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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.