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Commitments And Contingencies (Details) $ in Thousands | Jan. 24, 2025 | Dec. 09, 2024 USD ($) | Mar. 31, 2025 USD ($) ft² | Dec. 31, 2024 USD ($) | Oct. 02, 2023 USD ($) ft² | Jan. 05, 2023 ft² | Dec. 31, 2019 USD ($)
--- | --- | --- | --- | --- | --- | --- | ---
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Letter of credit and performance obligations |  |  | $ 20,300 |  |  |  |
Note receivable, net |  |  | 5,535 | $ 4,947 |  |  |
Accrued Liabilities |  | $ 2,200 |  |  |  |  | $ 1,500
Payments for Legal Settlements |  | $ 2,700 |  |  |  |  |
Loss Contingency, Portion Not Accrued |  |  | $ 31,000 |  |  |  |
Loss Contingency, Number of Defendants | 90 |  |  |  |  |  |
Construction in Progress |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  | 3,000,000.0 |  |  |  |
Boston Properties Limited Partnership |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Note receivable, net |  |  | $ 5,535 | $ 4,947 |  |  |
Metropolitan Square |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  | 657,000 |  |
Debt Instrument, Unused Borrowing Capacity, Amount |  |  |  |  | $ 100,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 12.00% |  |
Metropolitan Square | Affiliated Entity |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Note receivable, net |  |  | $ 5,500 |  |  |  |
Metropolitan Square | Scenario, Plan | Affiliated Entity |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Loans in Process |  |  |  |  | $ 20,000 |  |
Metropolitan Square | Metropolitan Square |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Ownership Percentage |  |  |  |  | 20.00% |  |
Office and Life Sciences Building [Member] | 290 Binney Street | Construction in Progress |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  | 573,000 |
Consolidated Entities, Ownership Percentage |  |  | 55.00% |  |  |  |
Leased percentage |  |  |  |  |  | 100.00% |
Office and Life Sciences Building [Member] | 250 Binney Street |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  | 67,000 |  |  |  |

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