Unsecured Senior Notes (Narrative) (Details) - USD ($) $ in Thousands			9 Months Ended
	Sep. 01, 2023	May 15, 2023	Sep. 30, 2023		Sep. 30, 2022
Debt Instrument [Line Items]
Proceeds from unsecured senior notes			$ 747,727		$ 0
Repayments of Unsecured Debt			500,000		0
Boston Properties Limited Partnership
Debt Instrument [Line Items]
Proceeds from unsecured senior notes			747,727		0
Repayments of Unsecured Debt			500,000		$ 0
Senior Notes | Boston Properties Limited Partnership
Debt Instrument [Line Items]
Debt			$ 10,550,000
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 September 30, 2023, BPLP was in compliance with each of these financial restrictions and requirements.
6.619% unsecured senior notes | Senior Notes | Boston Properties Limited Partnership
Debt Instrument [Line Items]
Debt		$ 750,000	$ 750,000
Debt Instrument, Interest Rate, Stated Percentage		6.50%	6.50%
Senior Notes Pricing		99.697%
Debt Instrument, Interest Rate, Effective Percentage		6.619%	6.619%	[1]
Proceeds from unsecured senior notes		$ 741,300
3.279% unsecured senior notes | Senior Notes | Boston Properties Limited Partnership
Debt Instrument [Line Items]
Debt	$ 500,000
Debt Instrument, Interest Rate, Stated Percentage	3.125%
Repayments of Unsecured Debt	$ 507,800
Debt Instrument, Increase, Accrued Interest	$ 7,800

[1] Yield on issuance date including the effects of discounts on the notes, settlements of interest rate contracts and the amortization of financing costs.