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Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Net income attributable to the Company | $ 83,628 | $ (111,826) | $ 243,126 | $ 70,290
Noncontrolling interest-common units of the Operating Partnership | (9,587) | 12,626 | (28,596) | (8,642)
Noncontrolling interest in property partnerships | (15,237) | (20,909) | (50,283) | (59,337)
Interest expense | (163,194) | (147,812) | (474,727) | (424,492)
Gain (Loss) from interest rate contracts | 0 | 0 | 0 | 0
Company's share of net operating income from joint ventures | (511,078) | (501,881) | (1,528,615) | (1,496,376)
Depreciation and amortization expense | (222,890) | (207,435) | (661,148) | (618,746)
Transaction costs | (188) | (751) | (890) | (1,970)
General and administrative expense | (33,352) | (31,410) | (127,479) | (131,387)
Unrealized gain (loss) on non-real estate investments | (94) | 51 | (548) | (332)
Gains (losses) from investments in securities | (2,198) | 925 | (4,785) | (2,311)
Interest and other income (loss) | (14,430) | (20,715) | (39,747) | (48,999)
Gains on sales of real estate | (517) | (517) | (517) | (517)
Income (loss) from unconsolidated joint ventures | 7,011 | 247,556 | (6,376) | 261,793
Segment Reconciling Items |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Net income attributable to the Company | 83,628 | (111,826) | 243,126 | 70,290
Noncontrolling interest-common units of the Operating Partnership | 9,587 | (12,626) | 28,596 | 8,642
Noncontrolling interest in property partnerships | 15,237 | 20,909 | 50,283 | 59,337
Interest expense | 163,194 | 147,812 | 474,727 | 424,492
Impairment loss | 0 | 0 | 13,615 | 0
Depreciation and amortization expense | 222,890 | 207,435 | 661,148 | 618,746
Transaction costs | 188 | 751 | 890 | 1,970
Operating expense | 3,649 | 3,906 | 12,090 | 13,750
General and administrative expense | 33,352 | 31,410 | 127,479 | 131,387
Unrealized gain (loss) on non-real estate investments | 94 | (51) | 548 | 332
Gains (losses) from investments in securities | 2,198 | (925) | 4,785 | 2,311
Interest and other income (loss) | 14,430 | 20,715 | 39,747 | 48,999
Gains on sales of real estate | 517 | 517 | 517 | 517
Income (loss) from unconsolidated joint ventures | (7,011) | (247,556) | 6,376 | (261,793)
Other revenue | 3,649 | 3,906 | 12,090 | 13,750
Company's share of Net Operating Income | 498,510 | 490,999 | 1,489,103 | 1,473,449
Boston Properties Limited Partnership |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Net income attributable to the Company | 94,919 | (122,696) | 276,826 | 84,232
Noncontrolling interest in property partnerships | (15,237) | (20,909) | (50,283) | (59,337)
Interest expense | (163,194) | (147,812) | (474,727) | (424,492)
Depreciation and amortization expense | (221,186) | (205,679) | (656,044) | (613,446)
Transaction costs | (188) | (751) | (890) | (1,970)
General and administrative expense | (33,352) | (31,410) | (127,479) | (131,387)
Unrealized gain (loss) on non-real estate investments | (94) | 51 | (548) | (332)
Gains (losses) from investments in securities | (2,198) | 925 | (4,785) | (2,311)
Interest and other income (loss) | (14,430) | (20,715) | (39,747) | (48,999)
Gains on sales of real estate | (517) | (517) | (517) | (517)
Income (loss) from unconsolidated joint ventures | 7,011 | 247,556 | (6,376) | 261,793
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 | 94,919 | (122,696) | 276,826 | 84,232
Noncontrolling interest in property partnerships | 15,237 | 20,909 | 50,283 | 59,337
Interest expense | 163,194 | 147,812 | 474,727 | 424,492
Impairment loss | 0 | 0 | 13,615 | 0
Depreciation and amortization expense | 221,186 | 205,679 | 656,044 | 613,446
Transaction costs | 188 | 751 | 890 | 1,970
Operating expense | 3,649 | 3,906 | 12,090 | 13,750
General and administrative expense | 33,352 | 31,410 | 127,479 | 131,387
Unrealized gain (loss) on non-real estate investments | 94 | (51) | 548 | 332
Gains (losses) from investments in securities | 2,198 | (925) | 4,785 | 2,311
Interest and other income (loss) | 14,430 | 20,715 | 39,747 | 48,999
Gains on sales of real estate | 517 | 517 | 517 | 517
Income (loss) from unconsolidated joint ventures | (7,011) | (247,556) | 6,376 | (261,793)
Other revenue | 3,649 | 3,906 | 12,090 | 13,750
Company's share of Net Operating Income | 498,510 | 490,999 | 1,489,103 | 1,473,449
Unconsolidated Joint Ventures [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Interest expense | (45,244) | (60,737) | (132,106) | (176,786)
Losses from early extinguishment of debt | 0 | 0 | 0 | 3
Company's share of net operating income from joint ventures | (31,919) | (39,165) | (98,936) | (122,175)
Depreciation and amortization expense | (41,082) | (49,840) | (118,901) | (151,051)
Transaction costs | (53) | (78) | (61) | (179)
Income (loss) from unconsolidated joint ventures | 7,011 | 247,556 | (6,376) | 261,793
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 | 31,919 | 39,165 | 98,936 | 122,175
Management Service [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Other revenue | (6,770) | (9,284) | (19,276) | (28,122)
Management Service [Member] | Segment Reconciling Items |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Other revenue | 6,770 | 9,284 | 19,276 | 28,122
Management Service [Member] | Boston Properties Limited Partnership |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Other revenue | (6,770) | (9,284) | (19,276) | (28,122)
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 | 6,770 | 9,284 | 19,276 | 28,122
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 | 44,487 | 50,047 | 138,448 | 145,102
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 | 44,487 | 50,047 | 138,448 | 145,102
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 | $ 44,487 | $ 50,047 | $ 138,448 | $ 145,102

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