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Schedule III Properties And Accumulated Depreciation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 105,089      
Land, Initial costs 930,961      
Acquired ground lease, Initial costs 13,509      
Buildings and improvements, Initial costs 8,327,303      
Improvements, Costs capitalized subsequent to acquisition 7,620,170      
Carry costs, Costs capitalized subsequent to acquisition (5,351)      
Land, Total costs 804,830      
Acquired ground lease, Total costs 10,725      
Buildings and improvements, Total costs 16,071,037      
Total 16,886,592 $ 17,055,016 $ 16,915,936 $ 11,558,469
Accumulated depreciation and amortization $ (4,536,169) $ (3,935,267) $ (3,238,227) $ (2,668,509)
36 NE 2nd Street        
Real Estate and Accumulated Depreciation [Line Items]        
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 28,557      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,943      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 52,740      
Total 54,683      
Accumulated depreciation and amortization $ (20,112)      
2323 Bryan Street        
Real Estate and Accumulated Depreciation [Line Items]        
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 51,961      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,672      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 129,731      
Total 131,403      
Accumulated depreciation and amortization $ (77,314)      
300 Boulevard East        
Real Estate and Accumulated Depreciation [Line Items]        
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 56,701      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,140      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 105,227      
Total 110,367      
Accumulated depreciation and amortization $ (70,773)      
2334 Lundy Place        
Real Estate and Accumulated Depreciation [Line Items]        
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 63      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,607      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 23,071      
Total 26,678      
Accumulated depreciation and amortization $ (11,349)      
2440 Marsh Lane        
Real Estate and Accumulated Depreciation [Line Items]        
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 74,858      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,486      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 85,179      
Total 86,665      
Accumulated depreciation and amortization $ (70,641)      
4849 Alpha Road        
Real Estate and Accumulated Depreciation [Line Items]        
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 44,117      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,983      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 54,767      
Total 57,750      
Accumulated depreciation and amortization $ (37,360)      
600 West Seventh Street        
Real Estate and Accumulated Depreciation [Line Items]        
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 78,054      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 18,537      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 128,819      
Total 147,356      
Accumulated depreciation and amortization $ (73,549)      
2045 & 2055 Lafayette Street        
Real Estate and Accumulated Depreciation [Line Items]        
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 45      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,065      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 43,862      
Total 49,927      
Accumulated depreciation and amortization $ (20,264)      
11830 Webb Chapel Road        
Real Estate and Accumulated Depreciation [Line Items]        
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 2,534      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,881      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 37,007      
Total 42,888      
Accumulated depreciation and amortization $ (18,292)      
150 South First Street        
Real Estate and Accumulated Depreciation [Line Items]        
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 $ (14,486)      
200 Paul Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
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 122,607      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 13,162      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 199,649      
Total 212,811      
Accumulated depreciation and amortization $ (95,975)      
1100 Space Park Drive        
Real Estate and Accumulated Depreciation [Line Items]        
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 43,521      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,130      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 61,727      
Total 66,857      
Accumulated depreciation and amortization $ (36,889)      
3015 Winona Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
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 $ (4,007)      
350 East Cermak Road        
Real Estate and Accumulated Depreciation [Line Items]        
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 248,477      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 8,620      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 351,555      
Total 360,175      
Accumulated depreciation and amortization $ (238,555)      
2401 Walsh Street        
Real Estate and Accumulated Depreciation [Line Items]        
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 115      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,775      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 19,382      
Total 25,157      
Accumulated depreciation and amortization $ (9,323)      
2403 Walsh Street        
Real Estate and Accumulated Depreciation [Line Items]        
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 124      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,514      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 11,819      
Total 17,333      
Accumulated depreciation and amortization $ (5,944)      
200 North Nash Street        
Real Estate and Accumulated Depreciation [Line Items]        
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 344      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,562      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 12,847      
Total 17,409      
Accumulated depreciation and amortization $ (7,010)      
731 East Trade Street        
Real Estate and Accumulated Depreciation [Line Items]        
Metropolitan Area Charlotte      
Encumbrances $ 1,089      
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 (2,782)      
Unamortized premium $ 54      
113 North Myers        
Real Estate and Accumulated Depreciation [Line Items]        
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 5,007      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,098      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 8,134      
Total 9,232      
Accumulated depreciation and amortization $ (2,942)      
125 North Myers        
Real Estate and Accumulated Depreciation [Line Items]        
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 6,378      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,271      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 10,116      
Total 11,387      
Accumulated depreciation and amortization $ (7,820)      
Paul van Vlissingenstraat 16        
Real Estate and Accumulated Depreciation [Line Items]        
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 26,000      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 41,255      
Total 41,255      
Accumulated depreciation and amortization $ (22,108)      
600-780 S. Federal        
Real Estate and Accumulated Depreciation [Line Items]        
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 44,112      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,304      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 72,538      
Total 79,842      
Accumulated depreciation and amortization $ (20,834)      
Chemin de l'Epinglier 2        
Real Estate and Accumulated Depreciation [Line Items]        
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 (990)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 19,081      
Total 19,081      
Accumulated depreciation and amortization $ (8,548)      
7500 Metro Center Drive        
Real Estate and Accumulated Depreciation [Line Items]        
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 71,399      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,177      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 76,276      
Total 77,453      
Accumulated depreciation and amortization $ (16,572)      
3 Corporate Place        
Real Estate and Accumulated Depreciation [Line Items]        
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 92,737      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,543      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 105,415      
Total 106,958      
Accumulated depreciation and amortization $ (87,175)      
1115 Centennial Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
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 58,202      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 581      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 58,202      
Total 58,783      
Accumulated depreciation and amortization $ (2,518)      
4025 Midway Road        
Real Estate and Accumulated Depreciation [Line Items]        
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 30,398      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,017      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 44,614      
Total 46,631      
Accumulated depreciation and amortization $ (32,501)      
Clonshaugh Industrial Estate        
Real Estate and Accumulated Depreciation [Line Items]        
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 1,493      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 93      
Buildings and improvements, Total costs 8,413      
Total 8,506      
Accumulated depreciation and amortization $ (5,526)      
Digital Houston        
Real Estate and Accumulated Depreciation [Line Items]        
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 148,349      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,594      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 172,212      
Total 178,806      
Accumulated depreciation and amortization $ (80,689)      
120 E Van Buren        
Real Estate and Accumulated Depreciation [Line Items]        
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 121,422      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,524      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 279,244      
Total 283,768      
Accumulated depreciation and amortization $ (148,484)      
Gyroscoopweg 2E-2F        
Real Estate and Accumulated Depreciation [Line Items]        
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 (1,643)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 11,807      
Total 11,807      
Accumulated depreciation and amortization $ (5,260)      
Clonshaugh Industrial Estate II        
Real Estate and Accumulated Depreciation [Line Items]        
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 77,840      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 77,840      
Total 77,840      
Accumulated depreciation and amortization $ (50,061)      
600 Winter Street        
Real Estate and Accumulated Depreciation [Line Items]        
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 $ (2,757)      
2300 NW 89th Place        
Real Estate and Accumulated Depreciation [Line Items]        
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 $ (1,800)      
Unit 9, Blanchardstown Corporate Park        
Real Estate and Accumulated Depreciation [Line Items]        
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 23,867      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,623      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 64,195      
Total 65,818      
Accumulated depreciation and amortization $ (28,897)      
111 8th Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 17,688      
Improvements, Costs capitalized subsequent to acquisition 29,149      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 46,837      
Total 46,837      
Accumulated depreciation and amortization $ (33,612)      
8100 Boone Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
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 2,034      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 2,192      
Total 2,192      
Accumulated depreciation and amortization $ (2,192)      
3011 Lafayette Street        
Real Estate and Accumulated Depreciation [Line Items]        
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 53,352      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,354      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 63,657      
Total 67,011      
Accumulated depreciation and amortization $ (52,456)      
44470 Chilum Place        
Real Estate and Accumulated Depreciation [Line Items]        
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 $ (13,154)      
43881 Devin Shafron Drive        
Real Estate and Accumulated Depreciation [Line Items]        
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 97,322      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,653      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 120,953      
Total 125,606      
Accumulated depreciation and amortization $ (98,771)      
43831 Devin Shafron Drive        
Real Estate and Accumulated Depreciation [Line Items]        
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 1,441      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,027      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 17,688      
Total 20,715      
Accumulated depreciation and amortization $ (7,156)      
43791 Devin Shafron Drive        
Real Estate and Accumulated Depreciation [Line Items]        
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 78,515      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,490      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 95,959      
Total 99,449      
Accumulated depreciation and amortization $ (66,593)      
Mundells Roundabout        
Real Estate and Accumulated Depreciation [Line Items]        
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 44,158      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 21,131      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 54,381      
Total 75,512      
Accumulated depreciation and amortization $ (15,485)      
1500 Space Park Drive        
Real Estate and Accumulated Depreciation [Line Items]        
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 46,593      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,106      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 55,544      
Total 59,650      
Accumulated depreciation and amortization $ (53,696)      
Cressex 1        
Real Estate and Accumulated Depreciation [Line Items]        
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 21,335      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,548      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 31,452      
Total 34,000      
Accumulated depreciation and amortization $ (22,054)      
Naritaweg 52        
Real Estate and Accumulated Depreciation [Line Items]        
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 (5,561)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 917      
Buildings and improvements, Total costs 18,155      
Total 19,072      
Accumulated depreciation and amortization $ (6,396)      
1 St. Anne's Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
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 (736)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,014      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 785      
Total 1,799      
Accumulated depreciation and amortization $ (238)      
2 St. Anne's Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
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 34,379      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 676      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 35,320      
Total 35,996      
Accumulated depreciation and amortization $ (7,647)      
3 St. Anne's Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
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 81,570      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 14,901      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 105,099      
Total 120,000      
Accumulated depreciation and amortization $ (70,353)      
365 South Randolphville Road        
Real Estate and Accumulated Depreciation [Line Items]        
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 296,533      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,853      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 314,103      
Total 316,956      
Accumulated depreciation and amortization $ (155,008)      
701 & 717 Leonard Street        
Real Estate and Accumulated Depreciation [Line Items]        
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 969      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,165      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 10,903      
Total 13,068      
Accumulated depreciation and amortization $ (3,608)      
Manchester Technopark        
Real Estate and Accumulated Depreciation [Line Items]        
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 (7,539)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 16,379      
Total 16,379      
Accumulated depreciation and amortization $ (5,427)      
1201 Comstock Street        
Real Estate and Accumulated Depreciation [Line Items]        
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 27,687      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,398      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 27,988      
Total 31,386      
Accumulated depreciation and amortization $ (20,843)      
1550 Space Park Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 0      
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 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 0      
Total 0      
Accumulated depreciation and amortization $ 0      
1525 Comstock Street        
Real Estate and Accumulated Depreciation [Line Items]        
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 32,286      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,061      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 48,734      
Total 50,795      
Accumulated depreciation and amortization $ (36,862)      
43830 Devin Shafron Drive        
Real Estate and Accumulated Depreciation [Line Items]        
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 74,322      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,928      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 74,903      
Total 79,831      
Accumulated depreciation and amortization $ (50,129)      
1232 Alma Road        
Real Estate and Accumulated Depreciation [Line Items]        
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 66,014      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,266      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 69,755      
Total 72,021      
Accumulated depreciation and amortization $ (49,754)      
900 Quality Way        
Real Estate and Accumulated Depreciation [Line Items]        
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 69,987      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,437      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 71,655      
Total 73,092      
Accumulated depreciation and amortization $ (25,389)      
1210 Integrity Drive        
Real Estate and Accumulated Depreciation [Line Items]        
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 187,448      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,204      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 189,674      
Total 192,878      
Accumulated depreciation and amortization $ (13,445)      
907 Security Row        
Real Estate and Accumulated Depreciation [Line Items]        
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 97,851      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,112      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 96,416      
Total 98,528      
Accumulated depreciation and amortization $ (12,469)      
908 Quality Way        
Real Estate and Accumulated Depreciation [Line Items]        
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 13,954      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,067      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 23,110      
Total 25,177      
Accumulated depreciation and amortization $ (18,696)      
904 Quality Way        
Real Estate and Accumulated Depreciation [Line Items]        
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 6,812      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,151      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 7,165      
Total 8,316      
Accumulated depreciation and amortization $ (1,382)      
1215 Integrity Drive        
Real Estate and Accumulated Depreciation [Line Items]        
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 69,926      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 995      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 68,931      
Total 69,926      
Accumulated depreciation and amortization $ (23,033)      
1350 Duane & 3080 Raymond        
Real Estate and Accumulated Depreciation [Line Items]        
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 354      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,081      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 70,171      
Total 77,252      
Accumulated depreciation and amortization $ (18,445)      
60 & 80 Merritt        
Real Estate and Accumulated Depreciation [Line Items]        
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 94,485      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,148      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 166,232      
Total 169,380      
Accumulated depreciation and amortization $ (49,071)      
55 Middlesex        
Real Estate and Accumulated Depreciation [Line Items]        
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 14,499      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 9,975      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 82,862      
Total 92,837      
Accumulated depreciation and amortization $ (29,930)      
128 First Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
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 39,134      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,465      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 224,482      
Total 229,947      
Accumulated depreciation and amortization $ (80,988)      
Cateringweg 5        
Real Estate and Accumulated Depreciation [Line Items]        
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 37,814      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 3,223      
Buildings and improvements, Total costs 41,626      
Total 44,849      
Accumulated depreciation and amortization $ (9,429)      
1725 Comstock Street        
Real Estate and Accumulated Depreciation [Line Items]        
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 39,308      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,274      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 45,875      
Total 49,149      
Accumulated depreciation and amortization $ (29,302)      
3105 Alfred Street        
Real Estate and Accumulated Depreciation [Line Items]        
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 123,691      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,533      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 127,416      
Total 133,949      
Accumulated depreciation and amortization $ (38,853)      
365 Main Street        
Real Estate and Accumulated Depreciation [Line Items]        
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 35,001      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 22,854      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 193,710      
Total 216,564      
Accumulated depreciation and amortization $ (60,449)      
720 2nd Street        
Real Estate and Accumulated Depreciation [Line Items]        
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 13,601      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,884      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 130,462      
Total 134,346      
Accumulated depreciation and amortization $ (36,724)      
2260 East El Segundo        
Real Estate and Accumulated Depreciation [Line Items]        
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 17,433      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 11,053      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 68,830      
Total 79,883      
Accumulated depreciation and amortization $ (23,640)      
2121 South Price Road        
Real Estate and Accumulated Depreciation [Line Items]        
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 215,183      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,835      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 456,135      
Total 460,970      
Accumulated depreciation and amortization $ (147,927)      
4030 Lafayette        
Real Estate and Accumulated Depreciation [Line Items]        
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 12,780      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,492      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 29,692      
Total 32,184      
Accumulated depreciation and amortization $ (9,100)      
4040 Lafayette        
Real Estate and Accumulated Depreciation [Line Items]        
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 24,887      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,246      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 29,154      
Total 30,400      
Accumulated depreciation and amortization $ (5,804)      
4050 Lafayette        
Real Estate and Accumulated Depreciation [Line Items]        
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 36,244      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,246      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 40,615      
Total 41,861      
Accumulated depreciation and amortization $ (26,913)      
2805 Lafayette Street        
Real Estate and Accumulated Depreciation [Line Items]        
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 131,011      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 8,294      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 149,848      
Total 158,142      
Accumulated depreciation and amortization $ (38,954)      
29A International Business Park        
Real Estate and Accumulated Depreciation [Line Items]        
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 223,342      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 360,887      
Total 360,887      
Accumulated depreciation and amortization $ (152,206)      
43940 Digital Loudoun Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
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 285,614      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,524      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 284,319      
Total 291,843      
Accumulated depreciation and amortization $ (90,924)      
44060 Digital Loudoun Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
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 187,004      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,441      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 187,263      
Total 190,704      
Accumulated depreciation and amortization $ (31,598)      
44100 Digital Loudoun Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
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 141,840      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,493      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 142,047      
Total 145,540      
Accumulated depreciation and amortization $ (17,596)      
43780 Digital Loudoun Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
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 123,368      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,186      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 122,853      
Total 127,039      
Accumulated depreciation and amortization $ (12,532)      
1-11 Templar Road        
Real Estate and Accumulated Depreciation [Line Items]        
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 62,836      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,349      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 65,424      
Total 69,773      
Accumulated depreciation and amortization $ (19,316)      
13-23 Templar Road        
Real Estate and Accumulated Depreciation [Line Items]        
Metropolitan Area Sydney      
Encumbrances $ 0      
Land, Initial costs 4,236      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 52,379      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,501      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 54,114      
Total 56,615      
Accumulated depreciation and amortization $ (1,034)      
Fountain Court        
Real Estate and Accumulated Depreciation [Line Items]        
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 100,446      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,569      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 113,927      
Total 120,496      
Accumulated depreciation and amortization $ (30,892)      
72 Radnor Drive        
Real Estate and Accumulated Depreciation [Line Items]        
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 66,029      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,737      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 66,860      
Total 68,597      
Accumulated depreciation and amortization $ (12,370)      
98 Radnor Drive        
Real Estate and Accumulated Depreciation [Line Items]        
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 36,140      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,339      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 36,700      
Total 38,039      
Accumulated depreciation and amortization $ (17,738)      
105 Cabot Street        
Real Estate and Accumulated Depreciation [Line Items]        
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 35,876      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,161      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 37,101      
Total 38,262      
Accumulated depreciation and amortization $ (11,061)      
3825 NW Aloclek Place        
Real Estate and Accumulated Depreciation [Line Items]        
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 58,230      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,689      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 58,230      
Total 59,919      
Accumulated depreciation and amortization $ (24,836)      
Profile Park        
Real Estate and Accumulated Depreciation [Line Items]        
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 56,087      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,050      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 60,325      
Total 62,375      
Accumulated depreciation and amortization $ (6,256)      
760 Doug Davis Drive        
Real Estate and Accumulated Depreciation [Line Items]        
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 3,373      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,837      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 56,924      
Total 61,761      
Accumulated depreciation and amortization $ (15,131)      
2501 S. State Hwy 121        
Real Estate and Accumulated Depreciation [Line Items]        
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 11,954      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 16,242      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 112,792      
Total 129,034      
Accumulated depreciation and amortization $ (35,468)      
9333 Grand Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
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 75,076      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,205      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 94,072      
Total 95,277      
Accumulated depreciation and amortization $ (40,321)      
9355 Grand Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 228,171      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,518      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 225,653      
Total 228,171      
Accumulated depreciation and amortization $ (30,014)      
9377 Grand Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 133,910      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,799      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 131,111      
Total 133,910      
Accumulated depreciation and amortization $ (6,039)      
850 E Collins        
Real Estate and Accumulated Depreciation [Line Items]        
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 86,565      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,614      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 86,565      
Total 88,179      
Accumulated depreciation and amortization $ (23,682)      
950 E Collins        
Real Estate and Accumulated Depreciation [Line Items]        
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 75,695      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,546      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 75,695      
Total 77,241      
Accumulated depreciation and amortization $ (15,163)      
400 S. Akard        
Real Estate and Accumulated Depreciation [Line Items]        
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 2,943      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 10,075      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 65,673      
Total 75,748      
Accumulated depreciation and amortization $ (13,571)      
410 Commerce Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
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 30,260      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 30,260      
Total 30,260      
Accumulated depreciation and amortization $ (15,310)      
Croydon        
Real Estate and Accumulated Depreciation [Line Items]        
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 47,591      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,367      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 151,635      
Total 154,002      
Accumulated depreciation and amortization $ (31,430)      
Watford        
Real Estate and Accumulated Depreciation [Line Items]        
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 5,018      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 6,492      
Buildings and improvements, Total costs 225,154      
Total 231,646      
Accumulated depreciation and amortization $ (48,278)      
Unit 21 Goldsworth Park        
Real Estate and Accumulated Depreciation [Line Items]        
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 (121,080)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 13,237      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 811,146      
Total 824,383      
Accumulated depreciation and amortization $ (182,102)      
23 Waterloo Road        
Real Estate and Accumulated Depreciation [Line Items]        
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 (3,564)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,804      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 2,612      
Total 7,416      
Accumulated depreciation and amortization $ (500)      
1 Rue Jean-Pierre        
Real Estate and Accumulated Depreciation [Line Items]        
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 (6,820)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 8,177      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 30,449      
Total 38,626      
Accumulated depreciation and amortization $ (7,732)      
Liet-dit le Christ de Saclay        
Real Estate and Accumulated Depreciation [Line Items]        
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 (975)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,891      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 2,626      
Total 5,517      
Accumulated depreciation and amortization $ (861)      
127 Rue de Paris        
Real Estate and Accumulated Depreciation [Line Items]        
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 (2,923)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,341      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 9,211      
Total 16,552      
Accumulated depreciation and amortization $ (2,910)      
1900 S. Price Road        
Real Estate and Accumulated Depreciation [Line Items]        
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 (11,394)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,423      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 8,538      
Total 10,961      
Accumulated depreciation and amortization $ (2,412)      
371 Gough Road        
Real Estate and Accumulated Depreciation [Line Items]        
Metropolitan Area Toronto      
Encumbrances $ 0      
Land, Initial costs 7,394      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 677      
Improvements, Costs capitalized subsequent to acquisition 93,801      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,838      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 96,034      
Total 101,872      
Accumulated depreciation and amortization $ (13,452)      
1500 Towerview Road        
Real Estate and Accumulated Depreciation [Line Items]        
Metropolitan Area Minneapolis      
Encumbrances $ 0      
Land, Initial costs 10,190      
Acquired ground lease, Initial costs 0      
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 $ (5,566)      
Principal Park        
Real Estate and Accumulated Depreciation [Line Items]        
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 11,837      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 76,060      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,097      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 80,800      
Total 87,897      
Accumulated depreciation and amortization $ (13,080)      
Liverpoolweg 10        
Real Estate and Accumulated Depreciation [Line Items]        
Metropolitan Area Amsterdam      
Encumbrances $ 0      
Land, Initial costs 733      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,122      
Improvements, Costs capitalized subsequent to acquisition 9,429      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 630      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 12,654      
Total 13,284      
Accumulated depreciation and amortization $ (3,020)      
DePresident        
Real Estate and Accumulated Depreciation [Line Items]        
Metropolitan Area Amsterdam      
Encumbrances $ 0      
Land, Initial costs 6,737      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 116,399      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,996      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 116,140      
Total 123,136      
Accumulated depreciation and amortization $ (5,534)      
Crawley 2        
Real Estate and Accumulated Depreciation [Line Items]        
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 24,305      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 33,139      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,252      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 53,192      
Total 57,444      
Accumulated depreciation and amortization $ (2,048)      
3 Loyang Way        
Real Estate and Accumulated Depreciation [Line Items]        
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 180,615      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 180,615      
Total 180,615      
Accumulated depreciation and amortization $ (11,645)      
Digital Loudoun III        
Real Estate and Accumulated Depreciation [Line Items]        
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 800,087      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 47,399      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 795,688      
Total 843,087      
Accumulated depreciation and amortization $ (37,172)      
Digital Frankfurt        
Real Estate and Accumulated Depreciation [Line Items]        
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 137,399      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,111      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 138,831      
Total 142,942      
Accumulated depreciation and amortization $ (3,706)      
56 Marietta Street        
Real Estate and Accumulated Depreciation [Line Items]        
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 28,272      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,715      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 239,654      
Total 241,369      
Accumulated depreciation and amortization $ (42,690)      
2 Peekay Drive        
Real Estate and Accumulated Depreciation [Line Items]        
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 (16,103)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 99,336      
Total 99,336      
Accumulated depreciation and amortization $ (23,282)      
100 Delawanna Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
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 11,712      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,600      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 97,150      
Total 100,750      
Accumulated depreciation and amortization $ (14,734)      
60 Hudson Street        
Real Estate and Accumulated Depreciation [Line Items]        
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 18,735      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 51,015      
Total 51,015      
Accumulated depreciation and amortization $ (17,575)      
32 Avenue of the Americas        
Real Estate and Accumulated Depreciation [Line Items]        
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 4,362      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 35,342      
Total 35,342      
Accumulated depreciation and amortization $ (12,081)      
3433 S 120th Place        
Real Estate and Accumulated Depreciation [Line Items]        
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 (1,312)      
Carry costs, Costs capitalized subsequent to acquisition (5,351)      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 5,025      
Total 5,025      
Accumulated depreciation and amortization $ (5,024)      
8435 Stemmons Freeway        
Real Estate and Accumulated Depreciation [Line Items]        
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 2,725      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 7,748      
Total 7,748      
Accumulated depreciation and amortization $ (2,818)      
2625 Walsh Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
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 9,051      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 13,327      
Total 13,327      
Accumulated depreciation and amortization $ (4,017)      
111 8th Avenue - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
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 18,899      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 61,353      
Total 61,353      
Accumulated depreciation and amortization $ (23,063)      
350 East Cermak Road - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
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 11,031      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 24,964      
Total 24,964      
Accumulated depreciation and amortization $ (8,114)      
200 Paul Avenue - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
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 4,632      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 11,351      
Total 11,351      
Accumulated depreciation and amortization $ (3,864)      
2323 Bryan Street - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
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 5,621      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 10,812      
Total 10,812      
Accumulated depreciation and amortization $ (3,728)      
600 W. 7th Street - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
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 8,050      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 11,739      
Total 11,739      
Accumulated depreciation and amortization $ (3,018)      
3825 NW Aloclek Place - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
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 1,347      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 4,478      
Total 4,478      
Accumulated depreciation and amortization $ (1,857)      
120 E. Van Buren Street - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
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 3,451      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 6,299      
Total 6,299      
Accumulated depreciation and amortization $ (1,910)      
36 NE 2nd Street - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
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 4,374      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 6,216      
Total 6,216      
Accumulated depreciation and amortization $ (1,929)      
600-780 S. Federal Street - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
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 4,577      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 6,392      
Total 6,392      
Accumulated depreciation and amortization $ (1,588)      
113 N. Myers Street - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
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 1,142      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 1,618      
Total 1,618      
Accumulated depreciation and amortization $ (482)      
1100 Space Park Drive - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
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 2,265      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 2,617      
Total 2,617      
Accumulated depreciation and amortization $ (484)      
300 Boulevard East - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
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 168      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 365      
Total 365      
Accumulated depreciation and amortization $ (186)      
Science Park        
Real Estate and Accumulated Depreciation [Line Items]        
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 13,037      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 88,797      
Total 88,797      
Accumulated depreciation and amortization $ (8,152)      
Sovereign House        
Real Estate and Accumulated Depreciation [Line Items]        
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 58,238      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 141,365      
Total 141,365      
Accumulated depreciation and amortization $ (20,816)      
Amstel Business Park        
Real Estate and Accumulated Depreciation [Line Items]        
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 12,448      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,028      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 70,549      
Total 73,577      
Accumulated depreciation and amortization $ (20,491)      
Olivers Yard        
Real Estate and Accumulated Depreciation [Line Items]        
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 2,357      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 45,044      
Total 45,044      
Accumulated depreciation and amortization $ (13,783)      
Bonnington House        
Real Estate and Accumulated Depreciation [Line Items]        
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 64,055      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 78,182      
Total 78,182      
Accumulated depreciation and amortization $ (1,405)      
West Drayton        
Real Estate and Accumulated Depreciation [Line Items]        
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 3,519      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 13,654      
Total 13,654      
Accumulated depreciation and amortization $ (7,281)      
Lyonerstrasse        
Real Estate and Accumulated Depreciation [Line Items]        
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 6,393      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 14,800      
Total 14,800      
Accumulated depreciation and amortization $ (5,137)      
Meridian Gate        
Real Estate and Accumulated Depreciation [Line Items]        
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 1,621      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 7,514      
Total 7,514      
Accumulated depreciation and amortization $ (3,829)      
2425-2553 Edgington Street        
Real Estate and Accumulated Depreciation [Line Items]        
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 64      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 11,959      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 1,670      
Total 13,629      
Accumulated depreciation and amortization $ (160)      
44520 Hastings Drive        
Real Estate and Accumulated Depreciation [Line Items]        
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 1,581      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,140      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 109,686      
Total 115,826      
Accumulated depreciation and amortization $ (14,806)      
44480 Hastings Drive        
Real Estate and Accumulated Depreciation [Line Items]        
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 1,227      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 12,860      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 279,611      
Total 292,471      
Accumulated depreciation and amortization $ (38,147)      
44521 Hastings Drive        
Real Estate and Accumulated Depreciation [Line Items]        
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 361      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 13,210      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 315,900      
Total 329,110      
Accumulated depreciation and amortization $ (43,315)      
44461 Chilum Place        
Real Estate and Accumulated Depreciation [Line Items]        
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 523      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 9,620      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 249,894      
Total 259,514      
Accumulated depreciation and amortization $ (34,452)      
21625 Gresham Drive        
Real Estate and Accumulated Depreciation [Line Items]        
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 488      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 17,500      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 449,456      
Total 466,956      
Accumulated depreciation and amortization $ (62,151)      
2200 Busse Road        
Real Estate and Accumulated Depreciation [Line Items]        
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 1,905      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 17,270      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 386,463      
Total 403,733      
Accumulated depreciation and amortization $ (50,399)      
2299 Busse Road        
Real Estate and Accumulated Depreciation [Line Items]        
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 (1,687)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 12,780      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 346,661      
Total 359,441      
Accumulated depreciation and amortization $ (47,004)      
1780 Business Center Drive        
Real Estate and Accumulated Depreciation [Line Items]        
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 1,122      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,510      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 107,485      
Total 114,995      
Accumulated depreciation and amortization $ (13,001)      
8217 Linton Hall Road        
Real Estate and Accumulated Depreciation [Line Items]        
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 355      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 22,340      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 82,340      
Total 104,680      
Accumulated depreciation and amortization $ (9,386)      
1400 East Devon Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
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 45,871      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 9,994      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 225,516      
Total 235,510      
Accumulated depreciation and amortization $ (17,462)      
2220 De La Cruz Blvd        
Real Estate and Accumulated Depreciation [Line Items]        
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 4,588      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 84,650      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 638,595      
Total 723,245      
Accumulated depreciation and amortization $ (81,549)      
1 Century Place        
Real Estate and Accumulated Depreciation [Line Items]        
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 1,302      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 8,479      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 136,286      
Total 144,765      
Accumulated depreciation and amortization $ (4,861)      
505 North Railroad Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
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 (33,149)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 12,271      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 220,821      
Total 233,092      
Accumulated depreciation and amortization $ (12,612)      
250 Williams        
Real Estate and Accumulated Depreciation [Line Items]        
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 26,774      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 26,774      
Total 26,774      
Accumulated depreciation and amortization $ (5,240)      
CME Agreement        
Real Estate and Accumulated Depreciation [Line Items]        
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 42,875      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 42,875      
Total 42,875      
Accumulated depreciation and amortization $ (21,741)      
De President II        
Real Estate and Accumulated Depreciation [Line Items]        
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 37,181      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,453      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 41,043      
Total 43,496      
Accumulated depreciation and amortization $ 0      
2825-2845 Lafayette Street        
Real Estate and Accumulated Depreciation [Line Items]        
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 2,941      
Improvements, Costs capitalized subsequent to acquisition 60      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 3,001      
Total 3,001      
Accumulated depreciation and amortization $ (3,001)      
21780 Filigree Court        
Real Estate and Accumulated Depreciation [Line Items]        
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 24,315      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,039      
Improvements, Costs capitalized subsequent to acquisition 1,346      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 25,740      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 2,960      
Total 28,700      
Accumulated depreciation and amortization (491)      
Other        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 55,482      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 25      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 55,457      
Total 55,482      
Accumulated depreciation and amortization $ (18,053)