Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gains on sales of real estate	$ 602	$ 517	$ 437,019
Gain on sales-type lease	0	0	10,058
Interest and Other Income	60,199	69,964	11,940
Other Income - assignment fee	0	0	6,624
Gains (losses) from investments in securities	4,416	5,556	(6,453)
Unrealized gain (loss) on non-real estate investments	546	239	(150)
Company's share of net operating income from joint ventures	2,041,045	1,998,776	1,929,527
General and administrative expense	(159,983)	(170,158)	(146,378)
Transaction costs	(1,597)	(4,313)	(2,905)
Depreciation and amortization expense	(887,191)	(830,813)	(749,775)
Income (Loss) from Equity Method Investments	343,177	239,543	59,840
Losses from interest rate contracts	0	79	0
Interest expense	(645,117)	(579,572)	(437,139)
Net Income	84,188	291,424	1,020,584
Noncontrolling Interest in Net Income (Loss) Limited Partnerships, Nonredeemable	67,516	78,661	74,857
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable	2,400	22,548	96,780
Net income attributable to the Company	14,272	190,215	848,947
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Company's share of Net Operating Income	1,984,056	1,965,106	1,883,796
Other revenue	16,488	17,771	15,450
Gains on sales of real estate	602	517	437,019
Gain on sales-type lease	0	0	10,058
Interest and Other Income	60,199	69,964	11,940
Other Income - assignment fee	0	0	6,624
Gains (losses) from investments in securities	4,416	5,556	(6,453)
Unrealized gain (loss) on non-real estate investments	546	239	(150)
General and administrative expense	159,983	170,158	146,378
Operating expense	16,488	17,771	15,450
Transaction costs	1,597	4,313	2,905
Depreciation and amortization expense	887,191	830,813	749,775
Income (Loss) from Equity Method Investments	343,177	239,543	59,840
Losses from interest rate contracts	0	79	0
Impairment loss	13,615	0	0
Interest expense	645,117	579,572	437,139
Net Income	84,188	291,424	1,020,584
Noncontrolling Interest in Net Income (Loss) Limited Partnerships, Nonredeemable	67,516	78,661	74,857
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable	2,400	22,548	96,780
Net income attributable to the Company	14,272	190,215	848,947
Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gains on sales of real estate	602	517	441,075
Gain on sales-type lease	0	0	10,058
Interest and Other Income	60,199	69,964	11,940
Other Income - assignment fee	0	0	6,624
Gains (losses) from investments in securities	4,416	5,556	(6,453)
Unrealized gain (loss) on non-real estate investments	546	239	(150)
General and administrative expense	(159,983)	(170,158)	(146,378)
Transaction costs	(1,597)	(4,313)	(2,905)
Depreciation and amortization expense	(880,383)	(823,805)	(742,293)
Income (Loss) from Equity Method Investments	343,177	239,543	59,840
Losses from interest rate contracts	0	79	0
Interest expense	(645,117)	(579,572)	(437,139)
Net Income	90,996	298,432	1,032,122
Noncontrolling Interest in Net Income (Loss) Limited Partnerships, Nonredeemable	67,516	78,661	74,857
Net income attributable to the Company	23,480	219,771	957,265
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	1,984,056	1,965,106	1,883,796
Other revenue	16,488	17,771	15,450
Gains on sales of real estate	602	517	441,075
Gain on sales-type lease	0	0	10,058
Interest and Other Income	60,199	69,964	11,940
Other Income - assignment fee	0	0	6,624
Gains (losses) from investments in securities	4,416	5,556	(6,453)
Unrealized gain (loss) on non-real estate investments	546	239	(150)
General and administrative expense	159,983	170,158	146,378
Operating expense	16,488	17,771	15,450
Transaction costs	1,597	4,313	2,905
Depreciation and amortization expense	880,383	823,805	742,293
Income (Loss) from Equity Method Investments	343,177	239,543	59,840
Losses from interest rate contracts	0	79	0
Impairment loss	13,615	0	0
Interest expense	645,117	579,572	437,139
Net Income	90,996	298,432	1,032,122
Noncontrolling Interest in Net Income (Loss) Limited Partnerships, Nonredeemable	67,516	78,661	74,857
Net income attributable to the Company	23,480	219,771	957,265
Unconsolidated Joint Ventures [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gain on sales-type lease	0	2,737	0
Company's share of net operating income from joint ventures	129,718	160,695	146,081
Transaction costs	(456)	(301)	(837)
Depreciation and amortization expense	(160,756)	(197,228)	(181,041)
Income (Loss) from Equity Method Investments	343,177	239,543	59,840
Interest expense	(176,994)	(227,537)	(154,065)
Loss from early extinguishment of debt	0	3	1,327
Net Income	(29,583)	(56,272)	(22,143)
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	129,718	160,695	146,081
Management Service [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	28,060	40,850	28,056
Management Service [Member] \| Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	28,060	40,850	28,056
Management Service [Member] \| Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	28,060	40,850	28,056
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	28,060	40,850	28,056
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	(186,707)	(194,365)	(191,812)
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	$ 186,707	$ 194,365	$ 191,812

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

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