Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the Company	$ 79,615	$ 104,299	$ 159,498	$ 182,215
Noncontrolling interest-common units of the Operating Partnership	(9,509)	(12,117)	(19,009)	(21,169)
Noncontrolling interest in property partnerships	(17,825)	(19,768)	(35,046)	(38,428)
Interest expense	(149,642)	(142,473)	(311,533)	(276,680)
Gain (Loss) from interest rate contracts	0		0
Company's share of net operating income from joint ventures	(508,717)	(503,489)	(1,017,537)	(994,495)
Income (loss) from unconsolidated joint ventures	5,799	6,668	(13,387)	14,237
Depreciation and amortization expense	(219,542)	(202,577)	(438,258)	(411,311)
Transaction costs	(189)	(308)	(702)	(1,219)
General and administrative expense	(44,109)	(44,175)	(94,127)	(99,977)
Unrealized gain on non-real estate investments	(58)	(124)	(454)	(383)
Gains from investments in securities	(315)	(1,571)	(2,587)	(3,236)
Interest and other income (loss)	(10,788)	(17,343)	(25,317)	(28,284)
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the Company	79,615	104,299	159,498	182,215
Noncontrolling interest-common units of the Operating Partnership	9,509	12,117	19,009	21,169
Noncontrolling interest in property partnerships	17,825	19,768	35,046	38,428
Interest expense	149,642	142,473	311,533	276,680
Impairment loss	0	0	13,615	0
Income (loss) from unconsolidated joint ventures	(5,799)	(6,668)	13,387	(14,237)
Depreciation and amortization expense	219,542	202,577	438,258	411,311
Transaction costs	189	308	702	1,219
Operating expense	4,148	4,609	8,441	9,844
General and administrative expense	44,109	44,175	94,127	99,977
Unrealized gain on non-real estate investments	58	124	454	383
Gains from investments in securities	315	1,571	2,587	3,236
Interest and other income (loss)	10,788	17,343	25,317	28,284
Other revenue	4,148	4,609	8,441	9,844
Company's share of Net Operating Income	492,913	497,785	990,593	982,450
Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the Company	90,827	118,098	181,907	206,928
Noncontrolling interest in property partnerships	(17,825)	(19,768)	(35,046)	(38,428)
Interest expense	(149,642)	(142,473)	(311,533)	(276,680)
Income (loss) from unconsolidated joint ventures	5,799	6,668	(13,387)	14,237
Depreciation and amortization expense	(217,839)	(200,895)	(434,858)	(407,767)
Transaction costs	(189)	(308)	(702)	(1,219)
General and administrative expense	(44,109)	(44,175)	(94,127)	(99,977)
Unrealized gain on non-real estate investments	(58)	(124)	(454)	(383)
Gains from investments in securities	(315)	(1,571)	(2,587)	(3,236)
Interest and other income (loss)	(10,788)	(17,343)	(25,317)	(28,284)
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	90,827	118,098	181,907	206,928
Noncontrolling interest in property partnerships	17,825	19,768	35,046	38,428
Interest expense	149,642	142,473	311,533	276,680
Impairment loss	0	0	13,615	0
Income (loss) from unconsolidated joint ventures	(5,799)	(6,668)	13,387	(14,237)
Depreciation and amortization expense	217,839	200,895	434,858	407,767
Transaction costs	189	308	702	1,219
Operating expense	4,148	4,609	8,441	9,844
General and administrative expense	44,109	44,175	94,127	99,977
Unrealized gain on non-real estate investments	58	124	454	383
Gains from investments in securities	315	1,571	2,587	3,236
Interest and other income (loss)	10,788	17,343	25,317	28,284
Other revenue	4,148	4,609	8,441	9,844
Company's share of Net Operating Income	492,913	497,785	990,593	982,450
Unconsolidated Joint Ventures [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest expense	(43,299)	(58,799)	(86,862)	(116,049)
Losses from early extinguishment of debt	0	3	0	3
Company's share of net operating income from joint ventures	(31,587)	(42,254)	(67,017)	(83,010)
Income (loss) from unconsolidated joint ventures	5,799	6,668	(13,387)	14,237
Depreciation and amortization expense	(38,396)	(51,233)	(77,819)	(101,211)
Transaction costs	(5)	(27)	(8)	(101)
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	31,587	42,254
Management Service [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	(6,352)	(9,858)	(12,506)	(18,838)
Management Service [Member] \| Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	6,352	9,858	12,506	18,838
Management Service [Member] \| Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	(6,352)	(9,858)	(12,506)	(18,838)
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	6,352	9,858	12,506	18,838
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	47,391	47,958	93,961	95,055
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	47,391	47,958	93,961	95,055
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	$ 47,391	$ 47,958	$ 93,961	$ 95,055

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

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