Unsecured Credit Facility (Details) - USD ($) $ in Thousands				12 Months Ended
	Dec. 31, 2021	Jun. 15, 2021	Mar. 16, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Line of Credit Facility [Line Items]
Repayments of Unsecured Debt				$ 1,841,500	$ 0	$ 699,237
Loss from early extinguishment of debt				$ 45,182	0	$ 29,540
Line of Credit Facility, Expiration Date		Jun. 15, 2026
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,500,000
Line of Credit, Additional Borrowing Capacity		$ 500,000
Line of Credit Facility, Interest Rate Description		At Boston Properties Limited Partnership’s option, loans under the 2021 Credit Facility will bear interest at a rate per annum equal to (1) (a) in the case of loans denominated in Dollars, LIBOR, (b) in the case of loans denominated in Euro, EURIBOR, (c) in the case of loans denominated in Canadian Dollars, CDOR, and (d) in the case of loans denominated in Sterling, SONIA, in each case, plus a margin ranging from 70.0 to 140.0 basis points based on Boston Properties Limited Partnership’s credit rating or (2) an alternate base rate equal to the greatest of (a) the Federal Funds rate plus 0.5%, (b) the Administrative Agent’s prime rate, (c) LIBOR for a one-month period plus 1.00%, and (d) 1.00%, in each case, plus a margin ranging from 0 to 40 basis points based on Boston Properties Limited Partnership’s credit rating.
Line of credit facility, maximum percent for loan advances		65.00%
Line of Credit Facility, Commitment Fee Percentage	0.15%
Debt Instrument, Basis Spread on Variable Rate	0.775%
Debt Instrument, Alternate Basis Spread on Variable Rate	0.00%			0.00%
Long-term Line of Credit	$ 145,000			$ 145,000	0
Unsecured term loan, net	0			$ 0	499,390
Line of Credit Facility, Covenant Terms		Among other covenants, the 2021 Credit Facility requires that Boston Properties Limited Partnership maintain on an ongoing basis: (1) a leverage ratio not to exceed 60%, however, the leverage ratio may increase to no greater than 65% provided that it is reduced back to 60% within one year, (2) a secured debt leverage ratio not to exceed 55%, (3) a fixed charge coverage ratio of at least 1.40, (4) an unsecured debt leverage ratio not to exceed 60%, however, the unsecured debt leverage ratio may increase to no greater than 65% provided that it is reduced to 60% within one year, (5) an unsecured debt interest coverage ratio of at least 1.75 and (6) limitations on permitted investments.
Line of Credit Facility, Covenant Compliance				At December 31, 2021, Boston Properties Limited Partnership was in compliance with each of these financial and other covenant requirements.
Maximum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.30%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		1.40%
Minimum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.10%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.70%
Delayed Draw Facility [Member]
Line of Credit Facility [Line Items]
Repayments of Unsecured Debt			$ 500,000
Loss from early extinguishment of debt			$ 500
Line of Credit Facility, Maximum Borrowing Capacity		$ 500,000
Unsecured term loan, net					$ 500,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Long-term Line of Credit	$ 145,000			$ 145,000