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 June 30, 2023

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	156,864,549
(Registrant)	(Class)	(Outstanding on July 28, 2023)

EXPLANATORY NOTE

This report combines the Quarterly Reports on Form 10-Q for the period ended June 30, 2023 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 June 30, 2023, BXP owned an approximate 89.4% ownership interest in BPLP. The remaining approximate 10.6% interest was owned by limited partners. The other limited partners of BPLP (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 subsidiaries and 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 $246.4 million, or 1.3% at June 30, 2023, 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 10. Stockholders’ Equity / Partners’ Capital;

• Note 11. Segment Information; and

• Note 12. Earnings Per Share / Common Unit

• Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations and Liquidity and Capital Resources, includes information specific to each entity, 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 June 30, 2023

TABLE OF CONTENTS

		Page
PART I. FINANCIAL INFORMATION
ITEM 1.	Financial Statements (unaudited)	1
Boston Properties, Inc.
	a) Consolidated Balance Sheets as of June 30, 2023 and December 31, 2022	1
	b) Consolidated Statements of Operations for the three and six months ended June 30, 2023 and 2022	3
	c) Consolidated Statements of Comprehensive Income for the three and six months ended June 30, 2023 and 2022	4
	d) Consolidated Statements of Equity for the three and six months ended June 30, 2023 and 2022	5
	e) Consolidated Statements of Cash Flows for the six months ended June 30, 2023 and 2022	7
Boston Properties Limited Partnership
	a) Consolidated Balance Sheets as of June 30, 2023 and December 31, 2022	9
	b) Consolidated Statements of Operations for the three and six months ended June 30, 2023 and 2022	11
	c) Consolidated Statements of Comprehensive Income for the three and six months ended June 30, 2023 and 2022	12
	d) Consolidated Statements of Capital and Noncontrolling Interests for the three and six months ended June 30, 2023 and 2022	13
	e) Consolidated Statements of Cash Flows for the six months ended June 30, 2023 and 2022	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	44
ITEM 3.	Quantitative and Qualitative Disclosures about Market Risk	97
ITEM 4.	Controls and Procedures	98
PART II. OTHER INFORMATION
ITEM 1.	Legal Proceedings	99
ITEM 1A.	Risk Factors	99
ITEM 2.	Unregistered Sales of Equity Securities and Use of Proceeds	99
ITEM 3.	Defaults Upon Senior Securities	100
ITEM 4.	Mine Safety Disclosures	100
ITEM 5.	Other Information	100
ITEM 6.	Exhibits	101
SIGNATURES		102

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)
	June 30, 2023		December 31, 2022
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,870,107 and $6,789,029 at June 30, 2023 and December 31, 2022, respectively)	$	25,762,722	$	25,389,663
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at June 30, 2023 and December 31, 2022, respectively)	237,526		237,510
Right of use assets - operating leases	166,421		167,351
Less: accumulated depreciation (amounts related to VIEs of $(1,434,592) and $(1,381,401) at June 30, 2023 and December 31, 2022, respectively)	(6,568,568)		(6,298,082)
Total real estate	19,598,101		19,496,442
Cash and cash equivalents (amounts related to VIEs of $256,201 and $259,658 at June 30, 2023 and December 31, 2022, respectively)	1,581,575		690,333
Cash held in escrows	46,915		46,479
Investments in securities	33,481		32,277
Tenant and other receivables, net (amounts related to VIEs of $13,921 and $16,521 at June 30, 2023 and December 31, 2022, respectively)	91,968		81,389
Related party note receivable, net	88,834		78,576
Sales-type lease receivable, net	13,250		12,811
Accrued rental income, net (amounts related to VIEs of $382,622 and $367,138 at June 30, 2023 and December 31, 2022, respectively)	1,318,320		1,276,580
Deferred charges, net (amounts related to VIEs of $172,655 and $176,597 at June 30, 2023 and December 31, 2022, respectively)	710,820		733,282
Prepaid expenses and other assets (amounts related to VIEs of $13,534 and $11,647 at June 30, 2023 and December 31, 2022, respectively)	77,457		43,589
Investments in unconsolidated joint ventures	1,780,959		1,715,911
Total assets	$	25,341,680	$	24,207,669
LIABILITIES AND EQUITY
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $3,274,764 and $3,272,368 at June 30, 2023 and December 31, 2022, respectively)	$	3,274,764	$	3,272,368
Unsecured senior notes, net	10,985,395		10,237,968
Unsecured line of credit	—		—
Unsecured term loan, net	1,196,046		730,000
Lease liabilities - finance leases (amounts related to VIEs of $20,675 and $20,604 at June 30, 2023 and December 31, 2022, respectively)	251,874		249,335
Lease liabilities - operating leases	204,826		204,686
Accounts payable and accrued expenses (amounts related to VIEs of $57,852 and $29,466 at June 30, 2023 and December 31, 2022, respectively)	434,574		417,545
Dividends and distributions payable	171,465		170,643
Accrued interest payable	111,088		103,774
Other liabilities (amounts related to VIEs of $101,301 and $114,232 at June 30, 2023 and December 31, 2022, respectively)	418,813		450,918
Total liabilities	17,048,845		15,837,237
Commitments and contingencies (See Note 8)
Redeemable deferred stock units— 108,642 and 97,853 units outstanding at redemption value at June 30, 2023 and December 31, 2022, respectively	6,292		6,613

1

BOSTON PROPERTIES, INC. CONSOLIDATED BALANCE SHEETS (unaudited and in thousands, except for share and par value amounts)
	June 30, 2023		December 31, 2022
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, 156,932,300 and 156,836,767 issued and 156,853,400 and 156,757,867 outstanding at June 30, 2023 and December 31, 2022, respectively	1,569		1,568
Additional paid-in capital	6,561,161		6,539,147
Dividends in excess of earnings	(516,550)		(391,356)
Treasury common stock at cost, 78,900 shares at June 30, 2023 and December 31, 2022	(2,722)		(2,722)
Accumulated other comprehensive loss	(3,406)		(13,718)
Total stockholders’ equity attributable to Boston Properties, Inc.	6,040,052		6,132,919
Noncontrolling interests:
Common units of Boston Properties Limited Partnership	689,123		683,583
Property partnerships	1,557,368		1,547,317
Total equity	8,286,543		8,363,819
Total liabilities and equity	$	25,341,680	$	24,207,669

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 June 30,				Six months ended June 30,
	2023		2022		2023		2022
Revenue
Lease	$	761,733	$	721,899	$	1,518,608	$	1,440,019
Parking and other	26,984		30,346		50,993		52,080
Hotel	13,969		12,089		22,070		16,646
Development and management services	9,858		6,354		18,838		12,185
Direct reimbursements of payroll and related costs from management services contracts	4,609		3,239		9,844		7,304
Total revenue	817,153		773,927		1,620,353		1,528,234
Expenses
Operating
Rental	291,036		273,848		582,344		544,103
Hotel	8,161		6,444		14,832		11,284
General and administrative	44,175		34,665		99,977		77,859
Payroll and related costs from management services contracts	4,609		3,239		9,844		7,304
Transaction costs	308		496		1,219		496
Depreciation and amortization	202,577		183,146		411,311		360,770
Total expenses	550,866		501,838		1,119,527		1,001,816
Other income (expense)
Income (loss) from unconsolidated joint ventures	(6,668)		(54)		(14,237)		2,135
Gains on sales of real estate	—		96,247		—		118,948
Interest and other income (loss)	17,343		1,195		28,284		2,423
Other income - assignment fee	—		6,624		—		6,624
Gains (losses) from investments in securities	1,571		(4,716)		3,236		(6,978)
Unrealized gain on non-real estate investment	124		—		383		—
Interest expense	(142,473)		(104,142)		(276,680)		(205,370)
Net income	136,184		267,243		241,812		444,200
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnerships	(19,768)		(18,546)		(38,428)		(36,095)
Noncontrolling interest—common units of the Operating Partnership	(12,117)		(25,708)		(21,169)		(42,061)
Net income attributable to Boston Properties, Inc.	$	104,299	$	222,989	$	182,215	$	366,044
Basic earnings per common share attributable to Boston Properties, Inc.
Net income	$	0.67	$	1.42	$	1.16	$	2.33
Weighted average number of common shares outstanding	156,826		156,720		156,815		156,685
Diluted earnings per common share attributable to Boston Properties, Inc.
Net income	$	0.66	$	1.42	$	1.16	$	2.33
Weighted average number of common and common equivalent shares outstanding	157,218		157,192		157,131		157,098

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 June 30,				Six months ended June 30,
	2023		2022		2023		2022
Net income	$	136,184	$	267,243	$	241,812	$	444,200
Other comprehensive income:
Effective portion of interest rate contracts	14,965		35		8,427		7,600
Amortization of interest rate contracts (1)	1,674		1,677		3,349		3,353
Other comprehensive income	16,639		1,712		11,776		10,953
Comprehensive income	152,823		268,955		253,588		455,153
Net income attributable to noncontrolling interests	(31,885)		(44,254)		(59,597)		(78,156)
Other comprehensive income attributable to noncontrolling interests	(1,831)		(304)		(1,463)		(1,368)
Comprehensive income attributable to Boston Properties, Inc.	$	119,107	$	224,397	$	192,528	$	375,629

_______________

(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, March 31, 2023	156,830	$	1,568	$	6,549,314	$	(467,159)	$	(2,722)	$	(18,214)	$	691,627	$	1,552,070	$	8,306,484
Redemption of operating partnership units to common stock	16	1		598		—		—		—		(599)		—		—
Allocated net income for the period	—	—		—		104,325		—		—		12,091		19,768		136,184
Dividends/distributions declared	—	—		—		(153,716)		—		—		(18,376)		—		(172,092)
Net activity from stock option and incentive plan	8	—		(110)		—		—		—		14,052		—		13,942
Distributions to noncontrolling interests in property partnerships	—	—		—		—		—		—		—		(14,614)		(14,614)
Effective portion of interest rate contracts	—	—		—		—		—		13,435		1,530		—		14,965
Amortization of interest rate contracts	—	—		—		—		—		1,373		157		144		1,674
Reallocation of noncontrolling interest	—	—		11,359		—		—		—		(11,359)		—		—
Equity, June 30, 2023	156,854	$	1,569	$	6,561,161	$	(516,550)	$	(2,722)	$	(3,406)	$	689,123	$	1,557,368	$	8,286,543
Equity, March 31, 2022	156,712	$	1,567	$	6,509,663	$	(636,421)	$	(2,722)	$	(28,485)	$	649,602	$	1,548,455	$	8,041,659
Redemption of operating partnership units to common stock	11	—		401		—		—		—		(401)		—		—
Allocated net income for the period	—	—		—		222,997		—		—		25,700		18,546		267,243
Dividends/distributions declared	—	—		—		(153,592)		—		—		(17,939)		—		(171,531)
Net activity from stock option and incentive plan	3	—		4,420		—		—		—		13,605		—		18,025
Distributions to noncontrolling interests in property partnerships	—	—		—		—		—		—		—		(14,439)		(14,439)
Effective portion of interest rate contracts	—	—		—		—		—		31		4		—		35
Amortization of interest rate contracts	—	—		—		—		—		1,377		156		144		1,677
Reallocation of noncontrolling interest	—	—		10,513		—		—		—		(10,513)		—		—
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

5

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, December 31, 2022	156,758	$	1,568	$	6,539,147	$	(391,356)	$	(2,722)	$	(13,718)	$	683,583	$	1,547,317	$	8,363,819
Redemption of operating partnership units to common stock	21	1		793		—		—		—		(794)		—		—
Allocated net income for the period	—	—		—		182,215		—		—		21,169		38,428		241,812
Dividends/distributions declared	—	—		—		(307,409)		—		—		(36,737)		—		(344,146)
Shares issued pursuant to stock purchase plan	9	—		586		—		—		—		—		—		586
Net activity from stock option and incentive plan	66	—		3,338		—		—		—		38,023		—		41,361
Contributions from noncontrolling interests in property partnerships	—	—		—		—		—		—		—		7,555		7,555
Distributions to noncontrolling interests in property partnerships	—	—		—		—		—		—		—		(36,220)		(36,220)
Effective portion of interest rate contracts	—	—		—		—		—		7,565		862		—		8,427
Amortization of interest rate contracts	—	—		—		—		—		2,747		314		288		3,349
Reallocation of noncontrolling interest	—	—		17,297		—		—		—		(17,297)		—		—
Equity, June 30, 2023	156,854	$	1,569	$	6,561,161	$	(516,550)	$	(2,722)	$	(3,406)	$	689,123	$	1,557,368	$	8,286,543
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	152	2		5,427		—		—		—		(5,429)		—		—
Allocated net income for the period	—	—		—		366,044		—		—		42,061		36,095		444,200
Dividends/distributions declared	—	—		—		(307,169)		—		—		(35,859)		—		(343,028)
Shares issued pursuant to stock purchase plan	5	—		600		—		—		—		—		—		600
Net activity from stock option and incentive plan	24	—		4,287		—		—		—		32,659		—		36,946
Contributions from noncontrolling interests in property partnerships	—	—		—		—		—		—		—		849		849
Distributions to noncontrolling interests in property partnerships	—	—		—		—		—		—		—		(41,079)		(41,079)
Effective portion of interest rate contracts	—	—		—		—		—		6,831		769		—		7,600
Amortization of interest rate contracts	—	—		—		—		—		2,754		311		288		3,353
Reallocation of noncontrolling interest	—	—		16,953		—		—		—		(16,953)		—		—
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

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)
	Six months ended June 30,
	2023		2022
Cash flows from operating activities:
Net income	$	241,812	$	444,200
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	411,311		360,770
Amortization of right of use assets - operating leases	929		1,407
Non-cash compensation expense	41,524		36,195
Loss (income) from unconsolidated joint ventures	14,237		(2,135)
Distributions of net cash flow from operations of unconsolidated joint ventures	11,437		10,097
Losses (gains) from investments in securities	(3,236)		6,978
Allowance for current expected credit losses	264		(458)
Non-cash portion of interest expense	14,940		12,528
Other income - assignment fee	—		(6,624)
Gains on sales of real estate	—		(118,948)
Unrealized gain on non-real estate investment	(383)		—
Change in assets and liabilities:
Tenant and other receivables, net	3,721		10,167
Notes receivable, net	—		(152)
Accrued rental income, net	(42,965)		(48,901)
Prepaid expenses and other assets	(24,758)		6,326
Lease liabilities - operating leases	140		82
Accounts payable and accrued expenses	6,320		(18,636)
Accrued interest payable	7,314		2,036
Other liabilities	(21,773)		(37,732)
Tenant leasing costs	(47,651)		(40,561)
Total adjustments	371,371		172,439
Net cash provided by operating activities	613,183		616,639
Cash flows from investing activities:
Acquisitions of real estate	—		(727,835)
Construction in progress	(235,331)		(237,182)
Building and other capital improvements	(78,344)		(63,278)
Tenant improvements	(135,743)		(97,844)
Proceeds from sales of real estate	—		157,345
Proceeds from assignment fee	—		6,624
Capital contributions to unconsolidated joint ventures	(103,595)		(69,819)
Capital distributions from unconsolidated joint ventures	7,350		36,622
Investment in non-real estate investments	(733)		—
Issuance of related party note receivable	(10,500)		—
Proceeds from notes receivable	—		10,000
Investments in securities, net	2,032		5,197
Net cash used in investing activities	(554,864)		(980,170)

7

BOSTON PROPERTIES, INC. CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited and in thousands)
	Six months ended June 30,
	2023		2022
Cash flows from financing activities:
Proceeds from unsecured senior notes	747,727		—
Borrowings on unsecured line of credit	—		340,000
Repayments of unsecured line of credit	—		(320,000)
Borrowings on unsecured term loan	1,200,000		730,000
Repayment of unsecured term loan	(730,000)		—
Deferred financing costs	(12,339)		(2,230)
Net activity from equity transactions	(39)		(366)
Dividends and distributions	(343,325)		(341,951)
Contributions from noncontrolling interests in property partnerships	7,555		849
Distributions to noncontrolling interests in property partnerships	(36,220)		(41,079)
Net cash provided by financing activities	833,359		365,223
Net increase in cash and cash equivalents and cash held in escrows	891,678		1,692
Cash and cash equivalents and cash held in escrows, beginning of period	736,812		501,158
Cash and cash equivalents and cash held in escrows, end of period	$	1,628,490	$	502,850
Reconciliation of cash and cash equivalents and cash held in escrows:
Cash and cash equivalents, beginning of period	$	690,333	$	452,692
Cash held in escrows, beginning of period	46,479		48,466
Cash and cash equivalents and cash held in escrows, beginning of period	$	736,812	$	501,158
Cash and cash equivalents, end of period	$	1,581,575	$	456,491
Cash held in escrows, end of period	46,915		46,359
Cash and cash equivalents and cash held in escrows, end of period	$	1,628,490	$	502,850
Supplemental disclosures:
Cash paid for interest	$	273,214	$	216,409
Interest capitalized	$	21,153	$	27,819
Non-cash investing and financing activities:
Write-off of fully depreciated real estate	$	(85,878)	$	(65,435)
Change in real estate included in accounts payable and accrued expenses	$	25,562	$	40,655
Construction in progress, net deconsolidated	$	—	$	(11,316)
Investment in unconsolidated joint ventures recorded upon deconsolidation	$	—	$	11,316
Dividends and distributions declared but not paid	$	171,465	$	170,937
Conversions of noncontrolling interests to stockholders’ equity	$	794	$	5,429
Issuance of restricted securities to employees and non-employee directors	$	47,885	$	47,198

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)
	June 30, 2023		December 31, 2022
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,870,107 and $6,789,029 at June 30, 2023 and December 31, 2022, respectively)	$	25,396,457	$	25,022,149
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at June 30, 2023 and December 31, 2022, respectively)	237,526		237,510
Right of use assets - operating leases	166,421		167,351
Less: accumulated depreciation (amounts related to VIEs of $(1,434,592) and $(1,381,401) at June 30, 2023 and December 31, 2022, respectively)	(6,448,665)		(6,180,474)
Total real estate	19,351,739		19,246,536
Cash and cash equivalents (amounts related to VIEs of $256,201 and $259,658 at June 30, 2023 and December 31, 2022, respectively)	1,581,575		690,333
Cash held in escrows	46,915		46,479
Investments in securities	33,481		32,277
Tenant and other receivables, net (amounts related to VIEs of $13,921 and $16,521 at June 30, 2023 and December 31, 2022, respectively)	91,968		81,389
Related party note receivable, net	88,834		78,576
Sales-type lease receivable, net	13,250		12,811
Accrued rental income, net (amounts related to VIEs of $382,622 and $367,138 at June 30, 2023 and December 31, 2022, respectively)	1,318,320		1,276,580
Deferred charges, net (amounts related to VIEs of $172,655 and $176,597 at June 30, 2023 and December 31, 2022, respectively)	710,820		733,282
Prepaid expenses and other assets (amounts related to VIEs of $13,534 and $11,647 at June 30, 2023 and December 31, 2022, respectively)	77,457		43,589
Investments in unconsolidated joint ventures	1,780,959		1,715,911
Total assets	$	25,095,318	$	23,957,763
LIABILITIES AND CAPITAL
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $3,274,764 and $3,272,368 at June 30, 2023 and December 31, 2022, respectively)	$	3,274,764	$	3,272,368
Unsecured senior notes, net	10,985,395		10,237,968
Unsecured line of credit	—		—
Unsecured term loan, net	1,196,046		730,000
Lease liabilities - finance leases (amounts related to VIEs of $20,675 and $20,604 at June 30, 2023 and December 31, 2022, respectively)	251,874		249,335
Lease liabilities - operating leases	204,826		204,686
Accounts payable and accrued expenses (amounts related to VIEs of $57,852 and $29,466 at June 30, 2023 and December 31, 2022, respectively)	434,574		417,545
Dividends and distributions payable	171,465		170,643
Accrued interest payable	111,088		103,774
Other liabilities (amounts related to VIEs of $101,301 and $114,232 at June 30, 2023 and December 31, 2022, respectively)	418,813		450,918
Total liabilities	17,048,845		15,837,237
Commitments and contingencies (See Note 8)
Redeemable deferred stock units— 108,642 and 97,853 units outstanding at redemption value at June 30, 2023 and December 31, 2022, respectively	6,292		6,613

9

BOSTON PROPERTIES LIMITED PARTNERSHIP CONSOLIDATED BALANCE SHEETS (unaudited and in thousands, except for unit amounts)
	June 30, 2023		December 31, 2022
Noncontrolling interests:
Redeemable partnership units— 16,522,540 and 16,531,172 common units and 2,135,852 and 1,679,175 long term incentive units outstanding at redemption value at June 30, 2023 and December 31, 2022, respectively	1,135,053		1,280,886
Capital:
Boston Properties Limited Partnership partners’ capital— 1,755,118 and 1,749,682 general partner units and 155,098,282 and 155,008,185 limited partner units outstanding at June 30, 2023 and December 31, 2022, respectively	5,351,166		5,299,428
Accumulated other comprehensive loss	(3,406)		(13,718)
Total partners’ capital	5,347,760		5,285,710
Noncontrolling interests in property partnerships	1,557,368		1,547,317
Total capital	6,905,128		6,833,027
Total liabilities and capital	$	25,095,318	$	23,957,763

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 June 30,				Six months ended June 30,
	2023		2022		2023		2022
Revenue
Lease	$	761,733	$	721,899	$	1,518,608	$	1,440,019
Parking and other	26,984		30,346		50,993		52,080
Hotel	13,969		12,089		22,070		16,646
Development and management services	9,858		6,354		18,838		12,185
Direct reimbursements of payroll and related costs from management services contracts	4,609		3,239		9,844		7,304
Total revenue	817,153		773,927		1,620,353		1,528,234
Expenses
Operating
Rental	291,036		273,848		582,344		544,103
Hotel	8,161		6,444		14,832		11,284
General and administrative	44,175		34,665		99,977		77,859
Payroll and related costs from management services contracts	4,609		3,239		9,844		7,304
Transaction costs	308		496		1,219		496
Depreciation and amortization	200,895		181,416		407,767		357,302
Total expenses	549,184		500,108		1,115,983		998,348
Other income (expense)
Income (loss) from unconsolidated joint ventures	(6,668)		(54)		(14,237)		2,135
Gains on sales of real estate	—		99,608		—		122,992
Interest and other income (loss)	17,343		1,195		28,284		2,423
Other income - assignment fee	—		6,624		—		6,624
Gains (losses) from investments in securities	1,571		(4,716)		3,236		(6,978)
Unrealized gain on non-real estate investment	124		—		383		—
Interest expense	(142,473)		(104,142)		(276,680)		(205,370)
Net income	137,866		272,334		245,356		451,712
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnerships	(19,768)		(18,546)		(38,428)		(36,095)
Net income attributable to Boston Properties Limited Partnership	$	118,098	$	253,788	$	206,928	$	415,617
Basic earnings per common unit attributable to Boston Properties Limited Partnership
Net income	$	0.68	$	1.45	$	1.18	$	2.38
Weighted average number of common units outstanding	174,748		174,392		174,693		174,323
Diluted earnings per common unit attributable to Boston Properties Limited Partnership
Net income	$	0.67	$	1.45	$	1.18	$	2.38
Weighted average number of common and common equivalent units outstanding	175,140		174,864		175,009		174,736

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 June 30,				Six months ended June 30,
	2023		2022		2023		2022
Net income	$	137,866	$	272,334	$	245,356	$	451,712
Other comprehensive income:
Effective portion of interest rate contracts	14,965		35		8,427		7,600
Amortization of interest rate contracts (1)	1,674		1,677		3,349		3,353
Other comprehensive income	16,639		1,712		11,776		10,953
Comprehensive income	154,505		274,046		257,132		462,665
Comprehensive income attributable to noncontrolling interests	(19,912)		(18,690)		(38,716)		(36,383)
Comprehensive income attributable to Boston Properties Limited Partnership	$	134,593	$	255,356	$	218,416	$	426,282

_______________

(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, March 31, 2023	1,755	155,075	$	5,449,936	$	(18,214)	$	1,552,070	$	6,983,792	$	1,074,648
Net activity from contributions and unearned compensation	—	7	(110)		—		—		(110)		14,052
Allocated net income for the period	—	—	106,007		—		19,768		125,775		12,091
Distributions	—	—	(153,716)		—		—		(153,716)		(18,376)
Conversion of redeemable partnership units	—	16	599		—		—		599		(599)
Adjustment to reflect redeemable partnership units at redemption value	—	—	(51,550)		—		—		(51,550)		51,550
Effective portion of interest rate contracts	—	—	—		13,435		—		13,435		1,530
Amortization of interest rate contracts	—	—	—		1,373		144		1,517		157
Distributions to noncontrolling interests in property partnerships	—	—	—		—		(14,614)		(14,614)		—
Equity, June 30, 2023	1,755	155,098	$	5,351,166	$	(3,406)	$	1,557,368	$	6,905,128	$	1,135,053
Equity, March 31, 2022	1,749	154,962	$	3,914,832	$	(28,485)	$	1,548,455	$	5,434,802	$	2,347,834
Net activity from contributions and unearned compensation	1	4	4,418		—		—		4,418		13,607
Allocated net income for the period	—	—	228,088		—		18,546		246,634		25,700
Distributions	—	—	(153,592)		—		—		(153,592)		(17,939)
Conversion of redeemable partnership units	—	11	401		—		—		401		(401)
Adjustment to reflect redeemable partnership units at redemption value	—	—	722,283		—		—		722,283		(722,283)
Effective portion of interest rate contracts	—	—	—		31		—		31		4
Amortization of interest rate contracts	—	—	—		1,377		144		1,521		156
Distributions to noncontrolling interests in property partnerships	—	—	—		—		(14,439)		(14,439)		—
Equity, June 30, 2022	1,750	154,977	$	4,716,430	$	(27,077)	$	1,552,706	$	6,242,059	$	1,646,678

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)		Accumulated Other Comprehensive Loss		Noncontrolling Interests - Property Partnerships		Total Capital		Noncontrolling Interests - Redeemable Partnership Units
Equity, December 31, 2022	1,750	155,008	$	5,299,428	$	(13,718)	$	1,547,317	$	6,833,027	$	1,280,886
Net activity from contributions and unearned compensation	5	69	3,922		—		—		3,922		38,025
Allocated net income for the period	—	—	185,759		—		38,428		224,187		21,169
Distributions	—	—	(307,409)		—		—		(307,409)		(36,737)
Conversion of redeemable partnership units	—	21	794		—		—		794		(794)
Adjustment to reflect redeemable partnership units at redemption value	—	—	168,672		—		—		168,672		(168,672)
Effective portion of interest rate contracts	—	—	—		7,565		—		7,565		862
Amortization of interest rate contracts	—	—	—		2,747		288		3,035		314
Contributions from noncontrolling interests in property partnerships	—	—	—		—		7,555		7,555		—
Distributions to noncontrolling interests in property partnerships	—	—	—		—		(36,220)		(36,220)		—
Equity, June 30, 2023	1,755	155,098	$	5,351,166	$	(3,406)	$	1,557,368	$	6,905,128	$	1,135,053
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	29	4,885		—		—		4,885		32,661
Allocated net income for the period	—	—	373,556		—		36,095		409,651		42,061
Distributions	—	—	(307,169)		—		—		(307,169)		(35,859)
Conversion of redeemable partnership units	3	149	5,429		—		—		5,429		(5,429)
Adjustment to reflect redeemable partnership units at redemption value	—	—	466,439		—		—		466,439		(466,439)
Effective portion of interest rate contracts	—	—	—		6,831		—		6,831		769
Amortization of interest rate contracts	—	—	—		2,754		288		3,042		311
Contributions from noncontrolling interests in property partnerships	—	—	—		—		849		849		—
Distributions to noncontrolling interests in property partnerships	—	—	—		—		(41,079)		(41,079)		—
Equity, June 30, 2022	1,750	154,977	$	4,716,430	$	(27,077)	$	1,552,706	$	6,242,059	$	1,646,678

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)
	Six months ended June 30,
	2023		2022
Cash flows from operating activities:
Net income	$	245,356	$	451,712
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	407,767		357,302
Amortization of right of use assets - operating leases	929		1,407
Non-cash compensation expense	41,524		36,195
Loss (income) from unconsolidated joint ventures	14,237		(2,135)
Distributions of net cash flow from operations of unconsolidated joint ventures	11,437		10,097
Losses (gains) from investments in securities	(3,236)		6,978
Allowance for current expected credit losses	264		(458)
Non-cash portion of interest expense	14,940		12,528
Other income - assignment fee	—		(6,624)
Gains on sales of real estate	—		(122,992)
Unrealized gain on non-real estate investment	(383)		—
Change in assets and liabilities:
Tenant and other receivables, net	3,721		10,167
Note receivable, net	—		(152)
Accrued rental income, net	(42,965)		(48,901)
Prepaid expenses and other assets	(24,758)		6,326
Lease liabilities - operating leases	140		82
Accounts payable and accrued expenses	6,320		(18,636)
Accrued interest payable	7,314		2,036
Other liabilities	(21,773)		(37,732)
Tenant leasing costs	(47,651)		(40,561)
Total adjustments	367,827		164,927
Net cash provided by operating activities	613,183		616,639
Cash flows from investing activities:
Acquisitions of real estate	—		(727,835)
Construction in progress	(235,331)		(237,182)
Building and other capital improvements	(78,344)		(63,278)
Tenant improvements	(135,743)		(97,844)
Proceeds from sales of real estate	—		157,345
Proceeds from assignment fee	—		6,624
Capital contributions to unconsolidated joint ventures	(103,595)		(69,819)
Capital distributions from unconsolidated joint ventures	7,350		36,622
Investment in non-real estate investments	(733)		—
Issuance of related party note receivable	(10,500)		—
Proceeds from notes receivable	—		10,000
Investments in securities, net	2,032		5,197
Net cash used in investing activities	(554,864)		(980,170)

15

BOSTON PROPERTIES LIMITED PARTNERSHIP CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited and in thousands)
	Six months ended June 30,
	2023		2022
Cash flows from financing activities:
Proceeds from unsecured senior notes	747,727		—
Borrowings on unsecured line of credit	—		340,000
Repayments of unsecured line of credit	—		(320,000)
Borrowings on unsecured term loan	1,200,000		730,000
Repayment of unsecured term loan	(730,000)		—
Deferred financing costs	(12,339)		(2,230)
Net activity from equity transactions	(39)		(366)
Distributions	(343,325)		(341,951)
Contributions from noncontrolling interests in property partnerships	7,555		849
Distributions to noncontrolling interests in property partnerships	(36,220)		(41,079)
Net cash provided by financing activities	833,359		365,223
Net increase in cash and cash equivalents and cash held in escrows	891,678		1,692
Cash and cash equivalents and cash held in escrows, beginning of period	736,812		501,158
Cash and cash equivalents and cash held in escrows, end of period	$	1,628,490	$	502,850
Reconciliation of cash and cash equivalents and cash held in escrows:
Cash and cash equivalents, beginning of period	$	690,333	$	452,692
Cash held in escrows, beginning of period	46,479		48,466
Cash and cash equivalents and cash held in escrows, beginning of period	$	736,812	$	501,158
Cash and cash equivalents, end of period	$	1,581,575	$	456,491
Cash held in escrows, end of period	46,915		46,359
Cash and cash equivalents and cash held in escrows, end of period	$	1,628,490	$	502,850
Supplemental disclosures:
Cash paid for interest	$	273,214	$	216,409
Interest capitalized	$	21,153	$	27,819
Non-cash investing and financing activities:
Write-off of fully depreciated real estate	$	(84,629)	$	(65,435)
Change in real estate included in accounts payable and accrued expenses	$	25,562	$	40,655
Construction in progress, net deconsolidated	$	—	$	(11,316)
Investment in unconsolidated joint ventures recorded upon deconsolidation	$	—	$	11,316
Distributions declared but not paid	$	171,465	$	170,937
Conversions of redeemable partnership units to partners’ capital	$	794	$	5,429
Issuance of restricted securities to employees and non-employee directors	$	47,885	$	47,198

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 June 30, 2023 owned an approximate 89.4% (89.6% at December 31, 2022) 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 - 2023 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 - 2020 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 2021 - 2023 MYLTIP Units differ from other LTIP Units granted to employees (including the 2012 OPP Units and the 2013 - 2020 MYLTIP Units, which have been earned). Therefore, unless specifically noted otherwise, all references to LTIP Units exclude the 2021 - 2023 MYLTIP Units. LTIP Units (including the earned 2012 OPP Units and the earned 2013 - 2020 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 9 and 13).

Properties

At June 30, 2023, the Company owned or had joint venture interests in a portfolio of 191 commercial real estate properties (the “Properties”) aggregating approximately 54.1 million net rentable square feet of primarily premier workplaces, including 13 properties under construction/redevelopment totaling approximately 3.1 million net rentable square feet. At June 30, 2023, the Properties consisted of:

•170 office and life sciences properties (including 10 properties under construction/redevelopment);

•14 retail properties (including two properties under construction/redevelopment);

•six 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. 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, 2022.

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 assets of each VIE are only available to satisfy such VIE's respective liabilities. The Company has identified six entities that are VIEs as of June 30, 2023 and has determined that it is the primary beneficiary for all of these entities as of June 30, 2023.

Consolidated Variable Interest Entities

As of June 30, 2023, 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 9).

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.

Fair Value Measurements

The Company follows the authoritative guidance for fair value measurements.

The table below presents for June 30, 2023 and December 31, 2022, 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”).

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

_______________

(1)If trading volume 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.

In addition, 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, sales-type lease 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 June 30, 2023 and December 31, 2022 (in thousands):

	June 30, 2023				December 31, 2022
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Related party note receivable, net	$	88,834	$	90,500	$	78,576	$	79,220
Sales-type lease receivable, net	13,250		13,173		12,811		13,045
Total	$	102,084	$	103,673	$	91,387	$	92,265
Mortgage notes payable, net	$	3,274,764	$	2,765,657	$	3,272,368	$	2,744,479
Unsecured senior notes, net	10,985,395		9,751,688		10,237,968		9,135,512
Unsecured line of credit	—		—		—		—
Unsecured term loan, net	1,196,046		1,194,895		730,000		730,000
Total	$	15,456,205	$	13,712,240	$	14,240,336	$	12,609,991

In addition to the financial instruments noted above, the Company uses interest rate swap agreements to manage its interest rate risk (See Note 7). The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves. To comply with the provisions of ASC 820, the Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. However, as of June 30, 2023, the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.

The following table presents the aggregate fair value of the Company’s interest rate swaps as of June 30, 2023 and December 31, 2022 (in thousands):

Fair value	June 30, 2023		December 31, 2022
Interest rate swaps	$	6,445	$	—

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3. Real Estate

BXP

Real estate consisted of the following at June 30, 2023 and December 31, 2022 (in thousands):

	June 30, 2023		December 31, 2022
Land	$	5,189,287	$	5,189,811
Right of use assets - finance leases	237,526		237,510
Right of use assets - operating leases	166,421		167,351
Land held for future development (1)	637,191		721,501
Buildings and improvements	16,054,447		15,820,724
Tenant improvements	3,345,766		3,200,743
Furniture, fixtures and equipment	53,181		50,310
Construction in progress	482,850		406,574
Total	26,166,669		25,794,524
Less: Accumulated depreciation	(6,568,568)		(6,298,082)
	$	19,598,101	$	19,496,442

_______________

(1)Includes pre-development costs.

BPLP

Real estate consisted of the following at June 30, 2023 and December 31, 2022 (in thousands):

	June 30, 2023		December 31, 2022
Land	$	5,094,578	$	5,095,102
Right of use assets - finance leases	237,526		237,510
Right of use assets - operating leases	166,421		167,351
Land held for future development (1)	637,191		721,501
Buildings and improvements	15,782,891		15,547,919
Tenant improvements	3,345,766		3,200,743
Furniture, fixtures and equipment	53,181		50,310
Construction in progress	482,850		406,574
Total	25,800,404		25,427,010
Less: Accumulated depreciation	(6,448,665)		(6,180,474)
	$	19,351,739	$	19,246,536

_______________

(1)Includes pre-development costs.

Developments/Redevelopments

On January 5, 2023, the Company commenced the development of 290 Binney Street, an approximately 566,000 net rentable square foot laboratory/life sciences project in Cambridge, Massachusetts. Concurrent with the commencement of this project, the Kendall Center Blue Parking Garage was taken out of service and demolished to support the development of this project. 290 Binney Street is 100% pre-leased to AstraZeneca.

On January 30, 2023, the Company commenced the redevelopment of 300 Binney Street at Kendall Center in Cambridge, Massachusetts. 300 Binney Street consisted of an approximately 195,000 net rentable square foot premier workplace that is being redeveloped into approximately 236,000 net rentable square feet of laboratory/life sciences space. BXP and BPLP recognized approximately $11.0 million of depreciation expense during the six months ended June 30, 2023 associated with the acceleration of depreciation on the assets being removed from service and demolished as part of the redevelopment of the property. The project is 100% pre-leased to the Broad Institute.

On April 29, 2023, the Company completed and fully placed in-service 2100 Pennsylvania Avenue, a premier workplace project with approximately 476,000 net rentable square feet located in Washington, DC.

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On June 1, 2023, the Company completed and fully placed in-service its View Boston Observatory at The Prudential Center, a redevelopment of the top three floors of 800 Boylston Street - The Prudential Center, located in Boston, Massachusetts. View Boston Observatory at The Prudential Center consists of approximately 63,000 net rentable square feet of retail, including food and beverage, and observation space.

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 tenant creditworthiness, current economic trends, including the impact of the COVID-19 pandemic on tenants’ businesses, and changes in tenants’ payment patterns, on a lease-by-lease basis. If the Company determines that the accrued rent and/or accounts receivable balances are no longer probable of collection then the balances are written-off and the lease is recognized on a cash basis.

If applicable, 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 can be found in Note 5.

Lessor

The following table summarizes the components of lease revenue recognized under the Company’s operating and sales-type leases for the three and six months ended June 30, 2023 and 2022 and included within the Company's Consolidated Statements of Operations (in thousands):

	Three months ended June 30,				Six months ended June 30,
Lease Revenue	2023		2022		2023		2022
Fixed contractual payments	$	629,189	$	601,351	$	1,250,835	$	1,200,958
Variable lease payments	132,315		120,548		267,318		239,061
Sales-type lease income	229		—		455		—
	$	761,733	$	721,899	$	1,518,608	$	1,440,019

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5. Investments in Unconsolidated Joint Ventures

The investments in unconsolidated joint ventures consist of the following at June 30, 2023 and December 31, 2022:

					Carrying Value of Investment (1)
Entity	Properties	Nominal % Ownership			June 30, 2023		December 31, 2022
					(in thousands)
Square 407 Limited Partnership	Market Square North	50.00	%		$	(6,053)	$	(6,198)
BP/CRF Metropolitan Square LLC	Metropolitan Square	20.00	%		(37,654)		(37,629)
901 New York, LLC	901 New York Avenue	25.00	%	(2)	(12,150)		(12,493)
WP Project Developer LLC	Wisconsin Place Land and Infrastructure	33.33	%	(3)	31,398		31,971
500 North Capitol Venture LLC	500 North Capitol Street, NW	30.00	%		(8,559)		(9,185)
501 K Street LLC	1001 6th Street	50.00	%		43,443		42,922
Podium Developer LLC	The Hub on Causeway - Podium	50.00	%		44,542		46,839
Residential Tower Developer LLC	Hub50House	50.00	%		44,214		45,414
Hotel Tower Developer LLC	The Hub on Causeway - Hotel Air Rights	50.00	%		12,750		12,366
Office Tower Developer LLC	100 Causeway Street	50.00	%		59,550		59,716
1265 Main Office JV LLC	1265 Main Street	50.00	%		3,583		3,465
BNY Tower Holdings LLC	Dock 72	50.00	%	(4)	(13,511)		(19,921)
CA-Colorado Center, LLC	Colorado Center	50.00	%		235,846		233,862
7750 Wisconsin Avenue LLC	7750 Wisconsin Avenue	50.00	%		50,789		52,152
BP-M 3HB Venture LLC	3 Hudson Boulevard	25.00	%		115,878		116,397
SMBP Venture LP	Santa Monica Business Park	55.00	%		161,368		164,735
Platform 16 Holdings LP	Platform 16	55.00	%	(5)	184,642		158,109
Gateway Portfolio Holdings LLC	Gateway Commons	50.00	%		349,055		324,038
Rosecrans-Sepulveda Partners 4, LLC	Beach Cities Media Campus	50.00	%		27,013		27,000
Safeco Plaza REIT LLC	Safeco Plaza	33.67	%	(6)	70,331		69,785
360 PAS Holdco LLC	360 Park Avenue South	42.21	%	(7)	112,219		114,992
PR II/BXP Reston Gateway LLC	Reston Next Residential	20.00	%		11,796		11,351
751 Gateway Holdings LLC	751 Gateway	49.00	%		89,025		80,714
200 Fifth Avenue JV LLC	200 Fifth Avenue	26.69	%		116,335		120,083
ABXP Worldgate Investments LLC	13100 and 13150 Worldgate Drive	50.00	%		17,182		N/A
					$	1,703,032	$	1,630,485

 _______________

(1)Investments with deficit balances aggregating approximately $77.9 million and $85.4 million at June 30, 2023 and December 31, 2022, 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 June 30, 2023 and December 31, 2022, 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)This property includes net equity balances from the amenity joint venture.

(5)At December 31, 2022, this entity was a VIE.

(6)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.

(7)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.

22

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: 

	June 30, 2023		December 31, 2022
	(in thousands)
ASSETS
Real estate and development in process, net (1)	$	6,748,400	$	6,537,554
Other assets	779,220		756,786
Total assets	$	7,527,620	$	7,294,340
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY
Mortgage and notes payable, net	$	4,056,181	$	4,022,746
Other liabilities (2)	724,078		716,271
Members’/Partners’ equity	2,747,361		2,555,323
Total liabilities and members’/partners’ equity	$	7,527,620	$	7,294,340
Company’s share of equity	$	1,301,827	$	1,238,929
Basis differentials (3)	401,205		391,556
Carrying value of the Company’s investments in unconsolidated joint ventures (4)	$	1,703,032	$	1,630,485

_______________

(1)At June 30, 2023 and December 31, 2022, this amount included right of use assets - finance leases totaling approximately $248.9 million. At June 30, 2023 and December 31, 2022, this amount included right of use assets - operating leases totaling approximately $20.6 million and $21.2 million, respectively.

(2)At June 30, 2023 and December 31, 2022, this amount included lease liabilities - finance leases totaling approximately $379.7 million and $382.2 million, respectively. At June 30, 2023 and December 31, 2022, this amount included lease liabilities - operating leases totaling approximately $30.5 million.

(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:

	June 30, 2023		December 31, 2022
Property	(in thousands)
Colorado Center	$	300,370	$	301,820
200 Fifth Avenue	96,837		94,497
Gateway Commons	48,078		47,808
Dock 72	(97,232)		(98,980)

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 $77.9 million and $85.4 million at June 30, 2023 and December 31, 2022, respectively, are reflected within Other Liabilities in the Company’s Consolidated Balance Sheets.

23

The combined summarized statements of operations of the Company’s unconsolidated joint ventures are as follows: 

	Three months ended June 30,				Six months ended June 30,
	2023		2022		2023		2022
	(in thousands)
Total revenue (1)	$	164,771	$	120,871	$	316,194	$	245,362
Expenses
Operating	61,023		45,353		118,229		90,994
Transaction costs	27		811		101		811
Depreciation and amortization	51,233		43,293		101,211		87,957
Total expenses	112,283		89,457		219,541		179,762
Other income (expense)
Loss from early extinguishment of debt	(3)		—		(3)		(1,327)
Interest expense	(58,799)		(32,219)		(116,049)		(62,592)
Unrealized gain on derivative instruments	14,457		—		3,847		—
Net income (loss)	$	8,143	$	(805)	$	(15,552)	$	1,681
Company’s share of net income (loss)	$	639	$	1,082	$	(6,263)	$	4,476
Basis differential (2)	(7,307)		(1,136)		(7,974)		(2,341)
Income (loss) from unconsolidated joint ventures	$	(6,668)	$	(54)	$	(14,237)	$	2,135

_______________ 

(1)Includes straight-line rent adjustments of approximately $6.9 million and $17.8 million for the three months ended June 30, 2023 and 2022, respectively, and approximately $13.2 million and $45.3 million for the six months ended June 30, 2023 and 2022, respectively.

(2)Includes straight-line rent adjustments of approximately $0.4 million and $0.1 million for the three months ended June 30, 2023 and 2022, respectively, and approximately $0.7 million and $0.2 million for the six months ended June 30, 2023 and 2022, respectively. Also includes net above-/below-market rent adjustments of approximately $0.2 million and $0.1 million for the three months ended June 30, 2023 and 2022, respectively, and approximately $0.4 million and $0.2 million for the six months ended June 30, 2023 and 2022.

On January 31, 2023, the Company acquired a 50% interest in a joint venture that owns 13100 and 13150 Worldgate Drive located in Herndon, Virginia for a gross purchase price of approximately $17.0 million. The acquisition was completed with available cash. 13100 and 13150 Worldgate Drive consists of two vacant office buildings aggregating approximately 350,000 rentable square feet and a 1,200-space structured parking deck situated on a 10-acre site. The joint venture intends to redevelop the property for residential use. There can be no assurance that the joint venture will commence the development as currently contemplated or at all.

On April 21, 2023, a joint venture in which the Company owns a 50% interest exercised an option to extend the maturity date of the construction loan collateralized by its 7750 Wisconsin Avenue property. Prior to the extension, the loan had a total commitment amount of approximately $252.6 million, bore interest at a variable rate equal to London interbank offered rate (“LIBOR”) plus 1.25% per annum and was scheduled to mature on April 26, 2023, with two, one-year extension options, subject to certain conditions. The extended loan continued to bear interest at LIBOR plus 1.25% per annum through June 1, 2023 after which, the interest rate was converted to a variable rate equal to Term Secured Overnight Finance Rate (“SOFR”) plus 1.35% per annum. The extended loan now matures on April 26, 2024, with a one-year extension option, subject to certain conditions. 7750 Wisconsin Avenue is a premier workplace with approximately 734,000 net rentable square feet located in Bethesda, Maryland.

On June 5, 2023, a joint venture in which the Company owns a 30% interest repaid the existing construction loan collateralized by its 500 North Capitol Street, NW property and obtained new mortgage loans with related parties. At the time of the pay off, the outstanding balance of the loan totaled approximately $105.0 million and the loan was scheduled to mature on June 6, 2023. The new mortgage loans have an aggregate principal balance of $105.0 million, bear interest at a weighted average fixed rate of 6.83% per annum and mature on June 5, 2026. The Company’s portion of the mortgage loans, $10.5 million, has been reflected as a Related Party Note

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Receivable on the Company’s Consolidated Balance Sheets. 500 North Capitol Street, NW is an approximately 231,000 net rentable square foot premier workplace in Washington, DC.

On June 28, 2023, a joint venture in which the Company owns a 25% interest exercised an option to extend by 30 days the maturity date of the loan collateralized by its 3 Hudson Boulevard property. At the time of the modification, the outstanding balance of the loan totaled $80.0 million, bore interest at a variable rate equal to LIBOR plus 3.50% per annum and was scheduled to mature on July 13, 2023, with two extension options (30 days and 180 days, respectively), subject to certain conditions. The modified loan continued to bear interest at a variable rate equal to LIBOR plus 3.50% per annum for the period from June 28, 2023 through July 6, 2023. As of June 30, 2023, the loan had approximately $23.2 million of accrued interest due at the maturity date, August 13, 2023. For the period commencing on July 7, 2023 through the maturity date, the modified loan will bear interest at a variable rate equal to Term SOFR plus approximately 3.61% per annum. The modified loan now matures on August 13, 2023, with one 180 days extension option, subject to certain conditions. 3 Hudson Boulevard consists of land and improvements held for future development located in New York, New York.

During the three months ended June 30, 2023, a joint venture in which the Company has a 55% interest elected to pause vertical construction on Platform 16 in San Jose, California. Platform 16 was planned to be constructed in phases to best accommodate market demand. The first phase of the development project included the construction of an approximately 390,000 net rentable square foot premier workplace building and below-grade parking garage. The joint venture intends to complete the construction of the below-grade parking garage and building foundation elements over the next several months to facilitate a restart of construction in the future as demand improves.

6. Debt

Unsecured Senior Notes

The following summarizes the unsecured senior notes outstanding as of June 30, 2023 (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
5 Year Unsecured Senior Notes	6.750	%	6.924	%	750,000		December 1, 2027
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
10.7 Year Unsecured Senior Notes	6.500	%	6.619	%	750,000		January 15, 2034
Total principal					11,050,000
Less:
Net unamortized discount					14,831
Deferred financing costs, net					49,774
Total					$	10,985,395

_______________

(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.

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On May 15, 2023, BPLP completed a public offering of $750.0 million in aggregate principal amount of its 6.500% unsecured senior notes due 2034. The notes were priced at 99.697% of the principal amount to yield an effective rate (including financing fees) of approximately 6.619% per annum to maturity. The notes will mature on January 15, 2034, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $741.3 million after deducting underwriting discounts and transaction expenses.

The indenture relating to the unsecured senior notes contains certain financial restrictions and requirements, including (1) a leverage ratio not to exceed 60%, (2) a secured debt leverage ratio not to exceed 50%, (3) an interest coverage ratio of greater than 1.50, and (4) an unencumbered asset value of not less than 150% of unsecured debt. At June 30, 2023, BPLP was in compliance with each of these financial restrictions and requirements.

Unsecured Credit Facility

On June 1, 2023, BPLP amended its unsecured credit facility (as amended, the “2021 Credit Facility”) to replace the LIBOR-based daily floating rate option with a SOFR-based daily floating rate option and to add options for SOFR-based term floating rates and rates for alternative currency loans. In addition, the amendment added a SOFR credit spread adjustment of 0.10%. Other than the foregoing, the material terms of the 2021 Credit Facility remain unchanged.

The 2021 Credit Facility provides for borrowings of up to $1.5 billion through BPLP’s revolving facility (the “Revolving Facility”), subject to customary conditions. The 2021 Credit Facility matures on June 15, 2026 and includes 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.

At BPLP’s option, loans under the 2021 Credit Facility will bear interest at a rate per annum equal to (1) (a) in the case of loans denominated in Dollars, Term SOFR and SOFR, (b) in the case of loans denominated in Euro, EURIBOR, (c) in the case of loans denominated in Canadian Dollars, CDOR, and (d) in the case of loans denominated in Sterling, SONIA, in each case, plus a margin ranging from 70.0 to 140.0 basis points based on BPLP’s credit rating or (2) an alternate base rate equal to the greatest 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%, in each case, plus a margin ranging from 0 to 40 basis points based on BPLP’s credit rating.

The 2021 Credit Facility also features a sustainability-linked pricing component such that if BPLP meets certain sustainability performance targets, the applicable per annum interest rate will be reduced by one basis point. In addition, the 2021 Credit Facility contains a competitive bid option for up to 65% of the Revolving Facility that allows banks that are part of the lender consortium to bid to make loan advances to BPLP at a reduced interest rate.

Pursuant to the 2021 Credit Facility, BPLP is obligated to pay (1) in quarterly installments a facility fee on the total commitment under the Revolving Facility at a rate per annum ranging from 0.10% to 0.30% based on BPLP’s credit rating and (2) an annual fee on the undrawn amount of each letter of credit ranging from 0.70% to 1.40% based on BPLP’s credit rating.

Based on BPLP’s June 30, 2023 credit rating, (1) the applicable Daily SOFR, Term SOFR, alternative currency daily rate, and alternative currency term 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 June 30, 2023, BPLP had no amount outstanding under the Revolving Facility.

Unsecured Term Loan

On January 4, 2023, BPLP entered into a credit agreement that provided for a $1.2 billion unsecured term loan facility (the “2023 Unsecured Term Loan”). Under the credit agreement, BPLP may, at any time prior to the maturity date, increase total commitments by up to an additional $300.0 million in aggregate principal amount by increasing the existing 2023 Unsecured Term Loan or incurring one or more additional term loans, in each case, subject to syndication of the increase and other conditions. The 2023 Unsecured Term Loan matures on May 16, 2024, with one 12-month extension option, subject to customary conditions. Upon entry into the credit agreement, BPLP exercised its option to draw $1.2 billion under the 2023 Unsecured Term Loan, a portion of which was used to repay in full the $730.0 million outstanding under its prior unsecured credit agreement (the “2022 Unsecured Term Loan”), which was scheduled to mature on May 16, 2023. There was no prepayment penalty associated with the

26

repayment of the 2022 Unsecured Term Loan.

At BPLP’s option, loans under the 2023 Unsecured Term Loan will bear interest at a rate per annum equal to (1) a base rate equal to the greatest of (a) the Federal Funds rate plus 0.5%, (b) the administrative agent’s prime rate, (c) Term SOFR for a one-month period plus 1.00%, and (d) 1.00%, in each case, plus a margin ranging from 0 to 60 basis points based on BPLP’s credit rating; or (2) a rate equal to adjusted Term SOFR with a one-month period plus a margin ranging from 75 to 160 basis points based on BPLP’s credit rating. Based on BPLP’s credit rating upon entry into the credit agreement, the base rate margin is 0 basis points and the Term SOFR margin is 0.85%. As of June 30, 2023, the 2023 Unsecured Term Loan bears interest at a rate equal to adjusted Term SOFR plus 0.85% (see Note 7). At June 30, 2023, BPLP had $1.2 billion outstanding under the 2023 Unsecured Term Loan.

2021 Credit Facility and 2023 Unsecured Term Loan Compliance

The agreements governing the 2021 Credit Facility and 2023 Unsecured Term Loan contain 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, in the case of the 2021 Credit Facility, all outstanding amounts and the cancellation of all commitments outstanding under the 2021 Credit Facility and, in the case of the 2023 Unsecured Term Loan, any outstanding amount under the 2023 Unsecured Term Loan. Among other covenants, the 2021 Credit Facility and the 2023 Unsecured Term Loan require 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 June 30, 2023, BPLP was in compliance with each of these financial and other covenant requirements.

7. Derivative Instruments and Hedging Activities

On May 2, 2023, BPLP entered into four interest rate swap contracts with notional amounts aggregating $1.2 billion. BPLP entered into these interest rate swap contracts to reduce its exposure to the variability in future cash flows attributable to changes in the 2023 Unsecured Term Loan interest rate. These interest rate swaps were entered into to fix Term SOFR, the reference rate for BPLP’s 2023 Unsecured Term Loan, at a weighted-average rate of 4.6420% for the period commencing on May 4, 2023 and ending on May 16, 2024 (see Note 6). For the period from May 4, 2023 through June 30, 2023, the Company recognized approximately $(0.9) million of interest expense related to its interest rate swap contracts.

BPLP assesses the effectiveness of its hedges both at inception and on an ongoing basis. If the hedges are deemed to be effective, the fair value is recorded in “Accumulated other comprehensive loss” in the Company’s Consolidated Balance Sheets and is subsequently reclassified into “Interest expense” in the Company’s Consolidated Statements of Operations in the period that the hedged forecasted transactions affect earnings. BPLP’s derivative financial instruments are cash flow hedges that are designated as effective hedges, and are carried at their estimated fair value on a recurring basis (See Note 2). The Company did not incur any ineffectiveness during the three months ended June 30, 2023.

BPLP’s interest rate swap contracts consisted of the following at June 30, 2023 (dollars in thousands):

Derivative Instrument	Aggregate Notional Amount				Strike Rate Range					Balance Sheet Location
			Effective Date	Maturity Date	Low			High			Fair Value
Interest Rate Swaps	$	1,200,000	May 4, 2023	May 16, 2024	4.638	%	—	4.646	%	Prepaid expenses and other assets	$	6,445

The following table presents the location in the financial statements of the gains or losses recognized related to the Company’s cash flow hedges for the three and six months ended June 30, 2023 and 2022 (dollars in thousands):

27

	Three months ended June 30,				Six months ended June 30,
	2023		2022		2023		2022
Amount of gain (loss) related to the effective portion recognized in other comprehensive income (1)	$	14,965	$	35	$	8,427	$	7,600
Amount of gain (loss) related to the effective portion subsequently reclassified to earnings (2)	$	1,674	$	1,677	$	3,349	$	3,353
Amount of gain (loss) relate do the ineffective portion and amount excluded from effectiveness testing	$	—	$	—	$	—	$	—

_______________

(1)Includes the Company’s share of gain (loss) related to the effective portion of derivatives outstanding at its unconsolidated joint venture properties.

(2)Consists of amounts from previous interest rate programs.

BPLP has formally documented all of its relationships between hedge instruments and hedging items, as well as its risk-management objectives and strategy for undertaking various hedge transactions. While management believes its judgments are reasonable, a change in a derivative's effectiveness as a hedge could materially affect expenses, net income (loss) and equity.

BPLP’s agreements with the swap derivative counterparties contain provisions whereby if BPLP defaults on the underlying indebtedness, including defaults where repayment of the indebtedness has not been accelerated by the lender, then BPLP could also be declared in default of the swap derivative obligation. As of June 30, 2023, the Company had not posted any collateral related to the agreements.

8. Commitments and Contingencies

General

In the normal course of business, the Company guarantees its performance of services or indemnifies third parties against its negligence. In addition, in the normal course of business, the Company guarantees to certain tenants the obligations of its subsidiaries for the payment of tenant improvement allowances and brokerage commissions in connection with their leases and limited costs arising from delays in delivery of their premises. 

The Company had letter of credit and performance obligations related to lender and development requirements that total approximately $21.6 million at June 30, 2023.

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, tenants 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 June 30, 2023, the maximum funding obligation under the guarantee was approximately $11.2 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 June 30, 2023, no amounts related to the guarantee were recorded as liabilities in the Company’s consolidated financial statements.

In connection with the development of the Company’s 290 Binney Street project located in Cambridge, Massachusetts, which commenced on January 5, 2023 (see Note 3), the Cambridge Zoning Ordinance requires that

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a building permit for the construction of a residential project of at least 400,000 square feet be issued prior to or concurrently with the issuance of a building permit for the commercial building. 290 Binney Street and the residential project are components of the Company’s future life sciences development project located in the heart of Kendall Square in Cambridge, Massachusetts. When completed the Company expects the project will consist of two premier workplace properties aggregating approximately 1.1 million rentable square feet of life sciences space and the approximately 400,000 square foot residential building. The commencement of construction of each phase of the overall project is 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 of the remaining phases on the terms and schedule currently contemplated or at all.

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 5% 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

29

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.

9. 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 June 30, 2023, the noncontrolling interests in BPLP consisted of 16,522,540 OP Units, 2,135,852 LTIP Units (including 514,715 LTIP Units earned by employees under the Company’s multi-year long-term incentive awards granted between 2012 and 2020 (i.e., 2012 OPP and 2013 - 2020 MYLTIP awards)), 349,267 2021 MYLTIP Units, 252,151 2022 MYLTIP Units and 322,053 2023 MYLTIP Units held by parties other than BXP.

Noncontrolling Interest—Common Units

During the six months ended June 30, 2023, 21,346 OP Units were presented by the holders for redemption (including an aggregate of 21,346 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 June 30, 2023, BPLP had outstanding 349,267 2021 MYLTIP Units, 252,151 2022 MYLTIP Units and 322,053 2023 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 - 2023 MYLTIP, 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 - 2023 MYLTIP Units.

On February 3, 2023, the measurement period for the Company’s 2020 MYLTIP awards ended and, based on BXP’s relative TSR performance, the final payout was determined to be 50% of target, or an aggregate of approximately $3.8 million (after giving effect to employee separations). As a result, an aggregate of 152,460 2020 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 - 2019 MYLTIP Units and, after the February 3, 2023 measurement date, the 2020 MYLTIP Units) and its distributions on the 2020 MYLTIP Units (prior to the February 3, 2023 measurement date) and 2021 - 2023 MYLTIP Units (after the February 7, 2023 issuance date of the 2023 MYLTIP Units) that occurred during the six months ended June 30, 2023:

Record Date	Payment Date	Distributions per OP Unit and LTIP Unit	Distributions per MYLTIP Unit
June 30, 2023	July 31, 2023	$0.98	$0.098
March 31, 2023	April 28, 2023	$0.98	$0.098
December 30, 2022	January 30, 2023	$0.98	$0.098

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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 six months ended June 30, 2022:

Record Date	Payment Date	Distributions per OP Unit and LTIP Unit	Distributions per MYLTIP Unit
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

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 - 2020 MYLTIP Units), assuming in each case that all conditions had been met for the conversion thereof, had all of such units been redeemed at June 30, 2023 was approximately $1.1 billion based on the last reported price of a share of Common Stock on the New York Stock Exchange of $57.59 per share on June 30, 2023.

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 and $1.5 billion at June 30, 2023 and December 31, 2022, respectively, are included in Noncontrolling Interests—Property Partnerships on the accompanying Consolidated Balance Sheets.

10. Stockholders’ Equity / Partners’ Capital

As of June 30, 2023, BXP had 156,853,400 shares of Common Stock outstanding.

As of June 30, 2023, BXP owned 1,755,118 general partnership units and 155,098,282 limited partnership units in BPLP.

On May 17, 2023, 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 May 22, 2023. 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 six months ended June 30, 2023, BXP did not issue any shares of Common Stock upon the exercise of options to purchase Common Stock. As a result of the applicable exercise period ending, 103,641 options were forfeited during the six months ended June 30, 2023. As of June 30, 2023, BXP no longer has any outstanding options.

During the six months ended June 30, 2023, BXP issued 21,346 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 2023 and during the six months ended June 30, 2022:

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Record Date	Payment Date	Dividend (Per Share)	Distribution (Per Unit)
June 30, 2023	July 31, 2023	$0.98	$0.98
March 31, 2023	April 28, 2023	$0.98	$0.98
December 30, 2022	January 30, 2023	$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

11. Segment Information

The following tables present reconciliations of Net Income Attributable to Boston Properties, Inc. to the Company’s share of Net Operating Income and Net Income Attributable to Boston Properties Limited Partnership to the Company’s share of Net Operating Income for the three and six months ended June 30, 2023 and 2022.

BXP

	Three months ended June 30,				Six months ended June 30,
	2023		2022		2023		2022
	(in thousands)
Net income attributable to Boston Properties, Inc.	$	104,299	$	222,989	$	182,215	$	366,044
Add:
Noncontrolling interest—common units of the Operating Partnership	12,117		25,708		21,169		42,061
Noncontrolling interests in property partnerships	19,768		18,546		38,428		36,095
Interest expense	142,473		104,142		276,680		205,370
Net operating income from unconsolidated joint ventures	42,254		35,710		83,010		73,031
Depreciation and amortization expense	202,577		183,146		411,311		360,770
Transaction costs	308		496		1,219		496
Payroll and related costs from management services contracts	4,609		3,239		9,844		7,304
General and administrative expense	44,175		34,665		99,977		77,859
Less:
Net operating income attributable to noncontrolling interests in property partnerships	47,958		47,862		95,055		94,917
Unrealized gain on non-real estate investment	124		—		383		—
Gains (losses) from investments in securities	1,571		(4,716)		3,236		(6,978)
Other income - assignment fee	—		6,624		—		6,624
Interest and other income (loss)	17,343		1,195		28,284		2,423
Gains on sales of real estate	—		96,247		—		118,948
Income (loss) from unconsolidated joint ventures	(6,668)		(54)		(14,237)		2,135
Direct reimbursements of payroll and related costs from management services contracts	4,609		3,239		9,844		7,304
Development and management services revenue	9,858		6,354		18,838		12,185
Company’s share of Net Operating Income	$	497,785	$	471,890	$	982,450	$	931,472

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BPLP

	Three months ended June 30,				Six months ended June 30,
	2023		2022		2023		2022
	(in thousands)
Net income attributable to Boston Properties Limited Partnership	$	118,098	$	253,788	$	206,928	$	415,617
Add:
Noncontrolling interests in property partnerships	19,768		18,546		38,428		36,095
Interest expense	142,473		104,142		276,680		205,370
Net operating income from unconsolidated joint ventures	42,254		35,710		83,010		73,031
Depreciation and amortization expense	200,895		181,416		407,767		357,302
Transaction costs	308		496		1,219		496
Payroll and related costs from management services contracts	4,609		3,239		9,844		7,304
General and administrative expense	44,175		34,665		99,977		77,859
Less:
Net operating income attributable to noncontrolling interests in property partnerships	47,958		47,862		95,055		94,917
Unrealized gain on non-real estate investment	124		—		383		—
Gains (losses) from investments in securities	1,571		(4,716)		3,236		(6,978)
Other income - assignment fee	—		6,624		—		6,624
Interest and other income (loss)	17,343		1,195		28,284		2,423
Gains on sales of real estate	—		99,608		—		122,992
Income (loss) from unconsolidated joint ventures	(6,668)		(54)		(14,237)		2,135
Direct reimbursements of payroll and related costs from management services contracts	4,609		3,239		9,844		7,304
Development and management services revenue	9,858		6,354		18,838		12,185
Company’s share of Net Operating Income	$	497,785	$	471,890	$	982,450	$	931,472

Net operating income (“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, depreciation and amortization expense, transaction costs, payroll and related costs from management services contracts and corporate general and administrative expense less (2) unrealized gain on non-real estate investment, gains (losses) from investments in securities, other income - assignment fee, interest and other income (loss), gains on sales of real estate, income (loss) from unconsolidated joint ventures, 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. 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 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

33

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, as defined above, also does not include its share of losses from early extinguishment of debt from unconsolidated joint ventures and unrealized gain on derivative instruments, 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. Interest expense, depreciation and amortization expense, transaction costs, payroll and related costs from management services contracts, corporate general and administrative expense, unrealized gain on non-real estate investment, gains (losses) from investments in securities, other income - assignment fee, interest and other income (loss), gains on sales of real estate, income (loss) from unconsolidated joint ventures, 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.

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. The Company also presents information for each segment by property type, including Premier Workplace (which includes office, life sciences and retail), Residential and Hotel.

34

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

For the three months ended June 30, 2023:

	Boston			Los Angeles			New York			San Francisco			Seattle			Washington, DC			Total
Rental Revenue: (1)
Premier Workplace	$	269,464		$	—		$	262,979		$	136,241		$	17,060		$	90,720		$	776,464
Residential	4,124			—			—			3,864			—			4,265			12,253
Hotel	13,969			—			—			—			—			—			13,969
Total	287,557			—			262,979			140,105			17,060			94,985			802,686
% of Grand Totals	35.83		%	—		%	32.76		%	17.45		%	2.13		%	11.83		%	100.00		%
Rental Expenses:
Premier Workplace	95,597			—			102,948			48,197			3,082			35,429			285,253
Residential	1,601			—			—			2,215			—			1,967			5,783
Hotel	8,161			—			—			—			—			—			8,161
Total	105,359			—			102,948			50,412			3,082			37,396			299,197
% of Grand Totals	35.21		%	—		%	34.41		%	16.85		%	1.03		%	12.50		%	100.00		%
Net operating income	$	182,198		$	—		$	160,031		$	89,693		$	13,978		$	57,589		$	503,489
% of Grand Totals	36.19		%	—		%	31.78		%	17.81		%	2.78		%	11.44		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(11,343)			—			(36,615)			—			—			—			(47,958)
Add: Company’s share of net operating income from unconsolidated joint ventures	8,771			12,768			3,363			3,332			1,878			12,142			42,254
Company’s share of net operating income	$	179,626		$	12,768		$	126,779		$	93,025		$	15,856		$	69,731		$	497,785
% of Grand Totals	36.08		%	2.56		%	25.47		%	18.69		%	3.19		%	14.01		%	100.00		%

  _______________

(1)Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.

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For the three months ended June 30, 2022:

	Boston			Los Angeles			New York			San Francisco			Seattle			Washington, DC			Total
Rental Revenue: (1)
Premier Workplace	$	244,936		$	—		$	254,264		$	133,707		$	6,472		$	95,954		$	735,333
Residential	3,748			—			—			5,850			—			7,314			16,912
Hotel	12,089			—			—			—			—			—			12,089
Total	260,773			—			254,264			139,557			6,472			103,268			764,334
% of Grand Totals	34.11		%	—		%	33.27		%	18.26		%	0.85		%	13.51		%	100.00		%
Rental Expenses:
Premier Workplace	87,027			—			95,363			45,201			1,680			34,759			264,030
Residential	1,492			—			—			5,145			—			3,181			9,818
Hotel	6,444			—			—			—			—			—			6,444
Total	94,963			—			95,363			50,346			1,680			37,940			280,292
% of Grand Totals	33.88		%	—		%	34.02		%	17.96		%	0.60		%	13.54		%	100.00		%
Net operating income	$	165,810		$	—		$	158,901		$	89,211		$	4,792		$	65,328		$	484,042
% of Grand Totals	34.25		%	—		%	32.83		%	18.43		%	0.99		%	13.50		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(11,377)			—			(36,485)			—			—			—			(47,862)
Add: Company’s share of net operating income (loss) from unconsolidated joint ventures	8,134			13,247			18			3,183			1,944			9,184			35,710
Company’s share of net operating income	$	162,567		$	13,247		$	122,434		$	92,394		$	6,736		$	74,512		$	471,890
% of Grand Totals	34.44		%	2.81		%	25.95		%	19.58		%	1.43		%	15.79		%	100.00		%

  _______________

(1)Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.

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

For the six months ended June 30, 2023:

	Boston			Los Angeles			New York			San Francisco			Seattle			Washington, DC			Total
Rental Revenue: (1)
Premier Workplace	$	539,415		$	—		$	521,171		$	272,334		$	31,318		$	181,384		$	1,545,622
Residential	8,173			—			—			7,506			—			8,300			23,979
Hotel	22,070			—			—			—			—			—			22,070
Total	569,658			—			521,171			279,840			31,318			189,684			1,591,671
% of Grand Totals	35.79		%	—		%	32.74		%	17.58		%	1.97		%	11.92		%	100.00		%
Rental Expenses:
Premier Workplace	195,646			—			205,433			94,282			6,042			69,695			571,098
Residential	3,153			—			—			4,388			—			3,705			11,246
Hotel	14,832			—			—			—			—			—			14,832
Total	213,631			—			205,433			98,670			6,042			73,400			597,176
% of Grand Totals	35.78		%	—		%	34.40		%	16.52		%	1.01		%	12.29		%	100.00		%
Net operating income	$	356,027		$	—		$	315,738		$	181,170		$	25,276		$	116,284		$	994,495
% of Grand Totals	35.80		%	—		%	31.75		%	18.22		%	2.54		%	11.69		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(22,160)			—			(72,895)			—			—			—			(95,055)
Add: Company’s share of net operating income (loss) from unconsolidated joint ventures	17,348			25,993			7,013			6,796			3,724			22,136			83,010
Company’s share of net operating income	$	351,215		$	25,993		$	249,856		$	187,966		$	29,000		$	138,420		$	982,450
% of Grand Totals	35.75		%	2.65		%	25.43		%	19.13		%	2.95		%	14.09		%	100.00		%

  _______________

(1)Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.

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For the six months ended June 30, 2022:

	Boston			Los Angeles			New York			San Francisco			Seattle				Washington, DC			Total
Rental Revenue: (1)
Premier Workplace	$	487,014		$	—		$	511,134		$	266,082		$	6,472			$	191,519		$	1,462,221
Residential	7,344			—			—			8,241			—				14,293			29,878
Hotel	16,646			—			—			—			—				—			16,646
Total	511,004			—			511,134			274,323			6,472				205,812			1,508,745
% of Grand Totals	33.87		%	—		%	33.88		%	18.18		%	0.43		%		13.64		%	100.00		%
Rental Expenses:
Premier Workplace	177,555			—			191,703			88,609			1,680				68,306			527,853
Residential	2,929			—			—			7,013			—				6,308			16,250
Hotel	11,284			—			—			—			—				—			11,284
Total	191,768			—			191,703			95,622			1,680			—	74,614			555,387
% of Grand Totals	34.53		%	—		%	34.52		%	17.22		%	0.30		%		13.43		%	100.00		%
Net operating income	$	319,236		$	—		$	319,431		$	178,701		$	4,792			$	131,198		$	953,358
% of Grand Totals	33.49		%	—		%	33.51		%	18.74		%	0.50		%		13.76		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(23,112)			—			(71,805)			—			—				—			(94,917)
Add: Company’s share of net operating income (loss) from unconsolidated joint ventures	17,827			27,004			(138)			6,364			3,899				18,075			73,031
Company’s share of net operating income	$	313,951		$	27,004		$	247,488		$	185,065		$	8,691			$	149,273		$	931,472
% of Grand Totals	33.70		%	2.90		%	26.57		%	19.87		%	0.93		%		16.03		%	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.

12. Earnings Per Share / Common Unit

BXP

The following table provides a reconciliation of both the net income attributable to Boston Properties, Inc. 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. 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 - 2020 MYLTIP Units required, and the 2021 - 2023 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.

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	Three months ended June 30, 2023
	Income (Numerator)		Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc.	$	104,299	156,826	$	0.67
Effect of Dilutive Securities:
Stock Based Compensation	—		392	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties, Inc.	$	104,299	157,218	$	0.66
	Three months ended June 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.	$	222,989	156,720	$	1.42
Allocation of undistributed earnings to participating securities	(267)		—	—
Net income attributable to Boston Properties, Inc.	222,722		156,720	1.42
Effect of Dilutive Securities:
Stock Based Compensation	—		472	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc.	$	222,722	157,192	$	1.42

	Six months ended June 30, 2023
	Income (Numerator)		Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc.	$	182,215	156,815	$	1.16
Effect of Dilutive Securities:
Stock Based Compensation	—		316	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc.	$	182,215	157,131	$	1.16

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	Six months ended June 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.	$	366,044	156,685	$	2.33
Allocation of undistributed earnings to participating securities	(236)		—	—
Net income attributable to Boston Properties, Inc.	365,808		156,685	2.33
Effect of Dilutive Securities:
Stock Based Compensation	—		413	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc.	$	365,808	157,098	$	2.33

BPLP

The following table provides a reconciliation of both the net income attributable to Boston Properties Limited Partnership 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 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 - 2020 MYLTIP Units required, and the 2021 - 2023 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 17,922,000 and 17,672,000 redeemable common units for the three months ended June 30, 2023 and 2022, respectively, and 17,878,000 and 17,638,000 redeemable common units for the six months ended June 30, 2023 and 2022, respectively.

	Three months ended June 30, 2023
	Income (Numerator)		Units (Denominator)	Per Unit Amount
	(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership	$	118,098	174,748	$	0.68
Effect of Dilutive Securities:
Stock Based Compensation	—		392	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership	$	118,098	175,140	$	0.67

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	Three months ended June 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	$	253,788	174,392	$	1.45
Allocation of undistributed earnings to participating securities	(297)		—	—
Net income attributable to Boston Properties Limited Partnership	253,491		174,392	1.45
Effect of Dilutive Securities:
Stock Based Compensation	—		472	—
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership	$	253,491	174,864	$	1.45

	Six months ended June 30, 2023
	Income (Numerator)		Units (Denominator)	Per Unit Amount
	(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership	$	206,928	174,693	$	1.18
Effect of Dilutive Securities:
Stock Based Compensation	—		316	—
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership	$	206,928	175,009	$	1.18
	Six months ended June 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	$	415,617	174,323	$	2.38
Allocation of undistributed earnings to participating securities	(263)		—	—
Net income attributable to Boston Properties Limited Partnership	415,354		174,323	2.38
Effect of Dilutive Securities:
Stock Based Compensation	—		413	—
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership	$	415,354	174,736	$	2.38

13. Stock Option and Incentive Plan

On January 25, 2023, BXP’s Compensation Committee approved the grant of 2023 MYLTIP awards under the Boston Properties, Inc. 2021 Stock Incentive Plan (the “2021 Plan”) to certain executive officers of BXP, effective February 7, 2023. The 2023 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.

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Total earned awards under the 2023 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 322,053 LTIP Units with a target of approximately 161,026 LTIP Units and linear interpolation between zero and maximum. Earned awards (if any) will vest 100% on February 6, 2026, but, in general, may not be converted, redeemed, sold or otherwise transferred for one additional year thereafter. The 2023 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 2023 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 2023 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 2023 MYLTIP Units during the performance period on all of the awarded 2023 MYLTIP Units. Under ASC 718 “Compensation - Stock Compensation,” the 2023 MYLTIP awards have an aggregate value of approximately $13.1 million, which amount will generally be amortized into earnings under the graded vesting method.

On February 3, 2023, the measurement period for the Company’s 2020 MYLTIP awards ended and, based on BXP’s relative TSR performance, the final payout was determined to be 50% of target, or an aggregate of approximately $3.8 million (after giving effect to employee separations). As a result, an aggregate of 152,460 2020 MYLTIP Units that had been previously granted were automatically forfeited.

During the six months ended June 30, 2023, BXP issued 73,414 shares of restricted common stock and BPLP issued 427,176 LTIP Units and 322,053 2023 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 2023 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 six months ended June 30, 2023 were valued at approximately $5.4 million. The LTIP Units granted were valued at approximately $29.2 million using a Monte Carlo simulation method model. Because the 2012 OPP Units and 2013 - 2023 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 $14.9 million and $14.6 million for the three months ended June 30, 2023 and 2022, respectively, and $40.9 million and $35.5 million for the six months ended June 30, 2023 and 2022, respectively. At June 30, 2023, there was (1) an aggregate of approximately $29.2 million of unrecognized compensation expense related to unvested restricted stock, LTIP Units and 2020 MYLTIP Units and (2) an aggregate of approximately $0.8 million of unrecognized compensation expense related to unvested 2021 - 2023 MYLTIP Units that is expected to be recognized over a weighted-average period of approximately 2.7 years.

14. Subsequent Events

On July 20, 2023, the Company completed and fully placed in-service 140 Kendrick Street - Building A, a premier workplace redevelopment project with approximately 104,000 net rentable square feet located in Needham, Massachusetts.

On July 28, 2023, the Company entered into a joint venture agreement with an institutional investor for the future development of 343 Madison Avenue located on Madison Avenue between 44th and 45th Streets in New York City, New York adjacent to Grand Central Station. The Company owns a 55% interest in the venture and its partner owns a 45% interest, and the Company will provide customary development, property management, and leasing services. The 343 Madison Avenue project contemplates the construction of (1) a direct entrance to the Long Island

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Railroad’s new east side access project (Grand Central Madison) (“Phase 1”) and (2) an approximately 900,000 square foot premier workplace building with ground floor retail (“Phase 2”). Subsequently, on August 1, 2023, the joint venture executed a 99-year ground lease with the Metropolitan Transportation Authority for the approximately 25,000 square foot site. The ground lease requires the joint venture to construct the direct access to Grand Central Madison as Phase 1 of the development project. The joint venture has the option until July 31, 2025 to terminate the ground lease prior to construction of the new building and receive reimbursement for the cost of the construction of access to Grand Central Station. There can be no assurance that Phase 1 will be completed on the terms currently contemplated or that Phase 2 of the development project will commence on the terms currently contemplated or at all.

On July 28, 2023, a joint venture in which the Company has a 50% interest modified and exercised an option to extend by one year the maturity date of its loan collateralized by 100 Causeway Street. At the time of the modification and extension, the loan had an outstanding balance totaling approximately $340.6 million, bore interest at Term SOFR plus 1.60% per annum, and was scheduled to mature on September 5, 2023. The modified and extended loan has an outstanding balance of $336.6 million, which included an approximately $4.0 million principal repayment, bears interest at Term SOFR plus 1.48% per annum, and matures on September 5, 2024, with an additional one-year extension option, subject to certain conditions. 100 Causeway Street is an approximately 634,000 square foot premier workplace located in Boston, Massachusetts and is approximately 95% leased.

Effective July 28, 2023, BXP’s independent directors appointed Joel I. Klein to serve as the lead independent director, replacing Kelly A. Ayotte. Ms. Ayotte stepped down as the lead independent director due to the additional time commitment and responsibilities of that role, and the independent directors determined that it is in the best interests of BXP and its stockholders that Mr. Klein once again assume that role. Ms. Ayotte served as BXP’s lead independent director since May 2022 and will remain on BXP’s Board of Directors. Mr. Klein previously served as BXP’s lead independent director from May 2016 to May 2019 and as its independent Chairman from May 2019 to May 2022.

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ITEM 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations.

The following discussion should be read in conjunction with the financial statements and notes thereto appearing elsewhere in this report.

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 we 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. If one or more of these known or unknown risks or uncertainties materialize, or if 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 risks and uncertainties related to the impact of changes in general economic and capital market conditions, including continued inflation, increasing interest rates, supply chain disruptions, labor market disruptions, dislocation and volatility in capital markets, and potential longer-term changes in consumer and client behavior resulting from the severity and duration of any downturn in the U.S. or global economy, sustained changes in client preferences and space utilization, as well as the other important factors below and the risks described in (i) our Annual Report on Form 10-K for the fiscal year ended December 31, 2022 including those described under the caption “Risk Factors,” (ii) our Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2023, (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:

•volatile or adverse global economic and geopolitical conditions, health crises, dislocations in the credit markets and potential financial contagion from recent or future failures of banking institutions could adversely affect economic conditions and/or restrict our access to cost-effective capital, which could have a material adverse effect on our business opportunities, results of operations and financial condition;

•general risks affecting the real estate industry (including, without limitation, the inability to enter into or renew leases, changes in client preferences and space utilization, dependence on clients’ financial condition, and competition from other developers, owners and operators of real estate);

•the impact of geopolitical conflicts, including the ongoing war in Ukraine;

•the immediate and long-term impact of the outbreak of a highly infectious or contagious disease, such as COVID-19, on our and our clients’ financial condition, results of operations and cash flows (including the impact of actions taken to contain the outbreak or mitigate its impact, the direct and indirect economic effects of the outbreak and containment measures on our clients, and the ability of our clients to successfully operate their businesses);

•failure to manage effectively our growth and expansion into new markets and sub-markets or to integrate acquisitions and developments successfully;

•the ability of our joint venture partners to satisfy their obligations;

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•risks and uncertainties affecting property development and construction (including, without limitation, 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 derivatives 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 climate change and severe weather events, as well as the regulatory efforts intended to reduce the 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. 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 June 30, 2023) in the U.S. that develops, owns, and manages primarily premier workplaces. Our properties are concentrated in six dynamic gateway markets in the U.S. - 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 amount of any security deposit or letter of credit posted by the client, 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

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market overall (including sublease space), current and expected future demand for the space, the impact of other clients’ expansion rights and general economic factors.

Our core strategy has always been to develop, acquire and manage 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. As of June 30, 2023, the weighted-average remaining lease term for our in-place leases based on square feet, including those signed by our unconsolidated joint ventures but excluding residential units, was approximately 7.6 years. The weighted-average remaining lease term for our 20 largest clients, based on leased square footage, was approximately 10.4 years as of June 30, 2023.

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 high-quality developer, owner and manager of premier workplaces in our markets;

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

•our relationships with local brokers.

Outlook

The U.S.’s economic growth is challenging to forecast as there are currently two competing and viable theories predicting very different trajectories. The first theory is that inflation is increasingly under control due to pandemic economic anomalies wearing off and the Federal Reserve’s aggressive interest rate hikes. Notwithstanding tighter fiscal and monetary conditions, the economy has remained healthy with a strong labor market and continued GDP growth driven by consumption. The GDP, adjusted for inflation, rose 2.4% in the second quarter of 2023. Consumer spending fueled the solid quarter, accounting for 68% of all economic activity during the quarter. This first theory envisions a ‘soft landing’ for inflation with no recession.

The second theory is that inflation is already well under control and the Federal Reserve has been overly aggressive in the magnitude and timing of its interest rate increases, which will create dislocation in sectors of the economy, as has already started to occur with regional banks and commercial real estate. This scenario forecasts an upcoming recession, possibly as soon as later this year. While we would prefer the outcome of the first theory, BXP is prepared for the second theory by increasing liquidity, pursuing additional capital raising opportunities, and being measured in discretionary capital expenditures and new investment activity.

Whether or not the U.S. is in an economic recession, companies are experiencing a recession in earnings with S&P 500 companies reporting a 7.3% year-over-year drop in earnings per share in the second quarter of 2023. With lower earnings, companies are still focused on cost reductions, including expenditures on space. Some companies are taking more time to make leasing decisions, leasing less space, offering space they have for sublease or taking a combination of one or more of the foregoing actions. This has contributed to our slower leasing volume in the first half of 2023 compared to last year.

The return-to-office trend continues to improve in the markets in which we operate. Companies in a variety of industries, including major technology companies, are increasing the days that workers on hybrid schedules are required to come into the office and reinforcing the importance of in-person interactions as a key contributor to overall success. Companies are emboldened by the weaker economy to enforce firmer in-person work policies. Several large companies have notified their employees that their attendance in office will be included in performance reviews and that employees who already have received approval for remote work may now have that status reevaluated. We believe the sentiment surrounding return-to-office and the effects on office buildings is worse than the reality of what BXP is experiencing. Throughout our portfolio, there has been a slow but steady increase in the number of unique occupants that are in our offices each month.

A primary tool used by companies to increase attendance is to provide modern workspaces with amenities in an easily commutable location, the definition of a premier workplace. As a result, the premier workplace segment, which we operate in, continues to outperform the broader office market, in both vacancy and net absorption, as

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companies see an opportunity to upgrade their workplaces as a method of attracting their workforces back to the office and recruiting new employees.

The evolving operating environment impacts various aspects of our operating activities as:

•labor market conditions shift, resulting in increasing employer demands for mandatory in-person workdays;

•volatility in the capital markets, on the heels of recent bank failures, have driven companies to be more reticent in capital outlays, including capital required for leasing new space;

•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 and, although most of the cost for our active development pipeline is fixed, the cost of potential future construction activity continues to increase.

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

•continuing to embrace our leadership position in the premier workplace segment 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 compared to general office space and demonstrating the highest occupancy, net absorption levels and rental rates in the central business districts (“CBDs”) in 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 residential development;

•continuing to raise the bar in the quality of our portfolio and actively recycling capital by selling assets, subject to market conditions, which have been, and may continue to be, negatively impacted by a slowdown in the capital markets and the limited availability of private market debt financing;

•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.

The following is an overview of leasing and investment activity in the second quarter of 2023 and recent business highlights.

Leasing Activity and Occupancy

In the second quarter of 2023, we signed a total of approximately 938,000 square feet of leases with a weighted-average lease term of approximately 8.0 years. The leasing volume increased from approximately 660,000 square feet of leases signed in the first quarter of 2023.

The overall occupancy of our in-service premier workplace and retail properties was 88.3% at June 30, 2023. We define occupancy as space with signed leases for which revenue recognition has commenced in accordance with GAAP. Including vacant space for which we have signed leases that have not yet commenced in accordance with GAAP, our in-service premier workplace and retail properties were approximately 90.4% leased at June 30, 2023.

The macroeconomic environment has resulted in softening demand in all of our markets. While property 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. We have factored in the impacts of a slower economy, softer business performance, and reduced demand for space into our leasing expectations for the remainder of 2023. We expect the bulk of our leasing in 2023 will continue to come from small- and medium-sized professional and financial services firms.

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Investment Activity

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. Additional new acquisition opportunities will likely increase in this environment, and we remain committed to developing and acquiring assets to enhance our long-term growth and to meet client demand solely focused on premier workplaces, life sciences, and residential development.

As of June 30, 2023, our development/redevelopment pipeline consisted of 13 properties that, when completed, we expect will total approximately 3.1 million net rentable square feet. Our share of the estimated total cost for these projects is approximately $2.6 billion, of which approximately $1.6 billion remains to be invested. The commercial space in the pipeline, which excludes Reston Next Residential, is 54% pre-leased.

In June 2023, View Boston Observatory, the highly anticipated experiential observation deck encompassing the top three floors of 800 Boylston Street - The Prudential Center in Boston, Massachusetts, opened. The approximately 63,000 square-foot experience provides a unique opportunity to enjoy 360-degree panoramic views of the city, food and beverage at the Stratus cocktail bar and The Beacon bistro, and interactive state-of-the-art immersive exhibits that showcase Boston's many neighborhoods and cultural landmarks.

In the second quarter of 2023, we completed and fully placed in-service 2100 Pennsylvania Avenue in Washington, D.C. 2100 Pennsylvania Avenue is an approximately 476,000 square foot premier workplace and was approximately 61.8% occupied and approximately 90.5% leased (including vacant space for which we have signed leases that have not yet commenced in accordance with GAAP) as of June 30, 2023.

On July 28, 2023, we entered into a joint venture agreement with an institutional investor for the future development of 343 Madison Avenue located on Madison Avenue between 44th and 45th Streets in New York City, New York adjacent to Grand Central Station. We own a 55% interest in the venture and our partner owns a 45% interest, and we will provide customary development, property management, and leasing services. The 343 Madison Avenue project contemplates the construction of (1) a direct entrance to the Long Island Railroad’s new east side access project (Grand Central Madison) (“Phase 1”) and (2) an approximately 900,000 square foot premier workplace building with ground floor retail (“Phase 2”). Subsequently, on August 1, 2023, the joint venture executed a 99-year ground lease with the Metropolitan Transportation Authority for the approximately 25,000 square foot site. The ground lease requires the joint venture to construct the direct access to Grand Central Madison as Phase 1 of the development project. The joint venture has the option until July 31, 2025 to terminate the ground lease prior to construction of the new building and receive reimbursement for the cost of the construction of access to Grand Central Station. There can be no assurance that Phase 1 will be completed on the terms currently contemplated or that Phase 2 of the development project will commence on the terms currently contemplated or at all.

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. However, the asset sale market for all real estate asset classes has slowed dramatically with the increase in interest rates and transaction volume for office assets continues to be minimal in the U.S.

A brief overview of each of our markets follows.

Boston

During the second quarter of 2023, we executed approximately 320,000 square feet of leases and approximately 291,000 square feet of leases commenced in the Boston region. Approximately 221,000 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 20% over the prior leases.

As of June 30, 2023, our Boston CBD in-service portfolio was approximately 95.1% occupied and approximately 96.9% leased (including vacant space for which we have signed leases that have not yet commenced in accordance with GAAP).

Our approximately 2.5 million square foot in-service premier workplace portfolio in Cambridge was approximately 97.2% occupied and leased (including vacant space for which we have signed leases that have not yet commenced in accordance with GAAP) as of June 30, 2023.

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As of June 30, 2023, our Route 128-Mass Turnpike portfolio is comprised of approximately 4.8 million square feet and was approximately 79.6% occupied and approximately 80.9% leased (including vacant space for which we have signed leases that have not yet commenced in accordance with GAAP).

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 June 30, 2023, our LA in-service properties were approximately 86.0% occupied and 86.2% leased (including vacant space for which we have signed leases that have not yet commenced in accordance with GAAP).

New York

During the second quarter of 2023, we executed approximately 280,000 square feet of leases in the New York region and approximately 323,000 square feet of leases commenced. Approximately 63,000 square feet of the leases that commenced had been vacant for less than one year and they represent an increase in net rental obligations of approximately 64% over the prior leases. As of June 30, 2023, our New York CBD in-service portfolio was approximately 90.3% occupied and approximately 92.7% leased (including vacant space for which we have signed leases that have not yet commenced in accordance with GAAP).

San Francisco

During the second quarter of 2023, we executed approximately 101,000 square feet of leases and approximately 76,000 square feet of leases commenced in the San Francisco region. Approximately 50,000 square feet of leases that commenced had been vacant for less than one year and represent an increase in net rental obligations of approximately 13% over the prior leases.

As of June 30, 2023, our San Francisco CBD in-service properties were approximately 89.1% occupied and approximately 90.3% leased (including vacant space for which we have signed leases that have not yet commenced in accordance with GAAP).

Client demand in the San Francisco CBD had increased more than 50% since the fourth quarter of 2022 with new technology demand responsible for much of the increase. There are a significant number of artificial intelligence (“AI”) companies actively considering space and the requirements will create net absorption. Given the potential growth of these organizations, we would expect this demand to center on the well-built technology sublet space that is readily available in the San Francisco market. Global investment in the AI industry is rapidly increasing and is likely to result in job growth. San Francisco is the leading labor market for AI jobs followed by New York and Seattle. New venture capital investment in AI is concentrated in San Francisco, New York and Boston with CBRE Insights Research reporting that San Francisco will be receiving more than 50% of the total invested during the third quarter. These are encouraging facts that could be constructive to the recovery of the San Francisco office market, if they come to fruition.

Seattle

Our Seattle in-service portfolio includes Safeco Plaza, an approximately 779,000 square foot property of which we own 33.67%, and Madison Centre, an approximately 755,000 square foot property. As of June 30, 2023, our Seattle in-service properties were approximately 87.9% occupied and approximately 90.5% leased (inclusive of vacant space with signed leases that have not yet commenced in accordance with GAAP).

Washington, DC

During the second quarter of 2023, we executed approximately 236,000 square feet of leases and approximately 351,000 square feet of leases commenced in the Washington, DC region. Approximately 220,000 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 8% over the prior leases. As of June 30, 2023, our Washington, DC CBD in-service properties were approximately 78.5% occupied and approximately 83.0% leased (inclusive of vacant space with signed leases that have not yet commenced in accordance with GAAP).

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. As of June 30, 2023, our Reston, Virginia properties were approximately 88.2%

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occupied and approximately 93.4% leased (inclusive of vacant space with signed leases that have not yet commenced in accordance with GAAP).

Leasing Statistics

The table below details the leasing activity, including 100% of the unconsolidated joint ventures, that commenced during the three and six months ended June 30, 2023:

	Three months ended June 30, 2023		Six months ended June 30, 2023
	(Square Feet)
Vacant space available at the beginning of the period	5,569,935		5,610,777
Property dispositions/properties taken out of service (1)	—		(333,277)
Properties placed (and partially placed) in-service (2)	181,597		181,597
Leases expiring or terminated during the period	1,093,663		2,161,543
Total space available for lease	6,845,195		7,620,640
1st generation leases	151,087		151,087
2nd generation leases with new clients	556,310		988,313
2nd generation lease renewals	335,037		678,479
Total space leased (3)	1,042,434		1,817,879
Vacant space available for lease at the end of the period	5,802,761		5,802,761
Leases executed during the period, in square feet (4)	937,536		1,598,016
Second generation leasing information: (5)
Leases commencing during the period, in square feet	891,347		1,666,792
Weighted Average Lease Term	88 Months		89 Months
Weighted Average Free Rent Period	186 Days		181 Days
Total Transaction Costs Per Square Foot (6)	$60.70		$66.33
Increase in Gross Rents (7)	6.31	%	3.30	%
Increase in Net Rents (8)	10.02	%	5.28	%

 __________________

(1)Total vacant square feet of properties taken out of service during the six months ended June 30, 2023 consists of 195,191 square feet at 300 Binney Street, 55,852 square feet at 420 Bedford Street, 57,045 square feet at 430 Bedford Street and 25,189 square feet at 2098 Gaither Road.

(2)Total vacant square feet of properties placed in service during the three and six months ended June 30, 2023 consists of 181,597 square feet at 2100 Pennsylvania Avenue.

(3)Represents leases for which lease revenue recognition has commenced in accordance with GAAP during the three and six months ended June 30, 2023.

(4)Represents leases executed during the three and six months ended June 30, 2023 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 six months ended June 30, 2023 are 116,230 and 303,128 square feet, respectively.

(5)Second generation leases are defined as leases for space that has previously been leased by us. Of the 891,347 and 1,666,792 square feet of second generation leases that commenced during the three and six months ended June 30, 2023, respectively, leases for 776,928 and 1,365,475 square feet, respectively, were signed in prior periods.

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

(7)Represents the increase in gross rent (base rent plus expense reimbursements) on the new versus expired leases on the 554,458 and 1,059,940 square feet of second generation leases that had been occupied within the prior 12 months for the three and six months ended June 30, 2023, respectively; excludes leases that

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management considers temporary because the client is not expected to occupy the space on a long-term basis.

(8)Represents the increase in net rent (gross rent less operating expenses) on the new versus expired leases on the 554,458 and 1,059,940 square feet of second generation leases that had been occupied within the prior 12 months for the three and six months ended June 30, 2023, respectively.

Transactions during the three months ended June 30, 2023 included the following:

Development/Redevelopment activities

•On April 29, 2023, we completed and fully placed in-service 2100 Pennsylvania Avenue, a premier workplace project with approximately 476,000 net rentable square feet located in Washington, DC. Including leases with future commencement dates, the property is 91% leased as of July 28, 2023.

•On June 1, 2023, we completed and fully placed in-service our View Boston Observatory at The Prudential Center, a redevelopment of the top three floors of 800 Boylston Street - The Prudential Center, located in Boston, Massachusetts. View Boston Observatory at The Prudential Center consists of approximately 63,000 net rentable square feet of retail, including food and beverage, and observation space.

Unconsolidated joint venture activities

•On April 21, 2023, a joint venture in which we own a 50% interest exercised an option to extend the maturity date of the construction loan collateralized by its 7750 Wisconsin Avenue property. Prior to the extension, the loan had a total commitment amount of approximately $252.6 million, bore interest at a variable rate equal to London interbank offered rate (“LIBOR”) plus 1.25% per annum and was scheduled to mature on April 26, 2023, with two, one-year extension options, subject to certain conditions. The extended loan continued to bear interest at LIBOR plus 1.25% per annum through June 1, 2023 after which, the interest rate was converted to a variable rate equal to Term Secured Overnight Finance Rate (“SOFR”) plus 1.35% per annum. The extended loan now matures on April 26, 2024, with a one-year extension option, subject to certain conditions. 7750 Wisconsin Avenue is a premier workplace with approximately 734,000 net rentable square feet located in Bethesda, Maryland.

•On June 5, 2023, a joint venture in which we own a 30% interest repaid the existing construction loan collateralized by its 500 North Capitol Street, NW property and obtained new mortgage loans with related parties. At the time of the pay off, the outstanding balance of the loan totaled approximately $105.0 million and the loan was scheduled to mature on June 6, 2023. The new mortgage loans have an aggregate principal balance of $105.0 million, bear interest at a weighted average fixed rate of 6.83% per annum and mature on June 5, 2026. Our portion of the mortgage loans, $10.5 million, has been reflected as a Related Party Note Receivable on our Consolidated Balance Sheets. 500 North Capitol Street, NW is an approximately 231,000 net rentable square foot premier workplace in Washington, DC.

•On June 28, 2023, a joint venture in which we own a 25% interest exercised an option to extend by 30 days the maturity date of the loan collateralized by its 3 Hudson Boulevard property. At the time of the modification, the outstanding balance of the loan totaled $80.0 million, bore interest at a variable rate equal to LIBOR plus 3.50% per annum and was scheduled to mature on July 13, 2023, with two extension options (30 days and 180 days, respectively), subject to certain conditions. The modified loan continued to bear interest at a variable rate equal to LIBOR plus 3.50% per annum for the period from June 28, 2023 through July 6, 2023. As of June 30, 2023, the loan had approximately $23.2 million of accrued interest due at the maturity date, August 13, 2023. For the period commencing on July 7, 2023 through the maturity date, the modified loan will bear interest at a variable rate equal to Term SOFR plus approximately 3.61% per annum. The modified loan now matures on August 13, 2023, with one 180 days extension option, subject to certain conditions. 3 Hudson Boulevard consists of land and improvements held for future development located in New York, New York.

•During the three months ended June 30, 2023, a joint venture in which we have a 55% interest elected to pause vertical construction on Platform 16 in San Jose, California. Platform 16 was planned to be constructed in phases to best accommodate market demand. The first phase of the development project included the construction of an approximately 390,000 net rentable square foot premier

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workplace building and below-grade parking garage. The joint venture intends to complete the construction of the below-grade parking garage and building foundation elements over the next several months to facilitate a restart of construction in the future as demand improves.

Debt activities

•On May 15, 2023, BPLP completed a public offering of $750.0 million in aggregate principal amount of its 6.500% unsecured senior notes due 2034. The notes were priced at 99.697% of the principal amount to yield an effective rate (including financing fees) of approximately 6.619% per annum to maturity. The notes will mature on January 15, 2034, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $741.3 million after deducting underwriting discounts and transaction expenses.

•On June 1, 2023, BPLP amended its unsecured credit facility (as amended, the “2021 Credit Facility”) to replace the LIBOR-based daily floating rate option with a SOFR-based daily floating rate option and to add options for SOFR-based term floating rates and rates for alternative currency loans. In addition, the amendment added a SOFR credit spread adjustment of 0.10%. Other than the foregoing, the material terms of the 2021 Credit Facility remain unchanged (See Note 6 to the Consolidated Financial Statements).

Derivative instrument and hedging activity

•On May 2, 2023, BPLP entered into four interest rate swap contracts with notional amounts aggregating $1.2 billion. BPLP entered into these interest rate swap contracts to reduce its exposure to the variability in future cash flows attributable to changes in the interest rate of BPLP’s $1.2 billion unsecured term loan facility (the “2023 Unsecured Term Loan”). These interest rate swaps were entered into to fix Term SOFR, the reference rate for BPLP’s 2023 Unsecured Term Loan, at a weighted-average rate of 4.6420% for the period commencing on May 4, 2023 and ending on May 16, 2024 (see Notes 6 and 7 to the Consolidated Financial Statements).

Equity activity

•On May 17, 2023, 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 May 22, 2023. 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.

Transactions completed subsequent to June 30, 2023 included the following:

•On July 20, 2023, we completed and fully placed in-service 140 Kendrick Street - Building A, a premier workplace redevelopment project with approximately 104,000 net rentable square feet located in Needham, Massachusetts. The property is 100% leased and is the first Net Zero, Carbon Neutral office repositioning of this scale in Massachusetts.

•On July 28, 2023, we entered into a joint venture agreement with an institutional investor for the future development of 343 Madison Avenue located on Madison Avenue between 44th and 45th Streets in New York City, New York adjacent to Grand Central Station. We own a 55% interest in the venture and our partner owns a 45% interest, and we will provide customary development, property management, and leasing services. The 343 Madison Avenue project contemplates the construction of (1) a direct entrance to the Long Island Railroad’s new east side access project (Grand Central Madison) (“Phase 1”) and (2) an approximately 900,000 square foot premier workplace building with ground floor retail (“Phase 2”). Subsequently, on August 1, 2023, the joint venture executed a 99-year ground lease with the Metropolitan Transportation Authority for the approximately 25,000 square foot site. The ground lease requires the joint venture to construct the direct access to Grand Central Madison as Phase 1 of the development project. The joint venture has the option until July 31, 2025 to terminate the ground lease prior to construction of the new building and receive reimbursement for the cost of the construction of access to Grand Central Station. There can be no assurance that Phase 1 will be

52

completed on the terms currently contemplated or that Phase 2 of the development project will commence on the terms currently contemplated or at all.

•On July 28, 2023, a joint venture in which we have a 50% interest modified and exercised an option to extend by one year the maturity date of its loan collateralized by 100 Causeway Street. At the time of the modification and extension, the loan had an outstanding balance totaling approximately $340.6 million, bore interest at Term SOFR plus 1.60% per annum, and was scheduled to mature on September 5, 2023. The modified and extended loan has an outstanding balance of $336.6 million, which included an approximately $4.0 million principal repayment, bears interest at Term SOFR plus 1.48% per annum, and matures on September 5, 2024, with an additional one-year extension option, subject to certain conditions. 100 Causeway Street is an approximately 634,000 square foot premier workplace located in Boston, Massachusetts and is approximately 95% leased.

•Effective July 28, 2023, BXP’s independent directors appointed Joel I. Klein to serve as the lead independent director, replacing Kelly A. Ayotte. Ms. Ayotte stepped down as the lead independent director due to the additional time commitment and responsibilities of that role, and the independent directors determined that it is in the best interests of BXP and its stockholders that Mr. Klein once again assume that role. Ms. Ayotte served as BXP’s lead independent director since May 2022 and will remain on BXP’s Board of Directors. Mr. Klein previously served as BXP’s lead independent director from May 2016 to May 2019 and as its independent Chairman from May 2019 to May 2022.

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, 2022 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, 2022.

Results of Operations for the Six Months Ended June 30, 2023 and 2022

Net income attributable to Boston Properties, Inc. and net income attributable to Boston Properties Limited Partnership decreased by approximately $183.8 million and $208.7 million, respectively, for the six months ended June 30, 2023 compared to 2022, as set forth in the following tables and for the reasons discussed below under the heading “Comparison of the six months ended June 30, 2023 to the six months ended June 30, 2022” 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 six months ended June 30, 2023 and 2022. For a detailed discussion of Net Operating Income (“NOI”), including the reasons management believes NOI is useful to investors, see page 56.

53

BXP

	Six months ended June 30,
	2023		2022		Increase/ (Decrease)		% Change
	(in thousands)
Net Income Attributable to Boston Properties, Inc.	$	182,215	$	366,044	$	(183,829)	(50.22)	%
Net Income Attributable to Noncontrolling Interests:
Noncontrolling interest—common units of the Operating Partnership	21,169		42,061		(20,892)		(49.67)	%
Noncontrolling interests in property partnerships	38,428		36,095		2,333		6.46	%
Net Income	241,812		444,200		(202,388)		(45.56)	%
Other Expenses:
Add:
Interest expense	276,680		205,370		71,310		34.72	%
Other Income:
Less:
Unrealized gain on non-real estate investment	383		—		383		100.00	%
Gains (losses) from investments in securities	3,236		(6,978)		10,214		146.37	%
Other income - assignment fee	—		6,624		(6,624)		(100.00)	%
Interest and other income (loss)	28,284		2,423		25,861		1,067.31	%
Gains on sales of real estate	—		118,948		(118,948)		(100.00)	%
Income (loss) from unconsolidated joint ventures	(14,237)		2,135		(16,372)		(766.84)	%
Other Expenses:
Add:
Depreciation and amortization expense	411,311		360,770		50,541		14.01	%
Transaction costs	1,219		496		723		145.77	%
Payroll and related costs from management services contracts	9,844		7,304		2,540		34.78	%
General and administrative expense	99,977		77,859		22,118		28.41	%
Other Revenue:
Less:
Direct reimbursements of payroll and related costs from management services contracts	9,844		7,304		2,540		34.78	%
Development and management services revenue	18,838		12,185		6,653		54.60	%
Net Operating Income	$	994,495	$	953,358	$	41,137	4.31	%

54

BPLP

	Six months ended June 30,
	2023		2022		Increase/ (Decrease)		% Change
	(in thousands)
Net Income Attributable to Boston Properties Limited Partnership	$	206,928	$	415,617	$	(208,689)	(50.21)	%
Net Income Attributable to Noncontrolling Interests:
Noncontrolling interests in property partnerships	38,428		36,095		2,333		6.46	%
Net Income	245,356		451,712		(206,356)		(45.68)	%
Other Expenses:
Add:
Interest expense	276,680		205,370		71,310		34.72	%
Other Income:
Less:
Unrealized gain on non-real estate investment	383		—		383		100.00	%
Gains (losses) from investments in securities	3,236		(6,978)		10,214		146.37	%
Other income - assignment fee	—		6,624		(6,624)		(100.00)	%
Interest and other income (loss)	28,284		2,423		25,861		1,067.31	%
Gains on sales of real estate	—		122,992		(122,992)		(100.00)	%
Income (loss) from unconsolidated joint ventures	(14,237)		2,135		(16,372)		(766.84)	%
Other Expenses:
Add:
Depreciation and amortization expense	407,767		357,302		50,465		14.12	%
Transaction costs	1,219		496		723		145.77	%
Payroll and related costs from management services contracts	9,844		7,304		2,540		34.78	%
General and administrative expense	99,977		77,859		22,118		28.41	%
Other Revenue:
Less:
Direct reimbursements of payroll and related costs from management services contracts	9,844		7,304		2,540		34.78	%
Development and management services revenue	18,838		12,185		6,653		54.60	%
Net Operating Income	$	994,495	$	953,358	$	41,137	4.31	%

At June 30, 2023 and 2022, we owned or had joint venture interests in a portfolio of 191 and 193 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 six months ended June 30, 2023 and 2022 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, In or Held for Development or Redevelopment or Sold Portfolios.

In our analysis of operating results, particularly to make comparisons of NOI 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 in or held for development or redevelopment after the beginning of the earliest period presented or disposed of prior to the end of the latest period presented.

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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, depreciation and amortization expense, transaction costs, payroll and related costs from management services contracts and corporate general and administrative expense less (2) unrealized gain on non-real estate investment, gains (losses) from investments in securities, other income - assignment fee, interest and other income (loss), gains on sales of real estate, income (loss) from unconsolidated joint ventures, 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 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.

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 redemptions of common units of limited partnership interest of BPLP (“OP Units”). 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 immediately follows the cover page of this Quarterly Report on Form 10-Q.

Comparison of the six months ended June 30, 2023 to the six months ended June 30, 2022

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 38.3 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, 2022 and owned and in service through June 30, 2023. The Total Property Portfolio includes the effects of the other properties either acquired, placed in-service, in or held for development or redevelopment after January 1, 2022 or disposed of on or prior to June 30, 2023. This table includes a reconciliation from the Same Property Portfolio to the Total Property Portfolio by also providing information for the six months ended June 30, 2023 and 2022 with respect to the properties that were acquired, placed in-service, in or held for development or redevelopment or sold.

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	Same Property Portfolio								Properties Acquired Portfolio				Properties Placed In-Service Portfolio				Properties in or Held for Development or Redevelopment Portfolio				Properties Sold Portfolio				Total Property Portfolio
	2023		2022		Increase/ (Decrease)		% Change		2023		2022		2023		2022		2023		2022		2023		2022		2023		2022		Increase/ (Decrease)		% Change
	(dollars in thousands)
Rental Revenue: (1)
Lease Revenue (Excluding Termination Income)	$	1,377,163	$	1,351,293	$	25,870	1.91	%	$	49,859	$	5,815	$	67,334	$	15,200	$	874	$	11,088	$	697	$	26,503	$	1,495,927	$	1,409,899	$	86,028	6.10	%
Termination Income	32		3,867		(3,835)		(99.17)	%	—		133		—		—		—		—		—		—		32		4,000		(3,968)		(99.20)	%
Lease Revenue	1,377,195		1,355,160		22,035		1.63	%	49,859		5,948		67,334		15,200		874		11,088		697		26,503		1,495,959		1,413,899		82,060		5.80	%
Parking and Other	46,948		42,263		4,685		11.09	%	2,114		524		603		—		(3)		4,928		1		607		49,663		48,322		1,341		2.78	%
Total Rental Revenue (1)	1,424,143		1,397,423		26,720		1.91	%	51,973		6,472		67,937		15,200		871		16,016		698		27,110		1,545,622		1,462,221		83,401		5.70	%
Real Estate Operating Expenses	540,020		508,208		31,812		6.26	%	8,053		1,680		18,379		5,058		4,478		4,639		168		8,268		571,098		527,853		43,245		8.19	%
Net Operating Income (Loss), Excluding Residential and Hotel	884,123		889,215		(5,092)		(0.57)	%	43,920		4,792		49,558		10,142		(3,607)		11,377		530		18,842		974,524		934,368		40,156		4.30	%
Residential Net Operating Income (2)	12,733		10,057		2,676		26.61	%	—		—		—		—		—		—		—		3,571		12,733		13,628		(895)		(6.57)	%
Hotel Net Operating Income (2)	7,238		5,362		1,876		34.99	%	—		—		—		—		—		—		—		—		7,238		5,362		1,876		34.99	%
Net Operating Income (Loss)	$	904,094	$	904,634	$	(540)	(0.06)	%	$	43,920	$	4,792	$	49,558	$	10,142	$	(3,607)	$	11,377	$	530	$	22,413	$	994,495	$	953,358	$	41,137	4.31	%

_______________

(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 six months ended June 30, 2023 and 2022 is comprised of Residential Revenue of $23,979 and $29,878 less Residential Expenses of $11,246 and $16,250, respectively. Hotel Net Operating Income for the six months ended June 30, 2023 and 2022 is comprised of Hotel Revenue of $22,070 and $16,646 less Hotel Expenses of $14,832 and $11,284, respectively, per the Consolidated Statements of Operations.

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Same Property Portfolio

Lease Revenue (Excluding Termination Income)

Lease revenue (excluding termination income) from the Same Property Portfolio increased by approximately $25.9 million for the six months ended June 30, 2023 compared to 2022. The increase was a result of our average revenue per square foot increasing by approximately $2.42, contributing approximately $44.0 million, partially offset by average occupancy decreasing from 91.6% to 90.4%, resulting in a decrease of approximately $18.1 million.

Termination Income

Termination income decreased by approximately $3.8 million for the six months ended June 30, 2023 compared to 2022.

Termination income for the six months ended June 30, 2023 related to approximately 15 clients across the Same Property Portfolio and totaled approximately $32,000.

Termination income for the six months ended June 30, 2022 related to 15 clients across the Same Property Portfolio and totaled approximately $3.3 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.

Parking and Other Revenue

Parking and other revenue increased by approximately $4.7 million for the six months ended June 30, 2023 compared to 2022. Parking revenue increased by approximately $5.0 million and was partially offset by a decrease in other revenue of approximately $0.3 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 $31.8 million, or 6.3%, for the six months ended June 30, 2023 compared to 2022, due primarily to increases in real estate taxes of approximately $12.1 million, or 4.9%, and other real estate operating expenses of approximately $17.4 million, or 6.7%. The increase in real estate taxes was primarily in New York City. In addition, there was approximately $2.3 million related to the marketing and initial opening expenses associated with the View Boston Observatory which was completed and placed in-service on June 1, 2023.

Properties Acquired Portfolio

The table below lists the properties acquired between January 1, 2022 and June 30, 2023. Rental revenue and real estate operating expenses increased by approximately $45.5 million and $6.4 million, respectively, for the six months ended June 30, 2023 compared to 2022, as detailed below.

		Square Feet	Rental Revenue						Real Estate Operating Expenses
Name	Date acquired		2023		2022		Change		2023		2022		Change
			(dollars in thousands)
Madison Centre (1)	May 17, 2022	754,988	$	31,314	$	6,472	$	24,842	$	6,043	$	1,680	$	4,363
125 Broadway	September 16, 2022	271,000	20,659		—		20,659		2,010		—		2,010
		1,025,988	$	51,973	$	6,472	$	45,501	$	8,053	$	1,680	$	6,373

______________

(1)Rental revenue for the six months ended June 30, 2022 includes approximately $0.1 million of termination income.

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Properties Placed In-Service Portfolio

The table below lists the properties that were placed in-service or partially placed in-service between January 1, 2022 and June 30, 2023. Rental revenue and real estate operating expenses from our Properties Placed In-Service Portfolio increased by approximately $52.7 million and $13.3 million, respectively, for the six months ended June 30, 2023 compared to 2022, as detailed below.

	Quarter Initially Placed In-Service	Quarter Fully Placed In-Service		Rental Revenue						Real Estate Operating Expenses
Name			Square Feet	2023		2022		Change		2023		2022		Change
				(dollars in thousands)
Reston Next	Fourth Quarter, 2021	Fourth Quarter, 2022	1,063,236	$	22,747	$	14,978	$	7,769	$	7,756	$	5,031	$	2,725
325 Main Street	Second Quarter, 2022	Second Quarter, 2022	414,565	22,879		213		22,666		3,795		10		3,785
2100 Pennsylvania Avenue	Second Quarter, 2022	Second Quarter, 2023	475,849	10,581		9		10,572		4,160		17		4,143
880 Winter Street (1)	Third Quarter, 2022	Fourth Quarter, 2022	243,618	11,730		—		11,730		2,668		—		2,668
			2,197,268	$	67,937	$	15,200	$	52,737	$	18,379	$	5,058	$	13,321

_____________

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

Properties in or Held for Development or Redevelopment Portfolio

The table below lists the properties that were in or held for development or redevelopment between January 1, 2022 and June 30, 2023. Rental revenue and real estate operating expenses from our Properties in or Held for Development or Redevelopment Portfolio decreased by approximately $15.1 million and $0.2 million, respectively, for the six months ended June 30, 2023 compared to 2022, as detailed below.

			Rental Revenue						Real Estate Operating Expenses
Name	Date Commenced or Held for Development / Redevelopment	Square Feet	2023		2022		Change		2023		2022		Change
			(dollars in thousands)
140 Kendrick Street - Building A (1)	July 1, 2022	104,000	$	—	$	2,865	$	(2,865)	$	—	$	683	$	(683)
760 Boylston Street	September 12, 2022	118,000	—		—		—		—		428		(428)
105 Carnegie Center	November 30, 2022	73,000	—		633		(633)		—		462		(462)
2096 Gaither Road	December 1, 2022	50,000	—		111		(111)		58		168		(110)
RTC Next-Hotel (2)	December 19, 2022	N/A	455		—		455		2		—		2
Kendall Center Blue Parking Garage (3)	January 4, 2023	N/A	25		4,925		(4,900)		3,015		656		2,359
300 Binney Street	January 30, 2023	236,000	(900)		5,865		(6,765)		117		934		(817)
Lexington Office Park (4)	March 31, 2023	166,779	975		1,310		(335)		1,108		1,157		(49)
2098 Gaither Road (4)	March 31, 2023	50,000	316		307		9		178		151		27
		797,779	$	871	$	16,016	$	(15,145)	$	4,478	$	4,639	$	(161)

_____________

(1)On July 20, 2023, we completed and fully placed this property in-service.

(2)On December 19, 2022, in accordance with GAAP, the ground lease that encumbers this property was reclassified as a sales-type lease and the associated assets were derecognized.

(3)The Kendall Center Blue Parking Garage was taken out of service on January 4, 2023 to support the development of 290 Binney Street. Real estate operating expenses for the six months ended June 30, 2023 included approximately $3.0 million of demolition costs.

(4)Lexington Office Park and 2098 Gaither Road are no longer considered “in-service” as each property’s occupied percentage is below 50% and we are no longer actively leasing the properties in anticipation of a future development/redevelopment.

59

Properties Sold Portfolio

The table below lists the properties we sold between January 1, 2022 and June 30, 2023. Rental revenue and real estate operating expenses from our Properties Sold Portfolio decreased by approximately $32.4 million and $10.6 million, respectively, for the six months ended June 30, 2023 compared to 2022, as detailed below.

				Rental Revenue						Real Estate Operating Expenses
Name	Date Sold	Property Type	Square Feet	2023		2022		Change		2023		2022		Change
				(dollars in thousands)
Office
195 West Street	March 31, 2022	Office	63,500	$	—	$	749	$	(749)	$	—	$	242	$	(242)
Virginia 95 Office Park	June 15, 2022	Office/Flex	733,421	—		5,190		(5,190)		—		1,787		(1,787)
601 Massachusetts Avenue	August 30, 2022	Office	478,667	—		21,171		(21,171)		—		6,239		(6,239)
Total Office			1,275,588	—		27,110		(27,110)		—		8,268		(8,268)
Residential
The Avant at Reston Town Center (1)	November 8, 2022	Residential	329,195	698		6,027		(5,329)		168		2,456		(2,288)
Total Residential			329,195	698		6,027		(5,329)		168		2,456		(2,288)
			1,604,783	$	698	$	33,137	$	(32,439)	$	168	$	10,724	$	(10,556)

_____________

(1)We retained and continue to own approximately 26,000 square feet of ground-level retail space. Rental Revenue and Real Estate Operating Expenses for the six months ended June 30, 2023 represent the ground-level retail space. Rental Revenue and Real Estate Operating Expenses for the six months ended June 30, 2022 represent the entire property and not just the portion sold.

For additional information on the sales of the above properties refer to “Results of Operations—Other Income and Expense Items—Gains on Sales of Real Estate” within “Item 2—Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

Residential Net Operating Income

Net operating income for our residential same properties increased by approximately $2.7 million for the six months ended June 30, 2023 compared to 2022.

The following reflects our occupancy and rate information for our residential same properties for the six months ended June 30, 2023 and 2022.

	Average Monthly Rental Rate (1)						Average Rental Rate Per Occupied Square Foot						Average Physical Occupancy (2)						Average Economic Occupancy (3)
Name	2023		2022		Change (%)		2023		2022		Change (%)		2023		2022		Change (%)		2023		2022		Change (%)
Proto Kendall Square	$	3,034	$	2,759	10.0	%	$	5.57	$	5.07	9.9	%	95.6	%	94.4	%	1.3	%	95.3	%	93.7	%	1.7	%
The Lofts at Atlantic Wharf	$	4,434	$	4,015	10.4	%	$	4.91	$	4.47	9.8	%	95.9	%	96.9	%	(1.0)	%	96.4	%	96.4	%	—	%
Signature at Reston	$	2,670	$	2,631	1.5	%	$	2.77	$	2.71	2.2	%	94.2	%	94.7	%	(0.5)	%	93.4	%	94.1	%	(0.7)	%
The Skylyne	$	3,446	$	3,366	2.4	%	$	4.39	$	4.09	7.3	%	91.9	%	77.7	%	18.3	%	89.6	%	75.2	%	19.1	%

_____________  

(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

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fact that units of different sizes and locations within a residential property have different economic impacts on a residential property’s total possible gross revenue. Market Rents used by us in calculating Economic Occupancy are based on the current market rates set by the managers of our residential properties based on their experience in renting their residential property’s units and publicly available market data. Actual market rents and trends in such rents for a region as reported by others may vary materially from Market Rents used by us. Market Rents for a period are based on the average Market Rents during that period and do not reflect any impact for cash concessions.

Hotel Net Operating Income

The Boston Marriott Cambridge hotel had net operating income of approximately $7.2 million for the six months ended June 30, 2023, representing an increase of approximately $1.9 million compared to the six months ended June 30, 2022. As demand for travel has returned, the Boston Marriott Cambridge has seen an increase in occupancy and room rates, which has led to increased net operating income.

The following reflects our occupancy and rate information for the Boston Marriott Cambridge hotel for the six months ended June 30, 2023 and 2022.

	2023			2022			Change (%)
Occupancy	69.3		%	57.1		%	21.4	%
Average daily rate	$	323.14		$	306.36		5.5	%
REVPAR	$	223.95		$	208.11		7.6	%

Other Operating Revenue and Expense Items

Development and Management Services Revenue

Development and management services revenue increased by approximately $6.7 million for the six months ended June 30, 2023 compared to 2022. Development services revenue and management services revenue increased by approximately $2.2 million and $4.5 million, respectively. The increase in development services revenue was primarily related to an increase in development fees earned from unconsolidated joint venture properties in the San Francisco and Washington, DC regions. The increase in management services revenue was primarily related to an increase in property management fees from an unconsolidated joint venture in the New York region and asset management fees earned from an unconsolidated joint venture in the Los Angeles region.

General and Administrative Expense

General and administrative expense increased by approximately $22.1 million for the six months ended June 30, 2023 compared to 2022 primarily due to increases in compensation expense and other general and administrative expenses of approximately $20.3 million and $1.8 million, respectively. The increase in compensation expense related to (1) an approximately $10.2 million increase in the value of our deferred compensation plan and (2) an approximately $10.1 million increase in other compensation expenses, primarily due to age-based vesting and annual increases in employee compensation. The increase in other general and administrative expenses 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 six months ended June 30, 2023 and 2022 were approximately $9.1 million and $8.1 million, respectively. These costs are not included in the general and administrative expenses discussed above.

Transaction Costs

Transaction costs increased by approximately $0.7 million for the six months ended June 30, 2023 compared to 2022 due primarily to costs incurred in connection with the pursuit and formation of new joint ventures in 2023 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

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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 immediately follows the cover page of this Quarterly Report on Form 10-Q.

BXP

Depreciation and amortization expense increased by approximately $50.5 million for the six months ended June 30, 2023 compared to 2022, as detailed below.

Portfolio	Depreciation and Amortization for the six months ended June 30,
	2023		2022		Change
	(in thousands)
Same Property Portfolio	$	339,732	$	339,692	$	40
Properties Acquired Portfolio	35,080		4,174		30,906
Properties Placed In-Service Portfolio	23,188		6,709		16,479
Properties in or Held for Development or Redevelopment Portfolio (1)	13,088		4,005		9,083
Properties Sold Portfolio	223		6,190		(5,967)
	$	411,311	$	360,770	$	50,541

_____________

(1)During the six months ended June 30, 2023, the Kendall Center Blue Parking Garage was taken out of service and demolished to support the development of 290 Binney Street, an approximately 566,000 net rentable square foot laboratory/life sciences project in Cambridge, Massachusetts. As a result, during the six months ended June 30, 2023, we recorded approximately $0.8 million of accelerated depreciation expense for the demolition of the garage, of which approximately $0.2 million related to the step-up of real estate assets.

BPLP

Depreciation and amortization expense increased by approximately $50.5 million for the six months ended June 30, 2023 compared to 2022, as detailed below.

Portfolio	Depreciation and Amortization for the six months ended June 30,
	2023		2022		Change
	(in thousands)
Same Property Portfolio	$	336,368	$	336,224	$	144
Properties Acquired Portfolio	35,080		4,174		30,906
Properties Placed In-Service Portfolio	23,188		6,709		16,479
Properties in or Held for Development or Redevelopment Portfolio (1)	12,908		4,005		8,903
Properties Sold Portfolio	223		6,190		(5,967)
	$	407,767	$	357,302	$	50,465

_____________

(1)During the six months ended June 30, 2023, the Kendall Center Blue Parking Garage was taken out of service and demolished to support the development of 290 Binney Street, an approximately 566,000 net rentable square foot laboratory/life sciences project in Cambridge, Massachusetts. As a result, during the six months ended June 30, 2023, we recorded approximately $0.6 million of accelerated depreciation expense for the demolition of the garage.

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.

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Other Income and Expense Items

Income (loss) from Unconsolidated Joint Ventures

For the six months ended June 30, 2023 compared to 2022, income (loss) from unconsolidated joint ventures decreased by approximately $16.4 million primarily due to (1) an approximately $5.3 million decrease in net income due to the acquisition of our 200 Fifth Avenue joint venture, primarily related to depreciation and amortization and (2) an increase in interest expense due to increasing interest rates on variable rate debt.

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 immediately follows the cover page of this Quarterly Report on Form 10-Q.

BXP

Gains on sales of real estate decreased by approximately $118.9 million for the six months ended June 30, 2023 compared to 2022. During the six months ended June 30, 2022, we recognized gains of approximately $22.7 million and $96.2 million related to the sales of 195 West Street in Waltham, Massachusetts and Virginia 95 Office Park in Springfield, Virginia, respectively.

BPLP

Gains on sales of real estate decreased by approximately $123.0 million for the six months ended June 30, 2023 compared to 2022. During the six months ended June 30, 2022, we recognized gains of approximately $23.4 million and $99.5 million related to the sales of 195 West Street in Waltham, Massachusetts and Virginia 95 Office Park in Springfield, Virginia, respectively.

Interest and Other Income (Loss)

Interest and other income (loss) increased by approximately $25.9 million for the six months ended June 30, 2023 compared to 2022, due primarily to an increase of approximately $26.8 million in interest income due to increased interest earned on our deposits partially offset by an increase in our allowance for current expected credit losses of approximately $0.8 million.

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. 11251 Roger Bacon Drive is an approximately 65,000 square foot office building situated on approximately 2.6 acres.

Gains (Losses) from Investments in Securities

Gains (losses) from investments in securities for the six months ended June 30, 2023 and 2022 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 six months ended June 30, 2023 and 2022, we recognized gains (losses) of approximately $3.2 million and $(7.0) million, respectively, on these

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investments. By comparison, our general and administrative expense increased (decreased) by approximately $3.2 million and $(7.0) million during the six months ended June 30, 2023 and 2022, respectively, as a result of increases (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.

Unrealized Gain on Non-Real Estate Investment

During the year ended December 31, 2022, we began investing in non-real estate investments, which are primarily environmentally focused investment funds. As a result, for the six months ended June 30, 2023, we recognized an unrealized gain of approximately $0.4 million due to the observable changes in the fair value of the investments.

Interest Expense

Interest expense increased by approximately $71.3 million for the six months ended June 30, 2023 compared to 2022, as detailed below.

Component	Change in interest expense for the six months ended June 30, 2023 compared to June 30, 2022
	(in thousands)
Increases to interest expense due to:
Increase in interest associated with unsecured term loans and the unsecured credit facility, net	$	29,889
Issuance of $750 million in aggregate principal of 6.750% senior notes due 2027 on November 17, 2022	25,350
Issuance of $750 million in aggregate principal of 6.500% senior notes due 2034 on May 15, 2023	6,113
Increase in interest due to finance lease for one in-service property	4,498
Amortization expense of financing fees primarily related to unsecured term loan	2,313
Decrease in capitalized interest related to development projects	2,271
Other interest expense (excluding senior notes)	876
Total increases to interest expense	$	71,310

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 six months ended June 30, 2023 and 2022 was approximately $21.2 million and $27.8 million, respectively. These costs are not included in the interest expense referenced above.

At June 30, 2023, our variable rate debt consisted of BPLP’s $1.5 billion unsecured credit facility (the “Revolving Facility”) and $1.2 billion 2023 Unsecured Term Loan. As of June 30, 2023, the Revolving Facility did not have a balance outstanding and the 2023 Unsecured Term Loan had $1.2 billion outstanding. On May 2, 2023, BPLP entered into four interest rate swap contracts with notional amounts aggregating $1.2 billion to effectively fix Term SOFR, the reference rate for the 2023 Unsecured Term Loan, at a weighted-average rate of 4.6420% for the period commencing on May 4, 2023 and ending on May 16, 2024. For a summary of our consolidated debt as of June 30, 2023 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.”

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Noncontrolling Interests in Property Partnerships

Noncontrolling interests in property partnerships increased by approximately $2.3 million for the six months ended June 30, 2023 compared to 2022, as detailed below.

Property	Noncontrolling Interests in Property Partnerships for the six months ended June 30,
	2023		2022		Change
	(in thousands)
767 Fifth Avenue (the General Motors Building)	$	6,181	$	6,049	$	132
Times Square Tower	11,098		10,483		615
601 Lexington Avenue (1)	7,253		5,651		1,602
100 Federal Street	6,057		6,421		(364)
Atlantic Wharf Office Building	7,839		7,491		348
	$	38,428	$	36,095	$	2,333

______________

(1)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 decreased by approximately $20.9 million for the six months ended June 30, 2023 compared to 2022 due primarily to a decrease 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.

Results of Operations for the Three Months Ended June 30, 2023 and 2022

Net income attributable to Boston Properties, Inc. and net income attributable to Boston Properties Limited Partnership decreased approximately $118.7 million and $135.7 million, respectively, for the three months ended June 30, 2023 compared to 2022, as detailed in the following tables and for the reasons discussed below under the heading “Comparison of the three months ended June 30, 2023 to the three months ended June 30, 2022” 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 June 30, 2023 and 2022. For a detailed discussion of NOI, including the reasons management believes NOI is useful to investors, see page 67.

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BXP

	Three months ended June 30,
	2023		2022		Increase/ (Decrease)		% Change
	(in thousands)
Net Income Attributable to Boston Properties, Inc.	$	104,299	$	222,989	$	(118,690)	(53.23)	%
Net Income Attributable to Noncontrolling Interests:
Noncontrolling interest—common units of the Operating Partnership	12,117		25,708		(13,591)		(52.87)	%
Noncontrolling interests in property partnerships	19,768		18,546		1,222		6.59	%
Net Income	136,184		267,243		(131,059)		(49.04)	%
Other Expenses:
Add:
Interest expense	142,473		104,142		38,331		36.81	%
Loss from unconsolidated joint ventures	6,668		54		6,614		12,248.15	%
Other Income:
Less:
Unrealized gain on non-real estate investment	124		—		124		100.00	%
Gains (losses) from investments in securities	1,571		(4,716)		6,287		133.31	%
Other income - assignment fee	—		6,624		(6,624)		(100.00)	%
Interest and other income (loss)	17,343		1,195		16,148		1,351.30	%
Gains on sales of real estate	—		96,247		(96,247)		(100.00)	%
Other Expenses:
Add:
Depreciation and amortization expense	202,577		183,146		19,431		10.61	%
Transaction costs	308		496		(188)		(37.90)	%
Payroll and related costs from management services contracts	4,609		3,239		1,370		42.30	%
General and administrative expense	44,175		34,665		9,510		27.43	%
Other Revenue:
Less:
Direct reimbursements of payroll and related costs from management services contracts	4,609		3,239		1,370		42.30	%
Development and management services revenue	9,858		6,354		3,504		55.15	%
Net Operating Income	$	503,489	$	484,042	$	19,447	4.02	%

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BPLP

	Three months ended June 30,
	2023		2022		Increase/ (Decrease)		% Change
	(in thousands)
Net Income Attributable to Boston Properties Limited Partnership	$	118,098	$	253,788	$	(135,690)	(53.47)	%
Net Income Attributable to Noncontrolling Interests:
Noncontrolling interests in property partnerships	19,768		18,546		1,222		6.59	%
Net Income	137,866		272,334		(134,468)		(49.38)	%
Other Expenses:
Add:
Interest expense	142,473		104,142		38,331		36.81	%
Loss from unconsolidated joint ventures	6,668		54		6,614		12,248.15	%
Other Income:
Less:
Unrealized gain on non-real estate investment	124		—		124		100.00	%
Gains (losses) from investments in securities	1,571		(4,716)		6,287		133.31	%
Other income - assignment fee	—		6,624		(6,624)		(100.00)	%
Interest and other income (loss)	17,343		1,195		16,148		1,351.30	%
Gains on sales of real estate	—		99,608		(99,608)		(100.00)	%
Other Expenses:
Add:
Depreciation and amortization expense	200,895		181,416		19,479		10.74	%
Transaction costs	308		496		(188)		(37.90)	%
Payroll and related costs from management services contracts	4,609		3,239		1,370		42.30	%
General and administrative expense	44,175		34,665		9,510		27.43	%
Other Revenue:
Less:
Direct reimbursements of payroll and related costs from management services contracts	4,609		3,239		1,370		42.30	%
Development and management services revenue	9,858		6,354		3,504		55.15	%
Net Operating Income	$	503,489	$	484,042	$	19,447	4.02	%

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, 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) unrealized gain on non-real estate investment, 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. 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.

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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 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 June 30, 2023 to the three months ended June 30, 2022

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 38.3 million net rentable square feet, excluding unconsolidated joint ventures. The Same Property Portfolio includes properties acquired or placed in-service on or prior to April 1, 2022 and owned and in-service through June 30, 2023. The Total Property Portfolio includes the effects of the other properties either acquired, placed in-service, in or held for development or redevelopment after April 1, 2022 or disposed of on or prior to June 30, 2023. This table includes a reconciliation from the Same Property Portfolio to the Total Property Portfolio by also providing information for the three months ended June 30, 2023 and 2022 with respect to the properties that were acquired, placed in-service, in or held for development or redevelopment or sold.

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	Same Property Portfolio								Properties Acquired Portfolio				Properties Placed In-Service Portfolio				Properties in or Held for Development or Redevelopment Portfolio				Properties Sold Portfolio				Total Property Portfolio
	2023		2022		Increase/ (Decrease)		% Change		2023		2022		2023		2022		2023		2022		2023		2022		2023		2022		Increase/ (Decrease)		% Change
	(dollars in thousands)
Rental Revenue: (1)
Lease Revenue (Excluding Termination Income)	$	689,485	$	673,769	$	15,716	2.33	%	$	26,433	$	5,815	$	33,404	$	8,310	$	751	$	5,870	$	355	$	12,761	$	750,428	$	706,525	$	43,903	6.21	%
Termination Income	(164)		1,789		(1,953)		(109.17)	%	—		133		—		—		—		—		—		—		(164)		1,922		(2,086)		(108.53)	%
Lease Revenue	689,321		675,558		13,763		2.04	%	26,433		5,948		33,404		8,310		751		5,870		355		12,761		750,264		708,447		41,817		5.90	%
Parking and Other Revenue	24,559		23,543		1,016		4.32	%	1,164		524		476		—		—		2,491		1		328		26,200		26,886		(686)		(2.55)	%
Total Rental Revenue (1)	713,880		699,101		14,779		2.11	%	27,597		6,472		33,880		8,310		751		8,361		356		13,089		776,464		735,333		41,131		5.59	%
Real Estate Operating Expenses	270,149		253,044		17,105		6.76	%	4,103		1,680		9,579		2,944		1,336		2,310		86		4,052		285,253		264,030		21,223		8.04	%
Net Operating Income (Loss), Excluding Residential and Hotel	443,731		446,057		(2,326)		(0.52)	%	23,494		4,792		24,301		5,366		(585)		6,051		270		9,037		491,211		471,303		19,908		4.22	%
Residential Net Operating Income (2)	6,470		5,214		1,256		24.09	%	—		—		—		—		—		—		—		1,880		6,470		7,094		(624)		(8.80)	%
Hotel Net Operating Income (2)	5,808		5,645		163		2.89	%	—		—		—		—		—		—		—		—		5,808		5,645		163		2.89	%
Net Operating Income (Loss)	$	456,009	$	456,916	$	(907)	(0.20)	%	$	23,494	$	4,792	$	24,301	$	5,366	$	(585)	$	6,051	$	270	$	10,917	$	503,489	$	484,042	$	19,447	4.02	%

_______________

(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 67. Residential Net Operating Income for the three months ended June 30, 2023 and 2022 is comprised of Residential Revenue of $12,253 and $16,912 less Residential Expenses of $5,783 and $9,818, respectively. Hotel Net Operating Income for the three months ended June 30, 2023 and 2022 is comprised of Hotel Revenue of $13,969 and $12,089 less Hotel Expenses of $8,161 and $6,444, respectively, per the Consolidated Statements of Operations.

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Same Property Portfolio

Lease Revenue (Excluding Termination Income)

Lease revenue (excluding termination income) from the Same Property Portfolio increased by approximately $15.7 million for the three months ended June 30, 2023 compared to 2022. The increase was a result of our average revenue per square foot increasing by approximately $2.75, contributing approximately $25.1 million, partially offset by an approximately $9.4 million decrease due to our average occupancy decreasing from 91.6% to 90.3%.

Termination Income

Termination income decreased by approximately $2.0 million for the three months ended June 30, 2023 compared to 2022.

Termination income for the three months ended June 30, 2023 related to 10 clients across the Same Property Portfolio and totaled approximately $(164,000).

Termination income for the three months ended June 30, 2022 related to six clients across the Same Property Portfolio and totaled approximately $1.8 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 $1.0 million for the three months ended June 30, 2023 compared to 2022. Parking revenue increased by approximately $1.2 million and was partially offset by a decrease in other revenue of approximately $0.2 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 $17.1 million, or 6.8%, for the three months ended June 30, 2023 compared to 2022, due primarily to increases in real estate taxes of approximately $5.0 million, or 4.0%, and other real estate operating expenses of approximately $9.8 million, or 7.7%. The increase in real estate taxes was primarily in New York City. In addition, there was approximately $2.3 million related to the marketing and initial opening expenses associated with the View Boston Observatory which was completed and placed in-service on June 1, 2023.

Properties Acquired Portfolio

The table below lists the properties acquired between April 1, 2022 and June 30, 2023. Rental revenue and real estate operating expenses increased by approximately $21.1 million and $2.4 million, respectively, for the three months ended June 30, 2023 compared to 2022, as detailed below.

		Square Feet	Rental Revenue						Real Estate Operating Expenses
Name	Date acquired		2023		2022		Change		2023		2022		Change
			(dollars in thousands)
Madison Centre (1)	May 17, 2022	754,988	$	17,056	$	6,472	$	10,584	$	3,083	$	1,680	$	1,403
125 Broadway	September 16, 2022	271,000	10,541		—		10,541		1,020		—		1,020
		1,025,988	$	27,597	$	6,472	$	21,125	$	4,103	$	1,680	$	2,423

______________

(1)Rental revenue for the three months ended June 30, 2022 includes approximately $0.1 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 April 1, 2022 and June 30, 2023. Rental revenue and real estate operating expenses from our Properties Placed In-Service Portfolio increased by approximately $25.6 million and $6.6 million, respectively, for the three months ended June 30, 2023 compared to 2022, as detailed below.

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	Quarter Initially Placed In-Service	Quarter Fully Placed In-Service		Rental Revenue						Real Estate Operating Expenses
Name			Square Feet	2023		2022		Change		2023		2022		Change
				(dollars in thousands)
Reston Next	Fourth Quarter, 2021	Fourth Quarter, 2022	1,063,236	$	11,412	$	8,088	$	3,324	$	3,876	$	2,917	$	959
325 Main Street	Second Quarter, 2022	Second Quarter, 2022	414,565	11,353		213		11,140		1,937		10		1,927
2100 Pennsylvania Avenue	Second Quarter, 2022	Second Quarter, 2023	475,849	5,440		9		5,431		2,433		17		2,416
880 Winter Street (1)	Third Quarter, 2022	Fourth Quarter, 2022	243,618	5,675		—		5,675		1,333		—		1,333
			2,197,268	$	33,880	$	8,310	$	25,570	$	9,579	$	2,944	$	6,635

______________

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

Properties in or Held for Development or Redevelopment Portfolio

The table below lists the properties that were in or held for development or redevelopment between April 1, 2022 and June 30, 2023. Rental revenue and real estate operating expenses from our Properties in or Held for Development or Redevelopment Portfolio decreased by approximately $7.6 million and $1.0 million, respectively, for the three months ended June 30, 2023 compared to 2022, as detailed below.

			Rental Revenue						Real Estate Operating Expenses
Name	Date Commenced or Held for Development / Redevelopment	Square Feet	2023		2022		Change		2023		2022		Change
			(dollars in thousands)
140 Kendrick Street - Building A (1)	July 1, 2022	104,000	$	—	$	1,762	$	(1,762)	$	—	$	346	$	(346)
760 Boylston Street	September 12, 2022	118,000	—		—		—		—		207		(207)
105 Carnegie Center	November 30, 2022	73,000	—		329		(329)		—		228		(228)
2096 Gaither Road	December 1, 2022	50,000	—		58		(58)		24		75		(51)
RTC Next-Hotel (2)	December 19, 2022	N/A	254		—		254		—		—		—
Kendall Center Blue Parking Garage (3)	January 4, 2023	N/A	—		2,486		(2,486)		—		332		(332)
300 Binney Street	January 30, 2023	236,000	—		2,938		(2,938)		738		472		266
Lexington Office Park (4)	March 31, 2023	166,779	346		626		(280)		497		565		(68)
2098 Gaither Road (4)	March 31, 2023	50,000	151		162		(11)		77		85		(8)
		797,779	$	751	$	8,361	$	(7,610)	$	1,336	$	2,310	$	(974)

______________

(1)On July 20, 2023, we completed and fully placed this property in-service.

(2)On December 19, 2022, in accordance with GAAP, the ground lease that encumbers this property was reclassified as a sales-type lease and the associated assets were derecognized.

(3)The Kendall Center Blue Parking Garage was taken out of service on January 4, 2023 to support the development of 290 Binney Street. Real estate operating expenses for the three months ended June 30, 2023 included approximately $0.7 million of demolition costs

(4)Lexington Office Park and 2098 Gaither Road are no longer considered “in-service” as each property’s occupied percentage is below 50% and we are no longer actively leasing the properties in anticipation of a future development/redevelopment.

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Properties Sold Portfolio

The table below lists the properties we sold between April 1, 2022 and June 30, 2023. Rental revenue and real estate operating expenses from our Properties Sold Portfolio decreased by approximately $15.8 million and $5.2 million, respectively, for the three months ended June 30, 2023 compared to 2022, as detailed below.

				Rental Revenue						Real Estate Operating Expenses
Name	Date Sold	Property Type	Square Feet	2023		2022		Change		2023		2022		Change
				(dollars in thousands)
Office
Virginia 95 Office Park	June 15, 2022	Office/Flex	733,421	$	—	$	2,354	$	(2,354)	$	—	$	825	$	(825)
601 Massachusetts Avenue	August 30, 2022	Office	478,667	—		10,735		(10,735)		—		3,227		(3,227)
			1,212,088	—		13,089		(13,089)		—		4,052		(4,052)
Residential
The Avant at Reston Town Center (1)	November 8, 2022	Residential	329,195	356		3,089		(2,733)		86		1,209		(1,123)
Total Residential			329,195	356		3,089		(2,733)		86		1,209		(1,123)
			1,541,283	$	356	$	16,178	$	(15,822)	$	86	$	5,261	$	(5,175)

______________

(1)We retained and continue to own approximately 26,000 square feet of ground-level retail space. Rental Revenue and Real Estate Operating Expenses for the three months ended June 30, 2023 represent the ground-level retail space. Rental Revenue and Real Estate Operating Expenses for the three months ended June 30, 2022 represent the entire property and not just the portion sold.

Residential Net Operating Income

Net operating income for our residential same properties increased by approximately $1.3 million for the three months ended June 30, 2023 compared to 2022.

The following reflects our occupancy and rate information for our residential same properties for the three months ended June 30, 2023 and 2022.

	Average Monthly Rental Rate (1)						Average Rental Rate Per Occupied Square Foot						Average Physical Occupancy (2)						Average Economic Occupancy (3)
Name	2023		2022		Change (%)		2023		2022		Change (%)		2023		2022		Change (%)		2023		2022		Change (%)
Proto Kendall Square	$	3,065	$	2,774	10.5	%	$	5.62	$	5.11	10.0	%	95.8	%	95.2	%	0.6	%	95.8	%	94.3	%	1.6	%
The Lofts at Atlantic Wharf	$	4,440	$	4,097	8.4	%	$	4.91	$	4.57	7.4	%	96.5	%	97.7	%	(1.2)	%	97.5	%	97.1	%	0.4	%
Signature at Reston	$	2,663	$	2,683	(0.7)	%	$	2.77	$	2.77	—	%	94.6	%	95.1	%	(0.5)	%	93.6	%	94.8	%	(1.3)	%
The Skylyne	$	3,447	$	3,391	1.7	%	$	4.39	$	4.15	5.8	%	92.4	%	83.8	%	10.3	%	89.9	%	81.7	%	10.0	%

_______________  

(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.

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Hotel Net Operating Income

The Boston Marriott Cambridge hotel had net operating income of approximately $5.8 million for the three months ended June 30, 2023, representing an increase of approximately $0.2 million compared to the three months ended June 30, 2022.

The following reflects our occupancy and rate information for the Boston Marriott Cambridge hotel for the three months ended June 30, 2023 and 2022.

	2023			2022			Change (%)
Occupancy	77.2		%	73.5		%	5.0	%
Average daily rate	$	371.58		$	349.99		6.2	%
REVPAR	$	286.79		$	257.32		11.5	%

Other Operating Revenue and Expense Items

Development and Management Services Revenue

Development and management services revenue increased by approximately $3.5 million for the three months ended June 30, 2023 compared to 2022. Development services revenue and management services revenue increased by approximately $1.3 million and $2.2 million, respectively. The increase in development management services revenue was primarily related to an increase in development fees from unconsolidated joint ventures in the Washington, DC region. The increase in management services revenue was primarily related to an increase in property management fees earned from an unconsolidated joint venture in New York City and a third-party owned building in the Washington, DC region and asset management fees earned from an unconsolidated joint venture in the Los Angeles region.

General and Administrative Expense

General and administrative expense increased by approximately $9.5 million for the three months ended June 30, 2023 compared to 2022 primarily due to increases in compensation expense and other general and administrative expenses of approximately $8.8 million and $0.7 million, respectively. The increase in compensation expense was related to (1) an approximately $6.3 million increase in the value of our deferred compensation plan and (2) an approximately $2.5 million increase in other compensation expenses, primarily due to age-based vesting and annual increases in employee compensation. The increase in other general and administrative expenses 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 June 30, 2023 and 2022 were approximately $4.6 million and $4.1 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 June 30, 2023 compared to 2022 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 immediately follows the cover page of this Quarterly Report on Form 10-Q.

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BXP

Depreciation and amortization expense increased by approximately $19.4 million for the three months ended June 30, 2023 compared to 2022, as detailed below.

Portfolio	Depreciation and Amortization for the three months ended June 30,
	2023		2022		Change
	(in thousands)
Same Property Portfolio	$	170,684	$	170,690	$	(6)
Properties Acquired Portfolio	19,224		4,174		15,050
Properties Placed In-Service Portfolio	12,213		3,698		8,515
Properties in or Held for Development or Redevelopment Portfolio	344		1,631		(1,287)
Properties Sold Portfolio	112		2,953		(2,841)
	$	202,577	$	183,146	$	19,431

BPLP

Depreciation and amortization expense increased by approximately $19.5 million for the three months ended June 30, 2023 compared to 2022, as detailed below.

Portfolio	Depreciation and Amortization for the three months ended June 30,
	2023		2022		Change
	(in thousands)
Same Property Portfolio	$	169,002	$	168,960	$	42
Properties Acquired Portfolio	19,224		4,174		15,050
Properties Placed In-Service Portfolio	12,213		3,698		8,515
Properties in or Held for Development or Redevelopment Portfolio	344		1,631		(1,287)
Properties Sold Portfolio	112		2,953		(2,841)
	$	200,895	$	181,416	$	19,479

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 June 30, 2023 compared to 2022, loss from unconsolidated joint ventures increased by approximately $6.6 million due primarily to an increase in interest expense due to increasing interest rates on variable rate debt.

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 immediately follows the cover page of this Quarterly Report on Form 10-Q.

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BXP

Gains on sales of real estate decreased by approximately $96.2 million for the three months ended June 30, 2023 compared to 2022. During the three months ended June 30, 2022, we recognized a gain of approximately $96.2 million related to the sale of Virginia 95 Office Park in Springfield, Virginia.

BPLP

Gains on sales of real estate decreased by approximately $99.6 million for the three months ended June 30, 2023 compared to 2022. During the three months ended June 30, 2022, we recognized a gain of approximately $99.5 million related to the sale of Virginia 95 Office Park in Springfield, Virginia.

Interest and Other Income (Loss)

Interest and other income (loss) increased by approximately $16.1 million for the three months ended June 30, 2023 compared to 2022, due primarily to an increase of approximately $16.7 million in interest income from increased interest earned on our deposits partially offset by an increase in our allowance for current expected credit losses of approximately $0.4 million.

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. 11251 Roger Bacon Drive is an approximately 65,000 square foot office building situated on approximately 2.6 acres.

Gains (Losses) from Investments in Securities

Gains (losses) from investments in securities for the three months ended June 30, 2023 and 2022 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 three months ended June 30, 2023 and 2022, we recognized gains (losses) of approximately $1.6 million and $(4.7) million, respectively, on these investments. By comparison, our general and administrative expense increased (decreased) by approximately $1.6 million and $(4.7) million during the three months ended June 30, 2023 and 2022, respectively, as a result of increases (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.

Unrealized Gain on Non-Real Estate Investment

During the year ended December 31, 2022, we began investing in non-real estate investments, which are primarily environmentally-focused investment funds. As a result, for the three months ended June 30, 2023, we recognized an unrealized gain of approximately $0.1 million due to the observable changes in the fair value of the investments.

Interest Expense

Interest expense increased by approximately $38.3 million for the three months ended June 30, 2023 compared to 2022, as detailed below.

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Component	Change in interest expense for the three months ended June 30, 2023 compared to June 30, 2022
	(in thousands)
Increases to interest expense due to:
Increase in interest associated with unsecured term loans and unsecured credit facility, net	$	14,217
Issuance of $750 million in aggregate principal of 6.750% senior notes due 2027 on November 17, 2022	12,675
Issuance of $750 million in aggregate principal of 6.500% senior notes due 2034 on May 15, 2023	6,113
Increase in interest due to finance lease for one in-service property	2,604
Decrease in capitalized interest related to development projects	963
Amortization expense of financing fees primarily related to unsecured term loan	927
Other interest expense (excluding senior notes)	832
Total increases to interest expense	$	38,331

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 June 30, 2023 and 2022 was approximately $10.6 million and $14.1 million, respectively. These costs are not included in the interest expense referenced above.

At June 30, 2023, our variable rate debt consisted of BPLP’s $1.5 billion Revolving Facility and $1.2 billion 2023 Unsecured Term Loan. As of June 30, 2023, the Revolving Facility did not have a balance outstanding and the 2023 Unsecured Term Loan had $1.2 billion outstanding. On May 2, 2023, BPLP entered into four interest rate swap contracts with notional amounts aggregating $1.2 billion to effectively fix Term SOFR, the reference rate for the 2023 Unsecured Term Loan, at a weighted-average rate of 4.6420% for the period commencing on May 4, 2023 and ending on May 16, 2024. For a summary of our consolidated debt as of June 30, 2023 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 $1.2 million for the three months ended June 30, 2023 compared to 2022, as detailed below.

Property	Noncontrolling Interests in Property Partnerships for the three months ended June 30,
	2023		2022		Change
	(in thousands)
767 Fifth Avenue (the General Motors Building) (1)	$	3,778	$	3,012	$	766
Times Square Tower	5,415		5,183		232
601 Lexington Avenue	3,242		3,372		(130)
100 Federal Street	3,245		3,258		(13)
Atlantic Wharf Office Building	4,088		3,721		367
	$	19,768	$	18,546	$	1,222

_______________

(1)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 decreased by approximately $13.6 million for the three months ended June 30, 2023 compared to 2022 due primarily to a decrease in allocable

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income, which included 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 and balloon payments on maturing debt, including $500 million of 3.125% unsecured senior notes due September 1, 2023 and $700 million of 3.800% unsecured senior notes due February 1, 2024;

•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 and interests in joint ventures owning real estate;

•private equity sources, including 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.

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The following table presents information on properties under construction/redevelopment as of June 30, 2023 (dollars in thousands):

									Financings
Construction/Redevelopment 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 June 30, 2023 (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	$	21,392	$	26,600	$	—	$	—	$	5,208	100	%	(6)
360 Park Avenue South (42% ownership)	Fourth Quarter, 2025	New York, NY	1	450,000	204,056		248,000		92,774		91,371		42,541		2	%	(7)
Reston Next Office Phase II	Second Quarter, 2025	Reston, VA	1	90,000	35,535		61,000		—		—		25,465		—	%
Total Office Properties under Construction/Redevelopment			3	644,000	260,983		335,600		92,774		91,371		73,214		18	%
Laboratory/Life Sciences
751 Gateway (49% ownership)	Fourth Quarter, 2023	South San Francisco, CA	1	231,000	103,738		127,600		—		—		23,862		100	%
103 CityPoint	Third Quarter, 2024	Waltham, MA	1	113,000	75,251		115,100		—		—		39,849		—	%
180 CityPoint	Fourth Quarter, 2024	Waltham, MA	1	329,000	191,337		274,700		—		—		83,363		43	%
300 Binney Street (Redevelopment)	First Quarter, 2025	Cambridge, MA	1	236,000	22,359		210,200		—		—		187,841		100	%
105 Carnegie Center (Redevelopment)	Second Quarter, 2025	Princeton, NJ	1	73,000	1,868		40,600		—		—		38,732		—	%
651 Gateway (50% ownership) (Redevelopment)	Fourth Quarter, 2025	South San Francisco, CA	1	327,000	76,106		146,500		—		—		70,394		14	%
290 Binney Street	Second Quarter, 2026	Cambridge, MA	1	566,000	152,817		1,185,200		—		—		1,032,383		100	%
Total Laboratory/Life Sciences Properties under Construction/Redevelopment			7	1,875,000	623,476		2,099,900		—		—		1,476,424		65	%
Residential
Reston Next Residential (508 units) (20% ownership)	Second Quarter, 2026	Reston, VA	1	417,000	23,324		47,700		28,000		7,913		4,289		—	%
Total Residential Property under Construction			1	417,000	23,324		47,700		28,000		7,913		4,289		—
Retail
760 Boylston Street (Redevelopment)	Second Quarter, 2024	Boston, MA	1	118,000	9,643		43,800		—		—		34,157		100	%
Reston Next Retail	Fourth Quarter, 2025	Reston, VA	1	33,000	20,610		26,600		—		—		5,990		—	%
Total Retail Properties under Construction/Redevelopment			2	151,000	30,253		70,400		—		—		40,147		78	%
Total Properties under Construction/Redevelopment			13	3,087,000	$	938,036	$	2,553,600	$	120,774	$	99,284	$	1,594,074	54	%	(8)

___________  

(1)Represents our share.

(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 June 30, 2023.

(3)Includes approximately $167.1 million of unpaid but accrued construction costs and leasing commissions.

(4)Excludes approximately $167.1 million of unpaid but accrued construction costs and leasing commissions.

(5)Represents percentage leased as of July 28, 2023, including leases with future commencement dates.

(6)The redevelopment project was completed and fully placed in-service on July 20, 2023.

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(7)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.

(8)Percentage leased excludes the residential property.

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Lease revenue (which includes reimbursement of operating expenses from clients, if any), other income from operations, available cash balances, proceeds from mortgage financings and offerings of unsecured indebtedness, draws on BPLP’s Revolving Facility, and funding from institutional private equity partners 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 our current and committed development and redevelopment projects, repay debt maturities (as discussed below), service the interest payments on our outstanding indebtedness, and satisfy our REIT distribution requirements.

As of June 30, 2023, we had 13 properties under development or redevelopment. Our share of the estimated total investment for these projects is approximately $2.6 billion, of which approximately $1.6 billion remains to be funded primarily with equity through 2026. In the second quarter of 2023, we completed the development/redevelopment of:

•2100 Pennsylvania Avenue, an approximately 476,000 square foot premier workplace located in Washington, DC, for an estimated total investment of $375.9 million. The property was 91% leased, including leases with future commencement dates, as of July 28, 2023.

•View Boston Observatory, an observatory encompassing the top three floors of 800 Boylston Street - The Prudential Center in Boston, Massachusetts, for an estimated total investment of $182.3 million.

On July 20, 2023, we completed the redevelopment of and fully placed in-service 140 Kendrick Street - Building A, a premier workplace redevelopment project with approximately 104,000 net rentable square feet located in Needham, Massachusetts. The property is 100% leased and is the first Net Zero, Carbon Neutral office repositioning of this scale in Massachusetts.

During the second quarter of 2023, a joint venture in which we have a 55% interest elected to pause vertical construction on Platform 16 in San Jose, California. Our share of the estimated total investment to complete Phase 1 of the project was approximately $231.9 million. As of June 30, 2023, we had invested approximately $100.5 million in this phase of the development project, and we expect to invest an estimated additional $45.8 million to complete the underground parking garage and building foundation elements to facilitate a restart of construction in the future as demand improves.

On July 28, 2023, we entered into a joint venture agreement with an institutional investor for the future development of 343 Madison Avenue located on Madison Avenue between 44th and 45th Streets in New York City, New York adjacent to Grand Central Station. We own a 55% interest in the venture and our partner owns a 45% interest, and we will provide customary development, property management, and leasing services. The 343 Madison Avenue project contemplates the construction of (1) a direct entrance to the Long Island Railroad’s new east side access project (Grand Central Madison) (“Phase 1”) and (2) an approximately 900,000 square foot premier workplace building with ground floor retail (“Phase 2”). Subsequently, on August 1, 2023, the joint venture executed a 99-year ground lease with the Metropolitan Transportation Authority for the approximately 25,000 square foot site. The ground lease requires the joint venture to construct the direct access to Grand Central Madison as Phase 1 of the development project. The joint venture has the option until July 31, 2025 to terminate the ground lease prior to construction of the new building and receive reimbursement for the cost of the construction of access to Grand Central Station. There can be no assurance that Phase 1 will be completed on the terms currently contemplated or that Phase 2 of the development project will commence on the terms currently contemplated or at all.

During the second quarter of 2023, BPLP completed a public offering of $750.0 million aggregate principal amount of 6.500% unsecured senior notes due 2034. The net proceeds from the offering were approximately $741.3 million, which will be used to repay at maturity $500.0 million aggregate principal amount of BPLP’s 3.125% senior unsecured notes, which mature on September 1, 2023, and for general corporate purposes.

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On May 2, 2023, we entered into four interest rate swap contracts with notional amounts aggregating $1.2 billion. We entered into these interest rate swap contracts to reduce our exposure to the variability in future cash flows attributable to changes in the interest rates on our 2023 Unsecured Term Loan. These interest rate swaps fixed Term SOFR, the reference rate for the 2023 Unsecured Term Loan, at a weighted average rate of 4.6420% for the period commencing on May 4, 2023 and ending on May 16, 2024.

On July 28, 2023, a joint venture in which we have a 50% interest modified and exercised an option to extend by one year the maturity date of its loan collateralized by 100 Causeway Street. At the time of the modification and extension, the loan had an outstanding balance totaling approximately $340.6 million, bore interest at Term SOFR plus 1.60% per annum, and was scheduled to mature on September 5, 2023. The modified and extended loan has an outstanding balance of $336.6 million, which included an approximately $4.0 million principal repayment, bears interest at Term SOFR plus 1.48% per annum, and matures on September 5, 2024, with an additional one-year extension option, subject to certain conditions. 100 Causeway Street is an approximately 634,000 square foot premier workplace located in Boston, Massachusetts and is approximately 95% leased.

Our 2024 debt maturities include $700.0 million aggregate principal amount of BPLP’s 3.800% senior unsecured notes, which mature on February 1, 2024 and the $1.2 billion 2023 Unsecured Term Loan (unless we exercise the one-year extension option within the loan agreement, subject to certain conditions). In our unconsolidated joint venture portfolio, after refinancing the mortgage debt at 500 North Capitol Street, NW, in Washington, DC, we have approximately $577.2 million (our share) of debt maturing through the end of 2024. We expect to fund the foregoing debt maturities using available cash balances, proceeds from asset sales, draws on BPLP’s Revolving Facility, and/or through refinancings using secured debt, unsecured debt or both. We expect our quarterly net interest expense will increase moderately for the remainder of 2023 and into 2024 compared to the first half of 2023 primarily due to the cessation of capitalized interest on our 2023 development deliveries, higher interest rates on maturing debt, and lower interest income as we use cash balances to repay debt and fund our development pipeline.

As of July 28, 2023, we had available cash of approximately $1.4 billion (of which approximately $81.7 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 $1.5 billion available under BPLP’s Revolving Facility and our available cash, as of July 28, 2023, are sufficient to fund our remaining capital requirements on existing development and redevelopment projects, fund acquisitions, repay our maturing indebtedness when due (if not refinanced), 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. Doing so may result in us carrying additional cash and cash equivalents pending our use of the proceeds, which would increase our net interest expense.

On May 17, 2023, BXP renewed its 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 May 22, 2023. BXP intends to use the net proceeds from any offering for general business purposes, which may include investment opportunities and debt reduction. We have not sold any shares under this ATM stock 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 distribution per unit that is paid per share of BXP common stock.

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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.

Cash and cash equivalents and cash held in escrows aggregated approximately $1.6 billion and $502.9 million at June 30, 2023 and 2022, respectively, representing an increase of approximately $1.1 billion. The following table sets forth changes in cash flows:

	Six months ended June 30,
	2023		2022		Change
	(in thousands)
Net cash provided by operating activities	$	613,183	$	616,639	$	(3,456)
Net cash used in investing activities	(554,864)		(980,170)		425,306
Net cash provided by financing activities	833,359		365,223		468,136

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 7.6 years as of June 30, 2023, 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 six months ended June 30, 2023 and June 30, 2022 is detailed below:

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	Six months ended June 30,
	2023		2022
	(in thousands)
Acquisitions of real estate (1)	$	—	$	(727,835)
Construction in progress (2)	(235,331)		(237,182)
Building and other capital improvements	(78,344)		(63,278)
Tenant improvements	(135,743)		(97,844)
Proceeds from sales of real estate (3)	—		157,345
Proceeds from assignment fee (4)	—		6,624
Capital contributions to unconsolidated joint ventures (5)	(103,595)		(69,819)
Capital distributions from unconsolidated joint ventures (6)	7,350		36,622
Investment in non-real estate investments	(733)		—
Issuance of related party note receivable (7)	(10,500)		—
Proceeds from note receivable (8)	—		10,000
Investments in securities, net	2,032		5,197
Net cash used in investing activities	$	(554,864)	$	(980,170)

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

(1)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.

(2)Construction in progress for the six months ended June 30, 2023 included ongoing expenditures associated with 2100 Pennsylvania Avenue and the View Boston Observatory at The Prudential Center, which were both fully placed in-service during the six months ended June 30, 2023. In addition, we incurred costs associated with our continued development/redevelopment of 180 CityPoint, 103 CityPoint, Reston Next Office Phase II, 140 Kendrick Street Building A, 760 Boylston Street, 105 Carnegie Center, 290 Binney Street and 300 Binney Street.

Construction in progress for the six months ended June 30, 2022 included ongoing expenditures associated with Reston Next and 2100 Pennsylvania Avenue, which are partially placed in-service, and 325 Main Street, which was completed and fully placed in-service during the six months ended June 30, 2022. In addition, we incurred costs associated with our continued development/redevelopment of 180 CityPoint, View Boston Observatory at The Prudential Center, 880 Winter Street, 103 CityPoint and Reston Next Office Phase II.

(3)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 Class A 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 premier workplace.

(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.

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(5)Capital contributions to unconsolidated joint ventures for the six months ended June 30, 2023 consisted primarily of cash contributions of approximately $30.2 million, $26.5 million, $17.5 million, $10.9 million and $8.3 million to our Gateway Commons, Platform 16, Worldgate Drive, Dock 72 and 751 Gateway joint ventures, respectively. On January 31, 2023, we entered into a new joint venture for 13100 and 13150 Worldgate Drive located in Herndon, Virginia.

Capital contributions to unconsolidated joint ventures for the six months ended June 30, 2022 consisted primarily of cash contributions of approximately $32.6 million and $22.0 million to our Gateway Commons and Platform 16 joint ventures, respectively.

(6)Capital distributions from unconsolidated joint ventures for the six months ended June 30, 2023 consisted primarily of a cash distribution totaling approximately $7.4 million from our 360 Park Avenue South joint venture.

Capital distributions from unconsolidated joint ventures for the six months ended June 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 June 5, 2023, a joint venture in which we own a 30% interest repaid the existing construction loan collateralized by its 500 North Capitol Street, NW property and obtained new mortgage loans with related parties. At the time of the pay off, the outstanding balance of the loan totaled approximately $105.0 million and was scheduled to mature on June 6, 2023. The new mortgage loans have an aggregate principal balance of $105.0 million, bear interest at a weighted average fixed rate of 6.83% per annum and mature on June 5, 2026. Our portion of the mortgage loans, $10.5 million, has been reflected as a Related Party Note Receivable on our Consolidated Balance Sheets. 500 North Capitol Street, NW is a 231,000 square foot premier workplace in Washington, DC.

(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 six months ended June 30, 2023 totaled approximately $833.4 million. This amount consisted primarily of borrowings under the 2023 Unsecured Term Loan and the proceeds from the issuance by BPLP of $750 million in aggregate principal amount of its 6.500% unsecured senior notes due 2034, partially offset by the repayment of BPLP’s $730 million unsecured credit agreement (the “2022 Unsecured Term Loan”) and 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):

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	June 30, 2023
	Shares / Units Outstanding	Common Stock Equivalent	Equivalent Value (1)
Common Stock	156,853	156,853	$	9,033,164
Common Operating Partnership Units	18,658	18,658	1,074,514			(2)
Total Equity		175,511	$	10,107,678
Consolidated Debt			$	15,456,205
Add:
BXP’s share of unconsolidated joint venture debt (3)			1,609,671
Subtract:
Partners’ share of Consolidated Debt (4)			(1,359,380)
BXP’s Share of Debt			$	15,706,496
Consolidated Market Capitalization			$	25,563,883
BXP’s Share of Market Capitalization			$	25,814,174
Consolidated Debt/Consolidated Market Capitalization			60.46		%
BXP’s Share of Debt/BXP’s Share of Market Capitalization			60.84		%

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(1)Values are based on the closing price per share of BXP’s Common Stock on the New York Stock Exchange on June 30, 2023 of $57.59.

(2)Includes long-term incentive plan units (including 2012 OPP Units and 2013 - 2020 MYLTIP Units) but excludes the 2021 - 2023 MYLTIP Units because the three-year performance periods had not ended as of June 30, 2023.

(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:

(1)     our consolidated debt; plus

(2)     the product of (x) the closing price per share of BXP Common Stock on June 30, 2023, 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 - 2020 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, 2021 - 2023 MYLTIP Units are not included in this calculation as of June 30, 2023.

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

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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.”

Debt Financing

As of June 30, 2023, we had approximately $15.5 billion of outstanding consolidated indebtedness, representing approximately 60.46% of our Consolidated Market Capitalization as calculated above consisting of approximately (1) $11.0 billion (net of discount and deferred financing fees) in publicly traded unsecured senior notes having a GAAP weighted-average interest rate of 3.88% per annum and maturities in 2023 through 2034, (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 5.3 years and (3) $1.2 billion outstanding under BPLP’s 2023 Unsecured Term Loan that matures on May 16, 2024.

The table below summarizes the aggregate carrying value of our mortgage notes payable and BPLP’s unsecured senior notes, unsecured line of credit, and unsecured term loan, as well as Consolidated Debt Financing Statistics at June 30, 2023 and June 30, 2022.  

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	June 30,
	2023			2022
	(dollars in thousands)
Debt Summary:
Balance
Fixed rate mortgage notes payable, net	$	3,274,764		$	3,269,948
Unsecured senior notes, net	10,985,395			9,489,030
Unsecured line of credit	—			165,000
Unsecured term loan, net	1,196,046			728,795
Consolidated Debt	15,456,205			13,652,773
Add:
BXP’s share of unconsolidated joint venture debt, net (1)	1,609,671			1,446,617
Subtract:
Partners’ share of consolidated mortgage notes payable, net (2)	(1,359,380)			(1,357,399)
BXP’s Share of Debt	$	15,706,496		$	13,741,991
	June 30,
	2023			2022
Consolidated Debt Financing Statistics:
Percent of total debt:
Fixed rate (3)	100.00		%	93.45		%
Variable rate	—		%	6.55		%
Total	100.00		%	100.00		%
GAAP Weighted-average interest rate at end of period:
Fixed rate (3)	3.95		%	3.43		%
Variable rate	—		%	2.53		%
Total	3.95		%	3.37		%
Coupon/Stated Weighted-average interest rate at end of period:
Fixed rate (3)	3.82		%	3.32		%
Variable rate	—		%	1.96		%
Total	3.82		%	3.23		%
Weighted-average maturity at end of period (in years):
Fixed rate (3)	5.0			6.1
Variable rate	—			1.4
Total	5.0			5.8

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(1)See page 90 for additional information.

(2)See page 89 for additional information.

(3)The 2023 Unsecured Term Loan bears interest at a variable rate of adjusted Term SOFR plus a margin ranging from 75 to 160 basis points based on BPLP’s credit rating. On May 2, 2023, BPLP executed interest rate swaps that effectively fixed Term SOFR for the $1.2 billion outstanding under the 2023 Unsecured Term Loan (see Notes 6 and 7 to the Consolidated Financial Statements). As such, the 2023 Unsecured Term Loan is reflected within Fixed rate statistics.

Unsecured Credit Facility

On June 1, 2023, BPLP amended its 2021 Credit Facility that replaced the LIBOR-based daily floating rate option with a SOFR-based daily floating rate option and to add options for SOFR-based term floating rates and rates for alternative currency loans. In addition, the amendment added a SOFR credit spread adjustment of 0.10%. Other than the foregoing, the material terms of the 2021 Credit Facility remain unchanged.

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The 2021 Credit Facility provides for borrowings of up to $1.5 billion through the Revolving Facility, subject to customary conditions. The 2021 Credit Facility matures on June 15, 2026 and includes 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 June 30, 2023 credit rating, (1) the applicable Daily SOFR, Term SOFR, alternative currency daily rate, and alternative currency term 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 June 30, 2023 and July 28, 2023, BPLP had no borrowings under its Revolving Facility and outstanding letters of credit totaling approximately $6.7 million, with the ability to borrow approximately $1.5 billion.

Unsecured Term Loan

On January 4, 2023, BPLP entered into the 2023 Unsecured Term Loan, which provided for a single borrowing of up to $1.2 billion. Under the credit agreement, BPLP may, at any time prior to the maturity date, increase total commitments by up to an additional $300.0 million in aggregate principal amount by increasing the existing 2023 Unsecured Term Loan or incurring one or more additional term loans, in each case, subject to syndication of the increase and other conditions. The 2023 Unsecured Term Loan matures on May 16, 2024, with one 12-month extension option, subject to customary conditions.

At BPLP’s option, loans under the 2023 Unsecured Term Loan will bear interest at a rate per annum equal to (1) a base rate equal to the greatest of (a) the Federal Funds rate plus 0.5%, (b) the administrative agent’s prime rate, (c) Term SOFR for a one-month period plus 1.00%, and (d) 1.00%, in each case, plus a margin ranging from 0 to 60 basis points based on BPLP’s credit rating; or (2) a rate equal to adjusted Term SOFR with a one-month period plus a margin ranging from 75 to 160 basis points based on BPLP’s credit rating.

On January 4, 2023, upon entry into the credit agreement, BPLP exercised its option to draw $1.2 billion under the 2023 Unsecured Term Loan, a portion of which was used to repay in full the 2022 Unsecured Term Loan, which was scheduled to mature on May 16, 2023. There was no prepayment penalty associated with the repayment of the 2022 Unsecured Term Loan.

As of June 30, 2023, the 2023 Unsecured Term Loan bears interest at a rate equal to adjusted Term SOFR plus 0.85% per annum based on BPLP’s current credit rating at June 30, 2023 (See Note 7 to the Consolidated Financial Statements). At June 30, 2023, BPLP had $1.2 billion outstanding under the 2023 Unsecured Term Loan.

Derivative Instruments and Hedging Activities

On May 2, 2023, BPLP executed interest rate swaps in notional amounts aggregating $1.2 billion. These interest rate swaps were entered into to fix Term SOFR, the reference rate for BPLP’s 2023 Unsecured Term Loan, at a weighted-average rate of 4.6420% for the period commencing on May 4, 2023 and ending on May 16, 2024. Based on BPLP’s credit rating as of June 30, 2023, the interest rate for the 2023 Unsecured Term Loan would be 6.09% (See Note 7 to the Consolidated Financial Statements).

Unsecured Senior Notes

For a description of BPLP’s outstanding unsecured senior notes as of June 30, 2023, see Note 6 to the Consolidated Financial Statements.

On May 15, 2023, BPLP completed a public offering of $750.0 million in aggregate principal amount of its 6.500% unsecured senior notes due 2034. The notes were priced at 99.697% of the principal amount to yield an effective rate (including financing fees) of approximately 6.619% per annum to maturity. The notes will mature on January 15, 2034, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $741.3 million after deducting underwriting discounts and transaction expenses.

The indenture relating to the unsecured senior notes contains certain financial restrictions and requirements, including (1) a leverage ratio not to exceed 60%, (2) a secured debt leverage ratio not to exceed 50%, (3) an interest coverage ratio of greater than 1.50, and (4) an unencumbered asset value of not less than 150% of unsecured debt. At June 30, 2023, BPLP was in compliance with each of these financial restrictions and requirements.

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Mortgage Notes Payable

The following represents the outstanding principal balances due under the mortgage notes payable at June 30, 2023:

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	$	(13,743)	$	2,286,257	$	914,552	(2)(3)(4)	June 9, 2027
601 Lexington Avenue	2.79	%	2.93	%	1,000,000		(11,493)		988,507		444,828		(2)(5)	January 9, 2032
Total					$	3,300,000	$	(25,236)	$	3,274,764	$	1,359,380

_______________ 

(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 June 30, 2023, the maximum funding obligation under the guarantee was approximately $11.2 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 8 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%. Seventeen 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 June 30, 2023, the aggregate carrying amount of debt, including both our and our partners’ share, incurred by these ventures was approximately $4.1 billion (of which our proportionate share is approximately $1.6 billion). The table below summarizes the outstanding debt of these joint venture properties at June 30, 2023. 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. 

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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	%	4.23	%	$	300,000	$	(1,090)	$	298,910	$	164,400	(2)(4)	July 19, 2025
Market Square North	50.00	%	7.56	%	7.74	%	125,000		(539)		124,461		62,230		(2)(3) (5)	November 10, 2025
1265 Main Street	50.00	%	3.77	%	3.84	%	35,127		(236)		34,891		17,446			January 1, 2032
Colorado Center	50.00	%	3.56	%	3.59	%	550,000		(737)		549,263		274,632		(2)	August 9, 2027
Dock 72	50.00	%	7.59	%	7.85	%	198,383		(1,142)		197,241		98,621		(2)(6)	December 18, 2025
The Hub on Causeway - Podium	50.00	%	7.51	%	7.68	%	174,329		(57)		174,272		87,136		(2)(7)	September 6, 2023
Hub50House	50.00	%	4.43	%	4.51	%	185,000		(1,223)		183,777		91,889		(2)(8)	June 17, 2032
100 Causeway Street	50.00	%	6.76	%	6.97	%	337,604		(145)		337,459		168,729		(2)(3) (9)	September 5, 2023
7750 Wisconsin Avenue (Marriott International Headquarters)	50.00	%	6.51	%	6.66	%	251,542		(317)		251,225		125,613		(2)(3) (10)	April 26, 2024
360 Park Avenue South	42.21	%	7.65	%	8.10	%	216,686		(1,456)		215,230		90,849		(2)(3) (11)	December 14, 2024
Safeco Plaza	33.67	%	4.82	%	4.96	%	250,000		(1,077)		248,923		83,812		(2)(12)	September 1, 2026
500 North Capitol Street, NW	30.00	%	6.83	%	7.16	%	105,000		(825)		104,175		31,069		(2)(13)	June 5, 2026
200 Fifth Avenue	26.69	%	4.34	%	5.60	%	600,000		(9,000)		591,000		149,694		(2)(14)	November 24, 2028
901 New York Avenue	25.00	%	3.61	%	3.69	%	209,868		(268)		209,600		52,400			January 5, 2025
3 Hudson Boulevard	25.00	%	8.68	%	8.68	%	80,000		—		80,000		20,000		(2)(3) (15)	August 13, 2023
Metropolitan Square	20.00	%	7.25	%	8.03	%	420,000		(2,527)		417,473		83,495		(2)(3) (16)	April 9, 2024
Reston Next Residential	20.00	%	7.15	%	7.47	%	39,565		(1,284)		38,281		7,656		(2)(3) (17)	May 13, 2026
Total							$	4,078,104	$	(21,923)	$	4,056,181	$	1,609,671

_______________ 

(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 includes certain extension options, subject to certain conditions.

(4)The loan bears interest at a variable rate equal to SOFR plus 1.38% per annum. 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 4.059% per annum through the expiration of the interest rate swap contracts.

(5)The loan bears interest at a variable rate equal to the greater of (1) the sum of (x) SOFR and (y) 2.41% or (2) 2.80% per annum.

(6)The construction financing bears interest at a variable rate equal to (1) the greater of (x) SOFR or (y) 0.25%, plus (2) 2.50% per annum.

(7)The construction financing bears interest at a variable rate equal to SOFR plus 2.35% per annum.

(8)The loan bears interest at a variable rate equal to SOFR plus 1.35% per annum. 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.

(9)The loan bears interest at a variable rate equal to SOFR plus 1.60% per annum. On July 28, 2023 the joint venture extended the loan maturity to September 5, 2024. The loan extension required an approximately $4.0 million principal repayment and the interest rate was reduced from Term SOFR plus 1.60% to Term SOFR plus 1.48% per annum (See Note 14 to the Consolidated Financial Statements).

(10)The construction financing bears interest at a variable rate equal to SOFR plus 1.35% per annum.

(11)The loan bears interest at a variable rate equal to Adjusted Term SOFR plus 2.40% per annum. The spread on the variable rate may be reduced, subject to certain conditions.

(12)The loan bears interest at a variable rate equal to the greater of (x) 2.35% or (y) SOFR plus 2.32% per annum. The joint venture entered into an interest rate cap agreement with a financial institution to limit its exposure to

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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.

(13)The indebtedness consists of (x) a $70.0 million mortgage loan payable (Note A) which bears interest at a fixed rate of 6.23% per annum, and (y) a $35.0 million mortgage loan payable (Note B) which bears interest at a fixed rate of 8.03% per annum. We provided $10.5 million of the Note B mortgage financing to the joint venture. Our portion of the loan has been reflected as Related Party Note Receivable, Net on our Consolidated Balance Sheets.

(14)The loan bears interest at a variable rate equal to LIBOR plus 1.30% per annum through July 9, 2023. For the period commencing on July 10, 2023 the loan will bear interest at a variable rate equal to Term SOFR plus approximately 1.41% per annum. The joint venture entered into interest rate swap contracts with notional amounts aggregating $600.0 million through June 2028, resulting in a fixed rate of approximately 4.34% per annum through the expiration of the interest rate swap contracts. In addition to items noted in footnote one above, the GAAP interest rate includes the adjustment required to reflect the loan at fair value upon acquisition.

(15)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 through July 6, 2023. For the period commencing on July 7, 2023, the loan will bear interest at a variable rate equal to Term SOFR plus 3.61% per annum. The loan has been reflected as Related Party Note Receivable, Net on our Consolidated Balance Sheets. As of June 30, 2023, the loan has approximately $23.2 million of accrued interest due at the maturity date.

(16)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 (y) a $115.0 million mezzanine note payable which bears interest at a variable rate equal to SOFR plus 5.25%. 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.

(17)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.

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 8 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 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

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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 June 30, 2023 and 2022:

	Three months ended June 30,
	2023			2022
	(in thousands)
Net income attributable to Boston Properties, Inc.	$	104,299		$	222,989
Add:
Noncontrolling interest—common units of the Operating Partnership	12,117			25,708
Noncontrolling interests in property partnerships	19,768			18,546
Net income	136,184			267,243
Add:
Depreciation and amortization	202,577			183,146
Noncontrolling interests in property partnerships’ share of depreciation and amortization	(17,858)			(17,414)
BXP’s share of depreciation and amortization from unconsolidated joint ventures	25,756			21,120
Corporate-related depreciation and amortization	(442)			(413)
Less:
Gains on sales of real estate	—			96,247
Unrealized gain on non-real estate investment	124			—
Noncontrolling interests in property partnerships	19,768			18,546
Funds from Operations (FFO) attributable to the Operating Partnership	326,325			338,889
Less:
Noncontrolling interest—common units of the Operating Partnership’s share of funds from operations	33,481			34,329
Funds from Operations attributable to Boston Properties, Inc.	$	292,844		$	304,560
Our percentage share of Funds from Operations—basic	89.74		%	89.87		%
Weighted average shares outstanding—basic	156,826			156,720

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The following tables presents a reconciliation of net income attributable to Boston Properties, Inc. to Diluted FFO attributable to Boston Properties, Inc. for income (numerator) and shares/units (denominator) for the three months ended June 30, 2023 and 2022:

	Three months ended June 30,
	2023		2022
	(in thousands)
Net income attributable to Boston Properties, Inc.	$	104,299	$	222,989
Add:
Noncontrolling interest—common units of the Operating Partnership	12,117		25,708
Noncontrolling interests in property partnerships	19,768		18,546
Net income	136,184		267,243
Add:
Depreciation and amortization	202,577		183,146
Noncontrolling interests in property partnerships’ share of depreciation and amortization	(17,858)		(17,414)
BXP’s share of depreciation and amortization from unconsolidated joint ventures	25,756		21,120
Corporate-related depreciation and amortization	(442)		(413)
Less:
Gains on sales of real estate	—		96,247
Unrealized gain on non-real estate investment	124		—
Noncontrolling interests in property partnerships	19,768		18,546
Funds from Operations (FFO) attributable to the Operating Partnership	326,325		338,889
Effect of Dilutive Securities:
Stock based compensation	—		—
Diluted FFO	326,325		338,889
Less:
Noncontrolling interest—common units of the Operating Partnership’s share of diluted FFO	33,383		34,262
Diluted FFO attributable to Boston Properties, Inc. (1)	$	292,942	$	304,627

___________

(1)BXP’s share of diluted Funds from Operations was 89.77% and 89.89% for the three months ended June 30, 2023 and 2022, respectively.

	Three months ended June 30,
	2023	2022
	shares/units (in thousands)
Basic Funds from Operations	174,748	174,392
Effect of Dilutive Securities:
Stock based compensation	392	472
Diluted Funds from Operations	175,140	174,864
Less:
Noncontrolling interest—common units of the Operating Partnership’s share of diluted Funds from Operations	17,922	17,672
Diluted Funds from Operations attributable to Boston Properties, Inc. (1)	157,218	157,192

 _______________

(1)BXP’s share of diluted Funds from Operations was 89.77% and 89.89% for the three months ended June 30, 2023 and 2022, respectively.

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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 June 30, 2023 and 2022:

	Three months ended June 30,
	2023		2022
	(in thousands)
Net income attributable to Boston Properties Limited Partnership	$	118,098	$	253,788
Add:
Noncontrolling interests in property partnerships	19,768		18,546
Net income	137,866		272,334
Add:
Depreciation and amortization	200,895		181,416
Noncontrolling interests in property partnerships’ share of depreciation and amortization	(17,858)		(17,414)
BXP’s share of depreciation and amortization from unconsolidated joint ventures	25,756		21,120
Corporate-related depreciation and amortization	(442)		(413)
Less:
Gains on sales of real estate	—		99,608
Unrealized gain on non-real estate investment	124		—
Noncontrolling interests in property partnerships	19,768		18,546
Funds from Operations attributable to Boston Properties Limited Partnership (1)	$	326,325	$	338,889
Weighted average shares outstanding—basic	174,748		174,392

 _______________

(1)Our calculation includes OP Units and vested LTIP Units (including vested 2012 OPP Units and vested 2013 - 2020 MYLTIP Units).

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The following tables presents a reconciliation of net income attributable to Boston Properties Limited Partnership to Diluted FFO attributable to Boston Properties Limited Partnership for income (numerator) and shares/units (denominator) for the three months ended June 30, 2023 and 2022:

	Three months ended June 30,
	2023		2022
	(in thousands)
Net income attributable to Boston Properties Limited Partnership	$	118,098	$	253,788
Add:
Noncontrolling interests in property partnerships	19,768		18,546
Net income	137,866		272,334
Add:
Depreciation and amortization	200,895		181,416
Noncontrolling interests in property partnerships’ share of depreciation and amortization	(17,858)		(17,414)
BXP’s share of depreciation and amortization from unconsolidated joint ventures	25,756		21,120
Corporate-related depreciation and amortization	(442)		(413)
Less:
Gains on sales of real estate	—		99,608
Unrealized gain on non-real estate investment	124		—
Noncontrolling interests in property partnerships	19,768		18,546
Funds from Operations attributable to Boston Properties Limited Partnership (1)	326,325		338,889
Effect of Dilutive Securities:
Stock based compensation	—		—
Diluted Funds from Operations attributable to Boston Properties Limited Partnership	$	326,325	$	338,889

_______________

(1)Our calculation includes OP Units and vested LTIP Units (including vested 2012 OPP Units and vested 2013 - 2020 MYLTIP Units).

	Three months ended June 30,
	2023	2022
	shares/units (in thousands)
Basic Funds from Operations	174,748	174,392
Effect of Dilutive Securities:
Stock based compensation	392	472
Diluted Funds from Operations	175,140	174,864

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 June 30, 2023, we paid approximately $80.3 million to fund tenant-related obligations, including tenant improvements and leasing commissions.

In addition, during the three months ended June 30, 2023, we and our unconsolidated joint venture partners incurred approximately $82.8 million of new client-related obligations associated with approximately 890,000 square feet of second generation leases, or approximately $93 per square foot. We signed approximately 47,500 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 second quarter of

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2023, we signed leases for approximately 937,500 square feet of space and incurred aggregate client-related obligations of approximately $90.2 million, or approximately $96 per square foot.

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ITEM 3—Quantitative and Qualitative Disclosures about Market Risk.

We are exposed to certain market risks, one of the most predominant of which is a change in interest rates. Increases in interest rates can result in increased interest expense under our Revolving Facility, 2023 Unsecured Term Loan and other variable rate debt to the extent we do not have interest rate swaps in place to hedge the effect of such rate increases. Increases in interest rates can also result in increased interest expense when our fixed rate debt matures and needs to be refinanced. As of June 30, 2023, approximately $14.3 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. The remaining $1.2 billion of outstanding borrowings bore interest at a variable rate. However, we entered into interest rate swaps, thus fixing the variability of the interest rate (See Note 7 to the Consolidated Financial Statements for information pertaining to interest rate contracts in place as of June 30, 2023 and their respective fair values). Therefore, as of June 30, 2023, we have no outstanding variable rate debt that has not been subject to an interest rate swap.

The table below does not include our unconsolidated joint venture debt. For a discussion concerning our unconsolidated joint venture debt, including interest rate swaps, 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.”

The following table presents our aggregate debt obligations carrying value, estimated fair value and where applicable, the corresponding weighted-average GAAP interest rates sorted by maturity date as of June 30, 2023.

	2023			2024			2025			2026			2027			2028+			Total			Estimated Fair Value
	(dollars in thousands) Mortgage debt, net
Fixed Rate	$	(2,421)		$	(4,843)		$	(4,843)		$	(4,843)		$	2,297,138		$	994,576		$	3,274,764		$	2,765,657
GAAP Average Interest Rate	—		%	—		%	—		%	—		%	3.64		%	2.93		%	3.42		%
Variable Rate	—			—			—			—			—			—			—			—
	Unsecured debt, net
Fixed Rate	$	499,847		$	699,532		$	848,093		$	1,991,832		$	744,231		$	6,201,860		$	10,985,395		$	9,751,688
GAAP Average Interest Rate	3.28		%	3.92		%	3.35		%	3.63		%	6.92		%	3.72		%	3.88		%
Variable Rate	—			1,196,046			—			—			—			—			1,196,046			1,194,895
Total Debt	$	497,426		$	1,890,735		$	843,250		$	1,986,989		$	3,041,369		$	7,196,436		$	15,456,205		$	13,712,240

At June 30, 2023, the weighted-average coupon/stated rates on the fixed rate debt stated above was 3.67% per annum. At June 30, 2023, our outstanding variable rate debt totaled $1.2 billion and all of it was subject to interest rate swaps. At June 30, 2023, the coupon/stated rate on our variable rate debt, including the effect of the interest rate swaps, was approximately 5.592% per annum. If market interest rates on our variable rate debt had been 100 basis points greater, total interest expense would have increased approximately $3.0 million and $6.0 million for the three and six months ended June 30, 2023, respectively.

Our use of derivative instruments also involves certain additional risks such as counterparty credit risk, the enforceability of hedging contracts and the risk that unanticipated and significant changes in interest rates will cause a significant loss of basis in the contract. We believe that there is a low likelihood that these counterparties will fail to meet our obligations and we minimize our exposure by limiting counterparties to major banks who meet established credit and capital guidelines. There can be no assurance that we will adequately protect against the foregoing risks.

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.

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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 second quarter of our fiscal year ending December 31, 2023 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 second quarter of our fiscal year ending December 31, 2023 that has materially affected, or is reasonably likely to materially affect, its internal control over financial reporting.

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PART II. OTHER INFORMATION

ITEM 1—Legal Proceedings.

We are subject to legal proceedings and claims that arise in the ordinary course of business. These matters are generally covered by insurance. Management believes that the final outcome of such matters will not have a material adverse effect on our financial position, results of operations or liquidity.

ITEM 1A—Risk Factors.

Except to the extent 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, 2022.

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. None.

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 June 30, 2023, in connection with issuances of common stock by BXP pursuant to issuances of restricted common stock to non-employee directors and the settlement of deferred stock awards under the Boston Properties, Inc. 2021 Stock Incentive Plan, BPLP issued an aggregate of 7,449 common units to BXP in exchange for approximately $67.80, the aggregate proceeds of such common stock issuances to BXP. Such units were issued in reliance on an exemption from registration under Section 4(a)(2) of the Securities Act of 1933, as amended.

(b)Not Applicable.

(c)Issuer Purchases of Equity Securities.

Period	(a) Total Number of Units Purchased		(b) Average Price Paid per Unit		(c) Total Number of Units Purchased as Part of Publicly Announced Plans or Programs	(d) Maximum Number (or Approximate Dollar Value) of Units that May Yet be Purchased
April 1, 2023 – April 30, 2023	—		$	—	N/A	N/A
May 1, 2023 – May 31, 2023	576	(1)	$	0.25	N/A	N/A
June 1, 2023 – June 30, 2023	11,051	(2)	$	0.25	N/A	N/A
Total	11,627		$	0.25	N/A	N/A

___________

(1)Represents LTIP units that were repurchased in connection with the termination of an employee’s employment with BXP. Under the terms of the applicable LTIP unit vesting agreement, the LTIP units were repurchased at a price of $0.25 per unit, which was the amount originally paid by such employee for such units.

(2)Represents LTIP units and 2020-2022 MYLTIP units that were repurchased in connection with the termination of an employee’s employment with BXP. Under the terms of the applicable LTIP unit vesting agreements and MYLTIP award agreements, the LTIP units and MYLTIP units were repurchased at a price of $0.25 per unit, which was the amount originally paid by such employee for such units.

99

ITEM 3—Defaults Upon Senior Securities.

None.

ITEM 4—Mine Safety Disclosures.

None.

ITEM 5—Other Information.

(a)None.

(b)None.

(c)During the three months ended June 30, 2023, none of our directors or officers (as defined in Rule 16a-1(f) of the Securities Exchange Act of 1934, as amended) adopted, terminated or modified a Rule 10b5-1 trading arrangement or non-Rule 10b5-1 trading arrangement (as such terms are defined in Item 408 of Regulation S-K).

100

ITEM 6—Exhibits.

(a)Exhibits 

4.1	—	Supplemental Indenture No. 25, dated as of May 15, 2023, between Boston Properties Limited Partnership and The Bank of New York Mellon Trust Company, N.A., as Trustee, including a form of the 6.500% Senior Notes due 2034 (Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties, Inc. and Boston Properties Limited Partnership filed on May 15, 2023.)
10.1	—	First Amendment to Ninth Amended and Restated Credit Agreement, dated as of June 1, 2023, among Boston Properties Limited Partnership and the lenders identified therein. (Incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K of Boston Properties, Inc. and Boston Properties Limited Partnership filed on June 6, 2023.)
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.)

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, INC.
August 7, 2023		/s/    MICHAEL R. WALSH
		Michael R. Walsh
		Chief Accounting Officer (duly authorized officer and principal accounting officer)

102

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
August 7, 2023		/s/    MICHAEL R. WALSH
		Michael R. Walsh
		Chief Accounting Officer (duly authorized officer and principal accounting officer)

103

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: August 7, 2023

/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: August 7, 2023

/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: August 7, 2023

/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: August 7, 2023

/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 June 30, 2023 (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: August 7, 2023

/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 June 30, 2023 (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: August 7, 2023

/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 June 30, 2023 (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: August 7, 2023

/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 June 30, 2023 (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: August 7, 2023

/s/    MICHAEL E. LABELLE        

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

XML

Cover - $ / shares	6 Months Ended
	Jun. 30, 2023	Jul. 28, 2023
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2023
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	2023
Document Fiscal Period Focus	Q2
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
Title of 12(b) Security	Common Stock, par value $0.01 per share
Entity Listing, Par Value Per Share	$ 0.01
Trading Symbol	BXP
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
Entity Common Stock, Shares Outstanding		156,864,549
Boston Properties Limited Partnership
Entity Information [Line Items]
Document Type	10-Q
Document Period End Date	Jun. 30, 2023
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	2023
Document Fiscal Period Focus	Q2
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 ($) shares in Thousands, $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,870,107 and $6,789,029 at June 30, 2023 and December 31, 2022, respectively)	$ 25,762,722	$ 25,389,663
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at June 30, 2023 and December 31, 2022, respectively)	237,526	237,510
Right of use assets - operating leases	166,421	167,351
Less: accumulated depreciation (amounts related to VIEs of $(1,434,592) and $(1,381,401) at June 30, 2023 and December 31, 2022, respectively)	(6,568,568)	(6,298,082)
Total real estate	19,598,101	19,496,442
Cash and cash equivalents (amounts related to VIEs of $256,201 and $259,658 at June 30, 2023 and December 31, 2022, respectively)	1,581,575	690,333
Cash held in escrows	46,915	46,479
Investments in securities	33,481	32,277
Tenant and other receivables, net (amounts related to VIEs of $13,921 and $16,521 at June 30, 2023 and December 31, 2022, respectively)	91,968	81,389
Related party note receivable, net	88,834	78,576
Sales-type lease receivable, net	13,250	12,811
Accrued rental income, net (amounts related to VIEs of $382,622 and $367,138 at June 30, 2023 and December 31, 2022, respectively)	1,318,320	1,276,580
Deferred charges, net (amounts related to VIEs of $172,655 and $176,597 at June 30, 2023 and December 31, 2022, respectively)	710,820	733,282
Prepaid expenses and other assets (amounts related to VIEs of $13,534 and $11,647 at June 30, 2023 and December 31, 2022, respectively)	77,457	43,589
Investments in unconsolidated joint ventures	1,780,959	1,715,911
Total assets	25,341,680	24,207,669
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $3,274,764 and $3,272,368 at June 30, 2023 and December 31, 2022, respectively)	3,274,764	3,272,368
Unsecured senior notes, net	10,985,395	10,237,968
Unsecured line of credit	0	0
Unsecured term loan	1,196,046	730,000
Lease liabilities - finance leases (amounts related to VIEs of $20,675 and $20,604 at June 30, 2023 and December 31, 2022, respectively)	251,874	249,335
Lease liabilities - operating leases	204,826	204,686
Accounts payable and accrued expenses (amounts related to VIEs of $57,852 and $29,466 at June 30, 2023 and December 31, 2022, respectively)	434,574	417,545
Dividends and distributions payable	171,465	170,643
Accrued interest payable	111,088	103,774
Other liabilities (amounts related to VIEs of $101,301 and $114,232 at June 30, 2023 and December 31, 2022, respectively)	418,813	450,918
Total liabilities	17,048,845	15,837,237
Redeemable deferred stock units— 108,642 and 97,853 units outstanding at redemption value at June 30, 2023 and December 31, 2022, respectively	$ 6,292	$ 6,613
Excess stock, shares outstanding	0	0
Excess stock, shares issued	0	0
Preferred stock / units, shares / units issued (in shares / units)	0	0
Preferred stock / units, shares / units outstanding (in shares / units)	0	0
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, 156,932,300 and 156,836,767 issued and 156,853,400 and 156,757,867 outstanding at June 30, 2023 and December 31, 2022, respectively	1,569	1,568
Additional paid-in capital	6,561,161	6,539,147
Dividends in excess of earnings	(516,550)	(391,356)
Treasury common stock at cost, 78,900 shares at June 30, 2023 and December 31, 2022	(2,722)	(2,722)
Accumulated other comprehensive loss	(3,406)	(13,718)
Total stockholders' equity attributable to Boston Properties, Inc.	6,040,052	6,132,919
Noncontrolling interests:
Common units of the Operating Partnership	689,123	683,583
Property partnerships	1,557,368	1,547,317
Total equity / capital	8,286,543	8,363,819
Total liabilities and equity / capital	25,341,680	24,207,669
Boston Properties Limited Partnership
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,870,107 and $6,789,029 at June 30, 2023 and December 31, 2022, respectively)	25,396,457	25,022,149
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at June 30, 2023 and December 31, 2022, respectively)	237,526	237,510
Right of use assets - operating leases	166,421	167,351
Less: accumulated depreciation (amounts related to VIEs of $(1,434,592) and $(1,381,401) at June 30, 2023 and December 31, 2022, respectively)	(6,448,665)	(6,180,474)
Total real estate	19,351,739	19,246,536
Cash and cash equivalents (amounts related to VIEs of $256,201 and $259,658 at June 30, 2023 and December 31, 2022, respectively)	1,581,575	690,333
Cash held in escrows	46,915	46,479
Investments in securities	33,481	32,277
Tenant and other receivables, net (amounts related to VIEs of $13,921 and $16,521 at June 30, 2023 and December 31, 2022, respectively)	91,968	81,389
Related party note receivable, net	88,834	78,576
Sales-type lease receivable, net	13,250	12,811
Accrued rental income, net (amounts related to VIEs of $382,622 and $367,138 at June 30, 2023 and December 31, 2022, respectively)	1,318,320	1,276,580
Deferred charges, net (amounts related to VIEs of $172,655 and $176,597 at June 30, 2023 and December 31, 2022, respectively)	710,820	733,282
Prepaid expenses and other assets (amounts related to VIEs of $13,534 and $11,647 at June 30, 2023 and December 31, 2022, respectively)	77,457	43,589
Investments in unconsolidated joint ventures	1,780,959	1,715,911
Total assets	25,095,318	23,957,763
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $3,274,764 and $3,272,368 at June 30, 2023 and December 31, 2022, respectively)	3,274,764	3,272,368
Unsecured senior notes, net	10,985,395	10,237,968
Unsecured line of credit	0	0
Unsecured term loan	1,196,046	730,000
Lease liabilities - finance leases (amounts related to VIEs of $20,675 and $20,604 at June 30, 2023 and December 31, 2022, respectively)	251,874	249,335
Lease liabilities - operating leases	204,826	204,686
Accounts payable and accrued expenses (amounts related to VIEs of $57,852 and $29,466 at June 30, 2023 and December 31, 2022, respectively)	434,574	417,545
Dividends and distributions payable	171,465	170,643
Accrued interest payable	111,088	103,774
Other liabilities (amounts related to VIEs of $101,301 and $114,232 at June 30, 2023 and December 31, 2022, respectively)	418,813	450,918
Total liabilities	17,048,845	15,837,237
Redeemable deferred stock units— 108,642 and 97,853 units outstanding at redemption value at June 30, 2023 and December 31, 2022, respectively	6,292	6,613
Noncontrolling interest:
Redeemable partnership units— 16,522,540 and 16,531,172 common units and 2,135,852 and 1,679,175 long term incentive units outstanding at redemption value at June 30, 2023 and December 31, 2022, respectively	1,135,053	1,280,886
Equity / Capital:
Boston Properties Limited Partnership partners’ capital— 1,755,118 and 1,749,682 general partner units and 155,098,282 and 155,008,185 limited partner units outstanding at June 30, 2023 and December 31, 2022, respectively	5,351,166	5,299,428
Accumulated other comprehensive loss	(3,406)	(13,718)
Total partners’ capital	5,347,760	5,285,710
Noncontrolling interests in property partnerships	1,557,368	1,547,317
Noncontrolling interests:
Total equity / capital	6,905,128	6,833,027
Total liabilities and equity / capital	$ 25,095,318	$ 23,957,763

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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,870,107 and $6,789,029 at June 30, 2023 and December 31, 2022, respectively)	$ 25,762,722	$ 25,389,663
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at June 30, 2023 and December 31, 2022, respectively)	237,526	237,510
Less: accumulated depreciation (amounts related to VIEs of $(1,434,592) and $(1,381,401) at June 30, 2023 and December 31, 2022, respectively)	(6,568,568)	(6,298,082)
Cash and cash equivalents (amounts related to VIEs of $256,201 and $259,658 at June 30, 2023 and December 31, 2022, respectively)	1,581,575	690,333
Tenant and other receivables, net (amounts related to VIEs of $13,921 and $16,521 at June 30, 2023 and December 31, 2022, respectively)	91,968	81,389
Accrued rental income, net (amounts related to VIEs of $382,622 and $367,138 at June 30, 2023 and December 31, 2022, respectively)	1,318,320	1,276,580
Deferred charges, net (amounts related to VIEs of $172,655 and $176,597 at June 30, 2023 and December 31, 2022, respectively)	710,820	733,282
Prepaid expenses and other assets (amounts related to VIEs of $13,534 and $11,647 at June 30, 2023 and December 31, 2022, respectively)	77,457	43,589
Mortgage notes payable, net (amounts related to VIEs of $3,274,764 and $3,272,368 at June 30, 2023 and December 31, 2022, respectively)	3,274,764	3,272,368
Lease liabilities - finance leases (amounts related to VIEs of $20,675 and $20,604 at June 30, 2023 and December 31, 2022, respectively)	251,874	249,335
Accounts payable and accrued expenses (amounts related to VIEs of $57,852 and $29,466 at June 30, 2023 and December 31, 2022, respectively)	434,574	417,545
Other liabilities (amounts related to VIEs of $101,301 and $114,232 at June 30, 2023 and December 31, 2022, respectively)	$ 418,813	$ 450,918
Reedemable deferred stock units, units	108,642	97,853
Limited Partners' Capital Account, Units Outstanding (in units)	155,098,282
General Partners' Capital Account, Units Outstanding (in units)	1,755,118
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
Preferred stock / units, shares / units issued (in shares / units)	0	0
Preferred stock / units, shares / units outstanding (in shares / units)	0	0
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	156,932,300	156,836,767
Common Stock, Shares, Outstanding	156,853,400	156,757,867
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 $6,870,107 and $6,789,029 at June 30, 2023 and December 31, 2022, respectively)	$ 25,396,457	$ 25,022,149
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at June 30, 2023 and December 31, 2022, respectively)	237,526	237,510
Less: accumulated depreciation (amounts related to VIEs of $(1,434,592) and $(1,381,401) at June 30, 2023 and December 31, 2022, respectively)	(6,448,665)	(6,180,474)
Cash and cash equivalents (amounts related to VIEs of $256,201 and $259,658 at June 30, 2023 and December 31, 2022, respectively)	1,581,575	690,333
Tenant and other receivables, net (amounts related to VIEs of $13,921 and $16,521 at June 30, 2023 and December 31, 2022, respectively)	91,968	81,389
Accrued rental income, net (amounts related to VIEs of $382,622 and $367,138 at June 30, 2023 and December 31, 2022, respectively)	1,318,320	1,276,580
Deferred charges, net (amounts related to VIEs of $172,655 and $176,597 at June 30, 2023 and December 31, 2022, respectively)	710,820	733,282
Prepaid expenses and other assets (amounts related to VIEs of $13,534 and $11,647 at June 30, 2023 and December 31, 2022, respectively)	77,457	43,589
Mortgage notes payable, net (amounts related to VIEs of $3,274,764 and $3,272,368 at June 30, 2023 and December 31, 2022, respectively)	3,274,764	3,272,368
Lease liabilities - finance leases (amounts related to VIEs of $20,675 and $20,604 at June 30, 2023 and December 31, 2022, respectively)	251,874	249,335
Accounts payable and accrued expenses (amounts related to VIEs of $57,852 and $29,466 at June 30, 2023 and December 31, 2022, respectively)	434,574	417,545
Other liabilities (amounts related to VIEs of $101,301 and $114,232 at June 30, 2023 and December 31, 2022, respectively)	$ 418,813	$ 450,918
Reedemable deferred stock units, units	108,642	97,853
Limited Partners' Capital Account, Units Outstanding (in units)	155,098,282	155,008,185
General Partners' Capital Account, Units Outstanding (in units)	1,755,118	1,749,682
NonControlling Interest Redeemable Partnership Units Common Units Shares Outstanding	16,522,540	16,531,172
NonControlling Interest Redeemable Partnership Units Common Units Long Term Incentive Units At Redemption Value Shares Outstanding	2,135,852	1,679,175
Variable Interest Entity, Primary Beneficiary [Member]
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,870,107 and $6,789,029 at June 30, 2023 and December 31, 2022, respectively)	$ 6,870,107	$ 6,789,029
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at June 30, 2023 and December 31, 2022, respectively)	21,000	21,000
Less: accumulated depreciation (amounts related to VIEs of $(1,434,592) and $(1,381,401) at June 30, 2023 and December 31, 2022, respectively)	(1,434,592)	(1,381,401)
Cash and cash equivalents (amounts related to VIEs of $256,201 and $259,658 at June 30, 2023 and December 31, 2022, respectively)	256,201	259,658
Tenant and other receivables, net (amounts related to VIEs of $13,921 and $16,521 at June 30, 2023 and December 31, 2022, respectively)	13,921	16,521
Accrued rental income, net (amounts related to VIEs of $382,622 and $367,138 at June 30, 2023 and December 31, 2022, respectively)	382,622	367,138
Deferred charges, net (amounts related to VIEs of $172,655 and $176,597 at June 30, 2023 and December 31, 2022, respectively)	172,655	176,597
Prepaid expenses and other assets (amounts related to VIEs of $13,534 and $11,647 at June 30, 2023 and December 31, 2022, respectively)	13,534	11,647
Mortgage notes payable, net (amounts related to VIEs of $3,274,764 and $3,272,368 at June 30, 2023 and December 31, 2022, respectively)	3,274,764	3,272,368
Lease liabilities - finance leases (amounts related to VIEs of $20,675 and $20,604 at June 30, 2023 and December 31, 2022, respectively)	20,675	20,604
Accounts payable and accrued expenses (amounts related to VIEs of $57,852 and $29,466 at June 30, 2023 and December 31, 2022, respectively)	57,852	29,466
Other liabilities (amounts related to VIEs of $101,301 and $114,232 at June 30, 2023 and December 31, 2022, respectively)	101,301	114,232
Variable Interest Entity, Primary Beneficiary [Member] | Boston Properties Limited Partnership
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,870,107 and $6,789,029 at June 30, 2023 and December 31, 2022, respectively)	6,870,107	6,789,029
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at June 30, 2023 and December 31, 2022, respectively)	21,000	21,000
Less: accumulated depreciation (amounts related to VIEs of $(1,434,592) and $(1,381,401) at June 30, 2023 and December 31, 2022, respectively)	(1,434,592)	(1,381,401)
Cash and cash equivalents (amounts related to VIEs of $256,201 and $259,658 at June 30, 2023 and December 31, 2022, respectively)	256,201	259,658
Tenant and other receivables, net (amounts related to VIEs of $13,921 and $16,521 at June 30, 2023 and December 31, 2022, respectively)	13,921	16,521
Accrued rental income, net (amounts related to VIEs of $382,622 and $367,138 at June 30, 2023 and December 31, 2022, respectively)	382,622	367,138
Deferred charges, net (amounts related to VIEs of $172,655 and $176,597 at June 30, 2023 and December 31, 2022, respectively)	172,655	176,597
Prepaid expenses and other assets (amounts related to VIEs of $13,534 and $11,647 at June 30, 2023 and December 31, 2022, respectively)	13,534	11,647
Mortgage notes payable, net (amounts related to VIEs of $3,274,764 and $3,272,368 at June 30, 2023 and December 31, 2022, respectively)	3,274,764	3,272,368
Lease liabilities - finance leases (amounts related to VIEs of $20,675 and $20,604 at June 30, 2023 and December 31, 2022, respectively)	20,675	20,604
Accounts payable and accrued expenses (amounts related to VIEs of $57,852 and $29,466 at June 30, 2023 and December 31, 2022, respectively)	57,852	29,466
Other liabilities (amounts related to VIEs of $101,301 and $114,232 at June 30, 2023 and December 31, 2022, respectively)	$ 101,301	$ 114,232

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Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023		Jun. 30, 2022		Jun. 30, 2023		Jun. 30, 2022
Revenue
Lease	$ 761,733		$ 721,899		$ 1,518,608		$ 1,440,019
Total revenue	817,153		773,927		1,620,353		1,528,234
Expenses
Rental	291,036		273,848		582,344		544,103
General and administrative	44,175		34,665		99,977		77,859
Transaction costs	308		496		1,219		496
Depreciation and amortization	202,577		183,146		411,311		360,770
Total expenses	550,866		501,838		1,119,527		1,001,816
Other income (expense)
income (loss() from unconsolidated joint ventures	(6,668)		(54)		(14,237)		2,135
Gains on sales of real estate	0		96,247		0		118,948
Interest and other income (loss)	17,343		1,195		28,284		2,423
Other Income - assignment fee	0		6,624		0		6,624
Gain (Loss) on Investments	1,571		(4,716)		3,236		(6,978)
Unrealized gain on non-real estate investment	124		0		383		0
Interest expense	(142,473)		(104,142)		(276,680)		(205,370)
Net income	136,184		267,243		241,812		444,200
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnerships	(19,768)		(18,546)		(38,428)		(36,095)
Noncontrolling interest - common units of the Operating Partnership	(12,117)		(25,708)		(21,169)		(42,061)
Net income attributable to the Company	104,299		222,989		182,215		366,044
Net income attributable to the Company	$ 104,299		$ 222,989		$ 182,215		$ 366,044
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)	$ 0.67		$ 1.42		$ 1.16		$ 2.33
Weighted average number of common shares / units outstanding (in shares / units)	156,826		156,720		156,815		156,685
Diluted earnings per common share / unit attributable to the Company
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit)	$ 0.66		$ 1.42		$ 1.16		$ 2.33
Weighted average number of common and common equivalent shares / units outstanding (in shares / units)	157,218		157,192		157,131		157,098
Boston Properties Limited Partnership
Revenue
Lease	$ 761,733		$ 721,899		$ 1,518,608		$ 1,440,019
Total revenue	817,153		773,927		1,620,353		1,528,234
Expenses
Rental	291,036		273,848		582,344		544,103
General and administrative	44,175		34,665		99,977		77,859
Transaction costs	308		496		1,219		496
Depreciation and amortization	200,895		181,416		407,767		357,302
Total expenses	549,184		500,108		1,115,983		998,348
Other income (expense)
income (loss() from unconsolidated joint ventures	(6,668)		(54)		(14,237)		2,135
Gains on sales of real estate	0		99,608		0		122,992
Interest and other income (loss)	17,343		1,195		28,284		2,423
Other Income - assignment fee	0		6,624		0		6,624
Gain (Loss) on Investments	1,571		(4,716)		3,236		(6,978)
Unrealized gain on non-real estate investment	124		0		383		0
Interest expense	(142,473)		(104,142)		(276,680)		(205,370)
Net income	137,866		272,334		245,356		451,712
Net income attributable to noncontrolling interests
Noncontrolling interests in property partnerships	(19,768)		(18,546)		(38,428)		(36,095)
Net income attributable to the Company	118,098		253,788		206,928		415,617
Net income attributable to the Company	$ 118,098		$ 253,788		$ 206,928		$ 415,617
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)	$ 0.68		$ 1.45		$ 1.18		$ 2.38
Weighted average number of common shares / units outstanding (in shares / units)	174,748		174,392		174,693		174,323
Diluted earnings per common share / unit attributable to the Company
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit)	$ 0.67		$ 1.45		$ 1.18		$ 2.38
Weighted average number of common and common equivalent shares / units outstanding (in shares / units)	175,140		174,864		175,009		174,736
Parking and Other [Member]
Revenue
Other revenue	$ 26,984		$ 30,346		$ 50,993		$ 52,080
Parking and Other [Member] | Boston Properties Limited Partnership
Revenue
Other revenue	26,984		30,346		50,993		52,080
Hotel [Member]
Revenue
Other revenue	13,969	[1]	12,089	[1]	22,070	[2]	16,646	[2]
Expenses
Operating expense	8,161		6,444		14,832		11,284
Hotel [Member] | Boston Properties Limited Partnership
Revenue
Other revenue	13,969		12,089		22,070		16,646
Expenses
Operating expense	8,161		6,444		14,832		11,284
Real Estate, Other [Member]
Revenue
Other revenue	4,609		3,239		9,844		7,304
Expenses
Operating expense	4,609		3,239		9,844		7,304
Real Estate, Other [Member] | Boston Properties Limited Partnership
Revenue
Other revenue	4,609		3,239		9,844		7,304
Expenses
Operating expense	4,609		3,239		9,844		7,304
Management Service [Member]
Revenue
Other revenue	9,858		6,354		18,838		12,185
Management Service [Member] | Boston Properties Limited Partnership
Revenue
Other revenue	$ 9,858		$ 6,354		$ 18,838		$ 12,185

[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.

[2] Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.

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Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net income		$ 136,184	$ 267,243	$ 241,812	$ 444,200
Other comprehensive income :
Effective portion of interest rate contracts		14,965	35	8,427	7,600
Amortization of interest rate contracts	[1]	1,674	1,677	3,349	3,353
Other comprehensive income		16,639	1,712	11,776	10,953
Comprehensive Income		152,823	268,955	253,588	455,153
Net income attributable to noncontrolling interests		(31,885)	(44,254)	(59,597)	(78,156)
Other comprehensive income attributable to noncontrolling interests		(1,831)	(304)	(1,463)	(1,368)
Comprehensive income attributable to the Company		119,107	224,397	192,528	375,629
Boston Properties Limited Partnership
Net income		137,866	272,334	245,356	451,712
Other comprehensive income :
Effective portion of interest rate contracts		14,965	35	8,427	7,600
Amortization of interest rate contracts	[2]	1,674	1,677	3,349	3,353
Other comprehensive income		16,639	1,712	11,776	10,953
Comprehensive Income		154,505	274,046	257,132	462,665
Net income attributable to noncontrolling interests		(19,912)	(18,690)	(38,716)	(36,383)
Comprehensive income attributable to the Company		$ 134,593	$ 255,356	$ 218,416	$ 426,282

[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.

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Consolidated Statements Of Equity - USD ($) $ in Thousands	Total	Common 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, 2021		156,545,000
Equity, value at Dec. 31, 2021	$ 8,033,228	$ 1,565	$ 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		152,000
Redemption of operating partnership units to common stock, value	0	$ 2	5,427				(5,429)
Allocated net income for the period	444,200			366,044			42,061	36,095
Dividends declared	(343,028)			(307,169)			(35,859)
Shares issued pursuant to stock purchase plan, shares		5,000
Shares issued pursuant to stock purchase plan, value	600		600
Net activity from stock option and incentive plan, shares		24,000
Net activity from stock option and incentive plan, value	36,946		4,287				32,659
Contributions from noncontrolling interests in property partnerships	849							849
Distributions to noncontrolling interests in property partnerships	(41,079)							(41,079)
Effective portion of interest rate contracts	7,600					6,831	769
Amortization of interest rate contracts	3,353					2,754	311	288
Reallocation of noncontrolling interest	0		16,953				(16,953)
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
Equity, shares at Mar. 31, 2022		156,712,000
Equity, value at Mar. 31, 2022	8,041,659	$ 1,567	6,509,663	(636,421)	(2,722)	(28,485)	649,602	1,548,455
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemption of operating partnership units to common stock, shares		11,000
Redemption of operating partnership units to common stock, value	0	$ 0	401				(401)
Allocated net income for the period	267,243			222,997			25,700	18,546
Dividends declared	(171,531)			(153,592)			(17,939)
Net activity from stock option and incentive plan, shares		3,000
Net activity from stock option and incentive plan, value	18,025		4,420				13,605
Distributions to noncontrolling interests in property partnerships	(14,439)							(14,439)
Effective portion of interest rate contracts	35					31	4
Amortization of interest rate contracts	1,677					1,377	156	144
Reallocation of noncontrolling interest	0		10,513				(10,513)
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
Equity, shares at Dec. 31, 2022	156,757,867	156,758,000
Equity, value at Dec. 31, 2022	$ 8,363,819	$ 1,568	6,539,147	(391,356)	(2,722)	(13,718)	683,583	1,547,317
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemption of operating partnership units to common stock, shares		21,000
Redemption of operating partnership units to common stock, value	0	$ 1	793				(794)
Allocated net income for the period	241,812			182,215			21,169	38,428
Dividends declared	(344,146)			(307,409)			(36,737)
Shares issued pursuant to stock purchase plan, shares		9,000
Shares issued pursuant to stock purchase plan, value	586		586
Net activity from stock option and incentive plan, shares		66,000
Net activity from stock option and incentive plan, value	41,361		3,338				38,023
Contributions from noncontrolling interests in property partnerships	7,555							7,555
Distributions to noncontrolling interests in property partnerships	(36,220)							(36,220)
Effective portion of interest rate contracts	8,427					7,565	862
Amortization of interest rate contracts	3,349					2,747	314	288
Reallocation of noncontrolling interest	$ 0		17,297				(17,297)
Equity, shares at Jun. 30, 2023	156,853,400	156,854,000
Equity, value at Jun. 30, 2023	$ 8,286,543	$ 1,569	6,561,161	(516,550)	(2,722)	(3,406)	689,123	1,557,368
Equity, shares at Mar. 31, 2023		156,830,000
Equity, value at Mar. 31, 2023	8,306,484	$ 1,568	6,549,314	(467,159)	(2,722)	(18,214)	691,627	1,552,070
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemption of operating partnership units to common stock, shares		16,000
Redemption of operating partnership units to common stock, value	0	$ 1	598				(599)
Allocated net income for the period	136,184			104,325			12,091	19,768
Dividends declared	(172,092)			(153,716)			(18,376)
Net activity from stock option and incentive plan, shares		8,000
Net activity from stock option and incentive plan, value	13,942		(110)				14,052
Distributions to noncontrolling interests in property partnerships	(14,614)							(14,614)
Effective portion of interest rate contracts	14,965					13,435	1,530
Amortization of interest rate contracts	1,674					1,373	157	144
Reallocation of noncontrolling interest	$ 0		11,359				(11,359)
Equity, shares at Jun. 30, 2023	156,853,400	156,854,000
Equity, value at Jun. 30, 2023	$ 8,286,543	$ 1,569	$ 6,561,161	$ (516,550)	$ (2,722)	$ (3,406)	$ 689,123	$ 1,557,368

XML

Consolidated Statement of Capital and Noncontrolling Interests - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Common Stock, Shares, Outstanding	156,853,400		156,853,400			156,757,867
Net activity from stock option and incentive plan, value	$ 13,942	$ 18,025	$ 41,361	$ 36,946
Effective portion of interest rate contracts	14,965	35	8,427	7,600
Amortization of interest rate contracts	1,674	1,677	3,349	3,353
Contributions from noncontrolling interests in property partnerships			7,555	849
Distributions to noncontrolling interests in property partnerships	$ (14,614)	$ (14,439)	$ (36,220)	$ (41,079)
General Partner [Member]
Common Stock, Shares, Outstanding	1,755,000	1,750,000	1,755,000	1,750,000	1,755,000	1,750,000	1,749,000	1,746,000
Net activity from contributions and unearned compensation	0	1,000	5,000	1,000
Conversion of redeemable partnership units			0	3,000
Limited Partner [Member]
Common Stock, Shares, Outstanding	155,098,000	154,977,000	155,098,000	154,977,000	155,075,000	155,008,000	154,962,000	154,799,000
Net activity from contributions and unearned compensation	7,000	4,000	69,000	29,000
Conversion of redeemable partnership units	16,000	11,000	21,000	149,000
Partners' Capital (General and Limited Partners)[Member]
Beginning Balance	$ 5,351,166	$ 4,716,430	$ 5,351,166	$ 4,716,430	$ 5,449,936	$ 5,299,428	$ 3,914,832	$ 4,173,290
Net activity from contributions and unearned compensation, value	(110)	4,418	3,922	4,885
Allocated net income for the period	106,007	228,088	185,759	373,556
Distributions	(153,716)	(153,592)	(307,409)	(307,169)
Conversion of redeemable partnership units, value	599	401	794	5,429
Adjustment to reflect redeemable partnership units at redemption value	(51,550)	722,283	168,672	466,439
Accumulated Other Comprehensive Loss [Member]
Beginning Balance	(3,406)	(27,077)	(3,406)	(27,077)	(18,214)	(13,718)	(28,485)	(36,662)
Effective portion of interest rate contracts	13,435	31	7,565	6,831
Amortization of interest rate contracts	1,373	1,377	2,747	2,754
Noncontrolling interest - property partnerships [Member]
Beginning Balance	1,557,368	1,552,706	1,557,368	1,552,706	1,552,070	1,547,317	1,548,455	1,556,553
Allocated net income for the period	19,768	18,546	38,428	36,095
Amortization of interest rate contracts	144	144	288	288
Contributions from noncontrolling interests in property partnerships			7,555	849
Distributions to noncontrolling interests in property partnerships	(14,614)	(14,439)	(36,220)	(41,079)
Total Capital [Member]
Beginning Balance	6,905,128	6,242,059	6,905,128	6,242,059	6,983,792	6,833,027	5,434,802	5,693,181
Net activity from contributions and unearned compensation, value	(110)	4,418	3,922	4,885
Allocated net income for the period	125,775	246,634	224,187	409,651
Distributions	(153,716)	(153,592)	(307,409)	(307,169)
Conversion of redeemable partnership units, value	599	401	794	5,429
Adjustment to reflect redeemable partnership units at redemption value	(51,550)	722,283	168,672	466,439
Effective portion of interest rate contracts	13,435	31	7,565	6,831
Amortization of interest rate contracts	1,517	1,521	3,035	3,042
Contributions from noncontrolling interests in property partnerships			7,555	849
Distributions to noncontrolling interests in property partnerships	(14,614)	(14,439)	(36,220)	(41,079)
Noncontrolling interest - Redeemable partnership units [Member]
Beginning Balance	1,135,053	1,646,678	1,135,053	1,646,678	$ 1,074,648	$ 1,280,886	$ 2,347,834	$ 2,078,603
Net activity from contributions and unearned compensation, value	14,052	13,607	38,025	32,661
Allocated net income for the period	12,091	25,700	21,169	42,061
Distributions	(18,376)	(17,939)	(36,737)	(35,859)
Conversion of redeemable partnership units, value	(599)	(401)	(794)	(5,429)
Adjustment to reflect redeemable partnership units at redemption value	51,550	(722,283)	(168,672)	(466,439)
Effective portion of interest rate contracts	1,530	4	862	769
Amortization of interest rate contracts	$ 157	$ 156	$ 314	$ 311

XML

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Net income	$ 241,812	$ 444,200
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	411,311	360,770
Amortization of right of use assets - operating leases	929	1,407
Non-cash compensation expense	41,524	36,195
Loss (income) from unconsolidated joint ventures	14,237	(2,135)
Distributions of net cash flow from operations of unconsolidated joint ventures	11,437	10,097
Losses (gains) from investments in securities	(3,236)	6,978
Allowance for current expected credit losses	264	(458)
Non-cash portion of interest expense	14,940	12,528
Other Income - assignment fee	0	(6,624)
Gains on sales of real estate	0	(118,948)
Unrealized gain on non-real estate investment	(383)	0
Change in assets and liabilities:
Tenant and other receivables, net	3,721	10,167
Notes receivable, net	0	(152)
Accrued rental income, net	(42,965)	(48,901)
Prepaid expenses and other assets	(24,758)	6,326
Lease liabilities - operating leases	140	82
Accounts payable and accrued expenses	6,320	(18,636)
Accrued interest payable	7,314	2,036
Other liabilities	(21,773)	(37,732)
Tenant leasing costs	(47,651)	(40,561)
Total adjustments	371,371	172,439
Net cash provided by operating activities	613,183	616,639
Cash flows from investing activities:
Acquisitions of real estate	0	(727,835)
Construction in progress	(235,331)	(237,182)
Building and other capital improvements	(78,344)	(63,278)
Tenant improvements	(135,743)	(97,844)
Proceeds from sales of real estate	0	157,345
Proceeds from assignment fee	0	6,624
Capital contributions to unconsolidated joint ventures	(103,595)	(69,819)
Capital distributions from unconsolidated joint ventures	7,350	36,622
Investment in non-real estate investments	(733)	0
Issuance of related party note receivable	(10,500)	0
Proceeds from note receivable	0	10,000
Investments in securities, net	2,032	5,197
Net cash used in investing activities	(554,864)	(980,170)
Cash flows from financing activities:
Proceeds from unsecured senior notes	747,727	0
Borrowings on unsecured line of credit	0	340,000
Repayments of unsecured line of credit	0	(320,000)
Borrowings on unsecured term loan	1,200,000	730,000
Repayment of unsecured term loan	(730,000)	0
Deferred financing costs	(12,339)	(2,230)
Net activity from equity transactions	(39)	(366)
Dividends and distributions	(343,325)	(341,951)
Contributions from noncontrolling interests in property partnerships	7,555	849
Distributions to noncontrolling interests in property partnerships	(36,220)	(41,079)
Net cash provided by financing activities	833,359	365,223
Net increase (decrease) in cash and cash equivalents and cash held in escrows	891,678	1,692
Cash and cash equivalents and cash held in escrows, beginning of period	736,812	501,158
Cash and cash equivalents and cash held in escrows, end of period	1,628,490	502,850
Reconciliation of cash and cash equivalents and cash held in escrow
Cash and cash equivalents, beginning of period	690,333	452,692
Cash held in escrows, beginning of period	46,479	48,466
Cash and cash equivalents, end of period	1,581,575	456,491
Cash held in escrows,end of period	46,915	46,359
Supplemental disclosures:
Cash paid for interest	273,214	216,409
Interest capitalized	21,153	27,819
Non-cash investing and financing activities:
Write-off of fully depreciated real estate	(85,878)	(65,435)
Change in real estate included in accounts payable and accrued expenses	25,562	40,655
Construction in progress, net deconsolidated	0	(11,316)
Investment in unconsolidated joint ventures recorded upon deconsolidation	0	11,316
Dividends and distributions declared but not paid	171,465	170,937
Conversions of noncontrolling interests to stockholders’ equity	794	5,429
Issuance of restricted securities to employees and non-employee directors	47,885	47,198
Boston Properties Limited Partnership
Net income	245,356	451,712
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	407,767	357,302
Amortization of right of use assets - operating leases	929	1,407
Non-cash compensation expense	41,524	36,195
Loss (income) from unconsolidated joint ventures	14,237	(2,135)
Distributions of net cash flow from operations of unconsolidated joint ventures	11,437	10,097
Losses (gains) from investments in securities	(3,236)	6,978
Allowance for current expected credit losses	264	(458)
Non-cash portion of interest expense	14,940	12,528
Other Income - assignment fee	0	(6,624)
Gains on sales of real estate	0	(122,992)
Unrealized gain on non-real estate investment	(383)	0
Change in assets and liabilities:
Tenant and other receivables, net	3,721	10,167
Notes receivable, net	0	(152)
Accrued rental income, net	(42,965)	(48,901)
Prepaid expenses and other assets	(24,758)	6,326
Lease liabilities - operating leases	140	82
Accounts payable and accrued expenses	6,320	(18,636)
Accrued interest payable	7,314	2,036
Other liabilities	(21,773)	(37,732)
Tenant leasing costs	(47,651)	(40,561)
Total adjustments	367,827	164,927
Net cash provided by operating activities	613,183	616,639
Cash flows from investing activities:
Acquisitions of real estate	0	(727,835)
Construction in progress	(235,331)	(237,182)
Building and other capital improvements	(78,344)	(63,278)
Tenant improvements	(135,743)	(97,844)
Proceeds from sales of real estate	0	157,345
Proceeds from assignment fee	0	6,624
Capital contributions to unconsolidated joint ventures	(103,595)	(69,819)
Capital distributions from unconsolidated joint ventures	7,350	36,622
Investment in non-real estate investments	(733)	0
Issuance of related party note receivable	(10,500)	0
Proceeds from note receivable	0	10,000
Investments in securities, net	2,032	5,197
Net cash used in investing activities	(554,864)	(980,170)
Cash flows from financing activities:
Proceeds from unsecured senior notes	747,727	0
Borrowings on unsecured line of credit	0	340,000
Repayments of unsecured line of credit	0	(320,000)
Borrowings on unsecured term loan	1,200,000	730,000
Repayment of unsecured term loan	(730,000)	0
Deferred financing costs	(12,339)	(2,230)
Net activity from equity transactions	(39)	(366)
Dividends and distributions	(343,325)	(341,951)
Contributions from noncontrolling interests in property partnerships	7,555	849
Distributions to noncontrolling interests in property partnerships	(36,220)	(41,079)
Net cash provided by financing activities	833,359	365,223
Net increase (decrease) in cash and cash equivalents and cash held in escrows	891,678	1,692
Cash and cash equivalents and cash held in escrows, beginning of period	736,812	501,158
Cash and cash equivalents and cash held in escrows, end of period	1,628,490	502,850
Reconciliation of cash and cash equivalents and cash held in escrow
Cash and cash equivalents, beginning of period	690,333	452,692
Cash held in escrows, beginning of period	46,479	48,466
Cash and cash equivalents, end of period	1,581,575	456,491
Cash held in escrows,end of period	46,915	46,359
Supplemental disclosures:
Cash paid for interest	273,214	216,409
Interest capitalized	21,153	27,819
Non-cash investing and financing activities:
Write-off of fully depreciated real estate	(84,629)	(65,435)
Change in real estate included in accounts payable and accrued expenses	25,562	40,655
Construction in progress, net deconsolidated	0	(11,316)
Investment in unconsolidated joint ventures recorded upon deconsolidation	0	11,316
Dividends and distributions declared but not paid	171,465	170,937
Conversions of noncontrolling interests to stockholders’ equity	794	5,429
Issuance of restricted securities to employees and non-employee directors	$ 47,885	$ 47,198

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Organization

6 Months Ended

Jun. 30, 2023

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 June 30, 2023 owned an approximate 89.4% (89.6% at December 31, 2022) 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 - 2023 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 - 2020 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 2021 - 2023 MYLTIP Units differ from other LTIP Units granted to employees (including the 2012 OPP Units and the 2013 - 2020 MYLTIP Units, which have been earned). Therefore, unless specifically noted otherwise, all references to LTIP Units exclude the 2021 - 2023 MYLTIP Units. LTIP Units (including the earned 2012 OPP Units and the earned 2013 - 2020 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 9 and 13).

Properties

At June 30, 2023, the Company owned or had joint venture interests in a portfolio of 191 commercial real estate properties (the “Properties”) aggregating approximately 54.1 million net rentable square feet of primarily premier workplaces, including 13 properties under construction/redevelopment totaling approximately 3.1 million net rentable square feet. At June 30, 2023, the Properties consisted of:

•170 office and life sciences properties (including 10 properties under construction/redevelopment);

•14 retail properties (including two properties under construction/redevelopment);

•six 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.

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Summary Of Significant Accounting Policies

6 Months Ended

Jun. 30, 2023

Accounting Policies [Abstract]

Summary Of Significant Accounting Policies

2. 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, 2022.

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 assets of each VIE are only available to satisfy such VIE's respective liabilities. The Company has identified six entities that are VIEs as of June 30, 2023 and has determined that it is the primary beneficiary for all of these entities as of June 30, 2023.

Consolidated Variable Interest Entities

As of June 30, 2023, 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 9).

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.

Fair Value Measurements

The Company follows the authoritative guidance for fair value measurements.

The table below presents for June 30, 2023 and December 31, 2022, 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”).

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

_______________

(1)If trading volume 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.

In addition, 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, sales-type lease 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 June 30, 2023 and December 31, 2022 (in thousands):

	June 30, 2023				December 31, 2022
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Related party note receivable, net	$	88,834	$	90,500	$	78,576	$	79,220
Sales-type lease receivable, net	13,250		13,173		12,811		13,045
Total	$	102,084	$	103,673	$	91,387	$	92,265
Mortgage notes payable, net	$	3,274,764	$	2,765,657	$	3,272,368	$	2,744,479
Unsecured senior notes, net	10,985,395		9,751,688		10,237,968		9,135,512
Unsecured line of credit	—		—		—		—
Unsecured term loan, net	1,196,046		1,194,895		730,000		730,000
Total	$	15,456,205	$	13,712,240	$	14,240,336	$	12,609,991

In addition to the financial instruments noted above, the Company uses interest rate swap agreements to manage its interest rate risk (See Note 7). The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves. To comply with the provisions of ASC 820, the Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. However, as of June 30, 2023, the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.

The following table presents the aggregate fair value of the Company’s interest rate swaps as of June 30, 2023 and December 31, 2022 (in thousands):

Fair value	June 30, 2023		December 31, 2022
Interest rate swaps	$	6,445	$	—

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Real Estate

6 Months Ended

Jun. 30, 2023

Real Estate [Abstract]

Real Estate

3. Real Estate

BXP

Real estate consisted of the following at June 30, 2023 and December 31, 2022 (in thousands):

	June 30, 2023		December 31, 2022
Land	$	5,189,287	$	5,189,811
Right of use assets - finance leases	237,526		237,510
Right of use assets - operating leases	166,421		167,351
Land held for future development (1)	637,191		721,501
Buildings and improvements	16,054,447		15,820,724
Tenant improvements	3,345,766		3,200,743
Furniture, fixtures and equipment	53,181		50,310
Construction in progress	482,850		406,574
Total	26,166,669		25,794,524
Less: Accumulated depreciation	(6,568,568)		(6,298,082)
	$	19,598,101	$	19,496,442

_______________

(1)Includes pre-development costs.

BPLP

Real estate consisted of the following at June 30, 2023 and December 31, 2022 (in thousands):

	June 30, 2023		December 31, 2022
Land	$	5,094,578	$	5,095,102
Right of use assets - finance leases	237,526		237,510
Right of use assets - operating leases	166,421		167,351
Land held for future development (1)	637,191		721,501
Buildings and improvements	15,782,891		15,547,919
Tenant improvements	3,345,766		3,200,743
Furniture, fixtures and equipment	53,181		50,310
Construction in progress	482,850		406,574
Total	25,800,404		25,427,010
Less: Accumulated depreciation	(6,448,665)		(6,180,474)
	$	19,351,739	$	19,246,536

_______________

(1)Includes pre-development costs.

Developments/Redevelopments

On January 5, 2023, the Company commenced the development of 290 Binney Street, an approximately 566,000 net rentable square foot laboratory/life sciences project in Cambridge, Massachusetts. Concurrent with the commencement of this project, the Kendall Center Blue Parking Garage was taken out of service and demolished to support the development of this project. 290 Binney Street is 100% pre-leased to AstraZeneca.

On January 30, 2023, the Company commenced the redevelopment of 300 Binney Street at Kendall Center in Cambridge, Massachusetts. 300 Binney Street consisted of an approximately 195,000 net rentable square foot premier workplace that is being redeveloped into approximately 236,000 net rentable square feet of laboratory/life sciences space. BXP and BPLP recognized approximately $11.0 million of depreciation expense during the six months ended June 30, 2023 associated with the acceleration of depreciation on the assets being removed from service and demolished as part of the redevelopment of the property. The project is 100% pre-leased to the Broad Institute.

On April 29, 2023, the Company completed and fully placed in-service 2100 Pennsylvania Avenue, a premier workplace project with approximately 476,000 net rentable square feet located in Washington, DC.

On June 1, 2023, the Company completed and fully placed in-service its View Boston Observatory at The Prudential Center, a redevelopment of the top three floors of 800 Boylston Street - The Prudential Center, located in Boston, Massachusetts. View Boston Observatory at The Prudential Center consists of approximately 63,000 net rentable square feet of retail, including food and beverage, and observation space.

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Leases

6 Months Ended

Jun. 30, 2023

Leases [Abstract]

Lessor, Operating Leases [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 tenant creditworthiness, current economic trends, including the impact of the COVID-19 pandemic on tenants’ businesses, and changes in tenants’ payment patterns, on a lease-by-lease basis. If the Company determines that the accrued rent and/or accounts receivable balances are no longer probable of collection then the balances are written-off and the lease is recognized on a cash basis.

If applicable, 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 can be found in Note 5.

Lessor

The following table summarizes the components of lease revenue recognized under the Company’s operating and sales-type leases for the three and six months ended June 30, 2023 and 2022 and included within the Company's Consolidated Statements of Operations (in thousands):

	Three months ended June 30,				Six months ended June 30,
Lease Revenue	2023		2022		2023		2022
Fixed contractual payments	$	629,189	$	601,351	$	1,250,835	$	1,200,958
Variable lease payments	132,315		120,548		267,318		239,061
Sales-type lease income	229		—		455		—
	$	761,733	$	721,899	$	1,518,608	$	1,440,019

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Investments in Unconsolidated Joint Ventures

6 Months Ended

Jun. 30, 2023

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 June 30, 2023 and December 31, 2022:

					Carrying Value of Investment (1)
Entity	Properties	Nominal % Ownership			June 30, 2023		December 31, 2022
					(in thousands)
Square 407 Limited Partnership	Market Square North	50.00	%		$	(6,053)	$	(6,198)
BP/CRF Metropolitan Square LLC	Metropolitan Square	20.00	%		(37,654)		(37,629)
901 New York, LLC	901 New York Avenue	25.00	%	(2)	(12,150)		(12,493)
WP Project Developer LLC	Wisconsin Place Land and Infrastructure	33.33	%	(3)	31,398		31,971
500 North Capitol Venture LLC	500 North Capitol Street, NW	30.00	%		(8,559)		(9,185)
501 K Street LLC	1001 6th Street	50.00	%		43,443		42,922
Podium Developer LLC	The Hub on Causeway - Podium	50.00	%		44,542		46,839
Residential Tower Developer LLC	Hub50House	50.00	%		44,214		45,414
Hotel Tower Developer LLC	The Hub on Causeway - Hotel Air Rights	50.00	%		12,750		12,366
Office Tower Developer LLC	100 Causeway Street	50.00	%		59,550		59,716
1265 Main Office JV LLC	1265 Main Street	50.00	%		3,583		3,465
BNY Tower Holdings LLC	Dock 72	50.00	%	(4)	(13,511)		(19,921)
CA-Colorado Center, LLC	Colorado Center	50.00	%		235,846		233,862
7750 Wisconsin Avenue LLC	7750 Wisconsin Avenue	50.00	%		50,789		52,152
BP-M 3HB Venture LLC	3 Hudson Boulevard	25.00	%		115,878		116,397
SMBP Venture LP	Santa Monica Business Park	55.00	%		161,368		164,735
Platform 16 Holdings LP	Platform 16	55.00	%	(5)	184,642		158,109
Gateway Portfolio Holdings LLC	Gateway Commons	50.00	%		349,055		324,038
Rosecrans-Sepulveda Partners 4, LLC	Beach Cities Media Campus	50.00	%		27,013		27,000
Safeco Plaza REIT LLC	Safeco Plaza	33.67	%	(6)	70,331		69,785
360 PAS Holdco LLC	360 Park Avenue South	42.21	%	(7)	112,219		114,992
PR II/BXP Reston Gateway LLC	Reston Next Residential	20.00	%		11,796		11,351
751 Gateway Holdings LLC	751 Gateway	49.00	%		89,025		80,714
200 Fifth Avenue JV LLC	200 Fifth Avenue	26.69	%		116,335		120,083
ABXP Worldgate Investments LLC	13100 and 13150 Worldgate Drive	50.00	%		17,182		N/A
					$	1,703,032	$	1,630,485

 _______________

(1)Investments with deficit balances aggregating approximately $77.9 million and $85.4 million at June 30, 2023 and December 31, 2022, 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 June 30, 2023 and December 31, 2022, 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)This property includes net equity balances from the amenity joint venture.

(5)At December 31, 2022, this entity was a VIE.

(6)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.

(7)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.

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: 

	June 30, 2023		December 31, 2022
	(in thousands)
ASSETS
Real estate and development in process, net (1)	$	6,748,400	$	6,537,554
Other assets	779,220		756,786
Total assets	$	7,527,620	$	7,294,340
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY
Mortgage and notes payable, net	$	4,056,181	$	4,022,746
Other liabilities (2)	724,078		716,271
Members’/Partners’ equity	2,747,361		2,555,323
Total liabilities and members’/partners’ equity	$	7,527,620	$	7,294,340
Company’s share of equity	$	1,301,827	$	1,238,929
Basis differentials (3)	401,205		391,556
Carrying value of the Company’s investments in unconsolidated joint ventures (4)	$	1,703,032	$	1,630,485

_______________

(1)At June 30, 2023 and December 31, 2022, this amount included right of use assets - finance leases totaling approximately $248.9 million. At June 30, 2023 and December 31, 2022, this amount included right of use assets - operating leases totaling approximately $20.6 million and $21.2 million, respectively.

(2)At June 30, 2023 and December 31, 2022, this amount included lease liabilities - finance leases totaling approximately $379.7 million and $382.2 million, respectively. At June 30, 2023 and December 31, 2022, this amount included lease liabilities - operating leases totaling approximately $30.5 million.

(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:

	June 30, 2023		December 31, 2022
Property	(in thousands)
Colorado Center	$	300,370	$	301,820
200 Fifth Avenue	96,837		94,497
Gateway Commons	48,078		47,808
Dock 72	(97,232)		(98,980)

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 $77.9 million and $85.4 million at June 30, 2023 and December 31, 2022, 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 June 30,				Six months ended June 30,
	2023		2022		2023		2022
	(in thousands)
Total revenue (1)	$	164,771	$	120,871	$	316,194	$	245,362
Expenses
Operating	61,023		45,353		118,229		90,994
Transaction costs	27		811		101		811
Depreciation and amortization	51,233		43,293		101,211		87,957
Total expenses	112,283		89,457		219,541		179,762
Other income (expense)
Loss from early extinguishment of debt	(3)		—		(3)		(1,327)
Interest expense	(58,799)		(32,219)		(116,049)		(62,592)
Unrealized gain on derivative instruments	14,457		—		3,847		—
Net income (loss)	$	8,143	$	(805)	$	(15,552)	$	1,681
Company’s share of net income (loss)	$	639	$	1,082	$	(6,263)	$	4,476
Basis differential (2)	(7,307)		(1,136)		(7,974)		(2,341)
Income (loss) from unconsolidated joint ventures	$	(6,668)	$	(54)	$	(14,237)	$	2,135

_______________ 

(1)Includes straight-line rent adjustments of approximately $6.9 million and $17.8 million for the three months ended June 30, 2023 and 2022, respectively, and approximately $13.2 million and $45.3 million for the six months ended June 30, 2023 and 2022, respectively.

(2)Includes straight-line rent adjustments of approximately $0.4 million and $0.1 million for the three months ended June 30, 2023 and 2022, respectively, and approximately $0.7 million and $0.2 million for the six months ended June 30, 2023 and 2022, respectively. Also includes net above-/below-market rent adjustments of approximately $0.2 million and $0.1 million for the three months ended June 30, 2023 and 2022, respectively, and approximately $0.4 million and $0.2 million for the six months ended June 30, 2023 and 2022.

On January 31, 2023, the Company acquired a 50% interest in a joint venture that owns 13100 and 13150 Worldgate Drive located in Herndon, Virginia for a gross purchase price of approximately $17.0 million. The acquisition was completed with available cash. 13100 and 13150 Worldgate Drive consists of two vacant office buildings aggregating approximately 350,000 rentable square feet and a 1,200-space structured parking deck situated on a 10-acre site. The joint venture intends to redevelop the property for residential use. There can be no assurance that the joint venture will commence the development as currently contemplated or at all.

On April 21, 2023, a joint venture in which the Company owns a 50% interest exercised an option to extend the maturity date of the construction loan collateralized by its 7750 Wisconsin Avenue property. Prior to the extension, the loan had a total commitment amount of approximately $252.6 million, bore interest at a variable rate equal to London interbank offered rate (“LIBOR”) plus 1.25% per annum and was scheduled to mature on April 26, 2023, with two, one-year extension options, subject to certain conditions. The extended loan continued to bear interest at LIBOR plus 1.25% per annum through June 1, 2023 after which, the interest rate was converted to a variable rate equal to Term Secured Overnight Finance Rate (“SOFR”) plus 1.35% per annum. The extended loan now matures on April 26, 2024, with a one-year extension option, subject to certain conditions. 7750 Wisconsin Avenue is a premier workplace with approximately 734,000 net rentable square feet located in Bethesda, Maryland.

On June 5, 2023, a joint venture in which the Company owns a 30% interest repaid the existing construction loan collateralized by its 500 North Capitol Street, NW property and obtained new mortgage loans with related parties. At the time of the pay off, the outstanding balance of the loan totaled approximately $105.0 million and the loan was scheduled to mature on June 6, 2023. The new mortgage loans have an aggregate principal balance of $105.0 million, bear interest at a weighted average fixed rate of 6.83% per annum and mature on June 5, 2026. The Company’s portion of the mortgage loans, $10.5 million, has been reflected as a Related Party Note

Receivable on the Company’s Consolidated Balance Sheets. 500 North Capitol Street, NW is an approximately 231,000 net rentable square foot premier workplace in Washington, DC.

On June 28, 2023, a joint venture in which the Company owns a 25% interest exercised an option to extend by 30 days the maturity date of the loan collateralized by its 3 Hudson Boulevard property. At the time of the modification, the outstanding balance of the loan totaled $80.0 million, bore interest at a variable rate equal to LIBOR plus 3.50% per annum and was scheduled to mature on July 13, 2023, with two extension options (30 days and 180 days, respectively), subject to certain conditions. The modified loan continued to bear interest at a variable rate equal to LIBOR plus 3.50% per annum for the period from June 28, 2023 through July 6, 2023. As of June 30, 2023, the loan had approximately $23.2 million of accrued interest due at the maturity date, August 13, 2023. For the period commencing on July 7, 2023 through the maturity date, the modified loan will bear interest at a variable rate equal to Term SOFR plus approximately 3.61% per annum. The modified loan now matures on August 13, 2023, with one 180 days extension option, subject to certain conditions. 3 Hudson Boulevard consists of land and improvements held for future development located in New York, New York.

During the three months ended June 30, 2023, a joint venture in which the Company has a 55% interest elected to pause vertical construction on Platform 16 in San Jose, California. Platform 16 was planned to be constructed in phases to best accommodate market demand. The first phase of the development project included the construction of an approximately 390,000 net rentable square foot premier workplace building and below-grade parking garage. The joint venture intends to complete the construction of the below-grade parking garage and building foundation elements over the next several months to facilitate a restart of construction in the future as demand improves.

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Debt

6 Months Ended

Jun. 30, 2023

Debt Disclosure [Abstract]

Unsecured Debt Disclosure

6. Debt

Unsecured Senior Notes

The following summarizes the unsecured senior notes outstanding as of June 30, 2023 (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
5 Year Unsecured Senior Notes	6.750	%	6.924	%	750,000		December 1, 2027
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
10.7 Year Unsecured Senior Notes	6.500	%	6.619	%	750,000		January 15, 2034
Total principal					11,050,000
Less:
Net unamortized discount					14,831
Deferred financing costs, net					49,774
Total					$	10,985,395

_______________

(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.

On May 15, 2023, BPLP completed a public offering of $750.0 million in aggregate principal amount of its 6.500% unsecured senior notes due 2034. The notes were priced at 99.697% of the principal amount to yield an effective rate (including financing fees) of approximately 6.619% per annum to maturity. The notes will mature on January 15, 2034, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $741.3 million after deducting underwriting discounts and transaction expenses.

The indenture relating to the unsecured senior notes contains certain financial restrictions and requirements, including (1) a leverage ratio not to exceed 60%, (2) a secured debt leverage ratio not to exceed 50%, (3) an interest coverage ratio of greater than 1.50, and (4) an unencumbered asset value of not less than 150% of unsecured debt. At June 30, 2023, BPLP was in compliance with each of these financial restrictions and requirements.

Unsecured Credit Facility

On June 1, 2023, BPLP amended its unsecured credit facility (as amended, the “2021 Credit Facility”) to replace the LIBOR-based daily floating rate option with a SOFR-based daily floating rate option and to add options for SOFR-based term floating rates and rates for alternative currency loans. In addition, the amendment added a SOFR credit spread adjustment of 0.10%. Other than the foregoing, the material terms of the 2021 Credit Facility remain unchanged.

The 2021 Credit Facility provides for borrowings of up to $1.5 billion through BPLP’s revolving facility (the “Revolving Facility”), subject to customary conditions. The 2021 Credit Facility matures on June 15, 2026 and includes 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.

At BPLP’s option, loans under the 2021 Credit Facility will bear interest at a rate per annum equal to (1) (a) in the case of loans denominated in Dollars, Term SOFR and SOFR, (b) in the case of loans denominated in Euro, EURIBOR, (c) in the case of loans denominated in Canadian Dollars, CDOR, and (d) in the case of loans denominated in Sterling, SONIA, in each case, plus a margin ranging from 70.0 to 140.0 basis points based on BPLP’s credit rating or (2) an alternate base rate equal to the greatest 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%, in each case, plus a margin ranging from 0 to 40 basis points based on BPLP’s credit rating.

The 2021 Credit Facility also features a sustainability-linked pricing component such that if BPLP meets certain sustainability performance targets, the applicable per annum interest rate will be reduced by one basis point. In addition, the 2021 Credit Facility contains a competitive bid option for up to 65% of the Revolving Facility that allows banks that are part of the lender consortium to bid to make loan advances to BPLP at a reduced interest rate.

Pursuant to the 2021 Credit Facility, BPLP is obligated to pay (1) in quarterly installments a facility fee on the total commitment under the Revolving Facility at a rate per annum ranging from 0.10% to 0.30% based on BPLP’s credit rating and (2) an annual fee on the undrawn amount of each letter of credit ranging from 0.70% to 1.40% based on BPLP’s credit rating.

Based on BPLP’s June 30, 2023 credit rating, (1) the applicable Daily SOFR, Term SOFR, alternative currency daily rate, and alternative currency term 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 June 30, 2023, BPLP had no amount outstanding under the Revolving Facility.

Unsecured Term Loan

On January 4, 2023, BPLP entered into a credit agreement that provided for a $1.2 billion unsecured term loan facility (the “2023 Unsecured Term Loan”). Under the credit agreement, BPLP may, at any time prior to the maturity date, increase total commitments by up to an additional $300.0 million in aggregate principal amount by increasing the existing 2023 Unsecured Term Loan or incurring one or more additional term loans, in each case, subject to syndication of the increase and other conditions. The 2023 Unsecured Term Loan matures on May 16, 2024, with one 12-month extension option, subject to customary conditions. Upon entry into the credit agreement, BPLP exercised its option to draw $1.2 billion under the 2023 Unsecured Term Loan, a portion of which was used to repay in full the $730.0 million outstanding under its prior unsecured credit agreement (the “2022 Unsecured Term Loan”), which was scheduled to mature on May 16, 2023. There was no prepayment penalty associated with the

repayment of the 2022 Unsecured Term Loan.

At BPLP’s option, loans under the 2023 Unsecured Term Loan will bear interest at a rate per annum equal to (1) a base rate equal to the greatest of (a) the Federal Funds rate plus 0.5%, (b) the administrative agent’s prime rate, (c) Term SOFR for a one-month period plus 1.00%, and (d) 1.00%, in each case, plus a margin ranging from 0 to 60 basis points based on BPLP’s credit rating; or (2) a rate equal to adjusted Term SOFR with a one-month period plus a margin ranging from 75 to 160 basis points based on BPLP’s credit rating. Based on BPLP’s credit rating upon entry into the credit agreement, the base rate margin is 0 basis points and the Term SOFR margin is 0.85%. As of June 30, 2023, the 2023 Unsecured Term Loan bears interest at a rate equal to adjusted Term SOFR plus 0.85% (see Note 7). At June 30, 2023, BPLP had $1.2 billion outstanding under the 2023 Unsecured Term Loan.

2021 Credit Facility and 2023 Unsecured Term Loan Compliance

The agreements governing the 2021 Credit Facility and 2023 Unsecured Term Loan contain 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, in the case of the 2021 Credit Facility, all outstanding amounts and the cancellation of all commitments outstanding under the 2021 Credit Facility and, in the case of the 2023 Unsecured Term Loan, any outstanding amount under the 2023 Unsecured Term Loan. Among other covenants, the 2021 Credit Facility and the 2023 Unsecured Term Loan require 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 June 30, 2023, BPLP was in compliance with each of these financial and other covenant requirements.

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Derivative Instruments and Hedging Activities

6 Months Ended

Jun. 30, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments and Hedging Activities Disclosure

7. Derivative Instruments and Hedging Activities

On May 2, 2023, BPLP entered into four interest rate swap contracts with notional amounts aggregating $1.2 billion. BPLP entered into these interest rate swap contracts to reduce its exposure to the variability in future cash flows attributable to changes in the 2023 Unsecured Term Loan interest rate. These interest rate swaps were entered into to fix Term SOFR, the reference rate for BPLP’s 2023 Unsecured Term Loan, at a weighted-average rate of 4.6420% for the period commencing on May 4, 2023 and ending on May 16, 2024 (see Note 6). For the period from May 4, 2023 through June 30, 2023, the Company recognized approximately $(0.9) million of interest expense related to its interest rate swap contracts.

BPLP assesses the effectiveness of its hedges both at inception and on an ongoing basis. If the hedges are deemed to be effective, the fair value is recorded in “Accumulated other comprehensive loss” in the Company’s Consolidated Balance Sheets and is subsequently reclassified into “Interest expense” in the Company’s Consolidated Statements of Operations in the period that the hedged forecasted transactions affect earnings. BPLP’s derivative financial instruments are cash flow hedges that are designated as effective hedges, and are carried at their estimated fair value on a recurring basis (See Note 2). The Company did not incur any ineffectiveness during the three months ended June 30, 2023.

BPLP’s interest rate swap contracts consisted of the following at June 30, 2023 (dollars in thousands):

Derivative Instrument	Aggregate Notional Amount				Strike Rate Range					Balance Sheet Location
			Effective Date	Maturity Date	Low			High			Fair Value
Interest Rate Swaps	$	1,200,000	May 4, 2023	May 16, 2024	4.638	%	—	4.646	%	Prepaid expenses and other assets	$	6,445

The following table presents the location in the financial statements of the gains or losses recognized related to the Company’s cash flow hedges for the three and six months ended June 30, 2023 and 2022 (dollars in thousands):

	Three months ended June 30,				Six months ended June 30,
	2023		2022		2023		2022
Amount of gain (loss) related to the effective portion recognized in other comprehensive income (1)	$	14,965	$	35	$	8,427	$	7,600
Amount of gain (loss) related to the effective portion subsequently reclassified to earnings (2)	$	1,674	$	1,677	$	3,349	$	3,353
Amount of gain (loss) relate do the ineffective portion and amount excluded from effectiveness testing	$	—	$	—	$	—	$	—

_______________

(1)Includes the Company’s share of gain (loss) related to the effective portion of derivatives outstanding at its unconsolidated joint venture properties.

(2)Consists of amounts from previous interest rate programs.

BPLP has formally documented all of its relationships between hedge instruments and hedging items, as well as its risk-management objectives and strategy for undertaking various hedge transactions. While management believes its judgments are reasonable, a change in a derivative's effectiveness as a hedge could materially affect expenses, net income (loss) and equity.

BPLP’s agreements with the swap derivative counterparties contain provisions whereby if BPLP defaults on the underlying indebtedness, including defaults where repayment of the indebtedness has not been accelerated by the lender, then BPLP could also be declared in default of the swap derivative obligation. As of June 30, 2023, the Company had not posted any collateral related to the agreements.

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Commitments And Contingencies

6 Months Ended

Jun. 30, 2023

Commitments and Contingencies Disclosure [Abstract]

Commitments And Contingencies

8. Commitments and Contingencies

General

In the normal course of business, the Company guarantees its performance of services or indemnifies third parties against its negligence. In addition, in the normal course of business, the Company guarantees to certain tenants the obligations of its subsidiaries for the payment of tenant improvement allowances and brokerage commissions in connection with their leases and limited costs arising from delays in delivery of their premises. 

The Company had letter of credit and performance obligations related to lender and development requirements that total approximately $21.6 million at June 30, 2023.

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, tenants 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 June 30, 2023, the maximum funding obligation under the guarantee was approximately $11.2 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 June 30, 2023, no amounts related to the guarantee were recorded as liabilities in the Company’s consolidated financial statements.

In connection with the development of the Company’s 290 Binney Street project located in Cambridge, Massachusetts, which commenced on January 5, 2023 (see Note 3), the Cambridge Zoning Ordinance requires that

a building permit for the construction of a residential project of at least 400,000 square feet be issued prior to or concurrently with the issuance of a building permit for the commercial building. 290 Binney Street and the residential project are components of the Company’s future life sciences development project located in the heart of Kendall Square in Cambridge, Massachusetts. When completed the Company expects the project will consist of two premier workplace properties aggregating approximately 1.1 million rentable square feet of life sciences space and the approximately 400,000 square foot residential building. The commencement of construction of each phase of the overall project is 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 of the remaining phases on the terms and schedule currently contemplated or at all.

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 5% 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.

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Noncontrolling Interests

6 Months Ended

Jun. 30, 2023

Noncontrolling Interest [Abstract]

Noncontrolling Interest Disclosure [Text Block]

9. 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 June 30, 2023, the noncontrolling interests in BPLP consisted of 16,522,540 OP Units, 2,135,852 LTIP Units (including 514,715 LTIP Units earned by employees under the Company’s multi-year long-term incentive awards granted between 2012 and 2020 (i.e., 2012 OPP and 2013 - 2020 MYLTIP awards)), 349,267 2021 MYLTIP Units, 252,151 2022 MYLTIP Units and 322,053 2023 MYLTIP Units held by parties other than BXP.

Noncontrolling Interest—Common Units

During the six months ended June 30, 2023, 21,346 OP Units were presented by the holders for redemption (including an aggregate of 21,346 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 June 30, 2023, BPLP had outstanding 349,267 2021 MYLTIP Units, 252,151 2022 MYLTIP Units and 322,053 2023 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 - 2023 MYLTIP, 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 - 2023 MYLTIP Units.

On February 3, 2023, the measurement period for the Company’s 2020 MYLTIP awards ended and, based on BXP’s relative TSR performance, the final payout was determined to be 50% of target, or an aggregate of approximately $3.8 million (after giving effect to employee separations). As a result, an aggregate of 152,460 2020 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 - 2019 MYLTIP Units and, after the February 3, 2023 measurement date, the 2020 MYLTIP Units) and its distributions on the 2020 MYLTIP Units (prior to the February 3, 2023 measurement date) and 2021 - 2023 MYLTIP Units (after the February 7, 2023 issuance date of the 2023 MYLTIP Units) that occurred during the six months ended June 30, 2023:

Record Date	Payment Date	Distributions per OP Unit and LTIP Unit	Distributions per MYLTIP Unit
June 30, 2023	July 31, 2023	$0.98	$0.098
March 31, 2023	April 28, 2023	$0.98	$0.098
December 30, 2022	January 30, 2023	$0.98	$0.098

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 six months ended June 30, 2022:

Record Date	Payment Date	Distributions per OP Unit and LTIP Unit	Distributions per MYLTIP Unit
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

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 - 2020 MYLTIP Units), assuming in each case that all conditions had been met for the conversion thereof, had all of such units been redeemed at June 30, 2023 was approximately $1.1 billion based on the last reported price of a share of Common Stock on the New York Stock Exchange of $57.59 per share on June 30, 2023.

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 and $1.5 billion at June 30, 2023 and December 31, 2022, respectively, are included in Noncontrolling Interests—Property Partnerships on the accompanying Consolidated Balance Sheets.

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Stockholders' Equity / Partners' Capital

6 Months Ended

Jun. 30, 2023

Equity [Abstract]

Stockholders' Equity / Partners' Capital

10. Stockholders’ Equity / Partners’ Capital

As of June 30, 2023, BXP had 156,853,400 shares of Common Stock outstanding.

As of June 30, 2023, BXP owned 1,755,118 general partnership units and 155,098,282 limited partnership units in BPLP.

On May 17, 2023, 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 May 22, 2023. 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 six months ended June 30, 2023, BXP did not issue any shares of Common Stock upon the exercise of options to purchase Common Stock. As a result of the applicable exercise period ending, 103,641 options were forfeited during the six months ended June 30, 2023. As of June 30, 2023, BXP no longer has any outstanding options.

During the six months ended June 30, 2023, BXP issued 21,346 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 2023 and during the six months ended June 30, 2022:

Record Date	Payment Date	Dividend (Per Share)	Distribution (Per Unit)
June 30, 2023	July 31, 2023	$0.98	$0.98
March 31, 2023	April 28, 2023	$0.98	$0.98
December 30, 2022	January 30, 2023	$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

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Segment Information

6 Months Ended

Jun. 30, 2023

Segment Reporting [Abstract]

Segment Reporting Disclosure [Text Block]

11. Segment Information

The following tables present reconciliations of Net Income Attributable to Boston Properties, Inc. to the Company’s share of Net Operating Income and Net Income Attributable to Boston Properties Limited Partnership to the Company’s share of Net Operating Income for the three and six months ended June 30, 2023 and 2022.

BXP

	Three months ended June 30,				Six months ended June 30,
	2023		2022		2023		2022
	(in thousands)
Net income attributable to Boston Properties, Inc.	$	104,299	$	222,989	$	182,215	$	366,044
Add:
Noncontrolling interest—common units of the Operating Partnership	12,117		25,708		21,169		42,061
Noncontrolling interests in property partnerships	19,768		18,546		38,428		36,095
Interest expense	142,473		104,142		276,680		205,370
Net operating income from unconsolidated joint ventures	42,254		35,710		83,010		73,031
Depreciation and amortization expense	202,577		183,146		411,311		360,770
Transaction costs	308		496		1,219		496
Payroll and related costs from management services contracts	4,609		3,239		9,844		7,304
General and administrative expense	44,175		34,665		99,977		77,859
Less:
Net operating income attributable to noncontrolling interests in property partnerships	47,958		47,862		95,055		94,917
Unrealized gain on non-real estate investment	124		—		383		—
Gains (losses) from investments in securities	1,571		(4,716)		3,236		(6,978)
Other income - assignment fee	—		6,624		—		6,624
Interest and other income (loss)	17,343		1,195		28,284		2,423
Gains on sales of real estate	—		96,247		—		118,948
Income (loss) from unconsolidated joint ventures	(6,668)		(54)		(14,237)		2,135
Direct reimbursements of payroll and related costs from management services contracts	4,609		3,239		9,844		7,304
Development and management services revenue	9,858		6,354		18,838		12,185
Company’s share of Net Operating Income	$	497,785	$	471,890	$	982,450	$	931,472

BPLP

	Three months ended June 30,				Six months ended June 30,
	2023		2022		2023		2022
	(in thousands)
Net income attributable to Boston Properties Limited Partnership	$	118,098	$	253,788	$	206,928	$	415,617
Add:
Noncontrolling interests in property partnerships	19,768		18,546		38,428		36,095
Interest expense	142,473		104,142		276,680		205,370
Net operating income from unconsolidated joint ventures	42,254		35,710		83,010		73,031
Depreciation and amortization expense	200,895		181,416		407,767		357,302
Transaction costs	308		496		1,219		496
Payroll and related costs from management services contracts	4,609		3,239		9,844		7,304
General and administrative expense	44,175		34,665		99,977		77,859
Less:
Net operating income attributable to noncontrolling interests in property partnerships	47,958		47,862		95,055		94,917
Unrealized gain on non-real estate investment	124		—		383		—
Gains (losses) from investments in securities	1,571		(4,716)		3,236		(6,978)
Other income - assignment fee	—		6,624		—		6,624
Interest and other income (loss)	17,343		1,195		28,284		2,423
Gains on sales of real estate	—		99,608		—		122,992
Income (loss) from unconsolidated joint ventures	(6,668)		(54)		(14,237)		2,135
Direct reimbursements of payroll and related costs from management services contracts	4,609		3,239		9,844		7,304
Development and management services revenue	9,858		6,354		18,838		12,185
Company’s share of Net Operating Income	$	497,785	$	471,890	$	982,450	$	931,472

Net operating income (“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, depreciation and amortization expense, transaction costs, payroll and related costs from management services contracts and corporate general and administrative expense less (2) unrealized gain on non-real estate investment, gains (losses) from investments in securities, other income - assignment fee, interest and other income (loss), gains on sales of real estate, income (loss) from unconsolidated joint ventures, 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. 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 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, as defined above, also does not include its share of losses from early extinguishment of debt from unconsolidated joint ventures and unrealized gain on derivative instruments, 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. Interest expense, depreciation and amortization expense, transaction costs, payroll and related costs from management services contracts, corporate general and administrative expense, unrealized gain on non-real estate investment, gains (losses) from investments in securities, other income - assignment fee, interest and other income (loss), gains on sales of real estate, income (loss) from unconsolidated joint ventures, 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.

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. The Company also presents information for each segment by property type, including Premier Workplace (which includes office, life sciences and retail), Residential and Hotel.

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

For the three months ended June 30, 2023:

	Boston			Los Angeles			New York			San Francisco			Seattle			Washington, DC			Total
Rental Revenue: (1)
Premier Workplace	$	269,464		$	—		$	262,979		$	136,241		$	17,060		$	90,720		$	776,464
Residential	4,124			—			—			3,864			—			4,265			12,253
Hotel	13,969			—			—			—			—			—			13,969
Total	287,557			—			262,979			140,105			17,060			94,985			802,686
% of Grand Totals	35.83		%	—		%	32.76		%	17.45		%	2.13		%	11.83		%	100.00		%
Rental Expenses:
Premier Workplace	95,597			—			102,948			48,197			3,082			35,429			285,253
Residential	1,601			—			—			2,215			—			1,967			5,783
Hotel	8,161			—			—			—			—			—			8,161
Total	105,359			—			102,948			50,412			3,082			37,396			299,197
% of Grand Totals	35.21		%	—		%	34.41		%	16.85		%	1.03		%	12.50		%	100.00		%
Net operating income	$	182,198		$	—		$	160,031		$	89,693		$	13,978		$	57,589		$	503,489
% of Grand Totals	36.19		%	—		%	31.78		%	17.81		%	2.78		%	11.44		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(11,343)			—			(36,615)			—			—			—			(47,958)
Add: Company’s share of net operating income from unconsolidated joint ventures	8,771			12,768			3,363			3,332			1,878			12,142			42,254
Company’s share of net operating income	$	179,626		$	12,768		$	126,779		$	93,025		$	15,856		$	69,731		$	497,785
% of Grand Totals	36.08		%	2.56		%	25.47		%	18.69		%	3.19		%	14.01		%	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 June 30, 2022:

	Boston			Los Angeles			New York			San Francisco			Seattle			Washington, DC			Total
Rental Revenue: (1)
Premier Workplace	$	244,936		$	—		$	254,264		$	133,707		$	6,472		$	95,954		$	735,333
Residential	3,748			—			—			5,850			—			7,314			16,912
Hotel	12,089			—			—			—			—			—			12,089
Total	260,773			—			254,264			139,557			6,472			103,268			764,334
% of Grand Totals	34.11		%	—		%	33.27		%	18.26		%	0.85		%	13.51		%	100.00		%
Rental Expenses:
Premier Workplace	87,027			—			95,363			45,201			1,680			34,759			264,030
Residential	1,492			—			—			5,145			—			3,181			9,818
Hotel	6,444			—			—			—			—			—			6,444
Total	94,963			—			95,363			50,346			1,680			37,940			280,292
% of Grand Totals	33.88		%	—		%	34.02		%	17.96		%	0.60		%	13.54		%	100.00		%
Net operating income	$	165,810		$	—		$	158,901		$	89,211		$	4,792		$	65,328		$	484,042
% of Grand Totals	34.25		%	—		%	32.83		%	18.43		%	0.99		%	13.50		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(11,377)			—			(36,485)			—			—			—			(47,862)
Add: Company’s share of net operating income (loss) from unconsolidated joint ventures	8,134			13,247			18			3,183			1,944			9,184			35,710
Company’s share of net operating income	$	162,567		$	13,247		$	122,434		$	92,394		$	6,736		$	74,512		$	471,890
% of Grand Totals	34.44		%	2.81		%	25.95		%	19.58		%	1.43		%	15.79		%	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 six months ended June 30, 2023:

	Boston			Los Angeles			New York			San Francisco			Seattle			Washington, DC			Total
Rental Revenue: (1)
Premier Workplace	$	539,415		$	—		$	521,171		$	272,334		$	31,318		$	181,384		$	1,545,622
Residential	8,173			—			—			7,506			—			8,300			23,979
Hotel	22,070			—			—			—			—			—			22,070
Total	569,658			—			521,171			279,840			31,318			189,684			1,591,671
% of Grand Totals	35.79		%	—		%	32.74		%	17.58		%	1.97		%	11.92		%	100.00		%
Rental Expenses:
Premier Workplace	195,646			—			205,433			94,282			6,042			69,695			571,098
Residential	3,153			—			—			4,388			—			3,705			11,246
Hotel	14,832			—			—			—			—			—			14,832
Total	213,631			—			205,433			98,670			6,042			73,400			597,176
% of Grand Totals	35.78		%	—		%	34.40		%	16.52		%	1.01		%	12.29		%	100.00		%
Net operating income	$	356,027		$	—		$	315,738		$	181,170		$	25,276		$	116,284		$	994,495
% of Grand Totals	35.80		%	—		%	31.75		%	18.22		%	2.54		%	11.69		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(22,160)			—			(72,895)			—			—			—			(95,055)
Add: Company’s share of net operating income (loss) from unconsolidated joint ventures	17,348			25,993			7,013			6,796			3,724			22,136			83,010
Company’s share of net operating income	$	351,215		$	25,993		$	249,856		$	187,966		$	29,000		$	138,420		$	982,450
% of Grand Totals	35.75		%	2.65		%	25.43		%	19.13		%	2.95		%	14.09		%	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 six months ended June 30, 2022:

	Boston			Los Angeles			New York			San Francisco			Seattle				Washington, DC			Total
Rental Revenue: (1)
Premier Workplace	$	487,014		$	—		$	511,134		$	266,082		$	6,472			$	191,519		$	1,462,221
Residential	7,344			—			—			8,241			—				14,293			29,878
Hotel	16,646			—			—			—			—				—			16,646
Total	511,004			—			511,134			274,323			6,472				205,812			1,508,745
% of Grand Totals	33.87		%	—		%	33.88		%	18.18		%	0.43		%		13.64		%	100.00		%
Rental Expenses:
Premier Workplace	177,555			—			191,703			88,609			1,680				68,306			527,853
Residential	2,929			—			—			7,013			—				6,308			16,250
Hotel	11,284			—			—			—			—				—			11,284
Total	191,768			—			191,703			95,622			1,680			—	74,614			555,387
% of Grand Totals	34.53		%	—		%	34.52		%	17.22		%	0.30		%		13.43		%	100.00		%
Net operating income	$	319,236		$	—		$	319,431		$	178,701		$	4,792			$	131,198		$	953,358
% of Grand Totals	33.49		%	—		%	33.51		%	18.74		%	0.50		%		13.76		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(23,112)			—			(71,805)			—			—				—			(94,917)
Add: Company’s share of net operating income (loss) from unconsolidated joint ventures	17,827			27,004			(138)			6,364			3,899				18,075			73,031
Company’s share of net operating income	$	313,951		$	27,004		$	247,488		$	185,065		$	8,691			$	149,273		$	931,472
% of Grand Totals	33.70		%	2.90		%	26.57		%	19.87		%	0.93		%		16.03		%	100.00		%

  _______________

(1)Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.

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Earnings Per Share / Common Unit

6 Months Ended

Jun. 30, 2023

Earnings Per Share [Abstract]

Earnings Per Share / Common Unit

12. Earnings Per Share / Common Unit

BXP

The following table provides a reconciliation of both the net income attributable to Boston Properties, Inc. 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. 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 - 2020 MYLTIP Units required, and the 2021 - 2023 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 June 30, 2023
	Income (Numerator)		Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc.	$	104,299	156,826	$	0.67
Effect of Dilutive Securities:
Stock Based Compensation	—		392	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties, Inc.	$	104,299	157,218	$	0.66
	Three months ended June 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.	$	222,989	156,720	$	1.42
Allocation of undistributed earnings to participating securities	(267)		—	—
Net income attributable to Boston Properties, Inc.	222,722		156,720	1.42
Effect of Dilutive Securities:
Stock Based Compensation	—		472	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc.	$	222,722	157,192	$	1.42

	Six months ended June 30, 2023
	Income (Numerator)		Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc.	$	182,215	156,815	$	1.16
Effect of Dilutive Securities:
Stock Based Compensation	—		316	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc.	$	182,215	157,131	$	1.16

	Six months ended June 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.	$	366,044	156,685	$	2.33
Allocation of undistributed earnings to participating securities	(236)		—	—
Net income attributable to Boston Properties, Inc.	365,808		156,685	2.33
Effect of Dilutive Securities:
Stock Based Compensation	—		413	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc.	$	365,808	157,098	$	2.33

BPLP

The following table provides a reconciliation of both the net income attributable to Boston Properties Limited Partnership 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 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 - 2020 MYLTIP Units required, and the 2021 - 2023 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 17,922,000 and 17,672,000 redeemable common units for the three months ended June 30, 2023 and 2022, respectively, and 17,878,000 and 17,638,000 redeemable common units for the six months ended June 30, 2023 and 2022, respectively.

	Three months ended June 30, 2023
	Income (Numerator)		Units (Denominator)	Per Unit Amount
	(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership	$	118,098	174,748	$	0.68
Effect of Dilutive Securities:
Stock Based Compensation	—		392	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership	$	118,098	175,140	$	0.67

	Three months ended June 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	$	253,788	174,392	$	1.45
Allocation of undistributed earnings to participating securities	(297)		—	—
Net income attributable to Boston Properties Limited Partnership	253,491		174,392	1.45
Effect of Dilutive Securities:
Stock Based Compensation	—		472	—
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership	$	253,491	174,864	$	1.45

	Six months ended June 30, 2023
	Income (Numerator)		Units (Denominator)	Per Unit Amount
	(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership	$	206,928	174,693	$	1.18
Effect of Dilutive Securities:
Stock Based Compensation	—		316	—
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership	$	206,928	175,009	$	1.18
	Six months ended June 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	$	415,617	174,323	$	2.38
Allocation of undistributed earnings to participating securities	(263)		—	—
Net income attributable to Boston Properties Limited Partnership	415,354		174,323	2.38
Effect of Dilutive Securities:
Stock Based Compensation	—		413	—
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership	$	415,354	174,736	$	2.38

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Stock Option and Incentive Plan

6 Months Ended

Jun. 30, 2023

Share-Based Payment Arrangement [Abstract]

Stock Option and Incentive Plan

13. Stock Option and Incentive Plan

On January 25, 2023, BXP’s Compensation Committee approved the grant of 2023 MYLTIP awards under the Boston Properties, Inc. 2021 Stock Incentive Plan (the “2021 Plan”) to certain executive officers of BXP, effective February 7, 2023. The 2023 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.

Total earned awards under the 2023 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 322,053 LTIP Units with a target of approximately 161,026 LTIP Units and linear interpolation between zero and maximum. Earned awards (if any) will vest 100% on February 6, 2026, but, in general, may not be converted, redeemed, sold or otherwise transferred for one additional year thereafter. The 2023 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 2023 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 2023 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 2023 MYLTIP Units during the performance period on all of the awarded 2023 MYLTIP Units. Under ASC 718 “Compensation - Stock Compensation,” the 2023 MYLTIP awards have an aggregate value of approximately $13.1 million, which amount will generally be amortized into earnings under the graded vesting method.

On February 3, 2023, the measurement period for the Company’s 2020 MYLTIP awards ended and, based on BXP’s relative TSR performance, the final payout was determined to be 50% of target, or an aggregate of approximately $3.8 million (after giving effect to employee separations). As a result, an aggregate of 152,460 2020 MYLTIP Units that had been previously granted were automatically forfeited.

During the six months ended June 30, 2023, BXP issued 73,414 shares of restricted common stock and BPLP issued 427,176 LTIP Units and 322,053 2023 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 2023 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 six months ended June 30, 2023 were valued at approximately $5.4 million. The LTIP Units granted were valued at approximately $29.2 million using a Monte Carlo simulation method model. Because the 2012 OPP Units and 2013 - 2023 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 $14.9 million and $14.6 million for the three months ended June 30, 2023 and 2022, respectively, and $40.9 million and $35.5 million for the six months ended June 30, 2023 and 2022, respectively. At June 30, 2023, there was (1) an aggregate of approximately $29.2 million of unrecognized compensation expense related to unvested restricted stock, LTIP Units and 2020 MYLTIP Units and (2) an aggregate of approximately $0.8 million of unrecognized compensation expense related to unvested 2021 - 2023 MYLTIP Units that is expected to be recognized over a weighted-average period of approximately 2.7 years.

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Subsequent Events

6 Months Ended

Jun. 30, 2023

Subsequent Events [Abstract]

Subsequent Events

14. Subsequent Events

On July 20, 2023, the Company completed and fully placed in-service 140 Kendrick Street - Building A, a premier workplace redevelopment project with approximately 104,000 net rentable square feet located in Needham, Massachusetts.

On July 28, 2023, the Company entered into a joint venture agreement with an institutional investor for the future development of 343 Madison Avenue located on Madison Avenue between 44th and 45th Streets in New York City, New York adjacent to Grand Central Station. The Company owns a 55% interest in the venture and its partner owns a 45% interest, and the Company will provide customary development, property management, and leasing services. The 343 Madison Avenue project contemplates the construction of (1) a direct entrance to the Long Island

Railroad’s new east side access project (Grand Central Madison) (“Phase 1”) and (2) an approximately 900,000 square foot premier workplace building with ground floor retail (“Phase 2”). Subsequently, on August 1, 2023, the joint venture executed a 99-year ground lease with the Metropolitan Transportation Authority for the approximately 25,000 square foot site. The ground lease requires the joint venture to construct the direct access to Grand Central Madison as Phase 1 of the development project. The joint venture has the option until July 31, 2025 to terminate the ground lease prior to construction of the new building and receive reimbursement for the cost of the construction of access to Grand Central Station. There can be no assurance that Phase 1 will be completed on the terms currently contemplated or that Phase 2 of the development project will commence on the terms currently contemplated or at all.

On July 28, 2023, a joint venture in which the Company has a 50% interest modified and exercised an option to extend by one year the maturity date of its loan collateralized by 100 Causeway Street. At the time of the modification and extension, the loan had an outstanding balance totaling approximately $340.6 million, bore interest at Term SOFR plus 1.60% per annum, and was scheduled to mature on September 5, 2023. The modified and extended loan has an outstanding balance of $336.6 million, which included an approximately $4.0 million principal repayment, bears interest at Term SOFR plus 1.48% per annum, and matures on September 5, 2024, with an additional one-year extension option, subject to certain conditions. 100 Causeway Street is an approximately 634,000 square foot premier workplace located in Boston, Massachusetts and is approximately 95% leased.

Effective July 28, 2023, BXP’s independent directors appointed Joel I. Klein to serve as the lead independent director, replacing Kelly A. Ayotte. Ms. Ayotte stepped down as the lead independent director due to the additional time commitment and responsibilities of that role, and the independent directors determined that it is in the best interests of BXP and its stockholders that Mr. Klein once again assume that role. Ms. Ayotte served as BXP’s lead independent director since May 2022 and will remain on BXP’s Board of Directors. Mr. Klein previously served as BXP’s lead independent director from May 2016 to May 2019 and as its independent Chairman from May 2019 to May 2022.

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Summary Of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2023
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, 2022.
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.
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.

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Summary Of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2023

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.

The table below presents for June 30, 2023 and December 31, 2022, 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”).

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

_______________

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

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, sales-type lease 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 June 30, 2023 and December 31, 2022 (in thousands):

	June 30, 2023				December 31, 2022
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Related party note receivable, net	$	88,834	$	90,500	$	78,576	$	79,220
Sales-type lease receivable, net	13,250		13,173		12,811		13,045
Total	$	102,084	$	103,673	$	91,387	$	92,265
Mortgage notes payable, net	$	3,274,764	$	2,765,657	$	3,272,368	$	2,744,479
Unsecured senior notes, net	10,985,395		9,751,688		10,237,968		9,135,512
Unsecured line of credit	—		—		—		—
Unsecured term loan, net	1,196,046		1,194,895		730,000		730,000
Total	$	15,456,205	$	13,712,240	$	14,240,336	$	12,609,991

Schedule of Derivative Assets at Fair Value [Table Text Block]

In addition to the financial instruments noted above, the Company uses interest rate swap agreements to manage its interest rate risk (See Note 7). The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves. To comply with the provisions of ASC 820, the Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. However, as of June 30, 2023, the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.

The following table presents the aggregate fair value of the Company’s interest rate swaps as of June 30, 2023 and December 31, 2022 (in thousands):

Fair value	June 30, 2023		December 31, 2022
Interest rate swaps	$	6,445	$	—

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Real Estate (Tables)

6 Months Ended

Jun. 30, 2023

Real Estate Properties [Line Items]

Schedule of Real Estate Properties

BXP

Real estate consisted of the following at June 30, 2023 and December 31, 2022 (in thousands):

	June 30, 2023		December 31, 2022
Land	$	5,189,287	$	5,189,811
Right of use assets - finance leases	237,526		237,510
Right of use assets - operating leases	166,421		167,351
Land held for future development (1)	637,191		721,501
Buildings and improvements	16,054,447		15,820,724
Tenant improvements	3,345,766		3,200,743
Furniture, fixtures and equipment	53,181		50,310
Construction in progress	482,850		406,574
Total	26,166,669		25,794,524
Less: Accumulated depreciation	(6,568,568)		(6,298,082)
	$	19,598,101	$	19,496,442

_______________

(1)Includes pre-development costs.

Boston Properties Limited Partnership

Real Estate Properties [Line Items]

Schedule of Real Estate Properties

BPLP

Real estate consisted of the following at June 30, 2023 and December 31, 2022 (in thousands):

	June 30, 2023		December 31, 2022
Land	$	5,094,578	$	5,095,102
Right of use assets - finance leases	237,526		237,510
Right of use assets - operating leases	166,421		167,351
Land held for future development (1)	637,191		721,501
Buildings and improvements	15,782,891		15,547,919
Tenant improvements	3,345,766		3,200,743
Furniture, fixtures and equipment	53,181		50,310
Construction in progress	482,850		406,574
Total	25,800,404		25,427,010
Less: Accumulated depreciation	(6,448,665)		(6,180,474)
	$	19,351,739	$	19,246,536

_______________

(1)Includes pre-development costs.

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Leases (Tables)

6 Months Ended

Jun. 30, 2023

Lessor, Lease, Description [Line Items]

Operating Lease, Lease Income [Table Text Block]

The following table summarizes the components of lease revenue recognized under the Company’s operating and sales-type leases for the three and six months ended June 30, 2023 and 2022 and included within the Company's Consolidated Statements of Operations (in thousands):

	Three months ended June 30,				Six months ended June 30,
Lease Revenue	2023		2022		2023		2022
Fixed contractual payments	$	629,189	$	601,351	$	1,250,835	$	1,200,958
Variable lease payments	132,315		120,548		267,318		239,061
Sales-type lease income	229		—		455		—
	$	761,733	$	721,899	$	1,518,608	$	1,440,019

Sales-type Lease, Lease Income

The following table summarizes the components of lease revenue recognized under the Company’s operating and sales-type leases for the three and six months ended June 30, 2023 and 2022 and included within the Company's Consolidated Statements of Operations (in thousands):

	Three months ended June 30,				Six months ended June 30,
Lease Revenue	2023		2022		2023		2022
Fixed contractual payments	$	629,189	$	601,351	$	1,250,835	$	1,200,958
Variable lease payments	132,315		120,548		267,318		239,061
Sales-type lease income	229		—		455		—
	$	761,733	$	721,899	$	1,518,608	$	1,440,019

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Investments in Unconsolidated Joint Ventures (Tables)

6 Months Ended

Jun. 30, 2023

Schedule of Equity Method Investments [Line Items]

Investments In Unconsolidated Joint Ventures

The investments in unconsolidated joint ventures consist of the following at June 30, 2023 and December 31, 2022:

					Carrying Value of Investment (1)
Entity	Properties	Nominal % Ownership			June 30, 2023		December 31, 2022
					(in thousands)
Square 407 Limited Partnership	Market Square North	50.00	%		$	(6,053)	$	(6,198)
BP/CRF Metropolitan Square LLC	Metropolitan Square	20.00	%		(37,654)		(37,629)
901 New York, LLC	901 New York Avenue	25.00	%	(2)	(12,150)		(12,493)
WP Project Developer LLC	Wisconsin Place Land and Infrastructure	33.33	%	(3)	31,398		31,971
500 North Capitol Venture LLC	500 North Capitol Street, NW	30.00	%		(8,559)		(9,185)
501 K Street LLC	1001 6th Street	50.00	%		43,443		42,922
Podium Developer LLC	The Hub on Causeway - Podium	50.00	%		44,542		46,839
Residential Tower Developer LLC	Hub50House	50.00	%		44,214		45,414
Hotel Tower Developer LLC	The Hub on Causeway - Hotel Air Rights	50.00	%		12,750		12,366
Office Tower Developer LLC	100 Causeway Street	50.00	%		59,550		59,716
1265 Main Office JV LLC	1265 Main Street	50.00	%		3,583		3,465
BNY Tower Holdings LLC	Dock 72	50.00	%	(4)	(13,511)		(19,921)
CA-Colorado Center, LLC	Colorado Center	50.00	%		235,846		233,862
7750 Wisconsin Avenue LLC	7750 Wisconsin Avenue	50.00	%		50,789		52,152
BP-M 3HB Venture LLC	3 Hudson Boulevard	25.00	%		115,878		116,397
SMBP Venture LP	Santa Monica Business Park	55.00	%		161,368		164,735
Platform 16 Holdings LP	Platform 16	55.00	%	(5)	184,642		158,109
Gateway Portfolio Holdings LLC	Gateway Commons	50.00	%		349,055		324,038
Rosecrans-Sepulveda Partners 4, LLC	Beach Cities Media Campus	50.00	%		27,013		27,000
Safeco Plaza REIT LLC	Safeco Plaza	33.67	%	(6)	70,331		69,785
360 PAS Holdco LLC	360 Park Avenue South	42.21	%	(7)	112,219		114,992
PR II/BXP Reston Gateway LLC	Reston Next Residential	20.00	%		11,796		11,351
751 Gateway Holdings LLC	751 Gateway	49.00	%		89,025		80,714
200 Fifth Avenue JV LLC	200 Fifth Avenue	26.69	%		116,335		120,083
ABXP Worldgate Investments LLC	13100 and 13150 Worldgate Drive	50.00	%		17,182		N/A
					$	1,703,032	$	1,630,485

 _______________

(1)Investments with deficit balances aggregating approximately $77.9 million and $85.4 million at June 30, 2023 and December 31, 2022, 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 June 30, 2023 and December 31, 2022, 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)This property includes net equity balances from the amenity joint venture.

(5)At December 31, 2022, this entity was a VIE.

(6)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.

(7)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.

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: 

	June 30, 2023		December 31, 2022
	(in thousands)
ASSETS
Real estate and development in process, net (1)	$	6,748,400	$	6,537,554
Other assets	779,220		756,786
Total assets	$	7,527,620	$	7,294,340
LIABILITIES AND MEMBERS’/PARTNERS’ EQUITY
Mortgage and notes payable, net	$	4,056,181	$	4,022,746
Other liabilities (2)	724,078		716,271
Members’/Partners’ equity	2,747,361		2,555,323
Total liabilities and members’/partners’ equity	$	7,527,620	$	7,294,340
Company’s share of equity	$	1,301,827	$	1,238,929
Basis differentials (3)	401,205		391,556
Carrying value of the Company’s investments in unconsolidated joint ventures (4)	$	1,703,032	$	1,630,485

_______________

(1)At June 30, 2023 and December 31, 2022, this amount included right of use assets - finance leases totaling approximately $248.9 million. At June 30, 2023 and December 31, 2022, this amount included right of use assets - operating leases totaling approximately $20.6 million and $21.2 million, respectively.

(2)At June 30, 2023 and December 31, 2022, this amount included lease liabilities - finance leases totaling approximately $379.7 million and $382.2 million, respectively. At June 30, 2023 and December 31, 2022, this amount included lease liabilities - operating leases totaling approximately $30.5 million.

(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:

	June 30, 2023		December 31, 2022
Property	(in thousands)
Colorado Center	$	300,370	$	301,820
200 Fifth Avenue	96,837		94,497
Gateway Commons	48,078		47,808
Dock 72	(97,232)		(98,980)

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 $77.9 million and $85.4 million at June 30, 2023 and December 31, 2022, 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 June 30,				Six months ended June 30,
	2023		2022		2023		2022
	(in thousands)
Total revenue (1)	$	164,771	$	120,871	$	316,194	$	245,362
Expenses
Operating	61,023		45,353		118,229		90,994
Transaction costs	27		811		101		811
Depreciation and amortization	51,233		43,293		101,211		87,957
Total expenses	112,283		89,457		219,541		179,762
Other income (expense)
Loss from early extinguishment of debt	(3)		—		(3)		(1,327)
Interest expense	(58,799)		(32,219)		(116,049)		(62,592)
Unrealized gain on derivative instruments	14,457		—		3,847		—
Net income (loss)	$	8,143	$	(805)	$	(15,552)	$	1,681
Company’s share of net income (loss)	$	639	$	1,082	$	(6,263)	$	4,476
Basis differential (2)	(7,307)		(1,136)		(7,974)		(2,341)
Income (loss) from unconsolidated joint ventures	$	(6,668)	$	(54)	$	(14,237)	$	2,135

_______________ 

(1)Includes straight-line rent adjustments of approximately $6.9 million and $17.8 million for the three months ended June 30, 2023 and 2022, respectively, and approximately $13.2 million and $45.3 million for the six months ended June 30, 2023 and 2022, respectively.

(2)Includes straight-line rent adjustments of approximately $0.4 million and $0.1 million for the three months ended June 30, 2023 and 2022, respectively, and approximately $0.7 million and $0.2 million for the six months ended June 30, 2023 and 2022, respectively. Also includes net above-/below-market rent adjustments of approximately $0.2 million and $0.1 million for the three months ended June 30, 2023 and 2022, respectively, and approximately $0.4 million and $0.2 million for the six months ended June 30, 2023 and 2022.

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Debt (Tables)

6 Months Ended

Jun. 30, 2023

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

The following summarizes the unsecured senior notes outstanding as of June 30, 2023 (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
5 Year Unsecured Senior Notes	6.750	%	6.924	%	750,000		December 1, 2027
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
10.7 Year Unsecured Senior Notes	6.500	%	6.619	%	750,000		January 15, 2034
Total principal					11,050,000
Less:
Net unamortized discount					14,831
Deferred financing costs, net					49,774
Total					$	10,985,395

_______________

(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.

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Derivative Instruments and Hedging Activities (Tables)

6 Months Ended

Jun. 30, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Interest Rate Derivatives

BPLP’s interest rate swap contracts consisted of the following at June 30, 2023 (dollars in thousands):

Derivative Instrument	Aggregate Notional Amount				Strike Rate Range					Balance Sheet Location
			Effective Date	Maturity Date	Low			High			Fair Value
Interest Rate Swaps	$	1,200,000	May 4, 2023	May 16, 2024	4.638	%	—	4.646	%	Prepaid expenses and other assets	$	6,445

Derivative Instruments, Gain (Loss)

The following table presents the location in the financial statements of the gains or losses recognized related to the Company’s cash flow hedges for the three and six months ended June 30, 2023 and 2022 (dollars in thousands):

	Three months ended June 30,				Six months ended June 30,
	2023		2022		2023		2022
Amount of gain (loss) related to the effective portion recognized in other comprehensive income (1)	$	14,965	$	35	$	8,427	$	7,600
Amount of gain (loss) related to the effective portion subsequently reclassified to earnings (2)	$	1,674	$	1,677	$	3,349	$	3,353
Amount of gain (loss) relate do the ineffective portion and amount excluded from effectiveness testing	$	—	$	—	$	—	$	—

_______________

(1)Includes the Company’s share of gain (loss) related to the effective portion of derivatives outstanding at its unconsolidated joint venture properties.

(2)Consists of amounts from previous interest rate programs.

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Noncontrolling Interests (Tables)

6 Months Ended

Jun. 30, 2023

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 2023 and during the six months ended June 30, 2022:

Record Date	Payment Date	Dividend (Per Share)	Distribution (Per Unit)
June 30, 2023	July 31, 2023	$0.98	$0.98
March 31, 2023	April 28, 2023	$0.98	$0.98
December 30, 2022	January 30, 2023	$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

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 - 2019 MYLTIP Units and, after the February 3, 2023 measurement date, the 2020 MYLTIP Units) and its distributions on the 2020 MYLTIP Units (prior to the February 3, 2023 measurement date) and 2021 - 2023 MYLTIP Units (after the February 7, 2023 issuance date of the 2023 MYLTIP Units) that occurred during the six months ended June 30, 2023:

Record Date	Payment Date	Distributions per OP Unit and LTIP Unit	Distributions per MYLTIP Unit
June 30, 2023	July 31, 2023	$0.98	$0.098
March 31, 2023	April 28, 2023	$0.98	$0.098
December 30, 2022	January 30, 2023	$0.98	$0.098

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 six months ended June 30, 2022:

Record Date	Payment Date	Distributions per OP Unit and LTIP Unit	Distributions per MYLTIP Unit
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

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Stockholders' Equity / Partners' Capital (Tables)

6 Months Ended

Jun. 30, 2023

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 2023 and during the six months ended June 30, 2022:

Record Date	Payment Date	Dividend (Per Share)	Distribution (Per Unit)
June 30, 2023	July 31, 2023	$0.98	$0.98
March 31, 2023	April 28, 2023	$0.98	$0.98
December 30, 2022	January 30, 2023	$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

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Segment Information (Tables)

6 Months Ended

Jun. 30, 2023

Segment Reporting [Abstract]

Schedule Of Reconciliation Of Net Operating Income To Net Income

BXP

	Three months ended June 30,				Six months ended June 30,
	2023		2022		2023		2022
	(in thousands)
Net income attributable to Boston Properties, Inc.	$	104,299	$	222,989	$	182,215	$	366,044
Add:
Noncontrolling interest—common units of the Operating Partnership	12,117		25,708		21,169		42,061
Noncontrolling interests in property partnerships	19,768		18,546		38,428		36,095
Interest expense	142,473		104,142		276,680		205,370
Net operating income from unconsolidated joint ventures	42,254		35,710		83,010		73,031
Depreciation and amortization expense	202,577		183,146		411,311		360,770
Transaction costs	308		496		1,219		496
Payroll and related costs from management services contracts	4,609		3,239		9,844		7,304
General and administrative expense	44,175		34,665		99,977		77,859
Less:
Net operating income attributable to noncontrolling interests in property partnerships	47,958		47,862		95,055		94,917
Unrealized gain on non-real estate investment	124		—		383		—
Gains (losses) from investments in securities	1,571		(4,716)		3,236		(6,978)
Other income - assignment fee	—		6,624		—		6,624
Interest and other income (loss)	17,343		1,195		28,284		2,423
Gains on sales of real estate	—		96,247		—		118,948
Income (loss) from unconsolidated joint ventures	(6,668)		(54)		(14,237)		2,135
Direct reimbursements of payroll and related costs from management services contracts	4,609		3,239		9,844		7,304
Development and management services revenue	9,858		6,354		18,838		12,185
Company’s share of Net Operating Income	$	497,785	$	471,890	$	982,450	$	931,472

BPLP

	Three months ended June 30,				Six months ended June 30,
	2023		2022		2023		2022
	(in thousands)
Net income attributable to Boston Properties Limited Partnership	$	118,098	$	253,788	$	206,928	$	415,617
Add:
Noncontrolling interests in property partnerships	19,768		18,546		38,428		36,095
Interest expense	142,473		104,142		276,680		205,370
Net operating income from unconsolidated joint ventures	42,254		35,710		83,010		73,031
Depreciation and amortization expense	200,895		181,416		407,767		357,302
Transaction costs	308		496		1,219		496
Payroll and related costs from management services contracts	4,609		3,239		9,844		7,304
General and administrative expense	44,175		34,665		99,977		77,859
Less:
Net operating income attributable to noncontrolling interests in property partnerships	47,958		47,862		95,055		94,917
Unrealized gain on non-real estate investment	124		—		383		—
Gains (losses) from investments in securities	1,571		(4,716)		3,236		(6,978)
Other income - assignment fee	—		6,624		—		6,624
Interest and other income (loss)	17,343		1,195		28,284		2,423
Gains on sales of real estate	—		99,608		—		122,992
Income (loss) from unconsolidated joint ventures	(6,668)		(54)		(14,237)		2,135
Direct reimbursements of payroll and related costs from management services contracts	4,609		3,239		9,844		7,304
Development and management services revenue	9,858		6,354		18,838		12,185
Company’s share of Net Operating Income	$	497,785	$	471,890	$	982,450	$	931,472

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 June 30, 2023:

	Boston			Los Angeles			New York			San Francisco			Seattle			Washington, DC			Total
Rental Revenue: (1)
Premier Workplace	$	269,464		$	—		$	262,979		$	136,241		$	17,060		$	90,720		$	776,464
Residential	4,124			—			—			3,864			—			4,265			12,253
Hotel	13,969			—			—			—			—			—			13,969
Total	287,557			—			262,979			140,105			17,060			94,985			802,686
% of Grand Totals	35.83		%	—		%	32.76		%	17.45		%	2.13		%	11.83		%	100.00		%
Rental Expenses:
Premier Workplace	95,597			—			102,948			48,197			3,082			35,429			285,253
Residential	1,601			—			—			2,215			—			1,967			5,783
Hotel	8,161			—			—			—			—			—			8,161
Total	105,359			—			102,948			50,412			3,082			37,396			299,197
% of Grand Totals	35.21		%	—		%	34.41		%	16.85		%	1.03		%	12.50		%	100.00		%
Net operating income	$	182,198		$	—		$	160,031		$	89,693		$	13,978		$	57,589		$	503,489
% of Grand Totals	36.19		%	—		%	31.78		%	17.81		%	2.78		%	11.44		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(11,343)			—			(36,615)			—			—			—			(47,958)
Add: Company’s share of net operating income from unconsolidated joint ventures	8,771			12,768			3,363			3,332			1,878			12,142			42,254
Company’s share of net operating income	$	179,626		$	12,768		$	126,779		$	93,025		$	15,856		$	69,731		$	497,785
% of Grand Totals	36.08		%	2.56		%	25.47		%	18.69		%	3.19		%	14.01		%	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 June 30, 2022:

	Boston			Los Angeles			New York			San Francisco			Seattle			Washington, DC			Total
Rental Revenue: (1)
Premier Workplace	$	244,936		$	—		$	254,264		$	133,707		$	6,472		$	95,954		$	735,333
Residential	3,748			—			—			5,850			—			7,314			16,912
Hotel	12,089			—			—			—			—			—			12,089
Total	260,773			—			254,264			139,557			6,472			103,268			764,334
% of Grand Totals	34.11		%	—		%	33.27		%	18.26		%	0.85		%	13.51		%	100.00		%
Rental Expenses:
Premier Workplace	87,027			—			95,363			45,201			1,680			34,759			264,030
Residential	1,492			—			—			5,145			—			3,181			9,818
Hotel	6,444			—			—			—			—			—			6,444
Total	94,963			—			95,363			50,346			1,680			37,940			280,292
% of Grand Totals	33.88		%	—		%	34.02		%	17.96		%	0.60		%	13.54		%	100.00		%
Net operating income	$	165,810		$	—		$	158,901		$	89,211		$	4,792		$	65,328		$	484,042
% of Grand Totals	34.25		%	—		%	32.83		%	18.43		%	0.99		%	13.50		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(11,377)			—			(36,485)			—			—			—			(47,862)
Add: Company’s share of net operating income (loss) from unconsolidated joint ventures	8,134			13,247			18			3,183			1,944			9,184			35,710
Company’s share of net operating income	$	162,567		$	13,247		$	122,434		$	92,394		$	6,736		$	74,512		$	471,890
% of Grand Totals	34.44		%	2.81		%	25.95		%	19.58		%	1.43		%	15.79		%	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 six months ended June 30, 2023:

	Boston			Los Angeles			New York			San Francisco			Seattle			Washington, DC			Total
Rental Revenue: (1)
Premier Workplace	$	539,415		$	—		$	521,171		$	272,334		$	31,318		$	181,384		$	1,545,622
Residential	8,173			—			—			7,506			—			8,300			23,979
Hotel	22,070			—			—			—			—			—			22,070
Total	569,658			—			521,171			279,840			31,318			189,684			1,591,671
% of Grand Totals	35.79		%	—		%	32.74		%	17.58		%	1.97		%	11.92		%	100.00		%
Rental Expenses:
Premier Workplace	195,646			—			205,433			94,282			6,042			69,695			571,098
Residential	3,153			—			—			4,388			—			3,705			11,246
Hotel	14,832			—			—			—			—			—			14,832
Total	213,631			—			205,433			98,670			6,042			73,400			597,176
% of Grand Totals	35.78		%	—		%	34.40		%	16.52		%	1.01		%	12.29		%	100.00		%
Net operating income	$	356,027		$	—		$	315,738		$	181,170		$	25,276		$	116,284		$	994,495
% of Grand Totals	35.80		%	—		%	31.75		%	18.22		%	2.54		%	11.69		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(22,160)			—			(72,895)			—			—			—			(95,055)
Add: Company’s share of net operating income (loss) from unconsolidated joint ventures	17,348			25,993			7,013			6,796			3,724			22,136			83,010
Company’s share of net operating income	$	351,215		$	25,993		$	249,856		$	187,966		$	29,000		$	138,420		$	982,450
% of Grand Totals	35.75		%	2.65		%	25.43		%	19.13		%	2.95		%	14.09		%	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 six months ended June 30, 2022:

	Boston			Los Angeles			New York			San Francisco			Seattle				Washington, DC			Total
Rental Revenue: (1)
Premier Workplace	$	487,014		$	—		$	511,134		$	266,082		$	6,472			$	191,519		$	1,462,221
Residential	7,344			—			—			8,241			—				14,293			29,878
Hotel	16,646			—			—			—			—				—			16,646
Total	511,004			—			511,134			274,323			6,472				205,812			1,508,745
% of Grand Totals	33.87		%	—		%	33.88		%	18.18		%	0.43		%		13.64		%	100.00		%
Rental Expenses:
Premier Workplace	177,555			—			191,703			88,609			1,680				68,306			527,853
Residential	2,929			—			—			7,013			—				6,308			16,250
Hotel	11,284			—			—			—			—				—			11,284
Total	191,768			—			191,703			95,622			1,680			—	74,614			555,387
% of Grand Totals	34.53		%	—		%	34.52		%	17.22		%	0.30		%		13.43		%	100.00		%
Net operating income	$	319,236		$	—		$	319,431		$	178,701		$	4,792			$	131,198		$	953,358
% of Grand Totals	33.49		%	—		%	33.51		%	18.74		%	0.50		%		13.76		%	100.00		%
Less: Net operating income attributable to noncontrolling interests in property partnerships	(23,112)			—			(71,805)			—			—				—			(94,917)
Add: Company’s share of net operating income (loss) from unconsolidated joint ventures	17,827			27,004			(138)			6,364			3,899				18,075			73,031
Company’s share of net operating income	$	313,951		$	27,004		$	247,488		$	185,065		$	8,691			$	149,273		$	931,472
% of Grand Totals	33.70		%	2.90		%	26.57		%	19.87		%	0.93		%		16.03		%	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)

6 Months Ended

Jun. 30, 2023

Entity Information [Line Items]

Computation Of Basic And Diluted Earnings Per Share / Unit

	Three months ended June 30, 2023
	Income (Numerator)		Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc.	$	104,299	156,826	$	0.67
Effect of Dilutive Securities:
Stock Based Compensation	—		392	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties, Inc.	$	104,299	157,218	$	0.66
	Three months ended June 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.	$	222,989	156,720	$	1.42
Allocation of undistributed earnings to participating securities	(267)		—	—
Net income attributable to Boston Properties, Inc.	222,722		156,720	1.42
Effect of Dilutive Securities:
Stock Based Compensation	—		472	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc.	$	222,722	157,192	$	1.42

	Six months ended June 30, 2023
	Income (Numerator)		Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc.	$	182,215	156,815	$	1.16
Effect of Dilutive Securities:
Stock Based Compensation	—		316	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc.	$	182,215	157,131	$	1.16

	Six months ended June 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.	$	366,044	156,685	$	2.33
Allocation of undistributed earnings to participating securities	(236)		—	—
Net income attributable to Boston Properties, Inc.	365,808		156,685	2.33
Effect of Dilutive Securities:
Stock Based Compensation	—		413	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc.	$	365,808	157,098	$	2.33

Boston Properties Limited Partnership

Entity Information [Line Items]

Computation Of Basic And Diluted Earnings Per Share / Unit

	Three months ended June 30, 2023
	Income (Numerator)		Units (Denominator)	Per Unit Amount
	(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership	$	118,098	174,748	$	0.68
Effect of Dilutive Securities:
Stock Based Compensation	—		392	(0.01)
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership	$	118,098	175,140	$	0.67

	Three months ended June 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	$	253,788	174,392	$	1.45
Allocation of undistributed earnings to participating securities	(297)		—	—
Net income attributable to Boston Properties Limited Partnership	253,491		174,392	1.45
Effect of Dilutive Securities:
Stock Based Compensation	—		472	—
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership	$	253,491	174,864	$	1.45

	Six months ended June 30, 2023
	Income (Numerator)		Units (Denominator)	Per Unit Amount
	(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership	$	206,928	174,693	$	1.18
Effect of Dilutive Securities:
Stock Based Compensation	—		316	—
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership	$	206,928	175,009	$	1.18
	Six months ended June 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	$	415,617	174,323	$	2.38
Allocation of undistributed earnings to participating securities	(263)		—	—
Net income attributable to Boston Properties Limited Partnership	415,354		174,323	2.38
Effect of Dilutive Securities:
Stock Based Compensation	—		413	—
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership	$	415,354	174,736	$	2.38

XML

Organization (Details) ft² in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2023 ft² Real_Estate_Properties yr shares	Dec. 31, 2022
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
2012 OPP Units and Vested MYLTIPs
Real Estate Properties [Line Items]
Vesting Period	3 years
Construction in Progress
Real Estate Properties [Line Items]
Number of real estate properties	13
Net Rentable Area (in sf) | ft²	3.1
Commercial Real Estate Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	191
Net Rentable Area (in sf) | ft²	54.1
Office and Life Sciences Building [Member]
Real Estate Properties [Line Items]
Number of real estate properties	170
Office and Life Sciences Building [Member] | Construction in Progress
Real Estate Properties [Line Items]
Number of real estate properties	10
Retail Site [Member]
Real Estate Properties [Line Items]
Number of real estate properties	14
Retail Site [Member] | Construction in Progress
Real Estate Properties [Line Items]
Number of real estate properties	2
Residential Building
Real Estate Properties [Line Items]
Number of real estate properties	6
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)	89.40%	89.60%

XML

Summary Of Significant Accounting Policies (Narrative) (Details) - Variable Interest Entity, Primary Beneficiary [Member]	Jun. 30, 2023
Summary Of Significant Accounting Policies [Line Items]
Number of VIEs	6
Commercial Real Estate Properties [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	Jun. 30, 2023	Dec. 31, 2022
Summary Of Significant Accounting Policies [Line Items]
Related party note receivable, net	$ 88,834	$ 78,576
Sales-type lease receivable, net	13,250	12,811
Mortgage notes payable, net	3,274,764	3,272,368
Unsecured senior notes, net	10,985,395	10,237,968
Unsecured line of credit	0	0
Unsecured term loan, net	1,196,046	730,000
Carrying Amount [Member]
Summary Of Significant Accounting Policies [Line Items]
Related party note receivable, net	88,834	78,576
Sales-type lease receivable, net	13,250	12,811
Total	102,084	91,387
Mortgage notes payable, net	3,274,764	3,272,368
Unsecured senior notes, net	10,985,395	10,237,968
Unsecured line of credit	0	0
Unsecured term loan, net	1,196,046	730,000
Total	15,456,205	14,240,336
Estimated Fair Value [Member]
Summary Of Significant Accounting Policies [Line Items]
Related party note receivable, net	90,500	79,220
Sales-type lease receivable, net	13,173	13,045
Total	103,673	92,265
Mortgage notes payable, net	2,765,657	2,744,479
Unsecured senior notes, net	9,751,688	9,135,512
Unsecured line of credit	0	0
Unsecured term loan, net	1,194,895	730,000
Total	$ 13,712,240	$ 12,609,991

XML

Summary Of Significant Accounting Policies Fair Value of Derivatives (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Interest Rate Swap
Derivatives, Fair Value [Line Items]
Interest rate swaps	$ 6,445	$ 0

XML

Real Estate Schedule of Real Estate Properties (Details) - USD ($) $ in Thousands		Jun. 30, 2023	Dec. 31, 2022
Real Estate Properties [Line Items]
Land		$ 5,189,287	$ 5,189,811
Right-of-use assets - finance leases		237,526	237,510
Right of use assets - operating leases		166,421	167,351
Land held for future development	[1]	637,191	721,501
Buildings and improvements		16,054,447	15,820,724
Tenant improvements		3,345,766	3,200,743
Furniture, Fixtures and Equipment		53,181	50,310
Construction in progress		482,850	406,574
Total		26,166,669	25,794,524
Less: accumulated depreciation		(6,568,568)	(6,298,082)
Total real estate		19,598,101	19,496,442
Boston Properties Limited Partnership
Real Estate Properties [Line Items]
Land		5,094,578	5,095,102
Right-of-use assets - finance leases		237,526	237,510
Right of use assets - operating leases		166,421	167,351
Land held for future development	[1]	637,191	721,501
Buildings and improvements		15,782,891	15,547,919
Tenant improvements		3,345,766	3,200,743
Furniture, Fixtures and Equipment		53,181	50,310
Construction in progress		482,850	406,574
Total		25,800,404	25,427,010
Less: accumulated depreciation		(6,448,665)	(6,180,474)
Total real estate		$ 19,351,739	$ 19,246,536

[1] Includes pre-development costs.

XML

Real Estate (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) ft²	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) ft²	Jun. 30, 2022 USD ($)	Jun. 01, 2023 ft²	Apr. 29, 2023 ft²	Jan. 30, 2023 ft²	Jan. 05, 2023 ft²
Real Estate Properties [Line Items]
Depreciation and amortization | $	$ 202,577	$ 183,146	$ 411,311	$ 360,770
Construction in Progress
Real Estate Properties [Line Items]
Net Rentable Area (in sf)	3,100,000		3,100,000
290 Binney
Real Estate Properties [Line Items]
Net Rentable Area (in sf)								566,000
Leased percentage								100.00%
300 Binney Street
Real Estate Properties [Line Items]
Net Rentable Area (in sf)							195,000
Depreciation and amortization | $			$ 11,000
300 Binney Street | Construction in Progress
Real Estate Properties [Line Items]
Net Rentable Area (in sf)							236,000
Leased percentage							100.00%
2100 Pennsylvania Avenue
Real Estate Properties [Line Items]
Net Rentable Area (in sf)						476,000
View Boston
Real Estate Properties [Line Items]
Net Rentable Area (in sf)					63,000

XML

Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Leases [Abstract]
Fixed contractual payments	$ 629,189	$ 601,351	$ 1,250,835	$ 1,200,958
Variable lease payments	132,315	120,548	267,318	239,061
Sales-type lease income	229	0	455	0
Lease	$ 761,733	$ 721,899	$ 1,518,608	$ 1,440,019

XML

Investments in Unconsolidated Joint Ventures (Investments in Unconsolidated Joint Ventures) (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Other Liabilities		$ (418,813)	$ (450,918)
Investments in unconsolidated joint ventures		1,780,959	1,715,911
Investments In Affiliates Subsidiaries Associates And Joint Ventures net	[1]	1,703,032	1,630,485
Unconsolidated Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Other Liabilities		$ (77,900)	(85,400)
Square 407 Limited Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Properties		Market Square North
Ownership Percentage		50.00%
Other Liabilities	[1]	$ (6,053)	(6,198)
BP/CRF Metropolitan Square LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		Metropolitan Square
Ownership Percentage		20.00%
Other Liabilities	[1]	$ (37,654)	(37,629)
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]	$ (12,150)	$ (12,493)
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]	$ 31,398	$ 31,971
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]	$ (8,559)	(9,185)
501 K Street LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		1001 6th Street
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 43,443	42,922
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]	$ 44,542	46,839
Residential Tower Developer LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		Hub50House
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 44,214	45,414
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]	$ 12,750	12,366
Office Tower Developer LLC
Schedule of Equity Method Investments [Line Items]
Properties		100 Causeway Street
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 59,550	59,716
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]	$ 3,583	3,465
BNY Tower Holdings LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		Dock 72
Ownership Percentage	[4]	50.00%
Other Liabilities	[1]	$ (13,511)	(19,921)
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]	$ 235,846	233,862
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]	$ 50,789	52,152
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]	$ 115,878	116,397
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]	$ 161,368	164,735
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]	$ 184,642	158,109
Gateway Portfolio Holdings LLC [Member]
Schedule of Equity Method Investments [Line Items]
Properties		Gateway Commons
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 349,055	324,038
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]	$ 27,013	27,000
Safeco Plaza REIT LLC
Schedule of Equity Method Investments [Line Items]
Properties		Safeco Plaza
Ownership Percentage	[6]	33.67%
Investments in unconsolidated joint ventures	[1]	$ 70,331	69,785
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	[7]	42.21%
Investments in unconsolidated joint ventures	[1]	$ 112,219	114,992
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%
PR II BXP Reston Gateway LLC
Schedule of Equity Method Investments [Line Items]
Properties		Reston Next Residential
Ownership Percentage		20.00%
Investments in unconsolidated joint ventures	[1]	$ 11,796	11,351
751 Gateway Holdings LLC
Schedule of Equity Method Investments [Line Items]
Properties		751 Gateway
Ownership Percentage		49.00%
Investments in unconsolidated joint ventures	[1]	$ 89,025	80,714
200 Fifth Avenue JV LLC
Schedule of Equity Method Investments [Line Items]
Properties		200 Fifth Avenue
Ownership Percentage		26.69%
Investments in unconsolidated joint ventures	[1]	$ 116,335	$ 120,083
ABXP Worldgate Investments LLC
Schedule of Equity Method Investments [Line Items]
Properties		13100 and 13150 Worldgate Drive
Ownership Percentage		50.00%
Investments in unconsolidated joint ventures	[1]	$ 17,182
Entity Owning Land And Infrastructure Of Project [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		33.33%
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 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%
360 PAS Holdco LLC (indirect ownership) | Company's Share [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		5.837%

[1] Investments with deficit balances aggregating approximately $77.9 million and $85.4 million at June 30, 2023 and December 31, 2022, 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 June 30, 2023 and December 31, 2022, 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] This property includes net equity balances from the amenity joint venture.

[5] At December 31, 2022, this entity was a VIE.

[6] 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.

[7] 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.

XML

Investments in Unconsolidated Joint Ventures (Balance Sheets of the Unconsolidated Joint Ventures) (Details) - USD ($) $ in Thousands		Jun. 30, 2023	Dec. 31, 2022
ASSETS
Total real estate		$ 19,598,101	$ 19,496,442
Total assets		25,341,680	24,207,669
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Mortgage and notes payable, net		3,274,764	3,272,368
Other Liabilities		418,813	450,918
Members’/Partners’ equity		6,040,052	6,132,919
Total liabilities and equity / capital		25,341,680	24,207,669
Carying value of the Company's investment in unconsolidated joint ventures		1,780,959	1,715,911
Right-of-use assets - finance leases		237,526	237,510
Right of use assets - operating leases		166,421	167,351
Lease liabilities - finance leases		251,874	249,335
Lease liabilities - operating leases		204,826	204,686
Unconsolidated Joint Ventures [Member]
ASSETS
Total real estate	[1]	6,748,400	6,537,554
Other assets		779,220	756,786
Total assets		7,527,620	7,294,340
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Mortgage and notes payable, net		4,056,181	4,022,746
Other Liabilities	[2]	724,078	716,271
Members’/Partners’ equity		2,747,361	2,555,323
Total liabilities and equity / capital		7,527,620	7,294,340
Company's share of equity		1,301,827	1,238,929
Basis differentials	[3]	401,205	391,556
Carying value of the Company's investment in unconsolidated joint ventures	[4]	1,703,032	1,630,485
Right-of-use assets - finance leases		248,900	248,900
Right of use assets - operating leases		20,600	21,200
Lease liabilities - finance leases		379,700	382,200
Lease liabilities - operating leases		30,500	30,500
Unconsolidated Joint Ventures [Member]
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Other Liabilities		77,900	85,400
Colorado Center
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Basis differentials		300,370	301,820
Carying value of the Company's investment in unconsolidated joint ventures	[5]	235,846	233,862
200 Fifth Avenue JV LLC
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Basis differentials		96,837	94,497
Carying value of the Company's investment in unconsolidated joint ventures	[5]	116,335	120,083
Gateway Commons Complex [Member]
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Basis differentials		48,078	47,808
Carying value of the Company's investment in unconsolidated joint ventures	[5]	349,055	324,038
Dock 72
LIABILITIES AND MEMBERS'/PARTNERS' EQUITY
Other Liabilities	[5]	13,511	19,921
Basis differentials		$ (97,232)	$ (98,980)

[1] At June 30, 2023 and December 31, 2022, this amount included right of use assets - finance leases totaling approximately $248.9 million. At June 30, 2023 and December 31, 2022, this amount included right of use assets - operating leases totaling approximately $20.6 million and $21.2 million, respectively.

[2] At June 30, 2023 and December 31, 2022, this amount included lease liabilities - finance leases totaling approximately $379.7 million and $382.2 million, respectively. At June 30, 2023 and December 31, 2022, this amount included lease liabilities - operating leases totaling approximately $30.5 million.

[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: June 30, 2023December 31, 2022Property(in thousands)Colorado Center$300,370 $301,820 200 Fifth Avenue96,837 94,497 Gateway Commons48,078 47,808 Dock 72(97,232)(98,980) 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 $77.9 million and $85.4 million at June 30, 2023 and December 31, 2022, respectively, are reflected within Other Liabilities in the Company’s Consolidated Balance Sheets.

[5] Investments with deficit balances aggregating approximately $77.9 million and $85.4 million at June 30, 2023 and December 31, 2022, respectively, are included within Other Liabilities in the Company’s Consolidated Balance Sheets.

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Investments in Unconsolidated Joint Ventures (Statements of Operations of the Joint Ventures) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Schedule of Equity Method Investments [Line Items]
Total revenue		$ 817,153	$ 773,927	$ 1,620,353	$ 1,528,234
Expenses
Transaction costs		308	496	1,219	496
Depreciation and amortization		202,577	183,146	411,311	360,770
Total expenses		550,866	501,838	1,119,527	1,001,816
Other income (expense)
Interest expense		(142,473)	(104,142)	(276,680)	(205,370)
Gains on sales of real estate		0	96,247	0	118,948
Net income		136,184	267,243	241,812	444,200
Income (Loss) from Equity Method Investments		(6,668)	(54)	(14,237)	2,135
Unconsolidated Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Total revenue	[1]	164,771	120,871	316,194	245,362
Expenses
Operating		61,023	45,353	118,229	90,994
Transaction costs		27	811	101	811
Depreciation and amortization		51,233	43,293	101,211	87,957
Total expenses		112,283	89,457	219,541	179,762
Other income (expense)
Losses from early extinguishment of debt		(3)	0	(3)	(1,327)
Interest expense		(58,799)	(32,219)	(116,049)	(62,592)
Unrealized gain on derivative instruments		14,457	0	(3,847)	0
Net income		8,143	(805)	(15,552)	1,681
Company's share of net income (loss)		639	1,082	(6,263)	4,476
Basis differential	[2]	(7,307)	(1,136)	(7,974)	(2,341)
Income (Loss) from Equity Method Investments		(6,668)	(54)	(14,237)	2,135
Straight Line Rent Adjustments		6,900	17,800	13,200	45,300
Above and below market rent adjustments, net		200	100	400	200
Colorado Center [Member] | Unconsolidated Joint Ventures [Member]
Other income (expense)
Straight Line Rent Adjustments		$ 400	$ 100	$ 700	$ 200

[1] Includes straight-line rent adjustments of approximately $6.9 million and $17.8 million for the three months ended June 30, 2023 and 2022, respectively, and approximately $13.2 million and $45.3 million for the six months ended June 30, 2023 and 2022, respectively.

[2] Includes straight-line rent adjustments of approximately $0.4 million and $0.1 million for the three months ended June 30, 2023 and 2022, respectively, and approximately $0.7 million and $0.2 million for the six months ended June 30, 2023 and 2022, respectively. Also includes net above-/below-market rent adjustments of approximately $0.2 million and $0.1 million for the three months ended June 30, 2023 and 2022, respectively, and approximately $0.4 million and $0.2 million for the six months ended June 30, 2023 and 2022.

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Investment in Unconsolidated Joint Ventures (Narrative) (Details) $ in Thousands								3 Months Ended		6 Months Ended		59 Months Ended
	Jul. 07, 2023	Jun. 28, 2023	Jun. 27, 2023 USD ($)	Jun. 02, 2023	Apr. 21, 2023 ft² Year	Apr. 20, 2023 USD ($)	Jan. 31, 2023 USD ($) ft² a Vehicles Building	Jun. 30, 2023 USD ($) ft²	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) ft²	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) ft²	Jun. 05, 2023 USD ($) ft²	Jun. 04, 2023 USD ($)	Dec. 31, 2022 USD ($)
Schedule of Equity Method Investments [Line Items]
Interest and Other Income								$ 17,343	$ 1,195	$ 28,284	$ 2,423
Related party note receivable								$ 88,834		$ 88,834		$ 88,834			$ 78,576
3 Hudson Boulevard [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage								25.00%		25.00%		25.00%
Interest and Other Income												$ 23,200
Worldgate Drive | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage							50.00%
Payments to Acquire Interest in Joint Venture							$ 17,000
Net Rentable Area (in sf) | ft²							350,000
Number of buildings | Building							2
Number of parking space | Vehicles							1,200
Area of Land | a							10
7750 Wisconsin Avenue [Member] | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage					50.00%
Net Rentable Area (in sf) | ft²					734,000
Construction Loan						$ 252,600
Debt Instrument, Description of Variable Rate Basis				Term Secured Overnight Finance Rate (“SOFR”)	LIBOR	London interbank offered rate (“LIBOR”)
Extension Option (in years)					1	1
Number of extensions						2
7750 Wisconsin Avenue [Member] | Unconsolidated Properties | London Interbank Offered Rate (LIBOR)
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Basis Spread on Variable Rate					1.25%	1.25%
7750 Wisconsin Avenue [Member] | Unconsolidated Properties | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Basis Spread on Variable Rate				1.35%
500 North Capitol Street, NW | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage													30.00%
Net Rentable Area (in sf) | ft²													231,000
Debt													$ 105,000	$ 105,000
Debt, Weighted Average Interest Rate													6.83%
500 North Capitol Street, NW | Unconsolidated Properties | Company's Share [Member]
Schedule of Equity Method Investments [Line Items]
Related party note receivable													$ 10,500
3 Hudson Boulevard [Member] | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage		25.00%
Debt Instrument, Description of Variable Rate Basis		LIBOR	LIBOR
Debt Instrument, Basis Spread on Variable Rate		3.50%	3.50%
Debt			$ 80,000
Number of extensions		1	2
Extension Option (in days)			30 days
Extension Option Two (in days)		180 days	180 days
3 Hudson Boulevard [Member] | Unconsolidated Properties | Subsequent Event [Member]
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Description of Variable Rate Basis	Term SOFR
Debt Instrument, Basis Spread on Variable Rate	3.61%
3 Hudson Boulevard [Member] | Unconsolidated Properties | Extended Maturity
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Term		30 days
Platform 16 | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Ownership Percentage								55.00%		55.00%		55.00%
Net Rentable Area (in sf) | ft²								390,000		390,000		390,000

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Schedule of Unsecured Senior Notes (Details) - USD ($) $ in Thousands		Jun. 30, 2023		May 15, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Senior Notes		$ 10,985,395			$ 10,237,968
Boston Properties Limited Partnership
Debt Instrument [Line Items]
Senior Notes		10,985,395			$ 10,237,968
Boston Properties Limited Partnership | Senior Notes
Debt Instrument [Line Items]
Debt		11,050,000
Debt Instrument, Unamortized Discount		14,831
Debt Issuance Costs, Net		$ 49,774
Boston Properties Limited Partnership | Senior Notes | 3.279% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.125%
Debt Instrument, Interest Rate, Effective Percentage	[1]	3.279%
Debt		$ 500,000
Long-term Debt, Maturity Date	[2]	Sep. 01, 2023
Boston Properties Limited Partnership | Senior Notes | 3.916% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.80%
Debt Instrument, Interest Rate, Effective Percentage	[1]	3.916%
Debt		$ 700,000
Long-term Debt, Maturity Date	[2]	Feb. 01, 2024
Boston Properties Limited Partnership | Senior Notes | 3.350% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.20%
Debt Instrument, Interest Rate, Effective Percentage	[1]	3.35%
Debt		$ 850,000
Long-term Debt, Maturity Date	[2]	Jan. 15, 2025
Boston Properties Limited Partnership | Senior Notes | 3.766% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.65%
Debt Instrument, Interest Rate, Effective Percentage	[1]	3.766%
Debt		$ 1,000,000
Long-term Debt, Maturity Date	[2]	Feb. 01, 2026
Boston Properties Limited Partnership | Senior Notes | 3.495% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.75%
Debt Instrument, Interest Rate, Effective Percentage	[1]	3.495%
Debt		$ 1,000,000
Long-term Debt, Maturity Date	[2]	Oct. 01, 2026
Boston Properties Limited Partnership | Senior Notes | 6.924% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.75%
Debt Instrument, Interest Rate, Effective Percentage	[1]	6.924%
Debt		$ 750,000
Long-term Debt, Maturity Date	[2]	Dec. 01, 2027
Boston Properties Limited Partnership | Senior Notes | 4.628% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.50%
Debt Instrument, Interest Rate, Effective Percentage	[1]	4.628%
Debt		$ 1,000,000
Long-term Debt, Maturity Date	[2]	Dec. 01, 2028
Boston Properties Limited Partnership | Senior Notes | 3.505% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.40%
Debt Instrument, Interest Rate, Effective Percentage	[1]	3.505%
Debt		$ 850,000
Long-term Debt, Maturity Date	[2]	Jun. 21, 2029
Boston Properties Limited Partnership | Senior Notes | 2.984% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.90%
Debt Instrument, Interest Rate, Effective Percentage	[1]	2.984%
Debt		$ 700,000
Long-term Debt, Maturity Date	[2]	Mar. 15, 2030
Boston Properties Limited Partnership | Senior Notes | 3.343 % unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.25%
Debt Instrument, Interest Rate, Effective Percentage	[1]	3.343%
Debt		$ 1,250,000
Long-term Debt, Maturity Date	[2]	Jan. 30, 2031
Boston Properties Limited Partnership | Senior Notes | 2.671% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.55%
Debt Instrument, Interest Rate, Effective Percentage	[1]	2.671%
Debt		$ 850,000
Long-term Debt, Maturity Date	[2]	Apr. 01, 2032
Boston Properties Limited Partnership | Senior Notes | 2.524% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.45%
Debt Instrument, Interest Rate, Effective Percentage	[1]	2.524%
Debt		$ 850,000
Long-term Debt, Maturity Date	[2]	Oct. 01, 2033
Boston Properties Limited Partnership | Senior Notes | 6.619% unsecured senior notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.50%		6.50%
Debt Instrument, Interest Rate, Effective Percentage		6.619%	[1]	6.619%
Debt		$ 750,000		$ 750,000
Long-term Debt, Maturity Date	[2]	Jan. 15, 2034

[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.

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Unsecured Senior Notes (Narrative) (Details) - USD ($) $ in Thousands		6 Months Ended
	May 15, 2023	Jun. 30, 2023		Jun. 30, 2022
Debt Instrument [Line Items]
Proceeds from unsecured senior notes		$ 747,727		$ 0
Boston Properties Limited Partnership
Debt Instrument [Line Items]
Proceeds from unsecured senior notes		747,727		$ 0
Senior Notes | Boston Properties Limited Partnership
Debt Instrument [Line Items]
Debt		$ 11,050,000
Debt Instrument, Covenant Description		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.
Leverage ratio		60.00%
Secured debt leverage ratio - maximum		50.00%
Interest Coverage - Minimum		1.50
Unencumbered Asset Value - Minimum		150.00%
Debt Instrument, Covenant Compliance		At June 30, 2023, BPLP was in compliance with each of these financial restrictions and requirements.
6.619% unsecured senior notes | Senior Notes | Boston Properties Limited Partnership
Debt Instrument [Line Items]
Debt	$ 750,000	$ 750,000
Debt Instrument, Interest Rate, Stated Percentage	6.50%	6.50%
Senior Notes Pricing	99.697%
Debt Instrument, Interest Rate, Effective Percentage	6.619%	6.619%	[1]
Proceeds from unsecured senior notes	$ 741,300

[1] Yield on issuance date including the effects of discounts on the notes, settlements of interest rate contracts and the amortization of financing costs.

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Unsecured Credit Facility (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Jun. 01, 2023	Jun. 15, 2021	Dec. 31, 2022
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date			Jun. 15, 2026
Line of Credit Facility, Interest Rate Reduction			0.01%
Line of credit facility, maximum percent for loan advances			65.00%
Line of Credit Facility, Commitment Fee Percentage	0.15%
Debt Instrument, Alternate Basis Spread on Variable Rate	0.00%
Long-term Line of Credit	$ 0			$ 0
Maximum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Commitment Fee Percentage			0.30%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			1.40%
Minimum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Commitment Fee Percentage			0.10%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.70%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.775%
Line of Credit Facility, Maximum Borrowing Capacity			$ 1,500,000
Line of Credit, Additional Borrowing Capacity			$ 500,000
Line of Credit Facility, Interest Rate Description			At BPLP’s option, loans under the 2021 Credit Facility will bear interest at a rate per annum equal to (1) (a) in the case of loans denominated in Dollars, Term SOFR and SOFR, (b) in the case of loans denominated in Euro, EURIBOR, (c) in the case of loans denominated in Canadian Dollars, CDOR, and (d) in the case of loans denominated in Sterling, SONIA, in each case, plus a margin ranging from 70.0 to 140.0 basis points based on BPLP’s credit rating or (2) an alternate base rate equal to the greatest 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%, in each case, plus a margin ranging from 0 to 40 basis points based on BPLP’s credit rating.
Long-term Line of Credit	$ 0
Revolving Credit Facility [Member] | Base Rate [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.10%

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Unsecured Term Loan (Details) $ in Thousands	Jun. 30, 2023 USD ($)	Jan. 04, 2023 USD ($) mo Rate	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Unsecured term loan | $	$ 1,196,046		$ 730,000
2022 Unsecured Term Loan
Debt Instrument [Line Items]
Repayments of Unsecured Debt | $		$ 730,000
Payment for Debt Extinguishment or Debt Prepayment Cost | $		0
2023 Unsecured Term Loan
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | $		1,200,000
Line of Credit, Additional Borrowing Capacity | $		$ 300,000
Debt Instrument, Maturity Date		May 16, 2024
Number of extensions		1
Extension Option (in months) | mo		12
Proceeds from Unsecured Lines of Credit | $		$ 1,200,000
Debt Instrument, Basis Spread on Variable Rate | Rate		1.00%
Debt Instrument, Interest Rate Terms		At BPLP’s option, loans under the 2023 Unsecured Term Loan will bear interest at a rate per annum equal to (1) a base rate equal to the greatest of (a) the Federal Funds rate plus 0.5%, (b) the administrative agent’s prime rate, (c) Term SOFR for a one-month period plus 1.00%, and (d) 1.00%, in each case, plus a margin ranging from 0 to 60 basis points based on BPLP’s credit rating; or (2) a rate equal to adjusted Term SOFR with a one-month period plus a margin ranging from 75 to 160 basis points based on BPLP’s credit rating. Based on BPLP’s credit rating upon entry into the credit agreement, the base rate margin is 0 basis points and the Term SOFR margin is 0.85%.
Unsecured term loan | $	$ 1,200,000
2023 Unsecured Term Loan | Minimum [Member]
Debt Instrument [Line Items]
Number of Additional Term Loans		1
2023 Unsecured Term Loan | Fed Funds Effective Rate Overnight Index Swap Rate
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate | Rate		0.50%
2023 Unsecured Term Loan | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate | Rate		1.00%
2023 Unsecured Term Loan | Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.00%
2023 Unsecured Term Loan | Base Rate [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate | Rate		0.60%
2023 Unsecured Term Loan | Base Rate [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate | Rate		0.00%
2023 Unsecured Term Loan | Adjusted Term Secured Overnight Financing Rate (Adjusted Term SOFR)
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.85%	0.85%
2023 Unsecured Term Loan | Adjusted Term Secured Overnight Financing Rate (Adjusted Term SOFR) | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate | Rate		1.60%
2023 Unsecured Term Loan | Adjusted Term Secured Overnight Financing Rate (Adjusted Term SOFR) | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate | Rate		0.75%

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2021 Credit Facility and 2023 Unsecured Term Loan Compliance (Details) - 2021 Credit Facility and 2023 Unsecured Term Loan [Member]	6 Months Ended
	Jun. 30, 2023
Debt Instrument [Line Items]
Debt Instrument, Covenant Description	Among other covenants, the 2021 Credit Facility and the 2023 Unsecured Term Loan require 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.
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
Debt Instrument, Covenant Compliance	At June 30, 2023, BPLP was in compliance with each of these financial and other covenant requirements.

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Derivative Instruments and Hedging Activities (Details) - Interest Rate Swap - USD ($) $ in Thousands		3 Months Ended
	May 02, 2023	Jun. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Derivative, Swap Type		Interest Rate Swaps
Derivative, Notional Amount	$ 1,200,000	$ 1,200,000
Derivative, Maturity Date	May 16, 2024	May 16, 2024
Fair Value Hedge Assets		$ 6,445	$ 0
Minimum [Member]
Derivative [Line Items]
Derivative, Fixed Interest Rate		4.638%
Maximum [Member]
Derivative [Line Items]
Derivative, Fixed Interest Rate		4.646%

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Derivative Instruments and Hedging Activities (Narrative) (Details) $ in Thousands		2 Months Ended	3 Months Ended		6 Months Ended
	May 02, 2023 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)
Derivative [Line Items]
Interest Expense			$ 142,473	$ 104,142	$ 276,680	$ 205,370
Interest Rate Swap
Derivative [Line Items]
Derivative, Inception Date	May 02, 2023
Derivative, Notional Amount	$ 1,200,000	$ 1,200,000	$ 1,200,000		$ 1,200,000
Derivative, Average Fixed Interest Rate	4.642%
Derivative, Maturity Date	May 16, 2024		May 16, 2024
Derivative, Number of Instruments Held	4
Interest Expense		$ (900)

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Derivative Instruments and Hedging Activities Gain (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	[1]	$ 14,965	$ 35	$ 8,427	$ 7,600
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion	[2]	1,674	1,677	3,349	3,353
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net		$ 0	$ 0	$ 0	$ 0

[1] Includes the Company’s share of gain (loss) related to the effective portion of derivatives outstanding at its unconsolidated joint venture properties.

[2] Consists of amounts from previous interest rate programs.

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Commitments And Contingencies (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2023 USD ($) ft² Real_Estate_Properties
Commitments And Contingencies [Line Items]
Letter of credit and performance obligations	$ 21,600
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	5.00%
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%
Boston Properties Limited Partnership
Commitments And Contingencies [Line Items]
Operating partnership guarantee to cover liabilities of IXP	$ 20,000
767 Venture, LLC [Member]
Commitments And Contingencies [Line Items]
Maximum funding obligation	11,200
Property insurance program per occurrence limits	1,625,000
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
Residential Properties [Member] | Scenario, Plan
Commitments And Contingencies [Line Items]
Net Rentable Area (in sf) | ft²	400,000
Office and Life Sciences Building [Member]
Commitments And Contingencies [Line Items]
Number of real estate properties | Real_Estate_Properties	170
Office and Life Sciences Building [Member] | Scenario, Plan
Commitments And Contingencies [Line Items]
Net Rentable Area (in sf) | ft²	1,100,000
Number of real estate properties	2

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Noncontrolling Interests (Narrative) (Details) - Boston Properties Limited Partnership	Jun. 30, 2023 shares
OP Units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding	16,522,540
LTIP Units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding	2,135,852
2012 OPP and 2013-2020 MYLTIP [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding	514,715
MYLTIP 2021
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding	349,267
MYLTIP 2022
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding	252,151
MYLTIP 2023
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding	322,053

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(Common Units) (Narrative) (Details) $ / shares in Units, $ in Thousands			6 Months Ended
	Feb. 07, 2023 USD ($)	Feb. 03, 2023 USD ($) shares	Jun. 30, 2023 USD ($) yr $ / shares shares	Dec. 31, 2022 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 | $			$ 1,135,053	$ 1,280,886
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 2021 | Boston Properties Limited Partnership
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding			349,267
MYLTIP 2020 [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Final awards percentage of target		50.00%
Value of MYLTIP Awards | $		$ 3,800
Forfeitures, in units		152,460
MYLTIP 2022 | Boston Properties Limited Partnership
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding			252,151
MYLTIP 2023
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Vesting Period	3 years
Value of MYLTIP Awards | $	$ 13,100
MYLTIP 2023 | Boston Properties Limited Partnership
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Outstanding			322,053
OP Units [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
OP Units for redemption (in shares)			21,346
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 | $			$ 1,100,000
Closing price of common stock (in dollars per share) | $ / shares			$ 57.59
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)			21,346

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Noncontrolling Interests Common Units Distributions (Details) - $ / shares	Apr. 28, 2023	Jan. 30, 2023	Jul. 29, 2022	Apr. 29, 2022	Jan. 28, 2022	Jun. 20, 2023
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
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
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
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

XML

Noncontrolling Interests (Property Partnerships) (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Noncontrolling Interest [Line Items]
Noncontrolling Interest in Limited Partnerships	$ 1,557,368	$ 1,547,317

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Stockholders' Equity / Partners' Capital Narrative (Details) $ in Millions		6 Months Ended
	May 17, 2023 USD ($) yr	Jun. 30, 2023 shares	Dec. 31, 2022 shares	May 22, 2020 USD ($)
Class of Stock [Line Items]
Common Stock, Shares, Outstanding		156,853,400	156,757,867
General Partners' Capital Account, Units Outstanding (in units)		1,755,118
Limited Partners' Capital Account, Units Outstanding (in units)		155,098,282
Options exercised		0
Shares of Common Stock issued in connection with redemption of an equal number of OP Units (in shares)		21,346
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period		103,641
Outstanding options		0
ATM Program [Member]
Class of Stock [Line Items]
At The Market Stock Offering Program Aggregate Value Of Common Stock | $	$ 600.0			$ 600.0
At Market Stock Offering Program Maximum Length Of Sale (in years) | yr	3

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Stockholders' Equity / Partners' Capital Dividends / Distributions (Details) - $ / shares	Apr. 28, 2023	Jan. 30, 2023	Jul. 29, 2022	Apr. 29, 2022	Jan. 28, 2022	Jun. 20, 2023
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
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
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
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

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Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the Company	$ 104,299	$ 222,989	$ 182,215	$ 366,044
Noncontrolling interest-common units of the Operating Partnership	(12,117)	(25,708)	(21,169)	(42,061)
Noncontrolling interest in property partnerships	(19,768)	(18,546)	(38,428)	(36,095)
Interest expense	(142,473)	(104,142)	(276,680)	(205,370)
Company's share of net operating income from joint ventures	(503,489)	(484,042)	(994,495)	(953,358)
Depreciation and amortization expense	(202,577)	(183,146)	(411,311)	(360,770)
Transaction costs	(308)	(496)	(1,219)	(496)
General and administrative expense	(44,175)	(34,665)	(99,977)	(77,859)
Unrealized Gain (Loss) on Investments	(124)	0	(383)	0
Gains (losses) from investments in securities	(1,571)	4,716	(3,236)	6,978
Interest and other income (loss)	(17,343)	(1,195)	(28,284)	(2,423)
Gains on sales of real estate	0	(96,247)	0	(118,948)
Income (loss) from unconsolidated joint ventures	6,668	54	14,237	(2,135)
Other Income - assignment fee	0	(6,624)	0	(6,624)
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the Company	104,299	222,989	182,215	366,044
Noncontrolling interest-common units of the Operating Partnership	12,117	25,708	21,169	42,061
Noncontrolling interest in property partnerships	19,768	18,546	38,428	36,095
Interest expense	142,473	104,142	276,680	205,370
Depreciation and amortization expense	202,577	183,146	411,311	360,770
Transaction costs	308	496	1,219	496
Operating expense	4,609	3,239	9,844	7,304
General and administrative expense	44,175	34,665	99,977	77,859
Unrealized Gain (Loss) on Investments	124	0	383	0
Gains (losses) from investments in securities	1,571	(4,716)	3,236	(6,978)
Interest and other income (loss)	17,343	1,195	28,284	2,423
Gains on sales of real estate	0	96,247	0	118,948
Income (loss) from unconsolidated joint ventures	(6,668)	(54)	(14,237)	2,135
Other Income - assignment fee	0	6,624	0	6,624
Other revenue	4,609	3,239	9,844	7,304
Company's share of Net Operating Income	497,785	471,890	982,450	931,472
Unconsolidated Joint Ventures [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest expense	(58,799)	(32,219)	(116,049)	(62,592)
Depreciation and amortization expense	(51,233)	(43,293)	(101,211)	(87,957)
Transaction costs	(27)	(811)	(101)	(811)
Income (loss) from unconsolidated joint ventures	6,668	54	14,237	(2,135)
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	42,254	35,710	83,010	73,031
Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the Company	118,098	253,788	206,928	415,617
Noncontrolling interest in property partnerships	(19,768)	(18,546)	(38,428)	(36,095)
Interest expense	(142,473)	(104,142)	(276,680)	(205,370)
Depreciation and amortization expense	(200,895)	(181,416)	(407,767)	(357,302)
Transaction costs	(308)	(496)	(1,219)	(496)
General and administrative expense	(44,175)	(34,665)	(99,977)	(77,859)
Unrealized Gain (Loss) on Investments	(124)	0	(383)	0
Gains (losses) from investments in securities	(1,571)	4,716	(3,236)	6,978
Interest and other income (loss)	(17,343)	(1,195)	(28,284)	(2,423)
Gains on sales of real estate	0	(99,608)	0	(122,992)
Income (loss) from unconsolidated joint ventures	6,668	54	14,237	(2,135)
Other Income - assignment fee	0	(6,624)	0	(6,624)
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	118,098	253,788	206,928	415,617
Noncontrolling interest in property partnerships	19,768	18,546	38,428	36,095
Interest expense	142,473	104,142	276,680	205,370
Depreciation and amortization expense	200,895	181,416	407,767	357,302
Transaction costs	308	496	1,219	496
Operating expense	4,609	3,239	9,844	7,304
General and administrative expense	44,175	34,665	99,977	77,859
Unrealized Gain (Loss) on Investments	124	0	383	0
Gains (losses) from investments in securities	1,571	(4,716)	3,236	(6,978)
Interest and other income (loss)	17,343	1,195	28,284	2,423
Gains on sales of real estate	0	99,608	0	122,992
Income (loss) from unconsolidated joint ventures	(6,668)	(54)	(14,237)	2,135
Other Income - assignment fee	0	6,624	0	6,624
Other revenue	4,609	3,239	9,844	7,304
Company's share of Net Operating Income	497,785	471,890	982,450	931,472
Management Service [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	(9,858)	(6,354)	(18,838)	(12,185)
Management Service [Member] | Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	9,858	6,354	18,838	12,185
Management Service [Member] | Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	(9,858)	(6,354)	(18,838)	(12,185)
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	9,858	6,354	18,838	12,185
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	47,958	47,862	95,055	94,917
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	47,958	47,862	95,055	94,917
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	$ 47,958	$ 47,862	$ 95,055	$ 94,917

XML

Segment Information (Schedule Of Segment Reporting By Geographic Area And Property Type) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023		Jun. 30, 2022		Jun. 30, 2023		Jun. 30, 2022
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	$ 776,464	[1]	$ 735,333	[1]	$ 1,545,622	[2]	$ 1,462,221	[2]
Rental Revenue: Residential	12,253	[1]	16,912	[1]	23,979	[2]	29,878	[2]
Rental Revenue Total	$ 802,686	[1]	$ 764,334	[1]	$ 1,591,671	[2]	$ 1,508,745	[2]
Rental Revenue: % of Grand Totals	100.00%		100.00%		100.00%		100.00%
Rental Expenses: Class A Office	$ 285,253		$ 264,030		$ 571,098		$ 527,853
Rental Expenses: Residential	5,783		9,818		11,246		16,250
Rental Expenses: Total	$ 299,197		$ 280,292		$ 597,176		$ 555,387
Rental Expenses: % Of Grand Totals	100.00%		100.00%		100.00%		100.00%
Net Operating Income	$ 503,489		$ 484,042		$ 994,495		$ 953,358
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	$ 269,464	[1]	$ 244,936	[1]	$ 539,415	[2]	$ 487,014	[2]
Rental Revenue: Residential	4,124	[1]	3,748	[1]	8,173	[2]	7,344	[2]
Rental Revenue Total	$ 287,557	[1]	$ 260,773	[1]	$ 569,658	[2]	$ 511,004	[2]
Rental Revenue: % of Grand Totals	35.83%		34.11%		35.79%		33.87%
Rental Expenses: Class A Office	$ 95,597		$ 87,027		$ 195,646		$ 177,555
Rental Expenses: Residential	1,601		1,492		3,153		2,929
Rental Expenses: Total	$ 105,359		$ 94,963		$ 213,631		$ 191,768
Rental Expenses: % Of Grand Totals	35.21%		33.88%		35.78%		34.53%
Net Operating Income	$ 182,198		$ 165,810		$ 356,027		$ 319,236
Net Operating Income: % of Grand Totals	36.19%		34.25%		35.80%		33.49%
Company's Share of Net Operating Income: % of Grand Totals	36.08%		34.44%		35.75%		33.70%
Los Angeles [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	$ 0	[1]	$ 0	[1]	$ 0	[2]	$ 0	[2]
Rental Revenue: Residential	0	[1]	0	[1]	0	[2]	0	[2]
Rental Revenue Total	$ 0	[1]	$ 0	[1]	$ 0	[2]	$ 0	[2]
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	2.56%		2.81%		2.65%		2.90%
New York [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	$ 262,979	[1]	$ 254,264	[1]	$ 521,171	[2]	$ 511,134	[2]
Rental Revenue: Residential	0	[1]	0	[1]	0	[2]	0	[2]
Rental Revenue Total	$ 262,979	[1]	$ 254,264	[1]	$ 521,171	[2]	$ 511,134	[2]
Rental Revenue: % of Grand Totals	32.76%		33.27%		32.74%		33.88%
Rental Expenses: Class A Office	$ 102,948		$ 95,363		$ 205,433		$ 191,703
Rental Expenses: Residential	0		0		0		0
Rental Expenses: Total	$ 102,948		$ 95,363		$ 205,433		$ 191,703
Rental Expenses: % Of Grand Totals	34.41%		34.02%		34.40%		34.52%
Net Operating Income	$ 160,031		$ 158,901		$ 315,738		$ 319,431
Net Operating Income: % of Grand Totals	31.78%		32.83%		31.75%		33.51%
Company's Share of Net Operating Income: % of Grand Totals	25.47%		25.95%		25.43%		26.57%
San Francisco [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	$ 136,241	[1]	$ 133,707	[1]	$ 272,334	[2]	$ 266,082	[2]
Rental Revenue: Residential	3,864	[1]	5,850	[1]	7,506	[2]	8,241	[2]
Rental Revenue Total	$ 140,105	[1]	$ 139,557	[1]	$ 279,840	[2]	$ 274,323	[2]
Rental Revenue: % of Grand Totals	17.45%		18.26%		17.58%		18.18%
Rental Expenses: Class A Office	$ 48,197		$ 45,201		$ 94,282		$ 88,609
Rental Expenses: Residential	2,215		5,145		4,388		7,013
Rental Expenses: Total	$ 50,412		$ 50,346		$ 98,670		$ 95,622
Rental Expenses: % Of Grand Totals	16.85%		17.96%		16.52%		17.22%
Net Operating Income	$ 89,693		$ 89,211		$ 181,170		$ 178,701
Net Operating Income: % of Grand Totals	17.81%		18.43%		18.22%		18.74%
Company's Share of Net Operating Income: % of Grand Totals	18.69%		19.58%		19.13%		19.87%
Seattle
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	$ 17,060	[1]	$ 6,472		$ 31,318	[2]	$ 6,472	[2]
Rental Revenue: Residential	0	[1]	0		0	[2]	0	[2]
Rental Revenue Total	$ 17,060	[1]	$ 6,472		$ 31,318	[2]	$ 6,472	[2]
Rental Revenue: % of Grand Totals	2.13%		0.85%		1.97%		0.43%
Rental Expenses: Class A Office	$ 3,082		$ 1,680		$ 6,042		$ 1,680
Rental Expenses: Residential	0		0		0		0
Rental Expenses: Total	$ 3,082		$ 1,680		$ 6,042		$ 1,680
Rental Expenses: % Of Grand Totals	1.03%		0.60%		1.01%		0.30%
Net Operating Income	$ 13,978		$ 4,792		$ 25,276		$ 4,792
Net Operating Income: % of Grand Totals	2.78%		0.99%		2.54%		0.50%
Company's Share of Net Operating Income: % of Grand Totals	3.19%		1.43%		2.95%		0.93%
Washington, DC [Member]
Segment Reporting Information [Line Items]
Rental Revenue: Class A Office	$ 90,720	[1]	$ 95,954	[1]	$ 181,384	[2]	$ 191,519	[2]
Rental Revenue: Residential	4,265	[1]	7,314	[1]	8,300	[2]	14,293	[2]
Rental Revenue Total	$ 94,985	[1]	$ 103,268	[1]	$ 189,684	[2]	$ 205,812	[2]
Rental Revenue: % of Grand Totals	11.83%		13.51%		11.92%		13.64%
Rental Expenses: Class A Office	$ 35,429		$ 34,759		$ 69,695		$ 68,306
Rental Expenses: Residential	1,967		3,181		3,705		6,308
Rental Expenses: Total	$ 37,396		$ 37,940		$ 73,400		$ 74,614
Rental Expenses: % Of Grand Totals	12.50%		13.54%		12.29%		13.43%
Net Operating Income	$ 57,589		$ 65,328		$ 116,284		$ 131,198
Net Operating Income: % of Grand Totals	11.44%		13.50%		11.69%		13.76%
Company's Share of Net Operating Income: % of Grand Totals	14.01%		15.79%		14.09%		16.03%
Hotel [Member]
Segment Reporting Information [Line Items]
Other revenue	$ 13,969	[1]	$ 12,089	[1]	$ 22,070	[2]	$ 16,646	[2]
Operating expense	8,161		6,444		14,832		11,284
Hotel [Member] | Boston [Member]
Segment Reporting Information [Line Items]
Other revenue	13,969	[1]	12,089	[1]	22,070	[2]	16,646	[2]
Operating expense	8,161		6,444		14,832		11,284
Hotel [Member] | Los Angeles [Member]
Segment Reporting Information [Line Items]
Other revenue	0	[1]	0	[1]	0	[2]	0	[2]
Operating expense	0		0		0		0
Hotel [Member] | New York [Member]
Segment Reporting Information [Line Items]
Other revenue	0	[1]	0	[1]	0	[2]	0	[2]
Operating expense	0		0		0		0
Hotel [Member] | San Francisco [Member]
Segment Reporting Information [Line Items]
Other revenue	0	[1]	0	[1]	0	[2]	0	[2]
Operating expense	0		0		0		0
Hotel [Member] | Seattle
Segment Reporting Information [Line Items]
Other revenue	0	[1]	0		0	[2]	0	[2]
Operating expense	0		0		0		0
Hotel [Member] | Washington, DC [Member]
Segment Reporting Information [Line Items]
Other revenue	0	[1]	0	[1]	0	[2]	0	[2]
Operating expense	0		0		0		0
Noncontrolling interest - property partnerships [Member]
Segment Reporting Information [Line Items]
Net Operating Income	(47,958)		(47,862)		(95,055)		(94,917)
Noncontrolling interest - property partnerships [Member] | Boston [Member]
Segment Reporting Information [Line Items]
Net Operating Income	(11,343)		(11,377)		(22,160)		(23,112)
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	(36,615)		(36,485)		(72,895)		(71,805)
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	8,771		8,134		17,348		17,827
Unconsolidated Joint Ventures [Member] | Los Angeles [Member]
Segment Reporting Information [Line Items]
Net Operating Income	12,768		13,247		25,993		27,004
Unconsolidated Joint Ventures [Member] | New York [Member]
Segment Reporting Information [Line Items]
Net Operating Income	3,363		18		7,013		(138)
Unconsolidated Joint Ventures [Member] | San Francisco [Member]
Segment Reporting Information [Line Items]
Net Operating Income	3,332		3,183		6,796		6,364
Unconsolidated Joint Ventures [Member] | Seattle
Segment Reporting Information [Line Items]
Net Operating Income	1,878		1,944		3,724		3,899
Unconsolidated Joint Ventures [Member] | Washington, DC [Member]
Segment Reporting Information [Line Items]
Net Operating Income	12,142		9,184		22,136		18,075
Company's Share [Member]
Segment Reporting Information [Line Items]
Net Operating Income	497,785		471,890		982,450		931,472
Company's Share [Member] | Boston [Member]
Segment Reporting Information [Line Items]
Net Operating Income	179,626		162,567		351,215		313,951
Company's Share [Member] | Los Angeles [Member]
Segment Reporting Information [Line Items]
Net Operating Income	12,768		13,247		25,993		27,004
Company's Share [Member] | New York [Member]
Segment Reporting Information [Line Items]
Net Operating Income	126,779		122,434		249,856		247,488
Company's Share [Member] | San Francisco [Member]
Segment Reporting Information [Line Items]
Net Operating Income	93,025		92,394		187,966		185,065
Company's Share [Member] | Seattle
Segment Reporting Information [Line Items]
Net Operating Income	15,856		6,736		29,000		8,691
Company's Share [Member] | Washington, DC [Member]
Segment Reporting Information [Line Items]
Net Operating Income	$ 69,731		$ 74,512		$ 138,420		$ 149,273

[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.

[2] Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.

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Earnings Per Share / Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Basic Earnings:
Net income attributable to the Company	$ 104,299	$ 222,989	$ 182,215	$ 366,044
Net income attributable to the company's common shareholders / unitholders (in shares / units)	156,826,000	156,720,000	156,815,000	156,685,000
Net income attributable to the company's common shareholders / unitholders (in dollars per share / unit)	$ 0.67	$ 1.42	$ 1.16	$ 2.33
Allocation of undistributed earnings to participating securities		$ (267)		$ (236)
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
Net Income Available To Common Stockholders After Allocation of Undistributed Earnings to Participating Securities Basic		$ 222,722		$ 365,808
Weighted Average Number Of Shares Outstanding After Allocation of Undistributed Earnings to Participating Securities Basic (in shares)		156,720,000		156,685,000
Earnings Per Share After Allocation of Undistributed Earnings to Participating Securities Basic (dollars per share)	$ 0.67	$ 1.42	$ 1.16	$ 2.33
Effect of Dilutive Securities:
Stock Based Compensation	$ 0	$ 0	$ 0	$ 0
Stock Based Compensation (in shares / units)	392,000	472,000	316,000	413,000
Weighted Average Number Diluted Shares Outstanding Adjustment (per share)	$ (0.01)	$ 0	$ 0	$ 0
Diluted Earnings:
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders	$ 104,299	$ 222,722	$ 182,215	$ 365,808
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders (in shares / units)	157,218,000	157,192,000	157,131,000	157,098,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit)	$ 0.66	$ 1.42	$ 1.16	$ 2.33
Boston Properties Limited Partnership
Redeemable Common Units	17,922,000	17,672,000	17,878,000	17,638,000
Basic Earnings:
Net income attributable to the Company	$ 118,098	$ 253,788	$ 206,928	$ 415,617
Net income attributable to the company's common shareholders / unitholders (in shares / units)	174,748,000	174,392,000	174,693,000	174,323,000
Net income attributable to the company's common shareholders / unitholders (in dollars per share / unit)	$ 0.68	$ 1.45	$ 1.18	$ 2.38
Allocation of undistributed earnings to participating securities		$ (297)		$ (263)
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
Net Income Available To Common Stockholders After Allocation of Undistributed Earnings to Participating Securities Basic		$ 253,491		$ 415,354
Weighted Average Number Of Shares Outstanding After Allocation of Undistributed Earnings to Participating Securities Basic (in shares)		174,392,000		174,323,000
Earnings Per Share After Allocation of Undistributed Earnings to Participating Securities Basic (dollars per share)	$ 0.68	$ 1.45	$ 1.18	$ 2.38
Effect of Dilutive Securities:
Stock Based Compensation	$ 0	$ 0	$ 0	$ 0
Stock Based Compensation (in shares / units)	392,000	472,000	316,000	413,000
Weighted Average Number Diluted Shares Outstanding Adjustment (per share)	$ (0.01)	$ 0	$ 0	$ 0
Diluted Earnings:
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders	$ 118,098	$ 253,491	$ 206,928	$ 415,354
Diluted Earnings: Net income attributable to the Company's common shareholders / unitholders (in shares / units)	175,140,000	174,864,000	175,009,000	174,736,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit)	$ 0.67	$ 1.45	$ 1.18	$ 2.38

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Stock Option and Incentive Plan (Narrative) (Details) - USD ($) $ in Thousands	Feb. 07, 2023	Feb. 03, 2023
MYLTIP 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of MYLTIP Awards		$ 3,800
Final awards percentage of target		50.00%
Forfeitures, in units		152,460
MYLTIP 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award	The 2023 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.
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 February 6, 2026, but, in general, may not be converted, redeemed, sold or otherwise transferred for one additional year thereafter.
Value of MYLTIP Awards	$ 13,100
Minimum [Member] | MYLTIP 2023 | Boston Properties Limited Partnership
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for issuance	0
Maximum [Member] | MYLTIP 2023 | Boston Properties Limited Partnership
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for issuance	322,053
Target | MYLTIP 2023 | Boston Properties Limited Partnership
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for issuance	161,026

XML

Stock Option and Incentive Plan Stock and Units (Narrative) (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) shares	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) $ / shares shares	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued | shares	156,932,300		156,932,300		156,836,767
Stock based compensation expense	$ 14,900	$ 14,600	$ 40,900	$ 35,500
Common Stock, Value, Issued	$ 1,569		$ 1,569		$ 1,568
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued | shares	73,414		73,414
LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value Of LTIP Units Issued			$ 29,200
Unvested Restricted stock and LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Annual Installments for Vesting			4
Boston Properties Limited Partnership | LTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP units issued (in shares) | shares	427,176		427,176
Boston Properties Limited Partnership | MYLTIP 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued | shares			322,053
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee and director payment per share (in dollars per share) | $ / shares			$ 0.01
Common Stock, Value, Issued	$ 5,400		$ 5,400
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) | $ / shares			$ 0.25
Ltips (including vested MYLTIPS) And Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expenses	29,200		$ 29,200
Unvested MYLTIP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expenses	$ 800		$ 800
Weighted-average period (years)			2 years 8 months 12 days

XML

Subsequent Events (Details) $ in Thousands	Aug. 01, 2023 ft²	Jul. 28, 2023 USD ($) ft² Integer	Jul. 27, 2023 USD ($)	Jul. 20, 2023 ft²	Jun. 30, 2023
Office Tower Developer LLC
Subsequent Event [Line Items]
Ownership Percentage					50.00%
Subsequent Event [Member] | 140 Kendrick Street - Building A
Subsequent Event [Line Items]
Net Rentable Area (in sf)				104,000
Subsequent Event [Member] | 100 Causeway Street [Member] | Unconsolidated Properties
Subsequent Event [Line Items]
Net Rentable Area (in sf)		634,000
Leased percentage		95.00%
Subsequent Event [Member] | 100 Causeway Street [Member] | Office Tower Developer LLC
Subsequent Event [Line Items]
Ownership Percentage		50.00%
Subsequent Event [Member] | 100 Causeway Street [Member] | Construction Loans
Subsequent Event [Line Items]
Debt | $		$ 336,600	$ 340,600
Extension Option (in years) | Integer		1
Repayments of Construction Loans Payable | $		$ 4,000
Subsequent Event [Member] | 100 Causeway Street [Member] | Construction Loans | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Subsequent Event [Line Items]
Debt Instrument, Description of Variable Rate Basis		Term SOFR	Term SOFR
Debt Instrument, Basis Spread on Variable Rate		1.48%	1.60%
Subsequent Event [Member] | 100 Causeway Street [Member] | Extended Maturity | Construction Loans
Subsequent Event [Line Items]
Fiscal Period Duration		1 year
Subsequent Event [Member] | 343 Madison Avenue
Subsequent Event [Line Items]
Ownership Percentage		55.00%
Subsequent Event [Member] | 343 Madison Avenue | Unconsolidated Properties
Subsequent Event [Line Items]
Net Rentable Area (in sf)		900,000
Subsequent Event [Member] | 343 Madison Avenue | Ground Lease Term of Contract | Unconsolidated Properties
Subsequent Event [Line Items]
Fiscal Period Duration	99 years
Land Subject to Ground Leases	25,000
Subsequent Event [Member] | Unconsolidated Joint Ventures [Member] | 343 Madison Avenue
Subsequent Event [Line Items]
Ownership Percentage		45.00%