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SEC Schedule, Article 12-28, Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
May 19, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]          
Encumbrances $ 3,267,914        
Original Cost          
Original Land 5,238,614        
Original Building 13,216,859        
Costs Capitalized Subsequent to Acquisition 5,652,747        
Land and Improvements 5,445,112        
Building and Improvements 17,208,581        
Land held for development [1] 560,355   $ 450,954    
Development and Construction in Progress 894,172   868,773    
Total 24,108,220   23,303,303 $ 22,844,697 $ 21,605,545
Accumulated Depreciation 5,848,183   5,501,637 5,239,179 4,871,102
Furniture, Fixtures and Equipment 51,695   49,606    
Aggregate cost for tax purpose 21,800,000        
Real Estate Aggregate Accumulated Depreciation For Tax Purposes 4,900,000        
Debt Issuance Costs, Net (32,086)        
Right-of-use assets - finance leases 237,507   237,393    
Right of use assets - operating leases $ 169,778 [2]   146,406    
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 $ 35,778        
Land and Land Improvements [Member]          
Original Cost          
Right-of-use assets - finance leases 214,165        
Right of use assets - operating leases 169,778        
Buildings and improvements          
Original Cost          
Right-of-use assets - finance leases 23,342        
Boston Properties Limited Partnership          
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]          
Encumbrances [3] 3,267,914        
Original Cost          
Original Land 5,238,614        
Original Building 13,216,859        
Costs Capitalized Subsequent to Acquisition 5,279,360        
Land and Improvements [4] 5,348,929        
Building and Improvements [5] 16,931,377        
Land held for development [1] 560,355   450,954    
Development and Construction in Progress 894,172   868,773    
Total 23,734,833   22,926,494 22,449,476 21,207,189
Accumulated Depreciation 5,736,240   5,396,111 $ 5,135,289 $ 4,773,800
Furniture, Fixtures and Equipment 51,695   49,606    
Aggregate cost for tax purpose 24,200,000        
Real Estate Aggregate Accumulated Depreciation For Tax Purposes 5,400,000        
Debt Issuance Costs, Net (32,100)        
Right-of-use assets - finance leases 237,507   237,393    
Right of use assets - operating leases $ 169,778 [2]   $ 146,406    
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 $ 35,778        
Boston Properties Limited Partnership | Land and Land Improvements [Member]          
Original Cost          
Right-of-use assets - finance leases 214,165        
Right of use assets - operating leases 169,778        
Boston Properties Limited Partnership | Buildings and improvements          
Original Cost          
Right-of-use assets - finance leases 23,342        
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 2,281,016        
Original Cost          
Original Land 1,796,252        
Original Building 1,532,654        
Costs Capitalized Subsequent to Acquisition 260,700        
Land and Improvements 1,796,252        
Building and Improvements 1,793,354        
Total 3,589,606        
Accumulated Depreciation $ 407,377        
Depreciable Lives (Years) [6] (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 $ 2,281,016        
Original Cost          
Original Land 1,796,252        
Original Building 1,532,654        
Costs Capitalized Subsequent to Acquisition 260,700        
Land and Improvements 1,796,252        
Building and Improvements 1,793,354        
Total 3,589,606        
Accumulated Depreciation $ 407,377        
Depreciable Lives (Years) [7] (1)        
Prudential Center | Office Building [Member]          
Original Cost          
Original Land $ 92,077        
Original Building 948,357        
Costs Capitalized Subsequent to Acquisition 615,973        
Land and Improvements 115,637        
Building and Improvements 1,483,065        
Land held for development 192        
Development and Construction in Progress 57,513        
Total 1,656,407        
Accumulated Depreciation $ 678,000        
Depreciable Lives (Years) [6] (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 556,917        
Land and Improvements 100,539        
Building and Improvements 1,439,107        
Land held for development 192        
Development and Construction in Progress 57,513        
Total 1,597,351        
Accumulated Depreciation $ 660,321        
Depreciable Lives (Years) [7] (1)        
Embarcadero Center | Office Building [Member]          
Original Cost          
Original Land $ 179,697        
Original Building 847,410        
Costs Capitalized Subsequent to Acquisition 480,465        
Land and Improvements 195,987        
Building and Improvements 1,311,585        
Total 1,507,572        
Accumulated Depreciation $ 692,283        
Depreciable Lives (Years) [6] (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 418,084        
Land and Improvements 180,420        
Building and Improvements 1,264,771        
Total 1,445,191        
Accumulated Depreciation $ 673,363        
Depreciable Lives (Years) [7] (1)        
399 Park Avenue | Office Building [Member]          
Original Cost          
Original Land $ 339,200        
Original Building 700,358        
Costs Capitalized Subsequent to Acquisition 366,449        
Land and Improvements 354,107        
Building and Improvements 1,051,900        
Total 1,406,007        
Accumulated Depreciation $ 405,104        
Depreciable Lives (Years) [6] (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 306,841        
Land and Improvements 339,200        
Building and Improvements 1,007,199        
Total 1,346,399        
Accumulated Depreciation $ 387,131        
Depreciable Lives (Years) [7] (1)        
601 Lexington Avenue | Office Building [Member]          
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]          
Encumbrances $ 986,898        
Original Cost          
Original Land 241,600        
Original Building 494,782        
Costs Capitalized Subsequent to Acquisition 486,028        
Land and Improvements 289,639        
Building and Improvements 932,771        
Total 1,222,410        
Accumulated Depreciation $ 325,012        
Depreciable Lives (Years) [6] (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 $ 986,898        
Original Cost          
Original Land 241,600        
Original Building 494,782        
Costs Capitalized Subsequent to Acquisition 448,942        
Land and Improvements 279,281        
Building and Improvements 906,043        
Total 1,185,324        
Accumulated Depreciation $ 314,209        
Depreciable Lives (Years) [7] (1)        
Salesforce Tower | Office Building [Member]          
Original Cost          
Original Land $ 200,349        
Original Building 946,205        
Costs Capitalized Subsequent to Acquisition 7,515        
Land and Improvements 200,349        
Building and Improvements 953,720        
Total 1,154,069        
Accumulated Depreciation $ 99,152        
Depreciable Lives (Years) [6] (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 7,515        
Land and Improvements 200,349        
Building and Improvements 953,720        
Total 1,154,069        
Accumulated Depreciation $ 99,152        
Depreciable Lives (Years) [7] (1)        
200 Clarendon Street and Garage | Office Building [Member]          
Original Cost          
Original Land $ 219,543        
Original Building 667,884        
Costs Capitalized Subsequent to Acquisition 222,640        
Land and Improvements 250,560        
Building and Improvements 859,507        
Total 1,110,067        
Accumulated Depreciation $ 277,388        
Depreciable Lives (Years) [6] (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 222,640        
Land and Improvements 250,560        
Building and Improvements 859,507        
Total 1,110,067        
Accumulated Depreciation $ 277,388        
Depreciable Lives (Years) [7] (1)        
250 West 55th Street | Office Building [Member]          
Original Cost          
Original Land $ 285,263        
Original Building 603,167        
Costs Capitalized Subsequent to Acquisition 52,298        
Land and Improvements 285,263        
Building and Improvements 655,465        
Total 940,728        
Accumulated Depreciation $ 159,238        
Depreciable Lives (Years) [6] (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 52,298        
Land and Improvements 285,263        
Building and Improvements 655,465        
Total 940,728        
Accumulated Depreciation $ 159,238        
Depreciable Lives (Years) [7] (1)        
100 Federal Street | Office Building [Member]          
Original Cost          
Original Land $ 131,067        
Original Building 435,954        
Costs Capitalized Subsequent to Acquisition 138,727        
Land and Improvements 131,067        
Building and Improvements 574,681        
Total 705,748        
Accumulated Depreciation $ 157,939        
Depreciable Lives (Years) [6] (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 138,727        
Land and Improvements 131,067        
Building and Improvements 574,681        
Total 705,748        
Accumulated Depreciation $ 157,939        
Depreciable Lives (Years) [7] (1)        
Times Square Tower | Office Building [Member]          
Original Cost          
Original Land $ 165,413        
Original Building 380,438        
Costs Capitalized Subsequent to Acquisition 115,843        
Land and Improvements 169,193        
Building and Improvements 492,501        
Total 661,694        
Accumulated Depreciation $ 232,128        
Depreciable Lives (Years) [6] (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 77,864        
Land and Improvements 159,694        
Building and Improvements 464,021        
Total 623,715        
Accumulated Depreciation $ 220,676        
Depreciable Lives (Years) [7] (1)        
Carnegie Center | Office Building [Member]          
Original Cost          
Original Land $ 142,666        
Original Building 316,856        
Costs Capitalized Subsequent to Acquisition 159,350        
Land and Improvements 94,240        
Building and Improvements 469,216        
Land held for development 55,416        
Total 618,872        
Accumulated Depreciation $ 236,695        
Depreciable Lives (Years) [6] (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 144,387        
Land and Improvements 90,498        
Building and Improvements 457,995        
Land held for development 55,416        
Total 603,909        
Accumulated Depreciation $ 232,183        
Depreciable Lives (Years) [7] (1)        
Atlantic Wharf | Office Building [Member]          
Original Cost          
Original Land $ 63,988        
Original Building 454,537        
Costs Capitalized Subsequent to Acquisition 19,831        
Land and Improvements 63,988        
Building and Improvements 474,368        
Total 538,356        
Accumulated Depreciation $ 156,879        
Depreciable Lives (Years) [6] (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 19,831        
Land and Improvements 63,988        
Building and Improvements 474,368        
Total 538,356        
Accumulated Depreciation $ 156,879        
Depreciable Lives (Years) [7] (1)        
599 Lexington Avenue | Office Building [Member]          
Original Cost          
Original Land $ 81,040        
Original Building 100,507        
Costs Capitalized Subsequent to Acquisition 247,001        
Land and Improvements 87,852        
Building and Improvements 340,696        
Total 428,548        
Accumulated Depreciation $ 179,928        
Depreciable Lives (Years) [6] (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 219,759        
Land and Improvements 81,040        
Building and Improvements 320,266        
Total 401,306        
Accumulated Depreciation $ 171,713        
Depreciable Lives (Years) [7] (1)        
Fountain Square | Office Building [Member]          
Original Cost          
Original Land $ 56,853        
Original Building 306,298        
Costs Capitalized Subsequent to Acquisition 29,595        
Land and Improvements 56,853        
Building and Improvements 335,893        
Total 392,746        
Accumulated Depreciation $ 94,501        
Depreciable Lives (Years) [6] (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 29,595        
Land and Improvements 56,853        
Building and Improvements 335,893        
Total 392,746        
Accumulated Depreciation $ 94,501        
Depreciable Lives (Years) [7] (1)        
510 Madison Avenue | Office Building [Member]          
Original Cost          
Original Land $ 103,000        
Original Building 253,665        
Costs Capitalized Subsequent to Acquisition 28,825        
Land and Improvements 103,000        
Building and Improvements 282,490        
Total 385,490        
Accumulated Depreciation $ 90,673        
Depreciable Lives (Years) [6] (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 28,825        
Land and Improvements 103,000        
Building and Improvements 282,490        
Total 385,490        
Accumulated Depreciation $ 90,673        
Depreciable Lives (Years) [7] (1)        
680 Folsom Street | Office Building [Member]          
Original Cost          
Original Land $ 72,545        
Original Building 219,766        
Costs Capitalized Subsequent to Acquisition 8,026        
Land and Improvements 72,545        
Building and Improvements 227,792        
Total 300,337        
Accumulated Depreciation $ 63,864        
Depreciable Lives (Years) [6] (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 8,026        
Land and Improvements 72,545        
Building and Improvements 227,792        
Total 300,337        
Accumulated Depreciation $ 63,864        
Depreciable Lives (Years) [7] (1)        
145 Broadway | Office Building [Member]          
Original Cost          
Original Land $ 121        
Original Building 273,013        
Costs Capitalized Subsequent to Acquisition 25,992        
Land and Improvements 23,367        
Building and Improvements 275,759        
Total 299,126        
Accumulated Depreciation $ 18,393        
Depreciable Lives (Years) [6] (1)        
145 Broadway | Boston Properties Limited Partnership | Office Building [Member]          
Original Cost          
Original Land $ 121        
Original Building 273,013        
Costs Capitalized Subsequent to Acquisition 25,789        
Land and Improvements 23,164        
Building and Improvements 275,759        
Total 298,923        
Accumulated Depreciation $ 18,393        
Depreciable Lives (Years) [7] (1)        
2200 Pennsylvania Avenue | Office Building [Member]          
Original Cost          
Original Land $ 0        
Original Building 183,541        
Costs Capitalized Subsequent to Acquisition 110,980        
Land and Improvements 105,787        
Building and Improvements 188,734        
Total 294,521        
Accumulated Depreciation $ 71,983        
Depreciable Lives (Years) [6] (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 110,980        
Land and Improvements 105,787        
Building and Improvements 188,734        
Total 294,521        
Accumulated Depreciation $ 71,983        
Depreciable Lives (Years) [7] (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 21,882        
Land and Improvements 13,687        
Building and Improvements 259,277        
Total 272,964        
Accumulated Depreciation $ 94,354        
Depreciable Lives (Years) [6] (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 21,546        
Land and Improvements 13,603        
Building and Improvements 259,025        
Total 272,628        
Accumulated Depreciation $ 94,269        
Depreciable Lives (Years) [7] (1)        
601 Massachusetts Avenue | Office Building [Member]          
Original Cost          
Original Land $ 95,310        
Original Building 165,173        
Costs Capitalized Subsequent to Acquisition 3,965        
Land and Improvements 95,322        
Building and Improvements 169,126        
Total 264,448        
Accumulated Depreciation $ 36,983        
Depreciable Lives (Years) [6] (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 3,953        
Land and Improvements 95,310        
Building and Improvements 169,126        
Total 264,436        
Accumulated Depreciation $ 36,983        
Depreciable Lives (Years) [7] (1)        
Bay Colony Corporate Center | Office Building [Member]          
Original Cost          
Original Land $ 18,789        
Original Building 148,451        
Costs Capitalized Subsequent to Acquisition 80,753        
Land and Improvements 18,789        
Building and Improvements 229,144        
Land held for development 60        
Total 247,993        
Accumulated Depreciation $ 97,149        
Depreciable Lives (Years) [6] (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 80,753        
Land and Improvements 18,789        
Building and Improvements 229,144        
Land held for development 60        
Total 247,993        
Accumulated Depreciation $ 97,149        
Depreciable Lives (Years) [7] (1)        
535 Mission Street | Office Building [Member]          
Original Cost          
Original Land $ 40,933        
Original Building 148,378        
Costs Capitalized Subsequent to Acquisition 3,501        
Land and Improvements 40,933        
Building and Improvements 151,879        
Total 192,812        
Accumulated Depreciation $ 37,477        
Depreciable Lives (Years) [6] (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 3,501        
Land and Improvements 40,933        
Building and Improvements 151,879        
Total 192,812        
Accumulated Depreciation $ 37,477        
Depreciable Lives (Years) [7] (1)        
Mountain View Research Park | Office Building [Member]          
Original Cost          
Original Land $ 95,066        
Original Building 68,373        
Costs Capitalized Subsequent to Acquisition 16,801        
Land and Improvements 95,066        
Building and Improvements 85,174        
Total 180,240        
Accumulated Depreciation $ 24,149        
Depreciable Lives (Years) [6] (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 16,801        
Land and Improvements 95,066        
Building and Improvements 85,174        
Total 180,240        
Accumulated Depreciation $ 24,149        
Depreciable Lives (Years) [7] (1)        
Reservoir Place | Office Building [Member]          
Original Cost          
Original Land $ 18,605        
Original Building 104,124        
Costs Capitalized Subsequent to Acquisition 53,945        
Land and Improvements 20,108        
Building and Improvements 156,275        
Land held for development 291        
Total 176,674        
Accumulated Depreciation $ 79,338        
Depreciable Lives (Years) [6] (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 49,870        
Land and Improvements 19,089        
Building and Improvements 153,219        
Land held for development 291        
Total 172,599        
Accumulated Depreciation $ 78,109        
Depreciable Lives (Years) [7] (1)        
1330 Connecticut Avenue | Office Building [Member]          
Original Cost          
Original Land $ 25,982        
Original Building 82,311        
Costs Capitalized Subsequent to Acquisition 37,161        
Land and Improvements 27,135        
Building and Improvements 118,319        
Total 145,454        
Accumulated Depreciation $ 43,174        
Depreciable Lives (Years) [6] (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 32,548        
Land and Improvements 25,982        
Building and Improvements 114,859        
Total 140,841        
Accumulated Depreciation $ 41,783        
Depreciable Lives (Years) [7] (1)        
One Freedom Square | Office Building [Member]          
Original Cost          
Original Land $ 9,929        
Original Building 84,504        
Costs Capitalized Subsequent to Acquisition 41,978        
Land and Improvements 11,293        
Building and Improvements 125,118        
Total 136,411        
Accumulated Depreciation $ 60,550        
Depreciable Lives (Years) [6] (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 36,341        
Land and Improvements 9,883        
Building and Improvements 120,891        
Total 130,774        
Accumulated Depreciation $ 58,850        
Depreciable Lives (Years) [7] (1)        
Kingstowne Towne Center | Office Building [Member]          
Original Cost          
Original Land $ 18,021        
Original Building 109,038        
Costs Capitalized Subsequent to Acquisition 3,875        
Land and Improvements 18,062        
Building and Improvements 112,872        
Total 130,934        
Accumulated Depreciation $ 49,475        
Depreciable Lives (Years) [6] (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 3,711        
Land and Improvements 18,021        
Building and Improvements 112,749        
Total 130,770        
Accumulated Depreciation $ 49,433        
Depreciable Lives (Years) [7] (1)        
One and Two Reston Overlook | Office Building [Member]          
Original Cost          
Original Land $ 16,456        
Original Building 66,192        
Costs Capitalized Subsequent to Acquisition 40,694        
Land and Improvements 16,179        
Building and Improvements 107,163        
Total 123,342        
Accumulated Depreciation $ 55,487        
Depreciable Lives (Years) [6] (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 36,276        
Land and Improvements 15,074        
Building and Improvements 103,850        
Total 118,924        
Accumulated Depreciation $ 54,155        
Depreciable Lives (Years) [7] (1)        
140 Kendrick Street | Office Building [Member]          
Original Cost          
Original Land $ 18,095        
Original Building 66,905        
Costs Capitalized Subsequent to Acquisition 37,813        
Land and Improvements 19,092        
Building and Improvements 103,721        
Total 122,813        
Accumulated Depreciation $ 40,242        
Depreciable Lives (Years) [6] (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 33,823        
Land and Improvements 18,095        
Building and Improvements 100,728        
Total 118,823        
Accumulated Depreciation $ 39,039        
Depreciable Lives (Years) [7] (1)        
Shady Grove Innovation District [Member] | Office Building [Member]          
Original Cost          
Original Land $ 52,030        
Original Building 64,212        
Costs Capitalized Subsequent to Acquisition 2,676        
Land and Improvements 26,834        
Building and Improvements 34,974        
Land held for development 57,110        
Total 118,918        
Accumulated Depreciation $ 1,048        
Depreciable Lives (Years) [6] (1)        
Shady Grove Innovation District [Member] | Boston Properties Limited Partnership | Office Building [Member]          
Original Cost          
Original Land $ 52,030        
Original Building 64,212        
Costs Capitalized Subsequent to Acquisition 2,676        
Land and Improvements 26,834        
Building and Improvements 34,974        
Land held for development 57,110        
Total 118,918        
Accumulated Depreciation $ 1,048        
Depreciable Lives (Years) [7] (1)        
Weston Corporate Center | Office Building [Member]          
Original Cost          
Original Land $ 25,753        
Original Building 92,312        
Costs Capitalized Subsequent to Acquisition 32        
Land and Improvements 25,854        
Building and Improvements 92,243        
Total 118,097        
Accumulated Depreciation $ 35,329        
Depreciable Lives (Years) [6] (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 32        
Land and Improvements 25,854        
Building and Improvements 92,243        
Total 118,097        
Accumulated Depreciation $ 35,329        
Depreciable Lives (Years) [7] (1)        
17Fifty Presidents Street | Office Building [Member]          
Original Cost          
Original Land $ 0        
Original Building 113,362        
Costs Capitalized Subsequent to Acquisition 44        
Land and Improvements 0        
Building and Improvements 113,406        
Total 113,406        
Accumulated Depreciation $ 7,840        
Depreciable Lives (Years) [6] (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 44        
Land and Improvements 0        
Building and Improvements 113,406        
Total 113,406        
Accumulated Depreciation $ 7,840        
Depreciable Lives (Years) [7] (1)        
Discovery Square | Office Building [Member]          
Original Cost          
Original Land $ 11,198        
Original Building 71,782        
Costs Capitalized Subsequent to Acquisition 21,304        
Land and Improvements 12,533        
Building and Improvements 91,751        
Total 104,284        
Accumulated Depreciation $ 50,358        
Depreciable Lives (Years) [6] (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 15,759        
Land and Improvements 11,146        
Building and Improvements 87,593        
Total 98,739        
Accumulated Depreciation $ 48,686        
Depreciable Lives (Years) [7] (1)        
355 Main Street | Office Building [Member]          
Original Cost          
Original Land $ 18,863        
Original Building 53,346        
Costs Capitalized Subsequent to Acquisition 24,995        
Land and Improvements 21,173        
Building and Improvements 76,031        
Total 97,204        
Accumulated Depreciation $ 31,827        
Depreciable Lives (Years) [6] (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 24,697        
Land and Improvements 21,098        
Building and Improvements 75,808        
Total 96,906        
Accumulated Depreciation $ 31,739        
Depreciable Lives (Years) [7] (1)        
10 CityPoint | Office Building [Member]          
Original Cost          
Original Land $ 1,953        
Original Building 85,752        
Costs Capitalized Subsequent to Acquisition 6,963        
Land and Improvements 2,290        
Building and Improvements 92,378        
Total 94,668        
Accumulated Depreciation $ 17,327        
Depreciable Lives (Years) [6] (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 6,800        
Land and Improvements 2,127        
Building and Improvements 92,378        
Total 94,505        
Accumulated Depreciation $ 17,327        
Depreciable Lives (Years) [7] (1)        
Two Freedom Square | Office Building [Member]          
Original Cost          
Original Land $ 13,930        
Original Building 77,739        
Costs Capitalized Subsequent to Acquisition (184)        
Land and Improvements 15,420        
Building and Improvements 76,065        
Total 91,485        
Accumulated Depreciation $ 33,696        
Depreciable Lives (Years) [6] (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 (6,396)        
Land and Improvements 13,866        
Building and Improvements 71,407        
Total 85,273        
Accumulated Depreciation $ 31,823        
Depreciable Lives (Years) [7] (1)        
90 Broadway | Office Building [Member]          
Original Cost          
Original Land $ 19,104        
Original Building 52,078        
Costs Capitalized Subsequent to Acquisition 18,876        
Land and Improvements 20,785        
Building and Improvements 69,273        
Total 90,058        
Accumulated Depreciation $ 26,797        
Depreciable Lives (Years) [6] (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 18,697        
Land and Improvements 20,741        
Building and Improvements 69,138        
Total 89,879        
Accumulated Depreciation $ 26,749        
Depreciable Lives (Years) [7] (1)        
153 & 211 Second Avenue [Member] | Office Building [Member]          
Original Cost          
Original Land $ 33,233        
Original Building 55,940        
Costs Capitalized Subsequent to Acquisition 0        
Land and Improvements 33,233        
Building and Improvements 55,940        
Total 89,173        
Accumulated Depreciation $ 1,819        
Depreciable Lives (Years) [6] (1)        
153 & 211 Second Avenue [Member] | Boston Properties Limited Partnership | Office Building [Member]          
Original Cost          
Original Land $ 33,233        
Original Building 55,940        
Costs Capitalized Subsequent to Acquisition 0        
Land and Improvements 33,233        
Building and Improvements 55,940        
Total 89,173        
Accumulated Depreciation $ 1,819        
Depreciable Lives (Years) [7] (1)        
230 CityPoint | Office Building [Member]          
Original Cost          
Original Land $ 13,189        
Original Building 49,823        
Costs Capitalized Subsequent to Acquisition 23,874        
Land and Improvements 13,807        
Building and Improvements 73,079        
Total 86,886        
Accumulated Depreciation $ 35,469        
Depreciable Lives (Years) [6] (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 22,257        
Land and Improvements 13,403        
Building and Improvements 71,866        
Total 85,269        
Accumulated Depreciation $ 34,984        
Depreciable Lives (Years) [7] (1)        
77 CityPoint | Office Building [Member]          
Original Cost          
Original Land $ 13,847        
Original Building 60,383        
Costs Capitalized Subsequent to Acquisition 11,524        
Land and Improvements 14,023        
Building and Improvements 71,731        
Total 85,754        
Accumulated Depreciation $ 31,832        
Depreciable Lives (Years) [6] (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 11,419        
Land and Improvements 13,997        
Building and Improvements 71,652        
Total 85,649        
Accumulated Depreciation $ 31,804        
Depreciable Lives (Years) [7] (1)        
20 Citypoint | Office Building [Member]          
Original Cost          
Original Land $ 4,887        
Original Building 72,764        
Costs Capitalized Subsequent to Acquisition 7,071        
Land and Improvements 4,887        
Building and Improvements 79,835        
Total 84,722        
Accumulated Depreciation $ 6,135        
Depreciable Lives (Years) [6] (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 7,071        
Land and Improvements 4,887        
Building and Improvements 79,835        
Total 84,722        
Accumulated Depreciation $ 6,135        
Depreciable Lives (Years) [7] (1)        
Waltham Weston Corporate Center | Office Building [Member]          
Original Cost          
Original Land $ 10,385        
Original Building 60,694        
Costs Capitalized Subsequent to Acquisition 12,662        
Land and Improvements 11,097        
Building and Improvements 72,644        
Total 83,741        
Accumulated Depreciation $ 40,253        
Depreciable Lives (Years) [6] (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 9,675        
Land and Improvements 10,350        
Building and Improvements 70,404        
Total 80,754        
Accumulated Depreciation $ 39,353        
Depreciable Lives (Years) [7] (1)        
200 West Street | Office Building [Member]          
Original Cost          
Original Land $ 16,148        
Original Building 24,983        
Costs Capitalized Subsequent to Acquisition 39,592        
Land and Improvements 16,813        
Building and Improvements 63,593        
Land held for development 317        
Total 80,723        
Accumulated Depreciation $ 19,724        
Depreciable Lives (Years) [6] (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 36,931        
Land and Improvements 16,148        
Building and Improvements 61,597        
Land held for development 317        
Total 78,062        
Accumulated Depreciation $ 18,922        
Depreciable Lives (Years) [7] (1)        
Sumner Square          
Original Cost          
Right of use assets - operating leases   $ 27,100      
Sumner Square | Office Building [Member]          
Original Cost          
Original Land $ 624        
Original Building 28,745        
Costs Capitalized Subsequent to Acquisition 49,345        
Land and Improvements 28,548        
Building and Improvements 50,166        
Total 78,714        
Accumulated Depreciation $ 29,871        
Depreciable Lives (Years) [6] (1)        
Sumner Square | Boston Properties Limited Partnership | Office Building [Member]          
Original Cost          
Original Land $ 624        
Original Building 28,745        
Costs Capitalized Subsequent to Acquisition 47,265        
Land and Improvements 28,028        
Building and Improvements 48,606        
Total 76,634        
Accumulated Depreciation $ 29,247        
Depreciable Lives (Years) [7] (1)        
2440 West El Camino Real | Office Building [Member]          
Original Cost          
Original Land $ 16,741        
Original Building 51,285        
Costs Capitalized Subsequent to Acquisition 6,290        
Land and Improvements 16,741        
Building and Improvements 57,575        
Total 74,316        
Accumulated Depreciation $ 17,265        
Depreciable Lives (Years) [6] (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 6,290        
Land and Improvements 16,741        
Building and Improvements 57,575        
Total 74,316        
Accumulated Depreciation $ 17,265        
Depreciable Lives (Years) [7] (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 $ 14,537        
Depreciable Lives (Years) [6] (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 $ 14,537        
Depreciable Lives (Years) [7] (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 $ 32,950        
Depreciable Lives (Years) [6] (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 $ 32,162        
Depreciable Lives (Years) [7] (1)        
Wisconsin Place | Office Building [Member]          
Original Cost          
Original Land $ 0        
Original Building 53,349        
Costs Capitalized Subsequent to Acquisition 12,600        
Land and Improvements 0        
Building and Improvements 65,949        
Total 65,949        
Accumulated Depreciation $ 28,025        
Depreciable Lives (Years) [6] (1)        
Wisconsin Place | Boston Properties Limited Partnership | Office Building [Member]          
Original Cost          
Original Land $ 0        
Original Building 53,349        
Costs Capitalized Subsequent to Acquisition 12,600        
Land and Improvements 0        
Building and Improvements 65,949        
Total 65,949        
Accumulated Depreciation $ 28,025        
Depreciable Lives (Years) [7] (1)        
255 Main Street | Office Building [Member]          
Original Cost          
Original Land $ 134        
Original Building 25,110        
Costs Capitalized Subsequent to Acquisition 34,260        
Land and Improvements 548        
Building and Improvements 58,956        
Total 59,504        
Accumulated Depreciation $ 39,791        
Depreciable Lives (Years) [6] (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 32,604        
Land and Improvements 134        
Building and Improvements 57,714        
Total 57,848        
Accumulated Depreciation $ 39,294        
Depreciable Lives (Years) [7] (1)        
University Place | Office Building [Member]          
Original Cost          
Original Land $ 0        
Original Building 37,091        
Costs Capitalized Subsequent to Acquisition 16,512        
Land and Improvements 6,004        
Building and Improvements 47,599        
Total 53,603        
Accumulated Depreciation $ 33,469        
Depreciable Lives (Years) [6] (1)        
University Place | Boston Properties Limited Partnership | Office Building [Member]          
Original Cost          
Original Land $ 0        
Original Building 37,091        
Costs Capitalized Subsequent to Acquisition 15,062        
Land and Improvements 6,004        
Building and Improvements 46,149        
Total 52,153        
Accumulated Depreciation $ 32,504        
Depreciable Lives (Years) [7] (1)        
890 Winter Street | Office Building [Member]          
Original Cost          
Original Land $ 13,913        
Original Building 28,557        
Costs Capitalized Subsequent to Acquisition 4,745        
Land and Improvements 13,913        
Building and Improvements 33,302        
Total 47,215        
Accumulated Depreciation $ 3,928        
Depreciable Lives (Years) [6] (1)        
890 Winter Street | Boston Properties Limited Partnership | Office Building [Member]          
Original Cost          
Original Land $ 13,913        
Original Building 28,557        
Costs Capitalized Subsequent to Acquisition 4,745        
Land and Improvements 13,913        
Building and Improvements 33,302        
Total 47,215        
Accumulated Depreciation $ 3,928        
Depreciable Lives (Years) [7] (1)        
Capital Gallery | Office Building [Member]          
Original Cost          
Original Land $ 4,725        
Original Building 29,565        
Costs Capitalized Subsequent to Acquisition 9,681        
Land and Improvements 8,662        
Building and Improvements 35,309        
Total 43,971        
Accumulated Depreciation $ 21,562        
Depreciable Lives (Years) [6] (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 5,018        
Land and Improvements 6,128        
Building and Improvements 33,180        
Total 39,308        
Accumulated Depreciation $ 20,706        
Depreciable Lives (Years) [7] (1)        
North First Business Park | Office Building [Member]          
Original Cost          
Original Land $ 23,398        
Original Building 13,069        
Costs Capitalized Subsequent to Acquisition 4,545        
Land and Improvements 23,377        
Building and Improvements 17,635        
Total 41,012        
Accumulated Depreciation $ 17,017        
Depreciable Lives (Years) [6] (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 4,522        
Land and Improvements 23,371        
Building and Improvements 17,618        
Total 40,989        
Accumulated Depreciation $ 17,011        
Depreciable Lives (Years) [7] (1)        
150 Broadway | Office Building [Member]          
Original Cost          
Original Land $ 850        
Original Building 25,042        
Costs Capitalized Subsequent to Acquisition 2,350        
Land and Improvements 1,323        
Building and Improvements 26,919        
Total 28,242        
Accumulated Depreciation $ 14,833        
Depreciable Lives (Years) [6] (1)        
150 Broadway | Boston Properties Limited Partnership | Office Building [Member]          
Original Cost          
Original Land $ 850        
Original Building 25,042        
Costs Capitalized Subsequent to Acquisition 345        
Land and Improvements 822        
Building and Improvements 25,415        
Total 26,237        
Accumulated Depreciation $ 14,225        
Depreciable Lives (Years) [7] (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 $ 14,309        
Depreciable Lives (Years) [6] (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 $ 13,674        
Depreciable Lives (Years) [7] (1)        
Lexington Office Park | Office Building [Member]          
Original Cost          
Original Land $ 998        
Original Building 1,426        
Costs Capitalized Subsequent to Acquisition 18,582        
Land and Improvements 1,264        
Building and Improvements 19,551        
Land held for development 191        
Total 21,006        
Accumulated Depreciation $ 16,012        
Depreciable Lives (Years) [6] (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 17,818        
Land and Improvements 1,073        
Building and Improvements 18,978        
Land held for development 191        
Total 20,242        
Accumulated Depreciation $ 15,785        
Depreciable Lives (Years) [7] (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 $ 1,984        
Depreciable Lives (Years) [6] (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 $ 1,984        
Depreciable Lives (Years) [7] (1)        
690 Folsom Street | Office Building [Member]          
Original Cost          
Original Land $ 3,219        
Original Building 11,038        
Costs Capitalized Subsequent to Acquisition 1,877        
Land and Improvements 3,219        
Building and Improvements 12,915        
Total 16,134        
Accumulated Depreciation $ 3,354        
Depreciable Lives (Years) [6] (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 1,877        
Land and Improvements 3,219        
Building and Improvements 12,915        
Total 16,134        
Accumulated Depreciation $ 3,354        
Depreciable Lives (Years) [7] (1)        
195 West Street | Office Building [Member]          
Original Cost          
Original Land $ 1,611        
Original Building 6,652        
Costs Capitalized Subsequent to Acquisition 7,470        
Land and Improvements 1,858        
Building and Improvements 13,875        
Total 15,733        
Accumulated Depreciation $ 8,842        
Depreciable Lives (Years) [6] (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 6,481        
Land and Improvements 1,611        
Building and Improvements 13,133        
Total 14,744        
Accumulated Depreciation $ 8,540        
Depreciable Lives (Years) [7] (1)        
33 Hayden Avenue | Office Building [Member]          
Original Cost          
Original Land $ 266        
Original Building 3,234        
Costs Capitalized Subsequent to Acquisition 11,501        
Land and Improvements 425        
Building and Improvements 14,576        
Total 15,001        
Accumulated Depreciation $ 6,768        
Depreciable Lives (Years) [6] (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 10,864        
Land and Improvements 266        
Building and Improvements 14,098        
Total 14,364        
Accumulated Depreciation $ 6,576        
Depreciable Lives (Years) [7] (1)        
92-100 Hayden Avenue | Office Building [Member]          
Original Cost          
Original Land $ 594        
Original Building 6,748        
Costs Capitalized Subsequent to Acquisition 6,259        
Land and Improvements 802        
Building and Improvements 12,799        
Total 13,601        
Accumulated Depreciation $ 11,468        
Depreciable Lives (Years) [6] (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 5,530        
Land and Improvements 619        
Building and Improvements 12,253        
Total 12,872        
Accumulated Depreciation $ 11,247        
Depreciable Lives (Years) [7] (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 $ 5,937        
Depreciable Lives (Years) [6] (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 $ 5,783        
Depreciable Lives (Years) [7] (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 $ 7,010        
Depreciable Lives (Years) [6] (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 $ 6,802        
Depreciable Lives (Years) [7] (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 $ 2,734        
Depreciable Lives (Years) [6] (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 $ 2,557        
Depreciable Lives (Years) [7] (1)        
7450 Boston Boulevard, Building Three | Office Building [Member]          
Original Cost          
Original Land $ 1,165        
Original Building 4,681        
Costs Capitalized Subsequent to Acquisition 2,613        
Land and Improvements 1,430        
Building and Improvements 7,029        
Total 8,459        
Accumulated Depreciation $ 4,774        
Depreciable Lives (Years) [6] (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 2,199        
Land and Improvements 1,327        
Building and Improvements 6,718        
Total 8,045        
Accumulated Depreciation $ 4,646        
Depreciable Lives (Years) [7] (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 $ 6,593        
Depreciable Lives (Years) [6] (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 $ 6,399        
Depreciable Lives (Years) [7] (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 $ 6,093        
Depreciable Lives (Years) [6] (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 $ 5,916        
Depreciable Lives (Years) [7] (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 $ 924        
Depreciable Lives (Years) [6] (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 $ 924        
Depreciable Lives (Years) [7] (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 $ 2,527        
Depreciable Lives (Years) [6] (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 $ 2,463        
Depreciable Lives (Years) [7] (1)        
17 Hartwell Avenue | Office Building [Member]          
Original Cost          
Original Land $ 26        
Original Building 150        
Costs Capitalized Subsequent to Acquisition 6,078        
Land and Improvements 65        
Building and Improvements 6,189        
Total 6,254        
Accumulated Depreciation $ 3,009        
Depreciable Lives (Years) [6] (1)        
17 Hartwell Avenue | Boston Properties Limited Partnership | Office Building [Member]          
Original Cost          
Original Land $ 26        
Original Building 150        
Costs Capitalized Subsequent to Acquisition 5,921        
Land and Improvements 26        
Building and Improvements 6,071        
Total 6,097        
Accumulated Depreciation $ 2,961        
Depreciable Lives (Years) [7] (1)        
7601 Boston Boulevard Building Eight | Office Building [Member]          
Original Cost          
Original Land $ 200        
Original Building 878        
Costs Capitalized Subsequent to Acquisition 5,045        
Land and Improvements 551        
Building and Improvements 5,572        
Total 6,123        
Accumulated Depreciation $ 4,986        
Depreciable Lives (Years) [6] (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 4,352        
Land and Improvements 378        
Building and Improvements 5,052        
Total 5,430        
Accumulated Depreciation $ 4,778        
Depreciable Lives (Years) [7] (1)        
7500 Boston Boulevard Building Six | Office Building [Member]          
Original Cost          
Original Land $ 138        
Original Building 3,749        
Costs Capitalized Subsequent to Acquisition 1,714        
Land and Improvements 367        
Building and Improvements 5,234        
Total 5,601        
Accumulated Depreciation $ 4,536        
Depreciable Lives (Years) [6] (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 1,181        
Land and Improvements 234        
Building and Improvements 4,834        
Total 5,068        
Accumulated Depreciation $ 4,376        
Depreciable Lives (Years) [7] (1)        
8000 Corporate Court Building Eleven | Office Building [Member]          
Original Cost          
Original Land $ 136        
Original Building 3,071        
Costs Capitalized Subsequent to Acquisition 1,903        
Land and Improvements 774        
Building and Improvements 4,336        
Total 5,110        
Accumulated Depreciation $ 3,455        
Depreciable Lives (Years) [6] (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 1,552        
Land and Improvements 686        
Building and Improvements 4,073        
Total 4,759        
Accumulated Depreciation $ 3,346        
Depreciable Lives (Years) [7] (1)        
7375 Boston Boulevard Building Ten | Office Building [Member]          
Original Cost          
Original Land $ 23        
Original Building 2,685        
Costs Capitalized Subsequent to Acquisition 1,005        
Land and Improvements 93        
Building and Improvements 3,620        
Total 3,713        
Accumulated Depreciation $ 2,841        
Depreciable Lives (Years) [6] (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 824        
Land and Improvements 47        
Building and Improvements 3,485        
Total 3,532        
Accumulated Depreciation $ 2,790        
Depreciable Lives (Years) [7] (1)        
7451 Boston Boulevard Building Two | Office Building [Member]          
Original Cost          
Original Land $ 249        
Original Building 1,542        
Costs Capitalized Subsequent to Acquisition 1,858        
Land and Improvements 613        
Building and Improvements 3,036        
Total 3,649        
Accumulated Depreciation $ 2,806        
Depreciable Lives (Years) [6] (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 1,545        
Land and Improvements 535        
Building and Improvements 2,801        
Total 3,336        
Accumulated Depreciation $ 2,711        
Depreciable Lives (Years) [7] (1)        
7374 Boston Boulevard Building Four | Office Building [Member]          
Original Cost          
Original Land $ 241        
Original Building 1,605        
Costs Capitalized Subsequent to Acquisition 1,664        
Land and Improvements 398        
Building and Improvements 3,112        
Total 3,510        
Accumulated Depreciation $ 2,787        
Depreciable Lives (Years) [6] (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 1,281        
Land and Improvements 303        
Building and Improvements 2,824        
Total 3,127        
Accumulated Depreciation $ 2,675        
Depreciable Lives (Years) [7] (1)        
The Skylyne | Residential Building          
Original Cost          
Original Land $ 28,962        
Original Building 239,077        
Costs Capitalized Subsequent to Acquisition 1,097        
Land and Improvements 28,962        
Building and Improvements 240,174        
Total 269,136        
Accumulated Depreciation $ 8,132        
Depreciable Lives (Years) [6] (1)        
The Skylyne | Boston Properties Limited Partnership | Residential Building          
Original Cost          
Original Land $ 28,962        
Original Building 239,077        
Costs Capitalized Subsequent to Acquisition 1,097        
Land and Improvements 28,962        
Building and Improvements 240,174        
Total 269,136        
Accumulated Depreciation $ 8,132        
Depreciable Lives (Years) [7] (1)        
Signature at Reston | Residential Building          
Original Cost          
Original Land $ 27,076        
Original Building 190,580        
Costs Capitalized Subsequent to Acquisition 838        
Land and Improvements 27,076        
Building and Improvements 191,418        
Total 218,494        
Accumulated Depreciation $ 18,534        
Depreciable Lives (Years) [6] (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 838        
Land and Improvements 27,076        
Building and Improvements 191,418        
Total 218,494        
Accumulated Depreciation $ 18,534        
Depreciable Lives (Years) [7] (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 $ 11,195        
Depreciable Lives (Years) [6] (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 $ 11,195        
Depreciable Lives (Years) [7] (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 $ 19,681        
Depreciable Lives (Years) [6] (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 $ 19,681        
Depreciable Lives (Years) [7] (1)        
The Lofts at Atlantic Wharf | Residential Building          
Original Cost          
Original Land $ 3,529        
Original Building 54,891        
Costs Capitalized Subsequent to Acquisition 2,215        
Land and Improvements 3,529        
Building and Improvements 57,106        
Total 60,635        
Accumulated Depreciation $ 15,689        
Depreciable Lives (Years) [6] (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 2,215        
Land and Improvements 3,529        
Building and Improvements 57,106        
Total 60,635        
Accumulated Depreciation $ 15,689        
Depreciable Lives (Years) [7] (1)        
Boston Cambridge Marriott | Hotel [Member]          
Original Cost          
Original Land $ 478        
Original Building 37,918        
Costs Capitalized Subsequent to Acquisition 35,117        
Land and Improvements 1,201        
Building and Improvements 72,312        
Total 73,513        
Accumulated Depreciation $ 51,600        
Depreciable Lives (Years) [6] (1)        
Boston Cambridge Marriott | Boston Properties Limited Partnership | Hotel [Member]          
Original Cost          
Original Land $ 478        
Original Building 37,918        
Costs Capitalized Subsequent to Acquisition 32,226        
Land and Improvements 478        
Building and Improvements 70,144        
Total 70,622        
Accumulated Depreciation $ 50,729        
Depreciable Lives (Years) [7] (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 $ 15,818        
Depreciable Lives (Years) [6] (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 $ 15,695        
Depreciable Lives (Years) [7] (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 $ 6,939        
Depreciable Lives (Years) [6] (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 $ 6,727        
Depreciable Lives (Years) [7] (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 $ 10,399        
Depreciable Lives (Years) [6] (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 $ 9,900        
Depreciable Lives (Years) [7] (1)        
Reston Next | Development          
Original Cost          
Original Land $ 0        
Original Building 0        
Costs Capitalized Subsequent to Acquisition 514,182        
Land and Improvements 2,901        
Building and Improvements 250,135        
Development and Construction in Progress 261,146        
Total 514,182        
Accumulated Depreciation $ 1,631        
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 514,182        
Land and Improvements 2,901        
Building and Improvements 250,135        
Development and Construction in Progress 261,146        
Total 514,182        
Accumulated Depreciation $ 1,631        
Depreciable Lives (Years) N/A        
2100 Pennsylvania Avenue | Development          
Original Cost          
Original Land $ 0        
Original Building 0        
Costs Capitalized Subsequent to Acquisition 393,094        
Land and Improvements 185,203        
Development and Construction in Progress 207,891        
Total 393,094        
Accumulated Depreciation $ 5,941        
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 393,094        
Land and Improvements 185,203        
Building and Improvements 0        
Development and Construction in Progress 207,891        
Total 393,094        
Accumulated Depreciation $ 5,941        
Depreciable Lives (Years) N/A        
325 Main Street | Development          
Original Cost          
Original Land $ 174        
Original Building 0        
Costs Capitalized Subsequent to Acquisition 286,000        
Land and Improvements 965        
Development and Construction in Progress 285,209        
Total 286,174        
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 285,807        
Land and Improvements 772        
Building and Improvements 0        
Development and Construction in Progress 285,209        
Total 285,981        
Accumulated Depreciation $ 0        
Depreciable Lives (Years) N/A        
880 Winter Street [Member] | Development          
Original Cost          
Original Land $ 15,597        
Original Building 37,255        
Costs Capitalized Subsequent to Acquisition (667)        
Land and Improvements 15,597        
Building and Improvements 19,614        
Development and Construction in Progress 16,974        
Total 52,185        
Accumulated Depreciation $ 1,247        
Depreciable Lives (Years) N/A        
880 Winter Street [Member] | Boston Properties Limited Partnership | Development          
Original Cost          
Original Land $ 15,597        
Original Building 37,255        
Costs Capitalized Subsequent to Acquisition (667)        
Land and Improvements 15,597        
Building and Improvements 19,614        
Development and Construction in Progress 16,974        
Total 52,185        
Accumulated Depreciation $ 1,247        
Depreciable Lives (Years) N/A        
180 CityPoint | Land          
Original Cost          
Original Land $ 0        
Original Building 0        
Costs Capitalized Subsequent to Acquisition 50,776        
Development and Construction in Progress 50,776        
Total $ 50,776        
Depreciable Lives (Years) N/A        
180 CityPoint | Boston Properties Limited Partnership | Development          
Original Cost          
Original Land $ 0        
Original Building 0        
Costs Capitalized Subsequent to Acquisition 50,776        
Development and Construction in Progress 50,776        
Total 50,776        
Accumulated Depreciation $ 0        
Depreciable Lives (Years) N/A        
103 CityPoint | Land          
Original Cost          
Original Land $ 0        
Original Building 0        
Costs Capitalized Subsequent to Acquisition 14,663        
Development and Construction in Progress 14,663        
Total $ 14,663        
Depreciable Lives (Years) N/A        
103 CityPoint | Boston Properties Limited Partnership | Development          
Original Cost          
Original Land $ 0        
Original Building 0        
Costs Capitalized Subsequent to Acquisition 14,663        
Development and Construction in Progress 14,663        
Total 14,663        
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 26,800        
Building and Improvements 47        
Land held for development 171,400        
Total 171,447        
Accumulated Depreciation $ 11        
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 26,800        
Building and Improvements 47        
Land held for development 171,400        
Total 171,447        
Accumulated Depreciation $ 11        
Depreciable Lives (Years) N/A        
3625 - 3635 Peterson Way | Office Building [Member]          
Original Cost          
Original Land $ 63,206        
Original Building 0        
Costs Capitalized Subsequent to Acquisition 4,541        
Land held for development 67,747        
Total $ 67,747        
Depreciable Lives (Years) [6] N/A        
3625 - 3635 Peterson Way | Boston Properties Limited Partnership | Land          
Original Cost          
Original Land $ 63,206        
Original Building 0        
Costs Capitalized Subsequent to Acquisition 4,541        
Land held for development 67,747        
Total 67,747        
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 53,432        
Land held for development 53,432        
Total $ 53,432        
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 53,432        
Land held for development 53,432        
Total 53,432        
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 3,941        
Land held for development 38,945        
Total $ 38,945        
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 3,941        
Land held for development 38,945        
Total 38,945        
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 37,418        
Land held for development 37,418        
Total $ 37,418        
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 37,418        
Land held for development 37,418        
Total 37,418        
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 30,945        
Land held for development 30,945        
Total $ 30,945        
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 30,945        
Land held for development 30,945        
Total 30,945        
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 19,887        
Land held for development 19,887        
Total $ 19,887        
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 19,887        
Land held for development 19,887        
Total 19,887        
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 14,890        
Land held for development 14,890        
Total $ 14,890        
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 14,890        
Land held for development 14,890        
Total 14,890        
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 8,381        
Land held for development 8,381        
Total $ 8,381        
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 8,381        
Land held for development 8,381        
Total 8,381        
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 2,405        
Land held for development 2,405        
Total $ 2,405        
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 2,405        
Land held for development 2,405        
Total 2,405        
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 held for development 1,249        
Total $ 1,249        
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 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 79        
Land held for development 79        
Total $ 79        
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 79        
Land held for development 79        
Total 79        
Accumulated Depreciation $ 0        
Depreciable Lives (Years) N/A        
[1] Includes pre-development costs.
[2] See Note 4.
[3] Includes unamortized deferred financing costs totaling approximately $(32.1) million.
[4] Includes Right of Use Assets - Finance Leases and Right of Use Assets - Operating Leases of approximately $214,165 and $169,778, respectively.
[5] Includes Right of Use Assets - Finance Leases of approximately $23,342.
[6] Depreciation of the buildings and improvements are calculated over lives ranging from the life of the lease to 40 years.
[7] Depreciation of the buildings and improvements are calculated over lives ranging from the life of the lease to 40 years.