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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, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Gains on sales of real estate | $ 176,732 |  | $ 602 | $ 517
Interest and Other Income | 35,784 |  | 60,199 | 69,964
Gains from investments in securities | 5,481 |  | 4,416 | 5,556
Company's share of net operating income from joint ventures | 2,058,649 |  | 2,041,045 | 1,998,776
General and administrative expense | (168,789) |  | (159,983) | (170,158)
Transaction costs | (2,678) |  | (1,597) | (4,313)
Depreciation and amortization expense | (912,088) |  | (887,191) | (830,813)
Income (Loss) from Equity Method Investments | 103,560 |  | 343,177 | 239,543
Loss on sales-type lease | 2,490 |  | 0 | 0
Losses from interest rate contracts | 0 |  | 0 | 79
Loss from early extinguishment of debt | 338 |  | 0 | 0
Interest expense | (653,138) |  | (645,117) | (579,572)
Net income | 383,995 |  | 84,188 | 291,424
Noncontrolling Interest in Net Income (Loss) Limited Partnerships, Nonredeemable | 75,181 |  | 67,516 | 78,661
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable | 32,014 |  | 2,400 | 22,548
Net income attributable to BXP, Inc. | 276,800 |  | 14,272 | 190,215
Segment Reconciling Items |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Company's share of Net Operating Income | 1,976,785 |  | 1,984,056 | 1,965,106
Other revenue | 16,383 |  | 16,488 | 17,771
Gains on sales of real estate | 176,732 |  | 602 | 517
Interest and Other Income | 35,784 |  | 60,199 | 69,964
Gains from investments in securities | 5,481 |  | 4,416 | 5,556
Unrealized gain (loss) on non-real estate investments | (346) |  | 546 | 239
General and administrative expense | 168,789 |  | 159,983 | 170,158
Operating expense | 16,383 |  | 16,488 | 17,771
Transaction costs | 2,678 |  | 1,597 | 4,313
Depreciation and amortization expense | 912,088 |  | 887,191 | 830,813
Income (Loss) from Equity Method Investments | 103,560 |  | 343,177 | 239,543
Loss on sales-type lease | 2,490 |  | 0 | 0
Losses from interest rate contracts | 0 |  | 0 | 79
Impairment losses | 85,803 |  | 13,615 | 0
Loss from early extinguishment of debt | 338 |  | 0 | 0
Interest expense | 653,138 |  | 645,117 | 579,572
Net income | 383,995 |  | 84,188 | 291,424
Noncontrolling Interest in Net Income (Loss) Limited Partnerships, Nonredeemable | 75,181 |  | 67,516 | 78,661
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable | 32,014 |  | 2,400 | 22,548
Net income attributable to BXP, Inc. | 276,800 |  | 14,272 | 190,215
Boston Properties Limited Partnership |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Gains on sales of real estate | 179,322 |  | 602 | 517
Interest and Other Income | 35,784 |  | 60,199 | 69,964
Gains from investments in securities | 5,481 |  | 4,416 | 5,556
General and administrative expense | (168,789) |  | (159,983) | (170,158)
Transaction costs | (2,678) |  | (1,597) | (4,313)
Depreciation and amortization expense | (905,301) |  | (880,383) |
Income (Loss) from Equity Method Investments | 103,560 |  | 343,177 | 239,543
Loss on sales-type lease | 2,490 |  | 0 | 0
Losses from interest rate contracts | 0 |  | 0 | 79
Loss from early extinguishment of debt | 338 |  | 0 | 0
Interest expense | (653,138) |  | (645,117) | (579,572)
Net income | 396,285 |  | 90,996 | 298,432
Noncontrolling Interest in Net Income (Loss) Limited Partnerships, Nonredeemable | 75,181 |  | 67,516 | 78,661
Net income attributable to BXP, Inc. | 321,104 |  | 23,480 | 219,771
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 | 1,976,785 |  | 1,984,056 | 1,965,106
Other revenue | 16,383 |  | 16,488 | 17,771
Gains on sales of real estate | 179,322 |  | 602 | 517
Interest and Other Income | 35,784 |  | 60,199 | 69,964
Gains from investments in securities | 5,481 |  | 4,416 | 5,556
Unrealized gain (loss) on non-real estate investments | (346) |  | 546 | 239
General and administrative expense | 168,789 |  | 159,983 | 170,158
Operating expense | 16,383 |  | 16,488 | 17,771
Transaction costs | 2,678 |  | 1,597 | 4,313
Depreciation and amortization expense | 905,301 |  | 880,383 | 823,805
Income (Loss) from Equity Method Investments | 103,560 |  | 343,177 | 239,543
Loss on sales-type lease | 2,490 |  | 0 | 0
Impairment losses | 82,890 |  | 13,615 | 0
Loss from early extinguishment of debt | 338 |  | 0 | 0
Interest expense | 653,138 |  | 645,117 | 579,572
Net income | 396,285 |  | 90,996 | 298,432
Noncontrolling Interest in Net Income (Loss) Limited Partnerships, Nonredeemable | 75,181 |  | 67,516 | 78,661
Net income attributable to BXP, Inc. | 321,104 |  | 23,480 | 219,771
Unconsolidated Joint Ventures [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Gains on sales of real estate | 72,818 | [1] | 0 | 0
Company's share of net operating income from joint ventures | 122,569 |  | 129,718 | 160,695
Transaction costs | (233) |  | (456) | (301)
Depreciation and amortization expense | (173,310) |  | (160,756) | (197,228)
Income (Loss) from Equity Method Investments | 103,560 |  | 343,177 | 239,543
Loss on sales-type lease | 0 |  | 0 | (2,737)
Loss from early extinguishment of debt | 171 |  | 0 | 3
Interest expense | (172,915) |  | (176,994) | (227,537)
Net income | (748,474) |  | (29,583) | (56,272)
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 | 122,569 |  | 129,718 | 160,695
Losses from interest rate contracts | 0 |  | 0 | (79)
Management Service [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Other revenue | 36,579 |  | 28,060 | 40,850
Management Service [Member] | Segment Reconciling Items |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Other revenue | 36,579 |  | 28,060 | 40,850
Management Service [Member] | Boston Properties Limited Partnership |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Other revenue | 36,579 |  | 28,060 | 40,850
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 | 36,579 |  | 28,060 | 40,850
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 | (204,433) |  | (186,707) | (194,365)
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 | $ 204,433 |  | $ 186,707 | $ 194,365
[1] | During the year ended December 31, 2025, gains on sales of real estate included Beach Cities Media Campus and 751 Gateway.

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