Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the company's common shareholders / unitholders	$ 360,977,000	$ 108,297,000	$ 727,144,000	$ 311,680,000
Preferred Stock Redemption Charge	0	0	0	(6,412,000)
Preferred dividends / distributions	0	0	0	(2,560,000)
Noncontrolling interest-common units of the Operating Partnership	(40,883,000)	(11,982,000)	(82,821,000)	(35,393,000)
Noncontrolling interest in property partnerships	(18,801,000)	(18,971,000)	(54,896,000)	(52,602,000)
Interest expense	(111,846,000)	(105,794,000)	(317,216,000)	(320,015,000)
Loss from early extinguishment of debt	0	0	0	898,000
Company's share of net operating income from joint ventures	(488,908,000)	(458,729,000)	(1,442,266,000)	(1,355,845,000)
Loss from unconsolidated joint ventures	3,524,000	5,597,000	1,389,000	1,745,000
Depreciation and amortization expense	(190,675,000)	(179,412,000)	(551,445,000)	(539,815,000)
Transaction costs	(1,650,000)	(1,888,000)	(2,146,000)	(2,970,000)
General and administrative expense	(32,519,000)	(34,560,000)	(110,378,000)	(117,924,000)
Gains (losses) from investments in securities	1,571,000	190,000	8,549,000	(3,744,000)
Other Income - assignment fee	0	0	(6,624,000)	0
Interest and other income (loss)	(3,728,000)	(1,520,000)	(6,151,000)	(4,140,000)
Gains on sales of real estate	(262,345,000)	(348,000)	(381,293,000)	(8,104,000)
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the company's common shareholders / unitholders	360,977,000	108,297,000	727,144,000	311,680,000
Preferred Stock Redemption Charge	0	0	0	6,412,000
Preferred dividends / distributions	0	0	0	2,560,000
Noncontrolling interest-common units of the Operating Partnership	40,883,000	11,982,000	82,821,000	35,393,000
Noncontrolling interest in property partnerships	18,801,000	18,971,000	54,896,000	52,602,000
Interest expense	111,846,000	105,794,000	317,216,000	320,015,000
Loss from early extinguishment of debt	0	0	0	898,000
Loss from unconsolidated joint ventures	(3,524,000)	(5,597,000)	(1,389,000)	(1,745,000)
Depreciation and amortization expense	190,675,000	179,412,000	551,445,000	539,815,000
Transaction costs	1,650,000	1,888,000	2,146,000	2,970,000
Operating expense	3,900,000	3,006,000	11,204,000	9,166,000
General and administrative expense	32,519,000	34,560,000	110,378,000	117,924,000
Gains (losses) from investments in securities	(1,571,000)	(190,000)	(8,549,000)	3,744,000
Other Income - assignment fee	0	0	6,624,000	0
Interest and other income (loss)	3,728,000	1,520,000	6,151,000	4,140,000
Gains on sales of real estate	262,345,000	348,000	381,293,000	8,104,000
Other revenue	3,900,000	3,006,000	11,204,000	9,166,000
Company's share of Net Operating Income	475,918,000	435,195,000	1,407,390,000	1,291,860,000
Unconsolidated Joint Ventures [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest expense	(40,678,000)	(27,519,000)	(103,270,000)	(78,711,000)
Loss from early extinguishment of debt	0	0	1,327,000	0
Loss from unconsolidated joint ventures	3,524,000	5,597,000	1,389,000	1,745,000
Depreciation and amortization expense	(44,132,000)	(36,036,000)	(132,089,000)	(103,766,000)
Transaction costs	65,000	0	(746,000)	(7,000)
Unconsolidated Joint Ventures [Member] | Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Company's share of net operating income from joint ventures	35,316,000	24,266,000	108,347,000	74,478,000
Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the company's common shareholders / unitholders	403,578,000	122,014,000	819,195,000	353,633,000
Preferred Stock Redemption Charge	0	0	0	(6,412,000)
Preferred dividends / distributions	0	0	0	(2,560,000)
Noncontrolling interest in property partnerships	(18,801,000)	(18,971,000)	(54,896,000)	(52,602,000)
Interest expense	(111,846,000)	(105,794,000)	(317,216,000)	(320,015,000)
Loss from early extinguishment of debt	0	0	0	898,000
Loss from unconsolidated joint ventures	3,524,000	5,597,000	1,389,000	1,745,000
Depreciation and amortization expense	(188,969,000)	(177,677,000)	(546,271,000)	(533,255,000)
Transaction costs	(1,650,000)	(1,888,000)	(2,146,000)	(2,970,000)
General and administrative expense	(32,519,000)	(34,560,000)	(110,378,000)	(117,924,000)
Gains (losses) from investments in securities	1,571,000	190,000	8,549,000	(3,744,000)
Other Income - assignment fee	0	0	(6,624,000)	0
Interest and other income (loss)	(3,728,000)	(1,520,000)	(6,151,000)	(4,140,000)
Gains on sales of real estate	(262,357,000)	(348,000)	(385,349,000)	(8,104,000)
Boston Properties Limited Partnership | Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the company's common shareholders / unitholders	403,578,000	122,014,000	819,195,000	353,633,000
Preferred Stock Redemption Charge	0	0		6,412,000
Preferred dividends / distributions	0	0	0	2,560,000
Noncontrolling interest in property partnerships	18,801,000	18,971,000	54,896,000	52,602,000
Interest expense	111,846,000	105,794,000	317,216,000	320,015,000
Loss from early extinguishment of debt	0	0	0	898,000
Loss from unconsolidated joint ventures	(3,524,000)	(5,597,000)	(1,389,000)	(1,745,000)
Depreciation and amortization expense	188,969,000	177,677,000	546,271,000	533,255,000
Transaction costs	1,650,000	1,888,000	2,146,000	2,970,000
Operating expense	3,900,000	3,006,000	11,204,000	9,166,000
General and administrative expense	32,519,000	34,560,000	110,378,000	117,924,000
Gains (losses) from investments in securities	(1,571,000)	(190,000)	(8,549,000)	3,744,000
Other Income - assignment fee	0	0	6,624,000	0
Interest and other income (loss)	3,728,000	1,520,000	6,151,000	4,140,000
Gains on sales of real estate	262,357,000	348,000	385,349,000	8,104,000
Other revenue	3,900,000	3,006,000	11,204,000	9,166,000
Company's share of Net Operating Income	475,918,000	435,195,000	1,407,390,000	1,291,860,000
Management Service [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	(7,465,000)	(6,094,000)	(19,650,000)	(20,181,000)
Management Service [Member] | Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	7,465,000	6,094,000	19,650,000	20,181,000
Management Service [Member] | Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	(7,465,000)	(6,094,000)	(19,650,000)	(20,181,000)
Management Service [Member] | Boston Properties Limited Partnership | Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	7,465,000	6,094,000	19,650,000	20,181,000
Noncontrolling interest - property partnerships [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Company's share of net operating income from joint ventures	48,306,000	47,800,000	143,223,000	138,463,000
Noncontrolling interest - property partnerships [Member] | Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Company's share of net operating income from joint ventures	48,306,000	47,800,000	143,223,000	138,463,000
Noncontrolling interest - property partnerships [Member] | Boston Properties Limited Partnership | Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Company's share of net operating income from joint ventures	$ 48,306,000	$ 47,800,000	$ 143,223,000	$ 138,463,000