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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Income (Loss) from Equity Method Investments | $ 148,329 |  | $ 7,011 | $ 153,792 |  | $ (6,376)
Gains on sales of real estate | 1,932 |  | 517 | 20,322 |  | 517
Interest and Other Income | 7,620 |  | 14,430 | 23,433 |  | 39,747
Gains from investments in securities | 2,400 |  | 2,198 | 4,635 |  | 4,785
Company's share of net operating income from joint ventures | 517,008 |  | 511,078 | 1,542,886 |  | 1,528,615
General and administrative expense | (36,188) |  | (33,352) | (130,988) |  | (127,479)
Transaction costs | (1,431) |  | (188) | (2,556) |  | (890)
Depreciation and amortization expense | (236,147) |  | (222,890) | (680,073) |  | (661,148)
Loss on sales-type lease | 0 |  | 0 | 2,490 |  | 0
Loss from early extinguishment of debt | 0 |  | 0 | 338 |  | 0
Interest expense | (164,299) |  | (163,194) | (490,526) |  | (474,727)
Net income (loss) | (116,840) |  | 108,452 | 89,206 |  | 322,005
Noncontrolling Interest in Net Income (Loss) Limited Partnerships, Nonredeemable | 17,853 |  | 15,237 | 56,702 |  | 50,283
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable | (12,981) |  | 9,587 | 4,054 |  | 28,596
Net income (loss) attributable to BXP, Inc. | (121,712) |  | 83,628 | 28,450 |  | 243,126
Segment Reconciling Items |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Company's share of Net Operating Income | 496,179 |  | 498,510 | 1,484,504 |  | 1,489,103
Other revenue | 3,821 |  | 3,649 | 12,424 |  | 12,090
Income (Loss) from Equity Method Investments | (148,329) |  | (7,011) | (153,792) |  | 6,376
Gains on sales of real estate | 1,932 |  | 517 | 20,322 |  | 517
Interest and Other Income | 7,620 |  | 14,430 | 23,433 |  | 39,747
Gains from investments in securities | 2,400 |  | 2,198 | 4,635 |  | 4,785
Unrealized gain (loss) on non-real estate investments | 178 |  | 94 | (344) |  | 548
General and administrative expense | 36,188 |  | 33,352 | 130,988 |  | 127,479
Operating expense | 3,821 |  | 3,649 | 12,424 |  | 12,090
Transaction costs | 1,431 |  | 188 | 2,556 |  | 890
Depreciation and amortization expense | 236,147 |  | 222,890 | 680,073 |  | 661,148
Loss on sales-type lease | 0 |  | 0 | 2,490 |  | 0
Impairment losses | 68,901 |  | 0 | 68,901 |  | 13,615
Loss from early extinguishment of debt | 0 |  | 0 | 338 |  | 0
Interest expense | 164,299 |  | 163,194 | 490,526 |  | 474,727
Net income (loss) | (116,840) |  | 108,452 | 89,206 |  | 322,005
Noncontrolling Interest in Net Income (Loss) Limited Partnerships, Nonredeemable | 17,853 |  | 15,237 | 56,702 |  | 50,283
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable | (12,981) |  | 9,587 | 4,054 |  | 28,596
Net income (loss) attributable to BXP, Inc. | (121,712) |  | 83,628 | 28,450 |  | 243,126
Boston Properties Limited Partnership |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Income (Loss) from Equity Method Investments | 148,329 |  | 7,011 | 153,792 |  | (6,376)
Gains on sales of real estate | 1,932 |  | 517 | 20,421 |  | 517
Interest and Other Income | 7,620 |  | 14,430 | 23,433 |  | 39,747
Gains from investments in securities | 2,400 |  | 2,198 | 4,635 |  | 4,785
General and administrative expense | (36,188) |  | (33,352) | (130,988) |  | (127,479)
Transaction costs | (1,431) |  | (188) | (2,556) |  | (890)
Depreciation and amortization expense | (234,444) |  | (221,186) | (674,964) |  | (656,044)
Loss on sales-type lease | 0 |  | 0 | 2,490 |  | 0
Loss from early extinguishment of debt | 0 |  | 0 | 338 |  | 0
Interest expense | (164,299) |  | (163,194) | (490,526) |  | (474,727)
Net income (loss) | (112,224) |  | 110,156 | 97,327 |  | 327,109
Noncontrolling Interest in Net Income (Loss) Limited Partnerships, Nonredeemable | 17,853 |  | 15,237 | 56,702 |  | 50,283
Net income (loss) attributable to BXP, Inc. | (130,077) |  | 94,919 | 40,625 |  | 276,826
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 | 496,179 |  | 498,510 | 1,484,504 |  | 1,489,103
Other revenue | 3,821 |  | 3,649 | 12,424 |  | 12,090
Income (Loss) from Equity Method Investments | (148,329) |  | (7,011) | (153,792) |  | 6,376
Gains on sales of real estate | 1,932 |  | 517 | 20,421 |  | 517
Interest and Other Income | 7,620 |  | 14,430 | 23,433 |  | 39,747
Gains from investments in securities | 2,400 |  | 2,198 | 4,635 |  | 4,785
Unrealized gain (loss) on non-real estate investments | 178 |  | 94 | (344) |  | 548
General and administrative expense | 36,188 |  | 33,352 | 130,988 |  | 127,479
Operating expense | 3,821 |  | 3,649 | 12,424 |  | 12,090
Transaction costs | 1,431 |  | 188 | 2,556 |  | 890
Depreciation and amortization expense | 234,444 |  | 221,186 | 674,964 |  | 656,044
Loss on sales-type lease | 0 |  | 0 | 2,490 |  | 0
Impairment losses | 65,988 |  | 0 | 65,988 |  | 13,615
Loss from early extinguishment of debt | 0 |  | 0 | 338 |  | 0
Interest expense | 164,299 |  | 163,194 | 490,526 |  | 474,727
Net income (loss) | (112,224) |  | 110,156 | 97,327 |  | 327,109
Noncontrolling Interest in Net Income (Loss) Limited Partnerships, Nonredeemable | 17,853 |  | 15,237 | 56,702 |  | 50,283
Net income (loss) attributable to BXP, Inc. | (130,077) |  | 94,919 | 40,625 |  | 276,826
Unconsolidated Joint Ventures [Member] |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Income (Loss) from Equity Method Investments | 148,329 |  | 7,011 | 153,792 |  | (6,376)
Gains on sales of real estate | 4,762 | [1] | 0 | 4,762 | [1] | 0
Company's share of net operating income from joint ventures | 30,675 |  | 31,919 | 94,386 |  | 98,936
Transaction costs | (2) |  | (53) | (173) |  | (61)
Depreciation and amortization expense | (45,409) |  | (41,082) | (131,940) |  | (118,901)
Loss from early extinguishment of debt | 0 |  | 0 | 62 |  | 0
Interest expense | (47,202) |  | (45,244) | (136,738) |  | (132,106)
Net income (loss) | (17,642) |  | (30,396) | (59,971) |  | (29,228)
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 | 30,675 |  | 31,919 | 94,386 |  | 98,936
Management Service [Member] |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Other revenue | 9,317 |  | 6,770 | 27,938 |  | 19,276
Management Service [Member] | Segment Reconciling Items |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Other revenue | 9,317 |  | 6,770 | 27,938 |  | 19,276
Management Service [Member] | Boston Properties Limited Partnership |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Other revenue | 9,317 |  | 6,770 | 27,938 |  | 19,276
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 | 9,317 |  | 6,770 | 27,938 |  | 19,276
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 | (51,504) |  | (44,487) | (152,768) |  | (138,448)
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 | 51,504 |  | 44,487 | 152,768 |  | 138,448
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 | $ 51,504 |  | $ 44,487 | $ 152,768 |  | $ 138,448
[1] | During the three and nine months ended September 30, 2025, the joint venture recorded a gain on sale of real estate related to the Beach Cities Media Campus. As a result of the historical basis difference, the Company recognized a gain on sale of real estate totaling approximately $2.2 million, which consists of its share of the gain on sale reported by the joint venture as well as an adjustment for a basis differential.

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