Consolidated Statements Of Operations - USD ($) shares in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue
Lease		$ 692,260,000	$ 666,674,000	$ 2,062,102,000	$ 2,006,904,000
Total revenue		730,056,000	693,268,000	2,157,558,000	2,100,597,000
Expenses
Rental		258,281,000	258,261,000	764,373,000	761,014,000
General and administrative		34,560,000	27,862,000	117,924,000	102,059,000
Transaction costs		1,888,000	307,000	2,970,000	1,254,000
Depreciation and amortization		179,412,000	166,456,000	539,815,000	515,738,000
Total expenses		481,093,000	458,946,000	1,442,241,000	1,400,640,000
Other income (expense)
Income (Loss) from Unconsolidated Joint Ventures		(5,597,000)	(6,873,000)	(1,745,000)	(5,410,000)
Gains (losses) on sales of real estate		348,000	(209,000)	8,104,000	613,723,000
Interest and other income (loss)		1,520,000	(45,000)	4,140,000	4,277,000
Gains (losses) from investments in securities		(190,000)	1,858,000	3,744,000	965,000
Loss from early extinguishment of debt		0	0	(898,000)	0
Interest expense		(105,794,000)	(110,993,000)	(320,015,000)	(319,726,000)
Net income		139,250,000	118,060,000	408,647,000	993,786,000
Net (income) loss attributable to noncontrolling interests
Noncontrolling interests in property partnerships		(18,971,000)	(15,561,000)	(52,602,000)	(34,280,000)
Noncontrolling interest - common units of the Operating Partnership		(11,982,000)	(10,020,000)	(35,393,000)	(97,090,000)
Net income attributable to the Company		108,297,000	92,479,000	320,652,000	862,416,000
Preferred dividends / distributions		0	(2,625,000)	(2,560,000)	(7,875,000)
Preferred Stock Redemption Charge		0	0	(6,412,000)	0
Net income attributable to the Company's common shareholders / unitholders		$ 108,297,000	$ 89,854,000	$ 311,680,000	$ 854,541,000
Basic earnings per common share / unit attributable to the Company
Earnings Per Share After Allocation of Undistributed Earnings to Participating Securities Basic (dollars per share)		$ 0.69	$ 0.58	$ 2.00	$ 5.49
Weighted average number of common shares / units outstanding (in shares / units)		156,183	155,645	156,062	155,349
Diluted earnings per common share / unit attributable to the Company
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit)		$ 0.69	$ 0.58	$ 1.99	$ 5.49
Weighted average number of common and common equivalent shares / units outstanding (in shares / units)		156,598	155,670	156,394	155,447
Boston Properties Limited Partnership
Revenue
Lease		$ 692,260,000	$ 666,674,000	$ 2,062,102,000	$ 2,006,904,000
Total revenue		730,056,000	693,268,000	2,157,558,000	2,100,597,000
Expenses
Rental		258,281,000	258,261,000	764,373,000	761,014,000
General and administrative		34,560,000	27,862,000	117,924,000	102,059,000
Transaction costs		1,888,000	307,000	2,970,000	1,254,000
Depreciation and amortization		177,677,000	164,706,000	533,255,000	510,400,000
Total expenses		479,358,000	457,196,000	1,435,681,000	1,395,302,000
Other income (expense)
Income (Loss) from Unconsolidated Joint Ventures		(5,597,000)	(6,873,000)	(1,745,000)	(5,410,000)
Gains (losses) on sales of real estate		348,000	(209,000)	8,104,000	626,686,000
Interest and other income (loss)		1,520,000	(45,000)	4,140,000	4,277,000
Gains (losses) from investments in securities		(190,000)	1,858,000	3,744,000	965,000
Loss from early extinguishment of debt		0	0	(898,000)	0
Interest expense		(105,794,000)	(110,993,000)	(320,015,000)	(319,726,000)
Net income		140,985,000	119,810,000	415,207,000	1,012,087,000
Net (income) loss attributable to noncontrolling interests
Noncontrolling interests in property partnerships		(18,971,000)	(15,561,000)	(52,602,000)	(34,280,000)
Net income attributable to the Company		122,014,000	104,249,000	362,605,000	977,807,000
Preferred dividends / distributions		0	(2,625,000)	(2,560,000)	(7,875,000)
Preferred Stock Redemption Charge		0	0	(6,412,000)	0
Net income attributable to the Company's common shareholders / unitholders		$ 122,014,000	$ 101,624,000	$ 353,633,000	$ 969,932,000
Basic earnings per common share / unit attributable to the Company
Earnings Per Share After Allocation of Undistributed Earnings to Participating Securities Basic (dollars per share)		$ 0.70	$ 0.59	$ 2.04	$ 5.61
Weighted average number of common shares / units outstanding (in shares / units)		173,194	172,677	173,078	172,628
Diluted earnings per common share / unit attributable to the Company
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit)		$ 0.70	$ 0.59	$ 2.04	$ 5.61
Weighted average number of common and common equivalent shares / units outstanding (in shares / units)		173,609	172,702	173,410	172,726
Parking and Other [Member]
Revenue
Other revenue		$ 23,507,000	$ 16,327,000	$ 58,727,000	$ 54,777,000
Parking and Other [Member] | Boston Properties Limited Partnership
Revenue
Other revenue		23,507,000	16,327,000	58,727,000	54,777,000
Hotel [Member]
Revenue
Other revenue	[1]	5,189,000	90,000	7,382,000	7,014,000
Expenses
Operating expense		3,946,000	3,164,000	7,993,000	11,958,000
Hotel [Member] | Boston Properties Limited Partnership
Revenue
Other revenue		5,189,000	90,000	7,382,000	7,014,000
Expenses
Operating expense		3,946,000	3,164,000	7,993,000	11,958,000
Real Estate, Other [Member]
Revenue
Other revenue		3,006,000	2,896,000	9,166,000	8,617,000
Expenses
Operating expense		3,006,000	2,896,000	9,166,000	8,617,000
Real Estate, Other [Member] | Boston Properties Limited Partnership
Revenue
Other revenue		3,006,000	2,896,000	9,166,000	8,617,000
Expenses
Operating expense		3,006,000	2,896,000	9,166,000	8,617,000
Management Service [Member]
Revenue
Other revenue		6,094,000	7,281,000	20,181,000	23,285,000
Management Service [Member] | Boston Properties Limited Partnership
Revenue
Other revenue		$ 6,094,000	$ 7,281,000	$ 20,181,000	$ 23,285,000

[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.