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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Net Income $ 383,995 $ 84,188 $ 291,424
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 912,088 887,191 830,813
Impairment loss 85,803 13,615 0
Amortization of right of use assets - operating leases 264 2,262 1,940
Amortization of sales type lease (989) (992) 0
Non-cash compensation expense 44,334 43,949 51,478
Loss from unconsolidated joint ventures 103,560 343,177 239,543
Distributions of net cash flow from operations of unconsolidated joint ventures 58,424 33,861 24,637
Gains from investments in securities (5,481) (4,416) (5,556)
Allowance for current expected credit losses (1,133) 78 373
Non-cash portion of interest expense 32,247 37,143 30,523
Loss from early extinguishment of debt 338 0 0
Gains on sales of real estate (176,732) (602) (517)
Loss on sales-type lease 2,490 0 0
Unrealized (gain) loss on non-real estate investments 346 (546) (239)
Change in assets and liabilities:      
Tenant and other receivables, net 32,507 13,716 (31,470)
Accrued rental income, net (101,878) (97,609) (99,539)
Prepaid expenses and other assets (4,148) (5,384) (7,336)
Right of use assets - operating lease 0 (750) (25,640)
Lease liabilities - operating leases (3,545) (202) (121)
Accounts payable and accrued expenses 27,161 (2,395) 41,696
Accrued interest payable (2,743) (5,647) 29,910
Other liabilities (19,133) 12,826 7,267
Tenant leasing costs (122,618) (118,962) (77,666)
Total adjustments 861,162 1,150,313 1,010,096
Net cash provided by operating activities 1,245,157 1,234,501 1,301,520
Cash flows from investing activities:      
Acquisitions of real estate (55,864) (35,366) 0
Construction in progress (683,750) (651,346) (525,963)
Building, pre-development and other capital improvements (216,687) (189,667) (171,424)
Tenant improvements (338,808) (258,312) (310,925)
Proceeds from sales of real estate 682,514 602 517
Acquisition of real estate upon consolidation of unconsolidated joint ventures (net of cash) 0 6,086 (13,155)
Capital contributions to unconsolidated joint ventures (258,752) (132,096) (192,650)
Capital distributions from unconsolidated joint ventures 172,662 28,325 32,787
Investment in non-real estate investments (3,538) (2,500) (2,187)
Issuance of note receivables (including related party) (22,861) (3,258) (12,177)
Proceeds from note receivables (including related party) 80,000 0 0
Investments in securities, net 558 136 1,496
Net cash used in investing activities (644,526) (1,237,396) (1,193,681)
Cash flows from financing activities:      
Proceeds from mortgage notes payable 0 0 600,000
Repayments of mortgage notes payable (4,251) (4,780) 0
Proceeds from unsecured senior notes 0 849,671 747,727
Redemption of unsecured senior notes (850,000) (700,000) (500,000)
Proceeds from Convertible Debt 1,000,000 0 0
Borrowings on unsecured line of credit 865,000 0 0
Repayments of unsecured line of credit (865,000) 0 0
Borrowings on unsecured term loans 700,000 0 1,200,000
Repayment of unsecured term loan (700,000) (500,000) (730,000)
Finance Lease, Principal Payments (13,662) (12,547) 0
Proceeds from Issuance of Commercial Paper 8,656,025 5,363,333 0
Repayments of Commercial Paper (8,406,025) (4,863,333) 0
Deferred financing costs (39,641) (12,235) (19,416)
Capped call transactions premium (35,000) 0 0
Net activity from equity transactions (435) (1,731) 367
Dividends and distributions (643,107) (689,870) (687,809)
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships 84,268 374,720 227,022
Distributions to noncontrolling interests in property partnerships (83,129) (77,704) (69,975)
Acquisition of noncontrolling interests in property partnerships (43,604) 0 0
Net cash provided by (used in) financing activities (378,561) (274,476) 767,916
Net increase (decrease) in cash and cash equivalents and cash held in escrows 222,070 (277,371) 875,755
Cash and cash equivalents and cash held in escrows, beginning of period 1,335,196 1,612,567 736,812
Cash and cash equivalents and cash held in escrows, end of period 1,557,266 1,335,196 1,612,567
Reconciliation of cash and cash equivalents and cash held in escrow      
Cash and cash equivalents, beginning of period 1,254,882 1,531,477 690,333
Cash held in escrows, beginning of period 80,314 81,090 46,479
Cash and cash equivalents, end of period 1,478,206 1,254,882 1,531,477
Cash held in escrows,end of period 79,060 80,314 81,090
Supplemental disclosures:      
Cash paid for interest (net of amounts capitalized) 677,156 676,067 553,989
Interest capitalized 50,626 41,976 42,633
Non-cash investing and financing activities:      
Write-off of fully depreciated real estate (155,440) (112,074) (135,093)
Change in real estate included in accounts payable and accrued expenses 11,910 (50,891) 3,668
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 0 30,631 141,179
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability 0 0 163,056
Finance Lease, Liability, Reversal from Re-Assessment 0 (38,491) 0
Finance Lease, Right-of-Use Asset, Reversal from Re-Assessment 0 (28,962) 0
Non-cash contributions from noncontrolling interests in property partnerships, net (2,557) 92,631 17,519
Capitalized operating lease costs 8,732 30,195 12,580
Construction in progress from prepaid expenses and other assets 0 0 25,577
Investment in unconsolidated joint ventures eliminated upon consolidation 0 (11,834) 183,817
Mortgage notes payable recorded upon consolidation 0 207,093 300,000
Mortgage note payable converted to unsecured term loan 0 100,000 0
Real estate and intangibles recorded upon consolidation 0 (220,015) (490,720)
Interest rate swaps recorded upon consolidation 0 0 (7,337)
Real estate contributed in exchange for investment in unconsolidated joint venture (5,595) 0 0
Investment in unconsolidated joint ventures funded by real estate contributed 5,595 0 0
Dividends and distributions declared but not paid 123,753 172,486 171,176
Conversions of noncontrolling interests to stockholders’ equity 9,113 40,564 3,794
Issuance of restricted securities to employees and non-employee directors 75,641 43,360 48,141
Boston Properties Limited Partnership      
Net Income 396,285 90,996 298,432
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 905,301 880,383 823,805
Impairment loss 82,890 13,615 0
Amortization of right of use assets - operating leases 264 2,262 1,940
Amortization of sales type lease (989) (992) 0
Non-cash compensation expense 44,334 43,949 51,478
Loss from unconsolidated joint ventures 103,560 343,177 239,543
Distributions of net cash flow from operations of unconsolidated joint ventures 58,424 33,861 24,637
Gains from investments in securities (5,481) (4,416) (5,556)
Allowance for current expected credit losses (1,133) 78 373
Non-cash portion of interest expense 32,247 37,143 30,523
Loss from early extinguishment of debt 338 0 0
Gains on sales of real estate (179,322) (602) (517)
Loss on sales-type lease 2,490 0 0
Unrealized (gain) loss on non-real estate investments 346 (546) (239)
Change in assets and liabilities:      
Tenant and other receivables, net 32,507 13,716 (31,470)
Accrued rental income, net (101,878) (97,609) (99,539)
Prepaid expenses and other assets (4,148) (5,384) (7,336)
Right of use assets - operating lease 0 (750) (25,640)
Lease liabilities - operating leases (3,545) (202) (121)
Accounts payable and accrued expenses 27,161 (2,395) 41,696
Accrued interest payable (2,743) (5,647) 29,910
Other liabilities (19,133) 12,826 7,267
Tenant leasing costs (122,618) (118,962) (77,666)
Total adjustments 848,872 1,143,505 1,003,088
Net cash provided by operating activities 1,245,157 1,234,501 1,301,520
Cash flows from investing activities:      
Acquisitions of real estate (55,864) (35,366) 0
Construction in progress (683,750) (651,346) (525,963)
Building, pre-development and other capital improvements (216,687) (189,667) (171,424)
Tenant improvements (338,808) (258,312) (310,925)
Proceeds from sales of real estate 682,514 602 517
Acquisition of real estate upon consolidation of unconsolidated joint ventures (net of cash) 0 6,086 (13,155)
Capital contributions to unconsolidated joint ventures (258,752) (132,096) (192,650)
Capital distributions from unconsolidated joint ventures 172,662 28,325 32,787
Investment in non-real estate investments (3,538) (2,500) (2,187)
Issuance of note receivables (including related party) (22,861) (3,258) (12,177)
Proceeds from note receivables (including related party) 80,000 0 0
Investments in securities, net 558 136 1,496
Net cash used in investing activities (644,526) (1,237,396) (1,193,681)
Cash flows from financing activities:      
Proceeds from mortgage notes payable 0 0 600,000
Repayments of mortgage notes payable (4,251) (4,780) 0
Proceeds from unsecured senior notes 0 849,671 747,727
Redemption of unsecured senior notes (850,000) (700,000) (500,000)
Proceeds from Convertible Debt 1,000,000 0 0
Borrowings on unsecured line of credit 865,000 0 0
Repayments of unsecured line of credit (865,000) 0 0
Borrowings on unsecured term loans 700,000 0 1,200,000
Repayment of unsecured term loan (700,000) (500,000) (730,000)
Finance Lease, Principal Payments (13,662) (12,547) 0
Proceeds from Issuance of Commercial Paper 8,656,025 5,363,333 0
Repayments of Commercial Paper (8,406,025) (4,863,333) 0
Deferred financing costs (39,641) (12,235) (19,416)
Capped call transactions premium (35,000) 0 0
Net activity from equity transactions (435) (1,731) 367
Dividends and distributions (643,107) (689,870) (687,809)
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships 84,268 374,720 227,022
Distributions to noncontrolling interests in property partnerships (83,129) (77,704) (69,975)
Acquisition of noncontrolling interests in property partnerships (43,604) 0 0
Net cash provided by (used in) financing activities (378,561) (274,476) 767,916
Net increase (decrease) in cash and cash equivalents and cash held in escrows 222,070 (277,371) 875,755
Cash and cash equivalents and cash held in escrows, beginning of period 1,335,196 1,612,567 736,812
Cash and cash equivalents and cash held in escrows, end of period 1,557,266 1,335,196 1,612,567
Reconciliation of cash and cash equivalents and cash held in escrow      
Cash and cash equivalents, beginning of period 1,254,882 1,531,477 690,333
Cash held in escrows, beginning of period 80,314 81,090 46,479
Cash and cash equivalents, end of period 1,478,206 1,254,882 1,531,477
Cash held in escrows,end of period 79,060 80,314 81,090
Supplemental disclosures:      
Cash paid for interest (net of amounts capitalized) 677,156 676,067 553,989
Interest capitalized 50,626 41,976 42,633
Non-cash investing and financing activities:      
Write-off of fully depreciated real estate (155,440) (112,074) (133,844)
Change in real estate included in accounts payable and accrued expenses 11,910 (50,891) 3,668
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 0 30,631 141,179
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability 0 0 163,056
Finance Lease, Liability, Reversal from Re-Assessment 0 (38,491) 0
Finance Lease, Right-of-Use Asset, Reversal from Re-Assessment 0 (28,962) 0
Non-cash contributions from noncontrolling interests in property partnerships, net (2,557) 92,631 17,519
Capitalized operating lease costs 8,732 30,195 12,580
Construction in progress from prepaid expenses and other assets 0 0 25,577
Investment in unconsolidated joint ventures eliminated upon consolidation 0 (11,834) 183,817
Mortgage notes payable recorded upon consolidation 0 207,093 300,000
Mortgage note payable converted to unsecured term loan 0 100,000 0
Real estate and intangibles recorded upon consolidation 0 (220,015) (490,720)
Interest rate swaps recorded upon consolidation 0 0 (7,337)
Real estate contributed in exchange for investment in unconsolidated joint venture (5,595) 0 0
Investment in unconsolidated joint ventures funded by real estate contributed 5,595 0 0
Dividends and distributions declared but not paid 123,753 172,486 171,176
Conversions of noncontrolling interests to stockholders’ equity 9,113 40,564 3,794
Issuance of restricted securities to employees and non-employee directors $ 75,641 $ 43,360 $ 48,141