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Schedule III Properties And Accumulated Depreciation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 106,370      
Land, Initial costs 1,151,175      
Acquired ground lease, Initial costs 13,509      
Buildings and improvements, Initial costs 9,084,318      
Improvements, Costs capitalized subsequent to acquisition 6,666,934      
Carry costs, Costs capitalized subsequent to acquisition (5,900)      
Land, Total costs 1,136,341      
Acquired ground lease, Total costs 11,150      
Buildings and improvements, Total costs 15,768,445      
Total 16,915,936 $ 11,558,469 $ 10,915,373 $ 9,982,612
Accumulated depreciation and amortization $ (3,238,227) $ (2,668,509) $ (2,251,268) $ (1,874,054)
36 NE 2nd Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 36 NE 2nd Street      
Metropolitan Area Miami      
Encumbrances $ 0      
Land, Initial costs 1,942      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 24,184      
Improvements, Costs capitalized subsequent to acquisition 22,089      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,970      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 46,245      
Total 48,215      
Accumulated depreciation and amortization $ (15,363)      
2323 Bryan Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2323 Bryan Street      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 1,838      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 77,604      
Improvements, Costs capitalized subsequent to acquisition 53,297      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,838      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 130,901      
Total 132,739      
Accumulated depreciation and amortization $ (66,339)      
300 Boulevard East        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 300 Boulevard East      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 5,140      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 48,526      
Improvements, Costs capitalized subsequent to acquisition 61,913      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,140      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 110,439      
Total 115,579      
Accumulated depreciation and amortization $ (64,836)      
2334 Lundy Place        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2334 Lundy Place      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 3,607      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 23,008      
Improvements, Costs capitalized subsequent to acquisition 67      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,607      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 23,075      
Total 26,682      
Accumulated depreciation and amortization $ (10,277)      
2440 Marsh Lane        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2440 Marsh Lane      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 1,477      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 10,330      
Improvements, Costs capitalized subsequent to acquisition 73,380      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,486      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 83,701      
Total 85,187      
Accumulated depreciation and amortization $ (61,783)      
375 Riverside Parkway        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 375 Riverside Parkway      
Metropolitan Area Atlanta      
Encumbrances $ 0      
Land, Initial costs 1,250      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 11,578      
Improvements, Costs capitalized subsequent to acquisition 31,629      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,250      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 43,207      
Total 44,457      
Accumulated depreciation and amortization $ (29,212)      
4849 Alpha Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 4849 Alpha Road      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 2,983      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 10,650      
Improvements, Costs capitalized subsequent to acquisition 43,947      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,983      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 54,597      
Total 57,580      
Accumulated depreciation and amortization $ (29,230)      
600 West Seventh Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 600 West Seventh Street      
Metropolitan Area Los Angeles      
Encumbrances $ 0      
Land, Initial costs 18,478      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 50,824      
Improvements, Costs capitalized subsequent to acquisition 58,286      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 18,478      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 109,110      
Total 127,588      
Accumulated depreciation and amortization $ (64,113)      
2045 & 2055 Lafayette Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2045 & 2055 Lafayette Street      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 6,065      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 43,817      
Improvements, Costs capitalized subsequent to acquisition 15      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,065      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 43,832      
Total 49,897      
Accumulated depreciation and amortization $ (18,230)      
11830 Webb Chapel Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 11830 Webb Chapel Road      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 5,881      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 34,473      
Improvements, Costs capitalized subsequent to acquisition 2,355      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,881      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 36,828      
Total 42,709      
Accumulated depreciation and amortization $ (16,371)      
150 South First Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 150 South First Street      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 2,068      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 29,214      
Improvements, Costs capitalized subsequent to acquisition 1,499      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,068      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 30,713      
Total 32,781      
Accumulated depreciation and amortization $ (12,707)      
200 Paul Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 200 Paul Avenue      
Metropolitan Area San Francisco      
Encumbrances $ 0      
Land, Initial costs 14,427      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 75,777      
Improvements, Costs capitalized subsequent to acquisition 98,738      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 14,445      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 174,497      
Total 188,942      
Accumulated depreciation and amortization $ (79,960)      
1100 Space Park Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1100 Space Park Drive      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 5,130      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 18,206      
Improvements, Costs capitalized subsequent to acquisition 35,841      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,130      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 54,047      
Total 59,177      
Accumulated depreciation and amortization $ (31,604)      
3015 Winona Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 3015 Winona Avenue      
Metropolitan Area Los Angeles      
Encumbrances $ 0      
Land, Initial costs 6,534      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 8,356      
Improvements, Costs capitalized subsequent to acquisition 6      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,534      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 8,362      
Total 14,896      
Accumulated depreciation and amortization $ (3,643)      
1125 Energy Park Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1125 Energy Park Drive      
Metropolitan Area Minneapolis      
Encumbrances $ 0      
Land, Initial costs 2,775      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 10,761      
Improvements, Costs capitalized subsequent to acquisition (5,668)      
Carry costs, Costs capitalized subsequent to acquisition (5,900)      
Land, Total costs 2,775      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 5,093      
Total 7,868      
Accumulated depreciation and amortization $ (4,002)      
350 East Cermak Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 350 East Cermak Road      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 8,466      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 103,232      
Improvements, Costs capitalized subsequent to acquisition 269,616      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 8,620      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 372,694      
Total 381,314      
Accumulated depreciation and amortization $ (214,241)      
8534 Concord Center Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 8534 Concord Center Drive      
Metropolitan Area Denver      
Encumbrances $ 0      
Land, Initial costs 2,181      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 11,561      
Improvements, Costs capitalized subsequent to acquisition 749      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,181      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 12,310      
Total 14,491      
Accumulated depreciation and amortization $ (5,150)      
2401 Walsh Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2401 Walsh Street      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 5,775      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 19,267      
Improvements, Costs capitalized subsequent to acquisition 37      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,775      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 19,304      
Total 25,079      
Accumulated depreciation and amortization $ (8,229)      
2403 Walsh Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2403 Walsh Street      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 5,514      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 11,695      
Improvements, Costs capitalized subsequent to acquisition 48      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,514      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 11,743      
Total 17,257      
Accumulated depreciation and amortization $ (5,292)      
200 North Nash Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 200 North Nash Street      
Metropolitan Area Los Angeles      
Encumbrances $ 0      
Land, Initial costs 4,562      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 12,503      
Improvements, Costs capitalized subsequent to acquisition 232      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,562      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 12,735      
Total 17,297      
Accumulated depreciation and amortization $ (6,279)      
731 East Trade Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 731 East Trade Street      
Metropolitan Area Charlotte      
Encumbrances $ 2,370      
Land, Initial costs 1,748      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 5,727      
Improvements, Costs capitalized subsequent to acquisition 267      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,748      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 5,994      
Total 7,742      
Accumulated depreciation and amortization (2,416)      
Unamortized net premiums $ 241      
113 North Myers        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 113 North Myers      
Metropolitan Area Charlotte      
Encumbrances $ 0      
Land, Initial costs 1,098      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,127      
Improvements, Costs capitalized subsequent to acquisition 2,907      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,098      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 6,034      
Total 7,132      
Accumulated depreciation and amortization $ (2,343)      
125 North Myers        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 125 North Myers      
Metropolitan Area Charlotte      
Encumbrances $ 0      
Land, Initial costs 1,271      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,738      
Improvements, Costs capitalized subsequent to acquisition 6,329      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,271      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 10,067      
Total 11,338      
Accumulated depreciation and amortization $ (7,578)      
Paul van Vlissingenstraat 16        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Paul van Vlissingenstraat 16      
Metropolitan Area Amsterdam      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 15,255      
Improvements, Costs capitalized subsequent to acquisition 28,294      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 43,549      
Total 43,549      
Accumulated depreciation and amortization $ (18,897)      
600-780 S. Federal        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 600-780 S. Federal      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 7,849      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 27,881      
Improvements, Costs capitalized subsequent to acquisition 33,444      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,849      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 61,325      
Total 69,174      
Accumulated depreciation and amortization $ (17,051)      
115 Second Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 115 Second Avenue      
Metropolitan Area Boston      
Encumbrances $ 0      
Land, Initial costs 1,691      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 12,569      
Improvements, Costs capitalized subsequent to acquisition 11,458      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,691      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 24,027      
Total 25,718      
Accumulated depreciation and amortization $ (14,640)      
Chemin de l’Epinglier 2        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Chemin de l’Epinglier 2      
Metropolitan Area Geneva      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 20,071      
Improvements, Costs capitalized subsequent to acquisition 357      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 20,428      
Total 20,428      
Accumulated depreciation and amortization $ (8,060)      
7500 Metro Center Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 7500 Metro Center Drive      
Metropolitan Area Austin      
Encumbrances $ 0      
Land, Initial costs 1,177      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 4,877      
Improvements, Costs capitalized subsequent to acquisition 67,433      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,177      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 72,310      
Total 73,487      
Accumulated depreciation and amortization $ (10,780)      
3 Corporate Place        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 3 Corporate Place      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 1,543      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 12,678      
Improvements, Costs capitalized subsequent to acquisition 85,503      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,543      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 98,181      
Total 99,724      
Accumulated depreciation and amortization $ (81,615)      
1115 Centennial Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1115 Centennial Avenue      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 581      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 41,544      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 581      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 41,544      
Total 42,125      
Accumulated depreciation and amortization $ 0      
4025 Midway Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 4025 Midway Road      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 2,196      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 14,037      
Improvements, Costs capitalized subsequent to acquisition 29,777      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,196      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 43,814      
Total 46,010      
Accumulated depreciation and amortization $ (29,196)      
Clonshaugh Industrial Estate        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Clonshaugh Industrial Estate      
Metropolitan Area Dublin      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 1,444      
Buildings and improvements, Initial costs 5,569      
Improvements, Costs capitalized subsequent to acquisition 2,091      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 99      
Buildings and improvements, Total costs 9,005      
Total 9,104      
Accumulated depreciation and amortization $ (5,635)      
6800 Millcreek Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 6800 Millcreek Drive      
Metropolitan Area Toronto      
Encumbrances $ 0      
Land, Initial costs 1,657      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 11,352      
Improvements, Costs capitalized subsequent to acquisition 2,285      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,657      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 13,637      
Total 15,294      
Accumulated depreciation and amortization $ (6,451)      
101 Aquila Way        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 101 Aquila Way      
Metropolitan Area Atlanta      
Encumbrances $ 0      
Land, Initial costs 1,480      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 34,797      
Improvements, Costs capitalized subsequent to acquisition (14,520)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,480      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 20,277      
Total 21,757      
Accumulated depreciation and amortization $ 0      
Digital Houston        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Digital Houston      
Metropolitan Area Houston      
Encumbrances $ 0      
Land, Initial costs 6,965      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 23,492      
Improvements, Costs capitalized subsequent to acquisition 146,391      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,965      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 169,883      
Total 176,848      
Accumulated depreciation and amortization $ (58,292)      
120 E Van Buren        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 120 E Van Buren      
Metropolitan Area Phoenix      
Encumbrances $ 0      
Land, Initial costs 4,524      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 157,822      
Improvements, Costs capitalized subsequent to acquisition 118,049      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,524      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 275,871      
Total 280,395      
Accumulated depreciation and amortization $ (127,847)      
Gyroscoopweg 2E-2F        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Gyroscoopweg 2E-2F      
Metropolitan Area Amsterdam      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 13,450      
Improvements, Costs capitalized subsequent to acquisition (809)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 12,641      
Total 12,641      
Accumulated depreciation and amortization $ (5,065)      
Clonshaugh Industrial Estate II        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Clonshaugh Industrial Estate II      
Metropolitan Area Dublin      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 82,828      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 82,828      
Total 82,828      
Accumulated depreciation and amortization $ (45,139)      
600 Winter Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 600 Winter Street      
Metropolitan Area Boston      
Encumbrances $ 0      
Land, Initial costs 1,429      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 6,228      
Improvements, Costs capitalized subsequent to acquisition 456      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,429      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 6,684      
Total 8,113      
Accumulated depreciation and amortization $ (2,369)      
2300 NW 89th Place        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2300 NW 89th Place      
Metropolitan Area Miami      
Encumbrances $ 0      
Land, Initial costs 1,022      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,767      
Improvements, Costs capitalized subsequent to acquisition 19      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,022      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 3,786      
Total 4,808      
Accumulated depreciation and amortization $ (1,645)      
2055 East Technology Circle        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2055 East Technology Circle      
Metropolitan Area Phoenix      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 8,519      
Improvements, Costs capitalized subsequent to acquisition 27,727      
Carry costs, Costs capitalized subsequent to acquisition 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 36,246      
Total 36,246      
Accumulated depreciation and amortization $ (27,758)      
Unit 9, Blanchardstown Corporate Park        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Unit 9, Blanchardstown Corporate Park      
Metropolitan Area Dublin      
Encumbrances $ 0      
Land, Initial costs 1,927      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 40,024      
Improvements, Costs capitalized subsequent to acquisition 27,103      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,738      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 67,316      
Total 69,054      
Accumulated depreciation and amortization $ (23,961)      
111 8th Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 111 8th Avenue      
Metropolitan Area New York      
Encumbrances $ 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 17,688      
Improvements, Costs capitalized subsequent to acquisition 23,442      
Carry costs, Costs capitalized subsequent to acquisition 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 41,130      
Total 41,130      
Accumulated depreciation and amortization $ (29,675)      
8100 Boone Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 8100 Boone Boulevard      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 158      
Improvements, Costs capitalized subsequent to acquisition 1,272      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 1,430      
Total 1,430      
Accumulated depreciation and amortization $ (1,268)      
21110 Ridgetop Circle        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 21110 Ridgetop Circle      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 2,934      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 14,311      
Improvements, Costs capitalized subsequent to acquisition 1,307      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,934      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 15,618      
Total 18,552      
Accumulated depreciation and amortization $ (5,634)      
3011 Lafayette Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 3011 Lafayette Street      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 3,354      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 10,305      
Improvements, Costs capitalized subsequent to acquisition 50,027      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,354      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 60,332      
Total 63,686      
Accumulated depreciation and amortization $ (49,943)      
44470 Chilum Place        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 44470 Chilum Place      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 3,531      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 37,360      
Improvements, Costs capitalized subsequent to acquisition 1      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,531      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 37,361      
Total 40,892      
Accumulated depreciation and amortization $ (11,118)      
43881 Devin Shafron Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 43881 Devin Shafron Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 4,653      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 23,631      
Improvements, Costs capitalized subsequent to acquisition 94,180      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,653      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 117,811      
Total 122,464      
Accumulated depreciation and amortization $ (90,464)      
43831 Devin Shafron Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 43831 Devin Shafron Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 3,027      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 16,247      
Improvements, Costs capitalized subsequent to acquisition 1,382      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,027      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 17,629      
Total 20,656      
Accumulated depreciation and amortization $ (5,836)      
43791 Devin Shafron Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 43791 Devin Shafron Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 3,490      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 17,444      
Improvements, Costs capitalized subsequent to acquisition 77,003      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,490      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 94,447      
Total 97,937      
Accumulated depreciation and amortization $ (54,108)      
Mundells Roundabout        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Mundells Roundabout      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 31,354      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 45,616      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 21,539      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 55,431      
Total 76,970      
Accumulated depreciation and amortization $ (12,931)      
1500 Space Park Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1500 Space Park Drive      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 6,732      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 6,325      
Improvements, Costs capitalized subsequent to acquisition 46,196      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,106      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 55,147      
Total 59,253      
Accumulated depreciation and amortization $ (50,825)      
Cressex 1        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Cressex 1      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 3,629      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 9,036      
Improvements, Costs capitalized subsequent to acquisition 21,090      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,598      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 31,157      
Total 33,755      
Accumulated depreciation and amortization $ (19,656)      
Naritaweg 52        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Naritaweg 52      
Metropolitan Area Amsterdam      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 1,192      
Buildings and improvements, Initial costs 23,441      
Improvements, Costs capitalized subsequent to acquisition (4,214)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 981      
Buildings and improvements, Total costs 19,438      
Total 20,419      
Accumulated depreciation and amortization $ (5,816)      
1 St. Anne’s Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1 St. Anne’s Boulevard      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 1,490      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 1,045      
Improvements, Costs capitalized subsequent to acquisition (701)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,034      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 800      
Total 1,834      
Accumulated depreciation and amortization $ (203)      
2 St. Anne’s Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2 St. Anne’s Boulevard      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 922      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 695      
Improvements, Costs capitalized subsequent to acquisition 34,613      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 689      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 35,541      
Total 36,230      
Accumulated depreciation and amortization $ (5,860)      
3 St. Anne’s Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 3 St. Anne’s Boulevard      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 22,079      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 16,351      
Improvements, Costs capitalized subsequent to acquisition 85,898      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 15,189      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 109,139      
Total 124,328      
Accumulated depreciation and amortization $ (55,453)      
365 South Randolphville Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 365 South Randolphville Road      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 3,019      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 17,404      
Improvements, Costs capitalized subsequent to acquisition 290,404      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,019      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 307,808      
Total 310,827      
Accumulated depreciation and amortization $ (112,084)      
701 & 717 Leonard Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 701 & 717 Leonard Street      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 2,165      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 9,934      
Improvements, Costs capitalized subsequent to acquisition 835      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,165      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 10,769      
Total 12,934      
Accumulated depreciation and amortization $ (2,911)      
Manchester Technopark        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Manchester Technopark      
Metropolitan Area Manchester      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 23,918      
Improvements, Costs capitalized subsequent to acquisition (7,223)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 16,695      
Total 16,695      
Accumulated depreciation and amortization $ (4,560)      
1201 Comstock Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1201 Comstock Street      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 2,093      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 1,606      
Improvements, Costs capitalized subsequent to acquisition 26,841      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,398      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 27,142      
Total 30,540      
Accumulated depreciation and amortization $ (18,365)      
1550 Space Park Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1550 Space Park Drive      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 2,301      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 766      
Improvements, Costs capitalized subsequent to acquisition 2,649      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,056      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 3,660      
Total 5,716      
Accumulated depreciation and amortization $ 0      
1525 Comstock Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1525 Comstock Street      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 2,293      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 16,216      
Improvements, Costs capitalized subsequent to acquisition 30,980      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,061      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 47,428      
Total 49,489      
Accumulated depreciation and amortization $ (30,883)      
43830 Devin Shafron Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 43830 Devin Shafron Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 5,509      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 73,893      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,509      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 73,893      
Total 79,402      
Accumulated depreciation and amortization $ (36,654)      
1232 Alma Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1232 Alma Road      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 2,267      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,740      
Improvements, Costs capitalized subsequent to acquisition 64,717      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,266      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 68,458      
Total 70,724      
Accumulated depreciation and amortization $ (37,895)      
900 Quality Way        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 900 Quality Way      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 1,446      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 1,659      
Improvements, Costs capitalized subsequent to acquisition 69,251      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,437      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 70,919      
Total 72,356      
Accumulated depreciation and amortization $ (17,711)      
1210 Integrity Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1210 Integrity Drive      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 2,041      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,389      
Improvements, Costs capitalized subsequent to acquisition 151,385      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,429      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 153,386      
Total 156,815      
Accumulated depreciation and amortization $ (2,344)      
907 Security Row        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 907 Security Row      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 333      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 344      
Improvements, Costs capitalized subsequent to acquisition 97,522      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,112      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 96,087      
Total 98,199      
Accumulated depreciation and amortization $ (6,008)      
908 Quality Way        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 908 Quality Way      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 6,730      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 4,493      
Improvements, Costs capitalized subsequent to acquisition 13,873      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,067      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 23,029      
Total 25,096      
Accumulated depreciation and amortization $ (16,779)      
904 Quality Way        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 904 Quality Way      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 760      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 744      
Improvements, Costs capitalized subsequent to acquisition 6,819      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,151      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 7,172      
Total 8,323      
Accumulated depreciation and amortization $ (1,004)      
1215 Integrity Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1215 Integrity Drive      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 70,076      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 995      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 69,081      
Total 70,076      
Accumulated depreciation and amortization $ (14,120)      
1350 Duane & 3080 Raymond        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1350 Duane & 3080 Raymond      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 7,081      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 69,817      
Improvements, Costs capitalized subsequent to acquisition 61      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,081      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 69,878      
Total 76,959      
Accumulated depreciation and amortization $ (14,781)      
45901 & 45845 Nokes Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 45901 & 45845 Nokes Boulevard      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 3,437      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 28,785      
Improvements, Costs capitalized subsequent to acquisition 450      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,437      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 29,235      
Total 32,672      
Accumulated depreciation and amortization $ (6,552)      
21561 & 21571 Beaumeade Circle        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 21561 & 21571 Beaumeade Circle      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 3,966      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 24,211      
Improvements, Costs capitalized subsequent to acquisition 45      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,966      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 24,256      
Total 28,222      
Accumulated depreciation and amortization $ (5,010)      
60 & 80 Merritt        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 60 & 80 Merritt      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 3,418      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 71,477      
Improvements, Costs capitalized subsequent to acquisition 94,414      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,418      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 165,891      
Total 169,309      
Accumulated depreciation and amortization $ (35,258)      
55 Middlesex        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 55 Middlesex      
Metropolitan Area Boston      
Encumbrances $ 0      
Land, Initial costs 9,975      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 68,363      
Improvements, Costs capitalized subsequent to acquisition 10,483      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 9,975      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 78,846      
Total 88,821      
Accumulated depreciation and amortization $ (22,557)      
128 First Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 128 First Avenue      
Metropolitan Area Boston      
Encumbrances $ 0      
Land, Initial costs 5,465      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 185,348      
Improvements, Costs capitalized subsequent to acquisition 38,419      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,465      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 223,767      
Total 229,232      
Accumulated depreciation and amortization $ (61,794)      
Cateringweg 5        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Cateringweg 5      
Metropolitan Area Amsterdam      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 3,518      
Buildings and improvements, Initial costs 3,517      
Improvements, Costs capitalized subsequent to acquisition 40,982      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 3,451      
Buildings and improvements, Total costs 44,566      
Total 48,017      
Accumulated depreciation and amortization $ (7,662)      
1725 Comstock Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1725 Comstock Street      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 3,274      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 6,567      
Improvements, Costs capitalized subsequent to acquisition 39,032      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,274      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 45,599      
Total 48,873      
Accumulated depreciation and amortization $ (22,476)      
3105 Alfred Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 3105 Alfred Street      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 6,533      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,725      
Improvements, Costs capitalized subsequent to acquisition 101,204      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,093      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 104,369      
Total 111,462      
Accumulated depreciation and amortization $ (26,181)      
365 Main Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 365 Main Street      
Metropolitan Area San Francisco      
Encumbrances $ 0      
Land, Initial costs 22,854      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 158,709      
Improvements, Costs capitalized subsequent to acquisition 26,171      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 22,854      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 184,880      
Total 207,734      
Accumulated depreciation and amortization $ (46,836)      
720 2nd Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 720 2nd Street      
Metropolitan Area San Francisco      
Encumbrances $ 0      
Land, Initial costs 3,884      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 116,861      
Improvements, Costs capitalized subsequent to acquisition 10,235      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,884      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 127,096      
Total 130,980      
Accumulated depreciation and amortization $ (29,074)      
2260 East El Segundo        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2260 East El Segundo      
Metropolitan Area Los Angeles      
Encumbrances $ 0      
Land, Initial costs 11,053      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 51,397      
Improvements, Costs capitalized subsequent to acquisition 15,162      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 11,053      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 66,559      
Total 77,612      
Accumulated depreciation and amortization $ (18,057)      
2121 South Price Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2121 South Price Road      
Metropolitan Area Phoenix      
Encumbrances $ 0      
Land, Initial costs 7,335      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 238,452      
Improvements, Costs capitalized subsequent to acquisition 208,424      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,335      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 446,876      
Total 454,211      
Accumulated depreciation and amortization $ (108,717)      
4030 Lafayette        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 4030 Lafayette      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 2,492      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 16,912      
Improvements, Costs capitalized subsequent to acquisition 5,703      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,492      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 22,615      
Total 25,107      
Accumulated depreciation and amortization $ (5,546)      
4040 Lafayette        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 4040 Lafayette      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 1,246      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 4,267      
Improvements, Costs capitalized subsequent to acquisition 24,667      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,246      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 28,934      
Total 30,180      
Accumulated depreciation and amortization $ (3,755)      
4050 Lafayette        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 4050 Lafayette      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 1,246      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 4,371      
Improvements, Costs capitalized subsequent to acquisition 35,673      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,246      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 40,044      
Total 41,290      
Accumulated depreciation and amortization $ (20,175)      
2805 Lafayette Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2805 Lafayette Street      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 8,976      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 18,155      
Improvements, Costs capitalized subsequent to acquisition 129,101      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 8,294      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 147,938      
Total 156,232      
Accumulated depreciation and amortization $ (24,526)      
29A International Business Park        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 29A International Business Park      
Metropolitan Area Singapore      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 137,545      
Improvements, Costs capitalized subsequent to acquisition 219,764      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 357,309      
Total 357,309      
Accumulated depreciation and amortization $ (106,907)      
43940 Digital Loudoun Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 43940 Digital Loudoun Plaza      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 6,229      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 269,748      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,564      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 268,413      
Total 275,977      
Accumulated depreciation and amortization $ (58,213)      
44060 Digital Loudoun Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 44060 Digital Loudoun Plaza      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 3,700      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 187,396      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,441      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 187,655      
Total 191,096      
Accumulated depreciation and amortization $ (17,720)      
44100 Digital Loudoun Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 44100 Digital Loudoun Plaza      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 3,700      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 138,933      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,493      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 139,140      
Total 142,633      
Accumulated depreciation and amortization $ (5,679)      
43780 Digital Loudoun Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 43780 Digital Loudoun Plaza      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 3,671      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 120,875      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,186      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 120,360      
Total 124,546      
Accumulated depreciation and amortization $ (4,420)      
1-11 Templar Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1-11 Templar Road      
Metropolitan Area Sydney      
Encumbrances $ 0      
Land, Initial costs 6,937      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 69,908      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,837      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 72,008      
Total 76,845      
Accumulated depreciation and amortization $ (13,643)      
13-23 Templar Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 13-23 Templar Road      
Metropolitan Area Sydney      
Land, Initial costs $ 4,236      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 4,956      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,845      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 5,347      
Total 9,192      
Accumulated depreciation and amortization $ 0      
Fountain Court        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Fountain Court      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 7,544      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 12,506      
Improvements, Costs capitalized subsequent to acquisition 100,618      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,695      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 113,973      
Total 120,668      
Accumulated depreciation and amortization $ (19,418)      
72 Radnor Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 72 Radnor Drive      
Metropolitan Area Melbourne      
Encumbrances $ 0      
Land, Initial costs 2,568      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 59,222      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,939      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 59,851      
Total 61,790      
Accumulated depreciation and amortization $ (8,281)      
98 Radnor Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 98 Radnor Drive      
Metropolitan Area Melbourne      
Encumbrances $ 0      
Land, Initial costs 1,899      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 39,531      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,490      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 39,940      
Total 41,430      
Accumulated depreciation and amortization $ (13,924)      
105 Cabot Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 105 Cabot Street      
Metropolitan Area Boston      
Encumbrances $ 0      
Land, Initial costs 2,386      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 58,828      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,448      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 58,766      
Total 61,214      
Accumulated depreciation and amortization $ (7,376)      
3825 NW Aloclek Place        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 3825 NW Aloclek Place      
Metropolitan Area Portland      
Encumbrances $ 0      
Land, Initial costs 1,689      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 57,750      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,689      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 57,750      
Total 59,439      
Accumulated depreciation and amortization $ (17,667)      
Profile Park        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Profile Park      
Metropolitan Area Dublin      
Encumbrances $ 0      
Land, Initial costs 6,288      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 46,081      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,976      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 46,393      
Total 52,369      
Accumulated depreciation and amortization $ (2,698)      
760 Doug Davis Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 760 Doug Davis Drive      
Metropolitan Area Atlanta      
Encumbrances $ 0      
Land, Initial costs 4,837      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 53,551      
Improvements, Costs capitalized subsequent to acquisition 3,282      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,837      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 56,833      
Total 61,670      
Accumulated depreciation and amortization $ (11,618)      
360 Spear Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 360 Spear Street      
Metropolitan Area San Francisco      
Encumbrances $ 0      
Land, Initial costs 19,828      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 56,733      
Improvements, Costs capitalized subsequent to acquisition (912)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 19,828      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 55,821      
Total 75,649      
Accumulated depreciation and amortization $ (12,113)      
2501 S. State Hwy 121        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2501 S. State Hwy 121      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 23,137      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 93,943      
Improvements, Costs capitalized subsequent to acquisition 17,767      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 23,137      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 111,710      
Total 134,847      
Accumulated depreciation and amortization $ (26,920)      
9333 Grand Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 9333 Grand Avenue      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 5,686      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 14,515      
Improvements, Costs capitalized subsequent to acquisition 73,789      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,205      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 92,785      
Total 93,990      
Accumulated depreciation and amortization $ (27,826)      
9355 Grand Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 9355 Grand Avenue      
Metropolitan Area Chicago      
Encumbrances $ 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 227,922      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,518      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 225,404      
Total 227,922      
Accumulated depreciation and amortization $ (14,665)      
9377 Grand Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 9377 Grand Avenue      
Metropolitan Area Chicago      
Encumbrances $ 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 107,005      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,102      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 104,903      
Total 107,005      
Accumulated depreciation and amortization $ (1,575)      
850 E Collins        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 850 E Collins      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 1,614      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 83,988      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,614      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 83,988      
Total 85,602      
Accumulated depreciation and amortization $ (15,024)      
950 E Collins        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 950 E Collins      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 1,546      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 74,611      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,546      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 74,611      
Total 76,157      
Accumulated depreciation and amortization $ (9,276)      
400 S. Akard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 400 S. Akard      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 10,075      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 62,730      
Improvements, Costs capitalized subsequent to acquisition 2,473      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 10,075      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 65,203      
Total 75,278      
Accumulated depreciation and amortization $ (9,792)      
410 Commerce Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 410 Commerce Boulevard      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 29,839      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 29,839      
Total 29,839      
Accumulated depreciation and amortization $ (10,439)      
Croydon        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Croydon      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 1,683      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 104,728      
Improvements, Costs capitalized subsequent to acquisition 48,677      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,413      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 152,675      
Total 155,088      
Accumulated depreciation and amortization $ (23,186)      
Watford        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Watford      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 7,355      
Buildings and improvements, Initial costs 219,273      
Improvements, Costs capitalized subsequent to acquisition 5,693      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 6,619      
Buildings and improvements, Total costs 225,702      
Total 232,321      
Accumulated depreciation and amortization $ (34,406)      
Unit 21 Goldsworth Park        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Unit 21 Goldsworth Park      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 17,334      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 928,129      
Improvements, Costs capitalized subsequent to acquisition (120,819)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 13,495      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 811,149      
Total 824,644      
Accumulated depreciation and amortization $ (128,322)      
11900 East Cornell        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 11900 East Cornell      
Metropolitan Area Denver      
Encumbrances $ 0      
Land, Initial costs 3,352      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 80,640      
Improvements, Costs capitalized subsequent to acquisition 2,236      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,352      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 82,876      
Total 86,228      
Accumulated depreciation and amortization $ (14,534)      
701 Union Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 701 Union Boulevard      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 10,045      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 6,755      
Improvements, Costs capitalized subsequent to acquisition 26,299      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 10,045      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 33,054      
Total 43,099      
Accumulated depreciation and amortization $ 0      
23 Waterloo Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 23 Waterloo Road      
Metropolitan Area Sydney      
Encumbrances $ 0      
Land, Initial costs 7,112      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,868      
Improvements, Costs capitalized subsequent to acquisition (2,731)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,343      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 2,906      
Total 8,249      
Accumulated depreciation and amortization $ (410)      
1 Rue Jean-Pierre        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1 Rue Jean-Pierre      
Metropolitan Area Paris      
Encumbrances $ 0      
Land, Initial costs 9,621      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 35,825      
Improvements, Costs capitalized subsequent to acquisition (4,092)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 8,754      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 32,600      
Total 41,354      
Accumulated depreciation and amortization $ (5,912)      
Liet-dit le Christ de Saclay        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Liet-dit le Christ de Saclay      
Metropolitan Area Paris      
Encumbrances $ 0      
Land, Initial costs 3,402      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,090      
Improvements, Costs capitalized subsequent to acquisition (584)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,096      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 2,812      
Total 5,908      
Accumulated depreciation and amortization $ (658)      
127 Rue de Paris        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 127 Rue de Paris      
Metropolitan Area Paris      
Encumbrances $ 0      
Land, Initial costs 8,637      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 10,838      
Improvements, Costs capitalized subsequent to acquisition (1,753)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,860      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 9,862      
Total 17,722      
Accumulated depreciation and amortization $ (2,225)      
17201 Waterview Parkway        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 17201 Waterview Parkway      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 2,070      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 6,409      
Improvements, Costs capitalized subsequent to acquisition (1)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,070      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 6,408      
Total 8,478      
Accumulated depreciation and amortization $ (1,036)      
1900 S. Price Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1900 S. Price Road      
Metropolitan Area Phoenix      
Encumbrances $ 0      
Land, Initial costs 5,380      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 16,975      
Improvements, Costs capitalized subsequent to acquisition 975      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,512      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 17,818      
Total 23,330      
Accumulated depreciation and amortization $ (2,013)      
371 Gough Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 371 Gough Road      
Metropolitan Area Toronto      
Encumbrances $ 0      
Land, Initial costs 7,394      
Buildings and improvements, Initial costs 677      
Improvements, Costs capitalized subsequent to acquisition 96,446      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,033      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 98,484      
Total 104,517      
Accumulated depreciation and amortization $ (7,587)      
1500 Towerview Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1500 Towerview Road      
Metropolitan Area Minneapolis      
Encumbrances $ 0      
Land, Initial costs 10,190      
Buildings and improvements, Initial costs 20,054      
Improvements, Costs capitalized subsequent to acquisition 3,191      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 10,190      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 23,245      
Total 33,435      
Accumulated depreciation and amortization $ (3,943)      
Principal Park        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Principal Park      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 11,837      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 110,458      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 13,077      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 109,218      
Total 122,295      
Accumulated depreciation and amortization $ (7,136)      
MetCenter Business Park        
Real Estate and Accumulated Depreciation [Line Items]        
Properties MetCenter Business Park      
Metropolitan Area Austin      
Encumbrances $ 0      
Land, Initial costs 8,604      
Buildings and improvements, Initial costs 20,314      
Improvements, Costs capitalized subsequent to acquisition (28,891)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 27      
Total 27      
Accumulated depreciation and amortization $ 0      
Liverpoolweg 10        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Liverpoolweg 10      
Metropolitan Area Amsterdam      
Encumbrances $ 0      
Land, Initial costs 733      
Buildings and improvements, Initial costs 3,122      
Improvements, Costs capitalized subsequent to acquisition 10,368      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 675      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 13,548      
Total 14,223      
Accumulated depreciation and amortization $ (1,889)      
DePresident        
Real Estate and Accumulated Depreciation [Line Items]        
Properties DePresident      
Metropolitan Area Amsterdam      
Encumbrances $ 0      
Land, Initial costs 6,737      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 79,880      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 8,169      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 78,448      
Total 86,617      
Accumulated depreciation and amortization $ (625)      
Crawley 2        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Crawley 2      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 24,305      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 51,331      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 21,622      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 54,014      
Total 75,636      
Accumulated depreciation and amortization $ (327)      
Digital Deer Park 3        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Digital Deer Park 3      
Metropolitan Area Melbourne      
Encumbrances $ 0      
Land, Initial costs 1,600      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 167      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,765      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 2      
Total 1,767      
Accumulated depreciation and amortization $ 0      
3 Loyang Way        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 3 Loyang Way      
Metropolitan Area Singapore      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 120,508      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 120,508      
Total 120,508      
Accumulated depreciation and amortization $ (1,092)      
Digital Loudoun III        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Digital Loudoun III      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 43,000      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 179,393      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 57,806      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 164,587      
Total 222,393      
Accumulated depreciation and amortization $ (109)      
Digital Frankfurt        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Digital Frankfurt      
Metropolitan Area Frankfurt      
Encumbrances $ 0      
Land, Initial costs 5,543      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 62,539      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 10,051      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 58,031      
Total 68,082      
Accumulated depreciation and amortization $ 0      
56 Marietta Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 56 Marietta Street      
Metropolitan Area Atlanta      
Encumbrances $ 0      
Land, Initial costs 1,700      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 211,397      
Improvements, Costs capitalized subsequent to acquisition 13,838      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,700      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 225,235      
Total 226,935      
Accumulated depreciation and amortization $ (20,292)      
2 Peekay Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2 Peekay Drive      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 115,439      
Improvements, Costs capitalized subsequent to acquisition 15,264      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 130,703      
Total 130,703      
Accumulated depreciation and amortization $ (16,015)      
100 Delawanna Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 100 Delawanna Avenue      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 3,600      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 85,438      
Improvements, Costs capitalized subsequent to acquisition 4,655      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,600      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 90,093      
Total 93,693      
Accumulated depreciation and amortization $ (7,222)      
60 Hudson Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 60 Hudson Street      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 32,280      
Improvements, Costs capitalized subsequent to acquisition 8,180      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 40,460      
Total 40,460      
Accumulated depreciation and amortization $ (7,751)      
32 Avenue of the Americas        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 32 Avenue of the Americas      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 30,980      
Improvements, Costs capitalized subsequent to acquisition 2,001      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 32,981      
Total 32,981      
Accumulated depreciation and amortization $ (5,528)      
3433 S 120th Place        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 3433 S 120th Place      
Metropolitan Area Seattle      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 11,688      
Improvements, Costs capitalized subsequent to acquisition 1,935      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 13,623      
Total 13,623      
Accumulated depreciation and amortization $ (3,510)      
8435 Stemmons Freeway        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 8435 Stemmons Freeway      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 5,023      
Improvements, Costs capitalized subsequent to acquisition 1,724      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 6,747      
Total 6,747      
Accumulated depreciation and amortization $ (1,453)      
2625 Walsh Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2625 Walsh Avenue      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 4,276      
Improvements, Costs capitalized subsequent to acquisition 6,218      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 10,494      
Total 10,494      
Accumulated depreciation and amortization $ (1,415)      
111 8th Avenue - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 111 8th Avenue - Telx      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 42,454      
Improvements, Costs capitalized subsequent to acquisition 8,778      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 51,232      
Total 51,232      
Accumulated depreciation and amortization $ (11,387)      
350 East Cermak Road - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 350 East Cermak Road - Telx      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 13,933      
Improvements, Costs capitalized subsequent to acquisition 4,747      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 18,680      
Total 18,680      
Accumulated depreciation and amortization $ (3,385)      
200 Paul Avenue - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 200 Paul Avenue - Telx      
Metropolitan Area San Francisco      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 6,719      
Improvements, Costs capitalized subsequent to acquisition 2,433      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 9,152      
Total 9,152      
Accumulated depreciation and amortization $ (1,777)      
2323 Bryan Street - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2323 Bryan Street - Telx      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 5,191      
Improvements, Costs capitalized subsequent to acquisition 2,332      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 7,523      
Total 7,523      
Accumulated depreciation and amortization $ (1,639)      
600 W. 7th Street - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 600 W. 7th Street - Telx      
Metropolitan Area Los Angeles      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,689      
Improvements, Costs capitalized subsequent to acquisition 2,763      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 6,452      
Total 6,452      
Accumulated depreciation and amortization $ (1,034)      
3825 NW Aloclek Place - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 3825 NW Aloclek Place - Telx      
Metropolitan Area Portland      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,131      
Improvements, Costs capitalized subsequent to acquisition 928      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 4,059      
Total 4,059      
Accumulated depreciation and amortization $ (811)      
120 E. Van Buren Street - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 120 E. Van Buren Street - Telx      
Metropolitan Area Phoenix      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 2,848      
Improvements, Costs capitalized subsequent to acquisition 2,088      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 4,936      
Total 4,936      
Accumulated depreciation and amortization $ (778)      
36 NE 2nd Street - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 36 NE 2nd Street - Telx      
Metropolitan Area Miami      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 1,842      
Improvements, Costs capitalized subsequent to acquisition 1,460      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 3,302      
Total 3,302      
Accumulated depreciation and amortization $ (711)      
600-780 S. Federal Street - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 600-780 S. Federal Street - Telx      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 1,815      
Improvements, Costs capitalized subsequent to acquisition 2,389      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 4,204      
Total 4,204      
Accumulated depreciation and amortization $ (597)      
113 N. Myers Street - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 113 N. Myers Street - Telx      
Metropolitan Area Charlotte      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 476      
Improvements, Costs capitalized subsequent to acquisition 52      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 528      
Total 528      
Accumulated depreciation and amortization $ (135)      
1100 Space Park Drive - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1100 Space Park Drive - Telx      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 352      
Improvements, Costs capitalized subsequent to acquisition 227      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 579      
Total 579      
Accumulated depreciation and amortization $ (116)      
300 Boulevard East - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 300 Boulevard East - Telx      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 197      
Improvements, Costs capitalized subsequent to acquisition 53      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 250      
Total 250      
Accumulated depreciation and amortization $ (99)      
Science Park        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Science Park      
Metropolitan Area Amsterdam      
Encumbrances $ 0      
Land, Initial costs 665      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 75,095      
Improvements, Costs capitalized subsequent to acquisition 26,200      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 720      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 101,240      
Total 101,960      
Accumulated depreciation and amortization $ (3,989)      
Sovereign House        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Sovereign House      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 7,943      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 75,184      
Improvements, Costs capitalized subsequent to acquisition 5,454      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 8,243      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 80,338      
Total 88,581      
Accumulated depreciation and amortization $ (7,741)      
Amstel Business Park        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Amstel Business Park      
Metropolitan Area Amsterdam      
Encumbrances $ 0      
Land, Initial costs 2,991      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 58,138      
Improvements, Costs capitalized subsequent to acquisition 15,861      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,241      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 73,749      
Total 76,990      
Accumulated depreciation and amortization $ (8,830)      
Olivers Yard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Olivers Yard      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 7,943      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 34,744      
Improvements, Costs capitalized subsequent to acquisition 2,504      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 8,243      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 36,948      
Total 45,191      
Accumulated depreciation and amortization $ (6,242)      
Bonnington House        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Bonnington House      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 14,127      
Improvements, Costs capitalized subsequent to acquisition 2,268      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 16,395      
Total 16,395      
Accumulated depreciation and amortization $ (635)      
West Drayton        
Real Estate and Accumulated Depreciation [Line Items]        
Properties West Drayton      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 10,135      
Improvements, Costs capitalized subsequent to acquisition 964      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 11,099      
Total 11,099      
Accumulated depreciation and amortization $ (2,928)      
Lyonerstrasse        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Lyonerstrasse      
Metropolitan Area Frankfurt      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 8,407      
Improvements, Costs capitalized subsequent to acquisition 1,254      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 9,661      
Total 9,661      
Accumulated depreciation and amortization $ (2,163)      
Meridian Gate        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Meridian Gate      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 5,893      
Improvements, Costs capitalized subsequent to acquisition 572      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 6,465      
Total 6,465      
Accumulated depreciation and amortization $ (1,561)      
NE Corner of Campbell Road and Ferris Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties NE Corner of Campbell Road and Ferris Road      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 21,902      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 293      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 22,132      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 63      
Total 22,195      
Accumulated depreciation and amortization $ 0      
9401 West Grand Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 9401 West Grand Avenue      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 12,500      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 19,888      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 16,036      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 16,352      
Total 32,388      
Accumulated depreciation and amortization $ 0      
Broad Run Technology Park        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Broad Run Technology Park      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 18,019      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 11,983      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 26,574      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 3,428      
Total 30,002      
Accumulated depreciation and amortization $ 0      
2425-2553 Edgington Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2425-2553 Edgington Street      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 11,950      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 1,615      
Improvements, Costs capitalized subsequent to acquisition 35      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 11,959      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 1,641      
Total 13,600      
Accumulated depreciation and amortization $ (31)      
44490 Chilum Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 44490 Chilum Place      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 4,180      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 76,745      
Improvements, Costs capitalized subsequent to acquisition 564      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,180      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 77,309      
Total 81,489      
Accumulated depreciation and amortization $ (1,376)      
44520 Hastings Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 44520 Hastings Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 104,000      
Land, Initial costs 6,140      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 108,105      
Improvements, Costs capitalized subsequent to acquisition 785      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,140      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 108,890      
Total 115,030      
Accumulated depreciation and amortization $ (1,876)      
44521 Hastings Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 44521 Hastings Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 13,210      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 315,539      
Improvements, Costs capitalized subsequent to acquisition 0      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 13,210      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 315,539      
Total 328,749      
Accumulated depreciation and amortization $ (5,592)      
44461 Chilum Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 44461 Chilum Place      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 9,620      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 249,371      
Improvements, Costs capitalized subsequent to acquisition 0      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 9,620      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 249,371      
Total 258,991      
Accumulated depreciation and amortization $ (4,443)      
21625 Gresham Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 21625 Gresham Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 17,500      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 448,968      
Improvements, Costs capitalized subsequent to acquisition 52      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 17,500      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 449,020      
Total 466,520      
Accumulated depreciation and amortization $ (8,034)      
21745 Sir Timothy Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 21745 Sir Timothy Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 16,010      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 289,281      
Improvements, Costs capitalized subsequent to acquisition 3,801      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 16,010      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 293,082      
Total 309,092      
Accumulated depreciation and amortization $ (3,856)      
21744 Sir Timothy Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 21744 Sir Timothy Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 10,523      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 50,411      
Improvements, Costs capitalized subsequent to acquisition 77,273      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 10,601      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 127,606      
Total 138,207      
Accumulated depreciation and amortization $ 0      
2200 Busse Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2200 Busse Road      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 17,270      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 384,558      
Improvements, Costs capitalized subsequent to acquisition 790      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 17,270      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 385,348      
Total 402,618      
Accumulated depreciation and amortization $ (6,490)      
2299 Busse Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2299 Busse Road      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 12,780      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 348,348      
Improvements, Costs capitalized subsequent to acquisition 0      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 12,780      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 348,348      
Total 361,128      
Accumulated depreciation and amortization $ (6,092)      
1780 Business Center Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1780 Business Center Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 7,510      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 106,363      
Improvements, Costs capitalized subsequent to acquisition (61)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,510      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 106,302      
Total 113,812      
Accumulated depreciation and amortization $ (1,657)      
8217 Linton Hall Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 8217 Linton Hall Road      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 22,340      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 81,985      
Improvements, Costs capitalized subsequent to acquisition 0      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 22,340      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 81,985      
Total 104,325      
Accumulated depreciation and amortization $ (1,203)      
1400 East Devon Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1400 East Devon Avenue      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 11,012      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 178,627      
Improvements, Costs capitalized subsequent to acquisition 52,286      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 11,094      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 230,831      
Total 241,925      
Accumulated depreciation and amortization $ 0      
2220 De La Cruz Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2220 De La Cruz Blvd      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 84,650      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 634,007      
Improvements, Costs capitalized subsequent to acquisition 4,343      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 84,650      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 638,350      
Total 723,000      
Accumulated depreciation and amortization $ (9,353)      
1 Century Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1 Century Place      
Metropolitan Area Toronto      
Encumbrances $ 0      
Land, Initial costs 26,600      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 116,863      
Improvements, Costs capitalized subsequent to acquisition 41,361      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 25,742      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 159,082      
Total 184,824      
Accumulated depreciation and amortization $ 0      
505 North Railroad Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 505 North Railroad Avenue      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 20,431      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 245,810      
Improvements, Costs capitalized subsequent to acquisition 0      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 20,431      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 245,810      
Total 266,241      
Accumulated depreciation and amortization $ (552)      
250 Williams [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 250 Williams      
Metropolitan Area Atlanta      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 23,747      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 23,747      
Total 23,747      
Accumulated depreciation and amortization $ (952)      
Osaka 2 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Osaka 2      
Metropolitan Area Osaka      
Encumbrances $ 0      
Land, Initial costs 13,593      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 1,720      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 14,367      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 946      
Total 15,313      
Accumulated depreciation and amortization $ 0      
Osaka 3 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Osaka 3      
Metropolitan Area Osaka      
Encumbrances $ 0      
Land, Initial costs 4,713      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 19      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,732      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 0      
Total 4,732      
Accumulated depreciation and amortization $ 0      
De President II [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties De President II      
Metropolitan Area Amsterdam      
Encumbrances $ 0      
Land, Initial costs 6,315      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 1,680      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,252      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 743      
Total 7,995      
Accumulated depreciation and amortization $ 0      
Development Property -- N. Virginia [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Development Property -- N. Virginia      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 16,200      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 573      
Improvements, Costs capitalized subsequent to acquisition 29      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 16,200      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 602      
Total 16,802      
Accumulated depreciation and amortization $ 0      
Development Property -- Portland [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Development Property -- Portland      
Metropolitan Area Portland      
Encumbrances $ 0      
Land, Initial costs 11,672      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 5,924      
Improvements, Costs capitalized subsequent to acquisition 1,101      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 11,672      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 7,025      
Total 18,697      
Accumulated depreciation and amortization $ 0      
Development Property -- Phoenix [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Development Property -- Phoenix      
Metropolitan Area Phoenix      
Encumbrances $ 0      
Land, Initial costs 12,500      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 0      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 12,500      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 0      
Total 12,500      
Accumulated depreciation and amortization $ 0      
330 E. Cermak Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 330 E. Cermak Road      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 25,248      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition (2)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 25,246      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 0      
Total 25,246      
Accumulated depreciation and amortization $ 0      
44480 Hastings Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 44480 Hastings Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 12,860      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 278,384      
Improvements, Costs capitalized subsequent to acquisition 38      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 12,860      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 278,422      
Total 291,282      
Accumulated depreciation and amortization $ (4,934)      
Other        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Other      
Encumbrances $ 0      
Land, Initial costs 8,298      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 59,034      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 67,332      
Total 67,332      
Accumulated depreciation and amortization $ (8,774)