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Subsequent Events (Details) $ in Thousands | Jul. 22, 2024 USD ($) | Jul. 18, 2024 ft² | Jul. 17, 2024 USD ($) | Jul. 12, 2024 ft² | Jun. 30, 2024 ft² Real_Estate_Properties | May 07, 2024 USD ($) ft²
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Office Tower Developer LLC |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Ownership Percentage |  |  |  |  | 50.00% |
PR II BXP Reston Gateway LLC |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Ownership Percentage |  |  |  |  | 20.00% |
Construction in Progress |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  | 3,100,000 |
Number of real estate properties | Real_Estate_Properties |  |  |  |  | 10 |
Residential Building |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Number of real estate properties | Real_Estate_Properties |  |  |  |  | 7 |
Residential Building | Construction in Progress |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Number of real estate properties | Real_Estate_Properties |  |  |  |  | 2 |
Shady Grove Innovation District [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  | 143,000
Contractual Sales Price | $ |  |  |  |  |  | $ 24,800
Number of real estate properties |  |  |  |  |  | 2
Subsequent Event [Member] | Skymark | Residential Building | Construction in Progress | Unconsolidated Properties | PR II BXP Reston Gateway LLC |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Ownership Percentage |  |  |  | 20.00% |  |
Number of Units in Real Estate Property |  |  |  | 508 |  |
Net Rentable Area (in sf) | ft² |  |  |  | 417,000 |  |
Subsequent Event [Member] | Low Rise Property |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Number of floors |  |  |  | 5 |  |
Subsequent Event [Member] | Tower Property |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Number of floors |  |  |  | 39 |  |
Subsequent Event [Member] | 100 Causeway Street [Member] | Unconsolidated Properties | Office Tower Developer LLC |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Ownership Percentage |  | 50.00% |  |  |  |
Net Rentable Area (in sf) | ft² |  | 634,000 |  |  |  |
Debt | $ |  |  | $ 333,600 |  |  |
Subsequent Event [Member] | 100 Causeway Street [Member] | Unconsolidated Properties | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Office Tower Developer LLC |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.48% |  |  |
Subsequent Event [Member] | 100 Causeway Street [Member] | Extended Maturity | Unconsolidated Properties | Office Tower Developer LLC |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Long-Term Debt, Term |  | 1 year |  |  |  |
Debt Instrument, Maturity Date |  | Sep. 05, 2025 |  |  |  |
Subsequent Event [Member] | 100 Causeway Street [Member] | Extended Maturity | Unconsolidated Properties | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Office Tower Developer LLC |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.48% |  |  |  |
Subsequent Event [Member] | Shady Grove Innovation District [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Contractual Sales Price | $ | $ 24,700 |  |  |  |  |
Proceeds from Deposits on Real Estate Sales | $ | $ 2,500 |  |  |  |  |

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