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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.

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