Unsecured Senior Notes (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended
	Feb. 01, 2024	Oct. 26, 2023	Mar. 31, 2024	Mar. 31, 2023
Debt Instrument [Line Items]
Proceeds from Secured Notes Payable		$ 600,000
Repayments of Unsecured Debt			$ 700,000	$ 0
Boston Properties Limited Partnership
Debt Instrument [Line Items]
Repayments of Unsecured Debt			700,000	$ 0
Senior Notes | Boston Properties Limited Partnership
Debt Instrument [Line Items]
Debt			$ 9,850,000
Debt Instrument, Covenant Description			The indenture relating to the unsecured senior notes contains certain financial restrictions and requirements, including (1) a leverage ratio not to exceed 60%, (2) a secured debt leverage ratio not to exceed 50%, (3) an interest coverage ratio of greater than 1.50, and (4) an unencumbered asset value of not less than 150% of unsecured debt.
Leverage ratio			60.00%
Secured debt leverage ratio - maximum			50.00%
Interest Coverage - Minimum			1.50
Unencumbered Asset Value - Minimum			150.00%
Debt Instrument, Covenant Compliance			At March 31, 2024, BPLP was in compliance with each of these financial restrictions and requirements.
3.916% unsecured senior notes | Senior Notes | Boston Properties Limited Partnership
Debt Instrument [Line Items]
Debt	$ 700,000
Debt Instrument, Interest Rate, Stated Percentage	3.80%
Repayments of Unsecured Debt	$ 713,300
Debt Instrument, Increase, Accrued Interest	$ 13,300