Consolidated Balance Sheets - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $7,376,175 and $7,054,075 at March 31, 2024 and December 31, 2023, respectively)		$ 27,063,048	$ 26,749,209
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at March 31, 2024 and December 31, 2023, respectively)		401,486	401,680
Right of use assets - operating leases (amounts related to VIEs of $154,217 and $158,885 at March 31, 2024 and December 31, 2023, respectively)	[1]	344,255	324,298
Less: accumulated depreciation (amounts related to VIEs of $(1,538,940) and $(1,501,483) at March 31, 2024 and December 31, 2023, respectively)		(7,040,501)	(6,881,728)
Total real estate		20,768,288	20,593,459
Cash and cash equivalents (amounts related to VIEs of $298,548 and $245,317 at March 31, 2024 and December 31, 2023, respectively)		701,695	1,531,477
Cash held in escrows (amounts related to VIEs of $4,839 and $22,160 at March 31, 2024 and December 31, 2023, respectively)		64,939	81,090
Investments in securities		37,184	36,337
Tenant and other receivables, net (amounts related to VIEs of $27,792 and $27,987 at March 31, 2024 and December 31, 2023, respectively)		94,115	122,407
Note receivable, net		2,274	1,714
Sales-type lease receivable, net		13,943	13,704
Accrued rental income, net (amounts related to VIEs of $409,628 and $401,159 at March 31, 2024 and December 31, 2023, respectively)		1,390,217	1,355,212
Deferred charges, net (amounts related to VIEs of $194,489 and $175,383 at March 31, 2024 and December 31, 2023, respectively)		818,424	760,421
Prepaid expenses and other assets (amounts related to VIEs of $45,672 and $11,824 at March 31, 2024 and December 31, 2023, respectively)		146,286	64,230
Investments in unconsolidated joint ventures		1,399,824	1,377,319
Total assets		25,525,978	26,026,149
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $3,278,396 and $3,277,185 at March 31, 2024 and December 31, 2023, respectively)		4,368,367	4,166,379
Unsecured senior notes, net		9,794,527	10,491,617
Unsecured line of credit		0	0
Unsecured term loan, net		1,199,430	1,198,301
Lease liabilities - finance leases (amounts related to VIEs of $20,831 and $20,794 at March 31, 2024 and December 31, 2023, respectively)		415,888	417,961
Lease liabilities - operating leases (amounts related to VIEs of $148,706 and $145,826 at March 31, 2024 and December 31, 2023, respectively)		377,667	350,391
Accounts payable and accrued expenses (amounts related to VIEs of $112,385 and $59,667 at March 31, 2024 and December 31, 2023, respectively)		374,681	458,329
Dividends and distributions payable		172,154	171,176
Accrued interest payable		119,573	133,684
Other liabilities (amounts related to VIEs of $105,786 and $115,275 at March 31, 2024 and December 31, 2023, respectively)		417,978	445,947
Total liabilities		17,240,265	17,833,785
Redeemable deferred stock units— 124,656 and 119,471 units outstanding at redemption value at March 31, 2024 and December 31, 2023, respectively		$ 8,141	$ 8,383
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, 157,128,071 and 157,019,766 issued and 157,049,171 and 156,940,866 outstanding at March 31, 2024 and December 31, 2023, respectively		1,570	1,569
Additional paid-in capital		6,752,648	6,715,149
Dividends in excess of earnings		$ (890,177)	$ (816,152)
Treasury common stock at cost, shares		78,900	78,900
Treasury common stock at cost, 78,900 shares at March 31, 2024 and December 31, 2023		$ (2,722)	$ (2,722)
Accumulated other comprehensive loss		(3,620)	(21,147)
Total stockholders' equity attributable to Boston Properties, Inc.		5,857,699	5,876,697
Noncontrolling interests:
Common units of the Operating Partnership		684,969	666,580
Property partnerships		1,734,904	1,640,704
Total equity / capital		8,277,572	8,183,981
Total liabilities and equity / capital		25,525,978	26,026,149
Related Party
ASSETS
Related party note receivable, net		88,789	88,779
Variable Interest Entity, Primary Beneficiary [Member]
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $7,376,175 and $7,054,075 at March 31, 2024 and December 31, 2023, respectively)		7,376,175	7,054,075
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at March 31, 2024 and December 31, 2023, respectively)		21,000	21,000
Right of use assets - operating leases (amounts related to VIEs of $154,217 and $158,885 at March 31, 2024 and December 31, 2023, respectively)		154,217	158,885
Less: accumulated depreciation (amounts related to VIEs of $(1,538,940) and $(1,501,483) at March 31, 2024 and December 31, 2023, respectively)		(1,538,940)	(1,501,483)
Cash and cash equivalents (amounts related to VIEs of $298,548 and $245,317 at March 31, 2024 and December 31, 2023, respectively)		298,548	245,317
Cash held in escrows (amounts related to VIEs of $4,839 and $22,160 at March 31, 2024 and December 31, 2023, respectively)		4,839	22,160
Tenant and other receivables, net (amounts related to VIEs of $27,792 and $27,987 at March 31, 2024 and December 31, 2023, respectively)		27,792	27,987
Accrued rental income, net (amounts related to VIEs of $409,628 and $401,159 at March 31, 2024 and December 31, 2023, respectively)		409,628	401,159
Deferred charges, net (amounts related to VIEs of $194,489 and $175,383 at March 31, 2024 and December 31, 2023, respectively)		194,489	175,383
Prepaid expenses and other assets (amounts related to VIEs of $45,672 and $11,824 at March 31, 2024 and December 31, 2023, respectively)		45,672	11,824
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $3,278,396 and $3,277,185 at March 31, 2024 and December 31, 2023, respectively)		3,278,396	3,277,185
Lease liabilities - finance leases (amounts related to VIEs of $20,831 and $20,794 at March 31, 2024 and December 31, 2023, respectively)		20,831	20,794
Lease liabilities - operating leases (amounts related to VIEs of $148,706 and $145,826 at March 31, 2024 and December 31, 2023, respectively)		148,706	145,826
Accounts payable and accrued expenses (amounts related to VIEs of $112,385 and $59,667 at March 31, 2024 and December 31, 2023, respectively)		112,385	59,667
Other liabilities (amounts related to VIEs of $105,786 and $115,275 at March 31, 2024 and December 31, 2023, respectively)		105,786	115,275
Boston Properties Limited Partnership
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $7,376,175 and $7,054,075 at March 31, 2024 and December 31, 2023, respectively)		26,696,783	26,382,944
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at March 31, 2024 and December 31, 2023, respectively)		401,486	401,680
Right of use assets - operating leases (amounts related to VIEs of $154,217 and $158,885 at March 31, 2024 and December 31, 2023, respectively)	[1]	344,255	324,298
Less: accumulated depreciation (amounts related to VIEs of $(1,538,940) and $(1,501,483) at March 31, 2024 and December 31, 2023, respectively)		(6,915,437)	(6,758,361)
Total real estate		20,527,087	20,350,561
Cash and cash equivalents (amounts related to VIEs of $298,548 and $245,317 at March 31, 2024 and December 31, 2023, respectively)		701,695	1,531,477
Cash held in escrows (amounts related to VIEs of $4,839 and $22,160 at March 31, 2024 and December 31, 2023, respectively)		64,939	81,090
Investments in securities		37,184	36,337
Tenant and other receivables, net (amounts related to VIEs of $27,792 and $27,987 at March 31, 2024 and December 31, 2023, respectively)		94,115	122,407
Note receivable, net		2,274	1,714
Sales-type lease receivable, net		13,943	13,704
Accrued rental income, net (amounts related to VIEs of $409,628 and $401,159 at March 31, 2024 and December 31, 2023, respectively)		1,390,217	1,355,212
Deferred charges, net (amounts related to VIEs of $194,489 and $175,383 at March 31, 2024 and December 31, 2023, respectively)		818,424	760,421
Prepaid expenses and other assets (amounts related to VIEs of $45,672 and $11,824 at March 31, 2024 and December 31, 2023, respectively)		146,286	64,230
Investments in unconsolidated joint ventures		1,399,824	1,377,319
Total assets		25,284,777	25,783,251
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $3,278,396 and $3,277,185 at March 31, 2024 and December 31, 2023, respectively)		4,368,367	4,166,379
Unsecured senior notes, net		9,794,527	10,491,617
Unsecured line of credit		0	0
Unsecured term loan, net		1,199,430	1,198,301
Lease liabilities - finance leases (amounts related to VIEs of $20,831 and $20,794 at March 31, 2024 and December 31, 2023, respectively)		415,888	417,961
Lease liabilities - operating leases (amounts related to VIEs of $148,706 and $145,826 at March 31, 2024 and December 31, 2023, respectively)		377,667	350,391
Accounts payable and accrued expenses (amounts related to VIEs of $112,385 and $59,667 at March 31, 2024 and December 31, 2023, respectively)		374,681	458,329
Dividends and distributions payable		172,154	171,176
Accrued interest payable		119,573	133,684
Other liabilities (amounts related to VIEs of $105,786 and $115,275 at March 31, 2024 and December 31, 2023, respectively)		417,978	445,947
Total liabilities		17,240,265	17,833,785
Redeemable deferred stock units— 124,656 and 119,471 units outstanding at redemption value at March 31, 2024 and December 31, 2023, respectively		8,141	8,383
Noncontrolling interest:
Redeemable partnership units— 16,492,171 and 16,508,277 common units and 2,666,636 and 2,065,861 long term incentive units outstanding at redemption value at March 31, 2024 and December 31, 2023, respectively		1,300,409	1,347,575
Equity / Capital:
Boston Properties Limited Partnership partners’ capital— 1,762,080 and 1,755,150 general partner units and 155,287,091 and 155,185,716 limited partner units outstanding at March 31, 2024 and December 31, 2023, respectively		5,004,678	4,973,951
Accumulated other comprehensive loss		(3,620)	(21,147)
Total partners’ capital		5,001,058	4,952,804
Noncontrolling interests in property partnerships		1,734,904	1,640,704
Noncontrolling interests:
Total equity / capital		6,735,962	6,593,508
Total liabilities and equity / capital		25,284,777	25,783,251
Boston Properties Limited Partnership | Related Party
ASSETS
Related party note receivable, net		88,789	88,779
Boston Properties Limited Partnership | Variable Interest Entity, Primary Beneficiary [Member]
ASSETS
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $7,376,175 and $7,054,075 at March 31, 2024 and December 31, 2023, respectively)		7,376,175	7,054,075
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at March 31, 2024 and December 31, 2023, respectively)		21,000	21,000
Right of use assets - operating leases (amounts related to VIEs of $154,217 and $158,885 at March 31, 2024 and December 31, 2023, respectively)		154,217	158,885
Less: accumulated depreciation (amounts related to VIEs of $(1,538,940) and $(1,501,483) at March 31, 2024 and December 31, 2023, respectively)		(1,538,940)	(1,501,483)
Cash and cash equivalents (amounts related to VIEs of $298,548 and $245,317 at March 31, 2024 and December 31, 2023, respectively)		298,548	245,317
Cash held in escrows (amounts related to VIEs of $4,839 and $22,160 at March 31, 2024 and December 31, 2023, respectively)		4,839	22,160
Tenant and other receivables, net (amounts related to VIEs of $27,792 and $27,987 at March 31, 2024 and December 31, 2023, respectively)		27,792	27,987
Accrued rental income, net (amounts related to VIEs of $409,628 and $401,159 at March 31, 2024 and December 31, 2023, respectively)		409,628	401,159
Deferred charges, net (amounts related to VIEs of $194,489 and $175,383 at March 31, 2024 and December 31, 2023, respectively)		194,489	175,383
Prepaid expenses and other assets (amounts related to VIEs of $45,672 and $11,824 at March 31, 2024 and December 31, 2023, respectively)		45,672	11,824
Liabilities:
Mortgage notes payable, net (amounts related to VIEs of $3,278,396 and $3,277,185 at March 31, 2024 and December 31, 2023, respectively)		3,278,396	3,277,185
Lease liabilities - finance leases (amounts related to VIEs of $20,831 and $20,794 at March 31, 2024 and December 31, 2023, respectively)		20,831	20,794
Lease liabilities - operating leases (amounts related to VIEs of $148,706 and $145,826 at March 31, 2024 and December 31, 2023, respectively)		148,706	145,826
Accounts payable and accrued expenses (amounts related to VIEs of $112,385 and $59,667 at March 31, 2024 and December 31, 2023, respectively)		112,385	59,667
Other liabilities (amounts related to VIEs of $105,786 and $115,275 at March 31, 2024 and December 31, 2023, respectively)		$ 105,786	$ 115,275

[1] See Note 4.