Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the Company	$ 79,883	$ 77,890
Noncontrolling interest-common units of the Operating Partnership	(9,500)	(9,078)
Noncontrolling interest in property partnerships	(17,221)	(18,660)
Interest expense	(161,891)	(134,207)
Gain (Loss) from interest rate contracts	0
Company's share of net operating income from joint ventures	(508,820)	(491,006)
Income (loss) from unconsolidated joint ventures	(19,186)	7,569
Depreciation and amortization expense	(218,716)	(208,734)
Transaction costs	(513)	(911)
General and administrative expense	(50,018)	(55,802)
Unrealized gain on non-real estate investments	(396)	(259)
Gains from investments in securities	(2,272)	(1,665)
Interest and other income (loss)	(14,529)	(10,941)
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the Company	79,883	77,890
Noncontrolling interest-common units of the Operating Partnership	9,500	9,078
Noncontrolling interest in property partnerships	17,221	18,660
Interest expense	161,891	134,207
Impairment loss	13,615	0
Income (loss) from unconsolidated joint ventures	19,186	(7,569)
Depreciation and amortization expense	218,716	208,734
Transaction costs	513	911
Operating expense	4,293	5,235
General and administrative expense	50,018	55,802
Unrealized gain on non-real estate investments	396	259
Gains from investments in securities	2,272	1,665
Interest and other income (loss)	14,529	10,941
Other revenue	4,293	5,235
Company's share of Net Operating Income	497,680	484,665
Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the Company	91,080	88,830
Noncontrolling interest in property partnerships	(17,221)	(18,660)
Interest expense	(161,891)	(134,207)
Income (loss) from unconsolidated joint ventures	(19,186)	7,569
Depreciation and amortization expense	(217,019)	(206,872)
Transaction costs	(513)	(911)
General and administrative expense	(50,018)	(55,802)
Unrealized gain on non-real estate investments	(396)	(259)
Gains from investments in securities	(2,272)	(1,665)
Interest and other income (loss)	(14,529)	(10,941)
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	91,080	88,830
Noncontrolling interest in property partnerships	17,221	18,660
Interest expense	161,891	134,207
Impairment loss	13,615	0
Income (loss) from unconsolidated joint ventures	19,186	(7,569)
Depreciation and amortization expense	217,019	206,872
Transaction costs	513	911
Operating expense	4,293	5,235
General and administrative expense	50,018	55,802
Unrealized gain on non-real estate investments	396	259
Gains from investments in securities	2,272	1,665
Interest and other income (loss)	14,529	10,941
Other revenue	4,293	5,235
Company's share of Net Operating Income	497,680	484,665
Unconsolidated Joint Ventures [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest expense	(43,563)	(57,250)
Company's share of net operating income from joint ventures	(35,430)	(40,756)
Income (loss) from unconsolidated joint ventures	(19,186)	7,569
Depreciation and amortization expense	(39,424)	(49,978)
Transaction costs	(2)	(74)
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	35,430	40,756
Management Service [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	(6,154)	(8,980)
Management Service [Member] | Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	6,154	8,980
Management Service [Member] | Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	(6,154)	(8,980)
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	6,154	8,980
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	46,570	47,097
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	46,570	47,097
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	$ 46,570	$ 47,097