Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the Company	$ 83,628	$ (111,826)	$ 243,126	$ 70,290
Noncontrolling interest-common units of the Operating Partnership	(9,587)	12,626	(28,596)	(8,642)
Noncontrolling interest in property partnerships	(15,237)	(20,909)	(50,283)	(59,337)
Interest expense	(163,194)	(147,812)	(474,727)	(424,492)
Gain (Loss) from interest rate contracts	0	0	0	0
Company's share of net operating income from joint ventures	(511,078)	(501,881)	(1,528,615)	(1,496,376)
Depreciation and amortization expense	(222,890)	(207,435)	(661,148)	(618,746)
Transaction costs	(188)	(751)	(890)	(1,970)
General and administrative expense	(33,352)	(31,410)	(127,479)	(131,387)
Unrealized gain (loss) on non-real estate investments	(94)	51	(548)	(332)
Gains (losses) from investments in securities	(2,198)	925	(4,785)	(2,311)
Interest and other income (loss)	(14,430)	(20,715)	(39,747)	(48,999)
Gains on sales of real estate	(517)	(517)	(517)	(517)
Income (loss) from unconsolidated joint ventures	7,011	247,556	(6,376)	261,793
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the Company	83,628	(111,826)	243,126	70,290
Noncontrolling interest-common units of the Operating Partnership	9,587	(12,626)	28,596	8,642
Noncontrolling interest in property partnerships	15,237	20,909	50,283	59,337
Interest expense	163,194	147,812	474,727	424,492
Impairment loss	0	0	13,615	0
Depreciation and amortization expense	222,890	207,435	661,148	618,746
Transaction costs	188	751	890	1,970
Operating expense	3,649	3,906	12,090	13,750
General and administrative expense	33,352	31,410	127,479	131,387
Unrealized gain (loss) on non-real estate investments	94	(51)	548	332
Gains (losses) from investments in securities	2,198	(925)	4,785	2,311
Interest and other income (loss)	14,430	20,715	39,747	48,999
Gains on sales of real estate	517	517	517	517
Income (loss) from unconsolidated joint ventures	(7,011)	(247,556)	6,376	(261,793)
Other revenue	3,649	3,906	12,090	13,750
Company's share of Net Operating Income	498,510	490,999	1,489,103	1,473,449
Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the Company	94,919	(122,696)	276,826	84,232
Noncontrolling interest in property partnerships	(15,237)	(20,909)	(50,283)	(59,337)
Interest expense	(163,194)	(147,812)	(474,727)	(424,492)
Depreciation and amortization expense	(221,186)	(205,679)	(656,044)	(613,446)
Transaction costs	(188)	(751)	(890)	(1,970)
General and administrative expense	(33,352)	(31,410)	(127,479)	(131,387)
Unrealized gain (loss) on non-real estate investments	(94)	51	(548)	(332)
Gains (losses) from investments in securities	(2,198)	925	(4,785)	(2,311)
Interest and other income (loss)	(14,430)	(20,715)	(39,747)	(48,999)
Gains on sales of real estate	(517)	(517)	(517)	(517)
Income (loss) from unconsolidated joint ventures	7,011	247,556	(6,376)	261,793
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	94,919	(122,696)	276,826	84,232
Noncontrolling interest in property partnerships	15,237	20,909	50,283	59,337
Interest expense	163,194	147,812	474,727	424,492
Impairment loss	0	0	13,615	0
Depreciation and amortization expense	221,186	205,679	656,044	613,446
Transaction costs	188	751	890	1,970
Operating expense	3,649	3,906	12,090	13,750
General and administrative expense	33,352	31,410	127,479	131,387
Unrealized gain (loss) on non-real estate investments	94	(51)	548	332
Gains (losses) from investments in securities	2,198	(925)	4,785	2,311
Interest and other income (loss)	14,430	20,715	39,747	48,999
Gains on sales of real estate	517	517	517	517
Income (loss) from unconsolidated joint ventures	(7,011)	(247,556)	6,376	(261,793)
Other revenue	3,649	3,906	12,090	13,750
Company's share of Net Operating Income	498,510	490,999	1,489,103	1,473,449
Unconsolidated Joint Ventures [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest expense	(45,244)	(60,737)	(132,106)	(176,786)
Losses from early extinguishment of debt	0	0	0	3
Company's share of net operating income from joint ventures	(31,919)	(39,165)	(98,936)	(122,175)
Depreciation and amortization expense	(41,082)	(49,840)	(118,901)	(151,051)
Transaction costs	(53)	(78)	(61)	(179)
Income (loss) from unconsolidated joint ventures	7,011	247,556	(6,376)	261,793
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	31,919	39,165	98,936	122,175
Management Service [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	(6,770)	(9,284)	(19,276)	(28,122)
Management Service [Member] \| Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	6,770	9,284	19,276	28,122
Management Service [Member] \| Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	(6,770)	(9,284)	(19,276)	(28,122)
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	6,770	9,284	19,276	28,122
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	44,487	50,047	138,448	145,102
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	44,487	50,047	138,448	145,102
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	$ 44,487	$ 50,047	$ 138,448	$ 145,102

The net result for the period of deducting property operating expenses from property operating revenues.

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