Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Equity Method Investments	$ 3,324	$ 5,799	$ 5,463	$ (13,387)
Gains on sales of real estate	18,390	0	18,390	0
Interest and Other Income	8,063	10,788	15,813	25,317
Gains from investments in securities	2,600	315	2,235	2,587
Unrealized gain (loss) on non-real estate investments	(39)	58	(522)	454
Company's share of net operating income from joint ventures	514,080	508,717	1,025,878	1,017,537
General and administrative expense	(42,516)	(44,109)	(94,800)	(94,127)
Transaction costs	(357)	(189)	(1,125)	(702)
Depreciation and amortization expense	(223,819)	(219,542)	(443,926)	(438,258)
Loss on sales-type lease	0	0	2,490	0
Loss from early extinguishment of debt	0	0	338	0
Interest expense	(162,783)	(149,642)	(326,227)	(311,533)
Net Income	119,141	106,949	206,046	213,553
Noncontrolling Interest in Net Income (Loss) Limited Partnerships, Nonredeemable	20,100	17,825	38,849	35,046
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable	10,064	9,509	17,036	19,009
Net income attributable to the Company	88,977	79,615	150,161	159,498
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Company's share of Net Operating Income	493,547	492,913	988,325	990,593
Other revenue	4,104	4,148	8,603	8,441
Income (Loss) from Equity Method Investments	(3,324)	(5,799)	(5,463)	13,387
Gains on sales of real estate	18,390	0	18,390	0
Interest and Other Income	8,063	10,788	15,813	25,317
Gains from investments in securities	2,600	315	2,235	2,587
Unrealized gain (loss) on non-real estate investments	(39)	58	(522)	454
General and administrative expense	42,516	44,109	94,800	94,127
Operating expense	4,104	4,148	8,603	8,441
Transaction costs	357	189	1,125	702
Depreciation and amortization expense	223,819	219,542	443,926	438,258
Loss on sales-type lease	0	0	2,490	0
Impairment loss	0	0	0	13,615
Loss from early extinguishment of debt	0	0	338	0
Interest expense	162,783	149,642	326,227	311,533
Net Income	119,141	106,949	206,046	213,553
Noncontrolling Interest in Net Income (Loss) Limited Partnerships, Nonredeemable	20,100	17,825	38,849	35,046
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable	10,064	9,509	17,036	19,009
Net income attributable to the Company	88,977	79,615	150,161	159,498
Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Equity Method Investments	3,324	5,799	5,463	(13,387)
Gains on sales of real estate	18,489	0	18,489	0
Interest and Other Income	8,063	10,788	15,813	25,317
Gains from investments in securities	2,600	315	2,235	2,587
Unrealized gain (loss) on non-real estate investments	(39)	58	(522)	454
General and administrative expense	(42,516)	(44,109)	(94,800)	(94,127)
Transaction costs	(357)	(189)	(1,125)	(702)
Depreciation and amortization expense	(222,116)	(217,839)	(440,520)	(434,858)
Loss on sales-type lease	0	0	2,490	0
Loss from early extinguishment of debt	0	0	338	0
Interest expense	(162,783)	(149,642)	(326,227)	(311,533)
Net Income	120,943	108,652	209,551	216,953
Noncontrolling Interest in Net Income (Loss) Limited Partnerships, Nonredeemable	20,100	17,825	38,849	35,046
Net income attributable to the Company	100,843	90,827	170,702	181,907
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	493,547	492,913	988,325	990,593
Other revenue	4,104	4,148	8,603	8,441
Income (Loss) from Equity Method Investments	(3,324)	(5,799)	(5,463)	13,387
Gains on sales of real estate	18,489	0	18,489	0
Interest and Other Income	8,063	10,788	15,813	25,317
Gains from investments in securities	2,600	315	2,235	2,587
Unrealized gain (loss) on non-real estate investments	(39)	58	(522)	454
General and administrative expense	42,516	44,109	94,800	94,127
Operating expense	4,104	4,148	8,603	8,441
Transaction costs	357	189	1,125	702
Depreciation and amortization expense	222,116	217,839	440,520	434,858
Loss on sales-type lease	0	0	2,490	0
Impairment loss	0	0	0	13,615
Loss from early extinguishment of debt	0	0	338	0
Interest expense	162,783	149,642	326,227	311,533
Net Income	120,943	108,652	209,551	216,953
Noncontrolling Interest in Net Income (Loss) Limited Partnerships, Nonredeemable	20,100	17,825	38,849	35,046
Net income attributable to the Company	100,843	90,827	170,702	181,907
Unconsolidated Joint Ventures [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Equity Method Investments	3,324	5,799	5,463	(13,387)
Company's share of net operating income from joint ventures	31,029	31,587	63,711	67,017
Transaction costs	(1)	(5)	(171)	(8)
Depreciation and amortization expense	(44,152)	(38,396)	(86,531)	(77,819)
Loss from early extinguishment of debt	0	0	62	0
Interest expense	(45,103)	(43,299)	(89,535)	(86,862)
Net Income	(23,918)	(7,153)	(42,328)	1,168
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	31,029	31,587	63,711	67,017
Management Service [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	8,846	6,352	18,621	12,506
Management Service [Member] \| Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	8,846	6,352	18,621	12,506
Management Service [Member] \| Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	8,846	6,352	18,621	12,506
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	8,846	6,352	18,621	12,506
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	(51,562)	(47,391)	(101,264)	(93,961)
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	51,562	47,391	101,264	93,961
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	$ 51,562	$ 47,391	$ 101,264	$ 93,961

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

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