Annual report pursuant to Section 13 and 15(d)

Schedule III - Real Estate and Accumulated Depreciation (Detail)

v3.6.0.2
Schedule III - Real Estate and Accumulated Depreciation (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 450,184      
Land, Initial Cost 107,301      
Buildings & Improvements, Initial Cost 679,515      
Improvement Costs Capitalized Subsequent to Acquisition 46,387      
Land, Total cost 106,943      
Buildings & Improvements, Total cost 726,260      
Total 833,203 $ 782,276 $ 722,565 $ 642,353
Accumulated Depreciation 134,329 $ 113,089 $ 92,133 $ 81,241
Net Real Estate 698,874      
Raleigh, North Carolina Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost 4,664      
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 1,983      
Net Real Estate $ 3,493      
Year Construction/ Improvements 1997      
Date Acquired Dec. 23, 2003      
Canton, Ohio Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 1,626      
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 1,207      
Net Real Estate $ 2,562      
Year Construction/ Improvements 1994      
Date Acquired Jan. 30, 2004      
Akron, Ohio Office Building [Member]        
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 1,283      
Land, Total cost 1,974      
Buildings & Improvements, Total cost 8,053      
Total 10,027      
Accumulated Depreciation 2,342      
Net Real Estate $ 7,685      
Year Construction/ Improvements 1968      
Year Construction/Improvements One 1999      
Date Acquired Apr. 29, 2004      
Charlotte, North Carolina Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 6,982      
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 2,761      
Net Real Estate $ 6,463      
Year Construction/ Improvements 1984      
Year Construction/Improvements One 1995      
Date Acquired Jun. 30, 2004      
Canton, North Carolina Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 3,497      
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 2,033      
Net Real Estate $ 10,452      
Year Construction/ Improvements 1998      
Year Construction/Improvements One 2014      
Date Acquired Jul. 06, 2004      
Crenshaw, Pennsylvania Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 0      
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 2,183      
Net Real Estate $ 4,760      
Year Construction/ Improvements 1991      
Date Acquired Aug. 05, 2004      
Lexington, North Carolina Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 0      
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 715      
Net Real Estate $ 2,281      
Year Construction/ Improvements 1986      
Date Acquired Aug. 05, 2004      
Austin, Texas Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 6,500      
Land, Initial Cost 1,000      
Buildings & Improvements, Initial Cost 6,296      
Improvement Costs Capitalized Subsequent to Acquisition 876      
Land, Total cost 1,000      
Buildings & Improvements, Total cost 7,172      
Total 8,172      
Accumulated Depreciation 2,096      
Net Real Estate $ 6,076      
Year Construction/ Improvements 2001      
Date Acquired Sep. 16, 2004      
Mt. Pocono, Pennsylvania Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 4,713      
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 1,855      
Net Real Estate $ 4,332      
Year Construction/ Improvements 1995      
Year Construction/Improvements One 1999      
Date Acquired Oct. 15, 2004      
San Antonio, Texas Office Building [Member]        
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 621      
Land, Total cost 843      
Buildings & Improvements, Total cost 8,135      
Total 8,978      
Accumulated Depreciation 2,838      
Net Real Estate $ 6,140      
Year Construction/ Improvements 1999      
Date Acquired Feb. 10, 2005      
Big Flats, New York Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 2,677      
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 1,956      
Net Real Estate $ 4,812      
Year Construction/ Improvements 2001      
Date Acquired Apr. 15, 2005      
Wichita, Kansas Office Building [Member]        
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 327      
Land, Total cost 1,525      
Buildings & Improvements, Total cost 10,030      
Total 11,555      
Accumulated Depreciation 3,007      
Net Real Estate $ 8,548      
Year Construction/ Improvements 2000      
Date Acquired May 18, 2005      
Arlington, Texas Industrial Building [Member]        
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 1,249      
Net Real Estate $ 3,901      
Year Construction/ Improvements 1966      
Date Acquired May 26, 2005      
Eatontown, New Jersey Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 3,357      
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 1,241      
Net Real Estate $ 4,164      
Year Construction/ Improvements 1991      
Date Acquired Jul. 07, 2005      
Franklin Township, New Jersey Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 6,544      
Land, Initial Cost 1,632      
Buildings & Improvements, Initial Cost 6,200      
Improvement Costs Capitalized Subsequent to Acquisition 516      
Land, Total cost 1,632      
Buildings & Improvements, Total cost 6,716      
Total 8,348      
Accumulated Depreciation 1,809      
Net Real Estate $ 6,539      
Year Construction/ Improvements 1978      
Date Acquired Jul. 11, 2005      
Duncan, South Carolina Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 9,560      
Land, Initial Cost 783      
Buildings & Improvements, Initial Cost 10,790      
Improvement Costs Capitalized Subsequent to Acquisition 1,889      
Land, Total cost 783      
Buildings & Improvements, Total cost 12,679      
Total 13,462      
Accumulated Depreciation 3,615      
Net Real Estate $ 9,847      
Year Construction/ Improvements 1984      
Year Construction/Improvements One 2001      
Year Construction/Improvements Two 2007      
Date Acquired Jul. 14, 2005      
Duncan, South Carolina Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 2,376      
Land, Initial Cost 195      
Buildings & Improvements, Initial Cost 2,682      
Improvement Costs Capitalized Subsequent to Acquisition 470      
Land, Total cost 195      
Buildings & Improvements, Total cost 3,152      
Total 3,347      
Accumulated Depreciation 899      
Net Real Estate $ 2,448      
Year Construction/ Improvements 1984      
Year Construction/Improvements One 2001      
Year Construction/Improvements Two 2007      
Date Acquired Jul. 14, 2005      
Hazelwood, Missouri Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 2,228      
Land, Initial Cost 763      
Buildings & Improvements, Initial Cost 2,309      
Improvement Costs Capitalized Subsequent to Acquisition 34      
Land, Total cost 592      
Buildings & Improvements, Total cost 2,514      
Total 3,106      
Accumulated Depreciation 859      
Net Real Estate $ 2,247      
Year Construction/ Improvements 1977      
Date Acquired Aug. 05, 2005      
Newburyport Massachusetts Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 0      
Land, Initial Cost 629      
Buildings & Improvements, Initial Cost 6,504      
Improvement Costs Capitalized Subsequent to Acquisition 2,179      
Land, Total cost 629      
Buildings & Improvements, Total cost 8,683      
Total 9,312      
Accumulated Depreciation 2,315      
Net Real Estate $ 6,997      
Year Construction/ Improvements 1994      
Date Acquired Oct. 17, 2005      
Clintonville, Wisconsin Industrial Building [Member]        
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 1,765      
Net Real Estate $ 6,257      
Year Construction/ Improvements 1992      
Year Construction/Improvements One 2013      
Date Acquired Oct. 31, 2005      
Maple Heights, Ohio Industrial Building [Member]        
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 1,288      
Land, Total cost 1,609      
Buildings & Improvements, Total cost 11,353      
Total 12,962      
Accumulated Depreciation 4,019      
Net Real Estate $ 8,943      
Year Construction/ Improvements 1974      
Date Acquired Dec. 21, 2005      
Richmond, Virginia Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 5,275      
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 1,560      
Net Real Estate $ 4,574      
Year Construction/ Improvements 1972      
Date Acquired Dec. 30, 2005      
South Hadley, Massachusetts Industrial Building [Member]        
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 (984)      
Land, Total cost 270      
Buildings & Improvements, Total cost 1,982      
Total 2,252      
Accumulated Depreciation 790      
Net Real Estate $ 1,462      
Year Construction/ Improvements 1978      
Date Acquired Feb. 15, 2006      
Champaign, Illinois Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 1,542      
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 598      
Net Real Estate $ 2,127      
Year Construction/ Improvements 1996      
Date Acquired Feb. 21, 2006      
Champaign, Illinois Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 3,024      
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 1,172      
Net Real Estate $ 4,171      
Year Construction/ Improvements 1996      
Date Acquired Feb. 21, 2006      
Champaign, Illinois Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 1,890      
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 732      
Net Real Estate $ 2,607      
Year Construction/ Improvements 1996      
Date Acquired Feb. 21, 2006      
Champaign, Illinois Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 1,728      
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 669      
Net Real Estate $ 2,384      
Year Construction/ Improvements 1996      
Date Acquired Feb. 21, 2006      
Burnsville, Minnesota Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 7,900      
Land, Initial Cost 3,511      
Buildings & Improvements, Initial Cost 8,746      
Improvement Costs Capitalized Subsequent to Acquisition 6,409      
Land, Total cost 3,511      
Buildings & Improvements, Total cost 15,155      
Total 18,666      
Accumulated Depreciation 3,495      
Net Real Estate $ 15,171      
Year Construction/ Improvements 1984      
Date Acquired May 10, 2006      
Menomonee Falls, Wisconsin Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 6,552      
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 1,923      
Net Real Estate $ 6,299      
Year Construction/ Improvements 1986      
Year Construction/Improvements One 2000      
Date Acquired Jun. 30, 2006      
Baytown, Texas Medical Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 2,000      
Land, Initial Cost 221      
Buildings & Improvements, Initial Cost 2,443      
Improvement Costs Capitalized Subsequent to Acquisition 1,916      
Land, Total cost 221      
Buildings & Improvements, Total cost 4,359      
Total 4,580      
Accumulated Depreciation 791      
Net Real Estate $ 3,789      
Year Construction/ Improvements 1997      
Date Acquired Jul. 11, 2006      
Mason, Ohio Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 4,042      
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 1,971      
Net Real Estate $ 5,624      
Year Construction/ Improvements 2002      
Date Acquired Jan. 05, 2007      
Raleigh, North Carolina Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 4,978      
Land, Initial Cost 1,606      
Buildings & Improvements, Initial Cost 5,513      
Improvement Costs Capitalized Subsequent to Acquisition 3,725      
Land, Total cost 1,606      
Buildings & Improvements, Total cost 9,238      
Total 10,844      
Accumulated Depreciation 1,658      
Net Real Estate $ 9,186      
Year Construction/ Improvements 1994      
Date Acquired Feb. 16, 2007      
Tulsa, Oklahoma Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 7,220      
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 4,158      
Net Real Estate $ 9,899      
Year Construction/ Improvements 2004      
Date Acquired Mar. 01, 2007      
Hialeah, Florida Industrial Building [Member]        
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 713      
Land, Total cost 3,562      
Buildings & Improvements, Total cost 7,385      
Total 10,947      
Accumulated Depreciation 1,841      
Net Real Estate $ 9,106      
Year Construction/ Improvements 1956      
Year Construction/Improvements One 1992      
Date Acquired Mar. 09, 2007      
Tewksbury, Massachusetts Industrial Building [Member]        
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 52      
Land, Total cost 1,395      
Buildings & Improvements, Total cost 8,945      
Total 10,340      
Accumulated Depreciation 2,381      
Net Real Estate $ 7,959      
Year Construction/ Improvements 1985      
Year Construction/Improvements One 1989      
Date Acquired May 17, 2007      
Mason, Ohio Retail Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 4,391      
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 1,229      
Net Real Estate $ 4,933      
Year Construction/ Improvements 2007      
Date Acquired Jul. 01, 2007      
Cicero, New York Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 3,551      
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 1,199      
Net Real Estate $ 4,119      
Year Construction/ Improvements 2005      
Date Acquired Sep. 06, 2007      
Grand Rapids, Michigan Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 5,547      
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 2,611      
Net Real Estate $ 9,826      
Year Construction/ Improvements 2001      
Date Acquired Sep. 28, 2007      
Bollingbrook, Illinois Industrial Building [Member]        
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 846      
Land, Total cost 1,272      
Buildings & Improvements, Total cost 5,849      
Total 7,121      
Accumulated Depreciation 1,348      
Net Real Estate $ 5,773      
Year Construction/ Improvements 2002      
Date Acquired Sep. 28, 2007      
Decatur, Georgia Medical Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 696      
Land, Initial Cost 784      
Buildings & Improvements, Initial Cost 3,245      
Improvement Costs Capitalized Subsequent to Acquisition 585      
Land, Total cost 784      
Buildings & Improvements, Total cost 3,830      
Total 4,614      
Accumulated Depreciation 858      
Net Real Estate $ 3,756      
Year Construction/ Improvements 1989      
Date Acquired Dec. 13, 2007      
Decatur, Georgia Medical Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 182      
Land, Initial Cost 205      
Buildings & Improvements, Initial Cost 848      
Improvement Costs Capitalized Subsequent to Acquisition 153      
Land, Total cost 205      
Buildings & Improvements, Total cost 1,001      
Total 1,206      
Accumulated Depreciation 224      
Net Real Estate $ 982      
Year Construction/ Improvements 1989      
Date Acquired Dec. 13, 2007      
Decatur, Georgia Medical Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 228      
Land, Initial Cost 257      
Buildings & Improvements, Initial Cost 1,064      
Improvement Costs Capitalized Subsequent to Acquisition 192      
Land, Total cost 257      
Buildings & Improvements, Total cost 1,256      
Total 1,513      
Accumulated Depreciation 281      
Net Real Estate $ 1,232      
Year Construction/ Improvements 1989      
Date Acquired Dec. 13, 2007      
Lawrenceville, Georgia Medical Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 603      
Land, Initial Cost 679      
Buildings & Improvements, Initial Cost 2,809      
Improvement Costs Capitalized Subsequent to Acquisition 506      
Land, Total cost 679      
Buildings & Improvements, Total cost 3,315      
Total 3,994      
Accumulated Depreciation 743      
Net Real Estate $ 3,251      
Year Construction/ Improvements 2005      
Date Acquired Dec. 13, 2007      
Snellville, Georgia Medical Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 156      
Land, Initial Cost 176      
Buildings & Improvements, Initial Cost 729      
Improvement Costs Capitalized Subsequent to Acquisition 131      
Land, Total cost 176      
Buildings & Improvements, Total cost 860      
Total 1,036      
Accumulated Depreciation 193      
Net Real Estate $ 843      
Year Construction/ Improvements 1986      
Date Acquired Dec. 13, 2007      
Covington, Georgia Medical Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 206      
Land, Initial Cost 232      
Buildings & Improvements, Initial Cost 959      
Improvement Costs Capitalized Subsequent to Acquisition 173      
Land, Total cost 232      
Buildings & Improvements, Total cost 1,132      
Total 1,364      
Accumulated Depreciation 254      
Net Real Estate $ 1,110      
Year Construction/ Improvements 2000      
Date Acquired Dec. 13, 2007      
Cumming, Georgia Medical Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 656      
Land, Initial Cost 738      
Buildings & Improvements, Initial Cost 3,055      
Improvement Costs Capitalized Subsequent to Acquisition 550      
Land, Total cost 738      
Buildings & Improvements, Total cost 3,605      
Total 4,343      
Accumulated Depreciation 808      
Net Real Estate $ 3,535      
Year Construction/ Improvements 2004      
Date Acquired Dec. 13, 2007      
Conyers, Georgia Medical Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 264      
Land, Initial Cost 297      
Buildings & Improvements, Initial Cost 1,228      
Improvement Costs Capitalized Subsequent to Acquisition 221      
Land, Total cost 297      
Buildings & Improvements, Total cost 1,449      
Total 1,746      
Accumulated Depreciation 325      
Net Real Estate $ 1,421      
Year Construction/ Improvements 1994      
Date Acquired Dec. 13, 2007      
Reading, Pennsylvania Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 3,789      
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 1,423      
Net Real Estate $ 5,270      
Year Construction/ Improvements 2007      
Date Acquired Jan. 29, 2008      
Fridley, Minnesota Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 4,904      
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 2,330      
Net Real Estate $ 7,497      
Year Construction/ Improvements 1985      
Year Construction/Improvements One 2006      
Date Acquired Feb. 26, 2008      
Concord Township, Ohio Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 0      
Land, Initial Cost 1,796      
Buildings & Improvements, Initial Cost 11,154      
Improvement Costs Capitalized Subsequent to Acquisition (10)      
Land, Total cost 1,786      
Buildings & Improvements, Total cost 11,154      
Total 12,940      
Accumulated Depreciation 2,658      
Net Real Estate $ 10,282      
Year Construction/ Improvements 1957      
Year Construction/Improvements One 2008      
Date Acquired Mar. 31, 2008      
Pineville, North Carolina Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 2,202      
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 696      
Net Real Estate $ 3,007      
Year Construction/ Improvements 1985      
Date Acquired Apr. 30, 2008      
Marietta, Ohio Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 5,375      
Land, Initial Cost 829      
Buildings & Improvements, Initial Cost 6,607      
Improvement Costs Capitalized Subsequent to Acquisition 209      
Land, Total cost 829      
Buildings & Improvements, Total cost 6,816      
Total 7,645      
Accumulated Depreciation 1,460      
Net Real Estate $ 6,185      
Year Construction/ Improvements 1992      
Year Construction/Improvements One 2007      
Date Acquired Aug. 29, 2008      
Chalfont, Pennsylvania Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 5,577      
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 1,653      
Net Real Estate $ 6,343      
Year Construction/ Improvements 1987      
Date Acquired Aug. 29, 2008      
Orange City, Iowa Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 7,951      
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 1,109      
Net Real Estate $ 5,016      
Year Construction/ Improvements 1990      
Date Acquired Dec. 15, 2010      
Hickory, North Carolina Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 6,413      
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 1,725      
Net Real Estate $ 6,043      
Year Construction/ Improvements 2008      
Date Acquired Apr. 04, 2011      
Springfield, Missouri Office Building [Member]        
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 2,004      
Net Real Estate $ 11,734      
Year Construction/ Improvements 2006      
Date Acquired Jun. 20, 2011      
Boston Heights, Ohio Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 2,534      
Land, Initial Cost 449      
Buildings & Improvements, Initial Cost 3,010      
Improvement Costs Capitalized Subsequent to Acquisition 0      
Land, Total cost 449      
Buildings & Improvements, Total cost 3,010      
Total 3,459      
Accumulated Depreciation 696      
Net Real Estate $ 2,763      
Year Construction/ Improvements 2011      
Date Acquired Oct. 20, 2011      
Parsippany, New Jersey Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 6,497      
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 1,401      
Net Real Estate $ 7,453      
Year Construction/ Improvements 1984      
Date Acquired Oct. 28, 2011      
Dartmouth, Massachusetts Retail Location [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 3,824      
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 605      
Net Real Estate $ 3,631      
Year Construction/ Improvements 2011      
Date Acquired Nov. 18, 2011      
Springfield, Missouri Retail Location [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 1,646      
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 415      
Net Real Estate $ 1,860      
Year Construction/ Improvements 2005      
Date Acquired Dec. 13, 2011      
Pittsburgh, Pennsylvania Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 2,605      
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 586      
Net Real Estate $ 3,643      
Year Construction/ Improvements 1968      
Date Acquired Dec. 28, 2011      
Ashburn, Virginia Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 6,870      
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 1,293      
Net Real Estate $ 7,271      
Year Construction/ Improvements 2002      
Date Acquired Jan. 25, 2012      
Ottumwa, Iowa Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 3,926      
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 886      
Net Real Estate $ 4,685      
Year Construction/ Improvements 1970      
Date Acquired May 30, 2012      
New Albany, Ohio Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 8,426      
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 1,474      
Net Real Estate $ 8,930      
Year Construction/ Improvements 2007      
Date Acquired Jun. 05, 2012      
Columbus, Georgia Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 4,298      
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 844      
Net Real Estate $ 5,054      
Year Construction/ Improvements 2012      
Date Acquired Jun. 21, 2012      
Columbus, Ohio Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 2,702      
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 521      
Net Real Estate $ 2,566      
Year Construction/ Improvements 1981      
Date Acquired Jun. 28, 2012      
Jupiter, Florida Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 9,761      
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 1,559      
Net Real Estate $ 11,595      
Year Construction/ Improvements 2011      
Date Acquired Sep. 26, 2012      
Fort Worth, Texas Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 12,920      
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 1,975      
Net Real Estate $ 14,635      
Year Construction/ Improvements 2005      
Date Acquired Nov. 08, 2012      
Columbia, South Carolina Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 17,094      
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 3,634      
Net Real Estate $ 18,927      
Year Construction/ Improvements 2010      
Date Acquired Nov. 21, 2012      
Egg Harbor, New Jersey Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 3,367      
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 451      
Net Real Estate $ 4,508      
Year Construction/ Improvements 1985      
Date Acquired Mar. 28, 2013      
Vance, Alabama Industrial Building [Member]        
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 2,534      
Land, Total cost 456      
Buildings & Improvements, Total cost 13,064      
Total 13,520      
Accumulated Depreciation 1,339      
Net Real Estate $ 12,181      
Year Construction/ Improvements 2013      
Date Acquired May 09, 2013      
Blaine, Minnesota Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 7,783      
Land, Initial Cost 1,060      
Buildings & Improvements, Initial Cost 10,519      
Improvement Costs Capitalized Subsequent to Acquisition 0      
Land, Total cost 1,060      
Buildings & Improvements, Total cost 10,519      
Total 11,579      
Accumulated Depreciation 1,661      
Net Real Estate $ 9,918      
Year Construction/ Improvements 2009      
Date Acquired May 10, 2013      
Austin, Texas Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 33,442      
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 7,797      
Net Real Estate $ 38,676      
Year Construction/ Improvements 1999      
Date Acquired Jul. 09, 2013      
Allen, Texas Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 8,389      
Land, Initial Cost 2,699      
Buildings & Improvements, Initial Cost 7,945      
Improvement Costs Capitalized Subsequent to Acquisition 0      
Land, Total cost 2,699      
Buildings & Improvements, Total cost 7,945      
Total 10,644      
Accumulated Depreciation 1,418      
Net Real Estate $ 9,226      
Year Construction/ Improvements 1998      
Date Acquired Jul. 10, 2013      
Englewood, Colorado Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 10,835      
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 1,580      
Net Real Estate $ 11,662      
Year Construction/ Improvements 2008      
Date Acquired Dec. 11, 2013      
Novi, Michigan Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 4,116      
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 585      
Net Real Estate $ 5,393      
Year Construction/ Improvements 1988      
Date Acquired Dec. 27, 2013      
Allen, Texas Retail Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 3,138      
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 346      
Net Real Estate $ 4,162      
Year Construction/ Improvements 2004      
Date Acquired Mar. 27, 2014      
Colleyville, Texas Retail Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 2,902      
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 263      
Net Real Estate $ 3,438      
Year Construction/ Improvements 2000      
Date Acquired Mar. 27, 2014      
Rancho Cordova, California Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 4,817      
Land, Initial Cost 752      
Buildings & Improvements, Initial Cost 6,176      
Improvement Costs Capitalized Subsequent to Acquisition 44      
Land, Total cost 752      
Buildings & Improvements, Total cost 6,220      
Total 6,972      
Accumulated Depreciation 586      
Net Real Estate $ 6,386      
Year Construction/ Improvements 1986      
Date Acquired Apr. 22, 2014      
Coppell, Texas Retail Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 3,334      
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 304      
Net Real Estate $ 4,493      
Year Construction/ Improvements 2005      
Date Acquired May 08, 2014      
Columbus, Ohio (3) Office Building [Member]        
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 1,309      
Land, Total cost 990      
Buildings & Improvements, Total cost 9,326      
Total 10,316      
Accumulated Depreciation 1,165      
Net Real Estate $ 9,151      
Year Construction/ Improvements 1986      
Date Acquired May 13, 2014      
Taylor, Pennsylvania Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 22,422      
Land, Initial Cost 3,102      
Buildings & Improvements, Initial Cost 25,405      
Improvement Costs Capitalized Subsequent to Acquisition 0      
Land, Total cost 3,101      
Buildings & Improvements, Total cost 25,406      
Total 28,507      
Accumulated Depreciation 2,061      
Net Real Estate $ 26,446      
Year Construction/ Improvements 2000      
Year Construction/Improvements One 2006      
Date Acquired Jun. 09, 2014      
Aurora, Colorado Industrial Building [Member]        
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 408      
Net Real Estate $ 6,487      
Year Construction/ Improvements 1983      
Date Acquired Jul. 01, 2014      
Indianapolis, Indiana Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 6,072      
Land, Initial Cost 502      
Buildings & Improvements, Initial Cost 6,422      
Improvement Costs Capitalized Subsequent to Acquisition 287      
Land, Total cost 498      
Buildings & Improvements, Total cost 6,713      
Total 7,211      
Accumulated Depreciation 726      
Net Real Estate $ 6,485      
Year Construction/ Improvements 1981      
Year Construction/Improvements One 2014      
Date Acquired Sep. 03, 2014      
Denver, Colorado Industrial Building [Member]        
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 597      
Net Real Estate $ 8,338      
Year Construction/ Improvements 1985      
Date Acquired Oct. 31, 2014      
Monroe, Michigan Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 10,479      
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 917      
Net Real Estate $ 14,348      
Year Construction/ Improvements 2004      
Date Acquired Dec. 23, 2014      
Monroe, Michigan Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 7,335      
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 642      
Net Real Estate $ 10,043      
Year Construction/ Improvements 2004      
Date Acquired Dec. 23, 2014      
Richardson, Texas Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 14,145      
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 1,255      
Net Real Estate $ 16,911      
Year Construction/ Improvements 1985      
Year Construction/Improvements One 2008      
Date Acquired Mar. 06, 2015      
Birmingham, Alabama Office Building [Member]        
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 19      
Land, Total cost 650      
Buildings & Improvements, Total cost 2,053      
Total 2,703      
Accumulated Depreciation 175      
Net Real Estate $ 2,528      
Year Construction/ Improvements 1982      
Year Construction/Improvements One 2010      
Date Acquired Mar. 20, 2015      
Dublin, Ohio Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 4,306      
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 387      
Net Real Estate $ 6,044      
Year Construction/ Improvements 1980      
Date Acquired May 28, 2015      
Draper, Utah Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 12,891      
Land, Initial Cost 3,248      
Buildings & Improvements, Initial Cost 13,129      
Improvement Costs Capitalized Subsequent to Acquisition 0      
Land, Total cost 3,248      
Buildings & Improvements, Total cost 13,129      
Total 16,377      
Accumulated Depreciation 845      
Net Real Estate $ 15,532      
Year Construction/ Improvements 2008      
Date Acquired May 29, 2015      
Hapeville, Georgia Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 7,376      
Land, Initial Cost 2,271      
Buildings & Improvements, Initial Cost 8,778      
Improvement Costs Capitalized Subsequent to Acquisition 0      
Land, Total cost 2,271      
Buildings & Improvements, Total cost 8,778      
Total 11,049      
Accumulated Depreciation 497      
Net Real Estate $ 10,552      
Year Construction/ Improvements 1999      
Year Construction/Improvements One 2007      
Date Acquired Jul. 15, 2015      
Villa Rica, Georgia Industrial Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 3,737      
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 236      
Net Real Estate $ 5,352      
Year Construction/ Improvements 2000      
Year Construction/Improvements One 2014      
Date Acquired Oct. 20, 2015      
Taylorsville, Utah Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 9,782      
Land, Initial Cost 3,008      
Buildings & Improvements, Initial Cost 10,659      
Improvement Costs Capitalized Subsequent to Acquisition 0      
Land, Total cost 3,008      
Buildings & Improvements, Total cost 10,659      
Total 13,667      
Accumulated Depreciation 343      
Net Real Estate $ 13,324      
Year Construction/ Improvements 1997      
Date Acquired May 26, 2016      
Fort Lauderdale, Florida Office Building [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, Initial Cost $ 14,047      
Land, Initial Cost 4,117      
Buildings & Improvements, Initial Cost 15,516      
Improvement Costs Capitalized Subsequent to Acquisition 0      
Land, Total cost 4,117      
Buildings & Improvements, Total cost 15,516      
Total 19,633      
Accumulated Depreciation 204      
Net Real Estate $ 19,429      
Year Construction/ Improvements 1984      
Date Acquired Sep. 12, 2016      
King of Prussia, Pennsylvania Office Building [Member]        
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 35      
Net Real Estate $ 19,385      
Year Construction/ Improvements 2001      
Date Acquired Dec. 14, 2016