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Schedule III Properties And Accumulated Depreciation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 2,916      
Land, Initial costs 786,205      
Acquired ground lease, Initial costs 14,986      
Buildings and improvements, Initial costs 5,231,322      
Improvements, Costs capitalized subsequent to acquisition 5,525,956      
Carry costs, Costs capitalized subsequent to acquisition (5,900)      
Land, Total costs 746,822      
Acquired ground lease, Total costs 11,335      
Buildings and improvements, Total costs 10,800,312      
Total 11,558,469 $ 10,915,373 $ 9,982,612 $ 9,879,578
Accumulated depreciation and amortization $ (2,668,509) $ (2,251,268) $ (1,874,054) $ (1,565,996)
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 12,246      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,942      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 36,430      
Total 38,372      
Accumulated depreciation and amortization $ (15,119)      
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 49,960      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,838      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 127,564      
Total 129,402      
Accumulated depreciation and amortization $ (60,995)      
300 Boulevard East        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 300 Boulevard East      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 5,140      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 48,526      
Improvements, Costs capitalized subsequent to acquisition 61,695      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,140      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 110,221      
Total 115,361      
Accumulated depreciation and amortization $ (61,473)      
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 $ (9,739)      
34551 Ardenwood Boulevard 1-4        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 34551 Ardenwood Boulevard 1-4      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 15,330      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 32,419      
Improvements, Costs capitalized subsequent to acquisition 10,583      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 15,330      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 43,002      
Total 58,332      
Accumulated depreciation and amortization $ (16,861)      
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 72,349      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,477      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 82,679      
Total 84,156      
Accumulated depreciation and amortization $ (55,085)      
2010 East Centennial Circle        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2010 East Centennial Circle      
Metropolitan Area Phoenix      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 1,477      
Buildings and improvements, Initial costs 16,472      
Improvements, Costs capitalized subsequent to acquisition (98)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 1,322      
Buildings and improvements, Total costs 16,529      
Total 17,851      
Accumulated depreciation and amortization $ (6,963)      
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 31,541      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,250      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 43,119      
Total 44,369      
Accumulated depreciation and amortization $ (26,328)      
4849 Alpha Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 4849 Alpha Road      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 2,983      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 10,650      
Improvements, Costs capitalized subsequent to acquisition 43,322      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,983      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 53,972      
Total 56,955      
Accumulated depreciation and amortization $ (25,219)      
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 56,357      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 18,478      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 107,181      
Total 125,659      
Accumulated depreciation and amortization $ (58,833)      
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 20      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,065      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 43,837      
Total 49,902      
Accumulated depreciation and amortization $ (17,228)      
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 2,345      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,881      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 36,818      
Total 42,699      
Accumulated depreciation and amortization $ (15,353)      
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 $ (11,735)      
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 93,524      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 14,427      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 169,301      
Total 183,728      
Accumulated depreciation and amortization $ (72,412)      
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 34,917      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,130      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 53,123      
Total 58,253      
Accumulated depreciation and amortization $ (29,167)      
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 $ (3,462)      
1125 Energy Park Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1125 Energy Park Drive      
Metropolitan Area Minneapolis      
Encumbrances $ 0      
Land, Initial costs 2,775      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 10,761      
Improvements, Costs capitalized subsequent to acquisition (5,701)      
Carry costs, Costs capitalized subsequent to acquisition (5,900)      
Land, Total costs 2,775      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 5,060      
Total 7,835      
Accumulated depreciation and amortization $ (3,945)      
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 224,747      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 8,620      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 327,825      
Total 336,445      
Accumulated depreciation and amortization $ (185,776)      
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 138      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,181      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 11,699      
Total 13,880      
Accumulated depreciation and amortization $ (4,862)      
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 $ (7,589)      
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 $ (4,908)      
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 $ (5,809)      
731 East Trade Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 731 East Trade Street      
Metropolitan Area Charlotte      
Encumbrances $ 2,916      
Land, Initial costs 1,748      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 5,727      
Improvements, Costs capitalized subsequent to acquisition 257      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,748      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 5,984      
Total 7,732      
Accumulated depreciation and amortization (2,233)      
Unamortized net premiums $ 334      
113 North Myers        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 113 North Myers      
Metropolitan Area Charlotte      
Encumbrances $ 0      
Land, Initial costs 1,098      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,127      
Improvements, Costs capitalized subsequent to acquisition 2,069      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,098      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 5,196      
Total 6,294      
Accumulated depreciation and amortization $ (2,186)      
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 6,180      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,271      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 9,918      
Total 11,189      
Accumulated depreciation and amortization $ (7,186)      
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 22,772      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 38,027      
Total 38,027      
Accumulated depreciation and amortization $ (14,472)      
600-780 S. Federal        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 600-780 S. Federal      
Metropolitan Area Chicago      
Encumbrances $ 0      
Land, Initial costs 7,849      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 27,881      
Improvements, Costs capitalized subsequent to acquisition 33,802      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,849      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 61,683      
Total 69,532      
Accumulated depreciation and amortization $ (15,304)      
115 Second Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 115 Second Avenue      
Metropolitan Area Boston      
Encumbrances $ 0      
Land, Initial costs 1,691      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 12,569      
Improvements, Costs capitalized subsequent to acquisition 11,458      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,691      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 24,027      
Total 25,718      
Accumulated depreciation and amortization $ (14,222)      
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 (2,171)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 17,900      
Total 17,900      
Accumulated depreciation and amortization $ (6,585)      
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 68,296      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,177      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 73,173      
Total 74,350      
Accumulated depreciation and amortization $ (8,207)      
3 Corporate Place        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 3 Corporate Place      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 1,543      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 12,678      
Improvements, Costs capitalized subsequent to acquisition 85,251      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,543      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 97,929      
Total 99,472      
Accumulated depreciation and amortization $ (76,002)      
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 42,222      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 581      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 42,222      
Total 42,803      
Accumulated depreciation and amortization $ 0      
4025 Midway Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 4025 Midway Road      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 2,196      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 14,037      
Improvements, Costs capitalized subsequent to acquisition 28,773      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,196      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 42,810      
Total 45,006      
Accumulated depreciation and amortization $ (27,510)      
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 963      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 87      
Buildings and improvements, Total costs 7,889      
Total 7,976      
Accumulated depreciation and amortization $ (4,804)      
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 2,279      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,657      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 13,631      
Total 15,288      
Accumulated depreciation and amortization $ (5,904)      
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 45      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,480      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 34,842      
Total 36,322      
Accumulated depreciation and amortization $ (12,631)      
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 145,603      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,965      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 169,095      
Total 176,060      
Accumulated depreciation and amortization $ (46,323)      
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 109,068      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,524      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 266,890      
Total 271,414      
Accumulated depreciation and amortization $ (115,072)      
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 (2,374)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 11,076      
Total 11,076      
Accumulated depreciation and amortization $ (4,168)      
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 72,561      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 72,561      
Total 72,561      
Accumulated depreciation and amortization $ (35,184)      
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 $ (2,134)      
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 $ (1,568)      
2055 East Technology Circle        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2055 East Technology Circle      
Metropolitan Area Phoenix      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 8,519      
Improvements, Costs capitalized subsequent to acquisition 27,622      
Carry costs, Costs capitalized subsequent to acquisition 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 36,141      
Total 36,141      
Accumulated depreciation and amortization $ (24,871)      
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 14,822      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,523      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 55,250      
Total 56,773      
Accumulated depreciation and amortization $ (18,759)      
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 18,687      
Carry costs, Costs capitalized subsequent to acquisition 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 36,375      
Total 36,375      
Accumulated depreciation and amortization $ (28,345)      
8100 Boone Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 8100 Boone Boulevard      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 158      
Improvements, Costs capitalized subsequent to acquisition 1,211      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 1,369      
Total 1,369      
Accumulated depreciation and amortization $ (1,200)      
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 $ (5,246)      
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 49,447      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,354      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 59,752      
Total 63,106      
Accumulated depreciation and amortization $ (44,952)      
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 $ (10,092)      
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 92,840      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,653      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 116,471      
Total 121,124      
Accumulated depreciation and amortization $ (80,752)      
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 1,366      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,027      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 17,613      
Total 20,640      
Accumulated depreciation and amortization $ (5,181)      
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 76,648      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,490      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 94,092      
Total 97,582      
Accumulated depreciation and amortization $ (46,167)      
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 38,956      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 19,670      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 50,640      
Total 70,310      
Accumulated depreciation and amortization $ (10,514)      
1 Solutions Parkway        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1 Solutions Parkway      
Metropolitan Area St. Louis      
Encumbrances $ 0      
Land, Initial costs 3,301      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 20,639      
Improvements, Costs capitalized subsequent to acquisition 1,460      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,301      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 22,099      
Total 25,400      
Accumulated depreciation and amortization $ (6,304)      
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 46,136      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,106      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 55,087      
Total 59,193      
Accumulated depreciation and amortization $ (45,440)      
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 17,681      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,372      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 27,974      
Total 30,346      
Accumulated depreciation and amortization $ (15,888)      
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 (6,745)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 860      
Buildings and improvements, Total costs 17,028      
Total 17,888      
Accumulated depreciation and amortization $ (4,643)      
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 (860)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 944      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 731      
Total 1,675      
Accumulated depreciation and amortization $ (168)      
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 31,421      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 629      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 32,409      
Total 33,038      
Accumulated depreciation and amortization $ (4,463)      
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 74,745      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 13,870      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 99,305      
Total 113,175      
Accumulated depreciation and amortization $ (43,075)      
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 285,554      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,019      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 302,958      
Total 305,977      
Accumulated depreciation and amortization $ (90,405)      
701 & 717 Leonard Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 701 & 717 Leonard Street      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 2,165      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 9,934      
Improvements, Costs capitalized subsequent to acquisition 835      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,165      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 10,769      
Total 12,934      
Accumulated depreciation and amortization $ (2,563)      
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 (8,672)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 15,246      
Total 15,246      
Accumulated depreciation and amortization $ (3,720)      
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 26,767      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,398      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 27,068      
Total 30,466      
Accumulated depreciation and amortization $ (16,276)      
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 2,625      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,056      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 3,636      
Total 5,692      
Accumulated depreciation and amortization $ 0      
1525 Comstock Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1525 Comstock Street      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 2,293      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 16,216      
Improvements, Costs capitalized subsequent to acquisition 30,780      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,061      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 47,228      
Total 49,289      
Accumulated depreciation and amortization $ (27,042)      
43830 Devin Shafron Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 43830 Devin Shafron Drive      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 5,509      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 73,667      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,509      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 73,667      
Total 79,176      
Accumulated depreciation and amortization $ (30,048)      
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 63,893      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,266      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 67,634      
Total 69,900      
Accumulated depreciation and amortization $ (32,135)      
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 69,396      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,446      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 71,055      
Total 72,501      
Accumulated depreciation and amortization $ (13,853)      
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 100,985      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,796      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 102,619      
Total 106,415      
Accumulated depreciation and amortization $ (29)      
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 98,890      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,112      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 97,455      
Total 99,567      
Accumulated depreciation and amortization $ (2,790)      
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 13,778      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,067      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 22,934      
Total 25,001      
Accumulated depreciation and amortization $ (15,103)      
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 6,818      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,151      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 7,171      
Total 8,322      
Accumulated depreciation and amortization $ (814)      
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 44,353      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,921      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 42,432      
Total 44,353      
Accumulated depreciation and amortization $ (11,315)      
1350 Duane & 3080 Raymond        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1350 Duane & 3080 Raymond      
Metropolitan Area Silicon Valley      
Encumbrances $ 0      
Land, Initial costs 7,081      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 69,817      
Improvements, Costs capitalized subsequent to acquisition 61      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,081      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 69,878      
Total 76,959      
Accumulated depreciation and amortization $ (12,978)      
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 $ (5,737)      
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 $ (4,389)      
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 92,086      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,418      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 163,563      
Total 166,981      
Accumulated depreciation and amortization $ (28,851)      
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 8,793      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 9,975      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 77,156      
Total 87,131      
Accumulated depreciation and amortization $ (19,299)      
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 31,509      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,465      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 216,857      
Total 222,322      
Accumulated depreciation and amortization $ (53,084)      
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 35,249      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 3,023      
Buildings and improvements, Total costs 39,261      
Total 42,284      
Accumulated depreciation and amortization $ (5,866)      
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 38,002      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,274      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 44,569      
Total 47,843      
Accumulated depreciation and amortization $ (19,201)      
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 58,227      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,801      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 61,684      
Total 68,485      
Accumulated depreciation and amortization $ (22,043)      
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 23,962      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 22,854      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 182,671      
Total 205,525      
Accumulated depreciation and amortization $ (40,034)      
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 9,644      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,884      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 126,505      
Total 130,389      
Accumulated depreciation and amortization $ (24,909)      
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 14,310      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 11,053      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 65,707      
Total 76,760      
Accumulated depreciation and amortization $ (15,223)      
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 203,628      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,335      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 442,080      
Total 449,415      
Accumulated depreciation and amortization $ (88,460)      
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 3,871      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,492      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 20,783      
Total 23,275      
Accumulated depreciation and amortization $ (4,646)      
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 24,510      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,246      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 28,777      
Total 30,023      
Accumulated depreciation and amortization $ (2,762)      
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 35,110      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,246      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 39,481      
Total 40,727      
Accumulated depreciation and amortization $ (16,862)      
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 128,065      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 8,294      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 146,902      
Total 155,196      
Accumulated depreciation and amortization $ (17,415)      
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 190,103      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 327,648      
Total 327,648      
Accumulated depreciation and amortization $ (76,738)      
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 255,687      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,323      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 255,593      
Total 261,916      
Accumulated depreciation and amortization $ (42,870)      
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 187,637      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,441      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 187,896      
Total 191,337      
Accumulated depreciation and amortization $ (10,721)      
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 128,634      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,750      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 128,584      
Total 132,334      
Accumulated depreciation and amortization $ (1,139)      
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 52,214      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,633      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 51,252      
Total 55,885      
Accumulated depreciation and amortization $ (139)      
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 62,024      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,550      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 64,411      
Total 68,961      
Accumulated depreciation and amortization $ (9,346)      
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 426      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,424      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 1,238      
Total 4,662      
Accumulated depreciation and amortization $ 0      
Fountain Court        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Fountain Court      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 7,544      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 12,506      
Improvements, Costs capitalized subsequent to acquisition 90,541      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,145      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 104,446      
Total 110,591      
Accumulated depreciation and amortization $ (12,647)      
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 53,962      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,805      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 54,725      
Total 56,530      
Accumulated depreciation and amortization $ (5,163)      
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 36,164      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,375      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 36,688      
Total 38,063      
Accumulated depreciation and amortization $ (10,242)      
105 Cabot Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 105 Cabot Street      
Metropolitan Area Boston      
Encumbrances $ 0      
Land, Initial costs 2,386      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 58,844      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,427      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 58,803      
Total 61,230      
Accumulated depreciation and amortization $ (5,502)      
3825 NW Aloclek Place        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 3825 NW Aloclek Place      
Metropolitan Area Portland      
Encumbrances $ 0      
Land, Initial costs 1,689      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 57,103      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,689      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 57,103      
Total 58,792      
Accumulated depreciation and amortization $ (14,163)      
11085 Sun Center Drive        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 11085 Sun Center Drive      
Metropolitan Area Sacramento      
Encumbrances $ 0      
Land, Initial costs 2,490      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 21,509      
Improvements, Costs capitalized subsequent to acquisition 1      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,490      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 21,510      
Total 24,000      
Accumulated depreciation and amortization $ (3,253)      
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 39,505      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,205      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 40,588      
Total 45,793      
Accumulated depreciation and amortization $ (1,321)      
1506 & 44874 Moran Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1506 & 44874 Moran Road      
Metropolitan Area N. Virginia      
Encumbrances $ 0      
Land, Initial costs 1,527      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 17,185      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,115      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 17,597      
Total 18,712      
Accumulated depreciation and amortization $ (1,800)      
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 3,086      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,837      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 56,637      
Total 61,474      
Accumulated depreciation and amortization $ (9,862)      
360 Spear Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 360 Spear Street      
Metropolitan Area San Francisco      
Encumbrances $ 0      
Land, Initial costs 19,828      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 56,733      
Improvements, Costs capitalized subsequent to acquisition (771)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 19,828      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 55,962      
Total 75,790      
Accumulated depreciation and amortization $ (10,532)      
2501 S. State Hwy 121        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 2501 S. State Hwy 121      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 23,137      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 93,943      
Improvements, Costs capitalized subsequent to acquisition 17,189      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 23,137      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 111,132      
Total 134,269      
Accumulated depreciation and amortization $ (22,488)      
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 76,939      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,205      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 95,935      
Total 97,140      
Accumulated depreciation and amortization $ (21,486)      
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 224,912      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,518      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 222,394      
Total 224,912      
Accumulated depreciation and amortization $ (7,330)      
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 75,821      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,248      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 73,573      
Total 75,821      
Accumulated depreciation and amortization $ (38)      
8025 North Interstate 35        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 8025 North Interstate 35      
Metropolitan Area Austin      
Encumbrances $ 0      
Land, Initial costs 2,920      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 8,512      
Improvements, Costs capitalized subsequent to acquisition 185      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,920      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 8,697      
Total 11,617      
Accumulated depreciation and amortization $ (1,305)      
850 E Collins        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 850 E Collins      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 1,614      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 83,041      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,614      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 83,041      
Total 84,655      
Accumulated depreciation and amortization $ (10,903)      
950 E Collins        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 950 E Collins      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 1,546      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 74,874      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,546      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 74,874      
Total 76,420      
Accumulated depreciation and amortization $ (6,421)      
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 1,902      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 10,075      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 64,632      
Total 74,707      
Accumulated depreciation and amortization $ (7,910)      
410 Commerce Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 410 Commerce Boulevard      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 29,784      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 29,784      
Total 29,784      
Accumulated depreciation and amortization $ (8,027)      
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 34,197      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,203      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 138,405      
Total 140,608      
Accumulated depreciation and amortization $ (17,161)      
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 (15,784)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 6,043      
Buildings and improvements, Total costs 204,801      
Total 210,844      
Accumulated depreciation and amortization $ (24,862)      
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 (218,845)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 12,327      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 714,291      
Total 726,618      
Accumulated depreciation and amortization $ (93,086)      
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 2,059      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,352      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 82,699      
Total 86,051      
Accumulated depreciation and amortization $ (11,645)      
701 Union Boulevard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 701 Union Boulevard      
Metropolitan Area New York      
Encumbrances $ 0      
Land, Initial costs 10,045      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 6,755      
Improvements, Costs capitalized subsequent to acquisition 26,299      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 10,045      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 33,054      
Total 43,099      
Accumulated depreciation and amortization $ 0      
23 Waterloo Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 23 Waterloo Road      
Metropolitan Area Sydney      
Encumbrances $ 0      
Land, Initial costs 7,112      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 3,868      
Improvements, Costs capitalized subsequent to acquisition (3,366)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 4,932      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 2,682      
Total 7,614      
Accumulated depreciation and amortization $ (310)      
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 (9,218)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,669      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 28,559      
Total 36,228      
Accumulated depreciation and amortization $ (4,143)      
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 (1,317)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,712      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 2,463      
Total 5,175      
Accumulated depreciation and amortization $ (461)      
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 (3,950)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,886      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 8,639      
Total 15,525      
Accumulated depreciation and amortization $ (1,559)      
17201 Waterview Parkway        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 17201 Waterview Parkway      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 2,070      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 6,409      
Improvements, Costs capitalized subsequent to acquisition (1)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,070      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 6,408      
Total 8,478      
Accumulated depreciation and amortization $ (825)      
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 486      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 5,398      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 17,443      
Total 22,841      
Accumulated depreciation and amortization $ (1,815)      
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 88,306      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 6,014      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 90,363      
Total 96,377      
Accumulated depreciation and amortization $ (4,305)      
1500 Towerview Road        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 1500 Towerview Road      
Metropolitan Area Minneapolis      
Encumbrances $ 0      
Land, Initial costs 10,190      
Buildings and improvements, Initial costs 20,054      
Improvements, Costs capitalized subsequent to acquisition 3,191      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 10,190      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 23,245      
Total 33,435      
Accumulated depreciation and amortization $ (3,029)      
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 101,915      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 12,044      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 101,708      
Total 113,752      
Accumulated depreciation and amortization $ (3,890)      
MetCenter Business Park        
Real Estate and Accumulated Depreciation [Line Items]        
Properties MetCenter Business Park      
Metropolitan Area Austin      
Encumbrances $ 0      
Land, Initial costs 8,604      
Buildings and improvements, Initial costs 20,314      
Improvements, Costs capitalized subsequent to acquisition 395      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 8,604      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 20,709      
Total 29,313      
Accumulated depreciation and amortization $ (3,043)      
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 8,138      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 591      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 11,402      
Total 11,993      
Accumulated depreciation and amortization $ (1,183)      
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 30,369      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,030      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 30,076      
Total 37,106      
Accumulated depreciation and amortization $ 0      
Digital Osaka        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Digital Osaka      
Metropolitan Area Osaka      
Encumbrances $ 0      
Land, Initial costs 9,649      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 43,689      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 9,043      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 44,295      
Total 53,338      
Accumulated depreciation and amortization $ 0      
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 1,227      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 18,502      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 7,030      
Total 25,532      
Accumulated depreciation and amortization $ (190)      
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 32      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,630      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 2      
Total 1,632      
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 110,303      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 110,303      
Total 110,303      
Accumulated depreciation and amortization $ (320)      
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 26,278      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 51,673      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 17,605      
Total 69,278      
Accumulated depreciation and amortization $ (10)      
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 7,884      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 8,266      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 5,161      
Total 13,427      
Accumulated depreciation and amortization $ 0      
56 Marietta Street        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 56 Marietta Street      
Metropolitan Area Atlanta      
Encumbrances $ 0      
Land, Initial costs 1,700      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 211,397      
Improvements, Costs capitalized subsequent to acquisition 7,329      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 1,700      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 218,726      
Total 220,426      
Accumulated depreciation and amortization $ (10,882)      
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 5,072      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 120,511      
Total 120,511      
Accumulated depreciation and amortization $ (8,637)      
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 3,400      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 3,600      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 88,838      
Total 92,438      
Accumulated depreciation and amortization $ (3,985)      
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 4,249      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 36,529      
Total 36,529      
Accumulated depreciation and amortization $ (4,064)      
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 1,368      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 32,348      
Total 32,348      
Accumulated depreciation and amortization $ (2,765)      
3433 S 120th Place        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 3433 S 120th Place      
Metropolitan Area Seattle      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 11,688      
Improvements, Costs capitalized subsequent to acquisition 1,387      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 13,075      
Total 13,075      
Accumulated depreciation and amortization $ (2,074)      
8435 Stemmons Freeway        
Real Estate and Accumulated Depreciation [Line Items]        
Properties 8435 Stemmons Freeway      
Metropolitan Area Dallas      
Encumbrances $ 0      
Land, Initial costs 0      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 5,023      
Improvements, Costs capitalized subsequent to acquisition 1,425      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 6,448      
Total 6,448      
Accumulated depreciation and amortization $ (841)      
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 2,648      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 6,924      
Total 6,924      
Accumulated depreciation and amortization $ (550)      
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 5,433      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 47,887      
Total 47,887      
Accumulated depreciation and amortization $ (6,506)      
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 2,180      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 16,113      
Total 16,113      
Accumulated depreciation and amortization $ (1,749)      
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 1,160      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 7,879      
Total 7,879      
Accumulated depreciation and amortization $ (958)      
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 1,725      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 6,916      
Total 6,916      
Accumulated depreciation and amortization $ (853)      
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 498      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 4,187      
Total 4,187      
Accumulated depreciation and amortization $ (506)      
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 835      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 3,966      
Total 3,966      
Accumulated depreciation and amortization $ (364)      
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 765      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 3,613      
Total 3,613      
Accumulated depreciation and amortization $ (383)      
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 649      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 2,491      
Total 2,491      
Accumulated depreciation and amortization $ (353)      
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 1,682      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 3,497      
Total 3,497      
Accumulated depreciation and amortization $ (293)      
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 40      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 516      
Total 516      
Accumulated depreciation and amortization $ (75)      
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 109      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 461      
Total 461      
Accumulated depreciation and amortization $ (61)      
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 25      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 222      
Total 222      
Accumulated depreciation and amortization $ (57)      
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 15,671      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 631      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 90,800      
Total 91,431      
Accumulated depreciation and amortization $ (903)      
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 44,114      
Improvements, Costs capitalized subsequent to acquisition (2,095)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,527      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 42,435      
Total 49,962      
Accumulated depreciation and amortization $ (2,188)      
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 2,184      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 2,840      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 60,473      
Total 63,313      
Accumulated depreciation and amortization $ (2,587)      
Olivers Yard        
Real Estate and Accumulated Depreciation [Line Items]        
Properties Olivers Yard      
Metropolitan Area London      
Encumbrances $ 0      
Land, Initial costs 7,943      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 34,744      
Improvements, Costs capitalized subsequent to acquisition (2,099)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 7,527      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 33,061      
Total 40,588      
Accumulated depreciation and amortization $ (1,782)      
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 (252)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 13,875      
Total 13,875      
Accumulated depreciation and amortization $ (1,094)      
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 (330)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 9,805      
Total 9,805      
Accumulated depreciation and amortization $ (832)      
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 (393)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 8,014      
Total 8,014      
Accumulated depreciation and amortization $ (586)      
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 (255)      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 5,638      
Total 5,638      
Accumulated depreciation and amortization $ (445)      
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 16,542      
Acquired ground lease, Initial costs 0      
Buildings and improvements, Initial costs 0      
Improvements, Costs capitalized subsequent to acquisition 230      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 16,772      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 0      
Total 16,772      
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 973      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 13,430      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 43      
Total 13,473      
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 5,422      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 23,314      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 127      
Total 23,441      
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 94,343      
Carry costs, Costs capitalized subsequent to acquisition 0      
Land, Total costs 0      
Acquired ground lease, Total costs 0      
Buildings and improvements, Total costs 102,641      
Total 102,641      
Accumulated depreciation and amortization $ (14,485)