Real Estate Schedule of Real Estate Properties (Details) - USD ($) $ in Thousands		Jun. 30, 2021		Dec. 31, 2020
Real Estate Properties [Line Items]
Land		$ 5,038,870		$ 5,069,206
Right-of-use assets - finance leases		237,765		237,393
Right of use assets - operating leases		170,331	[1]	146,406
Land held for future development	[2]	497,019		450,954
Buildings and improvements		14,082,350		13,777,691
Tenant improvements		2,839,358		2,752,880
Furniture, Fixtures and Equipment		51,517		49,606
Construction in progress		908,061		868,773
Total		23,825,271		23,352,909
Less: accumulated depreciation		(5,752,818)		(5,534,102)
Total real estate		18,072,453		17,818,807
Boston Properties Limited Partnership
Real Estate Properties [Line Items]
Land		4,942,017		4,971,990
Right-of-use assets - finance leases		237,765		237,393
Right of use assets - operating leases		170,331	[1]	146,406
Land held for future development	[2]	497,019		450,954
Buildings and improvements		13,803,708		13,498,098
Tenant improvements		2,839,358		2,752,880
Furniture, Fixtures and Equipment		51,517		49,606
Construction in progress		908,061		868,773
Total		23,449,776		22,976,100
Less: accumulated depreciation		(5,643,781)		(5,428,576)
Total real estate		$ 17,805,995		$ 17,547,524

[1] See Note 4.

[2] Includes pre-development costs.