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Real Estate Properties Table (Details) - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Land		$ 5,108,880	$ 5,080,679
Land held for future development	[1]	210,902	204,925
Buildings and improvements		12,720,779	12,284,164
Tenant improvements		2,278,755	2,219,608
Furniture, fixtures and equipment		44,164	37,928
Construction in Progress		1,163,040	1,269,338
Total		21,526,520	21,096,642
Accumulated depreciation		(4,745,590)	(4,589,634)
Total real estate		16,780,930	16,507,008
Boston Properties Limited Partnership
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Land		5,005,471	4,976,303
Land held for future development	[1]	210,902	204,925
Buildings and improvements		12,416,577	11,977,062
Tenant improvements		2,278,755	2,219,608
Furniture, fixtures and equipment		44,164	37,928
Construction in Progress		1,163,040	1,269,338
Total		21,118,909	20,685,164
Accumulated depreciation		(4,649,907)	(4,496,959)
Total real estate		$ 16,469,002	$ 16,188,205
[1] Includes pre-development costs.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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