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SEC Schedule, Article 12-28, Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 2,909,081      
Original Cost        
Original Land 5,160,116      
Original Building 13,196,160      
Costs Capitalized Subsequent to Acquisition 4,947,027      
Land and Improvements 5,429,703      
Building and Improvements 16,553,873      
Land held for development [1] 450,954 $ 254,828    
Development and Construction in Progress 868,773 789,736    
Total 23,303,303 22,844,697 $ 21,605,545 $ 21,058,714
Accumulated Depreciation 5,501,637 5,239,179 4,871,102 4,566,570
Furniture, Fixtures and Equipment 49,606 44,313    
Aggregate cost for tax purpose 20,700,000      
Real Estate Aggregate Accumulated Depreciation For Tax Purposes 4,500,000      
Debt Issuance Costs, Net (22,905)      
Right-of-use assets - finance leases 237,393 237,394    
Right of use assets - operating leases $ 146,406 148,640    
Maximum [Member]        
Original Cost        
Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Furniture, fixtures, and equipment        
Original Cost        
Accumulated Depreciation Related to Furniture, Fixtures and Equipment $ 32,465      
Land and Land Improvements [Member]        
Original Cost        
Right-of-use assets - finance leases 214,091      
Right of use assets - operating leases 146,406      
Buildings and improvements        
Original Cost        
Right-of-use assets - finance leases 23,302      
Boston Properties Limited Partnership        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances [2] 2,909,081      
Original Cost        
Original Land 5,160,116      
Original Building 13,196,160      
Costs Capitalized Subsequent to Acquisition 4,570,218      
Land and Improvements [3] 5,332,487      
Building and Improvements [4] 16,274,280      
Land held for development [1] 450,954 254,828    
Development and Construction in Progress 868,773 789,736    
Total 22,926,494 22,449,476 21,207,189 20,647,236
Accumulated Depreciation 5,396,111 5,135,289 $ 4,773,800 $ 4,473,895
Furniture, Fixtures and Equipment 49,606 44,313    
Aggregate cost for tax purpose 23,000,000      
Real Estate Aggregate Accumulated Depreciation For Tax Purposes 5,000,000      
Debt Issuance Costs, Net (22,900)      
Right-of-use assets - finance leases 237,393 237,394    
Right of use assets - operating leases $ 146,406 $ 148,640    
Boston Properties Limited Partnership | Maximum [Member]        
Original Cost        
Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Boston Properties Limited Partnership | Furniture, fixtures, and equipment        
Original Cost        
Accumulated Depreciation Related to Furniture, Fixtures and Equipment $ 32,465      
Boston Properties Limited Partnership | Land and Land Improvements [Member]        
Original Cost        
Right-of-use assets - finance leases 214,091      
Right of use assets - operating leases 148,640      
Boston Properties Limited Partnership | Buildings and improvements        
Original Cost        
Right-of-use assets - finance leases 23,302      
767Fifth Avenue (the General Motors Building) | Office Building [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 2,277,522      
Original Cost        
Original Land 1,796,252      
Original Building 1,532,654      
Costs Capitalized Subsequent to Acquisition 227,450      
Land and Improvements 1,796,252      
Building and Improvements 1,760,104      
Total 3,556,356      
Accumulated Depreciation $ 364,145      
Depreciable Lives (Years) [5] (1)      
767Fifth Avenue (the General Motors Building) | Boston Properties Limited Partnership | Office Building [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 2,277,522      
Original Cost        
Original Land 1,796,252      
Original Building 1,532,654      
Costs Capitalized Subsequent to Acquisition 227,450      
Land and Improvements 1,796,252      
Building and Improvements 1,760,104      
Total 3,556,356      
Accumulated Depreciation $ 364,145      
Depreciable Lives (Years) [6] (1)      
Prudential Center | Office Building [Member]        
Original Cost        
Original Land $ 92,077      
Original Building 948,357      
Costs Capitalized Subsequent to Acquisition 573,187      
Land and Improvements 115,638      
Building and Improvements 1,480,302      
Land held for development 17,681      
Total 1,613,621      
Accumulated Depreciation $ 634,402      
Depreciable Lives (Years) (1)      
Prudential Center | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 92,077      
Original Building 948,357      
Costs Capitalized Subsequent to Acquisition 512,816      
Land and Improvements 100,540      
Building and Improvements 1,435,029      
Land held for development 17,681      
Total 1,553,250      
Accumulated Depreciation $ 617,331      
Depreciable Lives (Years) [6] (1)      
Embarcadero Center | Office Building [Member]        
Original Cost        
Original Land $ 179,697      
Original Building 847,410      
Costs Capitalized Subsequent to Acquisition 469,860      
Land and Improvements 195,987      
Building and Improvements 1,300,980      
Total 1,496,967      
Accumulated Depreciation $ 680,507      
Depreciable Lives (Years) [5] (1)      
Embarcadero Center | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 179,697      
Original Building 847,410      
Costs Capitalized Subsequent to Acquisition 407,480      
Land and Improvements 180,420      
Building and Improvements 1,254,167      
Total 1,434,587      
Accumulated Depreciation $ 662,756      
Depreciable Lives (Years) [6] (1)      
399 Park Avenue | Office Building [Member]        
Original Cost        
Original Land $ 339,200      
Original Building 700,358      
Costs Capitalized Subsequent to Acquisition 340,960      
Land and Improvements 354,107      
Building and Improvements 1,026,411      
Total 1,380,518      
Accumulated Depreciation $ 387,217      
Depreciable Lives (Years) [5] (1)      
399 Park Avenue | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 339,200      
Original Building 700,358      
Costs Capitalized Subsequent to Acquisition 281,352      
Land and Improvements 339,200      
Building and Improvements 981,710      
Total 1,320,910      
Accumulated Depreciation $ 370,361      
Depreciable Lives (Years) [6] (1)      
Salesforce Tower | Office Building [Member]        
Original Cost        
Original Land $ 200,349      
Original Building 946,205      
Costs Capitalized Subsequent to Acquisition 5,355      
Land and Improvements 200,349      
Building and Improvements 951,560      
Total 1,151,909      
Accumulated Depreciation $ 68,918      
Depreciable Lives (Years) [5] (1)      
Salesforce Tower | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 200,349      
Original Building 946,205      
Costs Capitalized Subsequent to Acquisition 5,355      
Land and Improvements 200,349      
Building and Improvements 951,560      
Total 1,151,909      
Accumulated Depreciation $ 68,918      
Depreciable Lives (Years) [6] (1)      
601 Lexington Avenue | Office Building [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 630,068      
Original Cost        
Original Land 241,600      
Original Building 494,782      
Costs Capitalized Subsequent to Acquisition 446,950      
Land and Improvements 289,639      
Building and Improvements 663,694      
Development and Construction in Progress 229,999      
Total 1,183,332      
Accumulated Depreciation $ 284,477      
Depreciable Lives (Years) [5] (1)      
601 Lexington Avenue | Boston Properties Limited Partnership | Office Building [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 630,068      
Original Cost        
Original Land 241,600      
Original Building 494,782      
Costs Capitalized Subsequent to Acquisition 409,864      
Land and Improvements 279,281      
Building and Improvements 636,966      
Development and Construction in Progress 229,999      
Total 1,146,246      
Accumulated Depreciation $ 274,343      
Depreciable Lives (Years) [6] (1)      
200 Clarendon Street and Garage | Office Building [Member]        
Original Cost        
Original Land $ 219,543      
Original Building 667,884      
Costs Capitalized Subsequent to Acquisition 218,821      
Land and Improvements 251,374      
Building and Improvements 854,874      
Total 1,106,248      
Accumulated Depreciation $ 244,882      
Depreciable Lives (Years) [5] (1)      
200 Clarendon Street and Garage | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 219,543      
Original Building 667,884      
Costs Capitalized Subsequent to Acquisition 218,821      
Land and Improvements 251,374      
Building and Improvements 854,874      
Total 1,106,248      
Accumulated Depreciation $ 244,882      
Depreciable Lives (Years) [6] (1)      
250 West 55th Street | Office Building [Member]        
Original Cost        
Original Land $ 285,263      
Original Building 603,167      
Costs Capitalized Subsequent to Acquisition 51,860      
Land and Improvements 285,263      
Building and Improvements 655,027      
Total 940,290      
Accumulated Depreciation $ 138,004      
Depreciable Lives (Years) [5] (1)      
250 West 55th Street | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 285,263      
Original Building 603,167      
Costs Capitalized Subsequent to Acquisition 51,860      
Land and Improvements 285,263      
Building and Improvements 655,027      
Total 940,290      
Accumulated Depreciation $ 138,004      
Depreciable Lives (Years) [6] (1)      
100 Federal Street | Office Building [Member]        
Original Cost        
Original Land $ 131,067      
Original Building 435,954      
Costs Capitalized Subsequent to Acquisition 111,196      
Land and Improvements 131,067      
Building and Improvements 547,150      
Total 678,217      
Accumulated Depreciation $ 141,629      
Depreciable Lives (Years) [5] (1)      
100 Federal Street | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 131,067      
Original Building 435,954      
Costs Capitalized Subsequent to Acquisition 111,196      
Land and Improvements 131,067      
Building and Improvements 547,150      
Total 678,217      
Accumulated Depreciation $ 141,629      
Depreciable Lives (Years) [6] (1)      
Times Square Tower | Office Building [Member]        
Original Cost        
Original Land $ 165,413      
Original Building 380,438      
Costs Capitalized Subsequent to Acquisition 108,206      
Land and Improvements 169,193      
Building and Improvements 484,864      
Total 654,057      
Accumulated Depreciation $ 217,845      
Depreciable Lives (Years) [5] (1)      
Times Square Tower | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 165,413      
Original Building 380,438      
Costs Capitalized Subsequent to Acquisition 70,227      
Land and Improvements 159,694      
Building and Improvements 456,384      
Total 616,078      
Accumulated Depreciation $ 207,106      
Depreciable Lives (Years) [6] (1)      
Carnegie Center | Office Building [Member]        
Original Cost        
Original Land $ 142,666      
Original Building 316,856      
Costs Capitalized Subsequent to Acquisition 153,797      
Land and Improvements 94,240      
Building and Improvements 463,959      
Land held for development 55,120      
Total 613,319      
Accumulated Depreciation $ 221,323      
Depreciable Lives (Years) [5] (1)      
Carnegie Center | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 142,666      
Original Building 316,856      
Costs Capitalized Subsequent to Acquisition 138,834      
Land and Improvements 90,498      
Building and Improvements 452,738      
Land held for development 55,120      
Total 598,356      
Accumulated Depreciation $ 217,092      
Depreciable Lives (Years) [6] (1)      
Atlantic Wharf | Office Building [Member]        
Original Cost        
Original Land $ 63,988      
Original Building 454,537      
Costs Capitalized Subsequent to Acquisition 18,538      
Land and Improvements 63,988      
Building and Improvements 473,075      
Total 537,063      
Accumulated Depreciation $ 146,860      
Depreciable Lives (Years) [5] (1)      
Atlantic Wharf | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 63,988      
Original Building 454,537      
Costs Capitalized Subsequent to Acquisition 18,538      
Land and Improvements 63,988      
Building and Improvements 473,075      
Total 537,063      
Accumulated Depreciation $ 146,860      
Depreciable Lives (Years) [6] (1)      
510 Madison Avenue | Office Building [Member]        
Original Cost        
Original Land $ 103,000      
Original Building 253,665      
Costs Capitalized Subsequent to Acquisition 28,446      
Land and Improvements 103,000      
Building and Improvements 282,111      
Total 385,111      
Accumulated Depreciation $ 81,517      
Depreciable Lives (Years) [5] (1)      
510 Madison Avenue | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 103,000      
Original Building 253,665      
Costs Capitalized Subsequent to Acquisition 28,446      
Land and Improvements 103,000      
Building and Improvements 282,111      
Total 385,111      
Accumulated Depreciation $ 81,517      
Depreciable Lives (Years) [6] (1)      
Fountain Square | Office Building [Member]        
Original Cost        
Original Land $ 56,853      
Original Building 306,298      
Costs Capitalized Subsequent to Acquisition 21,030      
Land and Improvements 56,853      
Building and Improvements 327,328      
Total 384,181      
Accumulated Depreciation $ 90,047      
Depreciable Lives (Years) [5] (1)      
Fountain Square | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 56,853      
Original Building 306,298      
Costs Capitalized Subsequent to Acquisition 21,030      
Land and Improvements 56,853      
Building and Improvements 327,328      
Total 384,181      
Accumulated Depreciation $ 90,047      
Depreciable Lives (Years) [6] (1)      
599 Lexington Avenue | Office Building [Member]        
Original Cost        
Original Land $ 81,040      
Original Building 100,507      
Costs Capitalized Subsequent to Acquisition 214,275      
Land and Improvements 87,852      
Building and Improvements 307,970      
Total 395,822      
Accumulated Depreciation $ 193,058      
Depreciable Lives (Years) [5] (1)      
599 Lexington Avenue | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 81,040      
Original Building 100,507      
Costs Capitalized Subsequent to Acquisition 187,033      
Land and Improvements 81,040      
Building and Improvements 287,540      
Total 368,580      
Accumulated Depreciation $ 185,354      
Depreciable Lives (Years) [6] (1)      
680 Folsom Street | Office Building [Member]        
Original Cost        
Original Land $ 72,545      
Original Building 219,766      
Costs Capitalized Subsequent to Acquisition 7,917      
Land and Improvements 72,545      
Building and Improvements 227,683      
Total 300,228      
Accumulated Depreciation $ 55,319      
Depreciable Lives (Years) [5] (1)      
680 Folsom Street | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 72,545      
Original Building 219,766      
Costs Capitalized Subsequent to Acquisition 7,917      
Land and Improvements 72,545      
Building and Improvements 227,683      
Total 300,228      
Accumulated Depreciation $ 55,319      
Depreciable Lives (Years) [6] (1)      
145 Broadway | Office Building [Member]        
Original Cost        
Original Land $ 121      
Original Building 273,013      
Costs Capitalized Subsequent to Acquisition 25,712      
Land and Improvements 23,367      
Building and Improvements 275,479      
Total 298,846      
Accumulated Depreciation $ 9,941      
Depreciable Lives (Years) [5] (1)      
145 Broadway | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 121      
Original Building 273,013      
Costs Capitalized Subsequent to Acquisition 25,509      
Land and Improvements 23,164      
Building and Improvements 275,479      
Total 298,643      
Accumulated Depreciation $ 9,941      
Depreciable Lives (Years) [6] (1)      
2200 Pennsylvania Avenue | Office Building [Member]        
Original Cost        
Original Land $ 0      
Original Building 183,541      
Costs Capitalized Subsequent to Acquisition 112,436      
Land and Improvements 107,356      
Building and Improvements 188,621      
Total 295,977      
Accumulated Depreciation $ 66,072      
Depreciable Lives (Years) [5] (1)      
2200 Pennsylvania Avenue | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 0      
Original Building 183,541      
Costs Capitalized Subsequent to Acquisition 112,436      
Land and Improvements 107,356      
Building and Improvements 188,621      
Total 295,977      
Accumulated Depreciation $ 66,072      
Depreciable Lives (Years) [6] (1)      
South of Market and Democracy Tower | Office Building [Member]        
Original Cost        
Original Land $ 13,603      
Original Building 237,479      
Costs Capitalized Subsequent to Acquisition 41,163      
Land and Improvements 13,687      
Building and Improvements 278,558      
Total 292,245      
Accumulated Depreciation $ 107,358      
Depreciable Lives (Years) [5] (1)      
South of Market and Democracy Tower | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 13,603      
Original Building 237,479      
Costs Capitalized Subsequent to Acquisition 40,827      
Land and Improvements 13,603      
Building and Improvements 278,306      
Total 291,909      
Accumulated Depreciation $ 107,279      
Depreciable Lives (Years) [6] (1)      
601 Massachusetts Avenue | Office Building [Member]        
Original Cost        
Original Land $ 95,310      
Original Building 165,173      
Costs Capitalized Subsequent to Acquisition 3,945      
Land and Improvements 95,322      
Building and Improvements 169,106      
Total 264,428      
Accumulated Depreciation $ 30,743      
Depreciable Lives (Years) [5] (1)      
601 Massachusetts Avenue | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 95,310      
Original Building 165,173      
Costs Capitalized Subsequent to Acquisition 3,933      
Land and Improvements 95,310      
Building and Improvements 169,106      
Total 264,416      
Accumulated Depreciation $ 30,743      
Depreciable Lives (Years) [6] (1)      
Bay Colony Corporate Center | Office Building [Member]        
Original Cost        
Original Land $ 18,789      
Original Building 148,451      
Costs Capitalized Subsequent to Acquisition 81,302      
Land and Improvements 18,789      
Building and Improvements 229,753      
Total 248,542      
Accumulated Depreciation $ 89,232      
Depreciable Lives (Years) [5] (1)      
Bay Colony Corporate Center | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 18,789      
Original Building 148,451      
Costs Capitalized Subsequent to Acquisition 81,302      
Land and Improvements 18,789      
Building and Improvements 229,753      
Total 248,542      
Accumulated Depreciation $ 89,232      
Depreciable Lives (Years) [6] (1)      
535 Mission Street | Office Building [Member]        
Original Cost        
Original Land $ 40,933      
Original Building 148,378      
Costs Capitalized Subsequent to Acquisition 3,287      
Land and Improvements 40,933      
Building and Improvements 151,665      
Total 192,598      
Accumulated Depreciation $ 31,953      
Depreciable Lives (Years) [5] (1)      
535 Mission Street | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 40,933      
Original Building 148,378      
Costs Capitalized Subsequent to Acquisition 3,287      
Land and Improvements 40,933      
Building and Improvements 151,665      
Total 192,598      
Accumulated Depreciation $ 31,953      
Depreciable Lives (Years) [6] (1)      
Mountain View Research Park | Office Building [Member]        
Original Cost        
Original Land $ 95,066      
Original Building 68,373      
Costs Capitalized Subsequent to Acquisition 18,479      
Land and Improvements 95,066      
Building and Improvements 86,852      
Total 181,918      
Accumulated Depreciation $ 21,725      
Depreciable Lives (Years) [5] (1)      
Mountain View Research Park | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 95,066      
Original Building 68,373      
Costs Capitalized Subsequent to Acquisition 18,479      
Land and Improvements 95,066      
Building and Improvements 86,852      
Total 181,918      
Accumulated Depreciation $ 21,725      
Depreciable Lives (Years) [6] (1)      
Reservoir Place | Office Building [Member]        
Original Cost        
Original Land $ 18,605      
Original Building 104,124      
Costs Capitalized Subsequent to Acquisition 57,154      
Land and Improvements 20,108      
Building and Improvements 159,775      
Total 179,883      
Accumulated Depreciation $ 76,993      
Depreciable Lives (Years) [5] (1)      
Reservoir Place | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 18,605      
Original Building 104,124      
Costs Capitalized Subsequent to Acquisition 53,079      
Land and Improvements 19,089      
Building and Improvements 156,719      
Total 175,808      
Accumulated Depreciation $ 75,841      
Depreciable Lives (Years) [6] (1)      
1330 Connecticut Avenue | Office Building [Member]        
Original Cost        
Original Land $ 25,982      
Original Building 82,311      
Costs Capitalized Subsequent to Acquisition 37,049      
Land and Improvements 27,135      
Building and Improvements 118,207      
Total 145,342      
Accumulated Depreciation $ 38,000      
Depreciable Lives (Years) [5] (1)      
1330 Connecticut Avenue | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 25,982      
Original Building 82,311      
Costs Capitalized Subsequent to Acquisition 32,436      
Land and Improvements 25,982      
Building and Improvements 114,747      
Total 140,729      
Accumulated Depreciation $ 36,695      
Depreciable Lives (Years) [6] (1)      
Kingstowne Towne Center | Office Building [Member]        
Original Cost        
Original Land $ 18,021      
Original Building 109,038      
Costs Capitalized Subsequent to Acquisition 3,299      
Land and Improvements 18,062      
Building and Improvements 112,296      
Total 130,358      
Accumulated Depreciation $ 46,469      
Depreciable Lives (Years) [5] (1)      
Kingstowne Towne Center | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 18,021      
Original Building 109,038      
Costs Capitalized Subsequent to Acquisition 3,135      
Land and Improvements 18,021      
Building and Improvements 112,173      
Total 130,194      
Accumulated Depreciation $ 46,430      
Depreciable Lives (Years) [6] (1)      
One Freedom Square | Office Building [Member]        
Original Cost        
Original Land $ 9,929      
Original Building 84,504      
Costs Capitalized Subsequent to Acquisition 39,884      
Land and Improvements 11,293      
Building and Improvements 123,024      
Total 134,317      
Accumulated Depreciation $ 62,808      
Depreciable Lives (Years) [5] (1)      
One Freedom Square | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 9,929      
Original Building 84,504      
Costs Capitalized Subsequent to Acquisition 34,247      
Land and Improvements 9,883      
Building and Improvements 118,797      
Total 128,680      
Accumulated Depreciation $ 61,215      
Depreciable Lives (Years) [6] (1)      
One and Two Reston Overlook | Office Building [Member]        
Original Cost        
Original Land $ 16,456      
Original Building 66,192      
Costs Capitalized Subsequent to Acquisition 46,762      
Land and Improvements 16,179      
Building and Improvements 113,231      
Total 129,410      
Accumulated Depreciation $ 57,441      
Depreciable Lives (Years) [5] (1)      
One and Two Reston Overlook | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 16,456      
Original Building 66,192      
Costs Capitalized Subsequent to Acquisition 42,344      
Land and Improvements 15,074      
Building and Improvements 109,918      
Total 124,992      
Accumulated Depreciation $ 56,191      
Depreciable Lives (Years) [6] (1)      
Weston Corporate Center | Office Building [Member]        
Original Cost        
Original Land $ 25,753      
Original Building 92,312      
Costs Capitalized Subsequent to Acquisition (5)      
Land and Improvements 25,854      
Building and Improvements 92,206      
Total 118,060      
Accumulated Depreciation $ 32,278      
Depreciable Lives (Years) [5] (1)      
Weston Corporate Center | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 25,753      
Original Building 92,312      
Costs Capitalized Subsequent to Acquisition (5)      
Land and Improvements 25,854      
Building and Improvements 92,206      
Total 118,060      
Accumulated Depreciation $ 32,278      
Depreciable Lives (Years) [6] (1)      
17Fifty Presidents Street | Office Building [Member]        
Original Cost        
Original Land $ 0      
Original Building 113,362      
Costs Capitalized Subsequent to Acquisition 0      
Land and Improvements 0      
Building and Improvements 113,362      
Total 113,362      
Accumulated Depreciation $ 3,466      
Depreciable Lives (Years) [5] (1)      
17Fifty Presidents Street | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 0      
Original Building 113,362      
Costs Capitalized Subsequent to Acquisition 0      
Land and Improvements 0      
Building and Improvements 113,362      
Total 113,362      
Accumulated Depreciation $ 3,466      
Depreciable Lives (Years) [6] (1)      
Two Freedom Square | Office Building [Member]        
Original Cost        
Original Land $ 13,930      
Original Building 77,739      
Costs Capitalized Subsequent to Acquisition 25,510      
Land and Improvements 15,420      
Building and Improvements 101,759      
Total 117,179      
Accumulated Depreciation $ 53,885      
Depreciable Lives (Years) [5] (1)      
Two Freedom Square | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 13,930      
Original Building 77,739      
Costs Capitalized Subsequent to Acquisition 19,298      
Land and Improvements 13,866      
Building and Improvements 97,101      
Total 110,967      
Accumulated Depreciation $ 52,128      
Depreciable Lives (Years) [6] (1)      
140 Kendrick Street | Office Building [Member]        
Original Cost        
Original Land $ 18,095      
Original Building 66,905      
Costs Capitalized Subsequent to Acquisition 26,458      
Land and Improvements 19,092      
Building and Improvements 92,366      
Total 111,458      
Accumulated Depreciation $ 35,918      
Depreciable Lives (Years) [5] (1)      
140 Kendrick Street | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 18,095      
Original Building 66,905      
Costs Capitalized Subsequent to Acquisition 22,468      
Land and Improvements 18,095      
Building and Improvements 89,373      
Total 107,468      
Accumulated Depreciation $ 34,790      
Depreciable Lives (Years) [6] (1)      
355 Main Street | Office Building [Member]        
Original Cost        
Original Land $ 18,863      
Original Building 53,346      
Costs Capitalized Subsequent to Acquisition 27,593      
Land and Improvements 21,173      
Building and Improvements 78,629      
Total 99,802      
Accumulated Depreciation $ 29,479      
Depreciable Lives (Years) [5] (1)      
355 Main Street | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 18,863      
Original Building 53,346      
Costs Capitalized Subsequent to Acquisition 27,295      
Land and Improvements 21,098      
Building and Improvements 78,406      
Total 99,504      
Accumulated Depreciation $ 29,397      
Depreciable Lives (Years) [6] (1)      
Discovery Square | Office Building [Member]        
Original Cost        
Original Land $ 11,198      
Original Building 71,782      
Costs Capitalized Subsequent to Acquisition 20,742      
Land and Improvements 12,533      
Building and Improvements 91,189      
Total 103,722      
Accumulated Depreciation $ 45,920      
Depreciable Lives (Years) [5] (1)      
Discovery Square | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 11,198      
Original Building 71,782      
Costs Capitalized Subsequent to Acquisition 15,197      
Land and Improvements 11,146      
Building and Improvements 87,031      
Total 98,177      
Accumulated Depreciation $ 44,352      
Depreciable Lives (Years) [6] (1)      
880 & 890 Winter Street | Office Building [Member]        
Original Cost        
Original Land $ 29,510      
Original Building 65,812      
Costs Capitalized Subsequent to Acquisition 1,367      
Land and Improvements 29,510      
Building and Improvements 66,561      
Land held for development 618      
Total 96,689      
Accumulated Depreciation $ 5,706      
Depreciable Lives (Years) [5] (1)      
880 & 890 Winter Street | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 29,510      
Original Building 65,812      
Costs Capitalized Subsequent to Acquisition 1,367      
Land and Improvements 29,510      
Building and Improvements 66,561      
Land held for development 618      
Total 96,689      
Accumulated Depreciation $ 5,706      
Depreciable Lives (Years) [6] (1)      
10 CityPoint | Office Building [Member]        
Original Cost        
Original Land $ 1,953      
Original Building 85,752      
Costs Capitalized Subsequent to Acquisition 4,744      
Land and Improvements 2,290      
Building and Improvements 90,159      
Total 92,449      
Accumulated Depreciation $ 14,073      
Depreciable Lives (Years) [5] (1)      
10 CityPoint | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 1,953      
Original Building 85,752      
Costs Capitalized Subsequent to Acquisition 4,581      
Land and Improvements 2,127      
Building and Improvements 90,159      
Total 92,286      
Accumulated Depreciation $ 14,073      
Depreciable Lives (Years) [6] (1)      
90 Broadway | Office Building [Member]        
Original Cost        
Original Land $ 19,104      
Original Building 52,078      
Costs Capitalized Subsequent to Acquisition 18,077      
Land and Improvements 20,785      
Building and Improvements 68,474      
Total 89,259      
Accumulated Depreciation $ 24,200      
Depreciable Lives (Years) [5] (1)      
90 Broadway | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 19,104      
Original Building 52,078      
Costs Capitalized Subsequent to Acquisition 17,898      
Land and Improvements 20,741      
Building and Improvements 68,339      
Total 89,080      
Accumulated Depreciation $ 24,156      
Depreciable Lives (Years) [6] (1)      
77 CityPoint | Office Building [Member]        
Original Cost        
Original Land $ 13,847      
Original Building 60,383      
Costs Capitalized Subsequent to Acquisition 11,937      
Land and Improvements 14,023      
Building and Improvements 72,144      
Total 86,167      
Accumulated Depreciation $ 29,691      
Depreciable Lives (Years) [5] (1)      
77 CityPoint | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 13,847      
Original Building 60,383      
Costs Capitalized Subsequent to Acquisition 11,832      
Land and Improvements 13,997      
Building and Improvements 72,065      
Total 86,062      
Accumulated Depreciation $ 29,665      
Depreciable Lives (Years) [6] (1)      
230 CityPoint | Office Building [Member]        
Original Cost        
Original Land $ 13,189      
Original Building 49,823      
Costs Capitalized Subsequent to Acquisition 23,958      
Land and Improvements 13,807      
Building and Improvements 73,163      
Total 86,970      
Accumulated Depreciation $ 32,678      
Depreciable Lives (Years) [5] (1)      
230 CityPoint | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 13,189      
Original Building 49,823      
Costs Capitalized Subsequent to Acquisition 22,341      
Land and Improvements 13,403      
Building and Improvements 71,950      
Total 85,353      
Accumulated Depreciation $ 32,224      
Depreciable Lives (Years) [6] (1)      
Waltham Weston Corporate Center | Office Building [Member]        
Original Cost        
Original Land $ 10,385      
Original Building 60,694      
Costs Capitalized Subsequent to Acquisition 13,151      
Land and Improvements 11,097      
Building and Improvements 73,133      
Total 84,230      
Accumulated Depreciation $ 38,118      
Depreciable Lives (Years) [5] (1)      
Waltham Weston Corporate Center | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 10,385      
Original Building 60,694      
Costs Capitalized Subsequent to Acquisition 10,164      
Land and Improvements 10,350      
Building and Improvements 70,893      
Total 81,243      
Accumulated Depreciation $ 37,273      
Depreciable Lives (Years) [6] (1)      
3625 - 3635 Peterson Way | Office Building [Member]        
Original Cost        
Original Land $ 63,206      
Original Building 14,879      
Costs Capitalized Subsequent to Acquisition 907      
Land and Improvements 63,206      
Building and Improvements 14,879      
Land held for development 907      
Total 78,992      
Accumulated Depreciation $ 14,198      
Depreciable Lives (Years) [5] (1)      
3625 - 3635 Peterson Way | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 63,206      
Original Building 14,879      
Costs Capitalized Subsequent to Acquisition 907      
Land and Improvements 63,206      
Building and Improvements 14,879      
Land held for development 907      
Total 78,992      
Accumulated Depreciation $ 14,198      
Depreciable Lives (Years) [6] (1)      
20 Citypoint | Office Building [Member]        
Original Cost        
Original Land $ 4,887      
Original Building 72,764      
Costs Capitalized Subsequent to Acquisition 0      
Land and Improvements 4,887      
Building and Improvements 72,764      
Total 77,651      
Accumulated Depreciation $ 3,325      
Depreciable Lives (Years) [5] (1)      
20 Citypoint | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 4,887      
Original Building 72,764      
Costs Capitalized Subsequent to Acquisition 0      
Land and Improvements 4,887      
Building and Improvements 72,764      
Total 77,651      
Accumulated Depreciation $ 3,325      
Depreciable Lives (Years) [6] (1)      
2440 West El Camino Real | Office Building [Member]        
Original Cost        
Original Land $ 16,741      
Original Building 51,285      
Costs Capitalized Subsequent to Acquisition 5,518      
Land and Improvements 16,741      
Building and Improvements 56,803      
Total 73,544      
Accumulated Depreciation $ 15,215      
Depreciable Lives (Years) [5] (1)      
2440 West El Camino Real | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 16,741      
Original Building 51,285      
Costs Capitalized Subsequent to Acquisition 5,518      
Land and Improvements 16,741      
Building and Improvements 56,803      
Total 73,544      
Accumulated Depreciation $ 15,215      
Depreciable Lives (Years) [6] (1)      
191 Spring Street | Office Building [Member]        
Original Cost        
Original Land $ 2,850      
Original Building 59,751      
Costs Capitalized Subsequent to Acquisition 7,543      
Land and Improvements 3,151      
Building and Improvements 66,993      
Total 70,144      
Accumulated Depreciation $ 24,275      
Depreciable Lives (Years) [5] (1)      
191 Spring Street | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 2,850      
Original Building 59,751      
Costs Capitalized Subsequent to Acquisition 6,911      
Land and Improvements 2,850      
Building and Improvements 66,662      
Total 69,512      
Accumulated Depreciation $ 24,150      
Depreciable Lives (Years) [6] (1)      
300 Binney Street | Office Building [Member]        
Original Cost        
Original Land $ 18,080      
Original Building 51,262      
Costs Capitalized Subsequent to Acquisition 140      
Land and Improvements 18,080      
Building and Improvements 51,402      
Total 69,482      
Accumulated Depreciation $ 12,842      
Depreciable Lives (Years) [5] (1)      
300 Binney Street | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 18,080      
Original Building 51,262      
Costs Capitalized Subsequent to Acquisition 140      
Land and Improvements 18,080      
Building and Improvements 51,402      
Total 69,482      
Accumulated Depreciation $ 12,842      
Depreciable Lives (Years) [6] (1)      
Wisconsin Place | Office Building [Member]        
Original Cost        
Original Land $ 0      
Original Building 53,349      
Costs Capitalized Subsequent to Acquisition 14,771      
Land and Improvements 0      
Building and Improvements 68,120      
Total 68,120      
Accumulated Depreciation $ 28,305      
Depreciable Lives (Years) [5] (1)      
Wisconsin Place | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 0      
Original Building 53,349      
Costs Capitalized Subsequent to Acquisition 14,771      
Land and Improvements 0      
Building and Improvements 68,120      
Total 68,120      
Accumulated Depreciation $ 28,305      
Depreciable Lives (Years) [6] (1)      
Reston Corporate Center | Office Building [Member]        
Original Cost        
Original Land $ 9,135      
Original Building 50,857      
Costs Capitalized Subsequent to Acquisition 6,236      
Land and Improvements 10,148      
Building and Improvements 56,080      
Total 66,228      
Accumulated Depreciation $ 31,405      
Depreciable Lives (Years) [5] (1)      
Reston Corporate Center | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 9,135      
Original Building 50,857      
Costs Capitalized Subsequent to Acquisition 3,625      
Land and Improvements 9,496      
Building and Improvements 54,121      
Total 63,617      
Accumulated Depreciation $ 30,666      
Depreciable Lives (Years) [6] (1)      
200 West Street | Office Building [Member]        
Original Cost        
Original Land $ 16,148      
Original Building 24,983      
Costs Capitalized Subsequent to Acquisition 21,102      
Land and Improvements 16,813      
Building and Improvements 30,496      
Land held for development 317      
Development and Construction in Progress 14,607      
Total 62,233      
Accumulated Depreciation $ 18,585      
Depreciable Lives (Years) [5] (1)      
200 West Street | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 16,148      
Original Building 24,983      
Costs Capitalized Subsequent to Acquisition 18,441      
Land and Improvements 16,148      
Building and Improvements 28,500      
Land held for development 317      
Development and Construction in Progress 14,607      
Total 59,572      
Accumulated Depreciation $ 17,832      
Depreciable Lives (Years) [6] (1)      
255 Main Street | Office Building [Member]        
Original Cost        
Original Land $ 134      
Original Building 25,110      
Costs Capitalized Subsequent to Acquisition 34,107      
Land and Improvements 548      
Building and Improvements 58,803      
Total 59,351      
Accumulated Depreciation $ 37,353      
Depreciable Lives (Years) [5] (1)      
255 Main Street | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 134      
Original Building 25,110      
Costs Capitalized Subsequent to Acquisition 32,451      
Land and Improvements 134      
Building and Improvements 57,561      
Total 57,695      
Accumulated Depreciation $ 36,887      
Depreciable Lives (Years) [6] (1)      
University Place | Office Building [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,491      
Original Cost        
Original Land 0      
Original Building 37,091      
Costs Capitalized Subsequent to Acquisition 16,745      
Land and Improvements 6,909      
Building and Improvements 46,927      
Total 53,836      
Accumulated Depreciation $ 30,983      
Depreciable Lives (Years) [5] (1)      
University Place | Boston Properties Limited Partnership | Office Building [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,491      
Original Cost        
Original Land 0      
Original Building 37,091      
Costs Capitalized Subsequent to Acquisition 15,295      
Land and Improvements 6,546      
Building and Improvements 45,840      
Total 52,386      
Accumulated Depreciation $ 30,577      
Depreciable Lives (Years) [6] (1)      
Sumner Square | Office Building [Member]        
Original Cost        
Original Land $ 624      
Original Building 28,745      
Costs Capitalized Subsequent to Acquisition 20,396      
Land and Improvements 2,251      
Building and Improvements 47,514      
Total 49,765      
Accumulated Depreciation $ 28,329      
Depreciable Lives (Years) [5] (1)      
Sumner Square | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 624      
Original Building 28,745      
Costs Capitalized Subsequent to Acquisition 18,316      
Land and Improvements 1,731      
Building and Improvements 45,954      
Total 47,685      
Accumulated Depreciation $ 27,744      
Depreciable Lives (Years) [6] (1)      
North First Business Park | Office Building [Member]        
Original Cost        
Original Land $ 23,398      
Original Building 13,069      
Costs Capitalized Subsequent to Acquisition 4,580      
Land and Improvements 23,377      
Building and Improvements 17,670      
Total 41,047      
Accumulated Depreciation $ 16,749      
Depreciable Lives (Years) [5] (1)      
North First Business Park | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 23,398      
Original Building 13,069      
Costs Capitalized Subsequent to Acquisition 4,557      
Land and Improvements 23,371      
Building and Improvements 17,653      
Total 41,024      
Accumulated Depreciation $ 16,743      
Depreciable Lives (Years) [6] (1)      
Capital Gallery | Office Building [Member]        
Original Cost        
Original Land $ 4,725      
Original Building 29,565      
Costs Capitalized Subsequent to Acquisition 8,679      
Land and Improvements 8,662      
Building and Improvements 34,307      
Total 42,969      
Accumulated Depreciation $ 21,150      
Depreciable Lives (Years) [5] (1)      
Capital Gallery | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 4,725      
Original Building 29,565      
Costs Capitalized Subsequent to Acquisition 4,016      
Land and Improvements 6,128      
Building and Improvements 32,178      
Total 38,306      
Accumulated Depreciation $ 20,348      
Depreciable Lives (Years) [6] (1)      
150 Broadway | Office Building [Member]        
Original Cost        
Original Land $ 850      
Original Building 25,042      
Costs Capitalized Subsequent to Acquisition 2,253      
Land and Improvements 1,323      
Building and Improvements 26,822      
Total 28,145      
Accumulated Depreciation $ 14,154      
Depreciable Lives (Years) [5] (1)      
150 Broadway | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 850      
Original Building 25,042      
Costs Capitalized Subsequent to Acquisition 248      
Land and Improvements 822      
Building and Improvements 25,318      
Total 26,140      
Accumulated Depreciation $ 13,584      
Depreciable Lives (Years) [6] (1)      
105 Broadway | Office Building [Member]        
Original Cost        
Original Land $ 1,299      
Original Building 12,943      
Costs Capitalized Subsequent to Acquisition 12,723      
Land and Improvements 2,395      
Building and Improvements 24,570      
Total 26,965      
Accumulated Depreciation $ 13,041      
Depreciable Lives (Years) [5] (1)      
105 Broadway | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 1,299      
Original Building 12,943      
Costs Capitalized Subsequent to Acquisition 10,617      
Land and Improvements 1,868      
Building and Improvements 22,991      
Total 24,859      
Accumulated Depreciation $ 12,445      
Depreciable Lives (Years) [6] (1)      
Lexington Office Park | Office Building [Member]        
Original Cost        
Original Land $ 998      
Original Building 1,426      
Costs Capitalized Subsequent to Acquisition 18,567      
Land and Improvements 1,264      
Building and Improvements 19,727      
Total 20,991      
Accumulated Depreciation $ 15,289      
Depreciable Lives (Years) [5] (1)      
Lexington Office Park | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 998      
Original Building 1,426      
Costs Capitalized Subsequent to Acquisition 17,803      
Land and Improvements 1,073      
Building and Improvements 19,154      
Total 20,227      
Accumulated Depreciation $ 15,076      
Depreciable Lives (Years) [6] (1)      
201 Spring Street | Office Building [Member]        
Original Cost        
Original Land $ 2,849      
Original Building 15,303      
Costs Capitalized Subsequent to Acquisition 1,124      
Land and Improvements 3,124      
Building and Improvements 16,152      
Total 19,276      
Accumulated Depreciation $ 8,985      
Depreciable Lives (Years) [5] (1)      
201 Spring Street | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 2,849      
Original Building 15,303      
Costs Capitalized Subsequent to Acquisition 25      
Land and Improvements 2,849      
Building and Improvements 15,328      
Total 18,177      
Accumulated Depreciation $ 8,672      
Depreciable Lives (Years) [6] (1)      
The Point | Office Building [Member]        
Original Cost        
Original Land $ 6,395      
Original Building 10,040      
Costs Capitalized Subsequent to Acquisition 421      
Land and Improvements 6,492      
Building and Improvements 10,364      
Total 16,856      
Accumulated Depreciation $ 1,667      
Depreciable Lives (Years) [5] (1)      
The Point | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 6,395      
Original Building 10,040      
Costs Capitalized Subsequent to Acquisition 421      
Land and Improvements 6,492      
Building and Improvements 10,364      
Total 16,856      
Accumulated Depreciation $ 1,667      
Depreciable Lives (Years) [6] (1)      
690 Folsom Street | Office Building [Member]        
Original Cost        
Original Land $ 3,219      
Original Building 11,038      
Costs Capitalized Subsequent to Acquisition 1,157      
Land and Improvements 3,219      
Building and Improvements 12,195      
Total 15,414      
Accumulated Depreciation $ 2,778      
Depreciable Lives (Years) [5] (1)      
690 Folsom Street | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 3,219      
Original Building 11,038      
Costs Capitalized Subsequent to Acquisition 1,157      
Land and Improvements 3,219      
Building and Improvements 12,195      
Total 15,414      
Accumulated Depreciation $ 2,778      
Depreciable Lives (Years) [6] (1)      
33 Hayden Avenue | Office Building [Member]        
Original Cost        
Original Land $ 266      
Original Building 3,234      
Costs Capitalized Subsequent to Acquisition 11,566      
Land and Improvements 425      
Building and Improvements 14,641      
Total 15,066      
Accumulated Depreciation $ 5,674      
Depreciable Lives (Years) [5] (1)      
33 Hayden Avenue | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 266      
Original Building 3,234      
Costs Capitalized Subsequent to Acquisition 10,929      
Land and Improvements 266      
Building and Improvements 14,163      
Total 14,429      
Accumulated Depreciation $ 5,494      
Depreciable Lives (Years) [6] (1)      
92-100 Hayden Avenue | Office Building [Member]        
Original Cost        
Original Land $ 594      
Original Building 6,748      
Costs Capitalized Subsequent to Acquisition 7,669      
Land and Improvements 802      
Building and Improvements 14,209      
Total 15,011      
Accumulated Depreciation $ 12,507      
Depreciable Lives (Years) [5] (1)      
92-100 Hayden Avenue | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 594      
Original Building 6,748      
Costs Capitalized Subsequent to Acquisition 6,940      
Land and Improvements 619      
Building and Improvements 13,663      
Total 14,282      
Accumulated Depreciation $ 12,300      
Depreciable Lives (Years) [6] (1)      
181 Spring Street | Office Building [Member]        
Original Cost        
Original Land $ 1,066      
Original Building 9,520      
Costs Capitalized Subsequent to Acquisition 2,177      
Land and Improvements 1,160      
Building and Improvements 11,603      
Total 12,763      
Accumulated Depreciation $ 5,908      
Depreciable Lives (Years) [5] (1)      
181 Spring Street | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 1,066      
Original Building 9,520      
Costs Capitalized Subsequent to Acquisition 1,800      
Land and Improvements 1,066      
Building and Improvements 11,320      
Total 12,386      
Accumulated Depreciation $ 5,802      
Depreciable Lives (Years) [6] (1)      
195 West Street | Office Building [Member]        
Original Cost        
Original Land $ 1,611      
Original Building 6,652      
Costs Capitalized Subsequent to Acquisition 4,221      
Land and Improvements 1,858      
Building and Improvements 10,626      
Total 12,484      
Accumulated Depreciation $ 8,589      
Depreciable Lives (Years) [5] (1)      
195 West Street | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 1,611      
Original Building 6,652      
Costs Capitalized Subsequent to Acquisition 3,232      
Land and Improvements 1,611      
Building and Improvements 9,884      
Total 11,495      
Accumulated Depreciation $ 8,306      
Depreciable Lives (Years) [6] (1)      
7501 Boston Boulevard, Building Seven | Office Building [Member]        
Original Cost        
Original Land $ 665      
Original Building 9,273      
Costs Capitalized Subsequent to Acquisition 819      
Land and Improvements 791      
Building and Improvements 9,966      
Total 10,757      
Accumulated Depreciation $ 5,665      
Depreciable Lives (Years) [5] (1)      
7501 Boston Boulevard, Building Seven | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 665      
Original Building 9,273      
Costs Capitalized Subsequent to Acquisition 314      
Land and Improvements 665      
Building and Improvements 9,587      
Total 10,252      
Accumulated Depreciation $ 5,520      
Depreciable Lives (Years) [6] (1)      
7435 Boston Boulevard, Building One | Office Building [Member]        
Original Cost        
Original Land $ 392      
Original Building 3,822      
Costs Capitalized Subsequent to Acquisition 5,016      
Land and Improvements 659      
Building and Improvements 8,571      
Total 9,230      
Accumulated Depreciation $ 6,756      
Depreciable Lives (Years) [5] (1)      
7435 Boston Boulevard, Building One | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 392      
Original Building 3,822      
Costs Capitalized Subsequent to Acquisition 4,323      
Land and Improvements 486      
Building and Improvements 8,051      
Total 8,537      
Accumulated Depreciation $ 6,561      
Depreciable Lives (Years) [6] (1)      
32 Hartwell Avenue | Office Building [Member]        
Original Cost        
Original Land $ 168      
Original Building 1,943      
Costs Capitalized Subsequent to Acquisition 6,944      
Land and Improvements 314      
Building and Improvements 8,741      
Total 9,055      
Accumulated Depreciation $ 2,365      
Depreciable Lives (Years) [5] (1)      
32 Hartwell Avenue | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 168      
Original Building 1,943      
Costs Capitalized Subsequent to Acquisition 6,358      
Land and Improvements 168      
Building and Improvements 8,301      
Total 8,469      
Accumulated Depreciation $ 2,199      
Depreciable Lives (Years) [6] (1)      
7450 Boston Boulevard, Building Three | Office Building [Member]        
Original Cost        
Original Land $ 1,165      
Original Building 4,681      
Costs Capitalized Subsequent to Acquisition 2,591      
Land and Improvements 1,430      
Building and Improvements 7,007      
Total 8,437      
Accumulated Depreciation $ 4,103      
Depreciable Lives (Years) [5] (1)      
7450 Boston Boulevard, Building Three | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 1,165      
Original Building 4,681      
Costs Capitalized Subsequent to Acquisition 2,177      
Land and Improvements 1,327      
Building and Improvements 6,696      
Total 8,023      
Accumulated Depreciation $ 3,983      
Depreciable Lives (Years) [6] (1)      
250 Binney Street | Office Building [Member]        
Original Cost        
Original Land $ 110      
Original Building 4,483      
Costs Capitalized Subsequent to Acquisition 3,593      
Land and Improvements 273      
Building and Improvements 7,913      
Total 8,186      
Accumulated Depreciation $ 6,211      
Depreciable Lives (Years) [5] (1)      
250 Binney Street | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 110      
Original Building 4,483      
Costs Capitalized Subsequent to Acquisition 2,939      
Land and Improvements 110      
Building and Improvements 7,422      
Total 7,532      
Accumulated Depreciation $ 6,030      
Depreciable Lives (Years) [6] (1)      
8000 Grainger Court Building Five | Office Building [Member]        
Original Cost        
Original Land $ 366      
Original Building 4,282      
Costs Capitalized Subsequent to Acquisition 3,198      
Land and Improvements 601      
Building and Improvements 7,245      
Total 7,846      
Accumulated Depreciation $ 5,923      
Depreciable Lives (Years) [5] (1)      
8000 Grainger Court Building Five | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 366      
Original Building 4,282      
Costs Capitalized Subsequent to Acquisition 2,604      
Land and Improvements 453      
Building and Improvements 6,799      
Total 7,252      
Accumulated Depreciation $ 5,756      
Depreciable Lives (Years) [6] (1)      
453 Ravendale Drive | Office Building [Member]        
Original Cost        
Original Land $ 5,477      
Original Building 1,090      
Costs Capitalized Subsequent to Acquisition 676      
Land and Improvements 5,477      
Building and Improvements 1,766      
Total 7,243      
Accumulated Depreciation $ 819      
Depreciable Lives (Years) [5] (1)      
453 Ravendale Drive | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 5,477      
Original Building 1,090      
Costs Capitalized Subsequent to Acquisition 676      
Land and Improvements 5,477      
Building and Improvements 1,766      
Total 7,243      
Accumulated Depreciation $ 819      
Depreciable Lives (Years) [6] (1)      
7300 Boston Boulevard Building Thirteen | Office Building [Member]        
Original Cost        
Original Land $ 608      
Original Building 4,773      
Costs Capitalized Subsequent to Acquisition 1,075      
Land and Improvements 661      
Building and Improvements 5,795      
Total 6,456      
Accumulated Depreciation $ 2,269      
Depreciable Lives (Years) [5] (1)      
7300 Boston Boulevard Building Thirteen | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 608      
Original Building 4,773      
Costs Capitalized Subsequent to Acquisition 863      
Land and Improvements 608      
Building and Improvements 5,636      
Total 6,244      
Accumulated Depreciation $ 2,209      
Depreciable Lives (Years) [6] (1)      
17 Hartwell Avenue | Office Building [Member]        
Original Cost        
Original Land $ 26      
Original Building 150      
Costs Capitalized Subsequent to Acquisition 6,064      
Land and Improvements 65      
Building and Improvements 6,175      
Total 6,240      
Accumulated Depreciation $ 2,487      
Depreciable Lives (Years) [5] (1)      
17 Hartwell Avenue | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 26      
Original Building 150      
Costs Capitalized Subsequent to Acquisition 5,907      
Land and Improvements 26      
Building and Improvements 6,057      
Total 6,083      
Accumulated Depreciation $ 2,442      
Depreciable Lives (Years) [6] (1)      
7601 Boston Boulevard Building Eight | Office Building [Member]        
Original Cost        
Original Land $ 200      
Original Building 878      
Costs Capitalized Subsequent to Acquisition 5,035      
Land and Improvements 551      
Building and Improvements 5,562      
Total 6,113      
Accumulated Depreciation $ 4,838      
Depreciable Lives (Years) [5] (1)      
7601 Boston Boulevard Building Eight | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 200      
Original Building 878      
Costs Capitalized Subsequent to Acquisition 4,342      
Land and Improvements 378      
Building and Improvements 5,042      
Total 5,420      
Accumulated Depreciation $ 4,643      
Depreciable Lives (Years) [6] (1)      
7500 Boston Boulevard Building Six | Office Building [Member]        
Original Cost        
Original Land $ 138      
Original Building 3,749      
Costs Capitalized Subsequent to Acquisition 1,640      
Land and Improvements 367      
Building and Improvements 5,160      
Total 5,527      
Accumulated Depreciation $ 4,399      
Depreciable Lives (Years) [5] (1)      
7500 Boston Boulevard Building Six | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 138      
Original Building 3,749      
Costs Capitalized Subsequent to Acquisition 1,107      
Land and Improvements 234      
Building and Improvements 4,760      
Total 4,994      
Accumulated Depreciation $ 4,249      
Depreciable Lives (Years) [6] (1)      
8000 Corporate Court Building Eleven | Office Building [Member]        
Original Cost        
Original Land $ 136      
Original Building 3,071      
Costs Capitalized Subsequent to Acquisition 1,649      
Land and Improvements 774      
Building and Improvements 4,082      
Total 4,856      
Accumulated Depreciation $ 3,320      
Depreciable Lives (Years) [5] (1)      
8000 Corporate Court Building Eleven | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 136      
Original Building 3,071      
Costs Capitalized Subsequent to Acquisition 1,298      
Land and Improvements 686      
Building and Improvements 3,819      
Total 4,505      
Accumulated Depreciation $ 3,217      
Depreciable Lives (Years) [6] (1)      
7375 Boston Boulevard Building Ten | Office Building [Member]        
Original Cost        
Original Land $ 23      
Original Building 2,685      
Costs Capitalized Subsequent to Acquisition 1,035      
Land and Improvements 93      
Building and Improvements 3,650      
Total 3,743      
Accumulated Depreciation $ 2,724      
Depreciable Lives (Years) [5] (1)      
7375 Boston Boulevard Building Ten | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 23      
Original Building 2,685      
Costs Capitalized Subsequent to Acquisition 854      
Land and Improvements 47      
Building and Improvements 3,515      
Total 3,562      
Accumulated Depreciation $ 2,676      
Depreciable Lives (Years) [6] (1)      
7374 Boston Boulevard Building Four | Office Building [Member]        
Original Cost        
Original Land $ 241      
Original Building 1,605      
Costs Capitalized Subsequent to Acquisition 1,821      
Land and Improvements 398      
Building and Improvements 3,269      
Total 3,667      
Accumulated Depreciation $ 2,870      
Depreciable Lives (Years) [5] (1)      
7374 Boston Boulevard Building Four | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 241      
Original Building 1,605      
Costs Capitalized Subsequent to Acquisition 1,438      
Land and Improvements 303      
Building and Improvements 2,981      
Total 3,284      
Accumulated Depreciation $ 2,765      
Depreciable Lives (Years) [6] (1)      
7451 Boston Boulevard Building Two | Office Building [Member]        
Original Cost        
Original Land $ 249      
Original Building 1,542      
Costs Capitalized Subsequent to Acquisition 1,658      
Land and Improvements 613      
Building and Improvements 2,836      
Total 3,449      
Accumulated Depreciation $ 2,699      
Depreciable Lives (Years) [5] (1)      
7451 Boston Boulevard Building Two | Boston Properties Limited Partnership | Office Building [Member]        
Original Cost        
Original Land $ 249      
Original Building 1,542      
Costs Capitalized Subsequent to Acquisition 1,345      
Land and Improvements 535      
Building and Improvements 2,601      
Total 3,136      
Accumulated Depreciation $ 2,609      
Depreciable Lives (Years) [6] (1)      
The Skylyne | Residential Building        
Original Cost        
Original Land $ 28,962      
Original Building 239,077      
Costs Capitalized Subsequent to Acquisition 0      
Land and Improvements 28,962      
Building and Improvements 239,077      
Total 268,039      
Accumulated Depreciation $ 2,128      
Depreciable Lives (Years) [5] (1)      
The Skylyne | Boston Properties Limited Partnership | Residential Building        
Original Cost        
Original Land $ 28,962      
Original Building 239,077      
Costs Capitalized Subsequent to Acquisition 0      
Land and Improvements 28,962      
Building and Improvements 239,077      
Total 268,039      
Accumulated Depreciation $ 2,128      
Depreciable Lives (Years) [6] (1)      
Signature at Reston | Residential Building        
Original Cost        
Original Land $ 27,076      
Original Building 190,580      
Costs Capitalized Subsequent to Acquisition 659      
Land and Improvements 27,076      
Building and Improvements 191,239      
Total 218,315      
Accumulated Depreciation $ 13,650      
Depreciable Lives (Years) [5] (1)      
Signature at Reston | Boston Properties Limited Partnership | Residential Building        
Original Cost        
Original Land $ 27,076      
Original Building 190,580      
Costs Capitalized Subsequent to Acquisition 659      
Land and Improvements 27,076      
Building and Improvements 191,239      
Total 218,315      
Accumulated Depreciation $ 13,650      
Depreciable Lives (Years) [6] (1)      
Proto Kendall Square | Residential Building        
Original Cost        
Original Land $ 9,243      
Original Building 127,248      
Costs Capitalized Subsequent to Acquisition 3,336      
Land and Improvements 9,245      
Building and Improvements 130,582      
Total 139,827      
Accumulated Depreciation $ 7,883      
Depreciable Lives (Years) [5] (1)      
Proto Kendall Square | Boston Properties Limited Partnership | Residential Building        
Original Cost        
Original Land $ 9,243      
Original Building 127,248      
Costs Capitalized Subsequent to Acquisition 3,336      
Land and Improvements 9,245      
Building and Improvements 130,582      
Total 139,827      
Accumulated Depreciation $ 7,883      
Depreciable Lives (Years) [6] (1)      
The Avant at Reston Town Center | Residential Building        
Original Cost        
Original Land $ 20,350      
Original Building 91,995      
Costs Capitalized Subsequent to Acquisition 846      
Land and Improvements 20,350      
Building and Improvements 92,841      
Total 113,191      
Accumulated Depreciation $ 17,204      
Depreciable Lives (Years) [5] (1)      
The Avant at Reston Town Center | Boston Properties Limited Partnership | Residential Building        
Original Cost        
Original Land $ 20,350      
Original Building 91,995      
Costs Capitalized Subsequent to Acquisition 846      
Land and Improvements 20,350      
Building and Improvements 92,841      
Total 113,191      
Accumulated Depreciation $ 17,204      
Depreciable Lives (Years) [6] (1)      
The Lofts at Atlantic Wharf | Residential Building        
Original Cost        
Original Land $ 3,529      
Original Building 54,891      
Costs Capitalized Subsequent to Acquisition 2,129      
Land and Improvements 3,529      
Building and Improvements 57,020      
Total 60,549      
Accumulated Depreciation $ 14,166      
Depreciable Lives (Years) [5] (1)      
The Lofts at Atlantic Wharf | Boston Properties Limited Partnership | Residential Building        
Original Cost        
Original Land $ 3,529      
Original Building 54,891      
Costs Capitalized Subsequent to Acquisition 2,129      
Land and Improvements 3,529      
Building and Improvements 57,020      
Total 60,549      
Accumulated Depreciation $ 14,166      
Depreciable Lives (Years) [6] (1)      
Boston Cambridge Marriott | Hotel [Member]        
Original Cost        
Original Land $ 478      
Original Building 37,918      
Costs Capitalized Subsequent to Acquisition 35,486      
Land and Improvements 1,201      
Building and Improvements 72,681      
Total 73,882      
Accumulated Depreciation $ 49,103      
Depreciable Lives (Years) [5] (1)      
Boston Cambridge Marriott | Boston Properties Limited Partnership | Hotel [Member]        
Original Cost        
Original Land $ 478      
Original Building 37,918      
Costs Capitalized Subsequent to Acquisition 32,595      
Land and Improvements 478      
Building and Improvements 70,513      
Total 70,991      
Accumulated Depreciation $ 48,286      
Depreciable Lives (Years) [6] (1)      
Kendall Center Green Garage | Garage        
Original Cost        
Original Land $ 0      
Original Building 35,035      
Costs Capitalized Subsequent to Acquisition 6,846      
Land and Improvements 103      
Building and Improvements 41,778      
Total 41,881      
Accumulated Depreciation $ 14,442      
Depreciable Lives (Years) [5] (1)      
Kendall Center Green Garage | Boston Properties Limited Partnership | Garage        
Original Cost        
Original Land $ 0      
Original Building 35,035      
Costs Capitalized Subsequent to Acquisition 6,432      
Land and Improvements 0      
Building and Improvements 41,467      
Total 41,467      
Accumulated Depreciation $ 14,327      
Depreciable Lives (Years) [6] (1)      
Kendall Center Yellow Garage | Garage        
Original Cost        
Original Land $ 1,256      
Original Building 15,697      
Costs Capitalized Subsequent to Acquisition 1,552      
Land and Improvements 1,434      
Building and Improvements 17,071      
Total 18,505      
Accumulated Depreciation $ 6,485      
Depreciable Lives (Years) [5] (1)      
Kendall Center Yellow Garage | Boston Properties Limited Partnership | Garage        
Original Cost        
Original Land $ 1,256      
Original Building 15,697      
Costs Capitalized Subsequent to Acquisition 840      
Land and Improvements 1,256      
Building and Improvements 16,537      
Total 17,793      
Accumulated Depreciation $ 6,287      
Depreciable Lives (Years) [6] (1)      
Kendall Center Blue Garage | Garage        
Original Cost        
Original Land $ 1,163      
Original Building 11,633      
Costs Capitalized Subsequent to Acquisition 2,111      
Land and Improvements 1,579      
Building and Improvements 13,328      
Total 14,907      
Accumulated Depreciation $ 10,044      
Depreciable Lives (Years) [5] (1)      
Kendall Center Blue Garage | Boston Properties Limited Partnership | Garage        
Original Cost        
Original Land $ 1,163      
Original Building 11,633      
Costs Capitalized Subsequent to Acquisition 446      
Land and Improvements 1,163      
Building and Improvements 12,079      
Total 13,242      
Accumulated Depreciation $ 9,576      
Depreciable Lives (Years) [6] (1)      
Reston Next | Development        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 354,174      
Land and Improvements 0      
Building and Improvements 0      
Development and Construction in Progress 354,174      
Total 354,174      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
Reston Next | Boston Properties Limited Partnership | Development        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 354,174      
Land and Improvements 0      
Building and Improvements 0      
Development and Construction in Progress 354,174      
Total 354,174      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
2100 Pennsylvania Avenue | Development        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 294,445      
Land and Improvements 185,129      
Building and Improvements 0      
Development and Construction in Progress 109,316      
Total 294,445      
Accumulated Depreciation $ 3,481      
Depreciable Lives (Years) N/A      
2100 Pennsylvania Avenue | Boston Properties Limited Partnership | Development        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 294,445      
Land and Improvements 185,129      
Building and Improvements 0      
Development and Construction in Progress 109,316      
Total 294,445      
Accumulated Depreciation $ 3,481      
Depreciable Lives (Years) N/A      
325 Main Street | Development        
Original Cost        
Original Land $ 174      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 161,468      
Land and Improvements 965      
Building and Improvements 0      
Development and Construction in Progress 160,677      
Total 161,642      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
325 Main Street | Boston Properties Limited Partnership | Development        
Original Cost        
Original Land $ 174      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 161,275      
Land and Improvements 772      
Building and Improvements 0      
Development and Construction in Progress 160,677      
Total 161,449      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
777 Harrison Street | Land        
Original Cost        
Original Land $ 144,647      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 25,930      
Land and Improvements 0      
Building and Improvements 47      
Land held for development 170,530      
Total 170,577      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
777 Harrison Street | Boston Properties Limited Partnership | Land        
Original Cost        
Original Land $ 144,647      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 25,930      
Land and Improvements 0      
Building and Improvements 47      
Land held for development 170,530      
Total 170,577      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
North First Master Plan | Land        
Original Cost        
Original Land $ 35,004      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 3,937      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 38,941      
Total 38,941      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
North First Master Plan | Boston Properties Limited Partnership | Land        
Original Cost        
Original Land $ 35,004      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 3,937      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 38,941      
Total 38,941      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
Plaza at Almaden | Land        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 36,431      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 36,431      
Total 36,431      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
Plaza at Almaden | Boston Properties Limited Partnership | Land        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 36,431      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 36,431      
Total 36,431      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
Back Bay Station Master Plan | Land        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 30,643      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 30,643      
Total 30,643      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
Back Bay Station Master Plan | Boston Properties Limited Partnership | Land        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 30,643      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 30,643      
Total 30,643      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
Reston Gateway Master Plan | Land        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 28,610      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 28,610      
Total 28,610      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
Reston Gateway Master Plan | Boston Properties Limited Partnership | Land        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 28,610      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 28,610      
Total 28,610      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
Springfield Metro Center | Land        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 19,871      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 19,871      
Total 19,871      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
Springfield Metro Center | Boston Properties Limited Partnership | Land        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 19,871      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 19,871      
Total 19,871      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
214 Third Avenue | Land        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 19,206      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 19,206      
Total 19,206      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
214 Third Avenue | Boston Properties Limited Partnership | Land        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 19,206      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 19,206      
Total 19,206      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
CityPoint South Master Plan | Land        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 13,363      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 13,363      
Total 13,363      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
CityPoint South Master Plan | Boston Properties Limited Partnership | Land        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 13,363      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 13,363      
Total 13,363      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
103 Fourth Avenue | Land        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 12,888      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 12,888      
Total 12,888      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
103 Fourth Avenue | Boston Properties Limited Partnership | Land        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 12,888      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 12,888      
Total 12,888      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
Broad Run Business Park | Land        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 2,392      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 2,392      
Total 2,392      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
Broad Run Business Park | Boston Properties Limited Partnership | Land        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 2,392      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 2,392      
Total 2,392      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
Kendall Center Master Plan | Land        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 2,145      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 2,145      
Total 2,145      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
Kendall Center Master Plan | Boston Properties Limited Partnership | Land        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 2,145      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 2,145      
Total 2,145      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
Weston Quarry | Land        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 1,249      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 1,249      
Total 1,249      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
Weston Quarry | Boston Properties Limited Partnership | Land        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 1,249      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 1,249      
Total 1,249      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
Reston Overlook Master Plan | Land        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 42      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 42      
Total 42      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
Reston Overlook Master Plan | Boston Properties Limited Partnership | Land        
Original Cost        
Original Land $ 0      
Original Building 0      
Costs Capitalized Subsequent to Acquisition 42      
Land and Improvements 0      
Building and Improvements 0      
Land held for development 42      
Total 42      
Accumulated Depreciation $ 0      
Depreciable Lives (Years) N/A      
[1] Includes pre-development costs.
[2] Includes unamortized deferred financing costs totaling approximately $(22.9) million.
[3] Includes Right of Use Assets - Finance Leases and Right of Use Assets - Operating Leases of approximately $214,091 and $148,640, respectively.
[4] Includes Right of Use Assets - Finance Leases of approximately $23,302.
[5] Depreciation of the buildings and improvements are calculated over lives ranging from the life of the lease to 40 years.
[6] Depreciation of the buildings and improvements are calculated over lives ranging from the life of the lease to 40 years.