Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the Company common shareholders / unitholders	$ 190,215	$ 848,947	$ 496,223
Preferred Stock Redemption Charge	0	0	(6,412)
Preferred dividends / distributions	0	0	(2,560)
Noncontrolling interest-common units of the Operating Partnership	(22,548)	(96,780)	(55,931)
Noncontrolling interest in property partnerships	(78,661)	(74,857)	(70,806)
Interest expense	(579,572)	(437,139)	(423,346)
Losses from early extinguishment of debt	0	0	45,182
Losses from interest rate contracts	79	0	0
Company's share of net operating income from joint ventures	(1,998,776)	(1,929,527)	(1,814,288)
Loss from unconsolidated joint ventures	239,543	59,840	2,570
Depreciation and amortization expense	(830,813)	(749,775)	(717,336)
Transaction costs	(4,313)	(2,905)	(5,036)
General and administrative expense	(170,158)	(146,378)	(151,573)
Unrealized Gain (Loss) on Investments	(239)	150	0
Gains (losses) from investments in securities	(5,556)	6,453	(5,626)
Other Income - assignment fee	0	(6,624)	0
Interest and other income (loss)	(69,964)	(11,940)	(5,704)
Gain on sales-type lease	0	(10,058)	0
Gains on sales of real estate	(517)	(437,019)	(123,660)
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the Company common shareholders / unitholders	190,215	848,947	496,223
Preferred Stock Redemption Charge	0	0	6,412
Preferred dividends / distributions	0	0	2,560
Noncontrolling interest-common units of the Operating Partnership	22,548	96,780	55,931
Noncontrolling interest in property partnerships	78,661	74,857	70,806
Interest expense	579,572	437,139	423,346
Losses from early extinguishment of debt	0	0	45,182
Losses from interest rate contracts	79	0	0
Loss from unconsolidated joint ventures	239,543	59,840	2,570
Depreciation and amortization expense	830,813	749,775	717,336
Transaction costs	4,313	2,905	5,036
Operating expense	17,771	15,450	12,487
General and administrative expense	170,158	146,378	151,573
Unrealized Gain (Loss) on Investments	239	(150)	0
Gains (losses) from investments in securities	5,556	(6,453)	5,626
Other Income - assignment fee	0	6,624	0
Interest and other income (loss)	69,964	11,940	5,704
Gain on sales-type lease	0	10,058	0
Gains on sales of real estate	517	437,019	123,660
Other revenue	17,771	15,450	12,487
Company's share of Net Operating Income	1,965,106	1,883,796	1,735,740
Unconsolidated Joint Ventures [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest expense	(227,537)	(154,065)	(108,884)
Losses from early extinguishment of debt	3	1,327	0
Company's share of net operating income from joint ventures			(107,756)
Loss from unconsolidated joint ventures	239,543	59,840	2,570
Depreciation and amortization expense	(197,228)	(181,041)	(147,121)
Transaction costs	(301)	(837)	(470)
Gain on sales-type lease	(2,737)	0	0
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	160,695	146,081	107,756
Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income attributable to the Company common shareholders / unitholders	219,771	957,265	561,993
Preferred Stock Redemption Charge	0	0	(6,412)
Preferred dividends / distributions	0	0	(2,560)
Noncontrolling interest in property partnerships	(78,661)	(74,857)	(70,806)
Interest expense	(579,572)	(437,139)	(423,346)
Losses from early extinguishment of debt	0	0	45,182
Losses from interest rate contracts	79	0	0
Loss from unconsolidated joint ventures	239,543	59,840	2,570
Depreciation and amortization expense	(823,805)	(742,293)
Transaction costs	(4,313)	(2,905)	(5,036)
General and administrative expense	(170,158)	(146,378)	(151,573)
Unrealized Gain (Loss) on Investments	(239)	150	0
Gains (losses) from investments in securities	(5,556)	6,453	(5,626)
Other Income - assignment fee	0	(6,624)	0
Interest and other income (loss)	(69,964)	(11,940)	(5,704)
Gain on sales-type lease	0	(10,058)	0
Gains on sales of real estate	(517)	(441,075)	(125,198)
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 common shareholders / unitholders	219,771	957,265	561,993
Preferred Stock Redemption Charge	0	0	6,412
Preferred dividends / distributions	0	0	2,560
Noncontrolling interest in property partnerships	78,661	74,857	70,806
Interest expense	579,572	437,139	423,346
Losses from early extinguishment of debt	0	0	45,182
Losses from interest rate contracts	79	0	0
Loss from unconsolidated joint ventures	239,543	59,840	2,570
Depreciation and amortization expense	823,805	742,293	709,035
Transaction costs	4,313	2,905	5,036
Operating expense	17,771	15,450	12,487
General and administrative expense	170,158	146,378	151,573
Unrealized Gain (Loss) on Investments	239	(150)	0
Gains (losses) from investments in securities	5,556	(6,453)	5,626
Other Income - assignment fee	0	6,624	0
Interest and other income (loss)	69,964	11,940	5,704
Gain on sales-type lease	0	10,058	0
Gains on sales of real estate	517	441,075	125,198
Other revenue	17,771	15,450	12,487
Company's share of Net Operating Income	1,965,106	1,883,796	1,735,740
Management Service [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	(40,850)	(28,056)	(27,697)
Management Service [Member] | Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	40,850	28,056	27,697
Management Service [Member] | Boston Properties Limited Partnership
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other revenue	(40,850)	(28,056)	(27,697)
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	40,850	28,056	27,697
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	194,365	191,812	186,304
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	194,365	191,812	186,304
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	$ 194,365	$ 191,812	$ 186,304