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Real Estate Schedule of Real Estate Properties (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Real Estate Properties [Line Items] |  |  |
Land |  | $ 5,069,206 | $ 5,111,606
Right-of-use assets - finance leases |  | 237,393 | 237,394
Right of use assets - operating leases |  | 146,406 | 148,640
Land held for future development | [1] | 450,954 | 254,828
Buildings and improvements |  | 13,777,691 | 13,646,054
Tenant improvements |  | 2,752,880 | 2,656,439
Furniture, Fixtures and Equipment |  | 49,606 | 44,313
Construction in progress |  | 868,773 | 789,736
Total |  | 23,352,909 | 22,889,010
Less: accumulated depreciation |  | (5,534,102) | (5,266,798)
Total real estate |  | 17,818,807 | 17,622,212
Boston Properties Limited Partnership |  |  |
Real Estate Properties [Line Items] |  |  |
Land |  | 4,971,990 | 5,011,153
Right-of-use assets - finance leases |  | 237,393 | 237,394
Right of use assets - operating leases |  | 146,406 | 148,640
Land held for future development | [1] | 450,954 | 254,828
Buildings and improvements |  | 13,498,098 | 13,351,286
Tenant improvements |  | 2,752,880 | 2,656,439
Furniture, Fixtures and Equipment |  | 49,606 | 44,313
Construction in progress |  | 868,773 | 789,736
Total |  | 22,976,100 | 22,493,789
Less: accumulated depreciation |  | (5,428,576) | (5,162,908)
Total real estate |  | $ 17,547,524 | $ 17,330,881
[1] | Includes pre-development costs.

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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