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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Net Income $ 89,206 $ 322,005
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 680,073 661,148
Impairment loss 68,901 13,615
Amortization of right of use assets - operating leases 299 1,719
Amortization of sales type lease (749) (738)
Non-cash compensation expense 39,563 39,552
Income (loss) from unconsolidated joint ventures 153,792 (6,376)
Distributions of net cash flow from operations of unconsolidated joint ventures 45,450 27,332
Gains from investments in securities (4,635) (4,785)
Allowance for current expected credit losses (23) 44
Non-cash portion of interest expense 24,049 25,575
Loss from early extinguishment of debt 338 0
Gains on sales of real estate (20,322) (517)
Loss on sales-type lease 2,490 0
Unrealized (gain) loss on non-real estate investments 344 (548)
Change in assets and liabilities:    
Tenant and other receivables, net (4,851) 23,932
Accrued rental income, net (82,113) (78,576)
Prepaid expenses and other assets (71,234) (69,706)
Right of use assets - operating lease 0 (750)
Lease liabilities - operating leases (341) (390)
Accounts payable and accrued expenses 42,806 7,596
Accrued interest payable (7,962) (12,383)
Other liabilities (40,870) (35,333)
Tenant leasing costs (76,806) (61,661)
Total adjustments 748,199 528,750
Net cash provided by operating activities 837,405 850,755
Cash flows from investing activities:    
Construction in progress (500,537) (469,948)
Building, pre-development and other capital improvements (171,660) (118,411)
Tenant improvements (243,194) (178,835)
Proceeds from sale of real estate 21,840 517
Acquisition of real estate upon consolidation of unconsolidated joint ventures (net of cash) 0 6,086
Capital contributions to unconsolidated joint ventures (118,524) (87,498)
Capital distributions from unconsolidated joint ventures 29,211 0
Investment in non-real estate investments (2,060) (1,500)
Issuance of note receivables (including related party) (4,026) (2,223)
Investments in securities, net 722 1,025
Net cash used in investing activities (988,228) (850,787)
Cash flows from financing activities:    
Repayments of mortgage notes payable (3,195) (3,461)
Proceeds from unsecured senior notes 0 849,671
Redemption of unsecured senior notes (850,000) (700,000)
Proceeds from Convertible Debt 1,000,000 0
Borrowings on unsecured line of credit 865,000 0
Repayments of unsecured line of credit (865,000) 0
Borrowings on unsecured term loans 700,000 0
Repayment of unsecured term loan (700,000) (500,000)
Finance Lease, Principal Payments (10,174) (9,250)
Proceeds from Issuance of Commercial Paper 5,681,892 3,554,932
Repayments of Commercial Paper (5,431,892) (3,054,932)
Deferred financing costs (37,145) (10,892)
Capped call transactions premium (35,000) 0
Net activity from equity transactions (433) (1,728)
Dividends and distributions (519,720) (517,361)
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships 67,179 304,323
Distributions to noncontrolling interests in property partnerships (63,552) (52,353)
Acquisition of noncontrolling interests in property partnerships (43,604) 0
Net cash used in financing activities (245,644) (141,051)
Net increase (decrease) in cash and cash equivalents and cash held in escrows (396,467) (141,083)
Cash and cash equivalents and cash held in escrows, beginning of period 1,335,196 1,612,567
Cash and cash equivalents and cash held in escrows, end of period 938,729 1,471,484
Reconciliation of cash and cash equivalents and cash held in escrow    
Cash and cash equivalents, beginning of period 1,254,882 1,531,477
Cash held in escrows, beginning of period 80,314 81,090
Cash and cash equivalents, end of period 861,066 1,420,475
Cash held in escrows,end of period 77,663 51,009
Supplemental disclosures:    
Cash paid for interest (net of amounts capitalized) 513,887 505,746
Interest capitalized 35,956 31,342
Non-cash investing and financing activities:    
Write-off of fully depreciated real estate (108,867) (76,653)
Change in real estate included in accounts payable and accrued expenses 40,421 (21,035)
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 0 30,631
Finance Lease, Liability, Reversal from Re-Assessment 0 (38,491)
Finance Lease, Right-of-Use Asset, Reversal from Re-Assessment 0 (28,962)
Non-cash contributions from noncontrolling interests in property partnerships, net (2,548) 86,860
Capitalized operating lease costs 850 22,647
Investment in unconsolidated joint ventures eliminated upon consolidation 0 (11,834)
Mortgage notes payable recorded upon consolidation 0 207,093
Mortgage note payable converted to unsecured term loan 0 100,000
Real estate and intangibles recorded upon consolidation 0 (220,015)
Construction in progress, net deconsolidated (5,595) 0
Investment in unconsolidated joint ventures funded by real estate contributed 5,595 0
Dividends and distributions declared but not paid 123,259 172,191
Conversions of noncontrolling interests to stockholders’ equity 4,677 33,746
Issuance of restricted securities to employees and non-employee directors 43,658 43,360
Boston Properties Limited Partnership    
Net Income 97,327 327,109
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 674,964 656,044
Impairment loss 65,988 13,615
Amortization of right of use assets - operating leases 299 1,719
Amortization of sales type lease (749) (738)
Non-cash compensation expense 39,563 39,552
Income (loss) from unconsolidated joint ventures 153,792 (6,376)
Distributions of net cash flow from operations of unconsolidated joint ventures 45,450 27,332
Gains from investments in securities (4,635) (4,785)
Allowance for current expected credit losses (23) 44
Non-cash portion of interest expense 24,049 25,575
Loss from early extinguishment of debt 338 0
Gains on sales of real estate (20,421) (517)
Loss on sales-type lease 2,490 0
Unrealized (gain) loss on non-real estate investments 344 (548)
Change in assets and liabilities:    
Tenant and other receivables, net (4,851) 23,932
Accrued rental income, net (82,113) (78,576)
Prepaid expenses and other assets (71,234) (69,706)
Right of use assets - operating lease 0 (750)
Lease liabilities - operating leases (341) (390)
Accounts payable and accrued expenses 42,806 7,596
Accrued interest payable (7,962) (12,383)
Other liabilities (40,870) (35,333)
Tenant leasing costs (76,806) (61,661)
Total adjustments 740,078 523,646
Net cash provided by operating activities 837,405 850,755
Cash flows from investing activities:    
Construction in progress (500,537) (469,948)
Building, pre-development and other capital improvements (171,660) (118,411)
Tenant improvements (243,194) (178,835)
Proceeds from sale of real estate 21,840 517
Acquisition of real estate upon consolidation of unconsolidated joint ventures (net of cash) 0 6,086
Capital contributions to unconsolidated joint ventures (118,524) (87,498)
Capital distributions from unconsolidated joint ventures 29,211 0
Investment in non-real estate investments (2,060) (1,500)
Issuance of note receivables (including related party) (4,026) (2,223)
Investments in securities, net 722 1,025
Net cash used in investing activities (988,228) (850,787)
Cash flows from financing activities:    
Repayments of mortgage notes payable (3,195) (3,461)
Proceeds from unsecured senior notes 0 849,671
Redemption of unsecured senior notes (850,000) (700,000)
Proceeds from Convertible Debt 1,000,000 0
Borrowings on unsecured line of credit 865,000 0
Repayments of unsecured line of credit (865,000) 0
Borrowings on unsecured term loans 700,000 0
Repayment of unsecured term loan (700,000) (500,000)
Finance Lease, Principal Payments (10,174) (9,250)
Proceeds from Issuance of Commercial Paper 5,681,892 3,554,932
Repayments of Commercial Paper (5,431,892) (3,054,932)
Deferred financing costs (37,145) (10,892)
Capped call transactions premium (35,000) 0
Net activity from equity transactions (433) (1,728)
Dividends and distributions (519,720) (517,361)
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships 67,179 304,323
Distributions to noncontrolling interests in property partnerships (63,552) (52,353)
Acquisition of noncontrolling interests in property partnerships (43,604) 0
Net cash used in financing activities (245,644) (141,051)
Net increase (decrease) in cash and cash equivalents and cash held in escrows (396,467) (141,083)
Cash and cash equivalents and cash held in escrows, beginning of period 1,335,196 1,612,567
Cash and cash equivalents and cash held in escrows, end of period 938,729 1,471,484
Reconciliation of cash and cash equivalents and cash held in escrow    
Cash and cash equivalents, beginning of period 1,254,882 1,531,477
Cash held in escrows, beginning of period 80,314 81,090
Cash and cash equivalents, end of period 861,066 1,420,475
Cash held in escrows,end of period 77,663 51,009
Supplemental disclosures:    
Cash paid for interest (net of amounts capitalized) 513,887 505,746
Interest capitalized 35,956 31,342
Non-cash investing and financing activities:    
Write-off of fully depreciated real estate (108,867) (76,653)
Change in real estate included in accounts payable and accrued expenses 40,421 (21,035)
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 0 30,631
Finance Lease, Liability, Reversal from Re-Assessment 0 (38,491)
Finance Lease, Right-of-Use Asset, Reversal from Re-Assessment 0 (28,962)
Non-cash contributions from noncontrolling interests in property partnerships, net (2,548) 86,860
Capitalized operating lease costs 850 22,647
Investment in unconsolidated joint ventures eliminated upon consolidation 0 (11,834)
Mortgage notes payable recorded upon consolidation 0 207,093
Mortgage note payable converted to unsecured term loan 0 100,000
Real estate and intangibles recorded upon consolidation 0 (220,015)
Construction in progress, net deconsolidated (5,595) 0
Investment in unconsolidated joint ventures funded by real estate contributed 5,595 0
Dividends and distributions declared but not paid 123,259 172,191
Conversions of noncontrolling interests to stockholders’ equity 4,677 33,746
Issuance of restricted securities to employees and non-employee directors $ 43,658 $ 43,360