolling interests in property partnerships	849	13,738
Distributions to noncontrolling interests in property partnerships	(61,229)	(65,604)
Net cash provided by (used in) financing activities	348,545	(425,899)
Net increase (decrease) in cash and cash equivalents and cash held in escrows	(52,272)	(637,408)
Cash and cash equivalents and cash held in escrows, beginning of period	501,158	1,719,329
Cash and cash equivalents and cash held in escrows, end of period	448,886	1,081,921
Reconciliation of cash and cash equivalents and cash held in escrow
Cash and cash equivalents, beginning of period	452,692	1,668,742
Cash held in escrows, beginning of period	48,466	50,587
Cash and cash equivalents, end of period	375,774	1,002,728
Cash held in escrows,end of period	73,112	79,193
Supplemental disclosures:
Cash paid for interest	339,067	358,015
Interest capitalized	40,048	36,632
Non-cash investing and financing activities:
Write-off of fully depreciated real estate	(95,996)	(157,794)
Change in real estate included in accounts payable and accrued expenses	29,290	(22,104)
Construction in progress, net deconsolidated	(11,316)	0
Transfer to Investments	11,316	0
Right-of-use assets obtained in exchange for operating lease liabilities	0	26,887
Dividends and distributions declared but not paid	170,952	169,739
Conversions of noncontrolling interests to stockholders’ equity	6,388	8,033
Issuance of restricted securities to employees and non-employee directors	$ 48,605	$ 44,257

XML

Organization

9 Months Ended

Sep. 30, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization

1. Organization

BXP is a fully integrated, self-administered and self-managed REIT. BXP is the sole general partner of BPLP, its operating partnership, and at September 30, 2022 owned an approximate 89.6% (89.7% at December 31, 2021) general and limited partnership interest in BPLP. Unless stated otherwise or the context requires, the “Company” refers to BXP and its subsidiaries, including BPLP and its consolidated subsidiaries. Partnership interests in BPLP include:

•common units of partnership interest (also referred to as “OP Units”) and

•long term incentive units of partnership interest (also referred to as “LTIP Units”).

Unless specifically noted otherwise, all references to OP Units exclude units held by BXP. A holder of an OP Unit may present the OP Unit to BPLP 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 one year from issuance). Upon presentation of an OP Unit for redemption, BPLP is obligated to redeem the OP Unit for cash equal to the value of a share of common stock of BXP (“Common Stock”). In lieu of such cash redemption, BXP may elect to acquire the OP Unit for one share of Common Stock. Because the number of shares of Common Stock outstanding at all times equals the number of OP Units that BXP owns, one share of Common Stock is generally the economic equivalent of one 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 time-based, restricted equity compensation and as a form of performance-based equity compensation for employees, and has previously granted LTIP Units in the form of (1) 2012 outperformance plan awards (“2012 OPP Units”) and (2) 2013 - 2022 multi-year, long-term incentive program awards (also referred to as “MYLTIP Units”), each of which, upon the satisfaction of certain performance-based and time-based vesting conditions, is convertible into one OP Unit. The three-year measurement periods for the 2012 OPP Units and the 2013 - 2019 MYLTIP Units have ended and BXP’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 2020 - 2022 MYLTIP Units differ from other LTIP Units granted to employees (including the 2012 OPP Units and the 2013 - 2019 MYLTIP Units, which have been earned). Therefore, unless specifically noted otherwise, all references to LTIP Units exclude the 2020 - 2022 MYLTIP Units. LTIP Units (including the earned 2012 OPP Units and the earned 2013 - 2019 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 and 12).

Properties

At September 30, 2022, the Company owned or had joint venture interests in a portfolio of 193 commercial real estate properties (the “Properties”) aggregating approximately 53.5 million net rentable square feet of primarily premier workplaces, including 14 properties under construction/redevelopment totaling approximately 4.4 million net rentable square feet. At September 30, 2022, the Properties consisted of:

•173 office properties (including 12 properties under construction/redevelopment);

•12 retail properties (including one property under redevelopment);

•seven residential properties (including one property under construction); and

•one hotel.

The Company considers premier workplaces to be well-located buildings that are modern structures or have been modernized to compete with newer buildings and professionally managed and maintained. As such, these properties attract high-quality clients and command upper-tier rental rates.

XML

Summary Of Significant Accounting Policies

9 Months Ended

Sep. 30, 2022

Accounting Policies [Abstract]

Basis Of Presentation And Summary Of Significant Accounting Policies

2. Basis of Presentation and Summary of Significant Accounting Policies

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 securities of BXP. 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 (the “SEC”). 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, 2021.

The Company bases its estimates on historical experience and on various other assumptions that it considers to be reasonable under the circumstances, including the impact of extraordinary events such as the coronavirus (“COVID-19”) pandemic, the results of which form the basis for making significant judgments about the carrying values of assets and liabilities, assessments of future collectability, and other areas of the 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 for 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 six of the seven entities that are VIEs.

Consolidated Variable Interest Entities

As of September 30, 2022, BXP has identified six consolidated VIEs, including BPLP. Excluding BPLP, the VIEs consisted of the following five in-service properties: 767 Fifth Avenue (the General Motors Building), Times Square Tower, 601 Lexington Avenue, Atlantic Wharf Office Building and 100 Federal Street.

The Company consolidates these VIEs because it is the primary beneficiary.  The third parties’ interests in these consolidated entities (excluding BPLP’s interest) are reflected as noncontrolling interests in property partnerships in the accompanying consolidated financial statements (See Note 8).

In addition, BXP’s only significant asset is its investment in BPLP and, consequently, substantially all of BXP’s assets and liabilities are the assets and liabilities of BPLP.

Variable Interest Entities Not Consolidated

The Company has determined that the Platform 16 Holdings LP joint venture is a VIE. The Company does not consolidate this entity as the Company does not have the power to direct the activities that, when taken together, most significantly impact the VIE’s performance and, therefore, the Company is not considered to be the primary beneficiary.

Fair 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 Standards Codification (“ASC”) 820 “Fair Value Measurements and Disclosures” (“ASC 820”)).

Financial Instrument	Level
Unsecured senior notes (1)	Level 1
Related party note receivable	Level 3
Notes receivable	Level 3
Mortgage notes payable	Level 3
Unsecured line of credit	Level 3
Unsecured term loan	Level 3

_______________

(1)If trading value for the period is low, the valuation could be categorized as Level 2.

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 those estimates.

The Company’s estimated fair values for these instruments as of the end of the applicable reporting period are not projections of, nor necessarily indicative of, estimated or actual fair values in future reporting periods.

The following table presents the aggregate carrying value of the Company’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 Company’s corresponding estimate of fair value as of September 30, 2022 and December 31, 2021 (in thousands):

	September 30, 2022				December 31, 2021
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Related party note receivable, net	$	78,592	$	79,614	$	78,336	$	82,867
Notes receivable, net	—		—		9,641		10,000
Total	$	78,592	$	79,614	$	87,977	$	92,867
Mortgage notes payable, net	$	3,271,157	$	2,788,779	$	3,267,914	$	3,395,569
Unsecured senior notes, net	9,491,714		8,261,816		9,483,695		9,966,591
Unsecured line of credit	340,000		338,247		145,000		145,317
Unsecured term loan, net	730,000		730,000		—		—
Total	$	13,832,871	$	12,118,842	$	12,896,609	$	13,507,477

XML

Real Estate

9 Months Ended

Sep. 30, 2022

Real Estate [Abstract]

Real Estate

3. Real Estate

BXP

Real estate consisted of the following at September 30, 2022 and December 31, 2021 (in thousands):

	September 30, 2022		December 31, 2021
Land	$	5,208,688	$	5,061,169
Right of use assets - finance leases	237,505		237,507
Right of use assets - operating leases	167,935		169,778
Land held for future development (1)	601,676		560,355
Buildings and improvements	15,598,033		14,291,214
Tenant improvements	3,061,686		2,894,025
Furniture, fixtures and equipment	52,126		51,695
Construction in progress	670,167		894,172
Total	25,597,816		24,159,915
Less: Accumulated depreciation	(6,170,472)		(5,883,961)
	$	19,427,344	$	18,275,954

_______________

(1)Includes pre-development costs.

BPLP

Real estate consisted of the following at September 30, 2022 and December 31, 2021 (in thousands):

	September 30, 2022		December 31, 2021
Land	$	5,113,979	$	4,964,986
Right of use assets - finance leases	237,505		237,507
Right of use assets - operating leases	167,935		169,778
Land held for future development (1)	601,676		560,355
Buildings and improvements	15,325,228		14,014,010
Tenant improvements	3,061,686		2,894,025
Furniture, fixtures and equipment	52,126		51,695
Construction in progress	670,167		894,172
Total	25,230,302		23,786,528
Less: Accumulated depreciation	(6,055,172)		(5,772,018)
	$	19,175,130	$	18,014,510

_______________

(1)Includes pre-development costs.

Acquisitions

On May 17, 2022, the Company completed the acquisition of Madison Centre in Seattle, Washington for a net purchase price, including transaction costs, of approximately $724.3 million. The acquisition was completed using the proceeds from BPLP’s $730.0 million unsecured term loan (See Note 6). Madison Centre is an approximately 755,000 net rentable square foot, 37-story, LEED-Platinum certified, premier workplace. The following table summarizes the allocation of the purchase price, including transaction costs, of Madison Centre at the date of acquisition (in thousands):

Land	$	104,641
Building and improvements	505,766
Tenant improvements	58,570
In-place lease intangibles	74,598
Above-market lease intangibles	3,794
Below-market lease intangibles	(23,114)
Net assets acquired	$	724,255

The following table summarizes the estimated annual amortization of the acquired in-place lease intangibles and the acquired above- and below-market lease intangibles for Madison Centre from May 17, 2022 through the remainder of 2022 and each of the five succeeding fiscal years (in thousands):

	Acquired In-Place Lease Intangibles		Acquired Above-Market Lease Intangibles		Acquired Below-Market Lease Intangibles
Period from May 17, 2022 through December 31, 2022	$	7,266	$	640	$	2,011
2023	12,200		1,098		3,442
2024	10,842		254		3,411
2025	10,770		254		3,398
2026	10,306		254		3,210
2027	9,161		254		2,805

Madison Centre contributed approximately $18.8 million of revenue and approximately $1.3 million of net income to the Company for the period from May 17, 2022 through September 30, 2022.

On September 16, 2022, the Company acquired 125 Broadway in Cambridge, Massachusetts for a net purchase price, including transaction costs, of approximately $592.4 million. The acquisition was completed with available cash and borrowings under BPLP’s unsecured credit facility. 125 Broadway is a 271,000 net rentable square foot, six-story, laboratory/life sciences property. The following table summarizes the allocation of the purchase price, including transaction costs, of 125 Broadway at the date of acquisition (in thousands):

Land	$	126,364
Building and improvements	403,588
Tenant improvements	30,074
In-place lease intangibles	49,137
Below-market lease intangibles	(16,725)
Net assets acquired	$	592,438

The following table summarizes the estimated annual amortization of the acquired in-place lease intangibles and the acquired below-market lease intangible for 125 Broadway from September 16, 2022 through the remainder of 2022 and each of the five succeeding fiscal years (in thousands):

	Acquired In-Place Lease Intangibles		Acquired Below-Market Lease Intangible
Period from September 16, 2022 through December 31, 2022	$	2,185	$	744
2023	8,740		2,975
2024	8,740		2,975
2025	8,740		2,975
2026	8,740		2,975
2027	8,740		2,975

125 Broadway contributed approximately $1.6 million of revenue and approximately $0.4 million of net income to the Company for the period from September 16, 2022 through September 30, 2022.

Dispositions

On March 31, 2022, the Company completed the sale of 195 West Street located in Waltham, Massachusetts for a gross sale price of $37.7 million. Net cash proceeds totaled approximately $35.4 million, resulting in a gain on sale of real estate totaling approximately $22.7 million for BXP and approximately $23.4 million for BPLP. 195 West Street is an approximately 63,500 net rentable square foot office property. 195 West Street contributed approximately $0.4 million of net income to the Company from January 1, 2022 through March 30, 2022 and contributed approximately $0.4 million and $0.2 million of net income to the Company for the three and nine months ended September 30, 2021, respectively.

On April 19, 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. On April 7, 2022, the Company executed an agreement to assign its right to acquire 11251 Roger Bacon Drive to a third party for an assignment fee of approximately $6.9 million. Net cash proceeds totaled approximately $6.6 million and is reflected as Other income - assignment fee in the Company's Consolidated Statements of Operations. 11251 Roger Bacon Drive is an approximately 65,000 square foot office building situated on approximately 2.6 acres. The property was 100% leased.

On June 15, 2022, the Company completed the sale of its suburban Virginia 95 Office Park properties located in Springfield, Virginia for an aggregate gross sale price of $127.5 million. Net cash proceeds totaled approximately $121.9 million, resulting in a gain on sale of real estate totaling approximately $96.2 million for BXP and approximately $99.5 million for BPLP. Virginia 95 Office Park consists of eleven office/flex properties aggregating approximately 733,000 net rentable square feet. Virginia 95 Office Park contributed approximately $2.3 million of net income to the Company from January 1, 2022 through June 14, 2022 and contributed approximately $1.8 million and $5.9 million of net income to the Company for the three and nine months ended September 30, 2021, respectively.

On August 30, 2022, the Company completed the sale of 601 Massachusetts Avenue located in Washington, DC for a gross sale price of $531.0 million. Net cash proceeds totaled approximately $512.3 million, resulting in a gain on sale of real estate of approximately $237.4 million for BXP and approximately $237.5 million for BPLP. 601 Massachusetts Avenue is an approximately 479,000 net rentable square foot premier workplace. 601 Massachusetts Avenue contributed approximately $3.6 million and $14.9 million of net income to the Company for the period from July 1, 2022 through August 29, 2022 and the period from January 1, 2022 through August 29, 2022, respectively, and contributed approximately $5.6 million and $16.7 million of net income to the Company for the three and nine months ended September 30, 2021, respectively.

On September 15, 2022, the Company completed the sale of two parcels of land located in Loudoun County, Virginia for an aggregate gross sale price of $27.0 million. Net cash proceeds totaled approximately $25.6 million, resulting in a gain on sale of real estate totaling approximately $24.4 million for BXP and BPLP.

Developments

On April 27, 2022, the Company entered into a 15-year lease agreement with AstraZeneca for approximately 570,000 net rentable square feet at the Company’s 290 Binney Street future development project. 290 Binney Street is part of the initial phase of a future life sciences development project located in the heart of Kendall Square in Cambridge, Massachusetts. The full project will consist of two buildings aggregating approximately 1.1 million rentable square feet of life sciences space and an approximately 400,000 square foot residential building. The lease and commencement of construction are subject to various conditions, some of which are not within the Company’s control. There can be no assurance that the conditions will be satisfied or that the Company will commence the development on the terms and schedule currently contemplated or at all.

On April 29, 2022, the Company partially placed in-service 2100 Pennsylvania Avenue, a premier workplace project with approximately 480,000 net rentable square feet located in Washington, DC.

On May 13, 2022, the Company commenced the development of Reston Next Office Phase II, a premier workplace project located in Reston, Virginia. When completed, the building will consist of approximately 90,000 net rentable square feet.

On June 29, 2022, the Company completed and fully placed in-service 325 Main Street, a premier workplace project with approximately 414,000 net rentable square feet located in Cambridge, Massachusetts.

On July 1, 2022, the Company commenced the redevelopment of 140 Kendrick Street, a premier workplace that consists of three buildings aggregating approximately 388,000 net rentable square feet located in Needham, Massachusetts. The redevelopment is a repositioning of one building consisting of approximately 90,000 net rentable square feet into a net zero, carbon neutral premier workplace building, as defined by the LEED Zero Carbon Certification. When completed, the building will consist of approximately 104,000 net rentable square feet.

On July 15, 2022, the Company partially placed in-service 880 Winter Street, an approximately 244,000 net rentable square foot laboratory/life sciences project located in Waltham, Massachusetts.

On September 8, 2022, the Company terminated its existing lease agreement with its client at 300 Binney Street to facilitate the conversion and expansion of the property. 300 Binney Street is a premier workplace with approximately 195,000 net rentable square feet at Kendall Center in Cambridge, Massachusetts that will be redeveloped into approximately 240,000 net rentable square feet of laboratory/life sciences space. The commencement of construction is subject to various conditions. There can be no assurance that the Company will commence the redevelopment on the terms and schedule currently contemplated or at all.

On September 12, 2022, the Company commenced the redevelopment of 760 Boylston Street, a retail project at the Prudential Center located in Boston, Massachusetts. The redevelopment is a modernization of the space consisting of approximately 118,000 net rentable square feet.

XML

Leases

9 Months Ended

Sep. 30, 2022

Leases [Abstract]

Leases of Lessor Disclosure [Text Block]

4. Leases

The Company estimates the collectability of its accrued rent and accounts receivable balances related to lease revenue. When evaluating the collectability of these accrued rent and accounts receivable balances, management considers client creditworthiness, current economic trends, including the impact of the COVID-19 pandemic on clients’ businesses, and changes in clients’ payment patterns, on a lease-by-lease basis.

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. The write-offs were for clients, 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.

During the nine months ended September 30, 2022, the Company determined it was probable of collecting substantially all of certain clients’ accrued rent and account receivable balances and, therefore, ceased recognizing revenue from such clients on a cash basis. As a result of returning these clients to accrual basis accounting, the Company reinstated approximately $1.5 million of accrued rent balances during the nine months ended September 30, 2022. There was no reinstatement of accrued rent balances during the three months ended September 30, 2022.

For information related to write-offs of accrued rent, net balances and accounts receivable, net balances and reinstatements of accrued rent balances for the Company’s unconsolidated joint ventures, see Note 5.

Lessor

The following table summarizes the components of lease revenue recognized during the three and nine months ended September 30, 2022 and 2021 included within the Company's Consolidated Statements of Operations (in thousands):

	Three months ended September 30,				Nine months ended September 30,
Lease Revenue	2022		2021		2022		2021
Fixed contractual payments	$	610,878	$	581,393	$	1,811,836	$	1,732,930
Variable lease payments	128,377		110,867		367,438		329,172
	$	739,255	$	692,260	$	2,179,274	$	2,062,102

XML

Investments in Unconsolidated Joint Ventures

9 Months Ended

Sep. 30, 2022

Investments In Unconsolidated Joint Ventures [Abstract]

Investments In Unconsolidated Joint Ventures

5. Investments in Unconsolidated Joint Ventures

The investments in unconsolidated joint ventures consist of the following at September 30, 2022 and December 31, 2021:

					Carrying Value of Investment (1)
Entity	Properties	Nominal % Ownership			September 30, 2022		December 31, 2021
					(in thousands)
Square 407 Limited Partnership	Market Square North	50.00	%		$	(5,759)	$	(1,205)
BP/CRF Metropolitan Square LLC	Metropolitan Square	20.00	%		(39,318)		(15,356)
901 New York, LLC	901 New York Avenue	25.00	%	(2)	(12,506)		(12,597)
WP Project Developer LLC	Wisconsin Place Land and Infrastructure	33.33	%	(3)	32,638		33,732
500 North Capitol Venture LLC	500 North Capitol Street, NW	30.00	%		(9,432)		(7,913)
501 K Street LLC	1001 6th Street	50.00	%	(4)	42,922		42,576
Podium Developer LLC	The Hub on Causeway - Podium	50.00	%		48,571		48,980
Residential Tower Developer LLC	Hub50House	50.00	%		45,662		47,774
Hotel Tower Developer LLC	The Hub on Causeway - Hotel Air Rights	50.00	%		12,165		11,505
Office Tower Developer LLC	100 Causeway Street	50.00	%		59,379		57,687
1265 Main Office JV LLC	1265 Main Street	50.00	%		3,358		3,541
BNY Tower Holdings LLC	Dock 72	50.00	%		26,947		27,343
BNYTA Amenity Operator LLC	Dock 72	50.00	%		825		1,069
CA-Colorado Center, LLC	Colorado Center	50.00	%		234,271		231,479
7750 Wisconsin Avenue LLC	7750 Wisconsin Avenue	50.00	%		52,656		61,626
BP-M 3HB Venture LLC	3 Hudson Boulevard	25.00	%		116,678		116,306
SMBP Venture LP	Santa Monica Business Park	55.00	%		166,302		156,639
Platform 16 Holdings LP	Platform 16	55.00	%	(5)	143,558		109,086
Gateway Portfolio Holdings LLC	Gateway Commons	50.00	%	(6)	314,137		327,148
Rosecrans-Sepulveda Partners 4, LLC	Beach Cities Media Campus	50.00	%		27,017		27,106
Safeco Plaza REIT LLC	Safeco Plaza	33.67	%	(7)	70,889		72,545
360 PAS Holdco LLC	360 Park Avenue South	42.21	%	(8)	112,772		106,855
PR II/BXP Reston Gateway LLC	Reston Next Residential	20.00	%	(9)	11,267		N/A
751 Gateway Holdings LLC	751 Gateway	49.00	%	(6)	71,820		N/A
					$	1,526,819	$	1,445,926

 _______________

(1)Investments with deficit balances aggregating approximately $67.0 million and $37.1 million at September 30, 2022 and December 31, 2021, respectively, 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, 2022 and December 31, 2021, 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.

(4)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 in excess of 520,000 square feet and achieving certain project returns at stabilization.

(5)This entity is a VIE (See Note 2).

(6)On June 16, 2022, in accordance with the Gateway Commons joint venture agreement, 751 Gateway was segregated into a new single-purpose joint venture.

(7)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 through which each partner owns its interest in the joint venture.

(8)The Company’s ownership includes (1) a 35.79% direct interest in the joint venture, (2) an additional 5.837% indirect ownership in the joint venture, and (3) an additional 1% interest in each of the two entities through which each partner owns its interest in the joint venture. The Company’s partners will fund required capital until their aggregate investment is

approximately 58% of all capital contributions; thereafter, the partners will fund required capital according to their percentage interests.

(9)The Company’s partner will fund required capital until its aggregate investment is approximately 80% of all capital contributions; thereafter, the partners will fund required capital according to their percentage interests.

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. 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.

The combined summarized balance sheets of the Company’s unconsolidated joint ventures are as follows: 

	September 30, 2022		December 31, 2021
	(in thousands)
ASSETS
Real estate and development in process, net (1)	$	5,858,271	$	5,579,218
Other assets	655,549		586,470
Total assets	$	6,513,820	$	6,165,688
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY
Mortgage and notes payable, net	$	3,425,972	$	3,214,961
Other liabilities (2)	681,228		652,135
Members’/Partners’ equity	2,406,620		2,298,592
Total liabilities and members’/partners’ equity	$	6,513,820	$	6,165,688
Company’s share of equity	$	1,180,507	$	1,104,175
Basis differentials (3)	346,312		341,751
Carrying value of the Company’s investments in unconsolidated joint ventures (4)	$	1,526,819	$	1,445,926

_______________

(1)At September 30, 2022 and December 31, 2021, this amount included right of use assets - finance leases totaling approximately $248.9 million. At September 30, 2022 and December 31, 2021, this amount included right of use assets - operating leases totaling approximately $21.4 million and $22.3 million, respectively.

(2)At September 30, 2022 and December 31, 2021, this amount included lease liabilities - finance leases totaling approximately $383.0 million and $385.5 million, respectively. At September 30, 2022 and December 31, 2021, this amount included lease liabilities - operating leases totaling approximately $30.5 million and $30.4 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, 2022		December 31, 2021
Property	(in thousands)
Colorado Center	$	302,539	$	304,776
Gateway Commons	51,188		51,009
Dock 72	(48,753)		(50,051)

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 $67.0 million and $37.1 million at September 30, 2022 and December 31, 2021, respectively, are 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,
	2022		2021		2022		2021
	(in thousands)
Total revenue (1)	$	127,996	$	90,009	$	373,358	$	268,501
Expenses
Operating	52,886		40,378		143,880		114,299
Transaction costs	(65)		—		746		7
Depreciation and amortization	44,132		36,036		132,089		103,766
Total expenses	96,953		76,414		276,715		218,072
Other income (expense)
Loss from early extinguishment of debt	—		—		(1,327)		—
Interest expense	(40,678)		(27,519)		(103,270)		(78,711)
Net loss	$	(9,635)	$	(13,924)	$	(7,954)	$	(28,282)
Company’s share of net income (loss)	$	(2,251)	$	(4,491)	$	2,225	$	(10,268)
Gain on sale of investment (2)	—		—		—		10,257
Basis differential (3)	(1,273)		(1,106)		(3,614)		(1,734)
Loss from unconsolidated joint ventures	$	(3,524)	$	(5,597)	$	(1,389)	$	(1,745)

_______________ 

(1)Includes straight-line rent adjustments of approximately $9.6 million and $5.5 million for the three months ended September 30, 2022 and 2021, respectively, and approximately $54.9 million and $11.6 million for the nine months ended September 30, 2022 and 2021, respectively. For the nine months ended September 30, 2022, reinstatement of accrued rent balances totaled approximately $2.5 million.

(2)During the nine months ended September 30, 2021, the Company completed 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 for each of the three months ended September 30, 2022 and 2021, and approximately $0.3 million and $0.7 million for the nine months ended September 30, 2022 and 2021, respectively. Also includes net above-/below-market rent adjustments of approximately $0.1 million for each of the three months ended September 30, 2022 and 2021, and approximately $0.3 million and $0.2 million for the nine months ended September 30, 2022 and 2021, respectively.

On January 18, 2022, a joint venture in which the Company has a 50% interest commenced the redevelopment of 651 Gateway located in South San Francisco, California. 651 Gateway is a premier workplace that is being converted to approximately 327,000 net rentable square feet of life sciences space.

On February 2, 2022, a joint venture in which the Company has a 55% interest commenced the development of the first phase of Platform 16, a premier workplace project located in San Jose, California, that is expected to contain approximately 1.1 million net rentable square feet upon completion. The first phase of the development projects includes the construction of an approximately 390,000 net rentable square foot premier workplace building and a below-grade parking garage.

On March 28, 2022, a joint venture in which the Company has a 20% interest refinanced with a new lender the debt secured by its Metropolitan Square property located in Washington, DC. At the time of the refinancing, the loan had an outstanding balance of approximately $294.1 million, bore interest at a variable rate equal to (1) the greater of (x) LIBOR or (y) 0.65%, plus (2) 4.75% per annum and was scheduled to mature on July 7, 2022, with two, one-year extension options, subject to certain conditions. There was no prepayment penalty associated with the prepayment of the previous mortgage loan. The joint venture recognized a loss from early extinguishment of debt totaling approximately $1.3 million due to the write-off of unamortized deferred financing costs. In conjunction with the refinancing, the joint venture settled its interest rate cap agreement, entered into in 2020, to limit its exposure to increases in the LIBOR rate. The new mortgage and mezzanine loans have an aggregate principal balance of $420.0 million, bear interest at a weighted average variable rate equal to the Secured Overnight Financing Rate (“SOFR“) plus 2.75% per annum and mature on April 9, 2024, with three, one-year extension options, subject to certain conditions. The joint venture distributed excess loan proceeds from the new mortgage and mezzanine loans

totaling approximately $100.5 million, of which the Company’s share totaled approximately $20.1 million. On September 1, 2022, the joint venture entered into an interest rate cap agreement that capped SOFR at 4.50% per annum on a notional amount of $420.0 million through April 15, 2024. Metropolitan Square is a premier workplace with approximately 657,000 net rentable square feet located in Washington, DC.

On April 18, 2022, a joint venture in which the Company has a 50% ownership interest extended the maturity date of the construction loan collateralized by its Hub50House property to June 19, 2022. At the time of the extension, the outstanding balance of the loan totaled approximately $176.5 million, bore interest at a variable rate equal to LIBOR plus 2.00% per annum and was scheduled to mature on April 19, 2022. On June 17, 2022, the joint venture repaid the existing construction loan and obtained a new mortgage loan. The new mortgage loan has a principal balance of $185.0 million, bears interest at a variable rate equal to SOFR plus 1.35% per annum and matures on June 17, 2032. At closing, the joint venture entered into interest rate swap contracts with notional amounts aggregating $185.0 million through April 10, 2032, resulting in a fixed rate of approximately 4.432% per annum through the expiration of the interest rate swap contracts. In conjunction with the new mortgage loan, the joint venture paid off the existing construction loan. At the time of the payoff of the construction loan, the outstanding balance of the loan totaled approximately $176.7 million. The joint venture distributed excess loan proceeds from the new mortgage loan totaling approximately $6.8 million, of which the Company’s share totaled approximately $3.4 million. Hub50House is a residential property that consists of approximately 320,000 net rentable square feet and 440 residential units located in Boston, Massachusetts.

On May 13, 2022, the Company entered into a joint venture with a third party to own, operate and develop Reston Next Residential located in Reston, Virginia. Reston Next Residential is expected to consist of 508 residential rental units upon completion. The Company contributed approximately $11.3 million of improvements at closing and will contribute cash totaling approximately $3.5 million in the future for its 20% ownership interest in the joint venture. The partner contributed approximately $0.5 million of cash at closing and will contribute cash totaling approximately $58.7 million in the future for its 80% ownership interest in the joint venture. As a result of the partner’s deferred contribution, as of the acquisition date, the Company owned an approximately 96% interest in the joint venture. On May 13, 2022, the joint venture commenced development and entered into a construction loan collateralized by the property. The construction loan has a principal amount of up to $140.0 million, bears interest at a variable rate equal to SOFR plus 2.00% per annum and matures on May 13, 2026, with two, one-year extension options, subject to certain conditions.

On June 16, 2022, the Company entered into a joint venture with a third party to own, operate and develop 751 Gateway, a laboratory building located in South San Francisco, California, that is expected to be approximately 231,000 net rentable square feet upon completion. 751 Gateway was previously part of the Company’s Gateway Commons joint venture. The Company contributed assets with an agreed upon value aggregating approximately $53.9 million and cash totaling approximately $2.6 million for its 49% ownership interest in the joint venture. The partner contributed assets with an agreed upon value aggregating approximately $53.9 million and cash totaling approximately $4.9 million for its 51% ownership interest in the joint venture.

On August 8, 2022, a joint venture in which the Company has a 50% interest modified the construction loan collateralized by its Dock 72 property located in Brooklyn, New York. At the time of the modification, the loan had an outstanding balance totaling approximately $198.4 million, a total commitment amount of $250.0 million, bore interest at a variable rate equal to LIBOR plus 3.35% per annum, and was scheduled to mature on December 18, 2023. The modified construction loan bears interest at a variable rate equal to (1) the greater of (x) SOFR or (y) 0.25% plus (2) 3.10% per annum, has a total commitment amount of approximately $198.4 million, and continues to mature on December 18, 2023. Dock 72 is a premier workplace with approximately 669,000 net rentable square feet.

On September 9, 2022, a joint venture in which the Company has an approximate 33.67% interest modified the mortgage loan collateralized by its Safeco Plaza property located in Seattle, Washington. At the time of the modification, the loan’s outstanding balance totaled $250.0 million, bore interest at a variable rate equal to the greater of (x) 2.35% or (y) LIBOR plus 2.20% per annum, and was scheduled to mature on September 1, 2026. The modified mortgage loan bears interest at a variable rate equal to the greater of (x) 2.35% or (y) SOFR plus 2.32% per annum and continues to mature on September 1, 2026. In conjunction with the loan modification, the joint venture entered into an interest rate cap agreement that capped SOFR at 2.50% per annum on a notional amount of $250.0 million through September 1, 2023. Safeco Plaza is a premier workplace with approximately 765,000 net rentable square feet.

XML

Unsecured Term Loan

9 Months Ended

Sep. 30, 2022

Debt Disclosure [Abstract]

Unsecured Term Loan

6. Unsecured Term Loan

On May 17, 2022, BPLP entered into an unsecured credit agreement (the “Unsecured Term Loan”) providing for a single borrowing of up to $730.0 million. The Unsecured Term Loan matures on May 16, 2023.

At BPLP’s option, the Unsecured Term Loan will bear interest at a rate per annum equal to (A) (1) a base rate per annum equal to the greater of (a) the federal funds rate plus 0.5%, (b) the administrative agent’s prime rate, (c) term SOFR plus 1.00% and (d) 1.00%, or (2) a term SOFR rate per annum equal to the forward-looking SOFR term rate administered by CME Group Benchmark Administration (“CME”) two business days prior to the commencement of such interest period; or if the rate is unavailable, then the forward-looking SOFR term rate administered by CME on the first business day immediately prior thereto, in each case, plus 0.10%, and (B) a margin ranging from zero to 160 basis points based on BPLP’s credit rating.

On May 17, 2022, BPLP exercised its option to draw $730.0 million under the Unsecured Term Loan (See Note 3). As of September 30, 2022, the Unsecured Term Loan bears interest at a variable rate equal to term SOFR plus 0.95% per annum based on BPLP’s credit rating at September 30, 2022. At September 30, 2022, BPLP had $730.0 million outstanding under the Unsecured Term Loan.

The Unsecured Term Loan 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 any outstanding amount under the Unsecured Term Loan. Among other covenants, the Unsecured Term Loan requires that BPLP 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. At September 30, 2022, BPLP was in compliance with each of these financial and other covenant requirements.

XML

Commitments And Contingencies

9 Months Ended

Sep. 30, 2022

Commitments and Contingencies Disclosure [Abstract]

Commitments And Contingencies

7. 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 clients 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 had letter of credit and performance obligations related to lender and development requirements that total approximately $26.5 million at September 30, 2022.

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. 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 may be entitled to an additional promoted interest or payments.

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, clients and other third parties for the completion of development projects. The Company has agreements with its outside or joint venture 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, 2022, the maximum funding obligation under the guarantee was approximately $14.9 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, 2022, no amounts related to the guarantee were recorded as liabilities in the Company’s consolidated financial statements.

In connection with the development of the 7750 Wisconsin Avenue office property located in Bethesda, Maryland, the Company entered into agreements with affiliates of The Bernstein Companies (the Company’s partner in the 7750 Wisconsin Avenue joint venture) under which the Company could be required to act as a mezzanine and/or mortgage lender and finance the construction of the hotel property being developed by an affiliate of The Bernstein Companies adjacent to the office property.   An affiliate of The Bernstein Companies exercised its option to borrow $10.0 million from the Company under such agreements, and the Company provided the financing on June 1, 2020. The financing bore interest at a fixed rate of 8.00% per annum, compounded monthly, and was scheduled to mature on the fifth anniversary of the date on which the base building of the affiliate of The Bernstein Companies’ hotel property was substantially completed. On June 27, 2022, the borrower repaid the loan in full, including approximately $1.6 million of accrued interest. The financing was recorded as Note Receivable, Net in the Company’s Consolidated Balance Sheets.

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. Each of the zoning ordinance and urban renewal plan was amended to decouple the residential requirement from the occupancy of the 325 Main Street property. 325 Main Street consisted of an approximately 115,000 net rentable square foot premier workplace that was demolished and redeveloped into an approximately 414,000 net rentable square foot premier workplace. While the amendment to the urban renewal plan is subject to completion of administrative processes, the City of Cambridge issued a temporary certificate of occupancy in the second quarter of 2022 (See Note 3).

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 $1.35 billion of property insurance in excess of the $1.0 billion of coverage in the Company’s property insurance program for 601 Lexington Avenue, New York, New York, consisting of $750 million of property and Terrorism Coverage in excess of the Company’s property insurance program and $600 million of Terrorism Coverage only in excess of the $1.75 billion of coverage. 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 the Federal Terrorism Risk Insurance Act (as amended, “TRIA”) (“NBCR Coverage”), which is provided by IXP as a direct insurer, for the properties in the 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.” The program trigger is $200 million, the coinsurance is 20% and the deductible is 20% of the premiums earned by the insurer for the year prior to 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 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.

The Company also currently carries earthquake insurance on its properties located in areas known to be subject to earthquakes. Specifically, the Company currently carries earthquake insurance which covers its San Francisco and Los Angeles regions with a $330 million per occurrence limit, and a $330 million annual aggregate limit, $30 million of which is provided 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. In addition, the Company currently carries earthquake insurance which covers its Seattle region with a $110 million per occurrence limit, and a $110 million annual aggregate limit. This insurance is subject to a deductible in the amount of 2% of the value of the 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.

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, BPLP has issued a guarantee to cover liabilities of IXP in the amount of $20.0 million.

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 pandemics, 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.

XML

Noncontrolling Interests

9 Months Ended

Sep. 30, 2022

Noncontrolling Interest [Abstract]

Noncontrolling Interests

8. Noncontrolling Interests

Noncontrolling interests relate to the interests in BPLP not owned by BXP and interests in consolidated property partnerships not wholly-owned by the Company. As of September 30, 2022, the noncontrolling interests in BPLP consisted of 16,535,172 OP Units, 1,680,123 LTIP Units (including 464,036 LTIP Units earned by employees under the Company’s multi-year long-term incentive awards granted between 2012 and 2019 (i.e., 2012 OPP and 2013 - 2019 MYLTIP awards)), 203,278 2020 MYLTIP Units, 351,218 2021 MYLTIP Units and 253,627 2022 MYLTIP Units held by parties other than BXP.

Noncontrolling Interest—Common Units

During the nine months ended September 30, 2022, 178,929 OP Units were presented by the holders for redemption (including an aggregate of 74,249 OP Units issued upon conversion of LTIP Units, 2012 OPP Units and MYLTIP Units) and were redeemed by BXP in exchange for an equal number of shares of Common Stock.

At September 30, 2022, BPLP had outstanding 203,278 2020 MYLTIP Units, 351,218 2021 MYLTIP Units and 253,627 2022 MYLTIP Units. Prior to the end of the respective three-year performance period for each plan, holders of MYLTIP Units are 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 three-year performance period for each plan has ended, (1) 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 and (2) with respect to the 2021 MYLTIP and 2022 MYLTIP only, the Company will make a “catch-up” cash payment on the MYLTIP Units that are ultimately earned in an amount equal to the regular and special dividends, if any, declared during the performance period on Common Stock, less the distributions actually paid during the performance period on all of the awarded 2021 MYLTIP Units and 2022 MYLTIP Units.

On February 4, 2022, the measurement period for the Company’s 2019 MYLTIP awards ended and, based on BXP’s relative TSR performance, the final payout was determined to be 69.0% of target, or an aggregate of approximately $8.6 million (after giving effect to employee separations). As a result, an aggregate of 144,043 2019 MYLTIP Units that had been previously granted were automatically forfeited.

The following table presents BPLP’s distributions on the OP Units and LTIP Units (including the 2012 OPP Units, 2013 - 2018 MYLTIP Units and, after the February 4, 2022 measurement date, the 2019 MYLTIP Units) and its distributions on the 2019 MYLTIP Units (prior to the February 4, 2022 measurement date) and 2020 - 2022 MYLTIP Units (after the February 1, 2022 issuance date of the 2022 MYLTIP Units) that occurred during the nine months ended September 30, 2022:

Record Date	Payment Date	Distributions per OP Unit and LTIP Unit	Distributions per MYLTIP Unit
September 30, 2022	October 31, 2022	$0.98	$0.098
June 30, 2022	July 29, 2022	$0.98	$0.098
March 31, 2022	April 29, 2022	$0.98	$0.098
December 31, 2021	January 28, 2022	$0.98	$0.098

The following table presents BPLP’s distributions on the OP Units and LTIP Units (including the 2012 OPP Units, 2013 - 2017 MYLTIP Units and, after the February 5, 2021 measurement date, the 2018 MYLTIP Units) and its distributions on the 2018 MYLTIP Units (prior to the February 5, 2021 measurement date) and 2019 - 2021 MYLTIP Units (after the February 2, 2021 issuance date of the 2021 MYLTIP Units) that occurred during the nine months ended September 30, 2021:

Record Date	Payment Date	Distributions per OP Unit and LTIP Unit	Distributions per MYLTIP Unit
September 30, 2021	October 29, 2021	$0.98	$0.098
June 30, 2021	July 30, 2021	$0.98	$0.098
March 31, 2021	April 30, 2021	$0.98	$0.098
December 31, 2020	January 28, 2021	$0.98	$0.098

A holder of an OP Unit may present the OP Unit to BPLP 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 one year from issuance). Upon presentation of an OP Unit for redemption, BPLP must redeem the OP Unit for cash equal to the then value of a share of Common Stock of BXP. BXP may, in its sole discretion, elect to assume and satisfy the redemption obligation by paying either cash or issuing one share of Common Stock. The value of the OP Units (other than OP Units owned by BXP), and LTIP Units (including the 2012 OPP Units and 2013 - 2019 MYLTIP Units), assuming in each case that all conditions had been met for the conversion thereof, had all of such units been redeemed at September 30, 2022 was approximately $1.4 billion based on the last reported price of a share of Common Stock on the New York Stock Exchange of $74.97 per share on September 30, 2022.

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 $1.6 billion at each of September 30, 2022 and December 31, 2021, are included in Noncontrolling Interests—Property Partnerships on the accompanying Consolidated Balance Sheets.

XML

Stockholders' Equity / Partners' Capital

9 Months Ended

Sep. 30, 2022

Equity [Abstract]

Stockholders' Equity / Partners' Capital

9. Stockholders’ Equity / Partners’ Capital

BXP

As of September 30, 2022, BXP had 156,754,712 shares of Common Stock outstanding.

As of September 30, 2022, BXP owned 1,749,700 general partnership units and 155,005,012 limited partnership units in BPLP.

On May 22, 2020, BXP 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 Stock through sales agents over a three-year period. Under the ATM stock offering program, BXP 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 replaced BXP’s prior

$600.0 million ATM stock offering program that was scheduled to expire on June 2, 2020. BXP 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 Stock have been issued under this ATM stock offering program.

During the nine months ended September 30, 2022, BXP did not issue any shares of Common Stock upon the exercise of options to purchase Common Stock.

During the nine months ended September 30, 2022, BXP issued 178,929 shares of Common Stock in connection with the redemption of an equal number of redeemable OP Units from limited partners.

The following table presents BXP’s dividends per share and BPLP’s distributions per OP Unit and LTIP Unit paid or declared in 2022 and during the nine months ended September 30, 2021:

Record Date	Payment Date	Dividend (Per Share)	Distribution (Per Unit)
September 30, 2022	October 31, 2022	$0.98	$0.98
June 30, 2022	July 29, 2022	$0.98	$0.98
March 31, 2022	April 29, 2022	$0.98	$0.98
December 31, 2021	January 28, 2022	$0.98	$0.98
September 30, 2021	October 29, 2021	$0.98	$0.98
June 30, 2021	July 30, 2021	$0.98	$0.98
March 31, 2021	April 30, 2021	$0.98	$0.98
December 31, 2020	January 28, 2021	$0.98	$0.98

Preferred Stock

On March 2, 2021, BXP issued a redemption notice for 80,000 shares of its 5.25% Series B Cumulative Redeemable Preferred Stock (the “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 redemption price per share of Series B Preferred Stock was $2,500, plus all accrued and unpaid dividends 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 Series B Preferred Stock, including accrued and unpaid dividends to, 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 and Series B Preferred Units of approximately $6.4 million relates to the original issuance costs and is reflected as a reduction to Net Income Attributable to Boston Properties, Inc. Common Shareholders and Net Income Attributable to Boston Properties Limited Partnership Common Unitholders on the Consolidated Income Statements.

On April 1, 2021, BXP redeemed 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, all of the Series B Preferred Units, which had terms and preferences generally mirroring those of the Series B Preferred Stock, were redeemed by BPLP.

The following table presents BXP’s dividend per share on its Series B Preferred Stock paid during the nine months ended September 30, 2021:

Record Date	Payment Date	Dividend (Per Share)
February 5, 2021	February 16, 2021	$32.8125

XML

Segment Information

9 Months Ended

Sep. 30, 2022

Segment Reporting [Abstract]

Segment Reporting Disclosure [Text Block]

10. Segment Information

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 months ended September 30, 2022 and 2021.

BXP

	Three months ended September 30,				Nine months ended September 30,
	2022		2021		2022		2021
	(in thousands)
Net income attributable to Boston Properties, Inc. common shareholders	$	360,977	$	108,297	$	727,144	$	311,680
Add:
Preferred stock redemption charge	—		—		—		6,412
Preferred dividends	—		—		—		2,560
Noncontrolling interest—common units of the Operating Partnership	40,883		11,982		82,821		35,393
Noncontrolling interests in property partnerships	18,801		18,971		54,896		52,602
Interest expense	111,846		105,794		317,216		320,015
Losses from early extinguishment of debt	—		—		—		898
Net operating income from unconsolidated joint ventures	35,316		24,266		108,347		74,478
Loss from unconsolidated joint ventures	3,524		5,597		1,389		1,745
Depreciation and amortization expense	190,675		179,412		551,445		539,815
Transaction costs	1,650		1,888		2,146		2,970
Payroll and related costs from management services contracts	3,900		3,006		11,204		9,166
General and administrative expense	32,519		34,560		110,378		117,924
Less:
Net operating income attributable to noncontrolling interests in property partnerships	48,306		47,800		143,223		138,463
Gains (losses) from investments in securities	(1,571)		(190)		(8,549)		3,744
Other income - assignment fee	—		—		6,624		—
Interest and other income (loss)	3,728		1,520		6,151		4,140
Gains on sales of real estate	262,345		348		381,293		8,104
Direct reimbursements of payroll and related costs from management services contracts	3,900		3,006		11,204		9,166
Development and management services revenue	7,465		6,094		19,650		20,181
Company’s share of Net Operating Income	$	475,918	$	435,195	$	1,407,390	$	1,291,860

BPLP

	Three months ended September 30,				Nine months ended September 30,
	2022		2021		2022		2021
	(in thousands)
Net income attributable to Boston Properties Limited Partnership common unitholders	$	403,578	$	122,014	$	819,195	$	353,633
Add:
Preferred unit redemption charge	—		—		—		6,412
Preferred distributions	—		—		—		2,560
Noncontrolling interests in property partnerships	18,801		18,971		54,896		52,602
Interest expense	111,846		105,794		317,216		320,015
Losses from early extinguishment of debt	—		—		—		898
Net operating income from unconsolidated joint ventures	35,316		24,266		108,347		74,478
Loss from unconsolidated joint ventures	3,524		5,597		1,389		1,745
Depreciation and amortization expense	188,969		177,677		546,271		533,255
Transaction costs	1,650		1,888		2,146		2,970
Payroll and related costs from management services contracts	3,900		3,006		11,204		9,166
General and administrative expense	32,519		34,560		110,378		117,924
Less:
Net operating income attributable to noncontrolling interests in property partnerships	48,306		47,800		143,223		138,463
Gains (losses) from investments in securities	(1,571)		(190)		(8,549)		3,744
Other income - assignment fee	—		—		6,624		—
Interest and other income (loss)	3,728		1,520		6,151		4,140
Gains on sales of real estate	262,357		348		385,349		8,104
Direct reimbursements of payroll and related costs from management services contracts	3,900		3,006		11,204		9,166
Development and management services revenue	7,465		6,094		19,650		20,181
Company’s share of Net Operating Income	$	475,918	$	435,195	$	1,407,390	$	1,291,860

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, other income - assignment fee, interest and other income (loss), gains 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 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), less 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 losses from early extinguishment of debt from unconsolidated joint ventures, 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 Income (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, other income - assignment fee, interest and other income (loss), gains 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 in a joint venture that acquired Safeco Plaza located in Seattle, Washington. 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.

Parking and other revenue for the three months ended September 30, 2022 increased by approximately $4.6 million compared to the three months ended September 30, 2021. Parking and other revenue for the nine months ended September 30, 2022 increased by approximately $21.5 million compared to 2021. These increases were primarily in transient and monthly parking revenue.

Information by geographic area and property type (dollars in thousands):

For the three months ended September 30, 2022:

	Boston			Los Angeles			New York			San Francisco			Seattle			Washington, DC			Total
Rental Revenue: (1)
Office	$	255,958		$	—		$	260,926		$	134,938		$	12,293		$	88,954		$	753,069
Residential	3,837			—			—			3,133			—			7,370			14,340
Hotel	11,749			—			—			—			—			—			11,749
Total	271,544			—			260,926			138,071			12,293			96,324			779,158
% of Grand Totals	34.85		%	—		%	33.49		%	17.72		%	1.58		%	12.36		%	100.00		%
Rental Expenses:
Office	91,226			—			99,942			47,068			3,125			33,317			274,678
Residential	1,552			—			—			2,125			—			3,347			7,024
Hotel	8,548			—			—			—			—			—			8,548
Total	101,326			—			99,942			49,193			3,125			36,664			290,250
% of Grand Totals	34.91		%	—		%	34.43		%	16.95		%	1.08		%	12.63		%	100.00		%
Net operating income	$	170,218		$	—		$	160,984		$	88,878		$	9,168		$	59,660		$	488,908
% of Grand Totals	34.81		%	—		%	32.93		%	18.18		%	1.88		%	12.20		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(11,293)			—			(37,013)			—			—			—			(48,306)
Add: Company’s share of net operating income (loss) from unconsolidated joint ventures	8,169			13,143			(259)			3,233			1,978			9,052			35,316
Company’s share of net operating income	$	167,094		$	13,143		$	123,712		$	92,111		$	11,146		$	68,712		$	475,918
% of Grand Totals	35.12		%	2.76		%	25.99		%	19.35		%	2.34		%	14.44		%	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.

For the three months ended September 30, 2021:

	Boston			Los Angeles			New York			San Francisco			Seattle			Washington, DC			Total
Rental Revenue: (1)
Office	$	236,080		$	—		$	257,656		$	125,340		$	—		$	85,797		$	704,873
Residential	3,418			—			—			806			—			6,670			10,894
Hotel	5,189			—			—			—			—			—			5,189
Total	244,687			—			257,656			126,146			—			92,467			720,956
% of Grand Totals	33.93		%	—		%	35.74		%	17.50		%	—		%	12.83		%	100.00		%
Rental Expenses:
Office	82,697			—			94,338			43,582			—			31,619			252,236
Residential	1,396			—			—			1,688			—			2,961			6,045
Hotel	3,946			—			—			—			—			—			3,946
Total	88,039			—			94,338			45,270			—			34,580			262,227
% of Grand Totals	33.57		%	—		%	35.98		%	17.26		%	—		%	13.19		%	100.00		%
Net operating income	$	156,648		$	—		$	163,318		$	80,876		$	—		$	57,887		$	458,729
% of Grand Totals	34.15		%	—		%	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 ventures	3,464			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 Totals	34.30		%	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.

Information by geographic area and property type (dollars in thousands):

For the nine months ended September 30, 2022:

	Boston			Los Angeles			New York			San Francisco			Seattle			Washington, DC			Total
Rental Revenue: (1)
Office	$	742,972		$	—		$	772,060		$	401,020		$	18,765		$	280,473		$	2,215,290
Residential	11,181			—			—			11,374			—			21,663			44,218
Hotel	28,395			—			—			—			—			—			28,395
Total	782,548			—			772,060			412,394			18,765			302,136			2,287,903
% of Grand Totals	34.20		%	—		%	33.75		%	18.02		%	0.82		%	13.21		%	100.00		%
Rental Expenses:
Office	268,781			—			291,645			135,677			4,805			101,623			802,531
Residential	4,481			—			—			9,138			—			9,655			23,274
Hotel	19,832			—			—			—			—			—			19,832
Total	293,094			—			291,645			144,815			4,805			111,278			845,637
% of Grand Totals	34.66		%	—		%	34.49		%	17.12		%	0.57		%	13.16		%	100.00		%
Net operating income	$	489,454		$	—		$	480,415		$	267,579		$	13,960		$	190,858		$	1,442,266
% of Grand Totals	33.94		%	—		%	33.31		%	18.55		%	0.97		%	13.23		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(34,405)			—			(108,818)			—			—			—			(143,223)
Add: Company’s share of net operating income (loss) from unconsolidated joint ventures	25,996			40,147			(397)			9,597			5,877			27,127			108,347
Company’s share of net operating income	$	481,045		$	40,147		$	371,200		$	277,176		$	19,837		$	217,985		$	1,407,390
% of Grand Totals	34.18		%	2.85		%	26.38		%	19.69		%	1.41		%	15.49		%	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.

For the nine months ended September 30, 2021:

	Boston			Los Angeles			New York			San Francisco			Seattle				Washington, DC			Total
Rental Revenue: (1)
Office	$	696,054		$	—		$	760,002		$	382,119		$	—			$	252,822		$	2,090,997
Residential	9,594			—			—			1,817			—				18,421			29,832
Hotel	7,382			—			—			—			—				—			7,382
Total	713,030			—			760,002			383,936			—				271,243			2,128,211
% of Grand Totals	33.50		%	—		%	35.71		%	18.04		%	—		%		12.75		%	100.00		%
Rental Expenses:
Office	240,743			—			286,385			124,785			—				94,360			746,273
Residential	4,286			—			—			4,918			—				8,896			18,100
Hotel	7,993			—			—			—			—				—			7,993
Total	253,022			—			286,385			129,703			—			—	103,256			772,366
% of Grand Totals	32.76		%	—		%	37.08		%	16.79		%	—		%		13.37		%	100.00		%
Net operating income	$	460,008		$	—		$	473,617		$	254,233		$	—			$	167,987		$	1,355,845
% of Grand Totals	33.93		%	—		%	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 (loss) from unconsolidated joint ventures	9,369			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 Totals	33.88		%	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.

XML

Earnings Per Share / Common Unit

9 Months Ended

Sep. 30, 2022

Earnings Per Share [Abstract]

Earnings Per Share / Common Unit

11. Earnings Per Share / Common Unit

BXP

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 BXP and BPLP’s LTIP Units, 2012 OPP Units and MYLTIP Units are considered participating securities. Participating securities are included in the computation of basic EPS of BXP using the two-class method. Participating securities are included in the computation of diluted EPS of BXP using the if-converted method if the impact is dilutive. Because the 2012 OPP Units and 2013 - 2019 MYLTIP Units required, and the 2020 - 2022 MYLTIP Units require, BXP to outperform absolute and/or relative return thresholds, unless such thresholds have been met by the end of the applicable reporting period, BXP excludes such units from the diluted EPS calculation. Other potentially dilutive common shares, including stock options, restricted stock and other securities of BPLP that are exchangeable for BXP’s Common Stock, and the related impact on earnings, are considered when calculating diluted EPS.

	Three months ended September 30, 2022
	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	$	360,977	156,754	$	2.30
Allocation of undistributed earnings to participating securities	(762)		—	—
Net income attributable to Boston Properties, Inc. common shareholders	360,215		156,754	2.30
Effect of Dilutive Securities:
Stock Based Compensation	—		379	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	360,215	157,133	$	2.29
	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

	Nine months ended September 30, 2022
	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	$	727,144	156,708	$	4.64
Allocation of undistributed earnings to participating securities	(1,002)		—	(0.01)
Net income attributable to Boston Properties, Inc. common shareholders	726,142		156,708	4.63
Effect of Dilutive Securities:
Stock Based Compensation	—		436	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	726,142	157,144	$	4.62

	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

BPLP

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 BXP and BPLP’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 - 2019 MYLTIP Units required, and the 2020 - 2022 MYLTIP Units require, BXP to outperform absolute and/or relative return thresholds, unless such thresholds have been met by the end of the applicable reporting period, BPLP 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 17,662,000 and 17,011,000 redeemable common units for the three months ended September 30, 2022 and 2021, respectively, and 17,631,000 and 17,016,000 redeemable common units for the nine months ended September 30, 2022 and 2021, respectively.

	Three months ended September 30, 2022
	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	$	403,578	174,416	$	2.31
Allocation of undistributed earnings to participating securities	(848)		—	—
Net income attributable to Boston Properties, Inc. common shareholders	402,730		174,416	2.31
Effect of Dilutive Securities:
Stock Based Compensation	—		379	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	402,730	174,795	$	2.30

	Three 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	$	122,014	173,194	$	0.70
Effect of Dilutive Securities:
Stock Based Compensation	—		415	—
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	122,014	173,609	$	0.70

	Nine months ended September 30, 2022
	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	$	819,195	174,339	$	4.70
Allocation of undistributed earnings to participating securities	(1,115)		—	(0.01)
Net income attributable to Boston Properties Limited Partnership common unitholders	$	818,080	174,339	$	4.69
Effect of Dilutive Securities:
Stock Based Compensation	—		436	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	818,080	174,775	$	4.68
	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

XML

Stock Option and Incentive Plan

9 Months Ended

Sep. 30, 2022

Share-Based Payment Arrangement [Abstract]

Stock Option and Incentive Plan

12. Stock Option and Incentive Plan

On February 1, 2022, BXP’s Compensation Committee approved the 2022 MYLTIP awards under the Boston Properties, Inc. 2021 Stock Incentive Plan (the “2021 Plan”) to certain officers and employees of BXP. The 2022 MYLTIP awards consist of two, equally weighted (50% each) components that utilize BXP’s TSR over a three-year measurement period as the performance metric.

The first component of the 2022 MYLTIP represents one-half (50%) of the target grant-date value of the award. 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 BXP’s three-year, annualized relative TSR performance compared to a custom index of peer companies. Under this component, 100% of the target number of LTIP Units will be earned if BXP’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%) of the target grant-date value of the 2022 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 BXP’s non-annualized, cumulative absolute TSR during the three-year performance period. Under this component, 100% of the target number of LTIP Units will be earned if BXP achieves an absolute TSR equal to +1,000 basis points; if BXP’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 2022 MYLTIP, if any, will equal the sum of the number of LTIP Units earned under the first and second components and will range from zero to a maximum of 254,061 LTIP Units with a target of approximately 127,031 LTIP Units and linear interpolation between zero and maximum. Earned awards (if any) will vest 100% on January 31, 2025, 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 BXP 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 January 31, 2025, earned awards will be calculated based on TSR performance up to the date of the change of control. The 2022 MYLTIP awards are in the form of LTIP Units issued on the grant date, and they are subject to forfeiture to the extent awards are not earned. Prior to the performance measurement date holders of the 2022 MYLTIP Units are only entitled to one-tenth (10%) of the regular quarterly distributions payable on common partnership units. Following the completion of the three-year performance period, the Company will also make a “catch-up” cash payment on the 2022 MYLTIP Units that are ultimately earned in an amount equal to the regular and special distributions, if any, declared during the performance period on BXP’s Common Stock, less the distributions actually paid to holders of 2022 MYLTIP Units during the performance period on all of the awarded 2022 MYLTIP Units. Under ASC 718 “Compensation - Stock Compensation,” the 2022 MYLTIP awards have an aggregate value of approximately $17.3 million, which amount will generally be amortized into earnings under the graded vesting method.

On February 4, 2022, the measurement period for the Company’s 2019 MYLTIP awards ended and, based on BXP’s relative TSR performance, the final payout was determined to be 69.0% of target, or an aggregate of approximately $8.6 million (after giving effect to employee separations). As a result, an aggregate of 144,043 2019 MYLTIP Units that had been previously granted were automatically forfeited.

During the nine months ended September 30, 2022, BXP issued 41,818 shares of restricted common stock and BPLP issued 280,616 LTIP Units and 254,061 2022 MYLTIP Units to employees and non-employee directors under the 2021 Plan. Employees and non-employee directors paid $0.01 per share of restricted common stock and $0.25 per LTIP Unit and 2022 MYLTIP Unit. When issued, LTIP 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 of BXP and BPLP. 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 BXP’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, 2022 were valued at approximately $4.7 million ($111.47 per share weighted-average). The LTIP Units granted were valued at approximately $29.9 million (approximately $106.46 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 1.71% and an expected price volatility of 31.0%. Because the 2012 OPP Units and 2013 - 2022 MYLTIP Units are subject to both a service condition and a market condition, the Company recognizes the related compensation expense 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. 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, LTIP Units and MYLTIP Units was approximately $7.7 million and $8.4 million for the three months

ended September 30, 2022 and 2021, respectively, and $43.2 million and $42.2 million for the nine months ended September 30, 2022 and 2021, respectively. At September 30, 2022, there was (1) an aggregate of approximately $25.9 million of unrecognized compensation expense related to unvested restricted stock, LTIP Units and 2019 MYLTIP Units and (2) an aggregate of approximately $7.3 million of unrecognized compensation expense related to unvested 2020 - 2022 MYLTIP Units that is expected to be recognized over a weighted-average period of approximately 2.0 years.

XML

Subsequent Events

9 Months Ended

Sep. 30, 2022

Subsequent Events [Abstract]

Subsequent Events

13. Subsequent Events

On October 6, 2022, the Company entered into an agreement to sell the residential component of The Avant at Reston Town Center, located in Reston, Virginia, for a gross sale price of $141 million. The Avant is a 15-story, approximately 329,000 square foot, excluding retail space, 359-unit, luxury multifamily building. The Company will retain ownership of the approximately 26,000 square foot ground-level retail space. There can be no assurance that the Company will complete the sale on the terms currently contemplated or at all.

On October 25, 2022, the Company entered into an agreement to acquire an approximate 27% interest in the joint venture that owns 200 Fifth Avenue located in New York City, for a gross purchase price of approximately $280.2 million, which includes $120.1 million of cash and the Company’s pro rata share of the outstanding loan secured by the property of $160.1 million. The mortgage loan bears interest at 4.34% per annum and matures in November 2028. 200 Fifth Avenue is a 14-story, approximately 870,000 square-foot, LEED Gold certified, premier workplace located in the Midtown South submarket. There can be no assurance that the Company will complete the acquisition on the terms currently contemplated or at all.

XML

Comprehensive Text Block List (Policies)	9 Months Ended
	Sep. 30, 2022
Accounting Policies [Abstract]
Basis of Presentation	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 securities of BXP. 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 (the “SEC”). 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, 2021.
Consolidation, Variable Interest Entity, Policy	Consolidated VIEs are those for 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.

XML

Summary Of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2022
Accounting Policies [Abstract]
Basis of Presentation	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 securities of BXP. 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 (the “SEC”). 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, 2021.
Use of Estimates in the Preparation of Financial Statements	The Company bases its estimates on historical experience and on various other assumptions that it considers to be reasonable under the circumstances, including the impact of extraordinary events such as the coronavirus (“COVID-19”) pandemic, the results of which form the basis for making significant judgments about the carrying values of assets and liabilities, assessments of future collectability, and other areas of the financial statements that are impacted by the use of estimates. Actual results may differ from these estimates under different assumptions or conditions.
Consolidation, Variable Interest Entity, Policy	Consolidated VIEs are those for 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.

XML

Summary Of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2022

Summary Of Significant Accounting Policies [Line Items]

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

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 Standards Codification (“ASC”) 820 “Fair Value Measurements and Disclosures” (“ASC 820”)).

Financial Instrument	Level
Unsecured senior notes (1)	Level 1
Related party note receivable	Level 3
Notes receivable	Level 3
Mortgage notes payable	Level 3
Unsecured line of credit	Level 3
Unsecured term loan	Level 3

_______________

(1)If trading value for the period is low, the valuation could be categorized as Level 2.

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 those estimates.

Fair Value, by Balance Sheet Grouping [Table Text Block]

The following table presents the aggregate carrying value of the Company’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 Company’s corresponding estimate of fair value as of September 30, 2022 and December 31, 2021 (in thousands):

	September 30, 2022				December 31, 2021
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Related party note receivable, net	$	78,592	$	79,614	$	78,336	$	82,867
Notes receivable, net	—		—		9,641		10,000
Total	$	78,592	$	79,614	$	87,977	$	92,867
Mortgage notes payable, net	$	3,271,157	$	2,788,779	$	3,267,914	$	3,395,569
Unsecured senior notes, net	9,491,714		8,261,816		9,483,695		9,966,591
Unsecured line of credit	340,000		338,247		145,000		145,317
Unsecured term loan, net	730,000		730,000		—		—
Total	$	13,832,871	$	12,118,842	$	12,896,609	$	13,507,477

XML

Real Estate (Tables)

9 Months Ended

Sep. 30, 2022

Real Estate Properties [Line Items]

Schedule of Real Estate Properties

BXP

Real estate consisted of the following at September 30, 2022 and December 31, 2021 (in thousands):

	September 30, 2022		December 31, 2021
Land	$	5,208,688	$	5,061,169
Right of use assets - finance leases	237,505		237,507
Right of use assets - operating leases	167,935		169,778
Land held for future development (1)	601,676		560,355
Buildings and improvements	15,598,033		14,291,214
Tenant improvements	3,061,686		2,894,025
Furniture, fixtures and equipment	52,126		51,695
Construction in progress	670,167		894,172
Total	25,597,816		24,159,915
Less: Accumulated depreciation	(6,170,472)		(5,883,961)
	$	19,427,344	$	18,275,954

_______________

(1)Includes pre-development costs.

Madison Centre

Real Estate Properties [Line Items]

Asset Acquisition [Table Text Block]

The following table summarizes the allocation of the purchase price, including transaction costs, of Madison Centre at the date of acquisition (in thousands):

Land	$	104,641
Building and improvements	505,766
Tenant improvements	58,570
In-place lease intangibles	74,598
Above-market lease intangibles	3,794
Below-market lease intangibles	(23,114)
Net assets acquired	$	724,255

Schedule of Finite-Lived Intangible Assets Acquired

The following table summarizes the estimated annual amortization of the acquired in-place lease intangibles and the acquired above- and below-market lease intangibles for Madison Centre from May 17, 2022 through the remainder of 2022 and each of the five succeeding fiscal years (in thousands):

	Acquired In-Place Lease Intangibles		Acquired Above-Market Lease Intangibles		Acquired Below-Market Lease Intangibles
Period from May 17, 2022 through December 31, 2022	$	7,266	$	640	$	2,011
2023	12,200		1,098		3,442
2024	10,842		254		3,411
2025	10,770		254		3,398
2026	10,306		254		3,210
2027	9,161		254		2,805

125 Broadway

Real Estate Properties [Line Items]

Asset Acquisition [Table Text Block]

The following table summarizes the allocation of the purchase price, including transaction costs, of 125 Broadway at the date of acquisition (in thousands):

Land	$	126,364
Building and improvements	403,588
Tenant improvements	30,074
In-place lease intangibles	49,137
Below-market lease intangibles	(16,725)
Net assets acquired	$	592,438

Schedule of Finite-Lived Intangible Assets Acquired

The following table summarizes the estimated annual amortization of the acquired in-place lease intangibles and the acquired below-market lease intangible for 125 Broadway from September 16, 2022 through the remainder of 2022 and each of the five succeeding fiscal years (in thousands):

	Acquired In-Place Lease Intangibles		Acquired Below-Market Lease Intangible
Period from September 16, 2022 through December 31, 2022	$	2,185	$	744
2023	8,740		2,975
2024	8,740		2,975
2025	8,740		2,975
2026	8,740		2,975
2027	8,740		2,975

Boston Properties Limited Partnership

Real Estate Properties [Line Items]

Schedule of Real Estate Properties

BPLP

Real estate consisted of the following at September 30, 2022 and December 31, 2021 (in thousands):

	September 30, 2022		December 31, 2021
Land	$	5,113,979	$	4,964,986
Right of use assets - finance leases	237,505		237,507
Right of use assets - operating leases	167,935		169,778
Land held for future development (1)	601,676		560,355
Buildings and improvements	15,325,228		14,014,010
Tenant improvements	3,061,686		2,894,025
Furniture, fixtures and equipment	52,126		51,695
Construction in progress	670,167		894,172
Total	25,230,302		23,786,528
Less: Accumulated depreciation	(6,055,172)		(5,772,018)
	$	19,175,130	$	18,014,510

_______________

(1)Includes pre-development costs.

XML

Leases (Tables)

9 Months Ended

Sep. 30, 2022

Lessor, Lease, Description [Line Items]

Operating Lease, Lease Income [Table Text Block]

The following table summarizes the components of lease revenue recognized during the three and nine months ended September 30, 2022 and 2021 included within the Company's Consolidated Statements of Operations (in thousands):

	Three months ended September 30,				Nine months ended September 30,
Lease Revenue	2022		2021		2022		2021
Fixed contractual payments	$	610,878	$	581,393	$	1,811,836	$	1,732,930
Variable lease payments	128,377		110,867		367,438		329,172
	$	739,255	$	692,260	$	2,179,274	$	2,062,102

XML

Investments in Unconsolidated Joint Ventures (Tables)

9 Months Ended

Sep. 30, 2022

Schedule of Equity Method Investments [Line Items]

Investments In Unconsolidated Joint Ventures

The investments in unconsolidated joint ventures consist of the following at September 30, 2022 and December 31, 2021:

					Carrying Value of Investment (1)
Entity	Properties	Nominal % Ownership			September 30, 2022		December 31, 2021
					(in thousands)
Square 407 Limited Partnership	Market Square North	50.00	%		$	(5,759)	$	(1,205)
BP/CRF Metropolitan Square LLC	Metropolitan Square	20.00	%		(39,318)		(15,356)
901 New York, LLC	901 New York Avenue	25.00	%	(2)	(12,506)		(12,597)
WP Project Developer LLC	Wisconsin Place Land and Infrastructure	33.33	%	(3)	32,638		33,732
500 North Capitol Venture LLC	500 North Capitol Street, NW	30.00	%		(9,432)		(7,913)
501 K Street LLC	1001 6th Street	50.00	%	(4)	42,922		42,576
Podium Developer LLC	The Hub on Causeway - Podium	50.00	%		48,571		48,980
Residential Tower Developer LLC	Hub50House	50.00	%		45,662		47,774
Hotel Tower Developer LLC	The Hub on Causeway - Hotel Air Rights	50.00	%		12,165		11,505
Office Tower Developer LLC	100 Causeway Street	50.00	%		59,379		57,687
1265 Main Office JV LLC	1265 Main Street	50.00	%		3,358		3,541
BNY Tower Holdings LLC	Dock 72	50.00	%		26,947		27,343
BNYTA Amenity Operator LLC	Dock 72	50.00	%		825		1,069
CA-Colorado Center, LLC	Colorado Center	50.00	%		234,271		231,479
7750 Wisconsin Avenue LLC	7750 Wisconsin Avenue	50.00	%		52,656		61,626
BP-M 3HB Venture LLC	3 Hudson Boulevard	25.00	%		116,678		116,306
SMBP Venture LP	Santa Monica Business Park	55.00	%		166,302		156,639
Platform 16 Holdings LP	Platform 16	55.00	%	(5)	143,558		109,086
Gateway Portfolio Holdings LLC	Gateway Commons	50.00	%	(6)	314,137		327,148
Rosecrans-Sepulveda Partners 4, LLC	Beach Cities Media Campus	50.00	%		27,017		27,106
Safeco Plaza REIT LLC	Safeco Plaza	33.67	%	(7)	70,889		72,545
360 PAS Holdco LLC	360 Park Avenue South	42.21	%	(8)	112,772		106,855
PR II/BXP Reston Gateway LLC	Reston Next Residential	20.00	%	(9)	11,267		N/A
751 Gateway Holdings LLC	751 Gateway	49.00	%	(6)	71,820		N/A
					$	1,526,819	$	1,445,926

 _______________

(1)Investments with deficit balances aggregating approximately $67.0 million and $37.1 million at September 30, 2022 and December 31, 2021, respectively, 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, 2022 and December 31, 2021, 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.

(4)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 in excess of 520,000 square feet and achieving certain project returns at stabilization.

(5)This entity is a VIE (See Note 2).

(6)On June 16, 2022, in accordance with the Gateway Commons joint venture agreement, 751 Gateway was segregated into a new single-purpose joint venture.

(7)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 through which each partner owns its interest in the joint venture.

(8)The Company’s ownership includes (1) a 35.79% direct interest in the joint venture, (2) an additional 5.837% indirect ownership in the joint venture, and (3) an additional 1% interest in each of the two entities through which each partner owns its interest in the joint venture. The Company’s partners will fund required capital until their aggregate investment is

approximately 58% of all capital contributions; thereafter, the partners will fund required capital according to their percentage interests.

(9)The Company’s partner will fund required capital until its aggregate investment is approximately 80% of all capital contributions; thereafter, the partners will fund required capital according to their percentage interests.

Schedule Of Balance Sheets Of The Unconsolidated Joint Ventures [Text Block]

The combined summarized balance sheets of the Company’s unconsolidated joint ventures are as follows: 

	September 30, 2022		December 31, 2021
	(in thousands)
ASSETS
Real estate and development in process, net (1)	$	5,858,271	$	5,579,218
Other assets	655,549		586,470
Total assets	$	6,513,820	$	6,165,688
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY
Mortgage and notes payable, net	$	3,425,972	$	3,214,961
Other liabilities (2)	681,228		652,135
Members’/Partners’ equity	2,406,620		2,298,592
Total liabilities and members’/partners’ equity	$	6,513,820	$	6,165,688
Company’s share of equity	$	1,180,507	$	1,104,175
Basis differentials (3)	346,312		341,751
Carrying value of the Company’s investments in unconsolidated joint ventures (4)	$	1,526,819	$	1,445,926

_______________

(1)At September 30, 2022 and December 31, 2021, this amount included right of use assets - finance leases totaling approximately $248.9 million. At September 30, 2022 and December 31, 2021, this amount included right of use assets - operating leases totaling approximately $21.4 million and $22.3 million, respectively.

(2)At September 30, 2022 and December 31, 2021, this amount included lease liabilities - finance leases totaling approximately $383.0 million and $385.5 million, respectively. At September 30, 2022 and December 31, 2021, this amount included lease liabilities - operating leases totaling approximately $30.5 million and $30.4 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, 2022		December 31, 2021
Property	(in thousands)
Colorado Center	$	302,539	$	304,776
Gateway Commons	51,188		51,009
Dock 72	(48,753)		(50,051)

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 $67.0 million and $37.1 million at September 30, 2022 and December 31, 2021, respectively, are reflected within Other Liabilities in the Company’s Consolidated Balance Sheets.

Statements Of Operations Of The Joint Ventures

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,
	2022		2021		2022		2021
	(in thousands)
Total revenue (1)	$	127,996	$	90,009	$	373,358	$	268,501
Expenses
Operating	52,886		40,378		143,880		114,299
Transaction costs	(65)		—		746		7
Depreciation and amortization	44,132		36,036		132,089		103,766
Total expenses	96,953		76,414		276,715		218,072
Other income (expense)
Loss from early extinguishment of debt	—		—		(1,327)		—
Interest expense	(40,678)		(27,519)		(103,270)		(78,711)
Net loss	$	(9,635)	$	(13,924)	$	(7,954)	$	(28,282)
Company’s share of net income (loss)	$	(2,251)	$	(4,491)	$	2,225	$	(10,268)
Gain on sale of investment (2)	—		—		—		10,257
Basis differential (3)	(1,273)		(1,106)		(3,614)		(1,734)
Loss from unconsolidated joint ventures	$	(3,524)	$	(5,597)	$	(1,389)	$	(1,745)

_______________ 

(1)Includes straight-line rent adjustments of approximately $9.6 million and $5.5 million for the three months ended September 30, 2022 and 2021, respectively, and approximately $54.9 million and $11.6 million for the nine months ended September 30, 2022 and 2021, respectively. For the nine months ended September 30, 2022, reinstatement of accrued rent balances totaled approximately $2.5 million.

(2)During the nine months ended September 30, 2021, the Company completed 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 for each of the three months ended September 30, 2022 and 2021, and approximately $0.3 million and $0.7 million for the nine months ended September 30, 2022 and 2021, respectively. Also includes net above-/below-market rent adjustments of approximately $0.1 million for each of the three months ended September 30, 2022 and 2021, and approximately $0.3 million and $0.2 million for the nine months ended September 30, 2022 and 2021, respectively.

XML

Noncontrolling Interests (Tables)

9 Months Ended

Sep. 30, 2022

Noncontrolling Interest [Line Items]

Distribution Declared to OP, LTIP, OPP and MYLTIP Units [Table Text Block]

The following table presents BXP’s dividends per share and BPLP’s distributions per OP Unit and LTIP Unit paid or declared in 2022 and during the nine months ended September 30, 2021:

Record Date	Payment Date	Dividend (Per Share)	Distribution (Per Unit)
September 30, 2022	October 31, 2022	$0.98	$0.98
June 30, 2022	July 29, 2022	$0.98	$0.98
March 31, 2022	April 29, 2022	$0.98	$0.98
December 31, 2021	January 28, 2022	$0.98	$0.98
September 30, 2021	October 29, 2021	$0.98	$0.98
June 30, 2021	July 30, 2021	$0.98	$0.98
March 31, 2021	April 30, 2021	$0.98	$0.98
December 31, 2020	January 28, 2021	$0.98	$0.98

Noncontrolling Interests [Member]

Noncontrolling Interest [Line Items]

Distribution Declared to OP, LTIP, OPP and MYLTIP Units [Table Text Block]

The following table presents BPLP’s distributions on the OP Units and LTIP Units (including the 2012 OPP Units, 2013 - 2018 MYLTIP Units and, after the February 4, 2022 measurement date, the 2019 MYLTIP Units) and its distributions on the 2019 MYLTIP Units (prior to the February 4, 2022 measurement date) and 2020 - 2022 MYLTIP Units (after the February 1, 2022 issuance date of the 2022 MYLTIP Units) that occurred during the nine months ended September 30, 2022:

Record Date	Payment Date	Distributions per OP Unit and LTIP Unit	Distributions per MYLTIP Unit
September 30, 2022	October 31, 2022	$0.98	$0.098
June 30, 2022	July 29, 2022	$0.98	$0.098
March 31, 2022	April 29, 2022	$0.98	$0.098
December 31, 2021	January 28, 2022	$0.98	$0.098

The following table presents BPLP’s distributions on the OP Units and LTIP Units (including the 2012 OPP Units, 2013 - 2017 MYLTIP Units and, after the February 5, 2021 measurement date, the 2018 MYLTIP Units) and its distributions on the 2018 MYLTIP Units (prior to the February 5, 2021 measurement date) and 2019 - 2021 MYLTIP Units (after the February 2, 2021 issuance date of the 2021 MYLTIP Units) that occurred during the nine months ended September 30, 2021:

Record Date	Payment Date	Distributions per OP Unit and LTIP Unit	Distributions per MYLTIP Unit
September 30, 2021	October 29, 2021	$0.98	$0.098
June 30, 2021	July 30, 2021	$0.98	$0.098
March 31, 2021	April 30, 2021	$0.98	$0.098
December 31, 2020	January 28, 2021	$0.98	$0.098

XML

Stockholders' Equity / Partners' Capital (Tables)

9 Months Ended

Sep. 30, 2022

Class of Stock [Line Items]

Dividends Declared [Table Text Block]

The following table presents BXP’s dividends per share and BPLP’s distributions per OP Unit and LTIP Unit paid or declared in 2022 and during the nine months ended September 30, 2021:

Record Date	Payment Date	Dividend (Per Share)	Distribution (Per Unit)
September 30, 2022	October 31, 2022	$0.98	$0.98
June 30, 2022	July 29, 2022	$0.98	$0.98
March 31, 2022	April 29, 2022	$0.98	$0.98
December 31, 2021	January 28, 2022	$0.98	$0.98
September 30, 2021	October 29, 2021	$0.98	$0.98
June 30, 2021	July 30, 2021	$0.98	$0.98
March 31, 2021	April 30, 2021	$0.98	$0.98
December 31, 2020	January 28, 2021	$0.98	$0.98

Series B Preferred Stock [Member]

Class of Stock [Line Items]

Dividends Declared [Table Text Block]

The following table presents BXP’s dividend per share on its Series B Preferred Stock paid during the nine months ended September 30, 2021:

Record Date	Payment Date	Dividend (Per Share)
February 5, 2021	February 16, 2021	$32.8125

XML

Segment Information (Tables)

9 Months Ended

Sep. 30, 2022

Segment Reporting [Abstract]

Schedule Of Reconciliation Of Net Operating Income To Net Income

BXP

	Three months ended September 30,				Nine months ended September 30,
	2022		2021		2022		2021
	(in thousands)
Net income attributable to Boston Properties, Inc. common shareholders	$	360,977	$	108,297	$	727,144	$	311,680
Add:
Preferred stock redemption charge	—		—		—		6,412
Preferred dividends	—		—		—		2,560
Noncontrolling interest—common units of the Operating Partnership	40,883		11,982		82,821		35,393
Noncontrolling interests in property partnerships	18,801		18,971		54,896		52,602
Interest expense	111,846		105,794		317,216		320,015
Losses from early extinguishment of debt	—		—		—		898
Net operating income from unconsolidated joint ventures	35,316		24,266		108,347		74,478
Loss from unconsolidated joint ventures	3,524		5,597		1,389		1,745
Depreciation and amortization expense	190,675		179,412		551,445		539,815
Transaction costs	1,650		1,888		2,146		2,970
Payroll and related costs from management services contracts	3,900		3,006		11,204		9,166
General and administrative expense	32,519		34,560		110,378		117,924
Less:
Net operating income attributable to noncontrolling interests in property partnerships	48,306		47,800		143,223		138,463
Gains (losses) from investments in securities	(1,571)		(190)		(8,549)		3,744
Other income - assignment fee	—		—		6,624		—
Interest and other income (loss)	3,728		1,520		6,151		4,140
Gains on sales of real estate	262,345		348		381,293		8,104
Direct reimbursements of payroll and related costs from management services contracts	3,900		3,006		11,204		9,166
Development and management services revenue	7,465		6,094		19,650		20,181
Company’s share of Net Operating Income	$	475,918	$	435,195	$	1,407,390	$	1,291,860

BPLP

	Three months ended September 30,				Nine months ended September 30,
	2022		2021		2022		2021
	(in thousands)
Net income attributable to Boston Properties Limited Partnership common unitholders	$	403,578	$	122,014	$	819,195	$	353,633
Add:
Preferred unit redemption charge	—		—		—		6,412
Preferred distributions	—		—		—		2,560
Noncontrolling interests in property partnerships	18,801		18,971		54,896		52,602
Interest expense	111,846		105,794		317,216		320,015
Losses from early extinguishment of debt	—		—		—		898
Net operating income from unconsolidated joint ventures	35,316		24,266		108,347		74,478
Loss from unconsolidated joint ventures	3,524		5,597		1,389		1,745
Depreciation and amortization expense	188,969		177,677		546,271		533,255
Transaction costs	1,650		1,888		2,146		2,970
Payroll and related costs from management services contracts	3,900		3,006		11,204		9,166
General and administrative expense	32,519		34,560		110,378		117,924
Less:
Net operating income attributable to noncontrolling interests in property partnerships	48,306		47,800		143,223		138,463
Gains (losses) from investments in securities	(1,571)		(190)		(8,549)		3,744
Other income - assignment fee	—		—		6,624		—
Interest and other income (loss)	3,728		1,520		6,151		4,140
Gains on sales of real estate	262,357		348		385,349		8,104
Direct reimbursements of payroll and related costs from management services contracts	3,900		3,006		11,204		9,166
Development and management services revenue	7,465		6,094		19,650		20,181
Company’s share of Net Operating Income	$	475,918	$	435,195	$	1,407,390	$	1,291,860

Schedule Of Segment Information By Geographic Area And Property Type

Information by geographic area and property type (dollars in thousands):

For the three months ended September 30, 2022:

	Boston			Los Angeles			New York			San Francisco			Seattle			Washington, DC			Total
Rental Revenue: (1)
Office	$	255,958		$	—		$	260,926		$	134,938		$	12,293		$	88,954		$	753,069
Residential	3,837			—			—			3,133			—			7,370			14,340
Hotel	11,749			—			—			—			—			—			11,749
Total	271,544			—			260,926			138,071			12,293			96,324			779,158
% of Grand Totals	34.85		%	—		%	33.49		%	17.72		%	1.58		%	12.36		%	100.00		%
Rental Expenses:
Office	91,226			—			99,942			47,068			3,125			33,317			274,678
Residential	1,552			—			—			2,125			—			3,347			7,024
Hotel	8,548			—			—			—			—			—			8,548
Total	101,326			—			99,942			49,193			3,125			36,664			290,250
% of Grand Totals	34.91		%	—		%	34.43		%	16.95		%	1.08		%	12.63		%	100.00		%
Net operating income	$	170,218		$	—		$	160,984		$	88,878		$	9,168		$	59,660		$	488,908
% of Grand Totals	34.81		%	—		%	32.93		%	18.18		%	1.88		%	12.20		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(11,293)			—			(37,013)			—			—			—			(48,306)
Add: Company’s share of net operating income (loss) from unconsolidated joint ventures	8,169			13,143			(259)			3,233			1,978			9,052			35,316
Company’s share of net operating income	$	167,094		$	13,143		$	123,712		$	92,111		$	11,146		$	68,712		$	475,918
% of Grand Totals	35.12		%	2.76		%	25.99		%	19.35		%	2.34		%	14.44		%	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.

For the three months ended September 30, 2021:

	Boston			Los Angeles			New York			San Francisco			Seattle			Washington, DC			Total
Rental Revenue: (1)
Office	$	236,080		$	—		$	257,656		$	125,340		$	—		$	85,797		$	704,873
Residential	3,418			—			—			806			—			6,670			10,894
Hotel	5,189			—			—			—			—			—			5,189
Total	244,687			—			257,656			126,146			—			92,467			720,956
% of Grand Totals	33.93		%	—		%	35.74		%	17.50		%	—		%	12.83		%	100.00		%
Rental Expenses:
Office	82,697			—			94,338			43,582			—			31,619			252,236
Residential	1,396			—			—			1,688			—			2,961			6,045
Hotel	3,946			—			—			—			—			—			3,946
Total	88,039			—			94,338			45,270			—			34,580			262,227
% of Grand Totals	33.57		%	—		%	35.98		%	17.26		%	—		%	13.19		%	100.00		%
Net operating income	$	156,648		$	—		$	163,318		$	80,876		$	—		$	57,887		$	458,729
% of Grand Totals	34.15		%	—		%	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 ventures	3,464			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 Totals	34.30		%	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.

Information by geographic area and property type (dollars in thousands):

For the nine months ended September 30, 2022:

	Boston			Los Angeles			New York			San Francisco			Seattle			Washington, DC			Total
Rental Revenue: (1)
Office	$	742,972		$	—		$	772,060		$	401,020		$	18,765		$	280,473		$	2,215,290
Residential	11,181			—			—			11,374			—			21,663			44,218
Hotel	28,395			—			—			—			—			—			28,395
Total	782,548			—			772,060			412,394			18,765			302,136			2,287,903
% of Grand Totals	34.20		%	—		%	33.75		%	18.02		%	0.82		%	13.21		%	100.00		%
Rental Expenses:
Office	268,781			—			291,645			135,677			4,805			101,623			802,531
Residential	4,481			—			—			9,138			—			9,655			23,274
Hotel	19,832			—			—			—			—			—			19,832
Total	293,094			—			291,645			144,815			4,805			111,278			845,637
% of Grand Totals	34.66		%	—		%	34.49		%	17.12		%	0.57		%	13.16		%	100.00		%
Net operating income	$	489,454		$	—		$	480,415		$	267,579		$	13,960		$	190,858		$	1,442,266
% of Grand Totals	33.94		%	—		%	33.31		%	18.55		%	0.97		%	13.23		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(34,405)			—			(108,818)			—			—			—			(143,223)
Add: Company’s share of net operating income (loss) from unconsolidated joint ventures	25,996			40,147			(397)			9,597			5,877			27,127			108,347
Company’s share of net operating income	$	481,045		$	40,147		$	371,200		$	277,176		$	19,837		$	217,985		$	1,407,390
% of Grand Totals	34.18		%	2.85		%	26.38		%	19.69		%	1.41		%	15.49		%	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.

For the nine months ended September 30, 2021:

	Boston			Los Angeles			New York			San Francisco			Seattle				Washington, DC			Total
Rental Revenue: (1)
Office	$	696,054		$	—		$	760,002		$	382,119		$	—			$	252,822		$	2,090,997
Residential	9,594			—			—			1,817			—				18,421			29,832
Hotel	7,382			—			—			—			—				—			7,382
Total	713,030			—			760,002			383,936			—				271,243			2,128,211
% of Grand Totals	33.50		%	—		%	35.71		%	18.04		%	—		%		12.75		%	100.00		%
Rental Expenses:
Office	240,743			—			286,385			124,785			—				94,360			746,273
Residential	4,286			—			—			4,918			—				8,896			18,100
Hotel	7,993			—			—			—			—				—			7,993
Total	253,022			—			286,385			129,703			—			—	103,256			772,366
% of Grand Totals	32.76		%	—		%	37.08		%	16.79		%	—		%		13.37		%	100.00		%
Net operating income	$	460,008		$	—		$	473,617		$	254,233		$	—			$	167,987		$	1,355,845
% of Grand Totals	33.93		%	—		%	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 (loss) from unconsolidated joint ventures	9,369			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 Totals	33.88		%	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.

XML

Earnings Per Share / Common Unit (Tables)

9 Months Ended

Sep. 30, 2022

Entity Information [Line Items]

Computation Of Basic And Diluted Earnings Per Share / Unit

	Three months ended September 30, 2022
	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	$	360,977	156,754	$	2.30
Allocation of undistributed earnings to participating securities	(762)		—	—
Net income attributable to Boston Properties, Inc. common shareholders	360,215		156,754	2.30
Effect of Dilutive Securities:
Stock Based Compensation	—		379	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	360,215	157,133	$	2.29
	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

	Nine months ended September 30, 2022
	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	$	727,144	156,708	$	4.64
Allocation of undistributed earnings to participating securities	(1,002)		—	(0.01)
Net income attributable to Boston Properties, Inc. common shareholders	726,142		156,708	4.63
Effect of Dilutive Securities:
Stock Based Compensation	—		436	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	726,142	157,144	$	4.62

	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

Boston Properties Limited Partnership

Entity Information [Line Items]

Computation Of Basic And Diluted Earnings Per Share / Unit

Included in the number of units (the denominator) below are approximately 17,662,000 and 17,011,000 redeemable common units for the three months ended September 30, 2022 and 2021, respectively, and 17,631,000 and 17,016,000 redeemable common units for the nine months ended September 30, 2022 and 2021, respectively.

	Three months ended September 30, 2022
	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	$	403,578	174,416	$	2.31
Allocation of undistributed earnings to participating securities	(848)		—	—
Net income attributable to Boston Properties, Inc. common shareholders	402,730		174,416	2.31
Effect of Dilutive Securities:
Stock Based Compensation	—		379	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	402,730	174,795	$	2.30

	Three 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	$	122,014	173,194	$	0.70
Effect of Dilutive Securities:
Stock Based Compensation	—		415	—
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	122,014	173,609	$	0.70

	Nine months ended September 30, 2022
	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	$	819,195	174,339	$	4.70
Allocation of undistributed earnings to participating securities	(1,115)		—	(0.01)
Net income attributable to Boston Properties Limited Partnership common unitholders	$	818,080	174,339	$	4.69
Effect of Dilutive Securities:
Stock Based Compensation	—		436	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	818,080	174,775	$	4.68
	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

XML

Organization (Details) ft² in Millions		9 Months Ended
	Dec. 31, 2021	Sep. 30, 2022 ft² Real_Estate_Properties yr shares
Real Estate Properties [Line Items]
Restriction on redemption of OP units from date of issuance (years) | yr		1
One OP unit is equivalent to one share of Common Stock (in shares) | shares		1
OP unit conversion rate (in shares) | shares		1
Construction in Progress
Real Estate Properties [Line Items]
Number of real estate properties		14
Net Rentable Area (in sf) | ft²		4.4
Commercial Real Estate Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties		193
Net Rentable Area (in sf) | ft²		53.5
Office Building [Member]
Real Estate Properties [Line Items]
Number of real estate properties		173
Office Building [Member] | Construction in Progress
Real Estate Properties [Line Items]
Number of real estate properties		12
Retail Site [Member]
Real Estate Properties [Line Items]
Number of real estate properties		12
Retail Site [Member] | Construction in Progress
Real Estate Properties [Line Items]
Number of real estate properties		1
Residential Building
Real Estate Properties [Line Items]
Number of real estate properties		7
Residential Building | Construction in Progress
Real Estate Properties [Line Items]
Number of real estate properties		1
Hotel [Member]
Real Estate Properties [Line Items]
Number of real estate properties		1
Boston Properties Limited Partnership
Real Estate Properties [Line Items]
General and limited partnership interest in the operating partnership (percent)	89.70%	89.60%

XML

Summary Of Significant Accounting Policies (Narrative) (Details)	Sep. 30, 2022
Summary Of Significant Accounting Policies [Line Items]
Number of VIEs	7
Variable Interest Entity, Primary Beneficiary [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of VIEs	6
Commercial Real Estate Properties [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of VIEs	5

XML

Summary Of Significant Accounting Policies (Carrying Value Of Indebtedness And Corresponding Estimate Of Fair Value) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	May 17, 2022	Dec. 31, 2021
Summary Of Significant Accounting Policies [Line Items]
Related party note receivable, net	$ 78,592		$ 78,336
Notes receivable, net	0		9,641
Mortgage notes payable, net	3,271,157		3,267,914
Unsecured senior notes, net	9,491,714		9,483,695
Unsecured line of credit	340,000		145,000
Unsecured term loan, net	730,000	$ 730,000	0
Carrying Amount [Member]
Summary Of Significant Accounting Policies [Line Items]
Related party note receivable, net	78,592		78,336
Notes receivable, net	0		9,641
Total	78,592		87,977
Mortgage notes payable, net	3,271,157		3,267,914
Unsecured senior notes, net	9,491,714		9,483,695
Unsecured line of credit	340,000		145,000
Unsecured term loan, net	730,000		0
Total	13,832,871		12,896,609
Estimated Fair Value [Member]
Summary Of Significant Accounting Policies [Line Items]
Related party note receivable, net	79,614		82,867
Notes receivable, net	0		10,000
Total	79,614		92,867
Mortgage notes payable, net	2,788,779		3,395,569
Unsecured senior notes, net	8,261,816		9,966,591
Unsecured line of credit	338,247		145,317
Unsecured term loan, net	730,000		0
Total	$ 12,118,842		$ 13,507,477

XML

Real Estate Schedule of Real Estate Properties (Details) - USD ($) $ in Thousands		Sep. 30, 2022	Dec. 31, 2021
Real Estate Properties [Line Items]
Land		$ 5,208,688	$ 5,061,169
Right-of-use assets - finance leases		237,505	237,507
Right of use assets - operating leases		167,935	169,778
Land held for future development	[1]	601,676	560,355
Buildings and improvements		15,598,033	14,291,214
Tenant improvements		3,061,686	2,894,025
Furniture, Fixtures and Equipment		52,126	51,695
Construction in progress		670,167	894,172
Total		25,597,816	24,159,915
Less: accumulated depreciation		(6,170,472)	(5,883,961)
Total real estate		19,427,344	18,275,954
Boston Properties Limited Partnership
Real Estate Properties [Line Items]
Land		5,113,979	4,964,986
Right-of-use assets - finance leases		237,505	237,507
Right of use assets - operating leases		167,935	169,778
Land held for future development	[1]	601,676	560,355
Buildings and improvements		15,325,228	14,014,010
Tenant improvements		3,061,686	2,894,025
Furniture, Fixtures and Equipment		52,126	51,695
Construction in progress		670,167	894,172
Total		25,230,302	23,786,528
Less: accumulated depreciation		(6,055,172)	(5,772,018)
Total real estate		$ 19,175,130	$ 18,014,510

[1] Includes pre-development costs.

XML

Real Estate (Narrative) (Details) $ in Thousands											1 Months Ended	2 Months Ended	3 Months Ended		4 Months Ended	8 Months Ended	9 Months Ended
	Sep. 16, 2022 USD ($) ft²	Sep. 15, 2022 USD ($) land_parcel	Aug. 30, 2022 USD ($) ft²	Jul. 01, 2022 ft² Building	Jun. 15, 2022 USD ($) ft² Building	May 17, 2022 USD ($) ft²	Apr. 27, 2022 ft² Building	Apr. 07, 2022 USD ($)	Mar. 31, 2022 USD ($) ft²	Apr. 19, 2021 USD ($) a ft²	Sep. 30, 2022 USD ($) ft²	Aug. 30, 2022 USD ($) ft²	Sep. 30, 2022 USD ($) ft²	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) ft²	Aug. 30, 2022 USD ($) ft²	Sep. 30, 2022 USD ($) ft²	Sep. 30, 2021 USD ($)	Sep. 12, 2022 ft²	Jul. 15, 2022 ft²	Jun. 29, 2022 ft²	May 13, 2022 ft²	Apr. 29, 2022 ft²	Dec. 31, 2021 USD ($)	May 09, 2019 ft²
Real Estate Properties [Line Items]
Total revenue													$ 790,523	$ 730,056			$ 2,318,757	$ 2,157,558
Net income													420,661	139,250			864,861	408,647
Proceeds from sales of real estate																	695,231	0
Interest and Other Income													3,728	1,520			6,151	4,140
Unsecured term loan						$ 730,000					$ 730,000		$ 730,000		$ 730,000		730,000							$ 0
Other income - assignment fee																	$ 6,624	0
Construction in Progress
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²											4,400,000		4,400,000		4,400,000		4,400,000
Boston Properties Limited Partnership
Real Estate Properties [Line Items]
Total revenue													$ 790,523	730,056			$ 2,318,757	2,157,558
Net income													422,379	140,985			874,091	415,207
Proceeds from sales of real estate																	695,231	0
Interest and Other Income													3,728	1,520			6,151	4,140
Unsecured term loan											$ 730,000		$ 730,000		$ 730,000		730,000							$ 0
Other income - assignment fee																	6,624	0
Madison Centre
Real Estate Properties [Line Items]
Noncash or Part Noncash Acquisition, Value of Assets Acquired						$ 724,300
Net Rentable Area (in sf) | ft²						755,000
Number of floors						37
Total revenue															18,800
Net income															$ 1,300
125 Broadway
Real Estate Properties [Line Items]
Noncash or Part Noncash Acquisition, Value of Assets Acquired	$ 592,400
Net Rentable Area (in sf) | ft²	271,000
Total revenue											1,600
Net income											$ 400
195 West Street
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²									63,500
Net income														400			400	200
Contractual Sales Price									$ 37,700
Proceeds from sales of real estate									35,400
Gains (Losses) on Sales of Investment Real Estate									22,700
195 West Street | Boston Properties Limited Partnership
Real Estate Properties [Line Items]
Gains (Losses) on Sales of Investment Real Estate									$ 23,400
11251 Roger Bacon Drive
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²										65,000
Asset Acquisition, Price of Acquisition, Expected										$ 5,600
Interest and Other Income								$ 6,900
Area of Land | a										2.6
Leased percentage										100.00%
Other income - assignment fee								$ 6,600
Virginia 95 Office Park
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²					733,000
Net income														1,800			$ 2,300	5,900
Contractual Sales Price					$ 127,500
Proceeds from sales of real estate					121,900
Gains (Losses) on Sales of Investment Real Estate					$ 96,200
Number of buildings | Building					11
Virginia 95 Office Park | Boston Properties Limited Partnership
Real Estate Properties [Line Items]
Gains (Losses) on Sales of Investment Real Estate					$ 99,500
601 Massachusetts Avenue
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²			479,000									479,000				479,000
Net income												$ 3,600		$ 5,600		$ 14,900		$ 16,700
Contractual Sales Price			$ 531,000									$ 531,000				$ 531,000
Proceeds from sales of real estate			512,300
Gains (Losses) on Sales of Investment Real Estate			237,400
601 Massachusetts Avenue | Boston Properties Limited Partnership
Real Estate Properties [Line Items]
Gains (Losses) on Sales of Investment Real Estate			$ 237,500
Loudoun County Land
Real Estate Properties [Line Items]
Contractual Sales Price		$ 27,000
Proceeds from sales of real estate		25,600
Gains (Losses) on Sales of Investment Real Estate		$ 24,400
Parcels of undeveloped land | land_parcel		2
290 Binney Street
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²							570,000
Lessor, Operating Lease, Lease Not yet Commenced, Description							15-year
Kendall Center future development | Scenario, Plan
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²							1,100,000
Number of buildings | Building							2
Kendall Center future development | Scenario, Plan | Residential Building
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²							400,000
2100 Pennsylvania Avenue
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²																							480,000
Reston Next Office Phase II
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²																						90,000
325 Main Street
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²																					414,000				115,000
140 Kendrick Street
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²				388,000
Number of buildings | Building				3
300 Binney Street
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²	195,000
300 Binney Street | Construction in Progress
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²	240,000
140 Kendrick - Building A
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²				90,000
Number of buildings | Building				1
140 Kendrick - Building A | Construction in Progress
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²				104,000
880 Winter Street [Member]
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²																				244,000
760 Boylston Street [Member] | Construction in Progress
Real Estate Properties [Line Items]
Net Rentable Area (in sf) | ft²																			118,000

XML

Real Estate Asset Acquisition (Details) - USD ($) $ in Thousands	Sep. 16, 2022	May 17, 2022
Madison Centre
Asset Acquisition [Line Items]
Land		$ 104,641
Building and improvements		505,766
Tenant Improvements		58,570
Net Assets Acquired		724,255
Madison Centre | In-Place Lease Intangibles
Asset Acquisition [Line Items]
Lease Intangibles		74,598
Madison Centre | Above Market Lease Intangibles [Member]
Asset Acquisition [Line Items]
Lease Intangibles		3,794
Madison Centre | Below Market Lease Intangible [Member]
Asset Acquisition [Line Items]
Lease Intangibles		$ (23,114)
125 Broadway
Asset Acquisition [Line Items]
Land	$ 126,364
Building and improvements	403,588
Tenant Improvements	30,074
Net Assets Acquired	592,438
125 Broadway | In-Place Lease Intangibles
Asset Acquisition [Line Items]
Lease Intangibles	49,137
125 Broadway | Below Market Lease Intangible [Member]
Asset Acquisition [Line Items]
Lease Intangibles	$ (16,725)

XML

Real Estate Amortization of Finite Lived Intangible Assets by Major Class (Details) - USD ($) $ in Thousands	Sep. 16, 2022	May 17, 2022
Madison Centre | In-Place Lease Intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Period from acquisition through December 31, 2022		$ 7,266
2023		12,200
2024		10,842
2025		10,770
2026		10,306
2027		9,161
Madison Centre | Above Market Lease Intangibles [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Period from acquisition through December 31, 2022		640
2023		1,098
2024		254
2025		254
2026		254
2027		254
Madison Centre | Below Market Lease Intangible [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Period from acquisition through December 31, 2022		2,011
2023		3,442
2024		3,411
2025		3,398
2026		3,210
2027		$ 2,805
125 Broadway | In-Place Lease Intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Period from acquisition through December 31, 2022	$ 2,185
2023	8,740
2024	8,740
2025	8,740
2026	8,740
2027	8,740
125 Broadway | Below Market Lease Intangible [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Period from acquisition through December 31, 2022	744
2023	2,975
2024	2,975
2025	2,975
2026	2,975
2027	$ 2,975

XML

Leases Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Lessor, Lease, Description [Line Items]
Write-off (reinstatement) for accrued rent and accounts receivables	$ 0	$ 0	$ (1,500)	$ 1,300

XML

Leases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Leases [Abstract]
Fixed contractual payments	$ 610,878	$ 581,393	$ 1,811,836	$ 1,732,930
Variable lease payments	128,377	110,867	367,438	329,172
Lease	$ 739,255	$ 692,260	$ 2,179,274	$ 2,062,102

XML

Investments in Unconsolidated Joint Ventures (Investments in Unconsolidated Joint Ventures) (Details) $ in Thousands		9 Months Ended
		Sep. 30, 2022 USD ($) ft² payments	Dec. 31, 2021 USD ($)
Schedule of Equity Method Investments [Line Items]
Other Liabilities		$ (417,255)	$ (391,441)
Investments in unconsolidated joint ventures		1,593,834	1,482,997
Investments In Affiliates Subsidiaries Associates And Joint Ventures net	[1]	1,526,819	1,445,926
Unconsolidated Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Other Liabilities		$ (67,000)	(37,100)
Square 407 Limited Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Properties		Market Square North
Ownership Percentage		50.00%
Other Liabilities	[1]	$ (5,759)	(1,205)
BP/CRF Metropolitan Square LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		Metropolitan Square
Ownership Percentage		20.00%
Other Liabilities	[1]	$ (39,318)	(15,356)
901 New York Avenue LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		901 New York Avenue
Ownership Percentage	[2]	25.00%
Other Liabilities	[1]	$ (12,506)	$ (12,597)
901 New York Avenue LLC (economic ownership) [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		50.00%	50.00%
WP Project Developer LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		Wisconsin Place Land and Infrastructure
Ownership Percentage	[3]	33.33%
Investments in unconsolidated joint ventures	[1]	$ 32,638	$ 33,732
500 North Capitol Venture LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		500 North Capitol Street, NW
Ownership Percentage		30.00%
Other Liabilities	[1]	$ (9,432)	(7,913)
501 K Street LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		1001 6th Street
Ownership Percentage	[4]	50.00%
Investments in unconsolidated joint ventures	[1]	$ 42,922	42,576
Potential additonal payments to joint venture partner | payments		2
Minimum square footage to make a potential additional payment to joint venture partner (in sqft) | ft²		520,000
Podium Developer LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		The Hub on Causeway - Podium
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 48,571	48,980
Residential Tower Developer LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		Hub50House
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 45,662	47,774
Hotel Tower Developer LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		The Hub on Causeway - Hotel Air Rights
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 12,165	11,505
Office Tower Developer LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		100 Causeway Street
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 59,379	57,687
1265 Main Office JV LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		1265 Main Street
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 3,358	3,541
BNY Tower Holdings LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		Dock 72
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 26,947	27,343
BNYA Amenity Operator LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		Dock 72
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 825	1,069
CA-Colorado Center LLC[Member]
Schedule of Equity Method Investments [Line Items]
Properties		Colorado Center
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 234,271	231,479
7750 Wisconsin Avenue LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		7750 Wisconsin Avenue
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 52,656	61,626
BP-M 3HB Venture LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		3 Hudson Boulevard
Ownership Percentage		25.00%
Investments in unconsolidated joint ventures	[1]	$ 116,678	116,306
SMBP Venture LP [Member]
Schedule of Equity Method Investments [Line Items]
Properties		Santa Monica Business Park
Ownership Percentage		55.00%
Investments in unconsolidated joint ventures	[1]	$ 166,302	156,639
Platform 16 Holdings LP [Member]
Schedule of Equity Method Investments [Line Items]
Properties		Platform 16
Ownership Percentage	[5]	55.00%
Investments in unconsolidated joint ventures	[1]	$ 143,558	109,086
Gateway Portfolio Holdings LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		Gateway Commons
Ownership Percentage	[6]	50.00%
Investments in unconsolidated joint ventures	[1]	$ 314,137	327,148
Rosecrans-Sepulveda Partners 4, LLC
Schedule of Equity Method Investments [Line Items]
Properties		Beach Cities Media Campus
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 27,017	27,106
Entity Owning Land And Infrastructure Of Project [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		33.33%
Safeco Plaza REIT LLC
Schedule of Equity Method Investments [Line Items]
Properties		Safeco Plaza
Ownership Percentage	[7]	33.67%
Investments in unconsolidated joint ventures	[1]	$ 70,889	72,545
Safeco Plaza REIT LLC | Company's Share [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		33.00%
360 PAS Holdco LLC
Schedule of Equity Method Investments [Line Items]
Properties		360 Park Avenue South
Ownership Percentage	[8]	42.21%
Investments in unconsolidated joint ventures	[1]	$ 112,772	$ 106,855
360 PAS Holdco LLC | Company's Share [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		35.79%
360 PAS Holdco LLC | Joint Venture Partner [Member] | Scenario, Plan
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		58.00%
Safeco Partner Entity One [Member] | Company's Share [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		1.00%
Safeco Partner Entity Two | Company's Share [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		1.00%
360 PAS Holdco LLC (indirect ownership) | Company's Share [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		5.837%
360 Park Avenue South Partners Entity | Company's Share [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		1.00%
360 Park Avenue South Partners Entity Two | Company's Share [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		1.00%
PR II BXP Reston Gateway LLC
Schedule of Equity Method Investments [Line Items]
Properties		Reston Next Residential
Ownership Percentage	[9]	20.00%
Investments in unconsolidated joint ventures	[1]	$ 11,267
PR II BXP Reston Gateway LLC | Joint Venture Partner [Member] | Scenario, Plan
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		80.00%
751 Gateway Holdings LLC
Schedule of Equity Method Investments [Line Items]
Properties		751 Gateway
Ownership Percentage	[6]	49.00%
Investments in unconsolidated joint ventures	[1]	$ 71,820

[1] Investments with deficit balances aggregating approximately $67.0 million and $37.1 million at September 30, 2022 and December 31, 2021, respectively, 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, 2022 and December 31, 2021, 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.

[4] 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 in excess of 520,000 square feet and achieving certain project returns at stabilization.

[5] This entity is a VIE (See Note 2).

[6] On June 16, 2022, in accordance with the Gateway Commons joint venture agreement, 751 Gateway was segregated into a new single-purpose joint venture.

[7] 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 through which each partner owns its interest in the joint venture.

[8] The Company’s ownership includes (1) a 35.79% direct interest in the joint venture, (2) an additional 5.837% indirect ownership in the joint venture, and (3) an additional 1% interest in each of the two entities through which each partner owns its interest in the joint venture. The Company’s partners will fund required capital until their aggregate investment is approximately 58% of all capital contributions; thereafter, the partners will fund required capital according to their percentage interests.

[9] The Company’s partner will fund required capital until its aggregate investment is approximately 80% of all capital contributions; thereafter, the partners will fund required capital according to their percentage interests.

XML

Investments in Unconsolidated Joint Ventures (Balance Sheets of the Unconsolidated Joint Ventures) (Details) - USD ($) $ in Thousands		Sep. 30, 2022	Dec. 31, 2021
ASSETS
Real estate and development in process, net		$ 19,427,344	$ 18,275,954
Total assets		23,726,691	22,365,258
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Mortgage and notes payable, net		3,271,157	3,267,914
Other Liabilities		417,255	391,441
Members’/Partners’ equity		6,155,618	5,834,020
Total liabilities and equity / capital		23,726,691	22,365,258
Carying value of the Company's investment in unconsolidated joint ventures		1,593,834	1,482,997
Right-of-use assets - finance leases		237,505	237,507
Right of use assets - operating leases		167,935	169,778
Lease liabilities - finance leases		248,092	244,421
Lease liabilities - operating leases		205,008	204,561
Unconsolidated Joint Ventures [Member]
ASSETS
Real estate and development in process, net	[1]	5,858,271	5,579,218
Other assets		655,549	586,470
Total assets		6,513,820	6,165,688
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Mortgage and notes payable, net		3,425,972	3,214,961
Other Liabilities	[2]	681,228	652,135
Members’/Partners’ equity		2,406,620	2,298,592
Total liabilities and equity / capital		6,513,820	6,165,688
Company's share of equity		1,180,507	1,104,175
Basis differentials	[3]	346,312	341,751
Carying value of the Company's investment in unconsolidated joint ventures	[4]	1,526,819	1,445,926
Right-of-use assets - finance leases		248,900	248,900
Right of use assets - operating leases		21,400	22,300
Lease liabilities - finance leases		383,000	385,500
Lease liabilities - operating leases		30,500	30,400
Unconsolidated Joint Ventures [Member]
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Other Liabilities		67,000	37,100
Colorado Center
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Basis differentials		302,539	304,776
Carying value of the Company's investment in unconsolidated joint ventures	[5]	234,271	231,479
Gateway Commons Complex [Member]
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Basis differentials		51,188	51,009
Carying value of the Company's investment in unconsolidated joint ventures	[5]	314,137	327,148
Dock 72
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Basis differentials		(48,753)	(50,051)
Carying value of the Company's investment in unconsolidated joint ventures	[5]	$ 26,947	$ 27,343

[1] At September 30, 2022 and December 31, 2021, this amount included right of use assets - finance leases totaling approximately $248.9 million. At September 30, 2022 and December 31, 2021, this amount included right of use assets - operating leases totaling approximately $21.4 million and $22.3 million, respectively.

[2] At September 30, 2022 and December 31, 2021, this amount included lease liabilities - finance leases totaling approximately $383.0 million and $385.5 million, respectively. At September 30, 2022 and December 31, 2021, this amount included lease liabilities - operating leases totaling approximately $30.5 million and $30.4 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, 2022December 31, 2021Property(in thousands)Colorado Center$302,539 $304,776 Gateway Commons51,188 51,009 Dock 72(48,753)(50,051) 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 $67.0 million and $37.1 million at September 30, 2022 and December 31, 2021, respectively, are reflected within Other Liabilities in the Company’s Consolidated Balance Sheets.

[5] Investments with deficit balances aggregating approximately $67.0 million and $37.1 million at September 30, 2022 and December 31, 2021, respectively, are included within Other Liabilities in the Company’s Consolidated Balance Sheets.

XML

Investments in Unconsolidated Joint Ventures (Statements of Operations of the Joint Ventures) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021		Mar. 30, 2021
Schedule of Equity Method Investments [Line Items]
Total revenue		$ 790,523	$ 730,056	$ 2,318,757	$ 2,157,558
Expenses
Transaction costs		1,650	1,888	2,146	2,970
Depreciation and amortization		190,675	179,412	551,445	539,815
Total expenses		518,994	481,093	1,520,810	1,442,241
Other income (expense)
Loss from early extinguishment of debt		0	0	0	(898)
Interest expense		(111,846)	(105,794)	(317,216)	(320,015)
Gains on sales of real estate		262,345	348	381,293	8,104
Net income		420,661	139,250	864,861	408,647
Income (Loss) from Equity Method Investments		(3,524)	(5,597)	(1,389)	(1,745)
Write-off (reinstatement) for accrued rent and accounts receivables		0	0	(1,500)	1,300
Above and below market rent adjustments, net				4,200
Unconsolidated Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Total revenue	[1]	127,996	90,009	373,358	268,501
Expenses
Operating		52,886	40,378	143,880	114,299
Transaction costs		(65)	0	746	7
Depreciation and amortization		44,132	36,036	132,089	103,766
Total expenses		96,953	76,414	276,715	218,072
Other income (expense)
Loss from early extinguishment of debt		0	0	(1,327)	0
Interest expense		(40,678)	(27,519)	(103,270)	(78,711)
Net income		(9,635)	(13,924)	(7,954)	(28,282)
Company's share of net income		(2,251)	(4,491)	2,225	(10,268)
Gain on Sale of Investments		0	0	0	10,257	[2]
Basis differential	[3]	(1,273)	(1,106)	(3,614)	(1,734)
Income (Loss) from Equity Method Investments		(3,524)	(5,597)	(1,389)	(1,745)
Straight Line Rent Adjustments		(9,600)	(5,500)	(54,900)	(11,600)
Write-off (reinstatement) for accrued rent and accounts receivables				(2,500)
Annapolis Junction NFM, LLC [Member]
Other income (expense)
Gain on Sale of Investments					10,300
Ownership Percentage							50.00%
Colorado Center [Member]
Other income (expense)
Straight Line Rent Adjustments		100	100	300	700
Above and below market rent adjustments, net		$ 100	$ 100	$ 300	$ 200

[1] Includes straight-line rent adjustments of approximately $9.6 million and $5.5 million for the three months ended September 30, 2022 and 2021, respectively, and approximately $54.9 million and $11.6 million for the nine months ended September 30, 2022 and 2021, respectively. For the nine months ended September 30, 2022, reinstatement of accrued rent balances totaled approximately $2.5 million

[2] During the nine months ended September 30, 2021, the Company completed 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 for each of the three months ended September 30, 2022 and 2021, and approximately $0.3 million and $0.7 million for the nine months ended September 30, 2022 and 2021, respectively. Also includes net above-/below-market rent adjustments of approximately $0.1 million for each of the three months ended September 30, 2022 and 2021, and approximately $0.3 million and $0.2 million for the nine months ended September 30, 2022 and 2021, respectively.

XML

Investment in Unconsolidated Joint Ventures (Narrative) (Details) $ in Thousands													3 Months Ended		9 Months Ended
		Sep. 09, 2022 USD ($) ft²	Sep. 08, 2022 USD ($)	Sep. 01, 2022 USD ($) ft²	Aug. 08, 2022 USD ($) ft²	Aug. 07, 2022 USD ($)	Jun. 17, 2022 USD ($)	Jun. 16, 2022 USD ($) ft²	May 13, 2022 USD ($) loanExtension years	Apr. 18, 2022 USD ($) ft²	Mar. 28, 2022 USD ($) loanExtension years	Mar. 27, 2022 USD ($) loanExtension years	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Feb. 02, 2022 ft²	Jan. 18, 2022 ft²	Dec. 31, 2021 USD ($)
Schedule of Equity Method Investments [Line Items]
Mortgage notes payable, net (amounts related to VIEs of $3,271,157 and $3,267,914 at September 30, 2022 and December 31, 2021, respectively)													$ 3,271,157		$ 3,271,157				$ 3,267,914
Payment for Debt Extinguishment or Debt Prepayment Cost															0	$ 185
Loss from early extinguishment of debt													$ 0	$ 0	$ 0	(898)
Gateway Commons Complex [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	[1]												50.00%		50.00%
Gateway Commons Complex [Member] | 651 Gateway | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage																		50.00%
Platform 16
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	[2]												55.00%		55.00%
Platform 16 | Platform 16 | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage																	55.00%
Net Rentable Area (in sf) | ft²																	1,100,000
BP/CRF Metropolitan Square LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage													20.00%		20.00%
BP/CRF Metropolitan Square LLC [Member] | Metropolitan Square | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage											20.00%
Net Rentable Area (in sf) | ft²				657,000
Mortgage notes payable, net (amounts related to VIEs of $3,271,157 and $3,267,914 at September 30, 2022 and December 31, 2021, respectively)											$ 420,000	$ 294,100
Debt Instrument, Description of Variable Rate Basis												the greater of (x) LIBOR or (y) 0.65%
Debt Instrument, Basis Spread on Variable Rate											2.75%	4.75%
Number of extensions | loanExtension											3	2
Extension Option (in years) | years											1	1
Payment for Debt Extinguishment or Debt Prepayment Cost											$ 0
Loss from early extinguishment of debt											(1,300)
Proceeds from mortgage notes payable											100,500
BP/CRF Metropolitan Square LLC [Member] | Metropolitan Square | Unconsolidated Properties | Interest Rate Cap
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Description of Variable Rate Basis				SOFR
Derivative, Notional Amount				$ 420,000
Derivative, Cap Interest Rate				4.50%
Residential Tower Developer LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage													50.00%		50.00%
Residential Tower Developer LLC [Member] | Hub50House [Member] | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage										50.00%
Proceeds from mortgage notes payable							$ 6,800
Residential Tower Developer LLC [Member] | Hub50House [Member] | Unconsolidated Properties | Interest Rate Swap
Schedule of Equity Method Investments [Line Items]
Derivative, Notional Amount							$ 185,000
Derivative, Forward Interest Rate							4.432%
Residential Tower Developer LLC [Member] | Hub50House [Member] | Unconsolidated Properties | Adjustable Rate Loans
Schedule of Equity Method Investments [Line Items]
Mortgage notes payable, net (amounts related to VIEs of $3,271,157 and $3,267,914 at September 30, 2022 and December 31, 2021, respectively)							$ 185,000	$ 176,700		$ 176,500
Debt Instrument, Basis Spread on Variable Rate							1.35%			2.00%
PR II BXP Reston Gateway LLC
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	[3]												20.00%		20.00%
751 Gateway Holdings LLC
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	[1]												49.00%		49.00%
BNY Tower Holdings LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage													50.00%		50.00%
BNY Tower Holdings LLC [Member] | Dock 72 [Member] | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage					50.00%
Net Rentable Area (in sf) | ft²					669,000
Mortgage notes payable, net (amounts related to VIEs of $3,271,157 and $3,267,914 at September 30, 2022 and December 31, 2021, respectively)					$ 198,400	$ 198,400
Debt Instrument, Description of Variable Rate Basis					the greater of (x) SOFR or (y) 0.25%	LIBOR
Debt Instrument, Basis Spread on Variable Rate					3.10%	3.35%
Debt instrument, borrowing capacity						$ 250,000
Safeco Plaza REIT LLC
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	[4]												33.67%		33.67%
Safeco Plaza REIT LLC | Safeco Plaza | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		33.67%
Net Rentable Area (in sf) | ft²		765,000
Mortgage notes payable, net (amounts related to VIEs of $3,271,157 and $3,267,914 at September 30, 2022 and December 31, 2021, respectively)			$ 250,000
Debt Instrument, Description of Variable Rate Basis		the greater of (x) 2.35% or (y) SOFR	the greater of (x) 2.35% or (y) LIBOR
Debt Instrument, Basis Spread on Variable Rate		2.32%	2.20%
Safeco Plaza REIT LLC | Safeco Plaza | Unconsolidated Properties | Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.35%	2.35%
Safeco Plaza REIT LLC | Safeco Plaza | Unconsolidated Properties | Interest Rate Cap
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Description of Variable Rate Basis		SOFR
Derivative, Notional Amount		$ 250,000
Derivative, Cap Interest Rate		2.50%
Joint Venture Partner [Member] | PR II BXP Reston Gateway LLC | Reston Next Residential | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Interest in Joint Venture									$ 500
Joint Venture Partner [Member] | PR II BXP Reston Gateway LLC | Reston Next Residential | Unconsolidated Properties | Scenario, Plan
Schedule of Equity Method Investments [Line Items]
Ownership Percentage									80.00%
Payments to Acquire Interest in Joint Venture									$ 58,700
Joint Venture Partner [Member] | 751 Gateway Holdings LLC | 751 Gateway | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage								51.00%
Contribution of Property								$ 53,900
Payments to Acquire Interest in Joint Venture								$ 4,900
Unconsolidated Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Mortgage notes payable, net (amounts related to VIEs of $3,271,157 and $3,267,914 at September 30, 2022 and December 31, 2021, respectively)													$ 3,425,972		$ 3,425,972				$ 3,214,961
Loss from early extinguishment of debt													$ 0	$ 0	$ (1,327)	$ 0
Unconsolidated Joint Ventures [Member] | PR II BXP Reston Gateway LLC | Reston Next Residential | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Contribution of Property									11,300
Unconsolidated Joint Ventures [Member] | PR II BXP Reston Gateway LLC | Reston Next Residential | Unconsolidated Properties | Scenario, Plan
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Interest in Joint Venture									$ 3,500
Unconsolidated Joint Ventures [Member] | PR II BXP Reston Gateway LLC | Reston Next Residential | Unconsolidated Properties | Adjustable Rate Loans
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Description of Variable Rate Basis									SOFR
Debt Instrument, Basis Spread on Variable Rate									2.00%
Number of extensions | loanExtension									2
Extension Option (in years) | years									1
Debt Instrument, Unused Borrowing Capacity, Amount									$ 140,000
Unconsolidated Joint Ventures [Member] | 751 Gateway Holdings LLC | 751 Gateway | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage								49.00%
Contribution of Property								$ 53,900
Payments to Acquire Interest in Joint Venture								$ 2,600
Company's Share [Member] | BP/CRF Metropolitan Square LLC [Member] | Metropolitan Square
Schedule of Equity Method Investments [Line Items]
Proceeds from mortgage notes payable											$ 20,100
Company's Share [Member] | Residential Tower Developer LLC [Member] | Hub50House [Member] | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Proceeds from mortgage notes payable							$ 3,400
Company's Share [Member] | PR II BXP Reston Gateway LLC | Reston Next Residential | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage									96.00%
Company's Share [Member] | PR II BXP Reston Gateway LLC | Reston Next Residential | Unconsolidated Properties | Scenario, Plan
Schedule of Equity Method Investments [Line Items]
Ownership Percentage									20.00%
Construction | Gateway Commons Complex [Member] | 651 Gateway | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Net Rentable Area (in sf) | ft²																		327,000
Construction | Platform 16 | Platform 16 | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Net Rentable Area (in sf) | ft²																	390,000
Construction | 751 Gateway Holdings LLC | 751 Gateway | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Net Rentable Area (in sf) | ft²								231,000
Construction | Unconsolidated Joint Ventures [Member] | PR II BXP Reston Gateway LLC | Reston Next Residential | Unconsolidated Properties | Scenario, Plan
Schedule of Equity Method Investments [Line Items]
Number of Units in Real Estate Property									508
Residential Building | Residential Tower Developer LLC [Member] | Hub50House [Member] | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Net Rentable Area (in sf) | ft²										320,000
Number of Units in Real Estate Property										440

[1] On June 16, 2022, in accordance with the Gateway Commons joint venture agreement, 751 Gateway was segregated into a new single-purpose joint venture.

[2] This entity is a VIE (See Note 2).

[3] The Company’s partner will fund required capital until its aggregate investment is approximately 80% of all capital contributions; thereafter, the partners will fund required capital according to their percentage interests.

[4] 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 through which each partner owns its interest in the joint venture.

XML

Unsecured Term Loan (Details) - USD ($) $ in Thousands			9 Months Ended
	Sep. 30, 2022	May 17, 2022	Sep. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Unsecured term loan	$ 730,000	$ 730,000	$ 730,000	$ 0
Unsecured Term Loan
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 730,000
Debt Instrument, Interest Rate Terms		At BPLP’s option, the Unsecured Term Loan will bear interest at a rate per annum equal to (A) (1) a base rate per annum equal to the greater of (a) the federal funds rate plus 0.5%, (b) the administrative agent’s prime rate, (c) term SOFR plus 1.00% and (d) 1.00%, or (2) a term SOFR rate per annum equal to the forward-looking SOFR term rate administered by CME Group Benchmark Administration (“CME”) two business days prior to the commencement of such interest period; or if the rate is unavailable, then the forward-looking SOFR term rate administered by CME on the first business day immediately prior thereto, in each case, plus 0.10%, and (B) a margin ranging from zero to 160 basis points based on BPLP’s credit rating.
Unsecured term loan	$ 730,000	$ 730,000	$ 730,000
Debt Instrument, Covenant Description		The Unsecured Term Loan 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 any outstanding amount under the Unsecured Term Loan. Among other covenants, the Unsecured Term Loan requires that BPLP 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.
Debt Instrument, Covenant Compliance			At September 30, 2022, BPLP was in compliance with each of these financial and other covenant requirements.
Debt Instrument, Basis Spread on Variable Rate		1.00%
Debt Instrument, Maturity Date		May 16, 2023
Debt Instrument, Interest Rate, Increase (Decrease)		0.10%
Leverage ratio		60.00%
Leverage ratio - maximum		65.00%
Secured debt leverage ratio - maximum		55.00%
Fixed charge coverage - minimum		1.40
Unsecured debt leverage ratio		60.00%
Unsecured debt leverage ratio - maximum		65.00%
Unsecured debt interest coverage ratio		1.75
Unsecured Term Loan | Fed Funds Effective Rate Overnight Index Swap Rate
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.50%
Unsecured Term Loan | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.95%	1.00%
Unsecured Term Loan | Margin based on borrower's credit rating | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Increase (Decrease)		1.60%
Unsecured Term Loan | Margin based on borrower's credit rating | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Increase (Decrease)		0.00%

XML

Commitments And Contingencies (Details) $ in Thousands		9 Months Ended
	Jun. 27, 2022 USD ($)	Sep. 30, 2022 USD ($) ft²	Sep. 30, 2021 USD ($)	Jun. 29, 2022 ft²	Jun. 26, 2022 USD ($)	Dec. 31, 2021 USD ($)	May 09, 2019 ft²
Commitments And Contingencies [Line Items]
Letter of credit and performance obligations		$ 26,500
Notes receivable, net		0				$ 9,641
Proceeds from note receivable		10,000	$ 0
Property insurance program per occurrence limits		1,000,000
Per occurrence limit for NBCR Coverage		1,000,000
Value of program trigger		$ 200,000
Coinsurance of program trigger		20.00%
Program trigger deductible		20.00%
Per occurrence limit of the earthquake insurance which covers San Francisco and Los Angeles regions		$ 330,000
Annual aggregate limit of the earthquake insurance which covers San Francisco and Los Angeles regions		330,000
Amount of earthquake insurance provided by IXP, LLC as direct insurer San Francisco and Los Angeles		$ 30,000
Deductible in insurance as a percentage of the value of the affected property, San Francisco and Los Angeles		3.00%
Per Occurrence Limit of Earthquake Insurance Seattle		$ 110,000
Annual Aggregate Limit of Earthquake Insurance Seattle		$ 110,000
Earthquake Deductible Insurance Percentage of Value of the Affected Property Seattle		2.00%
Affiliate of Bernstein Companies [Member]
Commitments And Contingencies [Line Items]
Notes receivable, net					$ 10,000
Proceeds from note receivable	$ 10,000
Note receivable fixed interest rate					8.00%
Proceeds from Interest Received	$ 1,600
Boston Properties Limited Partnership
Commitments And Contingencies [Line Items]
Notes receivable, net		$ 0				$ 9,641
Proceeds from note receivable		10,000	$ 0
Operating partnership guarantee to cover liabilities of IXP		20,000
767 Venture, LLC [Member]
Commitments And Contingencies [Line Items]
Maximum funding obligation		14,900
Property insurance program per occurrence limits		1,625,000
325 Main Street
Commitments And Contingencies [Line Items]
Net Rentable Area (in sf) | ft²				414,000			115,000
601 Lexington Avenue
Commitments And Contingencies [Line Items]
Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP		1,350,000
Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP - Property and Terrorism		750,000
Coverage For Acts Of Terrorism Under TRIA Covered in Excess of Amount Covered by IXP - Terrorism		600,000
Sum of Coverage Covered by IXP and Excess Coverage for Property and Terrorism		$ 1,750,000
Future Residential Building [Member] | 325 Main Street
Commitments And Contingencies [Line Items]
Net Rentable Area (in sf) | ft²		200,000
Affordable Housing requirement		25.00%
Home Ownership Units [Member] | Future Residential Building [Member] | 325 Main Street
Commitments And Contingencies [Line Items]
Affordable Housing requirement		20.00%

XML

Noncontrolling Interests (Narrative) (Details) - Boston Properties Limited Partnership	Sep. 30, 2022 shares
OP Units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding	16,535,172
LTIP Units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding	1,680,123
2012 OPP and 2013-2019 MYLTIP
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding	464,036
MYLTIP 2020 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding	203,278
MYLTIP 2021
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding	351,218
MYLTIP 2022
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding	253,627

XML

(Common Units) (Narrative) (Details) $ / shares in Units, $ in Thousands			9 Months Ended
	Feb. 04, 2022 USD ($) shares	Feb. 01, 2022 USD ($)	Sep. 30, 2022 USD ($) yr $ / shares shares	Dec. 31, 2021 USD ($)
Boston Properties Limited Partnership
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount | $			$ 1,407,762	$ 2,078,603
MYLTIP | Boston Properties Limited Partnership
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Vesting Period			3 years
Unvested MYLTIP Units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
unvested MYLTIP distributions as compared to total distributions (percentage)			10.00%
MYLTIP 2019 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Final awards percentage of target	69.00%
Value of MYLTIP Awards | $	$ 8,600
Forfeitures, in units	144,043
MYLTIP 2020 [Member] | Boston Properties Limited Partnership
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding			203,278
MYLTIP 2021 | Boston Properties Limited Partnership
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding			351,218
MYLTIP 2022
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Value of MYLTIP Awards | $		$ 17,300
Vesting Period		3 years
MYLTIP 2022 | Boston Properties Limited Partnership
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding			253,627
OP Units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
OP Units for redemption (in shares)			178,929
Restriction on redemption of OP Unit to Common Stock (in years) | yr			1
Redemption of OP Unit equivalent to Common Stock (in shares)			1
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount | $			$ 1,400,000
Closing price of common stock (in dollars per share) | $ / shares			$ 74.97
Vested 2012 OPP units and MYLTIPS
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
OP Units for redemption (in shares)			74,249

XML

Noncontrolling Interests Common Units Distributions (Details) - $ / shares	Jul. 29, 2022	Apr. 29, 2022	Jan. 28, 2022	Oct. 29, 2021	Jul. 30, 2021	Apr. 30, 2021	Jan. 28, 2021	Sep. 16, 2022
Dividends Payable [Line Items]
Distributions Payable, Amount Per Unit								$ 0.98
Dividends, Per Unit, Cash Paid	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98
Boston Properties Limited Partnership
Dividends Payable [Line Items]
Distributions Payable, Amount Per Unit								0.98
Dividends, Per Unit, Cash Paid	0.98	0.98	0.98	0.98	0.98	0.98	0.98
Boston Properties Limited Partnership | Op units and LTIP units
Dividends Payable [Line Items]
Distributions Payable, Amount Per Unit								0.98
Dividends, Per Unit, Cash Paid	0.98	0.98	0.98	0.98	0.98	0.98	0.98
Boston Properties Limited Partnership | Unvested MYLTIP Units [Member]
Dividends Payable [Line Items]
Distributions Payable, Amount Per Unit								$ 0.098
Dividends, Per Unit, Cash Paid	$ 0.098	$ 0.098	$ 0.098	$ 0.098	$ 0.098	$ 0.098	$ 0.098

XML

Noncontrolling Interests (Property Partnerships) (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Noncontrolling Interest [Line Items]
Noncontrolling Interest in Limited Partnerships	$ 1,551,501	$ 1,556,553

XML

Stockholders' Equity / Partners' Capital Narrative (Details) $ / shares in Units, $ in Thousands					3 Months Ended		9 Months Ended
	Apr. 01, 2021	Mar. 31, 2021 USD ($)	Mar. 02, 2021 $ / shares shares	May 22, 2020 USD ($) yr	Sep. 30, 2022 USD ($) shares	Sep. 30, 2021 USD ($) shares	Sep. 30, 2022 USD ($) shares	Sep. 30, 2021 USD ($) shares	Dec. 31, 2021 shares	Jun. 02, 2017 USD ($)
Class of Stock [Line Items]
Common Stock, Shares, Outstanding					156,754,712	156,206,000	156,754,712	156,206,000	156,544,849
General Partners' Capital Account, Units Outstanding (in units)					1,749,700		1,749,700
Limited Partners' Capital Account, Units Outstanding (in units)					155,005,012		155,005,012
Options exercised							0
Shares of Common Stock issued in connection with redemption of an equal number of OP Units (in shares)							178,929
Preferred Stock Redemption Premium | $					$ 0	$ 0	$ 0	$ 6,412
ATM Program [Member]
Class of Stock [Line Items]
At The Market Stock Offering Program Aggregate Value Of Common Stock | $				$ 600,000						$ 600,000
At Market Stock Offering Program Maximum Length Of Sale (in years) | yr				3
Series B Cumulative Redeemable Preferred Stock / Unit [Member]
Class of Stock [Line Items]
Series B, Shares Outstanding (in shares)			80,000
Series B, Dividend Rate, Percentage			5.25%
Preferred Stock, Redemption Price Per Share | $ / shares			$ 2,500
Preferred Stock Redemption Price Per Share, plus accrued and unpaid dividends | $ / shares			$ 2,516.41
Preferred Stock Redemption Premium | $		$ 6,400
Preferred Stock, Redemption Date	Apr. 01, 2021

XML

Stockholders' Equity / Partners' Capital Dividends / Distributions (Details) - $ / shares	Jul. 29, 2022	Apr. 29, 2022	Jan. 28, 2022	Oct. 29, 2021	Jul. 30, 2021	Apr. 30, 2021	Feb. 16, 2021	Jan. 28, 2021	Sep. 16, 2022
Dividends / Distributions [Line Items]
Dividends Payable, Amount Per Share / Unit									$ 0.98
Common Stock / Unit, Dividends / Distributions, Per Share / Unit, Cash Paid	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98		$ 0.98
Boston Properties Limited Partnership
Dividends / Distributions [Line Items]
Dividends Payable, Amount Per Share / Unit									0.98
Common Stock / Unit, Dividends / Distributions, Per Share / Unit, Cash Paid	0.98	0.98	0.98	0.98	0.98	0.98		0.98
Boston Properties Limited Partnership | Op units and LTIP units
Dividends / Distributions [Line Items]
Dividends Payable, Amount Per Share / Unit									0.98
Common Stock / Unit, Dividends / Distributions, Per Share / Unit, Cash Paid	0.98	0.98	0.98	0.98	0.98	0.98		0.98
Boston Properties Limited Partnership | Unvested MYLTIP Units [Member]
Dividends / Distributions [Line Items]
Dividends Payable, Amount Per Share / Unit									$ 0.098
Common Stock / Unit, Dividends / Distributions, Per Share / Unit, Cash Paid	$ 0.098	$ 0.098	$ 0.098	$ 0.098	$ 0.098	$ 0.098		$ 0.098
Series B Cumulative Redeemable Preferred Stock / Unit [Member]
Dividends / Distributions [Line Items]
Common Stock / Unit, Dividends / Distributions, Per Share / Unit, Cash Paid							$ 32.8125

XML

Segment Information Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022
Parking and Other [Member]
Segment Reporting Information [Line Items]
Increase (decrease) in parking and other revenue primarily related to COVID-19	$ 4,600	$ 21,500

XML

Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the company's common shareholders / unitholders	$ 360,977,000	$ 108,297,000	$ 727,144,000	$ 311,680,000
Preferred Stock Redemption Charge	0	0	0	(6,412,000)
Preferred dividends / distributions	0	0	0	(2,560,000)
Noncontrolling interest-common units of the Operating Partnership	(40,883,000)	(11,982,000)	(82,821,000)	(35,393,000)
Noncontrolling interest in property partnerships	(18,801,000)	(18,971,000)	(54,896,000)	(52,602,000)
Interest expense	(111,846,000)	(105,794,000)	(317,216,000)	(320,015,000)
Loss from early extinguishment of debt	0	0	0	898,000
Company's share of net operating income from joint ventures	(488,908,000)	(458,729,000)	(1,442,266,000)	(1,355,845,000)
Loss from unconsolidated joint ventures	3,524,000	5,597,000	1,389,000	1,745,000
Depreciation and amortization expense	(190,675,000)	(179,412,000)	(551,445,000)	(539,815,000)
Transaction costs	(1,650,000)	(1,888,000)	(2,146,000)	(2,970,000)
General and administrative expense	(32,519,000)	(34,560,000)	(110,378,000)	(117,924,000)
Gains (losses) from investments in securities	1,571,000	190,000	8,549,000	(3,744,000)
Other Income - assignment fee	0	0	(6,624,000)	0
Interest and other income (loss)	(3,728,000)	(1,520,000)	(6,151,000)	(4,140,000)
Gains on sales of real estate	(262,345,000)	(348,000)	(381,293,000)	(8,104,000)
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the company's common shareholders / unitholders	360,977,000	108,297,000	727,144,000	311,680,000
Preferred Stock Redemption Charge	0	0	0	6,412,000
Preferred dividends / distributions	0	0	0	2,560,000
Noncontrolling interest-common units of the Operating Partnership	40,883,000	11,982,000	82,821,000	35,393,000
Noncontrolling interest in property partnerships	18,801,000	18,971,000	54,896,000	52,602,000
Interest expense	111,846,000	105,794,000	317,216,000	320,015,000
Loss from early extinguishment of debt	0	0	0	898,000
Loss from unconsolidated joint ventures	(3,524,000)	(5,597,000)	(1,389,000)	(1,745,000)
Depreciation and amortization expense	190,675,000	179,412,000	551,445,000	539,815,000
Transaction costs	1,650,000	1,888,000	2,146,000	2,970,000
Operating expense	3,900,000	3,006,000	11,204,000	9,166,000
General and administrative expense	32,519,000	34,560,000	110,378,000	117,924,000
Gains (losses) from investments in securities	(1,571,000)	(190,000)	(8,549,000)	3,744,000
Other Income - assignment fee	0	0	6,624,000	0
Interest and other income (loss)	3,728,000	1,520,000	6,151,000	4,140,000
Gains on sales of real estate	262,345,000	348,000	381,293,000	8,104,000
Other revenue	3,900,000	3,006,000	11,204,000	9,166,000
Company's share of Net Operating Income	475,918,000	435,195,000	1,407,390,000	1,291,860,000
Unconsolidated Joint Ventures [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest expense	(40,678,000)	(27,519,000)	(103,270,000)	(78,711,000)
Loss from early extinguishment of debt	0	0	1,327,000	0
Loss from unconsolidated joint ventures	3,524,000	5,597,000	1,389,000	1,745,000
Depreciation and amortization expense	(44,132,000)	(36,036,000)	(132,089,000)	(103,766,000)
Transaction costs	65,000	0	(746,000)	(7,000)
Unconsolidated Joint Ventures [Member] | Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Company's share of net operating income from joint ventures	35,316,000	24,266,000	108,347,000	74,478,000
Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the company's common shareholders / unitholders	403,578,000	122,014,000	819,195,000	353,633,000
Preferred Stock Redemption Charge	0	0	0	(6,412,000)
Preferred dividends / distributions	0	0	0	(2,560,000)
Noncontrolling interest in property partnerships	(18,801,000)	(18,971,000)	(54,896,000)	(52,602,000)
Interest expense	(111,846,000)	(105,794,000)	(317,216,000)	(320,015,000)
Loss from early extinguishment of debt	0	0	0	898,000
Loss from unconsolidated joint ventures	3,524,000	5,597,000	1,389,000	1,745,000
Depreciation and amortization expense	(188,969,000)	(177,677,000)	(546,271,000)	(533,255,000)
Transaction costs	(1,650,000)	(1,888,000)	(2,146,000)	(2,970,000)
General and administrative expense	(32,519,000)	(34,560,000)	(110,378,000)	(117,924,000)
Gains (losses) from investments in securities	1,571,000	190,000	8,549,000	(3,744,000)
Other Income - assignment fee	0	0	(6,624,000)	0
Interest and other income (loss)	(3,728,000)	(1,520,000)	(6,151,000)	(4,140,000)
Gains on sales of real estate	(262,357,000)	(348,000)	(385,349,000)	(8,104,000)
Boston Properties Limited Partnership | Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the company's common shareholders / unitholders	403,578,000	122,014,000	819,195,000	353,633,000
Preferred Stock Redemption Charge	0	0		6,412,000
Preferred dividends / distributions	0	0	0	2,560,000
Noncontrolling interest in property partnerships	18,801,000	18,971,000	54,896,000	52,602,000
Interest expense	111,846,000	105,794,000	317,216,000	320,015,000
Loss from early extinguishment of debt	0	0	0	898,000
Loss from unconsolidated joint ventures	(3,524,000)	(5,597,000)	(1,389,000)	(1,745,000)
Depreciation and amortization expense	188,969,000	177,677,000	546,271,000	533,255,000
Transaction costs	1,650,000	1,888,000	2,146,000	2,970,000
Operating expense	3,900,000	3,006,000	11,204,000	9,166,000
General and administrative expense	32,519,000	34,560,000	110,378,000	117,924,000
Gains (losses) from investments in securities	(1,571,000)	(190,000)	(8,549,000)	3,744,000
Other Income - assignment fee	0	0	6,624,000	0
Interest and other income (loss)	3,728,000	1,520,000	6,151,000	4,140,000
Gains on sales of real estate	262,357,000	348,000	385,349,000	8,104,000
Other revenue	3,900,000	3,006,000	11,204,000	9,166,000
Company's share of Net Operating Income	475,918,000	435,195,000	1,407,390,000	1,291,860,000
Management Service [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	(7,465,000)	(6,094,000)	(19,650,000)	(20,181,000)
Management Service [Member] | Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	7,465,000	6,094,000	19,650,000	20,181,000
Management Service [Member] | Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	(7,465,000)	(6,094,000)	(19,650,000)	(20,181,000)
Management Service [Member] | Boston Properties Limited Partnership | Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	7,465,000	6,094,000	19,650,000	20,181,000
Noncontrolling interest - property partnerships [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Company's share of net operating income from joint ventures	48,306,000	47,800,000	143,223,000	138,463,000
Noncontrolling interest - property partnerships [Member] | Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Company's share of net operating income from joint ventures	48,306,000	47,800,000	143,223,000	138,463,000
Noncontrolling interest - property partnerships [Member] | Boston Properties Limited Partnership | Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Company's share of net operating income from joint ventures	$ 48,306,000	$ 47,800,000	$ 143,223,000	$ 138,463,000

XML

Segment Information (Schedule Of Segment Reporting By Geographic Area And Property Type) (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2022		Sep. 30, 2021	Sep. 30, 2022		Sep. 30, 2021
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	[1]	$ 753,069		$ 704,873	$ 2,215,290		$ 2,090,997
Rental Revenue: Residential	[1]	14,340		10,894	44,218		29,832
Rental Revenue Total	[1]	$ 779,158		$ 720,956	$ 2,287,903		$ 2,128,211
Rental Revenue: % of Grand Totals		100.00%		100.00%	100.00%		100.00%
Rental Expenses: Class A Office		$ 274,678		$ 252,236	$ 802,531		$ 746,273
Rental Expenses: Residential		7,024		6,045	23,274		18,100
Rental Expenses: Total		$ 290,250		$ 262,227	$ 845,637		$ 772,366
Rental Expenses: % Of Grand Totals		100.00%		100.00%	100.00%		100.00%
Net Operating Income		$ 488,908		$ 458,729	$ 1,442,266		$ 1,355,845
Net Operating Income: % of Grand Totals		100.00%		100.00%	100.00%		100.00%
Company's Share of Net Operating Income: % of Grand Totals		100.00%		100.00%	100.00%		100.00%
Boston [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	[1]	$ 255,958		$ 236,080	$ 742,972		$ 696,054
Rental Revenue: Residential	[1]	3,837		3,418	11,181		9,594
Rental Revenue Total	[1]	$ 271,544		$ 244,687	$ 782,548		$ 713,030
Rental Revenue: % of Grand Totals		34.85%		33.93%	34.20%		33.50%
Rental Expenses: Class A Office		$ 91,226		$ 82,697	$ 268,781		$ 240,743
Rental Expenses: Residential		1,552		1,396	4,481		4,286
Rental Expenses: Total		$ 101,326		$ 88,039	$ 293,094		$ 253,022
Rental Expenses: % Of Grand Totals		34.91%		33.57%	34.66%		32.76%
Net Operating Income		$ 170,218		$ 156,648	$ 489,454		$ 460,008
Net Operating Income: % of Grand Totals		34.81%		34.15%	33.94%		33.93%
Company's Share of Net Operating Income: % of Grand Totals		35.12%		34.30%	34.18%		33.88%
Los Angeles [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	[1]	$ 0		$ 0	$ 0		$ 0
Rental Revenue: Residential	[1]	0		0	0		0
Rental Revenue Total	[1]	$ 0		$ 0	$ 0		$ 0
Rental Revenue: % of Grand Totals		0.00%		0.00%	0.00%		0.00%
Rental Expenses: Class A Office		$ 0		$ 0	$ 0		$ 0
Rental Expenses: Residential		0		0	0		0
Rental Expenses: Total		$ 0		$ 0	$ 0		$ 0
Rental Expenses: % Of Grand Totals		0.00%		0.00%	0.00%		0.00%
Net Operating Income		$ 0		$ 0	$ 0		$ 0
Net Operating Income: % of Grand Totals		0.00%		0.00%	0.00%		0.00%
Company's Share of Net Operating Income: % of Grand Totals		2.76%		2.78%	2.85%		2.98%
New York [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	[1]	$ 260,926		$ 257,656	$ 772,060		$ 760,002
Rental Revenue: Residential	[1]	0		0	0		0
Rental Revenue Total	[1]	$ 260,926		$ 257,656	$ 772,060		$ 760,002
Rental Revenue: % of Grand Totals		33.49%		35.74%	33.75%		35.71%
Rental Expenses: Class A Office		$ 99,942		$ 94,338	$ 291,645		$ 286,385
Rental Expenses: Residential		0		0	0		0
Rental Expenses: Total		$ 99,942		$ 94,338	$ 291,645		$ 286,385
Rental Expenses: % Of Grand Totals		34.43%		35.98%	34.49%		37.08%
Net Operating Income		$ 160,984		$ 163,318	$ 480,415		$ 473,617
Net Operating Income: % of Grand Totals		32.93%		35.60%	33.31%		34.93%
Company's Share of Net Operating Income: % of Grand Totals		25.99%		29.06%	26.38%		28.35%
San Francisco [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	[1]	$ 134,938		$ 125,340	$ 401,020		$ 382,119
Rental Revenue: Residential	[1]	3,133		806	11,374		1,817
Rental Revenue Total	[1]	$ 138,071		$ 126,146	$ 412,394		$ 383,936
Rental Revenue: % of Grand Totals		17.72%		17.50%	18.02%		18.04%
Rental Expenses: Class A Office		$ 47,068		$ 43,582	$ 135,677		$ 124,785
Rental Expenses: Residential		2,125		1,688	9,138		4,918
Rental Expenses: Total		$ 49,193		$ 45,270	$ 144,815		$ 129,703
Rental Expenses: % Of Grand Totals		16.95%		17.26%	17.12%		16.79%
Net Operating Income		$ 88,878		$ 80,876	$ 267,579		$ 254,233
Net Operating Income: % of Grand Totals		18.18%		17.63%	18.55%		18.75%
Company's Share of Net Operating Income: % of Grand Totals		19.35%		19.39%	19.69%		20.50%
Seattle
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office		$ 12,293	[1]	$ 0	$ 18,765	[1]	$ 0
Rental Revenue: Residential		0	[1]	0	0	[1]	0
Rental Revenue Total		$ 12,293	[1]	$ 0	$ 18,765	[1]	$ 0
Rental Revenue: % of Grand Totals		1.58%		0.00%	0.82%		0.00%
Rental Expenses: Class A Office		$ 3,125		$ 0	$ 4,805		$ 0
Rental Expenses: Residential		0		0	0		0
Rental Expenses: Total		$ 3,125		$ 0	$ 4,805		$ 0
Rental Expenses: % Of Grand Totals		1.08%		0.00%	0.57%		0.00%
Net Operating Income		$ 9,168		$ 0	$ 13,960		$ 0
Net Operating Income: % of Grand Totals		1.88%		0.00%	0.97%		0.00%
Company's Share of Net Operating Income: % of Grand Totals		2.34%		0.15%	1.41%		0.05%
Washington, DC [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	[1]	$ 88,954		$ 85,797	$ 280,473		$ 252,822
Rental Revenue: Residential	[1]	7,370		6,670	21,663		18,421
Rental Revenue Total	[1]	$ 96,324		$ 92,467	$ 302,136		$ 271,243
Rental Revenue: % of Grand Totals		12.36%		12.83%	13.21%		12.75%
Rental Expenses: Class A Office		$ 33,317		$ 31,619	$ 101,623		$ 94,360
Rental Expenses: Residential		3,347		2,961	9,655		8,896
Rental Expenses: Total		$ 36,664		$ 34,580	$ 111,278		$ 103,256
Rental Expenses: % Of Grand Totals		12.63%		13.19%	13.16%		13.37%
Net Operating Income		$ 59,660		$ 57,887	$ 190,858		$ 167,987
Net Operating Income: % of Grand Totals		12.20%		12.62%	13.23%		12.39%
Company's Share of Net Operating Income: % of Grand Totals		14.44%		14.32%	15.49%		14.24%
Hotel [Member]
Segment Reporting Information [Line Items]
Other revenue	[1]	$ 11,749		$ 5,189	$ 28,395		$ 7,382
Operating expense		8,548		3,946	19,832		7,993
Hotel [Member] | Boston [Member]
Segment Reporting Information [Line Items]
Other revenue	[1]	11,749		5,189	28,395		7,382
Operating expense		8,548		3,946	19,832		7,993
Hotel [Member] | Los Angeles [Member]
Segment Reporting Information [Line Items]
Other revenue	[1]	0		0	0		0
Operating expense		0		0	0		0
Hotel [Member] | New York [Member]
Segment Reporting Information [Line Items]
Other revenue	[1]	0		0	0		0
Operating expense		0		0	0		0
Hotel [Member] | San Francisco [Member]
Segment Reporting Information [Line Items]
Other revenue	[1]	0		0	0		0
Operating expense		0		0	0		0
Hotel [Member] | Seattle
Segment Reporting Information [Line Items]
Other revenue		0	[1]	0	0	[1]	0
Operating expense		0		0	0		0
Hotel [Member] | Washington, DC [Member]
Segment Reporting Information [Line Items]
Other revenue	[1]	0		0	0		0
Operating expense		0		0	0		0
Noncontrolling interest - property partnerships [Member]
Segment Reporting Information [Line Items]
Net Operating Income		(48,306)		(47,800)	(143,223)		(138,463)
Noncontrolling interest - property partnerships [Member] | Boston [Member]
Segment Reporting Information [Line Items]
Net Operating Income		(11,293)		(10,841)	(34,405)		(31,641)
Noncontrolling interest - property partnerships [Member] | Los Angeles [Member]
Segment Reporting Information [Line Items]
Net Operating Income		0		0	0		0
Noncontrolling interest - property partnerships [Member] | New York [Member]
Segment Reporting Information [Line Items]
Net Operating Income		(37,013)		(36,959)	(108,818)		(106,822)
Noncontrolling interest - property partnerships [Member] | San Francisco [Member]
Segment Reporting Information [Line Items]
Net Operating Income		0		0	0		0
Noncontrolling interest - property partnerships [Member] | Seattle
Segment Reporting Information [Line Items]
Net Operating Income		0		0	0		0
Noncontrolling interest - property partnerships [Member] | Washington, DC [Member]
Segment Reporting Information [Line Items]
Net Operating Income		0		0	0		0
Unconsolidated Joint Ventures [Member] | Boston [Member]
Segment Reporting Information [Line Items]
Net Operating Income		8,169		3,464	25,996		9,369
Unconsolidated Joint Ventures [Member] | Los Angeles [Member]
Segment Reporting Information [Line Items]
Net Operating Income		13,143		12,078	40,147		38,535
Unconsolidated Joint Ventures [Member] | New York [Member]
Segment Reporting Information [Line Items]
Net Operating Income		(259)		104	(397)		(517)
Unconsolidated Joint Ventures [Member] | San Francisco [Member]
Segment Reporting Information [Line Items]
Net Operating Income		3,233		3,502	9,597		10,562
Unconsolidated Joint Ventures [Member] | Seattle
Segment Reporting Information [Line Items]
Net Operating Income		1,978		671	5,877		671
Unconsolidated Joint Ventures [Member] | Washington, DC [Member]
Segment Reporting Information [Line Items]
Net Operating Income		9,052		4,447	27,127		15,858
Company's Share [Member]
Segment Reporting Information [Line Items]
Net Operating Income		475,918		435,195	1,407,390		1,291,860
Company's Share [Member] | Boston [Member]
Segment Reporting Information [Line Items]
Net Operating Income		167,094		149,271	481,045		437,736
Company's Share [Member] | Los Angeles [Member]
Segment Reporting Information [Line Items]
Net Operating Income		13,143		12,078	40,147		38,535
Company's Share [Member] | New York [Member]
Segment Reporting Information [Line Items]
Net Operating Income		123,712		126,463	371,200		366,278
Company's Share [Member] | San Francisco [Member]
Segment Reporting Information [Line Items]
Net Operating Income		92,111		84,378	277,176		264,795
Company's Share [Member] | Seattle
Segment Reporting Information [Line Items]
Net Operating Income		11,146		671	19,837		671
Company's Share [Member] | Washington, DC [Member]
Segment Reporting Information [Line Items]
Net Operating Income		$ 68,712		$ 62,334	$ 217,985		$ 183,845

[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.

XML

Earnings Per Share / Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Basic Earnings:
Net income attributable to the company's common shareholders / unitholders	$ 360,977	$ 108,297	$ 727,144	$ 311,680
Net income attributable to the company's common shareholders / unitholders (in shares / units)	156,754,000	156,183,000	156,708,000	156,062,000
Net income attributable to the company's common shareholders / unitholders (in dollars per share / unit)	$ 2.30		$ 4.64
Allocation of undistributed earnings to participating securities	$ (762)		$ (1,002)
Allocation of undistributed earnings to participating securities (in shares / units)	0		0
Allocation of undistributed earnings to participating securities (in dollars per share / unit)	$ 0		$ (0.01)
Net Income Available To Common Stockholders After Allocation of Undistributed Earnings to Participating Securities Basic	$ 360,215	$ 108,297	$ 726,142	$ 311,680
Weighted Average Number Of Shares Outstanding After Allocation of Undistributed Earnings to Participating Securities Basic (in shares)	156,754,000	156,183,000	156,708,000	156,062,000
Earnings Per Share After Allocation of Undistributed Earnings to Participating Securities Basic (dollars per share)	$ 2.30	$ 0.69	$ 4.63	$ 2.00
Effect of Dilutive Securities:
Stock Based Compensation	$ 0	$ 0	$ 0	$ 0
Stock Based Compensation (in shares / units)	379,000	415,000	436,000	332,000
Weighted Average Number Diluted Shares Outstanding Adjustment (per share)	$ (0.01)	$ 0	$ (0.01)	$ (0.01)
Diluted Earnings:
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders	$ 360,215	$ 108,297	$ 726,142	$ 311,680
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders (in shares / units)	157,133,000	156,598,000	157,144,000	156,394,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit)	$ 2.29	$ 0.69	$ 4.62	$ 1.99
Boston Properties Limited Partnership
Redeemable Common Units	17,662,000	17,011,000	17,631,000	17,016,000
Basic Earnings:
Net income attributable to the company's common shareholders / unitholders	$ 403,578	$ 122,014	$ 819,195	$ 353,633
Net income attributable to the company's common shareholders / unitholders (in shares / units)	174,416,000	173,194,000	174,339,000	173,078,000
Net income attributable to the company's common shareholders / unitholders (in dollars per share / unit)	$ 2.31		$ 4.70	$ 2.04
Allocation of undistributed earnings to participating securities	$ (848)		$ (1,115)
Allocation of undistributed earnings to participating securities (in shares / units)	0		0
Allocation of undistributed earnings to participating securities (in dollars per share / unit)	$ 0		$ (0.01)
Net Income Available To Common Stockholders After Allocation of Undistributed Earnings to Participating Securities Basic	$ 402,730	$ 122,014	$ 818,080	$ 353,633
Weighted Average Number Of Shares Outstanding After Allocation of Undistributed Earnings to Participating Securities Basic (in shares)	174,416,000	173,194,000	174,339,000	173,078,000
Earnings Per Share After Allocation of Undistributed Earnings to Participating Securities Basic (dollars per share)	$ 2.31	$ 0.70	$ 4.69	$ 2.04
Effect of Dilutive Securities:
Stock Based Compensation	$ 0	$ 0	$ 0	$ 0
Stock Based Compensation (in shares / units)	379,000	415,000	436,000	332,000
Weighted Average Number Diluted Shares Outstanding Adjustment (per share)	$ (0.01)	$ 0	$ (0.01)	$ 0
Diluted Earnings:
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders	$ 402,730	$ 122,014	$ 818,080	$ 353,633
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders (in shares / units)	174,795,000	173,609,000	174,775,000	173,410,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit)	$ 2.30	$ 0.70	$ 4.68	$ 2.04

XML

Stock Option and Incentive Plan (Narrative) (Details) - MYLTIP 2022 $ in Millions	Feb. 01, 2022 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award	The 2022 MYLTIP awards consist of two, equally weighted (50% each) components that utilize BXP’s TSR over a three-year measurement period as the performance metric. The first component of the 2022 MYLTIP represents one-half (50%) of the target grant-date value of the award. 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 BXP’s three-year, annualized relative TSR performance compared to a custom index of peer companies. Under this component, 100% of the target number of LTIP Units will be earned if BXP’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%) of the target grant-date value of the 2022 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 BXP’s non-annualized, cumulative absolute TSR during the three-year performance period. Under this component, 100% of the target number of LTIP Units will be earned if BXP achieves an absolute TSR equal to +1,000 basis points; if BXP’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.
Distributions percent before measurement date	10.00%
Vesting Period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights	Earned awards (if any) will vest 100% on January 31, 2025, 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 BXP 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 January 31, 2025, earned awards will be calculated based on TSR performance up to the date of the change of control.
Value of MYLTIP Awards | $	$ 17.3
Minimum [Member] | Boston Properties Limited Partnership
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for issuance	0
Maximum [Member] | Boston Properties Limited Partnership
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for issuance	254,061
Target | Boston Properties Limited Partnership
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for issuance	127,031

XML

Stock Option and Incentive Plan Stock and Units (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		9 Months Ended
	Feb. 04, 2022	Feb. 01, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued			156,833,612		156,833,612		156,623,749
Stock based compensation expense			$ 7,700	$ 8,400	$ 43,200	$ 42,200
Common Stock, Value, Issued			$ 1,568		$ 1,568		$ 1,565
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued			41,818		41,818
LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value Of LTIP Units Issued					$ 29,900
Weighted average price (per unit)			$ 106.46		$ 106.46
Expected life assumed to calculate per unit fair value per LTIP unit (in years)					5 years 8 months 12 days
Risk-free rate					1.71%
Expected price volatility					31.00%
MYLTIP 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Final awards percentage of target	69.00%
Value of MYLTIP Awards	$ 8,600
Forfeitures, in units	144,043
MYLTIP 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of MYLTIP Awards		$ 17,300
Vesting Period		3 years
Boston Properties Limited Partnership | LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP units issued (in shares)			280,616		280,616
Boston Properties Limited Partnership | MYLTIP 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued					254,061
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee and director payment per share (in dollars per share)					$ 0.01
Common Stock, Value, Issued			$ 4,700		$ 4,700
Common Stock Weighted Average Price (in dollars per share)			$ 111.47		$ 111.47
LTIP and MYLTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee and director payment per share (in dollars per share)					$ 0.25
Ltips (including vested MYLTIPS) And Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expenses			$ 25,900		$ 25,900
Unvested MYLTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expenses			$ 7,300		$ 7,300
Weighted-average period (years)					2 years

XML

Subsequent Events (Details) $ in Thousands		9 Months Ended
	Oct. 25, 2022 USD ($) ft² floor	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Oct. 06, 2022 USD ($) ft² floor apartment
Subsequent Event [Line Items]
Payments to Acquire Equity Method Investments		$ 109,643	$ 95,462
Subsequent Event [Member] | 200 Fifth Avenue | Scenario, Plan | Unconsolidated Properties
Subsequent Event [Line Items]
Net Rentable Area (in sf) | ft²	870,000
Ownership Percentage	27.00%
Debt Instrument, Interest Rate, Stated Percentage	4.34%
Noncash or Part Noncash Acquisition, Value of Assets Acquired	$ 280,200
Assumption of mortgage notes payable	160,100
Payments to Acquire Equity Method Investments	$ 120,100
Number of floors | floor	14
Subsequent Event [Member] | The Avant at Reston Town Center | Residential Building
Subsequent Event [Line Items]
Net Rentable Area (in sf) | ft²				329,000
Number of Units in Real Estate Property | apartment				359
Number of floors | floor				15
Contractual Sales Price				$ 141,000
Subsequent Event [Member] | The Avant at Reston Town Center | Retail Site [Member]
Subsequent Event [Line Items]
Net Rentable Area (in sf) | ft²				26,000