XML 114 R94.htm IDEA: XBRL DOCUMENT v3.10.0.1
Real Estate and Accumulated Depreciation Schedule of Real Estate and Accumulated Depreciation (BPLP) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Encumbrances [1] $ 2,964,572  
Original Land 4,959,995  
Original Building 12,763,317  
Costs Capitalized Subsequent to Acquisition 3,882,233  
Land and improvements 5,072,568  
Buildings and Improvements 15,753,683  
Land Held for Development [2] 200,498  
Development and Construction in Progress 578,796  
Total 21,605,545  
Accumulated Depreciation 4,871,102  
Furniture, fixtures and equipment 44,351 $ 37,928
Furniture, fixtures and equipment accumulated depreciation 26,675  
Real Estate Aggregate Cost For Tax Purposes 17,900,000  
Real Estate Aggregate Accumulated Depreciation For Tax Purposes $ 3,900,000  
Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years  
Unamortized deferred finance costs $ (30,756)  
767 Fifth Avenue (the General Motors Building)    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 767 Fifth Avenue (the General Motors Building)  
Type Office  
Location New York, NY  
Encumbrances $ 2,270,534  
Original Land 1,796,252  
Original Building 1,532,654  
Costs Capitalized Subsequent to Acquisition 189,657  
Land and improvements 1,796,252  
Buildings and Improvements 1,722,311  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 3,518,563  
Accumulated Depreciation $ 271,534  
Year(s) Built / Renovated 1968  
Year(s) Acquired 2013  
Depreciable Lives (Years) [3] -1  
Prudential Center    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Prudential Center  
Type Office  
Location Boston, MA  
Encumbrances $ 0  
Original Land 92,077  
Original Building 948,357  
Costs Capitalized Subsequent to Acquisition 532,802  
Land and improvements 115,638  
Buildings and Improvements 1,457,494  
Land Held for Development 104  
Development and Construction in Progress 0  
Total 1,573,236  
Accumulated Depreciation $ 550,109  
Year(s) Built / Renovated 1965/1993/2002/2016-2017  
Year(s) Acquired 1998/1999/2000  
Depreciable Lives (Years) [3] -1  
Embarcadero Center    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Embarcadero Center  
Type Office  
Location San Francisco, CA  
Encumbrances $ 0  
Original Land 179,697  
Original Building 847,410  
Costs Capitalized Subsequent to Acquisition 368,967  
Land and improvements 195,987  
Buildings and Improvements 1,200,087  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 1,396,074  
Accumulated Depreciation $ 612,981  
Year(s) Built / Renovated 1970/1989  
Year(s) Acquired 1998-1999  
Depreciable Lives (Years) [3] -1  
399 Park Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 399 Park Avenue  
Type Office  
Location New York, NY  
Encumbrances $ 0  
Original Land 339,200  
Original Building 700,358  
Costs Capitalized Subsequent to Acquisition 247,092  
Land and improvements 354,107  
Buildings and Improvements 932,543  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 1,286,650  
Accumulated Depreciation $ 332,911  
Year(s) Built / Renovated 1961/2018  
Year(s) Acquired 2002  
Depreciable Lives (Years) [3] -1  
Salesforce Tower    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Salesforce Tower  
Type Office  
Location San Francisco, CA  
Encumbrances $ 0  
Original Land 200,349  
Original Building 919,565  
Costs Capitalized Subsequent to Acquisition 0  
Land and improvements 200,349  
Buildings and Improvements 919,565  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 1,119,914  
Accumulated Depreciation $ 9,509  
Year(s) Built / Renovated 2018  
Year(s) Acquired 2013  
Depreciable Lives (Years) [3] -1  
601 Lexington Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 601 Lexington Avenue  
Type Office  
Location New York, NY  
Encumbrances $ 658,792  
Original Land 241,600  
Original Building 494,782  
Costs Capitalized Subsequent to Acquisition 361,985  
Land and improvements 289,639  
Buildings and Improvements 637,044  
Land Held for Development 0  
Development and Construction in Progress 171,684  
Total 1,098,367  
Accumulated Depreciation $ 272,936  
Year(s) Built / Renovated 1977/1997  
Year(s) Acquired 2001  
Depreciable Lives (Years) [3] -1  
200 Clarendon Street and Garage    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 200 Clarendon Street and Garage  
Type Office  
Location Boston, MA  
Encumbrances $ 0  
Original Land 219,543  
Original Building 667,884  
Costs Capitalized Subsequent to Acquisition 164,073  
Land and improvements 219,616  
Buildings and Improvements 822,218  
Land Held for Development 9,666  
Development and Construction in Progress 0  
Total 1,051,500  
Accumulated Depreciation $ 192,137  
Year(s) Built / Renovated 1976  
Year(s) Acquired 2010  
Depreciable Lives (Years) [3] -1  
250 West 55th Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 250 West 55th Street  
Type Office  
Location New York, NY  
Encumbrances $ 0  
Original Land 285,263  
Original Building 603,167  
Costs Capitalized Subsequent to Acquisition 48,642  
Land and improvements 285,263  
Buildings and Improvements 651,809  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 937,072  
Accumulated Depreciation $ 94,434  
Year(s) Built / Renovated 2014  
Year(s) Acquired 2007  
Depreciable Lives (Years) [3] -1  
100 Federal Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 100 Federal Street  
Type Office  
Location Boston, MA  
Encumbrances $ 0  
Original Land 131,067  
Original Building 435,954  
Costs Capitalized Subsequent to Acquisition 99,702  
Land and improvements 131,067  
Buildings and Improvements 535,656  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 666,723  
Accumulated Depreciation $ 105,536  
Year(s) Built / Renovated 1971-1975/2017  
Year(s) Acquired 2012  
Depreciable Lives (Years) [3] -1  
Carnegie Center    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Carnegie Center  
Type Office  
Location Princeton, NJ  
Encumbrances $ 0  
Original Land 107,997  
Original Building 389,359  
Costs Capitalized Subsequent to Acquisition 158,752  
Land and improvements 108,948  
Buildings and Improvements 543,974  
Land Held for Development 3,186  
Development and Construction in Progress 0  
Total 656,108  
Accumulated Depreciation $ 241,570  
Year(s) Built / Renovated 1983-2016  
Year(s) Acquired 1998/1999/2000/2007/2014/2017  
Depreciable Lives (Years) [3] -1  
Times Square Tower    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Times Square Tower  
Type Office  
Location New York, NY  
Encumbrances $ 0  
Original Land 165,413  
Original Building 380,438  
Costs Capitalized Subsequent to Acquisition 94,451  
Land and improvements 169,193  
Buildings and Improvements 471,109  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 640,302  
Accumulated Depreciation $ 206,067  
Year(s) Built / Renovated 2004  
Year(s) Acquired 2000  
Depreciable Lives (Years) [3] -1  
Atlantic Wharf    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Atlantic Wharf  
Type Office  
Location Boston, MA  
Encumbrances $ 0  
Original Land 63,988  
Original Building 454,537  
Costs Capitalized Subsequent to Acquisition 17,184  
Land and improvements 63,988  
Buildings and Improvements 471,721  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 535,709  
Accumulated Depreciation $ 116,238  
Year(s) Built / Renovated 2011  
Year(s) Acquired 2007  
Depreciable Lives (Years) [3] -1  
510 Madison Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 510 Madison Avenue  
Type Office  
Location New York, NY  
Encumbrances $ 0  
Original Land 103,000  
Original Building 253,665  
Costs Capitalized Subsequent to Acquisition 24,992  
Land and improvements 103,000  
Buildings and Improvements 278,657  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 381,657  
Accumulated Depreciation $ 62,507  
Year(s) Built / Renovated 2012  
Year(s) Acquired 2010  
Depreciable Lives (Years) [3] -1  
Fountain Square    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Fountain Square  
Type Office  
Location Reston, VA  
Encumbrances $ 0  
Original Land 56,853  
Original Building 306,298  
Costs Capitalized Subsequent to Acquisition 3,170  
Land and improvements 56,853  
Buildings and Improvements 309,468  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 366,321  
Accumulated Depreciation $ 68,390  
Year(s) Built / Renovated 1986-1990  
Year(s) Acquired 2012  
Depreciable Lives (Years) [3] -1  
599 Lexington Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 599 Lexington Avenue  
Type Office  
Location New York, NY  
Encumbrances $ 0  
Original Land 81,040  
Original Building 100,507  
Costs Capitalized Subsequent to Acquisition 174,213  
Land and improvements 87,852  
Buildings and Improvements 267,908  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 355,760  
Accumulated Depreciation $ 170,678  
Year(s) Built / Renovated 1986  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
680 Folsom Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 680 Folsom Street  
Type Office  
Location San Francisco, CA  
Encumbrances $ 0  
Original Land 72,545  
Original Building 219,766  
Costs Capitalized Subsequent to Acquisition 7,829  
Land and improvements 72,545  
Buildings and Improvements 227,595  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 300,140  
Accumulated Depreciation $ 38,230  
Year(s) Built / Renovated 2014  
Year(s) Acquired 2012  
Depreciable Lives (Years) [3] -1  
601 Massachusetts Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 601 Massachusetts Avenue  
Type Office  
Location Washington, DC  
Encumbrances $ 0  
Original Land 95,310  
Original Building 165,173  
Costs Capitalized Subsequent to Acquisition 3,900  
Land and improvements 95,322  
Buildings and Improvements 169,061  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 264,383  
Accumulated Depreciation $ 18,263  
Year(s) Built / Renovated 2016  
Year(s) Acquired 2008  
Depreciable Lives (Years) [3] -1  
South of Market and Democracy Tower    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name South of Market and Democracy Tower  
Type Office  
Location Reston, VA  
Encumbrances $ 0  
Original Land 13,603  
Original Building 237,479  
Costs Capitalized Subsequent to Acquisition 12,428  
Land and improvements 13,687  
Buildings and Improvements 249,823  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 263,510  
Accumulated Depreciation $ 91,072  
Year(s) Built / Renovated 2008-2009  
Year(s) Acquired 2003  
Depreciable Lives (Years) [3] -1  
Bay Colony Corporate Center    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Bay Colony Corporate Center  
Type Office  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 18,789  
Original Building 148,451  
Costs Capitalized Subsequent to Acquisition 77,133  
Land and improvements 18,789  
Buildings and Improvements 225,584  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 244,373  
Accumulated Depreciation $ 68,903  
Year(s) Built / Renovated 1985-1989  
Year(s) Acquired 2011  
Depreciable Lives (Years) [3] -1  
Gateway Center    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Gateway Center  
Type Office  
Location San Francisco, CA  
Encumbrances $ 0  
Original Land 28,255  
Original Building 139,245  
Costs Capitalized Subsequent to Acquisition 64,831  
Land and improvements 30,627  
Buildings and Improvements 201,704  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 232,331  
Accumulated Depreciation $ 107,640  
Year(s) Built / Renovated 1984/1986/2002  
Year(s) Acquired 1999  
Depreciable Lives (Years) [3] -1  
535 Mission Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 535 Mission Street  
Type Office  
Location San Francisco, CA  
Encumbrances $ 0  
Original Land 40,933  
Original Building 148,378  
Costs Capitalized Subsequent to Acquisition 3,259  
Land and improvements 40,933  
Buildings and Improvements 151,637  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 192,570  
Accumulated Depreciation $ 20,576  
Year(s) Built / Renovated 2015  
Year(s) Acquired 2013  
Depreciable Lives (Years) [3] -1  
2200 Pennsylvania Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 2200 Pennsylvania Avenue  
Type Office  
Location Washington, DC  
Encumbrances $ 0  
Original Land 0  
Original Building 183,541  
Costs Capitalized Subsequent to Acquisition 4,535  
Land and improvements 0  
Buildings and Improvements 188,076  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 188,076  
Accumulated Depreciation $ 52,280  
Year(s) Built / Renovated 2011  
Year(s) Acquired 2008  
Depreciable Lives (Years) [3] -1  
Mountain View Research Park    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Mountain View Research Park  
Type Office  
Location Mountain View, CA  
Encumbrances $ 0  
Original Land 95,066  
Original Building 68,373  
Costs Capitalized Subsequent to Acquisition 9,988  
Land and improvements 95,066  
Buildings and Improvements 78,361  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 173,427  
Accumulated Depreciation $ 17,866  
Year(s) Built / Renovated 1977-1981/2007-2013  
Year(s) Acquired 2013  
Depreciable Lives (Years) [3] -1  
Reservoir Place    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Reservoir Place  
Type Office  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 18,605  
Original Building 104,124  
Costs Capitalized Subsequent to Acquisition 45,144  
Land and improvements 20,108  
Buildings and Improvements 147,765  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 167,873  
Accumulated Depreciation $ 64,683  
Year(s) Built / Renovated 1955/1987/2017  
Year(s) Acquired 1997/1998  
Depreciable Lives (Years) [3] -1  
1330 Connecticut Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 1330 Connecticut Avenue  
Type Office  
Location Washington, DC  
Encumbrances $ 0  
Original Land 25,982  
Original Building 82,311  
Costs Capitalized Subsequent to Acquisition 36,089  
Land and improvements 27,135  
Buildings and Improvements 117,247  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 144,382  
Accumulated Depreciation $ 27,535  
Year(s) Built / Renovated 1984/2018  
Year(s) Acquired 2004  
Depreciable Lives (Years) [3] -1  
Kingstowne Towne Center    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Kingstowne Towne Center  
Type Office  
Location Alexandria, VA  
Encumbrances $ 0  
Original Land 18,021  
Original Building 109,038  
Costs Capitalized Subsequent to Acquisition 2,098  
Land and improvements 18,062  
Buildings and Improvements 111,095  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 129,157  
Accumulated Depreciation $ 41,469  
Year(s) Built / Renovated 2003-2006  
Year(s) Acquired 2007  
Depreciable Lives (Years) [3] -1  
One Freedom Square    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name One Freedom Square  
Type Office  
Location Reston, VA  
Encumbrances $ 0  
Original Land 9,929  
Original Building 84,504  
Costs Capitalized Subsequent to Acquisition 32,256  
Land and improvements 11,293  
Buildings and Improvements 115,396  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 126,689  
Accumulated Depreciation $ 54,652  
Year(s) Built / Renovated 2000  
Year(s) Acquired 2003  
Depreciable Lives (Years) [3] -1  
Weston Corporate Center    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Weston Corporate Center  
Type Office  
Location Weston, MA  
Encumbrances $ 0  
Original Land 25,753  
Original Building 92,312  
Costs Capitalized Subsequent to Acquisition (123)  
Land and improvements 25,854  
Buildings and Improvements 92,088  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 117,942  
Accumulated Depreciation $ 26,176  
Year(s) Built / Renovated 2010  
Year(s) Acquired 2001  
Depreciable Lives (Years) [3] -1  
Capital Gallery    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Capital Gallery  
Type Office  
Location Washington, DC  
Encumbrances $ 0  
Original Land 4,725  
Original Building 29,565  
Costs Capitalized Subsequent to Acquisition 87,231  
Land and improvements 8,662  
Buildings and Improvements 112,859  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 121,521  
Accumulated Depreciation $ 67,759  
Year(s) Built / Renovated 1981/2006  
Year(s) Acquired 2007  
Depreciable Lives (Years) [3] -1  
Two Freedom Square    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Two Freedom Square  
Type Office  
Location Reston, VA  
Encumbrances $ 0  
Original Land 13,930  
Original Building 77,739  
Costs Capitalized Subsequent to Acquisition 23,427  
Land and improvements 15,420  
Buildings and Improvements 99,676  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 115,096  
Accumulated Depreciation $ 51,291  
Year(s) Built / Renovated 2001  
Year(s) Acquired 2003  
Depreciable Lives (Years) [3] -1  
One and Two Reston Overlook    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name One and Two Reston Overlook  
Type Office  
Location Reston, VA  
Encumbrances $ 0  
Original Land 16,456  
Original Building 66,192  
Costs Capitalized Subsequent to Acquisition 24,181  
Land and improvements 16,179  
Buildings and Improvements 90,650  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 106,829  
Accumulated Depreciation $ 47,668  
Year(s) Built / Renovated 1999  
Year(s) Acquired 2000  
Depreciable Lives (Years) [3] -1  
140 Kendrick Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 140 Kendrick Street  
Type Office  
Location Needham, MA  
Encumbrances $ 0  
Original Land 18,095  
Original Building 66,905  
Costs Capitalized Subsequent to Acquisition 17,553  
Land and improvements 19,092  
Buildings and Improvements 83,461  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 102,553  
Accumulated Depreciation $ 32,360  
Year(s) Built / Renovated 2000  
Year(s) Acquired 2004  
Depreciable Lives (Years) [3] -1  
355 Main Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 355 Main Street  
Type Office  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 18,863  
Original Building 53,346  
Costs Capitalized Subsequent to Acquisition 23,701  
Land and improvements 21,173  
Buildings and Improvements 74,737  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 95,910  
Accumulated Depreciation $ 23,691  
Year(s) Built / Renovated 1981/1996/2013  
Year(s) Acquired 2006  
Depreciable Lives (Years) [3] -1  
Discovery Square    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Discovery Square  
Type Office  
Location Reston, VA  
Encumbrances $ 0  
Original Land 11,198  
Original Building 71,782  
Costs Capitalized Subsequent to Acquisition 17,753  
Land and improvements 12,533  
Buildings and Improvements 88,200  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 100,733  
Accumulated Depreciation $ 39,574  
Year(s) Built / Renovated 2001  
Year(s) Acquired 2003  
Depreciable Lives (Years) [3] -1  
10 CityPoint    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 10 CityPoint  
Type Office  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 1,953  
Original Building 85,752  
Costs Capitalized Subsequent to Acquisition 4,515  
Land and improvements 2,116  
Buildings and Improvements 90,104  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 92,220  
Accumulated Depreciation $ 7,772  
Year(s) Built / Renovated 2016  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
90 Broadway    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 90 Broadway  
Type Office  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 19,104  
Original Building 52,078  
Costs Capitalized Subsequent to Acquisition 18,363  
Land and improvements 20,785  
Buildings and Improvements 68,760  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 89,545  
Accumulated Depreciation $ 21,302  
Year(s) Built / Renovated 1983/1998/2013  
Year(s) Acquired 2006  
Depreciable Lives (Years) [3] -1  
230 CityPoint    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 230 CityPoint  
Type Office  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 13,189  
Original Building 49,823  
Costs Capitalized Subsequent to Acquisition 21,914  
Land and improvements 13,593  
Buildings and Improvements 71,333  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 84,926  
Accumulated Depreciation $ 26,357  
Year(s) Built / Renovated 1992  
Year(s) Acquired 2005  
Depreciable Lives (Years) [3] -1  
77 CityPoint    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 77 CityPoint  
Type Office  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 13,847  
Original Building 60,383  
Costs Capitalized Subsequent to Acquisition 5,858  
Land and improvements 13,873  
Buildings and Improvements 66,215  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 80,088  
Accumulated Depreciation $ 25,107  
Year(s) Built / Renovated 2008  
Year(s) Acquired 2001  
Depreciable Lives (Years) [3] -1  
Waltham Weston Corporate Center    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Waltham Weston Corporate Center  
Type Office  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 10,385  
Original Building 60,694  
Costs Capitalized Subsequent to Acquisition 11,449  
Land and improvements 11,097  
Buildings and Improvements 71,431  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 82,528  
Accumulated Depreciation $ 32,739  
Year(s) Built / Renovated 2003  
Year(s) Acquired 1999  
Depreciable Lives (Years) [3] -1  
3625-3635 Peterson Way    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 3625-3635 Peterson Way  
Type Office  
Location Santa Clara, CA  
Encumbrances $ 0  
Original Land 63,206  
Original Building 14,879  
Costs Capitalized Subsequent to Acquisition 673  
Land and improvements 63,206  
Buildings and Improvements 14,879  
Land Held for Development 673  
Development and Construction in Progress 0  
Total 78,758  
Accumulated Depreciation $ 8,146  
Year(s) Built / Renovated 1979  
Year(s) Acquired 2016  
Depreciable Lives (Years) [3] -1  
2440 West El Camino Real    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 2440 West El Camino Real  
Type Office  
Location Mountain View, CA  
Encumbrances $ 0  
Original Land 16,741  
Original Building 51,285  
Costs Capitalized Subsequent to Acquisition 3,411  
Land and improvements 16,741  
Buildings and Improvements 54,696  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 71,437  
Accumulated Depreciation $ 12,562  
Year(s) Built / Renovated 1987/2003  
Year(s) Acquired 2011  
Depreciable Lives (Years) [3] -1  
300 Binney Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 300 Binney Street  
Type Office  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 18,080  
Original Building 51,262  
Costs Capitalized Subsequent to Acquisition 140  
Land and improvements 18,080  
Buildings and Improvements 51,402  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 69,482  
Accumulated Depreciation $ 9,450  
Year(s) Built / Renovated 2013  
Year(s) Acquired 2009  
Depreciable Lives (Years) [3] (1)  
Wisconsin Place    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Wisconsin Place  
Type Office  
Location Chevy Chase, MD  
Encumbrances $ 0  
Original Land 0  
Original Building 53,349  
Costs Capitalized Subsequent to Acquisition 14,889  
Land and improvements 0  
Buildings and Improvements 68,238  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 68,238  
Accumulated Depreciation $ 22,936  
Year(s) Built / Renovated 2009  
Year(s) Acquired 2004  
Depreciable Lives (Years) [3] -1  
191 Spring Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 191 Spring Street  
Type Office  
Location Lexington, MA  
Encumbrances $ 0  
Original Land 2,850  
Original Building 59,751  
Costs Capitalized Subsequent to Acquisition 6,235  
Land and improvements 3,151  
Buildings and Improvements 65,685  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 68,836  
Accumulated Depreciation $ 19,543  
Year(s) Built / Renovated 1971/1995/2018  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] (1)  
Reston Corporate Center    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Reston Corporate Center  
Type Office  
Location Reston, VA  
Encumbrances $ 0  
Original Land 9,135  
Original Building 50,857  
Costs Capitalized Subsequent to Acquisition 6,236  
Land and improvements 10,148  
Buildings and Improvements 56,080  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 66,228  
Accumulated Depreciation $ 28,315  
Year(s) Built / Renovated 1984  
Year(s) Acquired 1998  
Depreciable Lives (Years) [3] -1  
New Dominion Technology Park, Bldg. Two    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name New Dominion Technology Park, Bldg. Two  
Type Office  
Location Herndon, VA  
Encumbrances $ 0  
Original Land 5,584  
Original Building 51,868  
Costs Capitalized Subsequent to Acquisition 4,157  
Land and improvements 6,510  
Buildings and Improvements 55,099  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 61,609  
Accumulated Depreciation $ 25,421  
Year(s) Built / Renovated 2004  
Year(s) Acquired 1998  
Depreciable Lives (Years) [3] -1  
255 Main Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 255 Main Street  
Type Office  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 134  
Original Building 25,110  
Costs Capitalized Subsequent to Acquisition 29,672  
Land and improvements 548  
Buildings and Improvements 54,368  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 54,916  
Accumulated Depreciation $ 30,180  
Year(s) Built / Renovated 1987  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
200 West Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 200 West Street  
Type Office  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 16,148  
Original Building 24,983  
Costs Capitalized Subsequent to Acquisition 11,120  
Land and improvements 16,813  
Buildings and Improvements 35,438  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 52,251  
Accumulated Depreciation $ 22,544  
Year(s) Built / Renovated 1999  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
New Dominion Technology Park, Bldg. One    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name New Dominion Technology Park, Bldg. One  
Type Office  
Location Herndon, VA  
Encumbrances $ 29,675  
Original Land 3,880  
Original Building 43,227  
Costs Capitalized Subsequent to Acquisition 3,927  
Land and improvements 4,583  
Buildings and Improvements 46,451  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 51,034  
Accumulated Depreciation $ 27,542  
Year(s) Built / Renovated 2001  
Year(s) Acquired 1998  
Depreciable Lives (Years) [3] -1  
Sumner Square    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Sumner Square  
Type Office  
Location Washington, DC  
Encumbrances $ 0  
Original Land 624  
Original Building 28,745  
Costs Capitalized Subsequent to Acquisition 19,054  
Land and improvements 1,478  
Buildings and Improvements 46,945  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 48,423  
Accumulated Depreciation $ 25,384  
Year(s) Built / Renovated 1985  
Year(s) Acquired 1999  
Depreciable Lives (Years) [3] -1  
University Place    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name University Place  
Type Office  
Location Cambridge, MA  
Encumbrances $ 5,571  
Original Land 0  
Original Building 37,091  
Costs Capitalized Subsequent to Acquisition 9,001  
Land and improvements 390  
Buildings and Improvements 45,702  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 46,092  
Accumulated Depreciation $ 27,871  
Year(s) Built / Renovated 1985  
Year(s) Acquired 1998  
Depreciable Lives (Years) [3] -1  
2600 Tower Oaks Boulevard    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 2600 Tower Oaks Boulevard  
Type Office  
Location Rockville, MD  
Encumbrances $ 0  
Original Land 4,243  
Original Building 31,125  
Costs Capitalized Subsequent to Acquisition 6,517  
Land and improvements 4,244  
Buildings and Improvements 37,641  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 41,885  
Accumulated Depreciation $ 21,426  
Year(s) Built / Renovated 2001  
Year(s) Acquired 1998  
Depreciable Lives (Years) [3] -1  
North First Business Park    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name North First Business Park  
Type Office  
Location San Jose, CA  
Encumbrances $ 0  
Original Land 23,398  
Original Building 13,069  
Costs Capitalized Subsequent to Acquisition 4,613  
Land and improvements 23,377  
Buildings and Improvements 17,703  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 41,080  
Accumulated Depreciation $ 16,076  
Year(s) Built / Renovated 1981  
Year(s) Acquired 2007  
Depreciable Lives (Years) [3] -1  
150 Broadway    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 150 Broadway  
Type Office  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 850  
Original Building 25,042  
Costs Capitalized Subsequent to Acquisition 8,540  
Land and improvements 1,323  
Buildings and Improvements 33,109  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 34,432  
Accumulated Depreciation $ 18,404  
Year(s) Built / Renovated 1999  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
325 Main Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 325 Main Street  
Type Office  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 174  
Original Building 12,200  
Costs Capitalized Subsequent to Acquisition 16,437  
Land and improvements 965  
Buildings and Improvements 23,319  
Land Held for Development 4,527  
Development and Construction in Progress 0  
Total 28,811  
Accumulated Depreciation $ 13,676  
Year(s) Built / Renovated 1987/2013  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
105 Broadway    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 105 Broadway  
Type Office  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 1,299  
Original Building 12,943  
Costs Capitalized Subsequent to Acquisition 9,401  
Land and improvements 2,395  
Buildings and Improvements 21,248  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 23,643  
Accumulated Depreciation $ 13,950  
Year(s) Built / Renovated 1990  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
Lexington Office Park    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Lexington Office Park  
Type Office  
Location Lexington, MA  
Encumbrances $ 0  
Original Land 998  
Original Building 1,426  
Costs Capitalized Subsequent to Acquisition 18,700  
Land and improvements 1,264  
Buildings and Improvements 19,860  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 21,124  
Accumulated Depreciation $ 13,614  
Year(s) Built / Renovated 1982  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
201 Spring Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 201 Spring Street  
Type Office  
Location Lexington, MA  
Encumbrances $ 0  
Original Land 2,849  
Original Building 15,303  
Costs Capitalized Subsequent to Acquisition 1,390  
Land and improvements 3,124  
Buildings and Improvements 16,418  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 19,542  
Accumulated Depreciation $ 8,344  
Year(s) Built / Renovated 1997  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
The Point    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name The Point  
Type Office  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 6,395  
Original Building 10,040  
Costs Capitalized Subsequent to Acquisition 431  
Land and improvements 6,480  
Buildings and Improvements 10,386  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 16,866  
Accumulated Depreciation $ 1,031  
Year(s) Built / Renovated 2015  
Year(s) Acquired 2007  
Depreciable Lives (Years) [3] -1  
690 Folsom Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 690 Folsom Street  
Type Office  
Location San Francisco, CA  
Encumbrances $ 0  
Original Land 3,219  
Original Building 11,038  
Costs Capitalized Subsequent to Acquisition 1,157  
Land and improvements 3,219  
Buildings and Improvements 12,195  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 15,414  
Accumulated Depreciation $ 1,790  
Year(s) Built / Renovated 2015  
Year(s) Acquired 2012  
Depreciable Lives (Years) [3] -1  
92-100 Hayden Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 92-100 Hayden Avenue  
Type Office  
Location Lexington, MA  
Encumbrances $ 0  
Original Land 594  
Original Building 6,748  
Costs Capitalized Subsequent to Acquisition 7,255  
Land and improvements 802  
Buildings and Improvements 13,795  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 14,597  
Accumulated Depreciation $ 11,809  
Year(s) Built / Renovated 1985  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
181 Spring Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 181 Spring Street  
Type Office  
Location Lexington, MA  
Encumbrances $ 0  
Original Land 1,066  
Original Building 9,520  
Costs Capitalized Subsequent to Acquisition 2,230  
Land and improvements 1,160  
Buildings and Improvements 11,656  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 12,816  
Accumulated Depreciation $ 5,424  
Year(s) Built / Renovated 1999  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
195 West Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 195 West Street  
Type Office  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 1,611  
Original Building 6,652  
Costs Capitalized Subsequent to Acquisition 4,270  
Land and improvements 1,858  
Buildings and Improvements 10,675  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 12,533  
Accumulated Depreciation $ 8,330  
Year(s) Built / Renovated 1990  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
33 Hayden Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 33 Hayden Avenue  
Type Office  
Location Lexington, MA  
Encumbrances $ 0  
Original Land 266  
Original Building 3,234  
Costs Capitalized Subsequent to Acquisition 8,223  
Land and improvements 425  
Buildings and Improvements 11,298  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 11,723  
Accumulated Depreciation $ 9,033  
Year(s) Built / Renovated 1979  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
7501 Boston Boulevard, Building Seven    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 7501 Boston Boulevard, Building Seven  
Type Office  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 665  
Original Building 9,273  
Costs Capitalized Subsequent to Acquisition 819  
Land and improvements 791  
Buildings and Improvements 9,966  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 10,757  
Accumulated Depreciation $ 5,121  
Year(s) Built / Renovated 1997  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
7450 Boston Boulevard, Building Three    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 7450 Boston Boulevard, Building Three  
Type Office  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 1,165  
Original Building 4,681  
Costs Capitalized Subsequent to Acquisition 3,278  
Land and improvements 1,430  
Buildings and Improvements 7,694  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 9,124  
Accumulated Depreciation $ 3,733  
Year(s) Built / Renovated 1987  
Year(s) Acquired 1998  
Depreciable Lives (Years) [3] -1  
7435 Boston Boulevard, Building One    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 7435 Boston Boulevard, Building One  
Type Office  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 392  
Original Building 3,822  
Costs Capitalized Subsequent to Acquisition 4,737  
Land and improvements 659  
Buildings and Improvements 8,292  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 8,951  
Accumulated Depreciation $ 5,917  
Year(s) Built / Renovated 1982  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
8000 Grainger Court, Building Five    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 8000 Grainger Court, Building Five  
Type Office  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 366  
Original Building 4,282  
Costs Capitalized Subsequent to Acquisition 3,536  
Land and improvements 601  
Buildings and Improvements 7,583  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 8,184  
Accumulated Depreciation $ 5,864  
Year(s) Built / Renovated 1984  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
250 Binney Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 250 Binney Street  
Type Office  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 110  
Original Building 4,483  
Costs Capitalized Subsequent to Acquisition 3,593  
Land and improvements 273  
Buildings and Improvements 7,913  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 8,186  
Accumulated Depreciation $ 5,448  
Year(s) Built / Renovated 1983  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
453 Ravendale Drive    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 453 Ravendale Drive  
Type Office  
Location Mountain View, CA  
Encumbrances $ 0  
Original Land 5,477  
Original Building 1,090  
Costs Capitalized Subsequent to Acquisition 676  
Land and improvements 5,477  
Buildings and Improvements 1,766  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 7,243  
Accumulated Depreciation $ 558  
Year(s) Built / Renovated 1977  
Year(s) Acquired 2012  
Depreciable Lives (Years) [3] -1  
7300 Boston Boulevard, Building Thirteen    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 7300 Boston Boulevard, Building Thirteen  
Type Office  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 608  
Original Building 4,773  
Costs Capitalized Subsequent to Acquisition 1,438  
Land and improvements 661  
Buildings and Improvements 6,158  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 6,819  
Accumulated Depreciation $ 3,011  
Year(s) Built / Renovated 2002  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
17 Hartwell Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 17 Hartwell Avenue  
Type Office  
Location Lexington, MA  
Encumbrances $ 0  
Original Land 26  
Original Building 150  
Costs Capitalized Subsequent to Acquisition 6,064  
Land and improvements 65  
Buildings and Improvements 6,175  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 6,240  
Accumulated Depreciation $ 1,445  
Year(s) Built / Renovated 1968  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
7601 Boston Boulevard, Building Eight    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 7601 Boston Boulevard, Building Eight  
Type Office  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 200  
Original Building 878  
Costs Capitalized Subsequent to Acquisition 5,373  
Land and improvements 551  
Buildings and Improvements 5,900  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 6,451  
Accumulated Depreciation $ 4,487  
Year(s) Built / Renovated 1986  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
7500 Boston Boulevard, Building Six    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 7500 Boston Boulevard, Building Six  
Type Office  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 138  
Original Building 3,749  
Costs Capitalized Subsequent to Acquisition 1,673  
Land and improvements 406  
Buildings and Improvements 5,154  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 5,560  
Accumulated Depreciation $ 4,121  
Year(s) Built / Renovated 1985  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
8000 Corporate Court, Building Eleven    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 8000 Corporate Court, Building Eleven  
Type Office  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 136  
Original Building 3,071  
Costs Capitalized Subsequent to Acquisition 1,596  
Land and improvements 774  
Buildings and Improvements 4,029  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 4,803  
Accumulated Depreciation $ 3,051  
Year(s) Built / Renovated 1989  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
7375 Boston Boulevard, Building Ten    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 7375 Boston Boulevard, Building Ten  
Type Office  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 23  
Original Building 2,685  
Costs Capitalized Subsequent to Acquisition 992  
Land and improvements 93  
Buildings and Improvements 3,607  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 3,700  
Accumulated Depreciation $ 2,593  
Year(s) Built / Renovated 1988  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
7374 Boston Boulevard, Building Four    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 7374 Boston Boulevard, Building Four  
Type Office  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 241  
Original Building 1,605  
Costs Capitalized Subsequent to Acquisition 1,828  
Land and improvements 398  
Buildings and Improvements 3,276  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 3,674  
Accumulated Depreciation $ 2,685  
Year(s) Built / Renovated 1984  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
7451 Boston Boulevard, Building Two    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 7451 Boston Boulevard, Building Two  
Type Office  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 249  
Original Building 1,542  
Costs Capitalized Subsequent to Acquisition 1,659  
Land and improvements 613  
Buildings and Improvements 2,837  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 3,450  
Accumulated Depreciation $ 2,527  
Year(s) Built / Renovated 1982  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
32 Hartwell Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 32 Hartwell Avenue  
Type Office  
Location Lexington, MA  
Encumbrances $ 0  
Original Land 168  
Original Building 1,943  
Costs Capitalized Subsequent to Acquisition 817  
Land and improvements 314  
Buildings and Improvements 2,614  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 2,928  
Accumulated Depreciation $ 1,821  
Year(s) Built / Renovated 1968/1979/1987  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
164 Lexington Road    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 164 Lexington Road  
Type Office  
Location Billerica, MA  
Encumbrances $ 0  
Original Land 592  
Original Building 1,370  
Costs Capitalized Subsequent to Acquisition 319  
Land and improvements 643  
Buildings and Improvements 1,638  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 2,281  
Accumulated Depreciation $ 906  
Year(s) Built / Renovated 1982  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
Signature at Reston    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Signature at Reston  
Type Residential  
Location Reston, VA  
Encumbrances $ 0  
Original Land 27,076  
Original Building 190,580  
Costs Capitalized Subsequent to Acquisition 0  
Land and improvements 27,076  
Buildings and Improvements 190,580  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 217,656  
Accumulated Depreciation $ 3,938  
Year(s) Built / Renovated 2018  
Year(s) Acquired 2013  
Depreciable Lives (Years) [3] -1  
Proto Kendall Square    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Proto Kendall Square  
Type Residential  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 9,243  
Original Building 127,248  
Costs Capitalized Subsequent to Acquisition 0  
Land and improvements 9,243  
Buildings and Improvements 127,248  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 136,491  
Accumulated Depreciation $ 1,324  
Year(s) Built / Renovated 2018  
Year(s) Acquired 2015  
Depreciable Lives (Years) [3] -1  
The Avant at Reston Town Center    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name The Avant at Reston Town Center  
Type Residential  
Location Reston, VA  
Encumbrances $ 0  
Original Land 20,350  
Original Building 91,995  
Costs Capitalized Subsequent to Acquisition 830  
Land and improvements 20,350  
Buildings and Improvements 92,825  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 113,175  
Accumulated Depreciation $ 12,254  
Year(s) Built / Renovated 2014  
Year(s) Acquired 2010  
Depreciable Lives (Years) [3] -1  
The Lofts at Atlantic Wharf    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name The Lofts at Atlantic Wharf  
Type Residential  
Location Boston, MA  
Encumbrances $ 0  
Original Land 3,529  
Original Building 54,891  
Costs Capitalized Subsequent to Acquisition 1,768  
Land and improvements 3,529  
Buildings and Improvements 56,659  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 60,188  
Accumulated Depreciation $ 11,131  
Year(s) Built / Renovated 2011  
Year(s) Acquired 2007  
Depreciable Lives (Years) [3] -1  
Boston Marriott Cambridge    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Boston Marriott Cambridge  
Type Hotel  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 478  
Original Building 37,918  
Costs Capitalized Subsequent to Acquisition 36,697  
Land and improvements 1,201  
Buildings and Improvements 73,892  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 75,093  
Accumulated Depreciation $ 46,576  
Year(s) Built / Renovated 1986/2017  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
Kendall Center Green Garage    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Kendall Center Green Garage  
Type Garage  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 0  
Original Building 35,035  
Costs Capitalized Subsequent to Acquisition 7,448  
Land and improvements 103  
Buildings and Improvements 42,380  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 42,483  
Accumulated Depreciation $ 12,208  
Year(s) Built / Renovated 1984  
Year(s) Acquired 2006  
Depreciable Lives (Years) [3] -1  
Kendall Center Yellow Garage    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Kendall Center Yellow Garage  
Type Garage  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 1,256  
Original Building 15,697  
Costs Capitalized Subsequent to Acquisition 1,621  
Land and improvements 1,434  
Buildings and Improvements 17,140  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 18,574  
Accumulated Depreciation $ 5,643  
Year(s) Built / Renovated 2006  
Year(s) Acquired 2004  
Depreciable Lives (Years) [3] -1  
Kendall Center Blue Garage    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Kendall Center Blue Garage  
Type Garage  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 1,163  
Original Building 11,633  
Costs Capitalized Subsequent to Acquisition 2,145  
Land and improvements 1,579  
Buildings and Improvements 13,362  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 14,941  
Accumulated Depreciation $ 9,437  
Year(s) Built / Renovated 1990  
Year(s) Acquired 1997  
Depreciable Lives (Years) [3] -1  
145 Broadway    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 145 Broadway  
Type Development  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 121  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 223,845  
Land and improvements 324  
Buildings and Improvements 0  
Land Held for Development 0  
Development and Construction in Progress 223,642  
Total 223,966  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 1997  
Depreciable Lives (Years) N/A  
MacArthur Station Residences    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name MacArthur Station Residences  
Type Development  
Location Oakland, CA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 87,159  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 0  
Development and Construction in Progress 87,159  
Total 87,159  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired N/A  
Depreciable Lives (Years) N/A  
20 CityPoint    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 20 CityPoint  
Type Development  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 0  
Original Building 6,287  
Costs Capitalized Subsequent to Acquisition 46,024  
Land and improvements 0  
Buildings and Improvements 6,287  
Land Held for Development 0  
Development and Construction in Progress 46,024  
Total 52,311  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 2007  
Depreciable Lives (Years) N/A  
Reston Gateway    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Reston Gateway  
Type Development  
Location Reston, VA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 25,167  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 0  
Development and Construction in Progress 25,167  
Total 25,167  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 1998  
Depreciable Lives (Years) N/A  
17Fifty Presidents Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 17Fifty Presidents Street  
Type Development  
Location Reston, VA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 25,120  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 0  
Development and Construction in Progress 25,120  
Total 25,120  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 2013  
Depreciable Lives (Years) N/A  
North First Master Plan    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name North First Master Plan  
Type Land  
Location San Jose, CA  
Encumbrances $ 0  
Original Land 35,004  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 3,932  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 38,936  
Development and Construction in Progress 0  
Total 38,936  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 2007  
Depreciable Lives (Years) N/A  
Plaza at Almaden    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Plaza at Almaden  
Type Land  
Location San Jose, CA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 29,928  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 29,928  
Development and Construction in Progress 0  
Total 29,928  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 2006  
Depreciable Lives (Years) N/A  
Springfield Metro Center    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Springfield Metro Center  
Type Land  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 19,823  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 19,823  
Development and Construction in Progress 0  
Total 19,823  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 2007  
Depreciable Lives (Years) N/A  
214 Third Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 214 Third Avenue  
Type Land  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 15,233  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 15,233  
Development and Construction in Progress 0  
Total 15,233  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 2006  
Depreciable Lives (Years) N/A  
Platform 16    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Platform 16  
Type Land  
Location San Jose, CA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 12,962  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 12,962  
Development and Construction in Progress 0  
Total 12,962  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 2018  
Depreciable Lives (Years) N/A  
103 Fourth Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 103 Fourth Avenue  
Type Land  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 12,208  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 12,208  
Development and Construction in Progress 0  
Total 12,208  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 2007  
Depreciable Lives (Years) N/A  
Reston Gateway Master Plan    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Reston Gateway Master Plan  
Type Land  
Location Reston, VA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 11,014  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 11,014  
Development and Construction in Progress 0  
Total 11,014  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 1998  
Depreciable Lives (Years) N/A  
Fourth and Harrison    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Fourth and Harrison  
Type Land  
Location San Francisco, CA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 10,350  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 10,350  
Development and Construction in Progress 0  
Total 10,350  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired N/A  
Depreciable Lives (Years) N/A  
2100 Pennsylvania Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 2100 Pennsylvania Avenue  
Type Land  
Location Washington, DC  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 9,700  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 9,700  
Development and Construction in Progress 0  
Total 9,700  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired N/A  
Depreciable Lives (Years) N/A  
Crane Meadow    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Crane Meadow  
Type Land  
Location Marlborough, MA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 8,852  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 8,852  
Development and Construction in Progress 0  
Total 8,852  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 2000  
Depreciable Lives (Years) N/A  
Washingtonian North    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Washingtonian North  
Type Land  
Location Gaithersburg, MD  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 7,473  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 7,473  
Development and Construction in Progress 0  
Total 7,473  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 1998  
Depreciable Lives (Years) N/A  
Broad Run Business Park    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Broad Run Business Park  
Type Land  
Location Loudoun County, VA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 2,388  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 2,388  
Development and Construction in Progress 0  
Total 2,388  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 1998  
Depreciable Lives (Years) N/A  
Kendall Center Master Plan    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Kendall Center Master Plan  
Type Land  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 2,199  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 2,199  
Development and Construction in Progress 0  
Total 2,199  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 1997  
Depreciable Lives (Years) N/A  
Weston Quarry    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Weston Quarry  
Type Land  
Location Weston, MA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 1,237  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 1,237  
Development and Construction in Progress 0  
Total 1,237  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 2001  
Depreciable Lives (Years) N/A  
Reston Overlook Master Plan    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Reston Overlook Master Plan  
Type Land  
Location Reston, VA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 39  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 39  
Development and Construction in Progress 0  
Total 39  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 2000  
Depreciable Lives (Years) N/A  
Boston Properties Limited Partnership    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Encumbrances [4] $ 2,964,572  
Original Land 4,959,995  
Original Building 12,763,317  
Costs Capitalized Subsequent to Acquisition 3,483,877  
Land and improvements 4,971,475  
Buildings and Improvements 15,456,420  
Land Held for Development [5] 200,498  
Development and Construction in Progress 578,796  
Total 21,207,189  
Accumulated Depreciation 4,773,800  
Furniture, fixtures and equipment 44,351 $ 37,928
Furniture, fixtures and equipment accumulated depreciation 26,675  
Real Estate Aggregate Cost For Tax Purposes 19,900,000  
Real Estate Aggregate Accumulated Depreciation For Tax Purposes $ 4,300,000  
Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years  
Unamortized deferred finance costs $ (30,800)  
Boston Properties Limited Partnership | 767 Fifth Avenue (the General Motors Building)    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 767 Fifth Avenue (the General Motors Building)  
Type Office  
Location New York, NY  
Encumbrances $ 2,270,534  
Original Land 1,796,252  
Original Building 1,532,654  
Costs Capitalized Subsequent to Acquisition 189,657  
Land and improvements 1,796,252  
Buildings and Improvements 1,722,311  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 3,518,563  
Accumulated Depreciation $ 271,534  
Year(s) Built / Renovated 1968  
Year(s) Acquired 2013  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Prudential Center    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Prudential Center  
Type Office  
Location Boston, MA  
Encumbrances $ 0  
Original Land 92,077  
Original Building 948,357  
Costs Capitalized Subsequent to Acquisition 472,432  
Land and improvements 100,540  
Buildings and Improvements 1,412,222  
Land Held for Development 104  
Development and Construction in Progress 0  
Total 1,512,866  
Accumulated Depreciation $ 535,305  
Year(s) Built / Renovated 1965/1993/2002/2016-2017  
Year(s) Acquired 1998/1999/2000  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Embarcadero Center    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Embarcadero Center  
Type Office  
Location San Francisco, CA  
Encumbrances $ 0  
Original Land 179,697  
Original Building 847,410  
Costs Capitalized Subsequent to Acquisition 306,586  
Land and improvements 180,420  
Buildings and Improvements 1,153,273  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 1,333,693  
Accumulated Depreciation $ 597,613  
Year(s) Built / Renovated 1970/1989  
Year(s) Acquired 1998-1999  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 399 Park Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 399 Park Avenue  
Type Office  
Location New York, NY  
Encumbrances $ 0  
Original Land 339,200  
Original Building 700,358  
Costs Capitalized Subsequent to Acquisition 187,484  
Land and improvements 339,200  
Buildings and Improvements 887,842  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 1,227,042  
Accumulated Depreciation $ 318,267  
Year(s) Built / Renovated 1961/2018  
Year(s) Acquired 2002  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Salesforce Tower    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Salesforce Tower  
Type Office  
Location San Francisco, CA  
Encumbrances $ 0  
Original Land 200,349  
Original Building 919,565  
Costs Capitalized Subsequent to Acquisition 0  
Land and improvements 200,349  
Buildings and Improvements 919,565  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 1,119,914  
Accumulated Depreciation $ 9,509  
Year(s) Built / Renovated 2018  
Year(s) Acquired 2013  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 601 Lexington Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 601 Lexington Avenue  
Type Office  
Location New York, NY  
Encumbrances $ 658,792  
Original Land 241,600  
Original Building 494,782  
Costs Capitalized Subsequent to Acquisition 324,899  
Land and improvements 279,281  
Buildings and Improvements 610,316  
Land Held for Development 0  
Development and Construction in Progress 171,684  
Total 1,061,281  
Accumulated Depreciation $ 264,150  
Year(s) Built / Renovated 1977/1997  
Year(s) Acquired 2001  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 200 Clarendon Street and Garage    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 200 Clarendon Street and Garage  
Type Office  
Location Boston, MA  
Encumbrances $ 0  
Original Land 219,543  
Original Building 667,884  
Costs Capitalized Subsequent to Acquisition 164,073  
Land and improvements 219,616  
Buildings and Improvements 822,218  
Land Held for Development 9,666  
Development and Construction in Progress 0  
Total 1,051,500  
Accumulated Depreciation $ 192,137  
Year(s) Built / Renovated 1976  
Year(s) Acquired 2010  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 250 West 55th Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 250 West 55th Street  
Type Office  
Location New York, NY  
Encumbrances $ 0  
Original Land 285,263  
Original Building 603,167  
Costs Capitalized Subsequent to Acquisition 48,642  
Land and improvements 285,263  
Buildings and Improvements 651,809  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 937,072  
Accumulated Depreciation $ 94,434  
Year(s) Built / Renovated 2014  
Year(s) Acquired 2007  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 100 Federal Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 100 Federal Street  
Type Office  
Location Boston, MA  
Encumbrances $ 0  
Original Land 131,067  
Original Building 435,954  
Costs Capitalized Subsequent to Acquisition 99,702  
Land and improvements 131,067  
Buildings and Improvements 535,656  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 666,723  
Accumulated Depreciation $ 105,536  
Year(s) Built / Renovated 1971-1975/2017  
Year(s) Acquired 2012  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Carnegie Center    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Carnegie Center  
Type Office  
Location Princeton, NJ  
Encumbrances $ 0  
Original Land 107,997  
Original Building 389,359  
Costs Capitalized Subsequent to Acquisition 141,434  
Land and improvements 104,617  
Buildings and Improvements 530,987  
Land Held for Development 3,186  
Development and Construction in Progress 0  
Total 638,790  
Accumulated Depreciation $ 237,322  
Year(s) Built / Renovated 1983-2016  
Year(s) Acquired 1998/1999/2000/2007/2014/2017  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Times Square Tower    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Times Square Tower  
Type Office  
Location New York, NY  
Encumbrances $ 0  
Original Land 165,413  
Original Building 380,438  
Costs Capitalized Subsequent to Acquisition 56,472  
Land and improvements 159,694  
Buildings and Improvements 442,629  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 602,323  
Accumulated Depreciation $ 196,753  
Year(s) Built / Renovated 2004  
Year(s) Acquired 2000  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Atlantic Wharf    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Atlantic Wharf  
Type Office  
Location Boston, MA  
Encumbrances $ 0  
Original Land 63,988  
Original Building 454,537  
Costs Capitalized Subsequent to Acquisition 17,184  
Land and improvements 63,988  
Buildings and Improvements 471,721  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 535,709  
Accumulated Depreciation $ 116,238  
Year(s) Built / Renovated 2011  
Year(s) Acquired 2007  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 510 Madison Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 510 Madison Avenue  
Type Office  
Location New York, NY  
Encumbrances $ 0  
Original Land 103,000  
Original Building 253,665  
Costs Capitalized Subsequent to Acquisition 24,992  
Land and improvements 103,000  
Buildings and Improvements 278,657  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 381,657  
Accumulated Depreciation $ 62,507  
Year(s) Built / Renovated 2012  
Year(s) Acquired 2010  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Fountain Square    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Fountain Square  
Type Office  
Location Reston, VA  
Encumbrances $ 0  
Original Land 56,853  
Original Building 306,298  
Costs Capitalized Subsequent to Acquisition 3,170  
Land and improvements 56,853  
Buildings and Improvements 309,468  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 366,321  
Accumulated Depreciation $ 68,390  
Year(s) Built / Renovated 1986-1990  
Year(s) Acquired 2012  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 599 Lexington Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 599 Lexington Avenue  
Type Office  
Location New York, NY  
Encumbrances $ 0  
Original Land 81,040  
Original Building 100,507  
Costs Capitalized Subsequent to Acquisition 146,971  
Land and improvements 81,040  
Buildings and Improvements 247,478  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 328,518  
Accumulated Depreciation $ 164,002  
Year(s) Built / Renovated 1986  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 680 Folsom Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 680 Folsom Street  
Type Office  
Location San Francisco, CA  
Encumbrances $ 0  
Original Land 72,545  
Original Building 219,766  
Costs Capitalized Subsequent to Acquisition 7,829  
Land and improvements 72,545  
Buildings and Improvements 227,595  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 300,140  
Accumulated Depreciation $ 38,230  
Year(s) Built / Renovated 2014  
Year(s) Acquired 2012  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 601 Massachusetts Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 601 Massachusetts Avenue  
Type Office  
Location Washington, DC  
Encumbrances $ 0  
Original Land 95,310  
Original Building 165,173  
Costs Capitalized Subsequent to Acquisition 3,888  
Land and improvements 95,310  
Buildings and Improvements 169,061  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 264,371  
Accumulated Depreciation $ 18,263  
Year(s) Built / Renovated 2016  
Year(s) Acquired 2008  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | South of Market and Democracy Tower    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name South of Market and Democracy Tower  
Type Office  
Location Reston, VA  
Encumbrances $ 0  
Original Land 13,603  
Original Building 237,479  
Costs Capitalized Subsequent to Acquisition 12,092  
Land and improvements 13,603  
Buildings and Improvements 249,571  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 263,174  
Accumulated Depreciation $ 91,006  
Year(s) Built / Renovated 2008-2009  
Year(s) Acquired 2003  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Bay Colony Corporate Center    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Bay Colony Corporate Center  
Type Office  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 18,789  
Original Building 148,451  
Costs Capitalized Subsequent to Acquisition 77,133  
Land and improvements 18,789  
Buildings and Improvements 225,584  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 244,373  
Accumulated Depreciation $ 68,903  
Year(s) Built / Renovated 1985-1989  
Year(s) Acquired 2011  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Gateway Center    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Gateway Center  
Type Office  
Location San Francisco, CA  
Encumbrances $ 0  
Original Land 28,255  
Original Building 139,245  
Costs Capitalized Subsequent to Acquisition 58,442  
Land and improvements 29,029  
Buildings and Improvements 196,913  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 225,942  
Accumulated Depreciation $ 106,074  
Year(s) Built / Renovated 1984/1986/2002  
Year(s) Acquired 1999  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 535 Mission Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 535 Mission Street  
Type Office  
Location San Francisco, CA  
Encumbrances $ 0  
Original Land 40,933  
Original Building 148,378  
Costs Capitalized Subsequent to Acquisition 3,259  
Land and improvements 40,933  
Buildings and Improvements 151,637  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 192,570  
Accumulated Depreciation $ 20,576  
Year(s) Built / Renovated 2015  
Year(s) Acquired 2013  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 2200 Pennsylvania Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 2200 Pennsylvania Avenue  
Type Office  
Location Washington, DC  
Encumbrances $ 0  
Original Land 0  
Original Building 183,541  
Costs Capitalized Subsequent to Acquisition 4,535  
Land and improvements 0  
Buildings and Improvements 188,076  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 188,076  
Accumulated Depreciation $ 52,280  
Year(s) Built / Renovated 2011  
Year(s) Acquired 2008  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Mountain View Research Park    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Mountain View Research Park  
Type Office  
Location Mountain View, CA  
Encumbrances $ 0  
Original Land 95,066  
Original Building 68,373  
Costs Capitalized Subsequent to Acquisition 9,988  
Land and improvements 95,066  
Buildings and Improvements 78,361  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 173,427  
Accumulated Depreciation $ 17,866  
Year(s) Built / Renovated 1977-1981/2007-2013  
Year(s) Acquired 2013  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Reservoir Place    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Reservoir Place  
Type Office  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 18,605  
Original Building 104,124  
Costs Capitalized Subsequent to Acquisition 41,069  
Land and improvements 19,089  
Buildings and Improvements 144,709  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 163,798  
Accumulated Depreciation $ 63,684  
Year(s) Built / Renovated 1955/1987/2017  
Year(s) Acquired 1997/1998  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 1330 Connecticut Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 1330 Connecticut Avenue  
Type Office  
Location Washington, DC  
Encumbrances $ 0  
Original Land 25,982  
Original Building 82,311  
Costs Capitalized Subsequent to Acquisition 31,476  
Land and improvements 25,982  
Buildings and Improvements 113,787  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 139,769  
Accumulated Depreciation $ 26,400  
Year(s) Built / Renovated 1984/2018  
Year(s) Acquired 2004  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Kingstowne Towne Center    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Kingstowne Towne Center  
Type Office  
Location Alexandria, VA  
Encumbrances $ 0  
Original Land 18,021  
Original Building 109,038  
Costs Capitalized Subsequent to Acquisition 1,934  
Land and improvements 18,021  
Buildings and Improvements 110,972  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 128,993  
Accumulated Depreciation $ 41,436  
Year(s) Built / Renovated 2003-2006  
Year(s) Acquired 2007  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | One Freedom Square    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name One Freedom Square  
Type Office  
Location Reston, VA  
Encumbrances $ 0  
Original Land 9,929  
Original Building 84,504  
Costs Capitalized Subsequent to Acquisition 26,619  
Land and improvements 9,883  
Buildings and Improvements 111,169  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 121,052  
Accumulated Depreciation $ 53,268  
Year(s) Built / Renovated 2000  
Year(s) Acquired 2003  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Weston Corporate Center    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Weston Corporate Center  
Type Office  
Location Weston, MA  
Encumbrances $ 0  
Original Land 25,753  
Original Building 92,312  
Costs Capitalized Subsequent to Acquisition (123)  
Land and improvements 25,854  
Buildings and Improvements 92,088  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 117,942  
Accumulated Depreciation $ 26,176  
Year(s) Built / Renovated 2010  
Year(s) Acquired 2001  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Capital Gallery    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Capital Gallery  
Type Office  
Location Washington, DC  
Encumbrances $ 0  
Original Land 4,725  
Original Building 29,565  
Costs Capitalized Subsequent to Acquisition 77,100  
Land and improvements 6,128  
Buildings and Improvements 105,262  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 111,390  
Accumulated Depreciation $ 65,272  
Year(s) Built / Renovated 1981/2006  
Year(s) Acquired 2007  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Two Freedom Square    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Two Freedom Square  
Type Office  
Location Reston, VA  
Encumbrances $ 0  
Original Land 13,930  
Original Building 77,739  
Costs Capitalized Subsequent to Acquisition 17,215  
Land and improvements 13,866  
Buildings and Improvements 95,018  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 108,884  
Accumulated Depreciation $ 49,768  
Year(s) Built / Renovated 2001  
Year(s) Acquired 2003  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | One and Two Reston Overlook    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name One and Two Reston Overlook  
Type Office  
Location Reston, VA  
Encumbrances $ 0  
Original Land 16,456  
Original Building 66,192  
Costs Capitalized Subsequent to Acquisition 19,763  
Land and improvements 15,074  
Buildings and Improvements 87,337  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 102,411  
Accumulated Depreciation $ 46,584  
Year(s) Built / Renovated 1999  
Year(s) Acquired 2000  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 140 Kendrick Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 140 Kendrick Street  
Type Office  
Location Needham, MA  
Encumbrances $ 0  
Original Land 18,095  
Original Building 66,905  
Costs Capitalized Subsequent to Acquisition 13,563  
Land and improvements 18,095  
Buildings and Improvements 80,468  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 98,563  
Accumulated Depreciation $ 31,381  
Year(s) Built / Renovated 2000  
Year(s) Acquired 2004  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 355 Main Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 355 Main Street  
Type Office  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 18,863  
Original Building 53,346  
Costs Capitalized Subsequent to Acquisition 23,403  
Land and improvements 21,098  
Buildings and Improvements 74,514  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 95,612  
Accumulated Depreciation $ 23,620  
Year(s) Built / Renovated 1981/1996/2013  
Year(s) Acquired 2006  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Discovery Square    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Discovery Square  
Type Office  
Location Reston, VA  
Encumbrances $ 0  
Original Land 11,198  
Original Building 71,782  
Costs Capitalized Subsequent to Acquisition 12,208  
Land and improvements 11,146  
Buildings and Improvements 84,042  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 95,188  
Accumulated Depreciation $ 38,212  
Year(s) Built / Renovated 2001  
Year(s) Acquired 2003  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 10 CityPoint    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 10 CityPoint  
Type Office  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 1,953  
Original Building 85,752  
Costs Capitalized Subsequent to Acquisition 4,352  
Land and improvements 1,953  
Buildings and Improvements 90,104  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 92,057  
Accumulated Depreciation $ 7,772  
Year(s) Built / Renovated 2016  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 90 Broadway    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 90 Broadway  
Type Office  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 19,104  
Original Building 52,078  
Costs Capitalized Subsequent to Acquisition 18,184  
Land and improvements 20,741  
Buildings and Improvements 68,625  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 89,366  
Accumulated Depreciation $ 21,265  
Year(s) Built / Renovated 1983/1998/2013  
Year(s) Acquired 2006  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 230 CityPoint    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 230 CityPoint  
Type Office  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 13,189  
Original Building 49,823  
Costs Capitalized Subsequent to Acquisition 20,297  
Land and improvements 13,189  
Buildings and Improvements 70,120  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 83,309  
Accumulated Depreciation $ 25,964  
Year(s) Built / Renovated 1992  
Year(s) Acquired 2005  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 77 CityPoint    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 77 CityPoint  
Type Office  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 13,847  
Original Building 60,383  
Costs Capitalized Subsequent to Acquisition 5,753  
Land and improvements 13,847  
Buildings and Improvements 66,136  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 79,983  
Accumulated Depreciation $ 25,085  
Year(s) Built / Renovated 2008  
Year(s) Acquired 2001  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Waltham Weston Corporate Center    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Waltham Weston Corporate Center  
Type Office  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 10,385  
Original Building 60,694  
Costs Capitalized Subsequent to Acquisition 8,462  
Land and improvements 10,350  
Buildings and Improvements 69,191  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 79,541  
Accumulated Depreciation $ 32,005  
Year(s) Built / Renovated 2003  
Year(s) Acquired 1999  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 3625-3635 Peterson Way    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 3625-3635 Peterson Way  
Type Office  
Location Santa Clara, CA  
Encumbrances $ 0  
Original Land 63,206  
Original Building 14,879  
Costs Capitalized Subsequent to Acquisition 673  
Land and improvements 63,206  
Buildings and Improvements 14,879  
Land Held for Development 673  
Development and Construction in Progress 0  
Total 78,758  
Accumulated Depreciation $ 8,146  
Year(s) Built / Renovated 1979  
Year(s) Acquired 2016  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 2440 West El Camino Real    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 2440 West El Camino Real  
Type Office  
Location Mountain View, CA  
Encumbrances $ 0  
Original Land 16,741  
Original Building 51,285  
Costs Capitalized Subsequent to Acquisition 3,411  
Land and improvements 16,741  
Buildings and Improvements 54,696  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 71,437  
Accumulated Depreciation $ 12,562  
Year(s) Built / Renovated 1987/2003  
Year(s) Acquired 2011  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 300 Binney Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 300 Binney Street  
Type Office  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 18,080  
Original Building 51,262  
Costs Capitalized Subsequent to Acquisition 140  
Land and improvements 18,080  
Buildings and Improvements 51,402  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 69,482  
Accumulated Depreciation $ 9,450  
Year(s) Built / Renovated 2013  
Year(s) Acquired 2009  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Wisconsin Place    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Wisconsin Place  
Type Office  
Location Chevy Chase, MD  
Encumbrances $ 0  
Original Land 0  
Original Building 53,349  
Costs Capitalized Subsequent to Acquisition 14,889  
Land and improvements 0  
Buildings and Improvements 68,238  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 68,238  
Accumulated Depreciation $ 22,936  
Year(s) Built / Renovated 2009  
Year(s) Acquired 2004  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 191 Spring Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 191 Spring Street  
Type Office  
Location Lexington, MA  
Encumbrances $ 0  
Original Land 2,850  
Original Building 59,751  
Costs Capitalized Subsequent to Acquisition 5,603  
Land and improvements 2,850  
Buildings and Improvements 65,354  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 68,204  
Accumulated Depreciation $ 19,435  
Year(s) Built / Renovated 1971/1995/2018  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] (1)  
Boston Properties Limited Partnership | Reston Corporate Center    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Reston Corporate Center  
Type Office  
Location Reston, VA  
Encumbrances $ 0  
Original Land 9,135  
Original Building 50,857  
Costs Capitalized Subsequent to Acquisition 3,625  
Land and improvements 9,496  
Buildings and Improvements 54,121  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 63,617  
Accumulated Depreciation $ 27,674  
Year(s) Built / Renovated 1984  
Year(s) Acquired 1998  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | New Dominion Technology Park, Bldg. Two    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name New Dominion Technology Park, Bldg. Two  
Type Office  
Location Herndon, VA  
Encumbrances $ 0  
Original Land 5,584  
Original Building 51,868  
Costs Capitalized Subsequent to Acquisition 412  
Land and improvements 5,574  
Buildings and Improvements 52,290  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 57,864  
Accumulated Depreciation $ 24,498  
Year(s) Built / Renovated 2004  
Year(s) Acquired 1998  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 255 Main Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 255 Main Street  
Type Office  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 134  
Original Building 25,110  
Costs Capitalized Subsequent to Acquisition 28,016  
Land and improvements 134  
Buildings and Improvements 53,126  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 53,260  
Accumulated Depreciation $ 29,776  
Year(s) Built / Renovated 1987  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 200 West Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 200 West Street  
Type Office  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 16,148  
Original Building 24,983  
Costs Capitalized Subsequent to Acquisition 8,459  
Land and improvements 16,148  
Buildings and Improvements 33,442  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 49,590  
Accumulated Depreciation $ 21,891  
Year(s) Built / Renovated 1999  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | New Dominion Technology Park, Bldg. One    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name New Dominion Technology Park, Bldg. One  
Type Office  
Location Herndon, VA  
Encumbrances $ 29,675  
Original Land 3,880  
Original Building 43,227  
Costs Capitalized Subsequent to Acquisition 1,117  
Land and improvements 3,880  
Buildings and Improvements 44,344  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 48,224  
Accumulated Depreciation $ 26,852  
Year(s) Built / Renovated 2001  
Year(s) Acquired 1998  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Sumner Square    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Sumner Square  
Type Office  
Location Washington, DC  
Encumbrances $ 0  
Original Land 624  
Original Building 28,745  
Costs Capitalized Subsequent to Acquisition 16,974  
Land and improvements 958  
Buildings and Improvements 45,385  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 46,343  
Accumulated Depreciation $ 24,877  
Year(s) Built / Renovated 1985  
Year(s) Acquired 1999  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | University Place    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name University Place  
Type Office  
Location Cambridge, MA  
Encumbrances $ 5,571  
Original Land 0  
Original Building 37,091  
Costs Capitalized Subsequent to Acquisition 7,551  
Land and improvements 27  
Buildings and Improvements 44,615  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 44,642  
Accumulated Depreciation $ 27,519  
Year(s) Built / Renovated 1985  
Year(s) Acquired 1998  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 2600 Tower Oaks Boulevard    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 2600 Tower Oaks Boulevard  
Type Office  
Location Rockville, MD  
Encumbrances $ 0  
Original Land 4,243  
Original Building 31,125  
Costs Capitalized Subsequent to Acquisition 6,517  
Land and improvements 4,244  
Buildings and Improvements 37,641  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 41,885  
Accumulated Depreciation $ 21,426  
Year(s) Built / Renovated 2001  
Year(s) Acquired 1998  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | North First Business Park    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name North First Business Park  
Type Office  
Location San Jose, CA  
Encumbrances $ 0  
Original Land 23,398  
Original Building 13,069  
Costs Capitalized Subsequent to Acquisition 4,590  
Land and improvements 23,371  
Buildings and Improvements 17,686  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 41,057  
Accumulated Depreciation $ 16,076  
Year(s) Built / Renovated 1981  
Year(s) Acquired 2007  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 150 Broadway    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 150 Broadway  
Type Office  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 850  
Original Building 25,042  
Costs Capitalized Subsequent to Acquisition 6,535  
Land and improvements 822  
Buildings and Improvements 31,605  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 32,427  
Accumulated Depreciation $ 17,909  
Year(s) Built / Renovated 1999  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 325 Main Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 325 Main Street  
Type Office  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 174  
Original Building 12,200  
Costs Capitalized Subsequent to Acquisition 15,666  
Land and improvements 772  
Buildings and Improvements 22,741  
Land Held for Development 4,527  
Development and Construction in Progress 0  
Total 28,040  
Accumulated Depreciation $ 13,484  
Year(s) Built / Renovated 1987/2013  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 105 Broadway    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 105 Broadway  
Type Office  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 1,299  
Original Building 12,943  
Costs Capitalized Subsequent to Acquisition 7,295  
Land and improvements 1,868  
Buildings and Improvements 19,669  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 21,537  
Accumulated Depreciation $ 13,432  
Year(s) Built / Renovated 1990  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Lexington Office Park    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Lexington Office Park  
Type Office  
Location Lexington, MA  
Encumbrances $ 0  
Original Land 998  
Original Building 1,426  
Costs Capitalized Subsequent to Acquisition 17,936  
Land and improvements 1,073  
Buildings and Improvements 19,287  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 20,360  
Accumulated Depreciation $ 13,430  
Year(s) Built / Renovated 1982  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 201 Spring Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 201 Spring Street  
Type Office  
Location Lexington, MA  
Encumbrances $ 0  
Original Land 2,849  
Original Building 15,303  
Costs Capitalized Subsequent to Acquisition 291  
Land and improvements 2,849  
Buildings and Improvements 15,594  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 18,443  
Accumulated Depreciation $ 8,073  
Year(s) Built / Renovated 1997  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | The Point    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name The Point  
Type Office  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 6,395  
Original Building 10,040  
Costs Capitalized Subsequent to Acquisition 431  
Land and improvements 6,480  
Buildings and Improvements 10,386  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 16,866  
Accumulated Depreciation $ 1,031  
Year(s) Built / Renovated 2015  
Year(s) Acquired 2007  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 690 Folsom Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 690 Folsom Street  
Type Office  
Location San Francisco, CA  
Encumbrances $ 0  
Original Land 3,219  
Original Building 11,038  
Costs Capitalized Subsequent to Acquisition 1,157  
Land and improvements 3,219  
Buildings and Improvements 12,195  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 15,414  
Accumulated Depreciation $ 1,790  
Year(s) Built / Renovated 2015  
Year(s) Acquired 2012  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 92-100 Hayden Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 92-100 Hayden Avenue  
Type Office  
Location Lexington, MA  
Encumbrances $ 0  
Original Land 594  
Original Building 6,748  
Costs Capitalized Subsequent to Acquisition 6,526  
Land and improvements 619  
Buildings and Improvements 13,249  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 13,868  
Accumulated Depreciation $ 11,629  
Year(s) Built / Renovated 1985  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 181 Spring Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 181 Spring Street  
Type Office  
Location Lexington, MA  
Encumbrances $ 0  
Original Land 1,066  
Original Building 9,520  
Costs Capitalized Subsequent to Acquisition 1,853  
Land and improvements 1,066  
Buildings and Improvements 11,373  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 12,439  
Accumulated Depreciation $ 5,332  
Year(s) Built / Renovated 1999  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 195 West Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 195 West Street  
Type Office  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 1,611  
Original Building 6,652  
Costs Capitalized Subsequent to Acquisition 3,281  
Land and improvements 1,611  
Buildings and Improvements 9,933  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 11,544  
Accumulated Depreciation $ 8,084  
Year(s) Built / Renovated 1990  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 33 Hayden Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 33 Hayden Avenue  
Type Office  
Location Lexington, MA  
Encumbrances $ 0  
Original Land 266  
Original Building 3,234  
Costs Capitalized Subsequent to Acquisition 7,586  
Land and improvements 266  
Buildings and Improvements 10,820  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 11,086  
Accumulated Depreciation $ 8,877  
Year(s) Built / Renovated 1979  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 7501 Boston Boulevard, Building Seven    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 7501 Boston Boulevard, Building Seven  
Type Office  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 665  
Original Building 9,273  
Costs Capitalized Subsequent to Acquisition 314  
Land and improvements 665  
Buildings and Improvements 9,587  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 10,252  
Accumulated Depreciation $ 4,995  
Year(s) Built / Renovated 1997  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 7450 Boston Boulevard, Building Three    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 7450 Boston Boulevard, Building Three  
Type Office  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 1,165  
Original Building 4,681  
Costs Capitalized Subsequent to Acquisition 2,864  
Land and improvements 1,327  
Buildings and Improvements 7,383  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 8,710  
Accumulated Depreciation $ 3,628  
Year(s) Built / Renovated 1987  
Year(s) Acquired 1998  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 7435 Boston Boulevard, Building One    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 7435 Boston Boulevard, Building One  
Type Office  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 392  
Original Building 3,822  
Costs Capitalized Subsequent to Acquisition 4,044  
Land and improvements 486  
Buildings and Improvements 7,772  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 8,258  
Accumulated Depreciation $ 5,748  
Year(s) Built / Renovated 1982  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 8000 Grainger Court, Building Five    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 8000 Grainger Court, Building Five  
Type Office  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 366  
Original Building 4,282  
Costs Capitalized Subsequent to Acquisition 2,942  
Land and improvements 453  
Buildings and Improvements 7,137  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 7,590  
Accumulated Depreciation $ 5,720  
Year(s) Built / Renovated 1984  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 250 Binney Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 250 Binney Street  
Type Office  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 110  
Original Building 4,483  
Costs Capitalized Subsequent to Acquisition 2,939  
Land and improvements 110  
Buildings and Improvements 7,422  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 7,532  
Accumulated Depreciation $ 5,291  
Year(s) Built / Renovated 1983  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 453 Ravendale Drive    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 453 Ravendale Drive  
Type Office  
Location Mountain View, CA  
Encumbrances $ 0  
Original Land 5,477  
Original Building 1,090  
Costs Capitalized Subsequent to Acquisition 676  
Land and improvements 5,477  
Buildings and Improvements 1,766  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 7,243  
Accumulated Depreciation $ 558  
Year(s) Built / Renovated 1977  
Year(s) Acquired 2012  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 7300 Boston Boulevard, Building Thirteen    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 7300 Boston Boulevard, Building Thirteen  
Type Office  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 608  
Original Building 4,773  
Costs Capitalized Subsequent to Acquisition 1,226  
Land and improvements 608  
Buildings and Improvements 5,999  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 6,607  
Accumulated Depreciation $ 2,959  
Year(s) Built / Renovated 2002  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 17 Hartwell Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 17 Hartwell Avenue  
Type Office  
Location Lexington, MA  
Encumbrances $ 0  
Original Land 26  
Original Building 150  
Costs Capitalized Subsequent to Acquisition 5,907  
Land and improvements 26  
Buildings and Improvements 6,057  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 6,083  
Accumulated Depreciation $ 1,406  
Year(s) Built / Renovated 1968  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 7601 Boston Boulevard, Building Eight    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 7601 Boston Boulevard, Building Eight  
Type Office  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 200  
Original Building 878  
Costs Capitalized Subsequent to Acquisition 4,680  
Land and improvements 378  
Buildings and Improvements 5,380  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 5,758  
Accumulated Depreciation $ 4,318  
Year(s) Built / Renovated 1986  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 7500 Boston Boulevard, Building Six    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 7500 Boston Boulevard, Building Six  
Type Office  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 138  
Original Building 3,749  
Costs Capitalized Subsequent to Acquisition 1,140  
Land and improvements 273  
Buildings and Improvements 4,754  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 5,027  
Accumulated Depreciation $ 3,991  
Year(s) Built / Renovated 1985  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 8000 Corporate Court, Building Eleven    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 8000 Corporate Court, Building Eleven  
Type Office  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 136  
Original Building 3,071  
Costs Capitalized Subsequent to Acquisition 1,245  
Land and improvements 686  
Buildings and Improvements 3,766  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 4,452  
Accumulated Depreciation $ 2,961  
Year(s) Built / Renovated 1989  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 7375 Boston Boulevard, Building Ten    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 7375 Boston Boulevard, Building Ten  
Type Office  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 23  
Original Building 2,685  
Costs Capitalized Subsequent to Acquisition 811  
Land and improvements 47  
Buildings and Improvements 3,472  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 3,519  
Accumulated Depreciation $ 2,552  
Year(s) Built / Renovated 1988  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 7374 Boston Boulevard, Building Four    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 7374 Boston Boulevard, Building Four  
Type Office  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 241  
Original Building 1,605  
Costs Capitalized Subsequent to Acquisition 1,445  
Land and improvements 303  
Buildings and Improvements 2,988  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 3,291  
Accumulated Depreciation $ 2,594  
Year(s) Built / Renovated 1984  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 7451 Boston Boulevard, Building Two    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 7451 Boston Boulevard, Building Two  
Type Office  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 249  
Original Building 1,542  
Costs Capitalized Subsequent to Acquisition 1,346  
Land and improvements 535  
Buildings and Improvements 2,602  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 3,137  
Accumulated Depreciation $ 2,449  
Year(s) Built / Renovated 1982  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 32 Hartwell Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 32 Hartwell Avenue  
Type Office  
Location Lexington, MA  
Encumbrances $ 0  
Original Land 168  
Original Building 1,943  
Costs Capitalized Subsequent to Acquisition 231  
Land and improvements 168  
Buildings and Improvements 2,174  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 2,342  
Accumulated Depreciation $ 1,676  
Year(s) Built / Renovated 1968/1979/1987  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 164 Lexington Road    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 164 Lexington Road  
Type Office  
Location Billerica, MA  
Encumbrances $ 0  
Original Land 592  
Original Building 1,370  
Costs Capitalized Subsequent to Acquisition 117  
Land and improvements 592  
Buildings and Improvements 1,487  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 2,079  
Accumulated Depreciation $ 853  
Year(s) Built / Renovated 1982  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Signature at Reston    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Signature at Reston  
Type Residential  
Location Reston, VA  
Encumbrances $ 0  
Original Land 27,076  
Original Building 190,580  
Costs Capitalized Subsequent to Acquisition 0  
Land and improvements 27,076  
Buildings and Improvements 190,580  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 217,656  
Accumulated Depreciation $ 3,938  
Year(s) Built / Renovated 2018  
Year(s) Acquired 2013  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Proto Kendall Square    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Proto Kendall Square  
Type Residential  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 9,243  
Original Building 127,248  
Costs Capitalized Subsequent to Acquisition 0  
Land and improvements 9,243  
Buildings and Improvements 127,248  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 136,491  
Accumulated Depreciation $ 1,324  
Year(s) Built / Renovated 2018  
Year(s) Acquired 2015  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | The Avant at Reston Town Center    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name The Avant at Reston Town Center  
Type Residential  
Location Reston, VA  
Encumbrances $ 0  
Original Land 20,350  
Original Building 91,995  
Costs Capitalized Subsequent to Acquisition 830  
Land and improvements 20,350  
Buildings and Improvements 92,825  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 113,175  
Accumulated Depreciation $ 12,254  
Year(s) Built / Renovated 2014  
Year(s) Acquired 2010  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | The Lofts at Atlantic Wharf    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name The Lofts at Atlantic Wharf  
Type Residential  
Location Boston, MA  
Encumbrances $ 0  
Original Land 3,529  
Original Building 54,891  
Costs Capitalized Subsequent to Acquisition 1,768  
Land and improvements 3,529  
Buildings and Improvements 56,659  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 60,188  
Accumulated Depreciation $ 11,131  
Year(s) Built / Renovated 2011  
Year(s) Acquired 2007  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Boston Marriott Cambridge    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Boston Marriott Cambridge  
Type Hotel  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 478  
Original Building 37,918  
Costs Capitalized Subsequent to Acquisition 33,806  
Land and improvements 478  
Buildings and Improvements 71,724  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 72,202  
Accumulated Depreciation $ 45,868  
Year(s) Built / Renovated 1986/2017  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Kendall Center Green Garage    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Kendall Center Green Garage  
Type Garage  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 0  
Original Building 35,035  
Costs Capitalized Subsequent to Acquisition 7,034  
Land and improvements 0  
Buildings and Improvements 42,069  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 42,069  
Accumulated Depreciation $ 12,108  
Year(s) Built / Renovated 1984  
Year(s) Acquired 2006  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Kendall Center Yellow Garage    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Kendall Center Yellow Garage  
Type Garage  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 1,256  
Original Building 15,697  
Costs Capitalized Subsequent to Acquisition 909  
Land and improvements 1,256  
Buildings and Improvements 16,606  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 17,862  
Accumulated Depreciation $ 5,472  
Year(s) Built / Renovated 2006  
Year(s) Acquired 2004  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | Kendall Center Blue Garage    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Kendall Center Blue Garage  
Type Garage  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 1,163  
Original Building 11,633  
Costs Capitalized Subsequent to Acquisition 480  
Land and improvements 1,163  
Buildings and Improvements 12,113  
Land Held for Development 0  
Development and Construction in Progress 0  
Total 13,276  
Accumulated Depreciation $ 9,030  
Year(s) Built / Renovated 1990  
Year(s) Acquired 1997  
Depreciable Lives (Years) [6] -1  
Boston Properties Limited Partnership | 145 Broadway    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 145 Broadway  
Type Development  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 121  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 223,642  
Land and improvements 121  
Buildings and Improvements 0  
Land Held for Development 0  
Development and Construction in Progress 223,642  
Total 223,763  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 1997  
Depreciable Lives (Years) N/A  
Boston Properties Limited Partnership | MacArthur Station Residences    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name MacArthur Station Residences  
Type Development  
Location Oakland, CA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 87,159  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 0  
Development and Construction in Progress 87,159  
Total 87,159  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired N/A  
Depreciable Lives (Years) N/A  
Boston Properties Limited Partnership | 20 CityPoint    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 20 CityPoint  
Type Development  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 0  
Original Building 6,287  
Costs Capitalized Subsequent to Acquisition 46,024  
Land and improvements 0  
Buildings and Improvements 6,287  
Land Held for Development 0  
Development and Construction in Progress 46,024  
Total 52,311  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 2007  
Depreciable Lives (Years) N/A  
Boston Properties Limited Partnership | Reston Gateway    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Reston Gateway  
Type Development  
Location Reston, VA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 25,167  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 0  
Development and Construction in Progress 25,167  
Total 25,167  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 1998  
Depreciable Lives (Years) N/A  
Boston Properties Limited Partnership | 17Fifty Presidents Street    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 17Fifty Presidents Street  
Type Development  
Location Reston, VA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 25,120  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 0  
Development and Construction in Progress 25,120  
Total 25,120  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 2013  
Depreciable Lives (Years) N/A  
Boston Properties Limited Partnership | North First Master Plan    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name North First Master Plan  
Type Land  
Location San Jose, CA  
Encumbrances $ 0  
Original Land 35,004  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 3,932  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 38,936  
Development and Construction in Progress 0  
Total 38,936  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 2007  
Depreciable Lives (Years) N/A  
Boston Properties Limited Partnership | Plaza at Almaden    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Plaza at Almaden  
Type Land  
Location San Jose, CA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 29,928  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 29,928  
Development and Construction in Progress 0  
Total 29,928  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 2006  
Depreciable Lives (Years) N/A  
Boston Properties Limited Partnership | Springfield Metro Center    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Springfield Metro Center  
Type Land  
Location Springfield, VA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 19,823  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 19,823  
Development and Construction in Progress 0  
Total 19,823  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 2007  
Depreciable Lives (Years) N/A  
Boston Properties Limited Partnership | 214 Third Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 214 Third Avenue  
Type Land  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 15,233  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 15,233  
Development and Construction in Progress 0  
Total 15,233  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 2006  
Depreciable Lives (Years) N/A  
Boston Properties Limited Partnership | Platform 16    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Platform 16  
Type Land  
Location San Jose, CA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 12,962  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 12,962  
Development and Construction in Progress 0  
Total 12,962  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 2018  
Depreciable Lives (Years) N/A  
Boston Properties Limited Partnership | 103 Fourth Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 103 Fourth Avenue  
Type Land  
Location Waltham, MA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 12,208  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 12,208  
Development and Construction in Progress 0  
Total 12,208  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 2007  
Depreciable Lives (Years) N/A  
Boston Properties Limited Partnership | Reston Gateway Master Plan    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Reston Gateway Master Plan  
Type Land  
Location Reston, VA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 11,014  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 11,014  
Development and Construction in Progress 0  
Total 11,014  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 1998  
Depreciable Lives (Years) N/A  
Boston Properties Limited Partnership | Fourth and Harrison    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Fourth and Harrison  
Type Land  
Location San Francisco, CA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 10,350  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 10,350  
Development and Construction in Progress 0  
Total 10,350  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired N/A  
Depreciable Lives (Years) N/A  
Boston Properties Limited Partnership | 2100 Pennsylvania Avenue    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name 2100 Pennsylvania Avenue  
Type Land  
Location Washington, DC  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 9,700  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 9,700  
Development and Construction in Progress 0  
Total 9,700  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired N/A  
Depreciable Lives (Years) N/A  
Boston Properties Limited Partnership | Crane Meadow    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Crane Meadow  
Type Land  
Location Marlborough, MA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 8,852  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 8,852  
Development and Construction in Progress 0  
Total 8,852  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 2000  
Depreciable Lives (Years) N/A  
Boston Properties Limited Partnership | Washingtonian North    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Washingtonian North  
Type Land  
Location Gaithersburg, MD  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 7,473  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 7,473  
Development and Construction in Progress 0  
Total 7,473  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 1998  
Depreciable Lives (Years) N/A  
Boston Properties Limited Partnership | Broad Run Business Park    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Broad Run Business Park  
Type Land  
Location Loudoun County, VA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 2,388  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 2,388  
Development and Construction in Progress 0  
Total 2,388  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 1998  
Depreciable Lives (Years) N/A  
Boston Properties Limited Partnership | Kendall Center Master Plan    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Kendall Center Master Plan  
Type Land  
Location Cambridge, MA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 2,199  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 2,199  
Development and Construction in Progress 0  
Total 2,199  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 1997  
Depreciable Lives (Years) N/A  
Boston Properties Limited Partnership | Weston Quarry    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Weston Quarry  
Type Land  
Location Weston, MA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 1,237  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 1,237  
Development and Construction in Progress 0  
Total 1,237  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 2001  
Depreciable Lives (Years) N/A  
Boston Properties Limited Partnership | Reston Overlook Master Plan    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Property Name Reston Overlook Master Plan  
Type Land  
Location Reston, VA  
Encumbrances $ 0  
Original Land 0  
Original Building 0  
Costs Capitalized Subsequent to Acquisition 39  
Land and improvements 0  
Buildings and Improvements 0  
Land Held for Development 39  
Development and Construction in Progress 0  
Total 39  
Accumulated Depreciation $ 0  
Year(s) Built / Renovated N/A  
Year(s) Acquired 2000  
Depreciable Lives (Years) N/A  
Minimum [Member]    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Life Used for Depreciation life of the lease  
Minimum [Member] | Boston Properties Limited Partnership    
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]    
Life Used for Depreciation life of the lease  
[1] Includes unamortized deferred financing costs totaling approximately $(30.8) million.
[2] Includes pre-development costs.
[3] Depreciation of the buildings and improvements are calculated over lives ranging from the life of the lease to 40 years.
[4] Includes unamortized deferred financing costs totaling approximately $(30.8) million.
[5] Includes pre-development costs.
[6] Depreciation of the buildings and improvements are calculated over lives ranging from the life of the lease to 40 years.