| Real estate, at cost (amounts related to variable interest entities (“vies”) of $8,083,218 and $8,005,124 at march 31, 2026 and december 31, 2025, respectively) | assets | 28.38B | |
| Right of use assets - finance leases (amounts related to vies of $21,000 and $21,000 at march 31, 2026 and december 31, 2025, respectively) | assets | 372.48M | |
| Right of use assets - operating leases | assets | 321.03M | |
| Aggregate | assets | 29.07B | |
| Total real estate | assets | 20.90B | |
| Real estate investment property, accumulated depreciation | assets | 8.17B | |
| Accrued rental income, net (amounts related to vies of $474,838 and $470,734 at march 31, 2026 and december 31, 2025, respectively) | assets | 1.56B | |
| Carying value of the company's investment in unconsolidated joint ventures | assets | 854.72M | |
| Deferred charges, net (amounts related to vies of $202,275 and $204,924 at march 31, 2026 and december 31, 2025, respectively) | assets | 830.92M | |
| Cash and cash equivalents (amounts related to vies of $193,689 and $255,631 at march 31, 2026 and december 31, 2025, respectively) | assets | 512.78M | |
| Prepaid expenses and other assets (amounts related to vies of $48,202 and $14,509 at march 31, 2026 and december 31, 2025, respectively) | assets | 188.82M | |
| Tenant and other receivables, net (amounts related to vies of $38,754 and $30,989 at march 31, 2026 and december 31, 2025, respectively) | assets | 90.14M | |
| Cash held in escrows (amounts related to vies of $5,381 and $10,319 at march 31, 2026 and december 31, 2025, respectively) | assets | 68.47M | |
| Investments in securities | assets | 42.07M | |
| Sales-type lease receivable, net | assets | 15.92M | |
| Related party note receivable, net | assets | 10.07M | |
| Total assets | assets | 25.10B | |
| Total liabilities | liabilities | 17.38B | |
| Retained earnings (accumulated deficit) | liabilities | 1.68B | |
| Accumulated other comprehensive income (loss), net of tax | liabilities | 6.08M | |
| Treasury stock, value | assets | 2.72M | |
| Total equity / capital | liabilities | 7.72B | |
| Redeemable partnership units— 15,675,504 and 15,590,009 common units and 3,111,708 and 2,662,140 long term incentive units outstanding at redemption value at march 31, 2026 and december 31, 2025, respectively | liabilities | 1.03B | |
| Redeemable deferred stock units— 116,733 and 111,701 units outstanding at redemption value at march 31, 2026 and december 31, 2025, respectively | liabilities | 6.06M | |
| Senior notes | liabilities | 8.81B | |
| Mortgage notes payable, net (amounts related to vies of $3,288,081 and $3,286,870 at march 31, 2026 and december 31, 2025, respectively) | liabilities | 4.28B | |
| Unsecured exchangeable senior notes, net | liabilities | 977.39M | |
| Unsecured term loans, net | liabilities | 797.31M | |
| Unsecured commercial paper | liabilities | 750.00M | |
| Accounts payable and accrued expenses (amounts related to vies of $80,255 and $88,849 at march 31, 2026 and december 31, 2025, respectively) | liabilities | 418.44M | |
| Operating lease, liability | liabilities | 387.48M | |
| Finance lease, liability | liabilities | 357.04M | |
| Other liabilities (amounts related to vies of $85,594 and $95,209 at march 31, 2026 and december 31, 2025, respectively) | liabilities | 352.81M | |
| Interest payable | liabilities | 124.07M | |
| Dividends and distributions payable | liabilities | 124.02M | |
| Aggregate | liabilities | 15.88B | |
| Additional paid in capital | liabilities | 6.84B | |
| Boston properties limited partnership partners’ capital— 1,774,632 and 1,768,004 general partner units and 156,901,331 and 156,780,294 limited partner units outstanding at march 31, 2026 and december 31, 2025, respectively | liabilities | 4.49B | |
| Noncontrolling interest in limited partnerships | liabilities | 1.98B | |
| Noncontrolling interests in property partnerships | liabilities | 1.98B | |
| Common units of the operating partnership | liabilities | 583.92M | |
| Common stock, $0.01 par value, 250,000,000 shares authorized, 158,754,863 and 158,627,198 issued and 158,675,963 and 158,548,298 outstanding at march 31, 2026 and december 31, 2025, respectively | liabilities | 1.59M | |
| Total partners’ capital | liabilities | 4.48B | |
| Aggregate | equity | 6.85B | |