Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Equity Method Investments	$ 2,139	$ (19,186)
Interest and Other Income	7,750	14,529
Gains (losses) from investments in securities	(365)	2,272
Unrealized gain (loss) on non-real estate investments	(483)	396
Company's share of net operating income from joint ventures	511,798	508,820
General and administrative expense	(52,284)	(50,018)
Transaction costs	(768)	(513)
Depreciation and amortization expense	(220,107)	(218,716)
Loss on sales-type lease	2,490	0
Loss from early extinguishment of debt	338	0
Interest expense	(163,444)	(161,891)
Net Income	86,905	106,604
Noncontrolling Interest in Net Income (Loss) Limited Partnerships, Nonredeemable	18,749	17,221
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable	6,979	9,500
Net income attributable to the Company	61,177	79,883
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Company's share of Net Operating Income	494,778	497,680
Other revenue	4,499	4,293
Income (Loss) from Equity Method Investments	(2,139)	19,186
Interest and Other Income	7,750	14,529
Gains (losses) from investments in securities	(365)	2,272
Unrealized gain (loss) on non-real estate investments	(483)	396
General and administrative expense	52,284	50,018
Operating expense	4,499	4,293
Transaction costs	768	513
Depreciation and amortization expense	220,107	218,716
Loss on sales-type lease	2,490	0
Impairment loss	0	13,615
Loss from early extinguishment of debt	338	0
Interest expense	163,444	161,891
Net Income	86,905	106,604
Noncontrolling Interest in Net Income (Loss) Limited Partnerships, Nonredeemable	18,749	17,221
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable	6,979	9,500
Net income attributable to the Company	61,177	79,883
Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Equity Method Investments	2,139	(19,186)
Interest and Other Income	7,750	14,529
Gains (losses) from investments in securities	(365)	2,272
Unrealized gain (loss) on non-real estate investments	(483)	396
General and administrative expense	(52,284)	(50,018)
Transaction costs	(768)	(513)
Depreciation and amortization expense	(218,404)	(217,019)
Loss on sales-type lease	2,490	0
Loss from early extinguishment of debt	338	0
Interest expense	(163,444)	(161,891)
Net Income	88,608	108,301
Noncontrolling Interest in Net Income (Loss) Limited Partnerships, Nonredeemable	18,749	17,221
Net income attributable to the Company	69,859	91,080
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	494,778	497,680
Other revenue	4,499	4,293
Income (Loss) from Equity Method Investments	(2,139)	19,186
Interest and Other Income	7,750	14,529
Gains (losses) from investments in securities	(365)	2,272
Unrealized gain (loss) on non-real estate investments	(483)	396
General and administrative expense	52,284	50,018
Operating expense	4,499	4,293
Transaction costs	768	513
Depreciation and amortization expense	218,404	217,019
Loss on sales-type lease	2,490	0
Impairment loss	0	13,615
Loss from early extinguishment of debt	338	0
Interest expense	163,444	161,891
Net Income	88,608	108,301
Noncontrolling Interest in Net Income (Loss) Limited Partnerships, Nonredeemable	18,749	17,221
Net income attributable to the Company	69,859	91,080
Unconsolidated Joint Ventures [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Equity Method Investments	2,139	(19,186)
Company's share of net operating income from joint ventures	32,682	35,430
Transaction costs	(170)	(2)
Depreciation and amortization expense	(42,379)	(39,424)
Loss from early extinguishment of debt	62	0
Interest expense	(44,432)	(43,563)
Net Income	(18,410)	8,321
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	32,682	35,430
Management Service [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	9,775	6,154
Management Service [Member] \| Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	9,775	6,154
Management Service [Member] \| Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	9,775	6,154
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	9,775	6,154
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	(49,702)	(46,570)
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	49,702	46,570
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	$ 49,702	$ 46,570

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

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