Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the company's common shareholders / unitholders	$ 77,890	$ 143,047
Noncontrolling interest-common units of the Operating Partnership	(9,078)	(16,361)
Noncontrolling interest in property partnerships	(18,660)	(17,549)
Interest expense	(134,207)	(101,228)
Company's share of net operating income from joint ventures	(491,006)	(469,316)
Depreciation and amortization expense	(208,734)	(177,624)
Transaction costs	(911)	0
General and administrative expense	(55,802)	(43,194)
Unrealized Gain (Loss) on Investments	(259)	0
Gains (losses) from investments in securities	(1,665)	2,262
Interest and other income (loss)	(10,941)	(1,228)
Gains on sales of real estate	0	(22,701)
Income (loss) from unconsolidated joint ventures	7,569	(2,189)
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	77,890	143,047
Noncontrolling interest-common units of the Operating Partnership	9,078	16,361
Noncontrolling interest in property partnerships	18,660	17,549
Interest expense	134,207	101,228
Depreciation and amortization expense	208,734	177,624
Transaction costs	911	0
Operating expense	5,235	4,065
General and administrative expense	55,802	43,194
Gains (losses) from investments in securities	1,665	(2,262)
Interest and other income (loss)	10,941	1,228
Gains on sales of real estate	0	22,701
Income (loss) from unconsolidated joint ventures	(7,569)	2,189
Other revenue	5,235	4,065
Company's share of Net Operating Income	484,665	459,582
Unconsolidated Joint Ventures [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest expense	(57,250)	(30,373)
Losses from early extinguishment of debt	0	1,327
Depreciation and amortization expense	(49,978)	(44,664)
Transaction costs	(74)	0
Income (loss) from unconsolidated joint ventures	7,569	(2,189)
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	40,756	37,321
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	88,830	161,829
Noncontrolling interest in property partnerships	(18,660)	(17,549)
Interest expense	(134,207)	(101,228)
Depreciation and amortization expense	(206,872)	(175,886)
Transaction costs	(911)	0
General and administrative expense	(55,802)	(43,194)
Unrealized Gain (Loss) on Investments	(259)	0
Gains (losses) from investments in securities	(1,665)	2,262
Interest and other income (loss)	(10,941)	(1,228)
Gains on sales of real estate	0	(23,384)
Income (loss) from unconsolidated joint ventures	7,569	(2,189)
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	88,830	161,829
Noncontrolling interest in property partnerships	18,660	17,549
Interest expense	134,207	101,228
Depreciation and amortization expense	206,872	175,886
Transaction costs	911	0
Operating expense	5,235	4,065
General and administrative expense	55,802	43,194
Gains (losses) from investments in securities	1,665	(2,262)
Interest and other income (loss)	10,941	1,228
Gains on sales of real estate	0	23,384
Other revenue	5,235	4,065
Company's share of Net Operating Income	484,665	459,582
Management Service [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	(8,980)	(5,831)
Management Service [Member] | Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	8,980	5,831
Management Service [Member] | Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	(8,980)	(5,831)
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	8,980	5,831
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	47,097	47,055
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	47,097	47,055
Unrealized Gain (Loss) on Investments	259	0
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	47,097	47,055
Unrealized Gain (Loss) on Investments	259	0
Income (loss) from unconsolidated joint ventures	$ (7,569)	$ 2,189