Annual report pursuant to Section 13 and 15(d)

Schedule III - Real Estate and Accumulated Depreciation (Detail)

v3.8.0.1
Schedule III - Real Estate and Accumulated Depreciation (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 452,491      
Land, initial cost 123,987      
Buildings & improvements, initial cost 731,930      
Improvement costs capitalized subsequent to acquisition 50,933      
Land, total cost 123,323      
Buildings & improvements, total cost 783,527      
Total 906,850 $ 833,203 $ 782,276 $ 722,565
Accumulated depreciation 153,387 $ 134,329 $ 113,089 $ 92,133
Net real estate 753,463      
Raleigh, North Carolina Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost 0      
Land, initial cost 960      
Buildings & improvements, initial cost 4,481      
Improvement costs capitalized subsequent to acquisition 35      
Land, total cost 960      
Buildings & improvements, total cost 4,516      
Total 5,476      
Accumulated depreciation 2,090      
Net real estate $ 3,386      
Year construction/ improvements 1997      
Date acquired Dec. 23, 2003      
Canton, Ohio Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 1,574      
Land, initial cost 186      
Buildings & improvements, initial cost 3,083      
Improvement costs capitalized subsequent to acquisition 500      
Land, total cost 187      
Buildings & improvements, total cost 3,582      
Total 3,769      
Accumulated depreciation 1,325      
Net real estate $ 2,444      
Year construction/ improvements 1994      
Date acquired Jan. 30, 2004      
Akron, Ohio Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 1,973      
Buildings & improvements, initial cost 6,771      
Improvement costs capitalized subsequent to acquisition 1,658      
Land, total cost 1,974      
Buildings & improvements, total cost 8,428      
Total 10,402      
Accumulated depreciation 2,628      
Net real estate $ 7,774      
Year construction/ improvements 1968      
Year construction/improvements one 1999      
Date acquired Apr. 29, 2004      
Charlotte, North Carolina Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 6,757      
Land, initial cost 740      
Buildings & improvements, initial cost 8,423      
Improvement costs capitalized subsequent to acquisition 61      
Land, total cost 741      
Buildings & improvements, total cost 8,483      
Total 9,224      
Accumulated depreciation 2,981      
Net real estate $ 6,243      
Year construction/ improvements 1984      
Year construction/improvements one 1995      
Date acquired Jun. 30, 2004      
Canton, North Carolina Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 3,412      
Land, initial cost 150      
Buildings & improvements, initial cost 5,050      
Improvement costs capitalized subsequent to acquisition 7,285      
Land, total cost 150      
Buildings & improvements, total cost 12,335      
Total 12,485      
Accumulated depreciation 2,349      
Net real estate $ 10,136      
Year construction/ improvements 1998      
Year construction/improvements one 2014      
Date acquired Jul. 06, 2004      
Crenshaw, Pennsylvania Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 4,116      
Land, initial cost 100      
Buildings & improvements, initial cost 6,574      
Improvement costs capitalized subsequent to acquisition 269      
Land, total cost 100      
Buildings & improvements, total cost 6,843      
Total 6,943      
Accumulated depreciation 2,368      
Net real estate $ 4,575      
Year construction/ improvements 1991      
Date acquired Aug. 05, 2004      
Lexington, North Carolina Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,398      
Land, initial cost 820      
Buildings & improvements, initial cost 2,107      
Improvement costs capitalized subsequent to acquisition 69      
Land, total cost 820      
Buildings & improvements, total cost 2,176      
Total 2,996      
Accumulated depreciation 778      
Net real estate $ 2,218      
Year construction/ improvements 1986      
Date acquired Aug. 05, 2004      
Austin, Texas Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 1,000      
Buildings & improvements, initial cost 6,296      
Improvement costs capitalized subsequent to acquisition 703      
Land, total cost 1,000      
Buildings & improvements, total cost 6,999      
Total 7,999      
Accumulated depreciation 2,280      
Net real estate $ 5,719      
Year construction/ improvements 2001      
Date acquired Sep. 16, 2004      
Mt. Pocono, Pennsylvania Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 350      
Buildings & improvements, initial cost 5,819      
Improvement costs capitalized subsequent to acquisition 18      
Land, total cost 350      
Buildings & improvements, total cost 5,837      
Total 6,187      
Accumulated depreciation 2,007      
Net real estate $ 4,180      
Year construction/ improvements 1995      
Year construction/improvements one 1999      
Date acquired Oct. 15, 2004      
San Antonio, Texas Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 843      
Buildings & improvements, initial cost 7,514      
Improvement costs capitalized subsequent to acquisition 724      
Land, total cost 843      
Buildings & improvements, total cost 8,238      
Total 9,081      
Accumulated depreciation 3,065      
Net real estate $ 6,016      
Year construction/ improvements 1999      
Date acquired Feb. 10, 2005      
Big Flats, New York Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,240      
Land, initial cost 275      
Buildings & improvements, initial cost 6,459      
Improvement costs capitalized subsequent to acquisition 34      
Land, total cost 275      
Buildings & improvements, total cost 6,493      
Total 6,768      
Accumulated depreciation 2,123      
Net real estate $ 4,645      
Year construction/ improvements 2001      
Date acquired Apr. 15, 2005      
Wichita, Kansas Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 1,525      
Buildings & improvements, initial cost 9,703      
Improvement costs capitalized subsequent to acquisition 77      
Land, total cost 1,525      
Buildings & improvements, total cost 9,780      
Total 11,305      
Accumulated depreciation 3,255      
Net real estate $ 8,050      
Year construction/ improvements 2000      
Date acquired May 18, 2005      
Arlington, Texas Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 636      
Buildings & improvements, initial cost 3,695      
Improvement costs capitalized subsequent to acquisition 819      
Land, total cost 636      
Buildings & improvements, total cost 4,514      
Total 5,150      
Accumulated depreciation 1,349      
Net real estate $ 3,801      
Year construction/ improvements 1966      
Date acquired May 26, 2005      
Eatontown, New Jersey Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,814      
Land, initial cost 1,351      
Buildings & improvements, initial cost 3,520      
Improvement costs capitalized subsequent to acquisition 534      
Land, total cost 1,351      
Buildings & improvements, total cost 4,054      
Total 5,405      
Accumulated depreciation 1,356      
Net real estate $ 4,049      
Year construction/ improvements 1991      
Date acquired Jul. 07, 2005      
Duncan, South Carolina Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 9,252      
Land, initial cost 783      
Buildings & improvements, initial cost 10,790      
Improvement costs capitalized subsequent to acquisition 1,717      
Land, total cost 783      
Buildings & improvements, total cost 12,507      
Total 13,290      
Accumulated depreciation 3,935      
Net real estate $ 9,355      
Year construction/ improvements 1984      
Year construction/improvements one 2001      
Year construction/improvements two 2007      
Date acquired Jul. 14, 2005      
Duncan, South Carolina Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,300      
Land, initial cost 195      
Buildings & improvements, initial cost 2,682      
Improvement costs capitalized subsequent to acquisition 427      
Land, total cost 195      
Buildings & improvements, total cost 3,109      
Total 3,304      
Accumulated depreciation 978      
Net real estate $ 2,326      
Year construction/ improvements 1984      
Year construction/improvements one 2001      
Year construction/improvements two 2007      
Date acquired Jul. 14, 2005      
Clintonville, Wisconsin Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 55      
Buildings & improvements, initial cost 4,717      
Improvement costs capitalized subsequent to acquisition 3,250      
Land, total cost 55      
Buildings & improvements, total cost 7,967      
Total 8,022      
Accumulated depreciation 1,990      
Net real estate $ 6,032      
Year construction/ improvements 1992      
Year construction/improvements one 2013      
Date acquired Oct. 31, 2005      
Maple Heights, Ohio Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 4,000      
Land, initial cost 1,609      
Buildings & improvements, initial cost 10,065      
Improvement costs capitalized subsequent to acquisition 1,479      
Land, total cost 1,609      
Buildings & improvements, total cost 11,544      
Total 13,153      
Accumulated depreciation 4,412      
Net real estate $ 8,741      
Year construction/ improvements 1974      
Date acquired Dec. 21, 2005      
Richmond, Virginia Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 736      
Buildings & improvements, initial cost 5,336      
Improvement costs capitalized subsequent to acquisition 62      
Land, total cost 736      
Buildings & improvements, total cost 5,398      
Total 6,134      
Accumulated depreciation 1,698      
Net real estate $ 4,436      
Year construction/ improvements 1972      
Date acquired Dec. 30, 2005      
South Hadley, Massachusetts Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 471      
Buildings & improvements, initial cost 2,765      
Improvement costs capitalized subsequent to acquisition (949)      
Land, total cost 270      
Buildings & improvements, total cost 2,017      
Total 2,287      
Accumulated depreciation 844      
Net real estate $ 1,443      
Year construction/ improvements 1978      
Date acquired Feb. 15, 2006      
Champaign, Illinois Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 1,509      
Land, initial cost 687      
Buildings & improvements, initial cost 2,036      
Improvement costs capitalized subsequent to acquisition 2      
Land, total cost 687      
Buildings & improvements, total cost 2,038      
Total 2,725      
Accumulated depreciation 649      
Net real estate $ 2,076      
Year construction/ improvements 1996      
Date acquired Feb. 21, 2006      
Champaign, Illinois Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,959      
Land, initial cost 1,347      
Buildings & improvements, initial cost 3,992      
Improvement costs capitalized subsequent to acquisition 4      
Land, total cost 1,347      
Buildings & improvements, total cost 3,996      
Total 5,343      
Accumulated depreciation 1,272      
Net real estate $ 4,071      
Year construction/ improvements 1996      
Date acquired Feb. 21, 2006      
Champaign, Illinois Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 1,849      
Land, initial cost 842      
Buildings & improvements, initial cost 2,495      
Improvement costs capitalized subsequent to acquisition 2      
Land, total cost 842      
Buildings & improvements, total cost 2,497      
Total 3,339      
Accumulated depreciation 795      
Net real estate $ 2,544      
Year construction/ improvements 1996      
Date acquired Feb. 21, 2006      
Champaign, Illinois Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 1,691      
Land, initial cost 770      
Buildings & improvements, initial cost 2,281      
Improvement costs capitalized subsequent to acquisition 2      
Land, total cost 770      
Buildings & improvements, total cost 2,283      
Total 3,053      
Accumulated depreciation 727      
Net real estate $ 2,326      
Year construction/ improvements 1996      
Date acquired Feb. 21, 2006      
Burnsville, Minnesota Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 8,628      
Land, initial cost 3,511      
Buildings & improvements, initial cost 8,746      
Improvement costs capitalized subsequent to acquisition 6,693      
Land, total cost 3,511      
Buildings & improvements, total cost 15,439      
Total 18,950      
Accumulated depreciation 4,277      
Net real estate $ 14,673      
Year construction/ improvements 1984      
Date acquired May 10, 2006      
Menomonee Falls, Wisconsin Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 625      
Buildings & improvements, initial cost 6,911      
Improvement costs capitalized subsequent to acquisition 686      
Land, total cost 625      
Buildings & improvements, total cost 7,597      
Total 8,222      
Accumulated depreciation 2,167      
Net real estate $ 6,055      
Year construction/ improvements 1986      
Year construction/improvements one 2000      
Date acquired Jun. 30, 2006      
Baytown, Texas Medical Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 221      
Buildings & improvements, initial cost 2,443      
Improvement costs capitalized subsequent to acquisition 2,451      
Land, total cost 221      
Buildings & improvements, total cost 4,894      
Total 5,115      
Accumulated depreciation 969      
Net real estate $ 4,146      
Year construction/ improvements 1997      
Date acquired Jul. 11, 2006      
Mason, Ohio Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 3,930      
Land, initial cost 797      
Buildings & improvements, initial cost 6,258      
Improvement costs capitalized subsequent to acquisition 540      
Land, total cost 797      
Buildings & improvements, total cost 6,798      
Total 7,595      
Accumulated depreciation 2,176      
Net real estate $ 5,419      
Year construction/ improvements 2002      
Date acquired Jan. 05, 2007      
Raleigh, North Carolina Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 1,606      
Buildings & improvements, initial cost 5,513      
Improvement costs capitalized subsequent to acquisition 3,749      
Land, total cost 1,606      
Buildings & improvements, total cost 9,262      
Total 10,868      
Accumulated depreciation 2,138      
Net real estate $ 8,730      
Year construction/ improvements 1994      
Date acquired Feb. 16, 2007      
Tulsa, Oklahoma Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 6,917      
Land, initial cost 0      
Buildings & improvements, initial cost 14,057      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 0      
Buildings & improvements, total cost 14,057      
Total 14,057      
Accumulated depreciation 4,582      
Net real estate $ 9,475      
Year construction/ improvements 2004      
Date acquired Mar. 01, 2007      
Hialeah, Florida Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 3,562      
Buildings & improvements, initial cost 6,672      
Improvement costs capitalized subsequent to acquisition 769      
Land, total cost 3,562      
Buildings & improvements, total cost 7,441      
Total 11,003      
Accumulated depreciation 2,055      
Net real estate $ 8,948      
Year construction/ improvements 1956      
Year construction/improvements one 1992      
Date acquired Mar. 09, 2007      
Tewksbury, Massachusetts Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 1,395      
Buildings & improvements, initial cost 8,893      
Improvement costs capitalized subsequent to acquisition (2,441)      
Land, total cost 904      
Buildings & improvements, total cost 6,943      
Total 7,847      
Accumulated depreciation 2,622      
Net real estate $ 5,225      
Year construction/ improvements 1985      
Year construction/improvements one 1989      
Date acquired May 17, 2007      
Mason, Ohio Retail Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 1,201      
Buildings & improvements, initial cost 4,961      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 1,201      
Buildings & improvements, total cost 4,961      
Total 6,162      
Accumulated depreciation 1,359      
Net real estate $ 4,803      
Year construction/ improvements 2007      
Date acquired Jul. 01, 2007      
Cicero, New York Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 3,459      
Land, initial cost 299      
Buildings & improvements, initial cost 5,019      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 299      
Buildings & improvements, total cost 5,019      
Total 5,318      
Accumulated depreciation 1,328      
Net real estate $ 3,990      
Year construction/ improvements 2005      
Date acquired Sep. 06, 2007      
Grand Rapids, Michigan Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 5,393      
Land, initial cost 1,629      
Buildings & improvements, initial cost 10,500      
Improvement costs capitalized subsequent to acquisition 308      
Land, total cost 1,629      
Buildings & improvements, total cost 10,808      
Total 12,437      
Accumulated depreciation 2,913      
Net real estate $ 9,524      
Year construction/ improvements 2001      
Date acquired Sep. 28, 2007      
Bollingbrook, Illinois Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 1,272      
Buildings & improvements, initial cost 5,003      
Improvement costs capitalized subsequent to acquisition 856      
Land, total cost 1,272      
Buildings & improvements, total cost 5,859      
Total 7,131      
Accumulated depreciation 1,579      
Net real estate $ 5,552      
Year construction/ improvements 2002      
Date acquired Sep. 28, 2007      
Decatur, Georgia Medical Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 783      
Buildings & improvements, initial cost 3,241      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 783      
Buildings & improvements, total cost 3,241      
Total 4,024      
Accumulated depreciation 878      
Net real estate $ 3,146      
Year construction/ improvements 1989      
Date acquired Dec. 13, 2007      
Decatur, Georgia Medical Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 205      
Buildings & improvements, initial cost 847      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 205      
Buildings & improvements, total cost 847      
Total 1,052      
Accumulated depreciation 230      
Net real estate $ 822      
Year construction/ improvements 1989      
Date acquired Dec. 13, 2007      
Decatur, Georgia Medical Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 257      
Buildings & improvements, initial cost 1,062      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 257      
Buildings & improvements, total cost 1,062      
Total 1,319      
Accumulated depreciation 288      
Net real estate $ 1,031      
Year construction/ improvements 1989      
Date acquired Dec. 13, 2007      
Lawrenceville, Georgia Medical Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 678      
Buildings & improvements, initial cost 2,807      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 678      
Buildings & improvements, total cost 2,807      
Total 3,485      
Accumulated depreciation 761      
Net real estate $ 2,724      
Year construction/ improvements 2005      
Date acquired Dec. 13, 2007      
Snellville, Georgia Medical Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 176      
Buildings & improvements, initial cost 727      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 176      
Buildings & improvements, total cost 727      
Total 903      
Accumulated depreciation 197      
Net real estate $ 706      
Year construction/ improvements 1986      
Date acquired Dec. 13, 2007      
Covington, Georgia Medical Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 232      
Buildings & improvements, initial cost 959      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 232      
Buildings & improvements, total cost 959      
Total 1,191      
Accumulated depreciation 260      
Net real estate $ 931      
Year construction/ improvements 2000      
Date acquired Dec. 13, 2007      
Conyers Georgia Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 296      
Buildings & improvements, initial cost 1,228      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 296      
Buildings & improvements, total cost 1,228      
Total 1,524      
Accumulated depreciation 333      
Net real estate $ 1,191      
Year construction/ improvements 2004      
Date acquired Dec. 13, 2007      
Cumming, Georgia Medical Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,908      
Land, initial cost 738      
Buildings & improvements, initial cost 3,055      
Improvement costs capitalized subsequent to acquisition 2,524      
Land, total cost 741      
Buildings & improvements, total cost 5,576      
Total 6,317      
Accumulated depreciation 1,180      
Net real estate $ 5,137      
Year construction/ improvements 1994      
Date acquired Dec. 13, 2007      
Reading, Pennsylvania Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 3,684      
Land, initial cost 491      
Buildings & improvements, initial cost 6,202      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 491      
Buildings & improvements, total cost 6,202      
Total 6,693      
Accumulated depreciation 1,583      
Net real estate $ 5,110      
Year construction/ improvements 2007      
Date acquired Jan. 29, 2008      
Fridley, Minnesota Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 4,785      
Land, initial cost 1,354      
Buildings & improvements, initial cost 8,074      
Improvement costs capitalized subsequent to acquisition 399      
Land, total cost 1,383      
Buildings & improvements, total cost 8,444      
Total 9,827      
Accumulated depreciation 2,588      
Net real estate $ 7,239      
Year construction/ improvements 1985      
Year construction/improvements one 2006      
Date acquired Feb. 26, 2008      
Pineville, North Carolina Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,141      
Land, initial cost 669      
Buildings & improvements, initial cost 3,028      
Improvement costs capitalized subsequent to acquisition 6      
Land, total cost 669      
Buildings & improvements, total cost 3,034      
Total 3,703      
Accumulated depreciation 777      
Net real estate $ 2,926      
Year construction/ improvements 1985      
Date acquired Apr. 30, 2008      
Marietta, Ohio Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 5,226      
Land, initial cost 829      
Buildings & improvements, initial cost 6,607      
Improvement costs capitalized subsequent to acquisition 529      
Land, total cost 829      
Buildings & improvements, total cost 7,136      
Total 7,965      
Accumulated depreciation 1,647      
Net real estate $ 6,318      
Year construction/ improvements 1992      
Year construction/improvements one 2007      
Date acquired Aug. 29, 2008      
Chalfont, Pennsylvania Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 4,672      
Land, initial cost 1,249      
Buildings & improvements, initial cost 6,420      
Improvement costs capitalized subsequent to acquisition 327      
Land, total cost 1,249      
Buildings & improvements, total cost 6,747      
Total 7,996      
Accumulated depreciation 1,830      
Net real estate $ 6,166      
Year construction/ improvements 1987      
Date acquired Aug. 29, 2008      
Orange City, Iowa Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 7,365      
Land, initial cost 258      
Buildings & improvements, initial cost 5,861      
Improvement costs capitalized subsequent to acquisition 6      
Land, total cost 258      
Buildings & improvements, total cost 5,867      
Total 6,125      
Accumulated depreciation 1,293      
Net real estate $ 4,832      
Year construction/ improvements 1990      
Date acquired Dec. 15, 2010      
Hickory, North Carolina Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 6,257      
Land, initial cost 1,163      
Buildings & improvements, initial cost 6,605      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 1,163      
Buildings & improvements, total cost 6,605      
Total 7,768      
Accumulated depreciation 2,026      
Net real estate $ 5,742      
Year construction/ improvements 2008      
Date acquired Apr. 04, 2011      
Springfield, Missouri Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 1,700      
Buildings & improvements, initial cost 12,038      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 1,700      
Buildings & improvements, total cost 12,038      
Total 13,738      
Accumulated depreciation 2,367      
Net real estate $ 11,371      
Year construction/ improvements 2006      
Date acquired Jun. 20, 2011      
Boston Heights, Ohio Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,472      
Land, initial cost 449      
Buildings & improvements, initial cost 3,010      
Improvement costs capitalized subsequent to acquisition 11      
Land, total cost 449      
Buildings & improvements, total cost 3,021      
Total 3,470      
Accumulated depreciation 830      
Net real estate $ 2,640      
Year construction/ improvements 2011      
Date acquired Oct. 20, 2011      
Parsippany, New Jersey Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 6,331      
Land, initial cost 1,696      
Buildings & improvements, initial cost 7,077      
Improvement costs capitalized subsequent to acquisition 81      
Land, total cost 1,696      
Buildings & improvements, total cost 7,158      
Total 8,854      
Accumulated depreciation 1,675      
Net real estate $ 7,179      
Year construction/ improvements 1984      
Date acquired Oct. 28, 2011      
Dartmouth, Massachusetts Retail Location        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 3,703      
Land, initial cost 0      
Buildings & improvements, initial cost 4,236      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 0      
Buildings & improvements, total cost 4,236      
Total 4,236      
Accumulated depreciation 723      
Net real estate $ 3,513      
Year construction/ improvements 2011      
Date acquired Nov. 18, 2011      
Springfield, Missouri Retail Location        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 1,550      
Land, initial cost 0      
Buildings & improvements, initial cost 2,275      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 0      
Buildings & improvements, total cost 2,275      
Total 2,275      
Accumulated depreciation 497      
Net real estate $ 1,778      
Year construction/ improvements 2005      
Date acquired Dec. 13, 2011      
Pittsburgh, Pennsylvania Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,539      
Land, initial cost 281      
Buildings & improvements, initial cost 3,205      
Improvement costs capitalized subsequent to acquisition 743      
Land, total cost 281      
Buildings & improvements, total cost 3,948      
Total 4,229      
Accumulated depreciation 757      
Net real estate $ 3,472      
Year construction/ improvements 1968      
Date acquired Dec. 28, 2011      
Ashburn, Virginia Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 6,680      
Land, initial cost 706      
Buildings & improvements, initial cost 7,858      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 705      
Buildings & improvements, total cost 7,859      
Total 8,564      
Accumulated depreciation 1,549      
Net real estate $ 7,015      
Year construction/ improvements 2002      
Date acquired Jan. 25, 2012      
Ottumwa, Iowa Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 3,650      
Land, initial cost 212      
Buildings & improvements, initial cost 5,072      
Improvement costs capitalized subsequent to acquisition 287      
Land, total cost 212      
Buildings & improvements, total cost 5,359      
Total 5,571      
Accumulated depreciation 1,055      
Net real estate $ 4,516      
Year construction/ improvements 1970      
Date acquired May 30, 2012      
New Albany, Ohio Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 8,078      
Land, initial cost 1,658      
Buildings & improvements, initial cost 8,746      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 1,658      
Buildings & improvements, total cost 8,746      
Total 10,404      
Accumulated depreciation 1,796      
Net real estate $ 8,608      
Year construction/ improvements 2007      
Date acquired Jun. 05, 2012      
Columbus, Georgia Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 4,181      
Land, initial cost 1,378      
Buildings & improvements, initial cost 4,520      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 1,378      
Buildings & improvements, total cost 4,520      
Total 5,898      
Accumulated depreciation 1,031      
Net real estate $ 4,867      
Year construction/ improvements 2012      
Date acquired Jun. 21, 2012      
Columbus, Ohio Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,624      
Land, initial cost 542      
Buildings & improvements, initial cost 2,453      
Improvement costs capitalized subsequent to acquisition 92      
Land, total cost 542      
Buildings & improvements, total cost 2,545      
Total 3,087      
Accumulated depreciation 639      
Net real estate $ 2,448      
Year construction/ improvements 1981      
Date acquired Jun. 28, 2012      
Jupiter, Florida Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 9,493      
Land, initial cost 1,160      
Buildings & improvements, initial cost 11,994      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 1,160      
Buildings & improvements, total cost 11,994      
Total 13,154      
Accumulated depreciation 1,926      
Net real estate $ 11,228      
Year construction/ improvements 2011      
Date acquired Sep. 26, 2012      
Fort Worth, Texas Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 12,353      
Land, initial cost 963      
Buildings & improvements, initial cost 15,647      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 963      
Buildings & improvements, total cost 15,647      
Total 16,610      
Accumulated depreciation 2,452      
Net real estate $ 14,158      
Year construction/ improvements 2005      
Date acquired Nov. 08, 2012      
Columbia, South Carolina Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 16,576      
Land, initial cost 1,905      
Buildings & improvements, initial cost 20,648      
Improvement costs capitalized subsequent to acquisition 8      
Land, total cost 1,905      
Buildings & improvements, total cost 20,656      
Total 22,561      
Accumulated depreciation 4,521      
Net real estate $ 18,040      
Year construction/ improvements 2010      
Date acquired Nov. 21, 2012      
Egg Harbor, New Jersey Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 3,269      
Land, initial cost 1,627      
Buildings & improvements, initial cost 3,017      
Improvement costs capitalized subsequent to acquisition 315      
Land, total cost 1,627      
Buildings & improvements, total cost 3,332      
Total 4,959      
Accumulated depreciation 579      
Net real estate $ 4,380      
Year construction/ improvements 1985      
Date acquired Mar. 28, 2013      
Vance, Alabama Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 457      
Buildings & improvements, initial cost 10,529      
Improvement costs capitalized subsequent to acquisition 6,691      
Land, total cost 456      
Buildings & improvements, total cost 17,221      
Total 17,677      
Accumulated depreciation 1,822      
Net real estate $ 15,855      
Year construction/ improvements 2013      
Date acquired May 09, 2013      
Blaine, Minnesota Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 7,646      
Land, initial cost 1,060      
Buildings & improvements, initial cost 10,518      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 1,060      
Buildings & improvements, total cost 10,518      
Total 11,578      
Accumulated depreciation 2,117      
Net real estate $ 9,461      
Year construction/ improvements 2009      
Date acquired May 10, 2013      
Austin, Texas Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 32,834      
Land, initial cost 2,330      
Buildings & improvements, initial cost 44,021      
Improvement costs capitalized subsequent to acquisition 122      
Land, total cost 2,330      
Buildings & improvements, total cost 44,143      
Total 46,473      
Accumulated depreciation 10,162      
Net real estate $ 36,311      
Year construction/ improvements 1999      
Date acquired Jul. 09, 2013      
Allen, Texas Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 8,221      
Land, initial cost 2,699      
Buildings & improvements, initial cost 7,945      
Improvement costs capitalized subsequent to acquisition 771      
Land, total cost 2,699      
Buildings & improvements, total cost 8,716      
Total 11,415      
Accumulated depreciation 1,827      
Net real estate $ 9,588      
Year construction/ improvements 1998      
Date acquired Jul. 10, 2013      
Englewood, Colorado Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 10,577      
Land, initial cost 1,503      
Buildings & improvements, initial cost 11,739      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 1,503      
Buildings & improvements, total cost 11,739      
Total 13,242      
Accumulated depreciation 2,098      
Net real estate $ 11,144      
Year construction/ improvements 2008      
Date acquired Dec. 11, 2013      
Novi, Michigan Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 4,018      
Land, initial cost 352      
Buildings & improvements, initial cost 5,626      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 352      
Buildings & improvements, total cost 5,626      
Total 5,978      
Accumulated depreciation 780      
Net real estate $ 5,198      
Year construction/ improvements 1988      
Date acquired Dec. 27, 2013      
Allen, Texas Retail Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 3,040      
Land, initial cost 874      
Buildings & improvements, initial cost 3,634      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 874      
Buildings & improvements, total cost 3,634      
Total 4,508      
Accumulated depreciation 472      
Net real estate $ 4,036      
Year construction/ improvements 2004      
Date acquired Mar. 27, 2014      
Colleyville, Texas Retail Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,812      
Land, initial cost 1,277      
Buildings & improvements, initial cost 2,424      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 1,277      
Buildings & improvements, total cost 2,424      
Total 3,701      
Accumulated depreciation 359      
Net real estate $ 3,342      
Year construction/ improvements 2000      
Date acquired Mar. 27, 2014      
Rancho Cordova, California Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 4,740      
Land, initial cost 752      
Buildings & improvements, initial cost 6,176      
Improvement costs capitalized subsequent to acquisition 287      
Land, total cost 752      
Buildings & improvements, total cost 6,463      
Total 7,215      
Accumulated depreciation 806      
Net real estate $ 6,409      
Year construction/ improvements 1986      
Date acquired Apr. 22, 2014      
Coppell, Texas Retail Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 3,230      
Land, initial cost 1,448      
Buildings & improvements, initial cost 3,349      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 1,448      
Buildings & improvements, total cost 3,349      
Total 4,797      
Accumulated depreciation 420      
Net real estate $ 4,377      
Year construction/ improvements 2005      
Date acquired May 08, 2014      
Columbus, Ohio (3) Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 990      
Buildings & improvements, initial cost 8,017      
Improvement costs capitalized subsequent to acquisition 1,600      
Land, total cost 990      
Buildings & improvements, total cost 9,617      
Total 10,607      
Accumulated depreciation 1,628      
Net real estate $ 8,979      
Year construction/ improvements 1986      
Date acquired May 13, 2014      
Taylor, Pennsylvania Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 22,045      
Land, initial cost 3,101      
Buildings & improvements, initial cost 25,405      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 3,101      
Buildings & improvements, total cost 25,405      
Total 28,506      
Accumulated depreciation 2,867      
Net real estate $ 25,639      
Year construction/ improvements 2000      
Year construction/improvements one 2006      
Date acquired Jun. 09, 2014      
Aurora, Colorado Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 2,882      
Buildings & improvements, initial cost 3,917      
Improvement costs capitalized subsequent to acquisition 96      
Land, total cost 2,882      
Buildings & improvements, total cost 4,013      
Total 6,895      
Accumulated depreciation 571      
Net real estate $ 6,324      
Year construction/ improvements 1983      
Date acquired Jul. 01, 2014      
Indianapolis, Indiana Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 5,846      
Land, initial cost 502      
Buildings & improvements, initial cost 6,422      
Improvement costs capitalized subsequent to acquisition 645      
Land, total cost 498      
Buildings & improvements, total cost 7,071      
Total 7,569      
Accumulated depreciation 1,057      
Net real estate $ 6,512      
Year construction/ improvements 1981      
Year construction/improvements one 2014      
Date acquired Sep. 03, 2014      
Denver, Colorado Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 1,621      
Buildings & improvements, initial cost 7,071      
Improvement costs capitalized subsequent to acquisition 243      
Land, total cost 1,621      
Buildings & improvements, total cost 7,314      
Total 8,935      
Accumulated depreciation 877      
Net real estate $ 8,058      
Year construction/ improvements 1985      
Date acquired Oct. 31, 2014      
Monroe, Michigan Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 10,280      
Land, initial cost 658      
Buildings & improvements, initial cost 14,607      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 657      
Buildings & improvements, total cost 14,608      
Total 15,265      
Accumulated depreciation 1,378      
Net real estate $ 13,887      
Year construction/ improvements 2004      
Date acquired Dec. 23, 2014      
Monroe, Michigan Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 7,196      
Land, initial cost 460      
Buildings & improvements, initial cost 10,225      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 460      
Buildings & improvements, total cost 10,225      
Total 10,685      
Accumulated depreciation 965      
Net real estate $ 9,720      
Year construction/ improvements 2004      
Date acquired Dec. 23, 2014      
Richardson, Texas Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 13,873      
Land, initial cost 2,728      
Buildings & improvements, initial cost 15,372      
Improvement costs capitalized subsequent to acquisition 66      
Land, total cost 2,728      
Buildings & improvements, total cost 15,438      
Total 18,166      
Accumulated depreciation 1,949      
Net real estate $ 16,217      
Year construction/ improvements 1985      
Year construction/improvements one 2008      
Date acquired Mar. 06, 2015      
Birmingham, Alabama Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 650      
Buildings & improvements, initial cost 2,034      
Improvement costs capitalized subsequent to acquisition 50      
Land, total cost 650      
Buildings & improvements, total cost 2,084      
Total 2,734      
Accumulated depreciation 274      
Net real estate $ 2,460      
Year construction/ improvements 1982      
Year construction/improvements one 2010      
Date acquired Mar. 20, 2015      
Dublin, Ohio Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 4,192      
Land, initial cost 1,338      
Buildings & improvements, initial cost 5,058      
Improvement costs capitalized subsequent to acquisition 35      
Land, total cost 1,338      
Buildings & improvements, total cost 5,093      
Total 6,431      
Accumulated depreciation 631      
Net real estate $ 5,800      
Year construction/ improvements 1980      
Date acquired May 28, 2015      
Draper, Utah Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 12,666      
Land, initial cost 3,248      
Buildings & improvements, initial cost 13,129      
Improvement costs capitalized subsequent to acquisition 74      
Land, total cost 3,248      
Buildings & improvements, total cost 13,203      
Total 16,451      
Accumulated depreciation 1,382      
Net real estate $ 15,069      
Year construction/ improvements 2008      
Date acquired May 29, 2015      
Hapeville, Georgia Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 7,252      
Land, initial cost 2,272      
Buildings & improvements, initial cost 8,778      
Improvement costs capitalized subsequent to acquisition 263      
Land, total cost 2,272      
Buildings & improvements, total cost 9,041      
Total 11,313      
Accumulated depreciation 834      
Net real estate $ 10,479      
Year construction/ improvements 1999      
Year construction/improvements one 2007      
Date acquired Jul. 15, 2015      
Villa Rica, Georgia Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 3,677      
Land, initial cost 293      
Buildings & improvements, initial cost 5,277      
Improvement costs capitalized subsequent to acquisition 18      
Land, total cost 293      
Buildings & improvements, total cost 5,295      
Total 5,588      
Accumulated depreciation 435      
Net real estate $ 5,153      
Year construction/ improvements 2000      
Year construction/improvements one 2014      
Date acquired Oct. 20, 2015      
Taylorsville, Utah Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 9,569      
Land, initial cost 3,008      
Buildings & improvements, initial cost 10,659      
Improvement costs capitalized subsequent to acquisition 370      
Land, total cost 3,008      
Buildings & improvements, total cost 11,029      
Total 14,037      
Accumulated depreciation 920      
Net real estate $ 13,117      
Year construction/ improvements 1997      
Date acquired May 26, 2016      
Fort Lauderdale, Florida Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 13,721      
Land, initial cost 4,117      
Buildings & improvements, initial cost 15,516      
Improvement costs capitalized subsequent to acquisition 1,881      
Land, total cost 4,117      
Buildings & improvements, total cost 17,397      
Total 21,514      
Accumulated depreciation 950      
Net real estate $ 20,564      
Year construction/ improvements 1984      
Date acquired Sep. 12, 2016      
King of Prussia, Pennsylvania Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 14,800      
Land, initial cost 3,681      
Buildings & improvements, initial cost 15,739      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 3,681      
Buildings & improvements, total cost 15,739      
Total 19,420      
Accumulated depreciation 750      
Net real estate $ 18,670      
Year construction/ improvements 2001      
Date acquired Dec. 14, 2016      
Conshohocken Pennsylvania Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 11,036      
Land, initial cost 1,996      
Buildings & improvements, initial cost 10,880      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 1,996      
Buildings & improvements, total cost 10,880      
Total 12,876      
Accumulated depreciation 228      
Net real estate $ 12,648      
Year construction/ improvements 1996      
Date acquired Jun. 22, 2017      
Philadelphia Pennsylvania, Industrial Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 14,924      
Land, initial cost 5,896      
Buildings & improvements, initial cost 16,282      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 5,896      
Buildings & improvements, total cost 16,282      
Total 22,178      
Accumulated depreciation 371      
Net real estate $ 21,807      
Year construction/ improvements 1994      
Year construction/improvements one 2011      
Date acquired Jul. 07, 2017      
Maitland Florida Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 11,907      
Land, initial cost 3,073      
Buildings & improvements, initial cost 19,661      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 3,073      
Buildings & improvements, total cost 19,661      
Total 22,734      
Accumulated depreciation 450      
Net real estate $ 22,284      
Year construction/ improvements 1998      
Date acquired Jul. 31, 2017      
Maitland Florida Office Building Two        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 8,327      
Land, initial cost 2,077      
Buildings & improvements, initial cost 1,084      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 2,077      
Buildings & improvements, total cost 1,084      
Total 3,161      
Accumulated depreciation 69      
Net real estate $ 3,092      
Year construction/ improvements 1998      
Date acquired Jul. 31, 2017      
Maitland Florida Office Building Three        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 8,327      
Land, initial cost 2,095      
Buildings & improvements, initial cost 9,339      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 2,095      
Buildings & improvements, total cost 9,339      
Total 11,434      
Accumulated depreciation 163      
Net real estate $ 11,271      
Year construction/ improvements 1999      
Date acquired Jul. 31, 2017      
Columbus Ohio Office Building Two        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 1,926      
Buildings & improvements, initial cost 11,410      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 1,926      
Buildings & improvements, total cost 11,410      
Total 13,336      
Accumulated depreciation 48      
Net real estate $ 13,288      
Year construction/ improvements 2007      
Date acquired Dec. 01, 2017      
Salt Lake City Office Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 4,446      
Buildings & improvements, initial cost 9,938      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 4,446      
Buildings & improvements, total cost 9,938      
Total 14,384      
Accumulated depreciation 40      
Net real estate $ 14,344      
Year construction/ improvements 2007      
Date acquired Dec. 01, 2017