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Unsecured Senior Notes (Narrative) (Details) - USD ($) $ in Thousands			6 Months Ended
	Feb. 01, 2024	Oct. 26, 2023	Jun. 30, 2024	Jun. 30, 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
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

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