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Schedule III Properties And Accumulated Depreciation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 705,777      
Land, Initial costs 1,476,672      
Acquired ground lease, Initial costs 13,509      
Buildings and improvements, Initial costs 9,424,451      
Improvements, Costs capitalized subsequent to acquisition 7,925,253      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,509,764      
Acquired ground lease, Total costs 10,575      
Buildings and improvements, Total costs 17,319,546      
Total 18,839,885 $ 16,915,936 $ 11,558,469 $ 10,915,373
Accumulated depreciation and amortization $ (3,935,267) $ (3,238,227) $ (2,668,509) $ (2,251,268)
36 NE 2nd Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 36 NE 2nd Street      
Metropolitan Area Miami      
Encumbrances $ 0      
Land, Initial costs 1,942      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 24,184      
Improvements, Costs capitalized subsequent to acquisition 28,408      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,970      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 52,564      
Total 54,534      
Accumulated depreciation and amortization $ (17,441)      
2323 Bryan Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2323 Bryan Street      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 1,838      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 77,604      
Improvements, Costs capitalized subsequent to acquisition 55,942      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,838      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 133,546      
Total 135,384      
Accumulated depreciation and amortization $ (71,792)      
300 Boulevard East        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 300 Boulevard East      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 5,140      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 48,526      
Improvements, Costs capitalized subsequent to acquisition 62,649      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,140      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 111,175      
Total 116,315      
Accumulated depreciation and amortization $ (67,848)      
2334 Lundy Place        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2334 Lundy Place      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 3,607      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 23,008      
Improvements, Costs capitalized subsequent to acquisition 67      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,607      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 23,075      
Total 26,682      
Accumulated depreciation and amortization $ (10,813)      
2440 Marsh Lane        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2440 Marsh Lane      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 1,477      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 10,330      
Improvements, Costs capitalized subsequent to acquisition 73,754      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,486      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 84,075      
Total 85,561      
Accumulated depreciation and amortization $ (67,865)      
375 Riverside Parkway        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 375 Riverside Parkway      
Metropolitan Area Atlanta      
Encumbrances $ 0      
Land, Initial costs 1,250      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 11,578      
Improvements, Costs capitalized subsequent to acquisition 31,704      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,250      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 43,282      
Total 44,532      
Accumulated depreciation and amortization $ (31,210)      
4849 Alpha Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 4849 Alpha Road      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 2,983      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 10,650      
Improvements, Costs capitalized subsequent to acquisition 44,045      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,983      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 54,695      
Total 57,678      
Accumulated depreciation and amortization $ (33,311)      
600 West Seventh Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 600 West Seventh Street      
Metropolitan Area Los Angeles      
Encumbrances $ 0      
Land, Initial costs 18,478      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 50,824      
Improvements, Costs capitalized subsequent to acquisition 64,912      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 18,489      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 115,725      
Total 134,214      
Accumulated depreciation and amortization $ (68,601)      
2045 & 2055 Lafayette Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2045 & 2055 Lafayette Street      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 6,065      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 43,817      
Improvements, Costs capitalized subsequent to acquisition 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 $ (19,242)      
11830 Webb Chapel Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 11830 Webb Chapel Road      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 5,881      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 34,473      
Improvements, Costs capitalized subsequent to acquisition 2,355      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,881      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 36,828      
Total 42,709      
Accumulated depreciation and amortization $ (17,373)      
150 South First Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 150 South First Street      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 2,068      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 29,214      
Improvements, Costs capitalized subsequent to acquisition 1,499      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,068      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 30,713      
Total 32,781      
Accumulated depreciation and amortization $ (13,631)      
200 Paul Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 200 Paul Avenue      
Metropolitan Area San Francisco      
Encumbrances $ 0      
Land, Initial costs 14,427      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 75,777      
Improvements, Costs capitalized subsequent to acquisition 121,670      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 14,498      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 197,376      
Total 211,874      
Accumulated depreciation and amortization $ (87,390)      
1100 Space Park Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1100 Space Park Drive      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 5,130      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 18,206      
Improvements, Costs capitalized subsequent to acquisition 43,082      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,130      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 61,288      
Total 66,418      
Accumulated depreciation and amortization $ (34,035)      
3015 Winona Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 3015 Winona Avenue      
Metropolitan Area Los Angeles      
Encumbrances $ 0      
Land, Initial costs 6,534      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 8,356      
Improvements, Costs capitalized subsequent to acquisition 6      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,534      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 8,362      
Total 14,896      
Accumulated depreciation and amortization $ (3,825)      
350 East Cermak Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 350 East Cermak Road      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 8,466      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 103,232      
Improvements, Costs capitalized subsequent to acquisition 236,679      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 8,620      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 339,757      
Total 348,377      
Accumulated depreciation and amortization $ (223,795)      
8534 Concord Center Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 8534 Concord Center Drive      
Metropolitan Area Denver      
Encumbrances $ 0      
Land, Initial costs 2,181      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 11,561      
Improvements, Costs capitalized subsequent to acquisition 763      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,181      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 12,324      
Total 14,505      
Accumulated depreciation and amortization $ (5,537)      
2401 Walsh Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2401 Walsh Street      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 5,775      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 19,267      
Improvements, Costs capitalized subsequent to acquisition 37      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,775      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 19,304      
Total 25,079      
Accumulated depreciation and amortization $ (8,868)      
2403 Walsh Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2403 Walsh Street      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 5,514      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 11,695      
Improvements, Costs capitalized subsequent to acquisition 48      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,514      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 11,743      
Total 17,257      
Accumulated depreciation and amortization $ (5,675)      
200 North Nash Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 200 North Nash Street      
Metropolitan Area Los Angeles      
Encumbrances $ 0      
Land, Initial costs 4,562      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 12,503      
Improvements, Costs capitalized subsequent to acquisition 232      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,562      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 12,735      
Total 17,297      
Accumulated depreciation and amortization $ (6,734)      
731 East Trade Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 731 East Trade Street      
Metropolitan Area Charlotte      
Encumbrances $ 1,777      
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 (2,599)      
Unamortized net premiums $ 147      
113 North Myers        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 113 North Myers      
Metropolitan Area Charlotte      
Encumbrances $ 0      
Land, Initial costs 1,098      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,127      
Improvements, Costs capitalized subsequent to acquisition 4,762      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,098      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 7,889      
Total 8,987      
Accumulated depreciation and amortization $ (2,493)      
125 North Myers        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 125 North Myers      
Metropolitan Area Charlotte      
Encumbrances $ 0      
Land, Initial costs 1,271      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,738      
Improvements, Costs capitalized subsequent to acquisition 6,337      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,271      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 10,075      
Total 11,346      
Accumulated depreciation and amortization $ (7,697)      
Paul van Vlissingenstraat 16        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Paul van Vlissingenstraat 16      
Metropolitan Area Amsterdam      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 15,255      
Improvements, Costs capitalized subsequent to acquisition 26,722      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 41,977      
Total 41,977      
Accumulated depreciation and amortization $ (20,320)      
600-780 S. Federal        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 600-780 S. Federal      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 7,849      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 27,881      
Improvements, Costs capitalized subsequent to acquisition 35,990      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,975      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 63,745      
Total 71,720      
Accumulated depreciation and amortization $ (18,818)      
115 Second Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 115 Second Avenue      
Metropolitan Area Boston      
Encumbrances $ 0      
Land, Initial costs 1,691      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 12,569      
Improvements, Costs capitalized subsequent to acquisition 11,458      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,691      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 24,027      
Total 25,718      
Accumulated depreciation and amortization $ (15,050)      
Chemin de l’Epinglier 2        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Chemin de l’Epinglier 2      
Metropolitan Area Geneva      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 20,071      
Improvements, Costs capitalized subsequent to acquisition (558)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 19,513      
Total 19,513      
Accumulated depreciation and amortization $ (8,220)      
7500 Metro Center Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 7500 Metro Center Drive      
Metropolitan Area Austin      
Encumbrances $ 0      
Land, Initial costs 1,177      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 4,877      
Improvements, Costs capitalized subsequent to acquisition 69,483      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,177      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 74,360      
Total 75,537      
Accumulated depreciation and amortization $ (13,685)      
3 Corporate Place        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 3 Corporate Place      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 1,543      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 12,678      
Improvements, Costs capitalized subsequent to acquisition 86,885      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,543      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 99,563      
Total 101,106      
Accumulated depreciation and amortization $ (85,242)      
1115 Centennial Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1115 Centennial Avenue      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 581      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 58,109      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 581      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 58,109      
Total 58,690      
Accumulated depreciation and amortization $ (448)      
4025 Midway Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 4025 Midway Road      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 2,196      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 14,037      
Improvements, Costs capitalized subsequent to acquisition 30,842      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,196      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 44,879      
Total 47,075      
Accumulated depreciation and amortization $ (30,901)      
Clonshaugh Industrial Estate        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Clonshaugh Industrial Estate      
Metropolitan Area Dublin      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 1,444      
Buildings and improvements, Initial costs 5,569      
Improvements, Costs capitalized subsequent to acquisition 1,685      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 95      
Buildings and improvements, Total costs 8,603      
Total 8,698      
Accumulated depreciation and amortization $ (5,526)      
6800 Millcreek Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 6800 Millcreek Drive      
Metropolitan Area Toronto      
Encumbrances $ 0      
Land, Initial costs 1,657      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 11,352      
Improvements, Costs capitalized subsequent to acquisition 2,285      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,657      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 13,637      
Total 15,294      
Accumulated depreciation and amortization $ (6,984)      
101 Aquila Way        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 101 Aquila Way      
Metropolitan Area Atlanta      
Encumbrances $ 0      
Land, Initial costs 1,480      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 34,797      
Improvements, Costs capitalized subsequent to acquisition (11,162)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,556      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 23,559      
Total 25,115      
Accumulated depreciation and amortization $ 0      
Digital Houston        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Digital Houston      
Metropolitan Area Houston      
Encumbrances $ 0      
Land, Initial costs 6,965      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 23,492      
Improvements, Costs capitalized subsequent to acquisition 148,984      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,965      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 172,476      
Total 179,441      
Accumulated depreciation and amortization $ (70,198)      
120 E Van Buren        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 120 E Van Buren      
Metropolitan Area Phoenix      
Encumbrances $ 0      
Land, Initial costs 4,524      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 157,822      
Improvements, Costs capitalized subsequent to acquisition 120,452      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,524      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 278,274      
Total 282,798      
Accumulated depreciation and amortization $ (138,607)      
Gyroscoopweg 2E-2F        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Gyroscoopweg 2E-2F      
Metropolitan Area Amsterdam      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 13,450      
Improvements, Costs capitalized subsequent to acquisition (1,376)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 12,074      
Total 12,074      
Accumulated depreciation and amortization $ (5,113)      
Clonshaugh Industrial Estate II        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Clonshaugh Industrial Estate II      
Metropolitan Area Dublin      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 79,116      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 79,116      
Total 79,116      
Accumulated depreciation and amortization $ (47,814)      
600 Winter Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 600 Winter Street      
Metropolitan Area Boston      
Encumbrances $ 0      
Land, Initial costs 1,429      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 6,228      
Improvements, Costs capitalized subsequent to acquisition 456      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,429      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 6,684      
Total 8,113      
Accumulated depreciation and amortization $ (2,604)      
2300 NW 89th Place        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2300 NW 89th Place      
Metropolitan Area Miami      
Encumbrances $ 0      
Land, Initial costs 1,022      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,767      
Improvements, Costs capitalized subsequent to acquisition 19      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,022      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 3,786      
Total 4,808      
Accumulated depreciation and amortization $ (1,723)      
2055 East Technology Circle        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2055 East Technology Circle      
Metropolitan Area Phoenix      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 8,519      
Improvements, Costs capitalized subsequent to acquisition 30,060      
Carry costs, Costs capitalized subsequent to acquisition 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 38,579      
Total 38,579      
Accumulated depreciation and amortization $ (30,232)      
Unit 9, Blanchardstown Corporate Park        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Unit 9, Blanchardstown Corporate Park      
Metropolitan Area Dublin      
Encumbrances $ 0      
Land, Initial costs 1,927      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 40,024      
Improvements, Costs capitalized subsequent to acquisition 24,651      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,660      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 64,942      
Total 66,602      
Accumulated depreciation and amortization $ (26,209)      
111 8th Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 111 8th Avenue      
Metropolitan Area New York      
Encumbrances $ 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 17,688      
Improvements, Costs capitalized subsequent to acquisition 27,230      
Carry costs, Costs capitalized subsequent to acquisition 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 44,918      
Total 44,918      
Accumulated depreciation and amortization $ (31,402)      
8100 Boone Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 8100 Boone Boulevard      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 158      
Improvements, Costs capitalized subsequent to acquisition 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)      
21110 Ridgetop Circle        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 21110 Ridgetop Circle      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 2,934      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 14,311      
Improvements, Costs capitalized subsequent to acquisition 1,307      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,934      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 15,618      
Total 18,552      
Accumulated depreciation and amortization $ (5,991)      
3011 Lafayette Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 3011 Lafayette Street      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 3,354      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 10,305      
Improvements, Costs capitalized subsequent to acquisition 52,300      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,354      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 62,605      
Total 65,959      
Accumulated depreciation and amortization $ (51,360)      
44470 Chilum Place        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 44470 Chilum Place      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 3,531      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 37,360      
Improvements, Costs capitalized subsequent to acquisition 1      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,531      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 37,361      
Total 40,892      
Accumulated depreciation and amortization $ (12,144)      
43881 Devin Shafron Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 43881 Devin Shafron Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 4,653      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 23,631      
Improvements, Costs capitalized subsequent to acquisition 96,033      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,653      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 119,664      
Total 124,317      
Accumulated depreciation and amortization $ (96,517)      
43831 Devin Shafron Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 43831 Devin Shafron Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 3,027      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 16,247      
Improvements, Costs capitalized subsequent to acquisition 1,382      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,027      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 17,629      
Total 20,656      
Accumulated depreciation and amortization $ (6,485)      
43791 Devin Shafron Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 43791 Devin Shafron Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 3,490      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 17,444      
Improvements, Costs capitalized subsequent to acquisition 77,914      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,490      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 95,358      
Total 98,848      
Accumulated depreciation and amortization $ (61,691)      
Mundells Roundabout        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Mundells Roundabout      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 31,354      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 41,294      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 20,330      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 52,318      
Total 72,648      
Accumulated depreciation and amortization $ (13,558)      
1500 Space Park Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1500 Space Park Drive      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 6,732      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 6,325      
Improvements, Costs capitalized subsequent to acquisition 46,277      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,106      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 55,228      
Total 59,334      
Accumulated depreciation and amortization $ (53,527)      
Cressex 1        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Cressex 1      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 3,629      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 9,036      
Improvements, Costs capitalized subsequent to acquisition 19,302      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,452      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 29,515      
Total 31,967      
Accumulated depreciation and amortization $ (20,732)      
Naritaweg 52        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Naritaweg 52      
Metropolitan Area Amsterdam      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 1,192      
Buildings and improvements, Initial costs 23,441      
Improvements, Costs capitalized subsequent to acquisition (5,129)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 937      
Buildings and improvements, Total costs 18,567      
Total 19,504      
Accumulated depreciation and amortization $ (6,048)      
1 St. Anne’s Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1 St. Anne’s Boulevard      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 1,490      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 1,045      
Improvements, Costs capitalized subsequent to acquisition (804)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 976      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 755      
Total 1,731      
Accumulated depreciation and amortization $ (210)      
2 St. Anne’s Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2 St. Anne’s Boulevard      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 922      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 695      
Improvements, Costs capitalized subsequent to acquisition 32,979      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 650      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 33,946      
Total 34,596      
Accumulated depreciation and amortization $ (6,437)      
3 St. Anne’s Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 3 St. Anne’s Boulevard      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 22,079      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 16,351      
Improvements, Costs capitalized subsequent to acquisition 79,708      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 14,335      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 103,803      
Total 118,138      
Accumulated depreciation and amortization $ (60,140)      
365 South Randolphville Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 365 South Randolphville Road      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 3,019      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 17,404      
Improvements, Costs capitalized subsequent to acquisition 301,969      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,023      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 319,369      
Total 322,392      
Accumulated depreciation and amortization $ (133,568)      
701 & 717 Leonard Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 701 & 717 Leonard Street      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 2,165      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 9,934      
Improvements, Costs capitalized subsequent to acquisition 835      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,165      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 10,769      
Total 12,934      
Accumulated depreciation and amortization $ (3,255)      
Manchester Technopark        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Manchester Technopark      
Metropolitan Area Manchester      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 23,918      
Improvements, Costs capitalized subsequent to acquisition (8,161)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 15,757      
Total 15,757      
Accumulated depreciation and amortization $ (4,763)      
1201 Comstock Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1201 Comstock Street      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 2,093      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 1,606      
Improvements, Costs capitalized subsequent to acquisition 26,945      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,398      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 27,246      
Total 30,644      
Accumulated depreciation and amortization $ (20,433)      
1550 Space Park Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1550 Space Park Drive      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 2,301      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 766      
Improvements, Costs capitalized subsequent to acquisition 2,649      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,716      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 0      
Total 5,716      
Accumulated depreciation and amortization $ 0      
1525 Comstock Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1525 Comstock Street      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 2,293      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 16,216      
Improvements, Costs capitalized subsequent to acquisition 31,131      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,061      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 47,579      
Total 49,640      
Accumulated depreciation and amortization $ (34,656)      
43830 Devin Shafron Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 43830 Devin Shafron Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 5,509      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 74,916      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,509      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 74,916      
Total 80,425      
Accumulated depreciation and amortization $ (43,316)      
1232 Alma Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1232 Alma Road      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 2,267      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,740      
Improvements, Costs capitalized subsequent to acquisition 65,647      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,266      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 69,388      
Total 71,654      
Accumulated depreciation and amortization $ (43,853)      
900 Quality Way        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 900 Quality Way      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 1,446      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 1,659      
Improvements, Costs capitalized subsequent to acquisition 69,489      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,437      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 71,157      
Total 72,594      
Accumulated depreciation and amortization $ (21,533)      
1210 Integrity Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1210 Integrity Drive      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 2,041      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,389      
Improvements, Costs capitalized subsequent to acquisition 189,102      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,472      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 191,060      
Total 194,532      
Accumulated depreciation and amortization $ (6,435)      
907 Security Row        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 907 Security Row      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 333      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 344      
Improvements, Costs capitalized subsequent to acquisition 97,744      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,112      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 96,309      
Total 98,421      
Accumulated depreciation and amortization $ (9,228)      
908 Quality Way        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 908 Quality Way      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 6,730      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 4,493      
Improvements, Costs capitalized subsequent to acquisition 13,948      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,067      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 23,104      
Total 25,171      
Accumulated depreciation and amortization $ (18,441)      
904 Quality Way        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 904 Quality Way      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 760      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 744      
Improvements, Costs capitalized subsequent to acquisition 6,819      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,151      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 7,172      
Total 8,323      
Accumulated depreciation and amortization $ (1,194)      
1215 Integrity Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1215 Integrity Drive      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 69,836      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 995      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 68,841      
Total 69,836      
Accumulated depreciation and amortization $ (18,600)      
1350 Duane & 3080 Raymond        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1350 Duane & 3080 Raymond      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 7,081      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 69,817      
Improvements, Costs capitalized subsequent to acquisition 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 $ (16,611)      
45901 & 45845 Nokes Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 45901 & 45845 Nokes Boulevard      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 3,437      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 28,785      
Improvements, Costs capitalized subsequent to acquisition 450      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,437      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 29,235      
Total 32,672      
Accumulated depreciation and amortization $ (7,366)      
21561 & 21571 Beaumeade Circle        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 21561 & 21571 Beaumeade Circle      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 3,966      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 24,211      
Improvements, Costs capitalized subsequent to acquisition 45      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,966      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 24,256      
Total 28,222      
Accumulated depreciation and amortization $ (5,631)      
60 & 80 Merritt        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 60 & 80 Merritt      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 3,418      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 71,477      
Improvements, Costs capitalized subsequent to acquisition 97,152      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,418      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 168,629      
Total 172,047      
Accumulated depreciation and amortization $ (41,819)      
55 Middlesex        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 55 Middlesex      
Metropolitan Area Boston      
Encumbrances $ 0      
Land, Initial costs 9,975      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 68,363      
Improvements, Costs capitalized subsequent to acquisition 14,043      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 9,975      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 82,406      
Total 92,381      
Accumulated depreciation and amortization $ (25,924)      
128 First Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 128 First Avenue      
Metropolitan Area Boston      
Encumbrances $ 0      
Land, Initial costs 5,465      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 185,348      
Improvements, Costs capitalized subsequent to acquisition 37,493      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,465      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 222,841      
Total 228,306      
Accumulated depreciation and amortization $ (71,312)      
Cateringweg 5        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Cateringweg 5      
Metropolitan Area Amsterdam      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 3,518      
Buildings and improvements, Initial costs 3,517      
Improvements, Costs capitalized subsequent to acquisition 38,829      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 3,296      
Buildings and improvements, Total costs 42,568      
Total 45,864      
Accumulated depreciation and amortization $ (8,480)      
1725 Comstock Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1725 Comstock Street      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 3,274      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 6,567      
Improvements, Costs capitalized subsequent to acquisition 39,190      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,274      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 45,757      
Total 49,031      
Accumulated depreciation and amortization $ (25,913)      
3105 Alfred Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 3105 Alfred Street      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 6,533      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,725      
Improvements, Costs capitalized subsequent to acquisition 123,928      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,532      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 127,654      
Total 134,186      
Accumulated depreciation and amortization $ (31,190)      
365 Main Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 365 Main Street      
Metropolitan Area San Francisco      
Encumbrances $ 0      
Land, Initial costs 22,854      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 158,709      
Improvements, Costs capitalized subsequent to acquisition 29,725      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 22,854      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 188,434      
Total 211,288      
Accumulated depreciation and amortization $ (53,717)      
720 2nd Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 720 2nd Street      
Metropolitan Area San Francisco      
Encumbrances $ 0      
Land, Initial costs 3,884      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 116,861      
Improvements, Costs capitalized subsequent to acquisition 10,865      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,884      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 127,726      
Total 131,610      
Accumulated depreciation and amortization $ (33,071)      
2260 East El Segundo        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2260 East El Segundo      
Metropolitan Area Los Angeles      
Encumbrances $ 0      
Land, Initial costs 11,053      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 51,397      
Improvements, Costs capitalized subsequent to acquisition 15,774      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 11,053      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 67,171      
Total 78,224      
Accumulated depreciation and amortization $ (20,837)      
2121 South Price Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2121 South Price Road      
Metropolitan Area Phoenix      
Encumbrances $ 0      
Land, Initial costs 7,335      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 238,452      
Improvements, Costs capitalized subsequent to acquisition 213,355      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,335      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 451,807      
Total 459,142      
Accumulated depreciation and amortization $ (128,398)      
4030 Lafayette        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 4030 Lafayette      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 2,492      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 16,912      
Improvements, Costs capitalized subsequent to acquisition 10,372      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,492      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 27,284      
Total 29,776      
Accumulated depreciation and amortization $ (6,863)      
4040 Lafayette        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 4040 Lafayette      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 1,246      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 4,267      
Improvements, Costs capitalized subsequent to acquisition 24,717      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,246      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 28,984      
Total 30,230      
Accumulated depreciation and amortization $ (4,778)      
4050 Lafayette        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 4050 Lafayette      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 1,246      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 4,371      
Improvements, Costs capitalized subsequent to acquisition 35,994      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,246      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 40,365      
Total 41,611      
Accumulated depreciation and amortization $ (23,551)      
2805 Lafayette Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2805 Lafayette Street      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 8,976      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 18,155      
Improvements, Costs capitalized subsequent to acquisition 130,422      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 8,294      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 149,259      
Total 157,553      
Accumulated depreciation and amortization $ (31,988)      
29A International Business Park        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 29A International Business Park      
Metropolitan Area Singapore      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 137,545      
Improvements, Costs capitalized subsequent to acquisition 213,162      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 350,707      
Total 350,707      
Accumulated depreciation and amortization $ (128,018)      
43940 Digital Loudoun Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 43940 Digital Loudoun Plaza      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 6,229      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 284,883      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,524      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 283,588      
Total 291,112      
Accumulated depreciation and amortization $ (74,154)      
44060 Digital Loudoun Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 44060 Digital Loudoun Plaza      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 3,700      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 187,226      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,441      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 187,485      
Total 190,926      
Accumulated depreciation and amortization $ (24,690)      
44100 Digital Loudoun Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 44100 Digital Loudoun Plaza      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 3,700      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 140,869      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,493      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 141,076      
Total 144,569      
Accumulated depreciation and amortization $ (11,587)      
43780 Digital Loudoun Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 43780 Digital Loudoun Plaza      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 3,671      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 122,489      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,186      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 121,974      
Total 126,160      
Accumulated depreciation and amortization $ (6,976)      
1-11 Templar Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1-11 Templar Road      
Metropolitan Area Sydney      
Encumbrances $ 0      
Land, Initial costs 6,937      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 62,870      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,367      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 65,440      
Total 69,807      
Accumulated depreciation and amortization $ (15,816)      
13-23 Templar Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 13-23 Templar Road      
Metropolitan Area Sydney      
Land, Initial costs $ 4,236      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 68,074      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,530      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 68,780      
Total 72,310      
Accumulated depreciation and amortization $ (137)      
Fountain Court        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Fountain Court      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 7,544      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 12,506      
Improvements, Costs capitalized subsequent to acquisition 94,180      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,319      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 107,911      
Total 114,230      
Accumulated depreciation and amortization $ (24,250)      
72 Radnor Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 72 Radnor Drive      
Metropolitan Area Melbourne      
Encumbrances $ 0      
Land, Initial costs 2,568      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 66,203      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,749      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 67,022      
Total 68,771      
Accumulated depreciation and amortization $ (9,947)      
98 Radnor Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 98 Radnor Drive      
Metropolitan Area Melbourne      
Encumbrances $ 0      
Land, Initial costs 1,899      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 35,692      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,345      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 36,246      
Total 37,591      
Accumulated depreciation and amortization $ (15,159)      
105 Cabot Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 105 Cabot Street      
Metropolitan Area Boston      
Encumbrances $ 0      
Land, Initial costs 2,386      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 59,267      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,448      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 59,205      
Total 61,653      
Accumulated depreciation and amortization $ (9,257)      
3825 NW Aloclek Place        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 3825 NW Aloclek Place      
Metropolitan Area Portland      
Encumbrances $ 0      
Land, Initial costs 1,689      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 58,153      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,689      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 58,153      
Total 59,842      
Accumulated depreciation and amortization $ (21,249)      
Profile Park        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Profile Park      
Metropolitan Area Dublin      
Encumbrances $ 0      
Land, Initial costs 6,288      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 73,579      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 9,573      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 70,294      
Total 79,867      
Accumulated depreciation and amortization $ (3,982)      
760 Doug Davis Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 760 Doug Davis Drive      
Metropolitan Area Atlanta      
Encumbrances $ 0      
Land, Initial costs 4,837      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 53,551      
Improvements, Costs capitalized subsequent to acquisition 3,373      
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 $ (13,384)      
2501 S. State Hwy 121        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2501 S. State Hwy 121      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 23,137      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 93,943      
Improvements, Costs capitalized subsequent to acquisition 19,180      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 24,612      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 111,648      
Total 136,260      
Accumulated depreciation and amortization $ (31,141)      
9333 Grand Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 9333 Grand Avenue      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 5,686      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 14,515      
Improvements, Costs capitalized subsequent to acquisition 74,579      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,205      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 93,575      
Total 94,780      
Accumulated depreciation and amortization $ (34,196)      
9355 Grand Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 9355 Grand Avenue      
Metropolitan Area Chicago      
Encumbrances $ 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 227,902      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,518      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 225,384      
Total 227,902      
Accumulated depreciation and amortization $ (22,298)      
9377 Grand Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 9377 Grand Avenue      
Metropolitan Area Chicago      
Encumbrances $ 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 123,953      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,137      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 121,816      
Total 123,953      
Accumulated depreciation and amortization $ (3,683)      
850 E Collins        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 850 E Collins      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 1,614      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 85,337      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,614      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 85,337      
Total 86,951      
Accumulated depreciation and amortization $ (19,313)      
950 E Collins        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 950 E Collins      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 1,546      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 75,284      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,546      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 75,284      
Total 76,830      
Accumulated depreciation and amortization $ (12,178)      
400 S. Akard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 400 S. Akard      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 10,075      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 62,730      
Improvements, Costs capitalized subsequent to acquisition 2,657      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 10,075      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 65,387      
Total 75,462      
Accumulated depreciation and amortization $ (11,686)      
410 Commerce Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 410 Commerce Boulevard      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 30,212      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 30,212      
Total 30,212      
Accumulated depreciation and amortization $ (12,866)      
Croydon        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Croydon      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 1,683      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 104,728      
Improvements, Costs capitalized subsequent to acquisition 40,542      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,277      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 144,676      
Total 146,953      
Accumulated depreciation and amortization $ (26,060)      
Watford        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Watford      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 7,355      
Buildings and improvements, Initial costs 219,273      
Improvements, Costs capitalized subsequent to acquisition (6,852)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 6,247      
Buildings and improvements, Total costs 213,529      
Total 219,776      
Accumulated depreciation and amortization $ (39,423)      
Unit 21 Goldsworth Park        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Unit 21 Goldsworth Park      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 17,334      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 928,129      
Improvements, Costs capitalized subsequent to acquisition (159,279)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 12,735      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 773,449      
Total 786,184      
Accumulated depreciation and amortization $ (147,488)      
11900 East Cornell        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 11900 East Cornell      
Metropolitan Area Denver      
Encumbrances $ 0      
Land, Initial costs 3,352      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 80,640      
Improvements, Costs capitalized subsequent to acquisition 2,796      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,352      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 83,436      
Total 86,788      
Accumulated depreciation and amortization $ (17,330)      
701 Union Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 701 Union Boulevard      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 10,045      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 6,755      
Improvements, Costs capitalized subsequent to acquisition 25,274      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 42,074      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 0      
Total 42,074      
Accumulated depreciation and amortization $ 0      
23 Waterloo Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 23 Waterloo Road      
Metropolitan Area Sydney      
Encumbrances $ 0      
Land, Initial costs 7,112      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,868      
Improvements, Costs capitalized subsequent to acquisition (3,534)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,823      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 2,623      
Total 7,446      
Accumulated depreciation and amortization $ (436)      
1 Rue Jean-Pierre        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1 Rue Jean-Pierre      
Metropolitan Area Paris      
Encumbrances $ 0      
Land, Initial costs 9,621      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 35,825      
Improvements, Costs capitalized subsequent to acquisition (5,945)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 8,362      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 31,139      
Total 39,501      
Accumulated depreciation and amortization $ (6,777)      
Liet-dit le Christ de Saclay        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Liet-dit le Christ de Saclay      
Metropolitan Area Paris      
Encumbrances $ 0      
Land, Initial costs 3,402      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,090      
Improvements, Costs capitalized subsequent to acquisition (849)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,957      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 2,686      
Total 5,643      
Accumulated depreciation and amortization $ (754)      
127 Rue de Paris        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 127 Rue de Paris      
Metropolitan Area Paris      
Encumbrances $ 0      
Land, Initial costs 8,637      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 10,838      
Improvements, Costs capitalized subsequent to acquisition (2,548)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,507      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 9,420      
Total 16,927      
Accumulated depreciation and amortization $ (2,551)      
17201 Waterview Parkway        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 17201 Waterview Parkway      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 2,070      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 6,409      
Improvements, Costs capitalized subsequent to acquisition 42      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,070      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 6,451      
Total 8,521      
Accumulated depreciation and amortization $ (1,253)      
1900 S. Price Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1900 S. Price Road      
Metropolitan Area Phoenix      
Encumbrances $ 0      
Land, Initial costs 5,380      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 16,975      
Improvements, Costs capitalized subsequent to acquisition 982      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,512      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 17,825      
Total 23,337      
Accumulated depreciation and amortization $ (2,217)      
371 Gough Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 371 Gough Road      
Metropolitan Area Toronto      
Encumbrances $ 0      
Land, Initial costs 7,394      
Buildings and improvements, Initial costs 677      
Improvements, Costs capitalized subsequent to acquisition 87,318      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,560      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 89,829      
Total 95,389      
Accumulated depreciation and amortization $ (9,855)      
1500 Towerview Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1500 Towerview Road      
Metropolitan Area Minneapolis      
Encumbrances $ 0      
Land, Initial costs 10,190      
Buildings and improvements, Initial costs 20,054      
Improvements, Costs capitalized subsequent to acquisition 3,191      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 10,190      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 23,245      
Total 33,435      
Accumulated depreciation and amortization $ (4,857)      
Principal Park        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Principal Park      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 11,837      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 104,084      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 12,343      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 103,578      
Total 115,921      
Accumulated depreciation and amortization $ (9,625)      
Liverpoolweg 10        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Liverpoolweg 10      
Metropolitan Area Amsterdam      
Encumbrances $ 0      
Land, Initial costs 733      
Buildings and improvements, Initial costs 3,122      
Improvements, Costs capitalized subsequent to acquisition 9,730      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 644      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 12,941      
Total 13,585      
Accumulated depreciation and amortization $ (2,482)      
DePresident        
Real Estate and Accumulated Depreciation [Line Items]        
Properties DePresident      
Metropolitan Area Amsterdam      
Encumbrances $ 0      
Land, Initial costs 6,737      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 117,156      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,858      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 116,035      
Total 123,893      
Accumulated depreciation and amortization $ (2,506)      
Crawley 2        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Crawley 2      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 24,305      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 60,285      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 26,637      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 57,953      
Total 84,590      
Accumulated depreciation and amortization $ (463)      
Digital Deer Park 3        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Digital Deer Park 3      
Metropolitan Area Melbourne      
Encumbrances $ 0      
Land, Initial costs 1,600      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 3      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,603      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 0      
Total 1,603      
Accumulated depreciation and amortization $ 0      
3 Loyang Way        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 3 Loyang Way      
Metropolitan Area Singapore      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 168,365      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 168,365      
Total 168,365      
Accumulated depreciation and amortization $ (3,961)      
Digital Loudoun III        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Digital Loudoun III      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 43,000      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 572,790      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 60,358      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 555,432      
Total 615,790      
Accumulated depreciation and amortization $ (6,648)      
Digital Frankfurt        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Digital Frankfurt      
Metropolitan Area Frankfurt      
Encumbrances $ 0      
Land, Initial costs 5,543      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 101,172      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 9,987      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 96,728      
Total 106,715      
Accumulated depreciation and amortization $ (934)      
56 Marietta Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 56 Marietta Street      
Metropolitan Area Atlanta      
Encumbrances $ 0      
Land, Initial costs 1,700      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 211,397      
Improvements, Costs capitalized subsequent to acquisition 22,788      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,700      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 234,185      
Total 235,885      
Accumulated depreciation and amortization $ (30,981)      
2 Peekay Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2 Peekay Drive      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 115,439      
Improvements, Costs capitalized subsequent to acquisition 38,235      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 153,674      
Total 153,674      
Accumulated depreciation and amortization $ (25,011)      
100 Delawanna Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 100 Delawanna Avenue      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 3,600      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 85,438      
Improvements, Costs capitalized subsequent to acquisition 7,043      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,600      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 92,481      
Total 96,081      
Accumulated depreciation and amortization $ (10,686)      
60 Hudson Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 60 Hudson Street      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 32,280      
Improvements, Costs capitalized subsequent to acquisition 13,709      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 45,989      
Total 45,989      
Accumulated depreciation and amortization $ (12,278)      
32 Avenue of the Americas        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 32 Avenue of the Americas      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 30,980      
Improvements, Costs capitalized subsequent to acquisition 3,457      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 34,437      
Total 34,437      
Accumulated depreciation and amortization $ (8,693)      
3433 S 120th Place        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 3433 S 120th Place      
Metropolitan Area Seattle      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 11,688      
Improvements, Costs capitalized subsequent to acquisition 2,324      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 14,012      
Total 14,012      
Accumulated depreciation and amortization $ (4,818)      
8435 Stemmons Freeway        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 8435 Stemmons Freeway      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 5,023      
Improvements, Costs capitalized subsequent to acquisition 2,236      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 7,259      
Total 7,259      
Accumulated depreciation and amortization $ (2,097)      
2625 Walsh Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2625 Walsh Avenue      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 4,276      
Improvements, Costs capitalized subsequent to acquisition 7,768      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 12,044      
Total 12,044      
Accumulated depreciation and amortization $ (2,626)      
111 8th Avenue - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 111 8th Avenue - Telx      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 42,454      
Improvements, Costs capitalized subsequent to acquisition 14,422      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 56,876      
Total 56,876      
Accumulated depreciation and amortization $ (16,822)      
350 East Cermak Road - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 350 East Cermak Road - Telx      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 13,933      
Improvements, Costs capitalized subsequent to acquisition 8,163      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 22,096      
Total 22,096      
Accumulated depreciation and amortization $ (5,499)      
200 Paul Avenue - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 200 Paul Avenue - Telx      
Metropolitan Area San Francisco      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 6,719      
Improvements, Costs capitalized subsequent to acquisition 3,322      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 10,041      
Total 10,041      
Accumulated depreciation and amortization $ (2,750)      
2323 Bryan Street - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2323 Bryan Street - Telx      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 5,191      
Improvements, Costs capitalized subsequent to acquisition 3,770      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 8,961      
Total 8,961      
Accumulated depreciation and amortization $ (2,578)      
600 W. 7th Street - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 600 W. 7th Street - Telx      
Metropolitan Area Los Angeles      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,689      
Improvements, Costs capitalized subsequent to acquisition 5,096      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 8,785      
Total 8,785      
Accumulated depreciation and amortization $ (1,851)      
3825 NW Aloclek Place - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 3825 NW Aloclek Place - Telx      
Metropolitan Area Portland      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,131      
Improvements, Costs capitalized subsequent to acquisition 1,104      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 4,235      
Total 4,235      
Accumulated depreciation and amortization $ (1,316)      
120 E. Van Buren Street - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 120 E. Van Buren Street - Telx      
Metropolitan Area Phoenix      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 2,848      
Improvements, Costs capitalized subsequent to acquisition 2,407      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 5,255      
Total 5,255      
Accumulated depreciation and amortization $ (1,299)      
36 NE 2nd Street - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 36 NE 2nd Street - Telx      
Metropolitan Area Miami      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 1,842      
Improvements, Costs capitalized subsequent to acquisition 2,806      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 4,648      
Total 4,648      
Accumulated depreciation and amortization $ (1,238)      
600-780 S. Federal Street - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 600-780 S. Federal Street - Telx      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 1,815      
Improvements, Costs capitalized subsequent to acquisition 3,227      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 5,042      
Total 5,042      
Accumulated depreciation and amortization $ (1,035)      
113 N. Myers Street - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 113 N. Myers Street - Telx      
Metropolitan Area Charlotte      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 476      
Improvements, Costs capitalized subsequent to acquisition 746      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 1,222      
Total 1,222      
Accumulated depreciation and amortization $ (268)      
1100 Space Park Drive - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1100 Space Park Drive - Telx      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 352      
Improvements, Costs capitalized subsequent to acquisition 1,122      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 1,474      
Total 1,474      
Accumulated depreciation and amortization $ (233)      
300 Boulevard East - Telx        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 300 Boulevard East - Telx      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 197      
Improvements, Costs capitalized subsequent to acquisition 55      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 252      
Total 252      
Accumulated depreciation and amortization $ (139)      
Science Park        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Science Park      
Metropolitan Area Amsterdam      
Encumbrances $ 0      
Land, Initial costs 665      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 75,095      
Improvements, Costs capitalized subsequent to acquisition 22,517      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 693      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 97,584      
Total 98,277      
Accumulated depreciation and amortization $ (6,905)      
Sovereign House        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Sovereign House      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 7,943      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 75,184      
Improvements, Costs capitalized subsequent to acquisition 36,988      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 120,115      
Total 120,115      
Accumulated depreciation and amortization $ (12,253)      
Amstel Business Park        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Amstel Business Park      
Metropolitan Area Amsterdam      
Encumbrances $ 0      
Land, Initial costs 2,991      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 58,138      
Improvements, Costs capitalized subsequent to acquisition 14,086      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,096      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 72,119      
Total 75,215      
Accumulated depreciation and amortization $ (14,666)      
Olivers Yard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Olivers Yard      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 7,943      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 34,744      
Improvements, Costs capitalized subsequent to acquisition 1,353      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,780      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 36,260      
Total 44,040      
Accumulated depreciation and amortization $ (10,089)      
Bonnington House        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Bonnington House      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 14,127      
Improvements, Costs capitalized subsequent to acquisition 72,272      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 174      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 86,225      
Total 86,399      
Accumulated depreciation and amortization $ (2,805)      
West Drayton        
Real Estate and Accumulated Depreciation [Line Items]        
Properties West Drayton      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 10,135      
Improvements, Costs capitalized subsequent to acquisition 1,469      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 11,604      
Total 11,604      
Accumulated depreciation and amortization $ (4,750)      
Lyonerstrasse        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Lyonerstrasse      
Metropolitan Area Frankfurt      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 8,407      
Improvements, Costs capitalized subsequent to acquisition 3,140      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 11,547      
Total 11,547      
Accumulated depreciation and amortization $ (3,568)      
Meridian Gate        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Meridian Gate      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 5,893      
Improvements, Costs capitalized subsequent to acquisition 692      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 6,585      
Total 6,585      
Accumulated depreciation and amortization $ (2,538)      
NE Corner of Campbell Road and Ferris Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties NE Corner of Campbell Road and Ferris Road      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 21,902      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 795      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 22,685      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 12      
Total 22,697      
Accumulated depreciation and amortization $ 0      
9401 West Grand Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 9401 West Grand Avenue      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 12,500      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 89,688      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 17,363      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 84,825      
Total 102,188      
Accumulated depreciation and amortization $ 0      
Broad Run Technology Park        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Broad Run Technology Park      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 18,019      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 14,998      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 27,963      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 5,054      
Total 33,017      
Accumulated depreciation and amortization $ 0      
2425-2553 Edgington Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2425-2553 Edgington Street      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 11,950      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 1,615      
Improvements, Costs capitalized subsequent to acquisition 43      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 11,959      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 1,649      
Total 13,608      
Accumulated depreciation and amortization $ (99)      
44490 Chilum Place        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 44490 Chilum Place      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 4,180      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 76,745      
Improvements, Costs capitalized subsequent to acquisition 1,166      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,180      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 77,911      
Total 82,091      
Accumulated depreciation and amortization $ (6,086)      
44520 Hastings Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 44520 Hastings Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 104,000      
Land, Initial costs 6,140      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 108,105      
Improvements, Costs capitalized subsequent to acquisition 1,050      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,140      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 109,155      
Total 115,295      
Accumulated depreciation and amortization $ (8,271)      
44480 Hastings Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 44480 Hastings Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 12,860      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 278,384      
Improvements, Costs capitalized subsequent to acquisition 426      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 12,860      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 278,810      
Total 291,670      
Accumulated depreciation and amortization $ (21,536)      
44521 Hastings Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 44521 Hastings Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 13,210      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 315,539      
Improvements, Costs capitalized subsequent to acquisition 307      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 13,210      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 315,846      
Total 329,056      
Accumulated depreciation and amortization $ (24,425)      
44461 Chilum Place        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 44461 Chilum Place      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 9,620      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 249,371      
Improvements, Costs capitalized subsequent to acquisition 282      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 9,620      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 249,653      
Total 259,273      
Accumulated depreciation and amortization $ (19,418)      
21625 Gresham Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 21625 Gresham Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 17,500      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 448,968      
Improvements, Costs capitalized subsequent to acquisition 74      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 17,500      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 449,042      
Total 466,542      
Accumulated depreciation and amortization $ (35,066)      
21745 Sir Timothy Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 21745 Sir Timothy Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 16,010      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 289,281      
Improvements, Costs capitalized subsequent to acquisition 6,171      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 16,010      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 295,452      
Total 311,462      
Accumulated depreciation and amortization $ (17,418)      
21744 Sir Timothy Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 21744 Sir Timothy Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 10,523      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 50,411      
Improvements, Costs capitalized subsequent to acquisition 176,111      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 10,739      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 226,306      
Total 237,045      
Accumulated depreciation and amortization $ (4,924)      
2200 Busse Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2200 Busse Road      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 17,270      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 384,558      
Improvements, Costs capitalized subsequent to acquisition 1,251      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 17,270      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 385,809      
Total 403,079      
Accumulated depreciation and amortization $ (28,401)      
2299 Busse Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2299 Busse Road      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 12,780      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 348,348      
Improvements, Costs capitalized subsequent to acquisition (1,701)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 12,780      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 346,647      
Total 359,427      
Accumulated depreciation and amortization $ (26,551)      
1780 Business Center Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1780 Business Center Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 7,510      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 106,363      
Improvements, Costs capitalized subsequent to acquisition 353      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,510      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 106,716      
Total 114,226      
Accumulated depreciation and amortization $ (7,275)      
8217 Linton Hall Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 8217 Linton Hall Road      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 22,340      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 81,985      
Improvements, Costs capitalized subsequent to acquisition 343      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 22,340      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 82,328      
Total 104,668      
Accumulated depreciation and amortization $ (5,266)      
1400 East Devon Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1400 East Devon Avenue      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 11,012      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 178,627      
Improvements, Costs capitalized subsequent to acquisition 60,449      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 11,261      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 238,827      
Total 250,088      
Accumulated depreciation and amortization $ (6,732)      
2220 De La Cruz Blvd        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2220 De La Cruz Blvd      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 84,650      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 634,007      
Improvements, Costs capitalized subsequent to acquisition 2,038      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 84,650      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 636,045      
Total 720,695      
Accumulated depreciation and amortization $ (43,502)      
1 Century Place        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1 Century Place      
Metropolitan Area Toronto      
Encumbrances $ 0      
Land, Initial costs 26,600      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 116,863      
Improvements, Costs capitalized subsequent to acquisition 67,153      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 25,557      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 185,059      
Total 210,616      
Accumulated depreciation and amortization $ (1,001)      
505 North Railroad Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 505 North Railroad Avenue      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 20,431      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 245,810      
Improvements, Costs capitalized subsequent to acquisition 983      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 16,513      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 250,711      
Total 267,224      
Accumulated depreciation and amortization $ (6,441)      
250 Williams        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 250 Williams      
Metropolitan Area Atlanta      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 24,088      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 24,088      
Total 24,088      
Accumulated depreciation and amortization $ (3,102)      
CME Agreement        
Real Estate and Accumulated Depreciation [Line Items]        
Properties CME Agreement      
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 41,478      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 41,478      
Total 41,478      
Accumulated depreciation and amortization $ (14,659)      
Osaka 2        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Osaka 2      
Metropolitan Area Osaka      
Encumbrances $ 0      
Land, Initial costs 13,593      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 104,994      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 15,489      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 103,098      
Total 118,587      
Accumulated depreciation and amortization $ 0      
Osaka 3        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Osaka 3      
Metropolitan Area Osaka      
Encumbrances $ 0      
Land, Initial costs 4,713      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 249      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,962      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 0      
Total 4,962      
Accumulated depreciation and amortization $ 0      
De President II        
Real Estate and Accumulated Depreciation [Line Items]        
Properties De President II      
Metropolitan Area Amsterdam      
Encumbrances $ 0      
Land, Initial costs 6,315      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 2,905      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,095      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 2,125      
Total 9,220      
Accumulated depreciation and amortization $ 0      
Development Property -- N. Virginia        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Development Property -- N. Virginia      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 16,200      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 573      
Improvements, Costs capitalized subsequent to acquisition 267      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 17,026      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 14      
Total 17,040      
Accumulated depreciation and amortization $ (2)      
Development Property -- Portland        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Development Property -- Portland      
Metropolitan Area Portland      
Encumbrances $ 0      
Land, Initial costs 11,672      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 5,924      
Improvements, Costs capitalized subsequent to acquisition 8,798      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 12,179      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 14,215      
Total 26,394      
Accumulated depreciation and amortization $ (1)      
Development Property -- Phoenix        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Development Property -- Phoenix      
Metropolitan Area Phoenix      
Encumbrances $ 0      
Land, Initial costs 12,500      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 732      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 12,998      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 234      
Total 13,232      
Accumulated depreciation and amortization $ (1)      
330 E. Cermak Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 330 E. Cermak Road      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 25,248      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition (1)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 25,247      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 0      
Total 25,247      
Accumulated depreciation and amortization $ 0      
10000-10006 Godwin Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 10000-10006 Godwin Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 17,308      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 2,990      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 18,239      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 2,059      
Total 20,298      
Accumulated depreciation and amortization $ 0      
2825-2845 Lafayette Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2825-2845 Lafayette Street      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 56,000      
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 56,000      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 3,001      
Total 59,001      
Accumulated depreciation and amortization $ (1,574)      
9905 Godwin Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 9905 Godwin Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 5,819      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 1,583      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,402      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 0      
Total 7,402      
Accumulated depreciation and amortization $ 0      
Pacific Boulevard and S. Sterling Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Pacific Boulevard and S. Sterling Boulevard      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 27,139      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 1,073      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 28,145      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 67      
Total 28,212      
Accumulated depreciation and amortization $ 0      
160 Lockwood Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 160 Lockwood Road      
Metropolitan Area Sydney      
Encumbrances $ 0      
Land, Initial costs 7,664      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 54      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,718      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 0      
Total 7,718      
Accumulated depreciation and amortization $ 0      
Western Lands        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Western Lands      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 238,141      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 1,694      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 239,835      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 0      
Total 239,835      
Accumulated depreciation and amortization $ 0      
Osaka 4        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Osaka 4      
Metropolitan Area Osaka      
Encumbrances $ 0      
Land, Initial costs 4,633      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 140      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,773      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 0      
Total 4,773      
Accumulated depreciation and amortization $ 0      
Ascenty        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Ascenty      
Metropolitan Area Brazil      
Encumbrances $ 600,000      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 425,000      
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 425,000      
Total 425,000      
Accumulated depreciation and amortization $ 0      
Other        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Other      
Encumbrances $ 0      
Land, Initial costs 8,298      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 61,236      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 69,534      
Total 69,534      
Accumulated depreciation and amortization $ (11,510)