Consolidated Statements Of Operations - USD ($) shares in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue
Lease		$ 684,025,000	$ 630,119,000	$ 1,369,842,000	$ 1,340,230,000
Total revenue		713,807,000	654,773,000	1,427,502,000	1,407,329,000
Expenses
Rental		248,703,000	239,787,000	506,092,000	502,753,000
General and administrative		38,405,000	37,743,000	83,364,000	74,197,000
Transaction costs		751,000	332,000	1,082,000	947,000
Depreciation and amortization		183,838,000	178,188,000	360,403,000	349,282,000
Total expenses		476,348,000	460,507,000	961,148,000	941,694,000
Other income (expense)
Income (Loss) from Unconsolidated Joint Ventures		(1,373,000)	1,832,000	3,852,000	1,463,000
Gains (losses) on sales of real estate		7,756,000	203,767,000	7,756,000	613,932,000
Interest and other income (loss)		1,452,000	1,305,000	2,620,000	4,322,000
Gains (losses) from investments in securities		2,275,000	4,552,000	3,934,000	(893,000)
Loss from early extinguishment of debt		0	0	(898,000)	0
Interest expense		(106,319,000)	(107,142,000)	(214,221,000)	(208,733,000)
Net income		141,250,000	298,580,000	269,397,000	875,726,000
Net (income) loss attributable to noncontrolling interests
Noncontrolling interests in property partnerships		(17,164,000)	767,000	(33,631,000)	(18,719,000)
Noncontrolling interest - common units of the Operating Partnership		(12,383,000)	(30,197,000)	(23,422,000)	(87,525,000)
Net income attributable to the Company		111,703,000	269,150,000	212,344,000	769,482,000
Preferred dividends / distributions		0	(2,625,000)	(2,560,000)	(5,250,000)
Preferred Stock Redemption Charge		0	0	(6,412,000)	0
Net income attributable to the Company's common shareholders / unitholders		$ 111,703,000	$ 266,525,000	$ 203,372,000	$ 764,232,000
Basic earnings per common share / unit attributable to the Company
Earnings Per Share After Allccation of Undistributed Earnings to Particiapting Securities Basic (dollars per share)		$ 0.72	$ 1.71	$ 1.30	$ 4.92
Weighted average number of common shares / units outstanding (in shares / units)		156,107	155,386	156,016	155,199
Diluted earnings per common share / unit attributable to the Company
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit)		$ 0.71	$ 1.71	$ 1.30	$ 4.91
Weighted average number of common and common equivalent shares / units outstanding (in shares / units)		156,519	155,407	156,307	155,333
Boston Properties Limited Partnership
Revenue
Lease		$ 684,025,000	$ 630,119,000	$ 1,369,842,000	$ 1,340,230,000
Total revenue		713,807,000	654,773,000	1,427,502,000	1,407,329,000
Expenses
Rental		248,703,000	239,787,000	506,092,000	502,753,000
General and administrative		38,405,000	37,743,000	83,364,000	74,197,000
Transaction costs		751,000	332,000	1,082,000	947,000
Depreciation and amortization		182,078,000	176,409,000	355,578,000	345,694,000
Total expenses		474,588,000	458,728,000	956,323,000	938,106,000
Other income (expense)
Income (Loss) from Unconsolidated Joint Ventures		(1,373,000)	1,832,000	3,852,000	1,463,000
Gains (losses) on sales of real estate		7,756,000	207,241,000	7,756,000	626,895,000
Interest and other income (loss)		1,452,000	1,305,000	2,620,000	4,322,000
Gains (losses) from investments in securities		2,275,000	4,552,000	3,934,000	(893,000)
Loss from early extinguishment of debt		0	0	(898,000)	0
Interest expense		(106,319,000)	(107,142,000)	(214,221,000)	(208,733,000)
Net income		143,010,000	303,833,000	274,222,000	892,277,000
Net (income) loss attributable to noncontrolling interests
Noncontrolling interests in property partnerships		(17,164,000)	767,000	(33,631,000)	(18,719,000)
Net income attributable to the Company		125,846,000	304,600,000	240,591,000	873,558,000
Preferred dividends / distributions		0	(2,625,000)	(2,560,000)	(5,250,000)
Preferred Stock Redemption Charge		0	0	(6,412,000)	0
Net income attributable to the Company's common shareholders / unitholders		$ 125,846,000	$ 301,975,000	$ 231,619,000	$ 868,308,000
Basic earnings per common share / unit attributable to the Company
Earnings Per Share After Allccation of Undistributed Earnings to Particiapting Securities Basic (dollars per share)		$ 0.73	$ 1.75	$ 1.34	$ 5.02
Weighted average number of common shares / units outstanding (in shares / units)		173,150	172,659	173,034	172,604
Diluted earnings per common share / unit attributable to the Company
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit)		$ 0.73	$ 1.75	$ 1.34	$ 5.02
Weighted average number of common and common equivalent shares / units outstanding (in shares / units)		173,562	172,680	173,325	172,738
Parking and Other [Member]
Revenue
Other revenue		$ 18,282,000	$ 13,946,000	$ 35,220,000	$ 38,450,000
Parking and Other [Member] | Boston Properties Limited Partnership
Revenue
Other revenue		18,282,000	13,946,000	35,220,000	38,450,000
Hotel [Member]
Revenue
Other revenue	[1]	1,561,000	99,000	2,193,000	6,924,000
Expenses
Operating expense		1,996,000	1,973,000	4,047,000	8,794,000
Hotel [Member] | Boston Properties Limited Partnership
Revenue
Other revenue		1,561,000	99,000	2,193,000	6,924,000
Expenses
Operating expense		1,996,000	1,973,000	4,047,000	8,794,000
Real Estate, Other [Member]
Revenue
Other revenue		2,655,000	2,484,000	6,160,000	5,721,000
Expenses
Operating expense		2,655,000	2,484,000	6,160,000	5,721,000
Real Estate, Other [Member] | Boston Properties Limited Partnership
Revenue
Other revenue		2,655,000	2,484,000	6,160,000	5,721,000
Expenses
Operating expense		2,655,000	2,484,000	6,160,000	5,721,000
Management Service [Member]
Revenue
Other revenue		7,284,000	8,125,000	14,087,000	16,004,000
Management Service [Member] | Boston Properties Limited Partnership
Revenue
Other revenue		$ 7,284,000	$ 8,125,000	$ 14,087,000	$ 16,004,000

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