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Consolidated Statements Of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Net income (loss) | $ 291,424 | $ 1,020,584 | $ 631,932
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 830,813 | 749,775 | 717,336
Amortization of right of use assets - operating leases | 1,940 | 2,427 | 3,516
Non-cash compensation expense | 51,478 | 52,026 | 50,860
Loss (income) from unconsolidated joint ventures | 239,543 | 59,840 | 2,570
Distributions of net cash flow from operations of unconsolidated joint ventures | 24,637 | 26,827 | 21,542
Losses (gains) from investments in securities | (5,556) | 6,453 | (5,626)
Allowance for current expected credit losses (gains) | 373 | (224) | (1,207)
Non-cash portion of interest expense | 30,523 | 25,831 | 23,368
Settlement of accreted debt discount on redemption of unsecured senior notes | 0 | 0 | (8,500)
Losses from early extinguishment of debt | 0 | 0 | 45,182
Other Income - assignment fee | 0 | (6,624) | 0
Gains on sales of real estate | (517) | (437,019) | (123,660)
Gain on sales-type lease | 0 | (10,058) | 0
Unrealized Gain (Loss) on non-real estate Investments | (239) | 150 | 0
Change in assets and liabilities: |  |  |
Tenant and other receivables, net | (31,470) | (7,621) | 4,820
Notes receivable, net | 0 | (152) | (545)
Accrued rental income, net | (99,539) | (98,075) | (101,548)
Prepaid expenses and other assets | (7,336) | 20,099 | (20,811)
Right of use assets - operating lease | (25,640) | 0 | 0
Lease liabilities - operating leases | (121) | 125 | (23,599)
Accounts payable and accrued expenses | 41,696 | (22,777) | 20,025
Accrued interest payable | 29,910 | 8,989 | (10,839)
Other liabilities | 7,267 | (24,120) | (28,739)
Tenant leasing costs | (77,666) | (84,057) | (62,850)
Total adjustments | 1,010,096 | 261,815 | 501,295
Net cash provided by operating activities | 1,301,520 | 1,282,399 | 1,133,227
Cash flows from investing activities: |  |  |
Acquisitions of real estate | 0 | (1,320,273) | (222,260)
Construction in progress | (525,963) | (500,273) | (513,878)
Building and other capital improvements | (171,424) | (177,004) | (150,998)
Tenant improvements | (310,925) | (218,685) | (263,952)
Proceeds from sales of real estate | 517 | 834,770 | 179,887
Acquisition of real estate (net of cash received upon consolidation) | (13,155) | 0 | 0
Proceeds from assignment fee | 0 | 6,624 | 0
Capital contributions to unconsolidated joint ventures | (192,650) | (277,581) | (98,152)
Capital distributions from unconsolidated joint ventures | 32,787 | 37,122 | 122
Proceeds from Sale of Equity Method Investments | 0 | 0 | 17,789
Investment in non-real estate investments | (2,187) | (2,404) | 0
Issuance of note receivables (including related party) | (12,177) | 0 | 0
Proceeds from note receivable | 0 | 10,000 | 10,035
Investments in securities, net | 1,496 | 4,902 | 1,451
Net cash used in investing activities | (1,193,681) | (1,602,802) | (1,039,956)
Cash flows from financing activities: |  |  |
Proceeds from Secured Notes Payable | 600,000 | 0 | 1,201,388
Repayments of mortgage notes payable | 0 | 0 | (832,296)
Proceeds from unsecured senior notes | 747,727 | 749,557 | 1,695,996
Redemption of unsecured senior notes | (500,000) | 0 | (1,841,500)
Borrowings on unsecured line of credit | 0 | 985,000 | 770,000
Repayments of unsecured line of credit | 0 | (1,130,000) | (625,000)
Borrowings on unsecured term loan | 1,200,000 | 730,000 | 0
Redemption of preferred stock | 0 | 0 | (200,000)
Payments on finance lease obligations | 0 | 0 | 1,250
Repayment of unsecured term loan | (730,000) | 0 | (500,000)
Deferred financing costs | (19,416) | (8,460) | (20,757)
Debt Issuance Costs | 0 | 0 | (16,186)
Debt prepayment and extinguishment costs | 0 | 0 | (43,036)
Net activity from equity transactions | 367 | (352) | 24,214
Dividends and distributions | (687,809) | (685,019) | (683,753)
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships | 244,541 | 849 | 18,002
Distributions to noncontrolling interests in property partnerships | (69,975) | (85,518) | (259,764)
Net cash provided by (used in) financing activities | 767,916 | 556,057 | (1,311,442)
Net increase (decrease) in cash and cash equivalents and cash held in escrows | 875,755 | 235,654 | (1,218,171)
Cash and cash equivalents and cash held in escrows, beginning of period | 736,812 | 501,158 | 1,719,329
Cash and cash equivalents and cash held in escrows, end of period | 1,612,567 | 736,812 | 501,158
Reconciliation of cash and cash equivalents and cash held in escrow |  |  |
Cash and cash equivalents, beginning of period | 690,333 | 452,692 | 1,668,742
Cash held in escrows, beginning of period | 46,479 | 48,466 | 50,587
Cash and cash equivalents, end of period | 1,531,477 | 690,333 | 452,692
Cash held in escrows,end of period | 81,090 | 46,479 | 48,466
Supplemental disclosures: |  |  |
Cash paid for interest | 553,989 | 449,903 | 465,442
Interest capitalized | 42,633 | 52,130 | 53,097
Non-cash investing and financing activities: |  |  |
Write-off of fully depreciated real estate | (135,093) | (119,534) | (239,317)
Change in real estate included in accounts payable and accrued expenses | 3,668 | 97,586 | (25,183)
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | 141,179 | 0 | 26,887
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability | 163,056 | 0 | 0
Non-cash contributions from noncontrolling interest in property partnerhips | 17,519 | 0 | 0
Capitalized operating lease costs | 12,580 | 0 | 0
Construction in progress from prepaid expenses and other assets | 25,577 | 0 | 0
Investment in unconsolidated joint ventures eliminated upon consolidation | 183,817 | 0 | 0
Mortgage notes payable recorded upon consolidation | 300,000 | 0 | 0
Real estate and intangibles recorded upon consolidation | (490,720) | 0 | 0
Interest rate swaps recorded upon consolidation | (7,337) | 0 | 0
Construction in progress, net deconsolidated | 0 | (11,316) | (299,947)
Investment in unconsolidated joint ventures recorded upon deconsolidation | 0 | 11,316 | 107,132
Sales-type lease origination | 0 | 13,045 | 0
Derecognition of assets in exchange for sales-type lease obligation | 0 | (2,987) | 0
Prepaid expenses and other assets, net deconsolidated | 0 | 0 | (5,011)
Assumption of mortgage notes payable | 0 | 0 | 200,311
Mortgage notes payable, net deconsolidation | 0 | 0 | (198,381)
Issuance of operating partnership units | 0 | 0 | 99,689
Dividends and distributions declared but not paid | 171,176 | 170,643 | 169,859
Conversions of noncontrolling interests to stockholders’ equity | 3,794 | 6,539 | 18,386
Issuance of restricted securities to employees and non-employee directors | 48,141 | 48,417 | 44,405
Cash |  |  |
Cash flows from financing activities: |  |  |
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships | 227,022 | 849 | 18,002
Boston Properties Limited Partnership |  |  |
Net income (loss) | 298,432 | 1,032,122 | 641,771
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 823,805 | 742,293 | 709,035
Amortization of right of use assets - operating leases | 1,940 | 2,427 | 3,516
Non-cash compensation expense | 51,478 | 52,026 | 50,860
Loss (income) from unconsolidated joint ventures | 239,543 | 59,840 | 2,570
Distributions of net cash flow from operations of unconsolidated joint ventures | 24,637 | 26,827 | 21,542
Losses (gains) from investments in securities | (5,556) | 6,453 | (5,626)
Allowance for current expected credit losses (gains) | 373 | (224) | (1,207)
Non-cash portion of interest expense | 30,523 | 25,831 | 23,368
Settlement of accreted debt discount on redemption of unsecured senior notes | 0 | 0 | (8,500)
Losses from early extinguishment of debt | 0 | 0 | 45,182
Other Income - assignment fee | 0 | (6,624) | 0
Gains on sales of real estate | (517) | (441,075) | (125,198)
Gain on sales-type lease | 0 | (10,058) | 0
Unrealized Gain (Loss) on non-real estate Investments | (239) | 150 | 0
Change in assets and liabilities: |  |  |
Tenant and other receivables, net | (31,470) | (7,621) | 4,820
Notes receivable, net | 0 | (152) | (545)
Accrued rental income, net | (99,539) | (98,075) | (101,548)
Prepaid expenses and other assets | (7,336) | 20,099 | (20,811)
Right of use assets - operating lease | (25,640) | 0 | 0
Lease liabilities - operating leases | (121) | 125 | (23,599)
Accounts payable and accrued expenses | 41,696 | (22,777) | 20,025
Accrued interest payable | 29,910 | 8,989 | (10,839)
Other liabilities | 7,267 | (24,120) | (28,739)
Tenant leasing costs | (77,666) | (84,057) | (62,850)
Total adjustments | 1,003,088 | 250,277 | 491,456
Net cash provided by operating activities | 1,301,520 | 1,282,399 | 1,133,227
Cash flows from investing activities: |  |  |
Acquisitions of real estate | 0 | (1,320,273) | (222,260)
Construction in progress | (525,963) | (500,273) | (513,878)
Building and other capital improvements | (171,424) | (177,004) | (150,998)
Tenant improvements | (310,925) | (218,685) | (263,952)
Proceeds from sales of real estate | 517 | 834,770 | 179,887
Acquisition of real estate (net of cash received upon consolidation) | (13,155) | 0 | 0
Proceeds from assignment fee | 0 | 6,624 | 0
Capital contributions to unconsolidated joint ventures | (192,650) | (277,581) | (98,152)
Capital distributions from unconsolidated joint ventures | 32,787 | 37,122 | 122
Proceeds from Sale of Equity Method Investments | 0 | 0 | 17,789
Investment in non-real estate investments | (2,187) | (2,404) | 0
Issuance of note receivables (including related party) | (12,177) | 0 | 0
Proceeds from note receivable | 0 | 10,000 | 10,035
Investments in securities, net | 1,496 | 4,902 | 1,451
Net cash used in investing activities | (1,193,681) | (1,602,802) | (1,039,956)
Cash flows from financing activities: |  |  |
Proceeds from Secured Notes Payable | 600,000 | 0 | 1,201,388
Repayments of mortgage notes payable | 0 | 0 | (832,296)
Proceeds from unsecured senior notes | 747,727 | 749,557 | 1,695,996
Redemption of unsecured senior notes | (500,000) | 0 | (1,841,500)
Borrowings on unsecured line of credit | 0 | 985,000 | 770,000
Repayments of unsecured line of credit | 0 | (1,130,000) | (625,000)
Borrowings on unsecured term loan | 1,200,000 | 730,000 | 0
Redemption of preferred stock | 0 | 0 | (200,000)
Payments on finance lease obligations | 0 | 0 | 1,250
Repayment of unsecured term loan | (730,000) | 0 | (500,000)
Deferred financing costs | (19,416) | (8,460) | (20,757)
Debt Issuance Costs | 0 | 0 | (16,186)
Debt prepayment and extinguishment costs | 0 | 0 | (43,036)
Net activity from equity transactions | 367 | (352) | 24,214
Dividends and distributions | (687,809) | (685,019) | (683,753)
Distributions to noncontrolling interests in property partnerships | (69,975) | (85,518) | (259,764)
Net cash provided by (used in) financing activities | 767,916 | 556,057 | (1,311,442)
Net increase (decrease) in cash and cash equivalents and cash held in escrows | 875,755 | 235,654 | (1,218,171)
Cash and cash equivalents and cash held in escrows, beginning of period | 736,812 | 501,158 | 1,719,329
Cash and cash equivalents and cash held in escrows, end of period | 1,612,567 | 736,812 | 501,158
Reconciliation of cash and cash equivalents and cash held in escrow |  |  |
Cash and cash equivalents, beginning of period | 690,333 | 452,692 | 1,668,742
Cash held in escrows, beginning of period | 46,479 | 48,466 | 50,587
Cash and cash equivalents, end of period | 1,531,477 | 690,333 | 452,692
Cash held in escrows,end of period | 81,090 | 46,479 | 48,466
Supplemental disclosures: |  |  |
Cash paid for interest | 553,989 | 449,903 | 465,442
Interest capitalized | 42,633 | 52,130 | 53,097
Non-cash investing and financing activities: |  |  |
Write-off of fully depreciated real estate | (133,844) | (119,534) | (238,003)
Change in real estate included in accounts payable and accrued expenses | 3,668 | 97,586 | (25,183)
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | 141,179 | 0 | 26,887
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability | 163,056 | 0 | 0
Non-cash contributions from noncontrolling interest in property partnerhips | 17,519 | 0 | 0
Capitalized operating lease costs | 12,580 | 0 | 0
Construction in progress from prepaid expenses and other assets | 25,577 | 0 | 0
Investment in unconsolidated joint ventures eliminated upon consolidation | 183,817 | 0 | 0
Mortgage notes payable recorded upon consolidation | 300,000 | 0 | 0
Real estate and intangibles recorded upon consolidation | (490,720) | 0 | 0
Interest rate swaps recorded upon consolidation | (7,337) | 0 | 0
Construction in progress, net deconsolidated | 0 | (11,316) | (299,947)
Investment in unconsolidated joint ventures recorded upon deconsolidation | 0 | 11,316 | 107,132
Sales-type lease origination | 0 | 13,045 | 0
Derecognition of assets in exchange for sales-type lease obligation | 0 | (2,987) | 0
Prepaid expenses and other assets, net deconsolidated | 0 | 0 | (5,011)
Assumption of mortgage notes payable | 0 | 0 | 200,311
Mortgage notes payable, net deconsolidation | 0 | 0 | (198,381)
Issuance of operating partnership units | 0 | 0 | 99,689
Dividends and distributions declared but not paid | 171,176 | 170,643 | 169,859
Conversions of noncontrolling interests to stockholders’ equity | 3,794 | 6,539 | 18,386
Issuance of restricted securities to employees and non-employee directors | 48,141 | 48,417 | 44,405
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 | $ 227,022 | $ 849 | $ 18,002

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