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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2023
Subsequent Events [Abstract]
Subsequent Events	13. Subsequent Events On April 21, 2023, a joint venture in which BXP has a 50% interest exercised an option to extend by one year the maturity date of its $252.6 million construction loan collateralized by its 7750 Wisconsin Avenue property. The completed 734,000 square foot build-to-suit, premier workplace is located in Bethesda, Maryland and is 100% leased to an affiliate of Marriott International, Inc. Effective June 1, 2023, the financing will bear interest at a variable rate equal to Term SOFR plus 1.35% per annum and will now mature on April 26, 2024, with a one-year extension option, subject to certain conditions. On April 29, 2023, the Company completed and fully placed in-service 2100 Pennsylvania Avenue, a premier workplace project with approximately 480,000 net rentable square feet located in Washington, DC. On May 02, 2023, BPLP executed interest rate swaps in notional amounts aggregating $1.2 billion. These interest rate swaps were entered into to fix Term SOFR under for BPLP’s 2023 Unsecured Term Loan at a weighted-average rate of 4.6420% for the period commencing on May 4, 2023 and ending on May 16, 2024. Based on BPLP’s credit rating as of May 2, 2023, the interest rate for the 2023 Unsecured Term Loan would be 5.592% (See Note 6).