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Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 19, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |
Net income attributable to the company's common shareholders / unitholders |  | $ 111,882,000 | $ 184,537,000 | $ 848,947,000 | $ 496,223,000 | $ 862,227,000 |
Preferred Stock Redemption Charge |  |  |  | 0 | (6,412,000) | 0 |
Preferred dividends / distributions |  |  |  | 0 | (2,560,000) | (10,500,000) |
Noncontrolling interest-common units of the Operating Partnership |  |  |  | (96,780,000) | (55,931,000) | (97,704,000) |
Noncontrolling interest in property partnerships |  |  |  | (74,857,000) | (70,806,000) | (48,260,000) |
Interest expense |  |  |  | (437,139,000) | (423,346,000) | (431,717,000) |
Losses from early extinguishment of debt |  |  |  | 0 | 45,182,000 | 0 |
Unrealized Gain (Loss) on Investments |  |  |  | 150,000 | 0 | 0 |
Company's share of net operating income from joint ventures |  |  |  | (1,929,527,000) | (1,814,288,000) | (1,694,075,000) |
Loss from unconsolidated joint ventures |  |  |  | 59,840,000 | 2,570,000 | 85,110,000 |
Depreciation and amortization expense |  |  |  | (749,775,000) | (717,336,000) | (683,751,000) |
Transaction costs |  |  |  | (2,905,000) | (5,036,000) | (1,531,000) |
General and administrative expense |  |  |  | (146,378,000) | (151,573,000) | (133,112,000) |
Gains (losses) from investments in securities |  |  |  | 6,453,000 | (5,626,000) | (5,261,000) |
Other Income - assignment fee |  |  |  | (6,624,000) | 0 | 0 |
Interest and other income (loss) |  |  |  | (11,940,000) | (5,704,000) | (5,953,000) |
Sales-type and Direct Financing Leases, Profit (Loss) | $ (10,100,000) |  |  | (10,058,000) | 0 | 0 |
Gains on sales of real estate |  |  |  | (437,019,000) | (123,660,000) | (618,982,000) |
Segment Reconciling Items |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |
Net income attributable to the company's common shareholders / unitholders |  |  |  | 848,947,000 | 496,223,000 | 862,227,000 |
Preferred Stock Redemption Charge |  |  |  | 0 | 6,412,000 | 0 |
Preferred dividends / distributions |  |  |  | 0 | 2,560,000 | 10,500,000 |
Noncontrolling interest-common units of the Operating Partnership |  |  |  | 96,780,000 | 55,931,000 | 97,704,000 |
Noncontrolling interest in property partnerships |  |  |  | 74,857,000 | 70,806,000 | 48,260,000 |
Interest expense |  |  |  | 437,139,000 | 423,346,000 | 431,717,000 |
Losses from early extinguishment of debt |  |  |  | 0 | 45,182,000 | 0 |
Unrealized Gain (Loss) on Investments |  |  |  | 150,000 | 0 | 0 |
Loss from unconsolidated joint ventures |  |  |  | 59,840,000 | 2,570,000 | 85,110,000 |
Depreciation and amortization expense |  |  |  | 749,775,000 | 717,336,000 | 683,751,000 |
Transaction costs |  |  |  | 2,905,000 | 5,036,000 | 1,531,000 |
Operating expense |  |  |  | 15,450,000 | 12,487,000 | 11,626,000 |
General and administrative expense |  |  |  | 146,378,000 | 151,573,000 | 133,112,000 |
Gains (losses) from investments in securities |  |  |  | (6,453,000) | 5,626,000 | 5,261,000 |
Other Income - assignment fee |  |  |  | 6,624,000 | 0 | 0 |
Interest and other income (loss) |  |  |  | 11,940,000 | 5,704,000 | 5,953,000 |
Sales-type and Direct Financing Leases, Profit (Loss) |  |  |  | (10,058,000) | 0 | 0 |
Gains on sales of real estate |  |  |  | 437,019,000 | 123,660,000 | 618,982,000 |
Other revenue |  |  |  | 15,450,000 | 12,487,000 | 11,626,000 |
Company's share of Net Operating Income |  |  |  | 1,883,796,000 | 1,735,740,000 | 1,626,131,000 |
Unconsolidated Joint Ventures [Member] |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |
Interest expense |  |  |  | (154,065,000) | (108,884,000) | (98,051,000) |
Losses from early extinguishment of debt |  |  |  | 1,327,000 | 0 | 0 |
Company's share of net operating income from joint ventures |  |  |  | (146,081,000) | (107,756,000) | (94,943,000) |
Loss from unconsolidated joint ventures |  |  |  | 59,840,000 | 2,570,000 | 85,110,000 |
Depreciation and amortization expense |  |  |  | (181,041,000) | (147,121,000) | (141,853,000) |
Transaction costs |  |  |  | (837,000) | (470,000) | (1,027,000) |
Gains on sales of real estate |  |  |  | 0 | 0 | (11,737,000) | [1]
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 |  |  |  |  |  | 94,943,000 |
Boston Properties Limited Partnership |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |
Net income attributable to the company's common shareholders / unitholders |  |  |  | 957,265,000 | 561,993,000 | 979,979,000 |
Preferred Stock Redemption Charge |  |  |  | 0 | (6,412,000) | 0 |
Preferred dividends / distributions |  |  |  | 0 | (2,560,000) | (10,500,000) |
Noncontrolling interest in property partnerships |  |  |  | (74,857,000) | (70,806,000) | (48,260,000) |
Interest expense |  |  |  | (437,139,000) | (423,346,000) | (431,717,000) |
Losses from early extinguishment of debt |  |  |  | 0 | 45,182,000 | 0 |
Unrealized Gain (Loss) on Investments |  |  |  | 150,000 | 0 | 0 |
Loss from unconsolidated joint ventures |  |  |  | 59,840,000 | 2,570,000 | 85,110,000 |
Depreciation and amortization expense |  |  |  | (742,293,000) | (709,035,000) |  |
Transaction costs |  |  |  | (2,905,000) | (5,036,000) | (1,531,000) |
General and administrative expense |  |  |  | (146,378,000) | (151,573,000) | (133,112,000) |
Gains (losses) from investments in securities |  |  |  | 6,453,000 | (5,626,000) | (5,261,000) |
Other Income - assignment fee |  |  |  | (6,624,000) | 0 | 0 |
Interest and other income (loss) |  |  |  | (11,940,000) | (5,704,000) | (5,953,000) |
Sales-type and Direct Financing Leases, Profit (Loss) |  |  |  | (10,058,000) | 0 | 0 |
Gains on sales of real estate |  |  |  | (441,075,000) | (125,198,000) | (631,945,000) |
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's common shareholders / unitholders |  |  |  | 957,265,000 | 561,993,000 | 979,979,000 |
Preferred Stock Redemption Charge |  |  |  | 0 | 6,412,000 | 0 |
Preferred dividends / distributions |  |  |  | 0 | 2,560,000 | 10,500,000 |
Noncontrolling interest in property partnerships |  |  |  | 74,857,000 | 70,806,000 | 48,260,000 |
Interest expense |  |  |  | 437,139,000 | 423,346,000 | 431,717,000 |
Losses from early extinguishment of debt |  |  |  | 0 | 45,182,000 | 0 |
Unrealized Gain (Loss) on Investments |  |  |  | 150,000 | 0 | 0 |
Loss from unconsolidated joint ventures |  |  |  | 59,840,000 | 2,570,000 | 85,110,000 |
Depreciation and amortization expense |  |  |  | 742,293,000 | 709,035,000 | 676,666,000 |
Transaction costs |  |  |  | 2,905,000 | 5,036,000 | 1,531,000 |
Operating expense |  |  |  | 15,450,000 | 12,487,000 | 11,626,000 |
General and administrative expense |  |  |  | 146,378,000 | 151,573,000 | 133,112,000 |
Gains (losses) from investments in securities |  |  |  | (6,453,000) | 5,626,000 | 5,261,000 |
Other Income - assignment fee |  |  |  | 6,624,000 | 0 | 0 |
Interest and other income (loss) |  |  |  | 11,940,000 | 5,704,000 | 5,953,000 |
Sales-type and Direct Financing Leases, Profit (Loss) |  |  |  | (10,058,000) | 0 | 0 |
Gains on sales of real estate |  |  |  | 441,075,000 | 125,198,000 | 631,945,000 |
Other revenue |  |  |  | 15,450,000 | 12,487,000 | 11,626,000 |
Company's share of Net Operating Income |  |  |  | 1,883,796,000 | 1,735,740,000 | 1,626,131,000 |
Management Service [Member] |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |
Other revenue |  |  |  | (28,056,000) | (27,697,000) | (29,641,000) |
Management Service [Member] | Segment Reconciling Items |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |
Other revenue |  |  |  | 28,056,000 | 27,697,000 | 29,641,000 |
Management Service [Member] | Boston Properties Limited Partnership |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |
Other revenue |  |  |  | (28,056,000) | (27,697,000) | (29,641,000) |
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 |  |  |  | 28,056,000 | 27,697,000 | 29,641,000 |
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 |  |  |  | 191,812,000 | 186,304,000 | 162,887,000 |
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 |  |  |  | 191,812,000 | 186,304,000 | 162,887,000 |
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 |  |  |  | $ 191,812,000 | $ 186,304,000 | $ 162,887,000 |
[1] | For the year ended December 31, 2020, represents the gain on sale of Annapolis Junction Building Eight and two land parcels. The gain on sale of real estate is included in Loss from Unconsolidated Joint Ventures in the Company’s Consolidated Statements of Operations.

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