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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

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