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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Net income (loss) $ 322,005 $ 138,269
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 661,148 618,746
Impairment loss 13,615 0
Amortization of right of use assets - operating leases 1,719 1,502
Amortization of sales type lease (738) 0
Amortization of above and below Market Leases (4,245) 0
Non-cash compensation expense 39,552 46,699
Loss (income) from unconsolidated joint ventures (6,376) 261,793
Distributions of net cash flow from operations of unconsolidated joint ventures 27,332 21,871
Gains from investments in securities (4,785) (2,311)
Allowance for current expected credit losses 44 302
Non-cash portion of interest expense 25,575 22,541
Gains on sales of real estate (517) (517)
Unrealized (Gain) Loss on non-real estate Investments (548) (332)
Change in assets and liabilities:    
Tenant and other receivables, net 23,932 (13,467)
Accrued rental income, net (78,576) (72,190)
Prepaid expenses and other assets (73,215) (76,621)
Right of use assets - operating lease (750) (25,640)
Lease liabilities - operating leases (390) 282
Accounts payable and accrued expenses 7,596 40,914
Accrued interest payable (12,383) 24,648
Other liabilities (27,579) (6,254)
Tenant leasing costs (61,661) (65,863)
Total adjustments 528,750 776,103
Net cash provided by operating activities 850,755 914,372
Cash flows from investing activities:    
Construction in progress (469,948) (361,625)
Building and other capital improvements (118,411) (117,393)
Tenant improvements (178,835) (244,841)
Proceeds from sales of real estate 517 517
Acquisition of real estate (net of cash received upon consolidation) 6,086 0
Capital contributions to unconsolidated joint ventures (87,498) (148,875)
Capital distributions from unconsolidated joint ventures 0 7,350
Investment in non-real estate investments (1,500) (1,990)
Issuance of note receivables (including related party) (2,223) (10,500)
Investments in securities, net 1,025 1,779
Net cash used in investing activities (850,787) (875,578)
Cash flows from financing activities:    
Repayments of mortgage notes payable (3,461) 0
Proceeds from unsecured senior notes 849,671 747,727
Redemption of unsecured senior notes (700,000) (500,000)
Borrowings on unsecured term loans 0 1,200,000
Payments on finance lease obligations (9,250) 0
Repayment of unsecured term loan (500,000) (730,000)
Proceeds from Issuance of Commercial Paper 3,554,932 0
Repayments of Commercial Paper (3,054,932) 0
Deferred financing costs (10,892) (12,639)
Net activity from equity transactions (1,728) 367
Dividends and distributions (517,361) (514,974)
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships 306,147 30,190
Distributions to noncontrolling interests in property partnerships (52,353) (48,370)
Net cash provided by (used in) financing activities (141,051) 154,782
Net increase (decrease) in cash and cash equivalents and cash held in escrows (141,083) 193,576
Cash and cash equivalents and cash held in escrows, beginning of period 1,612,567 736,812
Cash and cash equivalents and cash held in escrows, end of period 1,471,484 930,388
Reconciliation of cash and cash equivalents and cash held in escrow    
Cash and cash equivalents, beginning of period 1,531,477 690,333
Cash held in escrows, beginning of period 81,090 46,479
Cash and cash equivalents, end of period 1,420,475 882,647
Cash held in escrows,end of period 51,009 47,741
Supplemental disclosures:    
Cash paid for interest 505,746 404,016
Interest capitalized 31,342 33,426
Non-cash investing and financing activities:    
Write-off of fully depreciated real estate (76,653) (111,154)
Change in real estate included in accounts payable and accrued expenses (21,035) 29,435
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 30,631 134,509
Finance Lease, Liability, Reversal from Re-Assessment (38,491) 0
Finance Lease, Right-of-Use Asset, Reversal from Re-Assessment (28,962) 0
Non-cash contributions from noncontrolling interest in property partnerhips 86,860 17,519
Capitalized operating lease costs 22,647 5,031
Construction in progress from prepaid expenses and other assets 0 25,577
Investment in unconsolidated joint ventures eliminated upon consolidation (11,834) 0
Mortgage notes payable recorded upon consolidation 207,093 0
Real estate and intangibles recorded upon consolidation (220,015) 0
Dividends and distributions declared but not paid 172,191 171,916
Conversions of noncontrolling interests to stockholders’ equity 33,746 3,714
Issuance of restricted securities to employees and non-employee directors 43,360 48,121
Mortgage note payable converted to unsecured term loan 100,000 0
Cash    
Cash flows from financing activities:    
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships 304,323 12,671
Boston Properties Limited Partnership    
Net income (loss) 327,109 143,569
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 656,044 613,446
Impairment loss 13,615 0
Amortization of right of use assets - operating leases 1,719 1,502
Amortization of sales type lease (738) 0
Amortization of above and below Market Leases (4,245) 0
Non-cash compensation expense 39,552 46,699
Loss (income) from unconsolidated joint ventures (6,376) 261,793
Distributions of net cash flow from operations of unconsolidated joint ventures 27,332 21,871
Gains from investments in securities (4,785) (2,311)
Allowance for current expected credit losses 44 302
Non-cash portion of interest expense 25,575 22,541
Gains on sales of real estate (517) (517)
Unrealized (Gain) Loss on non-real estate Investments (548) (332)
Change in assets and liabilities:    
Tenant and other receivables, net 23,932 (13,467)
Accrued rental income, net (78,576) (72,190)
Prepaid expenses and other assets (73,215) (76,621)
Right of use assets - operating lease (750) (25,640)
Lease liabilities - operating leases (390) 282
Accounts payable and accrued expenses 7,596 40,914
Accrued interest payable (12,383) 24,648
Other liabilities (27,579) (6,254)
Tenant leasing costs (61,661) (65,863)
Total adjustments 523,646 770,803
Net cash provided by operating activities 850,755 914,372
Cash flows from investing activities:    
Construction in progress (469,948) (361,625)
Building and other capital improvements (118,411) (117,393)
Tenant improvements (178,835) (244,841)
Proceeds from sales of real estate 517 517
Acquisition of real estate (net of cash received upon consolidation) 6,086 0
Capital contributions to unconsolidated joint ventures (87,498) (148,875)
Capital distributions from unconsolidated joint ventures 0 7,350
Investment in non-real estate investments (1,500) (1,990)
Issuance of note receivables (including related party) (2,223) (10,500)
Investments in securities, net 1,025 1,779
Net cash used in investing activities (850,787) (875,578)
Cash flows from financing activities:    
Repayments of mortgage notes payable (3,461) 0
Proceeds from unsecured senior notes 849,671 747,727
Redemption of unsecured senior notes (700,000) (500,000)
Borrowings on unsecured term loans 0 1,200,000
Payments on finance lease obligations 9,250 0
Repayment of unsecured term loan (500,000) (730,000)
Proceeds from Issuance of Commercial Paper 3,554,932 0
Repayments of Commercial Paper (3,054,932) 0
Deferred financing costs (10,892) (12,639)
Net activity from equity transactions (1,728) 367
Dividends and distributions (517,361) (514,974)
Distributions to noncontrolling interests in property partnerships (52,353) (48,370)
Net cash provided by (used in) financing activities (141,051) 154,782
Net increase (decrease) in cash and cash equivalents and cash held in escrows (141,083) 193,576
Cash and cash equivalents and cash held in escrows, beginning of period 1,612,567 736,812
Cash and cash equivalents and cash held in escrows, end of period 1,471,484 930,388
Reconciliation of cash and cash equivalents and cash held in escrow    
Cash and cash equivalents, beginning of period 1,531,477 690,333
Cash held in escrows, beginning of period 81,090 46,479
Cash and cash equivalents, end of period 1,420,475 882,647
Cash held in escrows,end of period 51,009 47,741
Supplemental disclosures:    
Cash paid for interest 505,746 404,016
Interest capitalized 31,342 33,426
Non-cash investing and financing activities:    
Write-off of fully depreciated real estate (76,653) (109,905)
Change in real estate included in accounts payable and accrued expenses (21,035) 29,435
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 30,631  
Finance Lease, Liability, Reversal from Re-Assessment (38,491) 0
Finance Lease, Right-of-Use Asset, Reversal from Re-Assessment (28,962) 0
Non-cash contributions from noncontrolling interest in property partnerhips 86,860 17,519
Capitalized operating lease costs 22,647 5,031
Construction in progress from prepaid expenses and other assets 0 25,577
Investment in unconsolidated joint ventures eliminated upon consolidation (11,834) 0
Mortgage notes payable recorded upon consolidation 207,093 0
Real estate and intangibles recorded upon consolidation (220,015) 0
Dividends and distributions declared but not paid 172,191 171,916
Conversions of noncontrolling interests to stockholders’ equity 33,746 3,714
Issuance of restricted securities to employees and non-employee directors 43,360 48,121
Mortgage note payable converted to unsecured term loan 100,000 0
Boston Properties Limited Partnership | Cash    
Cash flows from financing activities:    
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships $ 304,323 $ 12,671