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Schedule III: Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 297,716      
Land 919,414      
Buildings and Improvements 1,526,633      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,227,597      
Land 909,318      
Buildings and Improvements 2,764,326      
Total 3,673,644      
Accumulated Depreciation 12/31/2018 $ 811,784 $ 789,919 $ 797,919 $ 792,501
1650 Highway 155 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) McDonough, GA      
Land $ 779      
Buildings and Improvements 4,544      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (669)      
Land 345      
Buildings and Improvements 4,309      
Total 4,654      
Accumulated Depreciation 12/31/2018 $ 2,573      
4051 Southmeadow Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Atlanta, GA      
Land $ 726      
Buildings and Improvements 4,130      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,666      
Land 726      
Buildings and Improvements 5,796      
Total 6,522      
Accumulated Depreciation 12/31/2018 $ 3,072      
4071 Southmeadow Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Atlanta, GA      
Land $ 750      
Buildings and Improvements 4,460      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,929      
Land 828      
Buildings and Improvements 6,311      
Total 7,139      
Accumulated Depreciation 12/31/2018 $ 3,522      
4081 Southmeadow Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Atlanta, GA      
Land $ 1,012      
Buildings and Improvements 5,918      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 2,088      
Land 1,157      
Buildings and Improvements 7,861      
Total 9,018      
Accumulated Depreciation 12/31/2018 $ 4,320      
5570 Tulane Dr [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Atlanta, GA      
Encumbrances $ 2,055      
Land 527      
Buildings and Improvements 2,984      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,255      
Land 546      
Buildings and Improvements 4,220      
Total 4,766      
Accumulated Depreciation 12/31/2018 $ 2,114      
955 Cobb Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Kennesaw, GA      
Encumbrances $ 2,688      
Land 780      
Buildings and Improvements 4,420      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,032      
Land 804      
Buildings and Improvements 5,428      
Total 6,232      
Accumulated Depreciation 12/31/2018 $ 2,783      
1005 Sigman Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Conyers, GA      
Encumbrances $ 2,125      
Land 566      
Buildings and Improvements 3,134      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,226      
Land 574      
Buildings and Improvements 4,352      
Total 4,926      
Accumulated Depreciation 12/31/2018 $ 1,804      
2050 East Park Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Conyers, GA      
Land $ 452      
Buildings and Improvements 2,504      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 860      
Land 459      
Buildings and Improvements 3,357      
Total 3,816      
Accumulated Depreciation 12/31/2018 $ 1,476      
3060 South Park Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Ellenwood, GA      
Land $ 1,600      
Buildings and Improvements 12,464      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 3,202      
Land 1,604      
Buildings and Improvements 15,662      
Total 17,266      
Accumulated Depreciation 12/31/2018 $ 5,925      
175 Greenwood Industrial Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) McDonough, GA      
Encumbrances $ 3,987      
Land 1,550      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 7,695      
Land 1,550      
Buildings and Improvements 7,695      
Total 9,245      
Accumulated Depreciation 12/31/2018 $ 2,824      
5095 Phillip Lee Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Atlanta, GA      
Land $ 735      
Buildings and Improvements 3,627      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 447      
Land 740      
Buildings and Improvements 4,069      
Total 4,809      
Accumulated Depreciation 12/31/2018 $ 3,405      
6514 Warren Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Norcross, GA      
Land $ 510      
Buildings and Improvements 1,250      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 127      
Land 513      
Buildings and Improvements 1,374      
Total 1,887      
Accumulated Depreciation 12/31/2018 $ 610      
6544 Warren Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Norcross, GA      
Land $ 711      
Buildings and Improvements 2,310      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 332      
Land 715      
Buildings and Improvements 2,638      
Total 3,353      
Accumulated Depreciation 12/31/2018 $ 1,309      
5356 E. Ponce De Leon [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Stone Mountain, GA      
Land $ 604      
Buildings and Improvements 3,888      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 572      
Land 610      
Buildings and Improvements 4,454      
Total 5,064      
Accumulated Depreciation 12/31/2018 $ 2,515      
5390 E. Ponce De Leon [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Stone Mountain, GA      
Land $ 397      
Buildings and Improvements 1,791      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 529      
Land 402      
Buildings and Improvements 2,315      
Total 2,717      
Accumulated Depreciation 12/31/2018 $ 1,053      
1755 Enterprise Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Buford, GA      
Encumbrances $ 1,127      
Land 712      
Buildings and Improvements 2,118      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (217)      
Land 716      
Buildings and Improvements 1,897      
Total 2,613      
Accumulated Depreciation 12/31/2018 $ 890      
4555 Atwater Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Buford, GA      
Encumbrances $ 1,980      
Land 881      
Buildings and Improvements 3,550      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 161      
Land 885      
Buildings and Improvements 3,707      
Total 4,592      
Accumulated Depreciation 12/31/2018 $ 1,517      
80 Liberty Industrial Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) McDonough, GA      
Land $ 756      
Buildings and Improvements 3,695      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (1,560)      
Land 467      
Buildings and Improvements 2,424      
Total 2,891      
Accumulated Depreciation 12/31/2018 $ 1,037      
596 Bonnie Valentine [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Pendergrass, GA      
Land $ 2,580      
Buildings and Improvements 21,730      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 2,890      
Land 2,594      
Buildings and Improvements 24,606      
Total 27,200      
Accumulated Depreciation 12/31/2018 $ 7,718      
11415 Old Roswell Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Alpharetta, GA      
Land $ 2,403      
Buildings and Improvements 1,912      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 808      
Land 2,428      
Buildings and Improvements 2,695      
Total 5,123      
Accumulated Depreciation 12/31/2018 $ 1,032      
1281 Highway 155 S. [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) McDonough, GA      
Land $ 2,501      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 17,056      
Land 2,502      
Buildings and Improvements 17,055      
Total 19,557      
Accumulated Depreciation 12/31/2018 $ 1,149      
22520 Randolph Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Dulles, VA      
Land $ 3,200      
Buildings and Improvements 8,187      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 187      
Land 3,208      
Buildings and Improvements 8,366      
Total 11,574      
Accumulated Depreciation 12/31/2018 $ 2,466      
22630 Dulles Summit Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Dulles, VA      
Land $ 2,200      
Buildings and Improvements 9,346      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (903)      
Land 2,206      
Buildings and Improvements 8,437      
Total 10,643      
Accumulated Depreciation 12/31/2018 $ 2,723      
11204 McCormick Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Hunt Valley, MD      
Land $ 1,017      
Buildings and Improvements 3,132      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 195      
Land 1,038      
Buildings and Improvements 3,306      
Total 4,344      
Accumulated Depreciation 12/31/2018 $ 1,776      
11110 Pepper Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Hunt Valley, MD      
Land $ 918      
Buildings and Improvements 2,529      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 476      
Land 938      
Buildings and Improvements 2,985      
Total 3,923      
Accumulated Depreciation 12/31/2018 $ 1,470      
11100-11120 Gilroy Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Hunt Valley, MD      
Land $ 901      
Buildings and Improvements 1,455      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 67      
Land 919      
Buildings and Improvements 1,504      
Total 2,423      
Accumulated Depreciation 12/31/2018 $ 762      
10709 Gilroy Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Hunt Valley, MD      
Encumbrances $ 1,777      
Land 913      
Buildings and Improvements 2,705      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (86)      
Land 913      
Buildings and Improvements 2,619      
Total 3,532      
Accumulated Depreciation 12/31/2018 $ 1,740      
10707 Gilroy Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Hunt Valley, MD      
Land $ 1,111      
Buildings and Improvements 3,819      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 795      
Land 1,136      
Buildings and Improvements 4,589      
Total 5,725      
Accumulated Depreciation 12/31/2018 $ 2,402      
38 Loveton Circle [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Sparks, MD      
Land $ 1,648      
Buildings and Improvements 2,151      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (192)      
Land 1,690      
Buildings and Improvements 1,917      
Total 3,607      
Accumulated Depreciation 12/31/2018 $ 1,051      
1225 Bengies Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Baltimore, MD      
Land $ 2,640      
Buildings and Improvements 270      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 13,331      
Land 2,823      
Buildings and Improvements 13,418      
Total 16,241      
Accumulated Depreciation 12/31/2018 $ 4,486      
400 Old Post Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Aberdeen, MD      
Land $ 3,411      
Buildings and Improvements 17,144      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,514      
Land 3,411      
Buildings and Improvements 18,658      
Total 22,069      
Accumulated Depreciation 12/31/2018 $ 2,614      
500 Old Post Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Aberdeen, MD      
Land $ 5,959      
Buildings and Improvements 30,533      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 146      
Land 5,959      
Buildings and Improvements 30,679      
Total 36,638      
Accumulated Depreciation 12/31/2018 $ 3,926      
1214-B Freedom Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Cranberry Township, PA      
Land $ 31      
Buildings and Improvements 994      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 613      
Land 200      
Buildings and Improvements 1,438      
Total 1,638      
Accumulated Depreciation 12/31/2018 $ 1,385      
401 Russell Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Middletown, PA      
Land $ 262      
Buildings and Improvements 857      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,829      
Land 287      
Buildings and Improvements 2,661      
Total 2,948      
Accumulated Depreciation 12/31/2018 $ 2,243      
2700 Commerce Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Middletown, PA      
Land $ 196      
Buildings and Improvements 997      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 800      
Land 206      
Buildings and Improvements 1,787      
Total 1,993      
Accumulated Depreciation 12/31/2018 $ 1,587      
2701 Commerce Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Middletown, PA      
Land $ 141      
Buildings and Improvements 859      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,399      
Land 164      
Buildings and Improvements 2,235      
Total 2,399      
Accumulated Depreciation 12/31/2018 $ 1,692      
2780 Commerce Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Middletown, PA      
Land $ 113      
Buildings and Improvements 743      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,209      
Land 209      
Buildings and Improvements 1,856      
Total 2,065      
Accumulated Depreciation 12/31/2018 $ 1,604      
350 Old Silver Spring Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Mechanicsburg, PA      
Land $ 510      
Buildings and Improvements 2,890      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 5,936      
Land 541      
Buildings and Improvements 8,795      
Total 9,336      
Accumulated Depreciation 12/31/2018 $ 4,223      
16522 Hunters Green Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Hagerstown, MD      
Land $ 1,390      
Buildings and Improvements 13,104      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 5,656      
Land 1,863      
Buildings and Improvements 18,287      
Total 20,150      
Accumulated Depreciation 12/31/2018 $ 6,151      
18212 Shawley Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Hagerstown, MD      
Land $ 1,000      
Buildings and Improvements 5,847      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 2,800      
Land 1,016      
Buildings and Improvements 8,631      
Total 9,647      
Accumulated Depreciation 12/31/2018 $ 2,544      
37 Valley View Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Jessup, PA      
Land $ 542      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 3,205      
Land 532      
Buildings and Improvements 3,215      
Total 3,747      
Accumulated Depreciation 12/31/2018 $ 1,099      
14 McFadden Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Palmer, PA      
Land $ 600      
Buildings and Improvements 1,349      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (274)      
Land 625      
Buildings and Improvements 1,050      
Total 1,675      
Accumulated Depreciation 12/31/2018 $ 401      
431 Railroad Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Shiremanstown, PA      
Land $ 1,293      
Buildings and Improvements 7,164      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 2,035      
Land 1,341      
Buildings and Improvements 9,151      
Total 10,492      
Accumulated Depreciation 12/31/2018 $ 5,281      
6951 Allentown Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Harrisburg, PA      
Land $ 585      
Buildings and Improvements 3,176      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (27)      
Land 601      
Buildings and Improvements 3,133      
Total 3,734      
Accumulated Depreciation 12/31/2018 $ 1,324      
320 Reliance Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Washington, PA      
Land $ 201      
Buildings and Improvements 1,819      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (348)      
Land 178      
Buildings and Improvements 1,494      
Total 1,672      
Accumulated Depreciation 12/31/2018 $ 943      
2801 Red Lion Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Philadelphia, PA      
Land $ 950      
Buildings and Improvements 5,916      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 7      
Land 964      
Buildings and Improvements 5,909      
Total 6,873      
Accumulated Depreciation 12/31/2018 $ 3,168      
1351 Eisenhower Blvd., Bldg 1 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Harrisburg, PA      
Land $ 382      
Buildings and Improvements 2,343      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 3      
Land 387      
Buildings and Improvements 2,341      
Total 2,728      
Accumulated Depreciation 12/31/2018 $ 855      
1351 Eisenhower Blvd., Bldg 2 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Harrisburg, PA      
Land $ 436      
Buildings and Improvements 1,587      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (233)      
Land 443      
Buildings and Improvements 1,347      
Total 1,790      
Accumulated Depreciation 12/31/2018 $ 513      
200 Cascade Drive, Bldg. 1 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Allentown, PA      
Land $ 2,133      
Buildings and Improvements 17,562      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 338      
Land 2,769      
Buildings and Improvements 17,264      
Total 20,033      
Accumulated Depreciation 12/31/2018 $ 7,704      
200 Cascade Drive, Bldg. 2 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Allentown, PA      
Land $ 310      
Buildings and Improvements 2,268      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 68      
Land 316      
Buildings and Improvements 2,330      
Total 2,646      
Accumulated Depreciation 12/31/2018 $ 907      
1490 Dennison Circle [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Carlisle, PA      
Land $ 1,500      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 13,198      
Land 2,341      
Buildings and Improvements 12,357      
Total 14,698      
Accumulated Depreciation 12/31/2018 $ 3,816      
298 First Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Covington Twp, PA      
Land $ 7,022      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 57,053      
Land 7,019      
Buildings and Improvements 57,056      
Total 64,075      
Accumulated Depreciation 12/31/2018 $ 14,712      
225 Cross Farm Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) York, PA      
Land $ 4,718      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 23,163      
Land 4,715      
Buildings and Improvements 23,166      
Total 27,881      
Accumulated Depreciation 12/31/2018 $ 6,520      
6300 Bristol Pike [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Levittown, PA      
Land $ 1,074      
Buildings and Improvements 2,642      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (110)      
Land 964      
Buildings and Improvements 2,642      
Total 3,606      
Accumulated Depreciation 12/31/2018 $ 2,276      
2455 Boulevard of Generals [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Norristown, PA      
Encumbrances $ 2,997      
Land 1,200      
Buildings and Improvements 4,800      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 950      
Land 1,226      
Buildings and Improvements 5,724      
Total 6,950      
Accumulated Depreciation 12/31/2018 $ 2,370      
105 Steamboat Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Manchester, PA      
Land $ 4,085      
Buildings and Improvements 14,464      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 11      
Land 4,070      
Buildings and Improvements 14,490      
Total 18,560      
Accumulated Depreciation 12/31/2018 $ 4,034      
20 Leo Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) York County, PA      
Land $ 6,884      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 27,480      
Land 6,889      
Buildings and Improvements 27,475      
Total 34,364      
Accumulated Depreciation 12/31/2018 $ 3,411      
3895 Eastgate Blvd Bldg A [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Easton, PA      
Land $ 4,855      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 17,824      
Land 4,388      
Buildings and Improvements 18,291      
Total 22,679      
Accumulated Depreciation 12/31/2018 $ 1,637      
3895 Eastgate Blvd Bldg B [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Easton, PA      
Land $ 3,459      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 13,818      
Land 3,128      
Buildings and Improvements 14,149      
Total 17,277      
Accumulated Depreciation 12/31/2018 $ 1,419      
112 Bordnersville Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Jonestown, PA      
Land $ 13,702      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 30,341      
Land 13,724      
Buildings and Improvements 30,319      
Total 44,043      
Accumulated Depreciation 12/31/2018 $ 179      
122 Bordnersville Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Jonestown, PA      
Land $ 3,165      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 10,937      
Land 3,171      
Buildings and Improvements 10,931      
Total 14,102      
Accumulated Depreciation 12/31/2018 $ 0      
720-730 Landwehr Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Northbrook, IL      
Land $ 521      
Buildings and Improvements 2,982      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 911      
Land 521      
Buildings and Improvements 3,893      
Total 4,414      
Accumulated Depreciation 12/31/2018 $ 2,201      
1385 101st Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Lemont, IL      
Encumbrances $ 3,465      
Land 967      
Buildings and Improvements 5,554      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,513      
Land 968      
Buildings and Improvements 7,066      
Total 8,034      
Accumulated Depreciation 12/31/2018 $ 3,907      
2300 Windsor Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Addison, IL      
Land $ 688      
Buildings and Improvements 3,943      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 761      
Land 696      
Buildings and Improvements 4,696      
Total 5,392      
Accumulated Depreciation 12/31/2018 $ 2,660      
305-311 Era Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Northbrook, IL      
Land $ 200      
Buildings and Improvements 1,154      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,299      
Land 205      
Buildings and Improvements 2,448      
Total 2,653      
Accumulated Depreciation 12/31/2018 $ 1,128      
800 Business Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Mount Prospect, IL      
Land $ 631      
Buildings and Improvements 3,493      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 328      
Land 666      
Buildings and Improvements 3,786      
Total 4,452      
Accumulated Depreciation 12/31/2018 $ 1,720      
580 Slawin Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Mount Prospect, IL      
Encumbrances $ 716      
Land 233      
Buildings and Improvements 1,292      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (27)      
Land 162      
Buildings and Improvements 1,336      
Total 1,498      
Accumulated Depreciation 12/31/2018 $ 735      
1005 101st Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Lemont, IL      
Encumbrances $ 4,761      
Land 1,200      
Buildings and Improvements 6,643      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,619      
Land 1,220      
Buildings and Improvements 8,242      
Total 9,462      
Accumulated Depreciation 12/31/2018 $ 3,321      
175 Wall Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Glendale Heights, IL      
Encumbrances $ 1,509      
Land 427      
Buildings and Improvements 2,363      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 709      
Land 433      
Buildings and Improvements 3,066      
Total 3,499      
Accumulated Depreciation 12/31/2018 $ 1,113      
251 Airport Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) North Aurora, IL      
Encumbrances $ 3,491      
Land 983      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 6,403      
Land 983      
Buildings and Improvements 6,403      
Total 7,386      
Accumulated Depreciation 12/31/2018 $ 2,485      
400 Crossroads Pkwy [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Bolingbrook, IL      
Encumbrances $ 5,108      
Land 1,178      
Buildings and Improvements 9,453      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,212      
Land 1,181      
Buildings and Improvements 10,662      
Total 11,843      
Accumulated Depreciation 12/31/2018 $ 4,568      
7801 W. Industrial Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Forest Park, IL      
Land $ 1,215      
Buildings and Improvements 3,020      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,314      
Land 1,220      
Buildings and Improvements 4,329      
Total 5,549      
Accumulated Depreciation 12/31/2018 $ 2,061      
725 Kimberly Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Carol Stream, IL      
Land $ 793      
Buildings and Improvements 1,395      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 255      
Land 801      
Buildings and Improvements 1,642      
Total 2,443      
Accumulated Depreciation 12/31/2018 $ 894      
17001 S. Vincennes [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Thornton, IL      
Land $ 497      
Buildings and Improvements 504      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 3      
Land 513      
Buildings and Improvements 491      
Total 1,004      
Accumulated Depreciation 12/31/2018 $ 417      
2900 W. 166th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Markham, IL      
Land $ 1,132      
Buildings and Improvements 4,293      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (881)      
Land 1,134      
Buildings and Improvements 3,410      
Total 4,544      
Accumulated Depreciation 12/31/2018 $ 1,275      
555 W. Algonquin Rd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Arlington Heights, IL      
Encumbrances $ 1,849      
Land 574      
Buildings and Improvements 741      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,951      
Land 579      
Buildings and Improvements 2,687      
Total 3,266      
Accumulated Depreciation 12/31/2018 $ 1,086      
1501 Oakton Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Elk Grove Village, IL      
Encumbrances $ 4,843      
Land 3,369      
Buildings and Improvements 6,121      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 134      
Land 3,482      
Buildings and Improvements 6,142      
Total 9,624      
Accumulated Depreciation 12/31/2018 $ 2,128      
16500 W. 103rd Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Woodridge, IL      
Land $ 744      
Buildings and Improvements 2,458      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 487      
Land 762      
Buildings and Improvements 2,927      
Total 3,689      
Accumulated Depreciation 12/31/2018 $ 1,089      
8505 50th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Kenosha, WI      
Land $ 3,212      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 32,956      
Land 3,212      
Buildings and Improvements 32,956      
Total 36,168      
Accumulated Depreciation 12/31/2018 $ 9,086      
4100 Rock Creek Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Joliet, IL      
Land $ 4,476      
Buildings and Improvements 16,061      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 807      
Land 4,476      
Buildings and Improvements 16,868      
Total 21,344      
Accumulated Depreciation 12/31/2018 $ 3,744      
10100 58th Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Kenosha, WI      
Land $ 4,201      
Buildings and Improvements 17,604      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 74      
Land 4,201      
Buildings and Improvements 17,678      
Total 21,879      
Accumulated Depreciation 12/31/2018 $ 3,836      
401 Airport Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) North Aurora, IL      
Land $ 534      
Buildings and Improvements 1,957      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 12      
Land 534      
Buildings and Improvements 1,969      
Total 2,503      
Accumulated Depreciation 12/31/2018 $ 381      
3737 84th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Somers, WI      
Land $ 1,943      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 24,116      
Land 1,943      
Buildings and Improvements 24,116      
Total 26,059      
Accumulated Depreciation 12/31/2018 $ 1,652      
81 Paragon Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Romeoville, IL      
Land $ 1,787      
Buildings and Improvements 7,252      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,340      
Land 1,787      
Buildings and Improvements 8,592      
Total 10,379      
Accumulated Depreciation 12/31/2018 $ 678      
10680 88th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Pleasant Prairie, WI      
Land $ 1,376      
Buildings and Improvements 4,757      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 0      
Land 1,376      
Buildings and Improvements 4,757      
Total 6,133      
Accumulated Depreciation 12/31/2018 $ 234      
8725 31st Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Somers, WI      
Land $ 2,133      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 26,451      
Land 2,134      
Buildings and Improvements 26,450      
Total 28,584      
Accumulated Depreciation 12/31/2018 $ 1,467      
3500 Channahon Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Joliet, IL      
Land $ 2,595      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 16,729      
Land 2,598      
Buildings and Improvements 16,726      
Total 19,324      
Accumulated Depreciation 12/31/2018 $ 141      
4700-4750 Creek Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Blue Ash, OH      
Land $ 1,080      
Buildings and Improvements 6,118      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,508      
Land 1,109      
Buildings and Improvements 7,597      
Total 8,706      
Accumulated Depreciation 12/31/2018 $ 3,954      
4436 Mulhauser Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Hamilton, OH      
Land $ 630      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 5,294      
Land 630      
Buildings and Improvements 5,294      
Total 5,924      
Accumulated Depreciation 12/31/2018 $ 2,102      
4438 Mulhauser Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Hamilton, OH      
Land $ 779      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 6,407      
Land 779      
Buildings and Improvements 6,407      
Total 7,186      
Accumulated Depreciation 12/31/2018 $ 2,606      
420 Wards Corner Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Loveland, OH      
Land $ 600      
Buildings and Improvements 1,083      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,165      
Land 606      
Buildings and Improvements 2,242      
Total 2,848      
Accumulated Depreciation 12/31/2018 $ 944      
422 Wards Corner Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Loveland, OH      
Land $ 600      
Buildings and Improvements 1,811      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 443      
Land 592      
Buildings and Improvements 2,262      
Total 2,854      
Accumulated Depreciation 12/31/2018 $ 878      
4663 Dues Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Westchester, OH      
Land $ 858      
Buildings and Improvements 2,273      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 606      
Land 875      
Buildings and Improvements 2,862      
Total 3,737      
Accumulated Depreciation 12/31/2018 $ 1,859      
9345 Princeton-Glendale Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Westchester, OH      
Encumbrances $ 1,228      
Land 818      
Buildings and Improvements 1,648      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 380      
Land 840      
Buildings and Improvements 2,006      
Total 2,846      
Accumulated Depreciation 12/31/2018 $ 1,678      
9525 Glades Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Westchester, OH      
Land $ 347      
Buildings and Improvements 1,323      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 240      
Land 355      
Buildings and Improvements 1,555      
Total 1,910      
Accumulated Depreciation 12/31/2018 $ 669      
9774-9792 Windisch Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Westchester, OH      
Land $ 392      
Buildings and Improvements 1,744      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 163      
Land 394      
Buildings and Improvements 1,905      
Total 2,299      
Accumulated Depreciation 12/31/2018 $ 534      
9808-9830 Windisch Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Westchester, OH      
Land $ 395      
Buildings and Improvements 2,541      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 447      
Land 397      
Buildings and Improvements 2,986      
Total 3,383      
Accumulated Depreciation 12/31/2018 $ 1,063      
9842-9862 Windisch Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Westchester, OH      
Land $ 506      
Buildings and Improvements 3,148      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 202      
Land 508      
Buildings and Improvements 3,348      
Total 3,856      
Accumulated Depreciation 12/31/2018 $ 1,165      
9872-9898 Windisch Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Westchester, OH      
Land $ 546      
Buildings and Improvements 3,039      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 285      
Land 548      
Buildings and Improvements 3,322      
Total 3,870      
Accumulated Depreciation 12/31/2018 $ 1,254      
9902-9922 Windisch Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Westchester, OH      
Land $ 623      
Buildings and Improvements 4,003      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,104      
Land 627      
Buildings and Improvements 5,103      
Total 5,730      
Accumulated Depreciation 12/31/2018 $ 2,408      
30311 Emerald Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Glenwillow, OH      
Encumbrances $ 6,203      
Land 681      
Buildings and Improvements 11,838      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 603      
Land 691      
Buildings and Improvements 12,431      
Total 13,122      
Accumulated Depreciation 12/31/2018 $ 5,315      
30333 Emerald Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Glenwillow, OH      
Land $ 466      
Buildings and Improvements 5,447      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (615)      
Land 475      
Buildings and Improvements 4,823      
Total 5,298      
Accumulated Depreciation 12/31/2018 $ 1,898      
7800 Cochran Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Glenwillow, OH      
Encumbrances $ 3,598      
Land 972      
Buildings and Improvements 7,033      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 338      
Land 991      
Buildings and Improvements 7,352      
Total 8,343      
Accumulated Depreciation 12/31/2018 $ 3,145      
7900 Cochran Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Glenwillow, OH      
Encumbrances $ 3,382      
Land 775      
Buildings and Improvements 6,244      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 137      
Land 792      
Buildings and Improvements 6,364      
Total 7,156      
Accumulated Depreciation 12/31/2018 $ 2,789      
7905 Cochran Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Glenwillow, OH      
Encumbrances $ 3,627      
Land 920      
Buildings and Improvements 6,174      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 114      
Land 922      
Buildings and Improvements 6,286      
Total 7,208      
Accumulated Depreciation 12/31/2018 $ 2,464      
8181 Darrow Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Twinsburg, OH      
Land $ 2,478      
Buildings and Improvements 6,791      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 465      
Land 2,496      
Buildings and Improvements 7,238      
Total 9,734      
Accumulated Depreciation 12/31/2018 $ 3,825      
2406-2416 Walnut Ridge [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Dallas, TX      
Land $ 178      
Buildings and Improvements 1,006      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,140      
Land 172      
Buildings and Improvements 2,152      
Total 2,324      
Accumulated Depreciation 12/31/2018 $ 743      
2401-2419 Walnut Ridge [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Dallas, TX      
Land $ 148      
Buildings and Improvements 839      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 416      
Land 142      
Buildings and Improvements 1,261      
Total 1,403      
Accumulated Depreciation 12/31/2018 $ 615      
900-906 Great Southwest Pkwy [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Arlington, TX      
Land $ 237      
Buildings and Improvements 1,342      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 479      
Land 270      
Buildings and Improvements 1,788      
Total 2,058      
Accumulated Depreciation 12/31/2018 $ 893      
3000 West Commerce [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Dallas, TX      
Land $ 456      
Buildings and Improvements 2,584      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,156      
Land 469      
Buildings and Improvements 3,727      
Total 4,196      
Accumulated Depreciation 12/31/2018 $ 1,959      
405-407 113th [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Arlington, TX      
Land $ 181      
Buildings and Improvements 1,026      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 456      
Land 185      
Buildings and Improvements 1,478      
Total 1,663      
Accumulated Depreciation 12/31/2018 $ 717      
816 111th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Arlington, TX      
Land $ 251      
Buildings and Improvements 1,421      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 172      
Land 258      
Buildings and Improvements 1,586      
Total 1,844      
Accumulated Depreciation 12/31/2018 $ 796      
1602-1654 Terre Colony [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Dallas, TX      
Land $ 458      
Buildings and Improvements 2,596      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 864      
Land 468      
Buildings and Improvements 3,450      
Total 3,918      
Accumulated Depreciation 12/31/2018 $ 1,559      
2220 Merritt Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Garland, TX      
Land $ 352      
Buildings and Improvements 1,993      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 407      
Land 316      
Buildings and Improvements 2,436      
Total 2,752      
Accumulated Depreciation 12/31/2018 $ 987      
2485-2505 Merritt Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Garland, TX      
Land $ 431      
Buildings and Improvements 2,440      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 546      
Land 443      
Buildings and Improvements 2,974      
Total 3,417      
Accumulated Depreciation 12/31/2018 $ 1,282      
2110 Hutton Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Carrolton, TX      
Land $ 374      
Buildings and Improvements 2,117      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 404      
Land 255      
Buildings and Improvements 2,640      
Total 2,895      
Accumulated Depreciation 12/31/2018 $ 1,312      
2025 McKenzie Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Carrolton, TX      
Land $ 437      
Buildings and Improvements 2,478      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 568      
Land 442      
Buildings and Improvements 3,041      
Total 3,483      
Accumulated Depreciation 12/31/2018 $ 1,238      
2019 McKenzie Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Carrolton, TX      
Land $ 502      
Buildings and Improvements 2,843      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 625      
Land 507      
Buildings and Improvements 3,463      
Total 3,970      
Accumulated Depreciation 12/31/2018 $ 1,372      
2029-2035 McKenzie Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Carrolton, TX      
Land $ 306      
Buildings and Improvements 1,870      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 356      
Land 306      
Buildings and Improvements 2,226      
Total 2,532      
Accumulated Depreciation 12/31/2018 $ 928      
2015 McKenzie Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Carrolton, TX      
Encumbrances $ 1,830      
Land 510      
Buildings and Improvements 2,891      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 471      
Land 516      
Buildings and Improvements 3,356      
Total 3,872      
Accumulated Depreciation 12/31/2018 $ 1,497      
2009 McKenzie Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Carrolton, TX      
Encumbrances $ 1,734      
Land 476      
Buildings and Improvements 2,699      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 494      
Land 481      
Buildings and Improvements 3,188      
Total 3,669      
Accumulated Depreciation 12/31/2018 $ 1,389      
900-1100 Avenue S [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Grand Prairie, TX      
Land $ 623      
Buildings and Improvements 3,528      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,118      
Land 629      
Buildings and Improvements 4,640      
Total 5,269      
Accumulated Depreciation 12/31/2018 $ 1,749      
Plano Crossing Bus. Park [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Plano, TX      
Encumbrances $ 6,682      
Land 1,961      
Buildings and Improvements 11,112      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,062      
Land 1,981      
Buildings and Improvements 12,154      
Total 14,135      
Accumulated Depreciation 12/31/2018 $ 4,912      
825-827 Avenue H [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Arlington, TX      
Encumbrances $ 2,012      
Land 600      
Buildings and Improvements 3,006      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 393      
Land 604      
Buildings and Improvements 3,395      
Total 3,999      
Accumulated Depreciation 12/31/2018 $ 1,703      
1013-31 Avenue M [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Grand Prairie, TX      
Land $ 300      
Buildings and Improvements 1,504      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 257      
Land 302      
Buildings and Improvements 1,759      
Total 2,061      
Accumulated Depreciation 12/31/2018 $ 811      
1172-84 113th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Grand Prairie, TX      
Land $ 700      
Buildings and Improvements 3,509      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (40)      
Land 704      
Buildings and Improvements 3,465      
Total 4,169      
Accumulated Depreciation 12/31/2018 $ 1,393      
1200-16 Avenue H [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Arlington, TX      
Land $ 600      
Buildings and Improvements 2,846      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 852      
Land 604      
Buildings and Improvements 3,694      
Total 4,298      
Accumulated Depreciation 12/31/2018 $ 1,412      
1322-66 W. North Carrier Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Grand Prairie, TX      
Encumbrances $ 3,776      
Land 1,000      
Buildings and Improvements 5,012      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,491      
Land 1,006      
Buildings and Improvements 6,497      
Total 7,503      
Accumulated Depreciation 12/31/2018 $ 2,662      
2401-2407 Centennial Dr [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Arlington, TX      
Encumbrances $ 1,781      
Land 600      
Buildings and Improvements 2,534      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 634      
Land 604      
Buildings and Improvements 3,164      
Total 3,768      
Accumulated Depreciation 12/31/2018 $ 1,485      
3111 West Commerce Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Dallas, TX      
Encumbrances $ 3,111      
Land 1,000      
Buildings and Improvements 3,364      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,818      
Land 1,011      
Buildings and Improvements 5,171      
Total 6,182      
Accumulated Depreciation 12/31/2018 $ 2,483      
13800 Senlac Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Farmers Branch, TX      
Encumbrances $ 2,416      
Land 823      
Buildings and Improvements 4,042      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (63)      
Land 825      
Buildings and Improvements 3,977      
Total 4,802      
Accumulated Depreciation 12/31/2018 $ 2,003      
801-831 S Great Southwest Pkwy [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Grand Prairie, TX      
Land $ 2,581      
Buildings and Improvements 16,556      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 367      
Land 2,586      
Buildings and Improvements 16,918      
Total 19,504      
Accumulated Depreciation 12/31/2018 $ 11,279      
801 Heinz Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Grand Prairie, TX      
Land $ 599      
Buildings and Improvements 3,327      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 339      
Land 601      
Buildings and Improvements 3,664      
Total 4,265      
Accumulated Depreciation 12/31/2018 $ 1,901      
901-937 Heinz Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Grand Prairie, TX      
Land $ 493      
Buildings and Improvements 2,758      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 56      
Land 481      
Buildings and Improvements 2,826      
Total 3,307      
Accumulated Depreciation 12/31/2018 $ 1,628      
3301 Century Circle [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Irving, TX      
Land $ 760      
Buildings and Improvements 3,856      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (142)      
Land 771      
Buildings and Improvements 3,703      
Total 4,474      
Accumulated Depreciation 12/31/2018 $ 1,260      
3901 W Miller Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Garland, TX      
Land $ 1,912      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 15,135      
Land 1,947      
Buildings and Improvements 15,100      
Total 17,047      
Accumulated Depreciation 12/31/2018 $ 4,926      
1251 North Cockrell Hill Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Dallas, TX      
Land $ 2,064      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 13,553      
Land 1,073      
Buildings and Improvements 14,544      
Total 15,617      
Accumulated Depreciation 12/31/2018 $ 1,625      
1171 North Cockrell Hill Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Dallas, TX      
Land $ 1,215      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 10,972      
Land 632      
Buildings and Improvements 11,555      
Total 12,187      
Accumulated Depreciation 12/31/2018 $ 1,171      
3996 Scientific Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Arlington, TX      
Land $ 1,301      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 8,082      
Land 1,349      
Buildings and Improvements 8,034      
Total 9,383      
Accumulated Depreciation 12/31/2018 $ 1,147      
750 Gateway Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Coppell, TX      
Land $ 1,452      
Buildings and Improvements 4,679      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 80      
Land 1,452      
Buildings and Improvements 4,759      
Total 6,211      
Accumulated Depreciation 12/31/2018 $ 556      
2250 East Bardin Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Arlington, TX      
Land $ 1,603      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 10,465      
Land 1,603      
Buildings and Improvements 10,465      
Total 12,068      
Accumulated Depreciation 12/31/2018 $ 1,041      
4785 Elati [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Denver, CO      
Land $ 173      
Buildings and Improvements 981      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 396      
Land 175      
Buildings and Improvements 1,375      
Total 1,550      
Accumulated Depreciation 12/31/2018 $ 586      
4770 Fox Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Denver, CO      
Land $ 132      
Buildings and Improvements 750      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 321      
Land 134      
Buildings and Improvements 1,069      
Total 1,203      
Accumulated Depreciation 12/31/2018 $ 492      
3851-3871 Revere [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Denver, CO      
Land $ 361      
Buildings and Improvements 2,047      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 483      
Land 368      
Buildings and Improvements 2,523      
Total 2,891      
Accumulated Depreciation 12/31/2018 $ 1,291      
4570 Ivy Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Denver, CO      
Land $ 219      
Buildings and Improvements 1,239      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 111      
Land 220      
Buildings and Improvements 1,349      
Total 1,569      
Accumulated Depreciation 12/31/2018 $ 702      
5855 Stapleton Drive North [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Denver, CO      
Land $ 288      
Buildings and Improvements 1,630      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 183      
Land 290      
Buildings and Improvements 1,811      
Total 2,101      
Accumulated Depreciation 12/31/2018 $ 952      
5885 Stapleton Drive North [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Denver, CO      
Land $ 376      
Buildings and Improvements 2,129      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 327      
Land 380      
Buildings and Improvements 2,452      
Total 2,832      
Accumulated Depreciation 12/31/2018 $ 1,285      
5977 North Broadway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Denver, CO      
Land $ 268      
Buildings and Improvements 1,518      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 518      
Land 271      
Buildings and Improvements 2,033      
Total 2,304      
Accumulated Depreciation 12/31/2018 $ 1,005      
5952-5978 North Broadway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Denver, CO      
Land $ 414      
Buildings and Improvements 2,346      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 704      
Land 422      
Buildings and Improvements 3,042      
Total 3,464      
Accumulated Depreciation 12/31/2018 $ 1,552      
4721 Ironton Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Denver, CO      
Land $ 232      
Buildings and Improvements 1,313      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 352      
Land 236      
Buildings and Improvements 1,661      
Total 1,897      
Accumulated Depreciation 12/31/2018 $ 831      
7003 E 47th Ave Drive [Member ]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Denver, CO      
Land $ 441      
Buildings and Improvements 2,689      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 19      
Land 441      
Buildings and Improvements 2,708      
Total 3,149      
Accumulated Depreciation 12/31/2018 $ 1,472      
9500 West 49th Street - A [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Wheatridge, CO      
Encumbrances $ 992      
Land 283      
Buildings and Improvements 1,625      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 189      
Land 287      
Buildings and Improvements 1,810      
Total 2,097      
Accumulated Depreciation 12/31/2018 $ 947      
9500 West 49th Street - B [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Wheatridge, CO      
Encumbrances $ 822      
Land 225      
Buildings and Improvements 1,272      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 241      
Land 227      
Buildings and Improvements 1,511      
Total 1,738      
Accumulated Depreciation 12/31/2018 $ 739      
9500 West 49th Street - C [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Wheatridge, CO      
Encumbrances $ 2,131      
Land 600      
Buildings and Improvements 3,409      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 498      
Land 601      
Buildings and Improvements 3,906      
Total 4,507      
Accumulated Depreciation 12/31/2018 $ 2,022      
9500 West 49th Street - D [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Wheatridge, CO      
Encumbrances $ 1,029      
Land 246      
Buildings and Improvements 1,537      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 394      
Land 247      
Buildings and Improvements 1,930      
Total 2,177      
Accumulated Depreciation 12/31/2018 $ 1,013      
451-591 East 124th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Thornton, CO      
Land $ 383      
Buildings and Improvements 2,145      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 392      
Land 383      
Buildings and Improvements 2,537      
Total 2,920      
Accumulated Depreciation 12/31/2018 $ 1,371      
6547 South Racine Circle [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Centennial, CO      
Encumbrances $ 2,614      
Land 739      
Buildings and Improvements 4,241      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 486      
Land 739      
Buildings and Improvements 4,727      
Total 5,466      
Accumulated Depreciation 12/31/2018 $ 2,384      
11701 East 53rd Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Denver, CO      
Land $ 416      
Buildings and Improvements 2,355      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 297      
Land 422      
Buildings and Improvements 2,646      
Total 3,068      
Accumulated Depreciation 12/31/2018 $ 1,372      
5401 Oswego [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Denver, CO      
Land $ 273      
Buildings and Improvements 1,547      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 234      
Land 278      
Buildings and Improvements 1,776      
Total 2,054      
Accumulated Depreciation 12/31/2018 $ 942      
445 Bryant Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Denver, CO      
Encumbrances $ 7,511      
Land 1,829      
Buildings and Improvements 10,219      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 2,878      
Land 1,829      
Buildings and Improvements 13,097      
Total 14,926      
Accumulated Depreciation 12/31/2018 $ 6,083      
12055 E 49th Ave/4955 Peoria [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Denver, CO      
Land $ 298      
Buildings and Improvements 1,688      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 505      
Land 305      
Buildings and Improvements 2,186      
Total 2,491      
Accumulated Depreciation 12/31/2018 $ 1,066      
4940 - 4950 Paris [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Denver, CO      
Land $ 152      
Buildings and Improvements 861      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 260      
Land 156      
Buildings and Improvements 1,117      
Total 1,273      
Accumulated Depreciation 12/31/2018 $ 529      
7367 South Revere Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Centennial, CO      
Land $ 926      
Buildings and Improvements 5,124      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,196      
Land 934      
Buildings and Improvements 6,312      
Total 7,246      
Accumulated Depreciation 12/31/2018 $ 3,114      
8200 East Park Meadows Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Lone Tree, CO      
Encumbrances $ 4,955      
Land 1,297      
Buildings and Improvements 7,348      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,202      
Land 1,304      
Buildings and Improvements 8,543      
Total 9,847      
Accumulated Depreciation 12/31/2018 $ 3,682      
3250 Quentin Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Aurora, CO      
Land $ 1,220      
Buildings and Improvements 6,911      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 897      
Land 1,230      
Buildings and Improvements 7,798      
Total 9,028      
Accumulated Depreciation 12/31/2018 $ 3,445      
8020 Southpark Circle [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Littleton, CO      
Land $ 739      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 3,170      
Land 781      
Buildings and Improvements 3,128      
Total 3,909      
Accumulated Depreciation 12/31/2018 $ 1,276      
8810 W. 116th Circle [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Broomfield, CO      
Land $ 312      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,789      
Land 370      
Buildings and Improvements 1,731      
Total 2,101      
Accumulated Depreciation 12/31/2018 $ 718      
8820 W. 116th Circle [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Broomfield, CO      
Land $ 338      
Buildings and Improvements 1,918      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 343      
Land 372      
Buildings and Improvements 2,227      
Total 2,599      
Accumulated Depreciation 12/31/2018 $ 887      
8835 W. 116th Circle [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Broomfield, CO      
Land $ 1,151      
Buildings and Improvements 6,523      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,139      
Land 1,304      
Buildings and Improvements 7,509      
Total 8,813      
Accumulated Depreciation 12/31/2018 $ 3,081      
18150 E. 32nd Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Aurora, CO      
Land $ 563      
Buildings and Improvements 3,188      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 175      
Land 572      
Buildings and Improvements 3,354      
Total 3,926      
Accumulated Depreciation 12/31/2018 $ 1,401      
3400 Fraser Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Aurora, CO      
Encumbrances $ 1,948      
Land 616      
Buildings and Improvements 3,593      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (134)      
Land 620      
Buildings and Improvements 3,455      
Total 4,075      
Accumulated Depreciation 12/31/2018 $ 1,439      
7005 E. 46th Avenue Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Denver, CO      
Encumbrances $ 1,323      
Land 512      
Buildings and Improvements 2,025      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 229      
Land 517      
Buildings and Improvements 2,249      
Total 2,766      
Accumulated Depreciation 12/31/2018 $ 830      
4001 Salazar Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Frederick, CO      
Encumbrances $ 3,340      
Land 1,271      
Buildings and Improvements 6,508      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (713)      
Land 1,276      
Buildings and Improvements 5,790      
Total 7,066      
Accumulated Depreciation 12/31/2018 $ 1,996      
5909-5915 N. Broadway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Denver, CO      
Land $ 495      
Buildings and Improvements 1,268      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 129      
Land 500      
Buildings and Improvements 1,392      
Total 1,892      
Accumulated Depreciation 12/31/2018 $ 856      
21301 E. 33rd Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Aurora, CO      
Encumbrances $ 6,526      
Land 2,860      
Buildings and Improvements 8,202      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 924      
Land 2,859      
Buildings and Improvements 9,127      
Total 11,986      
Accumulated Depreciation 12/31/2018 $ 821      
47461 Clipper [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Plymouth Township, MI      
Land $ 122      
Buildings and Improvements 723      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 159      
Land 122      
Buildings and Improvements 882      
Total 1,004      
Accumulated Depreciation 12/31/2018 $ 498      
449 Executive Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Troy, MI      
Land $ 125      
Buildings and Improvements 425      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 984      
Land 218      
Buildings and Improvements 1,316      
Total 1,534      
Accumulated Depreciation 12/31/2018 $ 1,220      
1416 Meijer Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Troy, MI      
Land $ 94      
Buildings and Improvements 394      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 477      
Land 121      
Buildings and Improvements 844      
Total 965      
Accumulated Depreciation 12/31/2018 $ 725      
1624 Meijer Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Troy, MI      
Land $ 236      
Buildings and Improvements 1,406      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,093      
Land 373      
Buildings and Improvements 2,362      
Total 2,735      
Accumulated Depreciation 12/31/2018 $ 2,241      
1972 Meijer Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Troy, MI      
Land $ 315      
Buildings and Improvements 1,301      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 787      
Land 372      
Buildings and Improvements 2,031      
Total 2,403      
Accumulated Depreciation 12/31/2018 $ 1,859      
1707 Northwood Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Troy, MI      
Land $ 95      
Buildings and Improvements 262      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,409      
Land 239      
Buildings and Improvements 1,527      
Total 1,766      
Accumulated Depreciation 12/31/2018 $ 1,352      
1826 Northwood Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Troy, MI      
Land $ 55      
Buildings and Improvements 208      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 472      
Land 103      
Buildings and Improvements 632      
Total 735      
Accumulated Depreciation 12/31/2018 $ 566      
1864 Northwood Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Troy, MI      
Land $ 57      
Buildings and Improvements 190      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 489      
Land 107      
Buildings and Improvements 629      
Total 736      
Accumulated Depreciation 12/31/2018 $ 580      
2730 Research Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Rochester Hills, MI      
Land $ 903      
Buildings and Improvements 4,215      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 831      
Land 903      
Buildings and Improvements 5,046      
Total 5,949      
Accumulated Depreciation 12/31/2018 $ 4,707      
2791 Research Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Rochester Hills, MI      
Land $ 557      
Buildings and Improvements 2,731      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 687      
Land 560      
Buildings and Improvements 3,415      
Total 3,975      
Accumulated Depreciation 12/31/2018 $ 2,810      
2871 Research Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Rochester Hills, MI      
Land $ 324      
Buildings and Improvements 1,487      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 412      
Land 327      
Buildings and Improvements 1,896      
Total 2,223      
Accumulated Depreciation 12/31/2018 $ 1,610      
2870 Technology Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Rochester Hills, MI      
Land $ 275      
Buildings and Improvements 1,262      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 356      
Land 279      
Buildings and Improvements 1,614      
Total 1,893      
Accumulated Depreciation 12/31/2018 $ 1,488      
2900 Technology Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Rochester Hills, MI      
Land $ 214      
Buildings and Improvements 977      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 723      
Land 219      
Buildings and Improvements 1,695      
Total 1,914      
Accumulated Depreciation 12/31/2018 $ 1,153      
2930 Technology Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Rochester Hills, MI      
Land $ 131      
Buildings and Improvements 594      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 432      
Land 138      
Buildings and Improvements 1,019      
Total 1,157      
Accumulated Depreciation 12/31/2018 $ 802      
2950 Technology Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Rochester Hills, MI      
Land $ 178      
Buildings and Improvements 819      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 368      
Land 185      
Buildings and Improvements 1,180      
Total 1,365      
Accumulated Depreciation 12/31/2018 $ 986      
23014 Commerce Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Farmington Hills, MI      
Land $ 39      
Buildings and Improvements 203      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 189      
Land 56      
Buildings and Improvements 375      
Total 431      
Accumulated Depreciation 12/31/2018 $ 346      
23035 Commerce Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Farmington Hills, MI      
Land $ 71      
Buildings and Improvements 355      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 291      
Land 93      
Buildings and Improvements 624      
Total 717      
Accumulated Depreciation 12/31/2018 $ 544      
23093 Commerce Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Farmington Hills, MI      
Land $ 211      
Buildings and Improvements 1,024      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,337      
Land 295      
Buildings and Improvements 2,277      
Total 2,572      
Accumulated Depreciation 12/31/2018 $ 1,982      
23135 Commerce Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Farmington Hills, MI      
Land $ 146      
Buildings and Improvements 701      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 312      
Land 158      
Buildings and Improvements 1,001      
Total 1,159      
Accumulated Depreciation 12/31/2018 $ 936      
23163 Commerce Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Farmington Hills, MI      
Land $ 111      
Buildings and Improvements 513      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 393      
Land 138      
Buildings and Improvements 879      
Total 1,017      
Accumulated Depreciation 12/31/2018 $ 819      
23177 Commerce Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Farmington Hills, MI      
Land $ 175      
Buildings and Improvements 1,007      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 689      
Land 254      
Buildings and Improvements 1,617      
Total 1,871      
Accumulated Depreciation 12/31/2018 $ 1,496      
4400 Purks Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Auburn Hills, MI      
Land $ 602      
Buildings and Improvements 3,410      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 3,774      
Land 612      
Buildings and Improvements 7,174      
Total 7,786      
Accumulated Depreciation 12/31/2018 $ 3,730      
12707 Eckles Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Plymouth Township, MI      
Land $ 255      
Buildings and Improvements 1,445      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 241      
Land 267      
Buildings and Improvements 1,674      
Total 1,941      
Accumulated Depreciation 12/31/2018 $ 896      
32975 Capitol Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Livonia, MI      
Land $ 135      
Buildings and Improvements 748      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (65)      
Land 77      
Buildings and Improvements 741      
Total 818      
Accumulated Depreciation 12/31/2018 $ 362      
11923 Brookfield Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Livonia, MI      
Land $ 120      
Buildings and Improvements 665      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (306)      
Land 32      
Buildings and Improvements 447      
Total 479      
Accumulated Depreciation 12/31/2018 $ 305      
47711 Clipper Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Plymouth Township, MI      
Land $ 539      
Buildings and Improvements 2,983      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 579      
Land 575      
Buildings and Improvements 3,526      
Total 4,101      
Accumulated Depreciation 12/31/2018 $ 1,733      
12874 Westmore Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Livonia, MI      
Land $ 137      
Buildings and Improvements 761      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (234)      
Land 58      
Buildings and Improvements 606      
Total 664      
Accumulated Depreciation 12/31/2018 $ 369      
1775 Bellingham [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Troy, MI      
Land $ 344      
Buildings and Improvements 1,902      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 439      
Land 367      
Buildings and Improvements 2,318      
Total 2,685      
Accumulated Depreciation 12/31/2018 $ 1,119      
1785 East Maple [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Troy, MI      
Land $ 92      
Buildings and Improvements 507      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 210      
Land 98      
Buildings and Improvements 711      
Total 809      
Accumulated Depreciation 12/31/2018 $ 341      
980 Chicago [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Troy, MI      
Land $ 206      
Buildings and Improvements 1,141      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 333      
Land 220      
Buildings and Improvements 1,460      
Total 1,680      
Accumulated Depreciation 12/31/2018 $ 706      
1885 Enterprise Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Rochester Hills, MI      
Land $ 209      
Buildings and Improvements 1,158      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 589      
Land 223      
Buildings and Improvements 1,733      
Total 1,956      
Accumulated Depreciation 12/31/2018 $ 945      
1935-55 Enterprise Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Rochester Hills, MI      
Land $ 1,285      
Buildings and Improvements 7,144      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,342      
Land 1,371      
Buildings and Improvements 8,400      
Total 9,771      
Accumulated Depreciation 12/31/2018 $ 4,244      
5500 Enterprise Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Warren, MI      
Land $ 675      
Buildings and Improvements 3,737      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 772      
Land 721      
Buildings and Improvements 4,463      
Total 5,184      
Accumulated Depreciation 12/31/2018 $ 2,227      
750 Chicago Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Troy, MI      
Land $ 323      
Buildings and Improvements 1,790      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 404      
Land 345      
Buildings and Improvements 2,172      
Total 2,517      
Accumulated Depreciation 12/31/2018 $ 1,107      
800 Chicago Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Troy, MI      
Land $ 283      
Buildings and Improvements 1,567      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 380      
Land 302      
Buildings and Improvements 1,928      
Total 2,230      
Accumulated Depreciation 12/31/2018 $ 963      
850 Chicago Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Troy, MI      
Land $ 183      
Buildings and Improvements 1,016      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 279      
Land 196      
Buildings and Improvements 1,282      
Total 1,478      
Accumulated Depreciation 12/31/2018 $ 623      
4872 S. Lapeer Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Lake Orion Twsp, MI      
Land $ 1,342      
Buildings and Improvements 5,441      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 481      
Land 1,412      
Buildings and Improvements 5,852      
Total 7,264      
Accumulated Depreciation 12/31/2018 $ 2,884      
1400 Allen Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Troy, MI      
Land $ 209      
Buildings and Improvements 1,154      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 393      
Land 212      
Buildings and Improvements 1,544      
Total 1,756      
Accumulated Depreciation 12/31/2018 $ 658      
1408 Allen Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Troy, MI      
Land $ 151      
Buildings and Improvements 834      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 104      
Land 153      
Buildings and Improvements 936      
Total 1,089      
Accumulated Depreciation 12/31/2018 $ 416      
28435 Automation Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Wixom, MI      
Land $ 621      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 3,661      
Land 628      
Buildings and Improvements 3,654      
Total 4,282      
Accumulated Depreciation 12/31/2018 $ 1,284      
32200 N Avis Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Madison Heights, MI      
Land $ 503      
Buildings and Improvements 3,367      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (921)      
Land 195      
Buildings and Improvements 2,754      
Total 2,949      
Accumulated Depreciation 12/31/2018 $ 917      
100 Kay Industrial Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Orion Township, MI      
Land $ 677      
Buildings and Improvements 2,018      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 175      
Land 685      
Buildings and Improvements 2,185      
Total 2,870      
Accumulated Depreciation 12/31/2018 $ 1,263      
42555 Merrill Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Sterling Heights, MI      
Land $ 1,080      
Buildings and Improvements 2,300      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 3,415      
Land 1,090      
Buildings and Improvements 5,705      
Total 6,795      
Accumulated Depreciation 12/31/2018 $ 2,842      
200 Northpointe Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Orion Township, MI      
Land $ 723      
Buildings and Improvements 2,063      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (456)      
Land 734      
Buildings and Improvements 1,596      
Total 2,330      
Accumulated Depreciation 12/31/2018 $ 748      
3351 Rauch St [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Houston, TX      
Land $ 272      
Buildings and Improvements 1,541      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 641      
Land 278      
Buildings and Improvements 2,176      
Total 2,454      
Accumulated Depreciation 12/31/2018 $ 1,019      
3801-3851 Yale St [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Houston, TX      
Land $ 413      
Buildings and Improvements 2,343      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,499      
Land 425      
Buildings and Improvements 3,830      
Total 4,255      
Accumulated Depreciation 12/31/2018 $ 1,603      
3337-3347 Rauch Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Houston, TX      
Land $ 227      
Buildings and Improvements 1,287      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 444      
Land 233      
Buildings and Improvements 1,725      
Total 1,958      
Accumulated Depreciation 12/31/2018 $ 813      
8505 N Loop East [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Houston, TX      
Land $ 439      
Buildings and Improvements 2,489      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 613      
Land 449      
Buildings and Improvements 3,092      
Total 3,541      
Accumulated Depreciation 12/31/2018 $ 1,535      
4749-4799 Eastpark Dr [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Houston, TX      
Land $ 594      
Buildings and Improvements 3,368      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,220      
Land 611      
Buildings and Improvements 4,571      
Total 5,182      
Accumulated Depreciation 12/31/2018 $ 2,317      
4851 Homestead Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Houston, TX      
Encumbrances $ 2,198      
Land 491      
Buildings and Improvements 2,782      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,377      
Land 504      
Buildings and Improvements 4,146      
Total 4,650      
Accumulated Depreciation 12/31/2018 $ 2,055      
3365-3385 Rauch Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Houston, TX      
Land $ 284      
Buildings and Improvements 1,611      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 486      
Land 290      
Buildings and Improvements 2,091      
Total 2,381      
Accumulated Depreciation 12/31/2018 $ 999      
5050 Campbell Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Houston, TX      
Land $ 461      
Buildings and Improvements 2,610      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,078      
Land 470      
Buildings and Improvements 3,679      
Total 4,149      
Accumulated Depreciation 12/31/2018 $ 1,790      
4300 Pine Timbers [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Houston, TX      
Encumbrances $ 2,235      
Land 489      
Buildings and Improvements 2,769      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,183      
Land 499      
Buildings and Improvements 3,942      
Total 4,441      
Accumulated Depreciation 12/31/2018 $ 1,844      
2500-2530 Fairway Park Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Houston, TX      
Land $ 766      
Buildings and Improvements 4,342      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 2,200      
Land 792      
Buildings and Improvements 6,516      
Total 7,308      
Accumulated Depreciation 12/31/2018 $ 2,866      
6550 Longpointe [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Houston, TX      
Land $ 362      
Buildings and Improvements 2,050      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 924      
Land 370      
Buildings and Improvements 2,966      
Total 3,336      
Accumulated Depreciation 12/31/2018 $ 1,399      
1815 Turning Basin Dr [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Houston, TX      
Land $ 487      
Buildings and Improvements 2,761      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 2,105      
Land 531      
Buildings and Improvements 4,822      
Total 5,353      
Accumulated Depreciation 12/31/2018 $ 2,106      
1819 Turning Basin Dr [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Houston, TX      
Land $ 231      
Buildings and Improvements 1,308      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 899      
Land 251      
Buildings and Improvements 2,187      
Total 2,438      
Accumulated Depreciation 12/31/2018 $ 1,007      
1805 Turning Basin Dr [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Houston, TX      
Land $ 564      
Buildings and Improvements 3,197      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 2,699      
Land 616      
Buildings and Improvements 5,844      
Total 6,460      
Accumulated Depreciation 12/31/2018 $ 2,698      
11505 State Highway 225 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) La Porte, TX      
Land $ 940      
Buildings and Improvements 4,675      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 10      
Land 940      
Buildings and Improvements 4,685      
Total 5,625      
Accumulated Depreciation 12/31/2018 $ 1,785      
1500 E. Main Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) La Porte, TX      
Land $ 201      
Buildings and Improvements 1,328      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (91)      
Land 204      
Buildings and Improvements 1,234      
Total 1,438      
Accumulated Depreciation 12/31/2018 $ 1,147      
7230-7238 Wynnwood [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Houston, TX      
Land $ 254      
Buildings and Improvements 764      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 249      
Land 259      
Buildings and Improvements 1,008      
Total 1,267      
Accumulated Depreciation 12/31/2018 $ 602      
7240-7248 Wynnwood [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Houston, TX      
Land $ 271      
Buildings and Improvements 726      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 333      
Land 276      
Buildings and Improvements 1,054      
Total 1,330      
Accumulated Depreciation 12/31/2018 $ 556      
7250-7260 Wynnwood [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Houston, TX      
Land $ 200      
Buildings and Improvements 481      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,501      
Land 203      
Buildings and Improvements 1,979      
Total 2,182      
Accumulated Depreciation 12/31/2018 $ 690      
6400 Long Point [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Houston, TX      
Land $ 188      
Buildings and Improvements 898      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 132      
Land 188      
Buildings and Improvements 1,030      
Total 1,218      
Accumulated Depreciation 12/31/2018 $ 475      
7967 Blankenship [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Houston, TX      
Land $ 307      
Buildings and Improvements 1,166      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 374      
Land 307      
Buildings and Improvements 1,540      
Total 1,847      
Accumulated Depreciation 12/31/2018 $ 676      
8800 City Park Look East [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Houston, TX      
Land $ 3,717      
Buildings and Improvements 19,237      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (535)      
Land 3,717      
Buildings and Improvements 18,702      
Total 22,419      
Accumulated Depreciation 12/31/2018 $ 5,561      
4800 West Greens Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Houston, TX      
Land $ 3,350      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 16,757      
Land 3,312      
Buildings and Improvements 16,795      
Total 20,107      
Accumulated Depreciation 12/31/2018 $ 2,497      
611 East Sam Houston Parkway S [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Pasadena, TX      
Land $ 1,970      
Buildings and Improvements 7,431      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,313      
Land 2,013      
Buildings and Improvements 8,701      
Total 10,714      
Accumulated Depreciation 12/31/2018 $ 824      
619 East Sam Houston Parkway S [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Pasadena, TX      
Land $ 2,879      
Buildings and Improvements 11,713      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 778      
Land 2,876      
Buildings and Improvements 12,494      
Total 15,370      
Accumulated Depreciation 12/31/2018 $ 1,203      
6913 Guhn Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Houston, TX      
Land $ 1,367      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 6,301      
Land 1,367      
Buildings and Improvements 6,301      
Total 7,668      
Accumulated Depreciation 12/31/2018 $ 0      
607 East Sam Houston Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Pasedena, TX      
Land $ 2,076      
Buildings and Improvements 11,674      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 0      
Land 2,076      
Buildings and Improvements 11,674      
Total 13,750      
Accumulated Depreciation 12/31/2018 $ 2      
615 East Sam Houston Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Pasedena, TX      
Land $ 4,265      
Buildings and Improvements 11,983      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 0      
Land 4,265      
Buildings and Improvements 11,983      
Total 16,248      
Accumulated Depreciation 12/31/2018 $ 0      
2900 N Shadeland Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Indianapolis, IN      
Land $ 2,057      
Buildings and Improvements 13,565      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 7,351      
Land 2,057      
Buildings and Improvements 20,916      
Total 22,973      
Accumulated Depreciation 12/31/2018 $ 10,005      
1445 Brookville Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Indianapolis, IN      
Land $ 459      
Buildings and Improvements 2,603      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,421      
Land 476      
Buildings and Improvements 4,007      
Total 4,483      
Accumulated Depreciation 12/31/2018 $ 1,978      
1440 Brookville Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Indianapolis, IN      
Land $ 665      
Buildings and Improvements 3,770      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 956      
Land 685      
Buildings and Improvements 4,706      
Total 5,391      
Accumulated Depreciation 12/31/2018 $ 2,454      
1240 Brookville Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Indianapolis, IN      
Land $ 247      
Buildings and Improvements 1,402      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 465      
Land 258      
Buildings and Improvements 1,856      
Total 2,114      
Accumulated Depreciation 12/31/2018 $ 952      
1345 Brookville Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Indianapolis, IN      
Land $ 586      
Buildings and Improvements 3,321      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,718      
Land 601      
Buildings and Improvements 5,024      
Total 5,625      
Accumulated Depreciation 12/31/2018 $ 2,584      
1350 Brookville Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Indianapolis, IN      
Land $ 205      
Buildings and Improvements 1,161      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 513      
Land 212      
Buildings and Improvements 1,667      
Total 1,879      
Accumulated Depreciation 12/31/2018 $ 791      
1335 Sadlier Circle East [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Indianapolis, IN      
Land $ 81      
Buildings and Improvements 460      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 244      
Land 86      
Buildings and Improvements 699      
Total 785      
Accumulated Depreciation 12/31/2018 $ 341      
6951 East 30th St [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Indianapolis, IN      
Land $ 256      
Buildings and Improvements 1,449      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 507      
Land 265      
Buildings and Improvements 1,947      
Total 2,212      
Accumulated Depreciation 12/31/2018 $ 962      
6701 East 30th St [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Indianapolis, IN      
Land $ 78      
Buildings and Improvements 443      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 98      
Land 82      
Buildings and Improvements 537      
Total 619      
Accumulated Depreciation 12/31/2018 $ 301      
6737 East 30th St [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Indianapolis, IN      
Land $ 385      
Buildings and Improvements 2,181      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 669      
Land 398      
Buildings and Improvements 2,837      
Total 3,235      
Accumulated Depreciation 12/31/2018 $ 1,455      
6555 East 30th St [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Indianapolis, IN      
Land $ 484      
Buildings and Improvements 4,760      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 2,699      
Land 484      
Buildings and Improvements 7,459      
Total 7,943      
Accumulated Depreciation 12/31/2018 $ 3,530      
7901 West 21st St. [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Indianapolis, IN      
Land $ 1,048      
Buildings and Improvements 6,027      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 426      
Land 1,048      
Buildings and Improvements 6,453      
Total 7,501      
Accumulated Depreciation 12/31/2018 $ 3,358      
1225 Brookville Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Indianapolis, IN      
Land $ 60      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 432      
Land 68      
Buildings and Improvements 424      
Total 492      
Accumulated Depreciation 12/31/2018 $ 218      
6751 E 30th St [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Indianapolis, IN      
Land $ 728      
Buildings and Improvements 2,837      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 457      
Land 741      
Buildings and Improvements 3,281      
Total 4,022      
Accumulated Depreciation 12/31/2018 $ 1,716      
6575 East 30th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Indianapolis, IN      
Land $ 118      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 2,160      
Land 128      
Buildings and Improvements 2,150      
Total 2,278      
Accumulated Depreciation 12/31/2018 $ 980      
6585 East 30th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Indianapolis, IN      
Land $ 196      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 3,223      
Land 196      
Buildings and Improvements 3,223      
Total 3,419      
Accumulated Depreciation 12/31/2018 $ 1,618      
14425 Bergen Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Noblesville, IN      
Land $ 647      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 3,595      
Land 743      
Buildings and Improvements 3,499      
Total 4,242      
Accumulated Depreciation 12/31/2018 $ 1,094      
6635 E 30th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Indianapolis, IN      
Land $ 466      
Buildings and Improvements 3,093      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 82      
Land 466      
Buildings and Improvements 3,175      
Total 3,641      
Accumulated Depreciation 12/31/2018 $ 352      
4700 NW 15th Ave [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Ft. Lauderdale, FL      
Land $ 908      
Buildings and Improvements 1,883      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 207      
Land 912      
Buildings and Improvements 2,086      
Total 2,998      
Accumulated Depreciation 12/31/2018 $ 823      
4710 NW 15th Ave [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Ft. Lauderdale, FL      
Land $ 830      
Buildings and Improvements 2,722      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 27      
Land 834      
Buildings and Improvements 2,745      
Total 3,579      
Accumulated Depreciation 12/31/2018 $ 910      
4720 NW 15th Ave [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Ft. Lauderdale, FL      
Land $ 937      
Buildings and Improvements 2,455      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 255      
Land 942      
Buildings and Improvements 2,705      
Total 3,647      
Accumulated Depreciation 12/31/2018 $ 999      
4740 NW 15th Ave [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Ft. Lauderdale, FL      
Land $ 1,107      
Buildings and Improvements 3,111      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 50      
Land 1,112      
Buildings and Improvements 3,156      
Total 4,268      
Accumulated Depreciation 12/31/2018 $ 1,064      
4750 NW 15th Ave [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Ft. Lauderdale, FL      
Land $ 947      
Buildings and Improvements 3,079      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 359      
Land 951      
Buildings and Improvements 3,434      
Total 4,385      
Accumulated Depreciation 12/31/2018 $ 1,108      
4800 NW 15th Ave [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Ft. Lauderdale, FL      
Land $ 1,092      
Buildings and Improvements 3,308      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 60      
Land 1,097      
Buildings and Improvements 3,363      
Total 4,460      
Accumulated Depreciation 12/31/2018 $ 1,046      
6891 NW 74th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Medley, FL      
Land $ 857      
Buildings and Improvements 3,428      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 3,874      
Land 864      
Buildings and Improvements 7,295      
Total 8,159      
Accumulated Depreciation 12/31/2018 $ 2,729      
12601 &12605 NW 115th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Medley, FL      
Land $ 2,039      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 344      
Land 674      
Buildings and Improvements 1,709      
Total 2,383      
Accumulated Depreciation 12/31/2018 $ 421      
1351 NW 78th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Doral, FL      
Land $ 3,111      
Buildings and Improvements 4,634      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 10      
Land 3,111      
Buildings and Improvements 4,644      
Total 7,755      
Accumulated Depreciation 12/31/2018 $ 512      
2500 N.W. 19th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Pompano Beach, FL      
Land $ 8,824      
Buildings and Improvements 11,660      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 229      
Land 8,824      
Buildings and Improvements 11,889      
Total 20,713      
Accumulated Depreciation 12/31/2018 $ 939      
5355 South Westridge Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) New Berlin, WI      
Encumbrances $ 4,135      
Land 1,630      
Buildings and Improvements 7,058      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (39)      
Land 1,646      
Buildings and Improvements 7,003      
Total 8,649      
Accumulated Depreciation 12/31/2018 $ 2,293      
17005 W. Ryerson Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) New Berlin, WI      
Encumbrances $ 2,247      
Land 403      
Buildings and Improvements 3,647      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 415      
Land 405      
Buildings and Improvements 4,060      
Total 4,465      
Accumulated Depreciation 12/31/2018 $ 2,383      
1500 Peebles Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Richland Center, WI      
Land $ 1,577      
Buildings and Improvements 1,018      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (441)      
Land 1,528      
Buildings and Improvements 626      
Total 2,154      
Accumulated Depreciation 12/31/2018 $ 567      
16600 West Glendale Ave [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) New Berlin, WI      
Encumbrances $ 1,577      
Land 704      
Buildings and Improvements 1,923      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 710      
Land 715      
Buildings and Improvements 2,622      
Total 3,337      
Accumulated Depreciation 12/31/2018 $ 2,031      
N58W15380 Shawn Circle [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Menomonee Falls, WI      
Land $ 1,188      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 17,020      
Land 1,204      
Buildings and Improvements 17,004      
Total 18,208      
Accumulated Depreciation 12/31/2018 $ 5,186      
6201 West 111th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Bloomington, MN      
Encumbrances $ 1,645      
Land 1,358      
Buildings and Improvements 8,622      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 13,263      
Land 1,519      
Buildings and Improvements 21,724      
Total 23,243      
Accumulated Depreciation 12/31/2018 $ 13,901      
1030 Lone Oak Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Eagan, MN      
Encumbrances $ 1,877      
Land 456      
Buildings and Improvements 2,703      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 813      
Land 456      
Buildings and Improvements 3,516      
Total 3,972      
Accumulated Depreciation 12/31/2018 $ 2,025      
1060 Lone Oak Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Eagan, MN      
Encumbrances $ 2,438      
Land 624      
Buildings and Improvements 3,700      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 834      
Land 624      
Buildings and Improvements 4,534      
Total 5,158      
Accumulated Depreciation 12/31/2018 $ 2,608      
5400 Nathan Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Plymouth, MN      
Land $ 749      
Buildings and Improvements 4,461      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 869      
Land 757      
Buildings and Improvements 5,322      
Total 6,079      
Accumulated Depreciation 12/31/2018 $ 3,038      
6655 Wedgewood Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Maple Grove, MN      
Land $ 1,466      
Buildings and Improvements 8,342      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 6,232      
Land 1,466      
Buildings and Improvements 14,574      
Total 16,040      
Accumulated Depreciation 12/31/2018 $ 7,621      
10120 W 76th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Eden Prairie, MN      
Land $ 315      
Buildings and Improvements 1,804      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,043      
Land 315      
Buildings and Improvements 2,847      
Total 3,162      
Accumulated Depreciation 12/31/2018 $ 1,554      
12155 Nicollet Ave. [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Burnsville, MN      
Land $ 286      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,957      
Land 288      
Buildings and Improvements 1,955      
Total 2,243      
Accumulated Depreciation 12/31/2018 $ 1,037      
5775 12th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Shakopee, MN      
Encumbrances $ 3,251      
Land 590      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 5,871      
Land 590      
Buildings and Improvements 5,871      
Total 6,461      
Accumulated Depreciation 12/31/2018 $ 2,176      
1157 Valley Park Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Shakopee, MN      
Encumbrances $ 4,061      
Land 760      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 7,734      
Land 888      
Buildings and Improvements 7,606      
Total 8,494      
Accumulated Depreciation 12/31/2018 $ 3,203      
9600 West 76th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Eden Prairie, MN      
Encumbrances $ 1,918      
Land 1,000      
Buildings and Improvements 2,450      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 67      
Land 1,034      
Buildings and Improvements 2,483      
Total 3,517      
Accumulated Depreciation 12/31/2018 $ 893      
9700 West 76th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Eden Prairie, MN      
Encumbrances $ 2,223      
Land 1,000      
Buildings and Improvements 2,709      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 368      
Land 1,038      
Buildings and Improvements 3,039      
Total 4,077      
Accumulated Depreciation 12/31/2018 $ 995      
7600 69th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Greenfield, MN      
Land $ 1,500      
Buildings and Improvements 8,328      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (468)      
Land 1,510      
Buildings and Improvements 7,850      
Total 9,360      
Accumulated Depreciation 12/31/2018 $ 2,322      
5017 Boone Avenue North [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) New Hope, MN      
Land $ 1,000      
Buildings and Improvements 1,599      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 600      
Land 1,009      
Buildings and Improvements 2,190      
Total 3,199      
Accumulated Depreciation 12/31/2018 $ 1,400      
1087 Park Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Shakopee, MN      
Encumbrances $ 2,939      
Land 1,195      
Buildings and Improvements 4,891      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (246)      
Land 1,198      
Buildings and Improvements 4,642      
Total 5,840      
Accumulated Depreciation 12/31/2018 $ 1,646      
5391 12th Avenue SE [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Shakopee, MN      
Land $ 1,392      
Buildings and Improvements 8,149      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 13      
Land 1,395      
Buildings and Improvements 8,159      
Total 9,554      
Accumulated Depreciation 12/31/2018 $ 2,660      
4701 Valley Industrial Blvd S [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Shakopee, MN      
Encumbrances $ 4,167      
Land 1,296      
Buildings and Improvements 7,157      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (172)      
Land 1,299      
Buildings and Improvements 6,982      
Total 8,281      
Accumulated Depreciation 12/31/2018 $ 3,733      
6455 City West Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Eden Prairie, MN      
Land $ 659      
Buildings and Improvements 3,189      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,273      
Land 665      
Buildings and Improvements 4,456      
Total 5,121      
Accumulated Depreciation 12/31/2018 $ 2,102      
7035 Winnetka Avene North [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Brooklyn Park, MN      
Encumbrances $ 4,218      
Land 1,275      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 7,545      
Land 1,343      
Buildings and Improvements 7,477      
Total 8,820      
Accumulated Depreciation 12/31/2018 $ 2,305      
139 Eva Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) St. Paul, MN      
Land $ 2,132      
Buildings and Improvements 3,105      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (286)      
Land 2,175      
Buildings and Improvements 2,776      
Total 4,951      
Accumulated Depreciation 12/31/2018 $ 914      
21900 Dodd Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Lakeville, MN      
Land $ 2,289      
Buildings and Improvements 7,952      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 0      
Land 2,289      
Buildings and Improvements 7,952      
Total 10,241      
Accumulated Depreciation 12/31/2018 $ 3,062      
375 Rivertown Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Woodbury, MN      
Encumbrances $ 6,993      
Land 2,635      
Buildings and Improvements 8,157      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,224      
Land 2,635      
Buildings and Improvements 9,381      
Total 12,016      
Accumulated Depreciation 12/31/2018 $ 2,184      
935 Aldrin Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Eagan, MN      
Encumbrances $ 5,188      
Land 2,096      
Buildings and Improvements 7,884      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 439      
Land 2,096      
Buildings and Improvements 8,323      
Total 10,419      
Accumulated Depreciation 12/31/2018 $ 1,652      
7050 Winnetka Avenue North [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Brooklyn Park, MN      
Land $ 1,623      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 7,567      
Land 1,634      
Buildings and Improvements 7,556      
Total 9,190      
Accumulated Depreciation 12/31/2018 $ 818      
7051 West Broadway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Brooklyn Park, MN      
Encumbrances $ 3,358      
Land 1,275      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 5,828      
Land 1,279      
Buildings and Improvements 5,824      
Total 7,103      
Accumulated Depreciation 12/31/2018 $ 592      
1931 Air Lane Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Nashville, TN      
Land $ 489      
Buildings and Improvements 2,785      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 635      
Land 493      
Buildings and Improvements 3,416      
Total 3,909      
Accumulated Depreciation 12/31/2018 $ 1,649      
4640 Cummings Park [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Nashville, TN      
Land $ 360      
Buildings and Improvements 2,040      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 689      
Land 365      
Buildings and Improvements 2,724      
Total 3,089      
Accumulated Depreciation 12/31/2018 $ 1,197      
1740 River Hills Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Nashville, TN      
Encumbrances $ 2,537      
Land 848      
Buildings and Improvements 4,383      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 652      
Land 888      
Buildings and Improvements 4,995      
Total 5,883      
Accumulated Depreciation 12/31/2018 $ 2,669      
211 Ellery Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Nashville, TN      
Encumbrances $ 1,658      
Land 606      
Buildings and Improvements 3,192      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (289)      
Land 616      
Buildings and Improvements 2,893      
Total 3,509      
Accumulated Depreciation 12/31/2018 $ 1,052      
130 Maddox Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Mount Juliet, TN      
Land $ 1,778      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 23,914      
Land 1,778      
Buildings and Improvements 23,914      
Total 25,692      
Accumulated Depreciation 12/31/2018 $ 5,963      
14 World's Fair Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Franklin, NJ      
Land $ 483      
Buildings and Improvements 2,735      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 858      
Land 503      
Buildings and Improvements 3,573      
Total 4,076      
Accumulated Depreciation 12/31/2018 $ 1,682      
12 World's Fair Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Franklin, NJ      
Land $ 572      
Buildings and Improvements 3,240      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 838      
Land 593      
Buildings and Improvements 4,057      
Total 4,650      
Accumulated Depreciation 12/31/2018 $ 2,032      
22 World's Fair Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Franklin, NJ      
Land $ 364      
Buildings and Improvements 2,064      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 582      
Land 375      
Buildings and Improvements 2,635      
Total 3,010      
Accumulated Depreciation 12/31/2018 $ 1,270      
26 World's Fair Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Franklin, NJ      
Land $ 361      
Buildings and Improvements 2,048      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 606      
Land 377      
Buildings and Improvements 2,638      
Total 3,015      
Accumulated Depreciation 12/31/2018 $ 1,314      
24 World's Fair Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Franklin, NJ      
Land $ 347      
Buildings and Improvements 1,968      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 530      
Land 362      
Buildings and Improvements 2,483      
Total 2,845      
Accumulated Depreciation 12/31/2018 $ 1,252      
20 World's Fair Drive Lot 13 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Somerset, NJ      
Land $ 9      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 2,630      
Land 691      
Buildings and Improvements 1,948      
Total 2,639      
Accumulated Depreciation 12/31/2018 $ 847      
45 Route 46 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Pine Brook, NJ      
Land $ 969      
Buildings and Improvements 5,491      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,032      
Land 978      
Buildings and Improvements 6,514      
Total 7,492      
Accumulated Depreciation 12/31/2018 $ 2,799      
43 Route 46 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Pine Brook, NJ      
Land $ 474      
Buildings and Improvements 2,686      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 472      
Land 479      
Buildings and Improvements 3,153      
Total 3,632      
Accumulated Depreciation 12/31/2018 $ 1,409      
39 Route 46 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Pine Brook, NJ      
Land $ 260      
Buildings and Improvements 1,471      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 256      
Land 262      
Buildings and Improvements 1,725      
Total 1,987      
Accumulated Depreciation 12/31/2018 $ 765      
26 Chapin Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Pine Brook, NJ      
Land $ 956      
Buildings and Improvements 5,415      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 519      
Land 965      
Buildings and Improvements 5,925      
Total 6,890      
Accumulated Depreciation 12/31/2018 $ 2,635      
30 Chapin Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Pine Brook, NJ      
Land $ 960      
Buildings and Improvements 5,440      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 514      
Land 970      
Buildings and Improvements 5,944      
Total 6,914      
Accumulated Depreciation 12/31/2018 $ 2,638      
20 Hook Mountain Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Pine Brook, NJ      
Land $ 1,507      
Buildings and Improvements 8,542      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,401      
Land 1,534      
Buildings and Improvements 9,916      
Total 11,450      
Accumulated Depreciation 12/31/2018 $ 4,442      
30 Hook Mountain Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Pine Brook, NJ      
Land $ 389      
Buildings and Improvements 2,206      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 317      
Land 396      
Buildings and Improvements 2,516      
Total 2,912      
Accumulated Depreciation 12/31/2018 $ 1,113      
16 Chapin Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Pine Brook, NJ      
Land $ 885      
Buildings and Improvements 5,015      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 659      
Land 901      
Buildings and Improvements 5,658      
Total 6,559      
Accumulated Depreciation 12/31/2018 $ 2,491      
20 Chapin Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Pine Brook, NJ      
Land $ 1,134      
Buildings and Improvements 6,426      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 692      
Land 1,154      
Buildings and Improvements 7,098      
Total 8,252      
Accumulated Depreciation 12/31/2018 $ 3,106      
2500 Main Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Sayreville, NJ      
Land $ 944      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 4,475      
Land 944      
Buildings and Improvements 4,475      
Total 5,419      
Accumulated Depreciation 12/31/2018 $ 1,768      
2400 Main Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Sayreville, NJ      
Land $ 996      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 5,435      
Land 996      
Buildings and Improvements 5,435      
Total 6,431      
Accumulated Depreciation 12/31/2018 $ 1,940      
7851 Airport Highway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Pennsauken, NJ      
Land $ 160      
Buildings and Improvements 508      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 328      
Land 162      
Buildings and Improvements 834      
Total 996      
Accumulated Depreciation 12/31/2018 $ 429      
309-319 Pierce Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Somerset, NJ      
Encumbrances $ 2,818      
Land 1,300      
Buildings and Improvements 4,628      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 606      
Land 1,309      
Buildings and Improvements 5,225      
Total 6,534      
Accumulated Depreciation 12/31/2018 $ 2,005      
400 Cedar Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Florence Township, NJ      
Land $ 9,730      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 26,209      
Land 9,730      
Buildings and Improvements 26,209      
Total 35,939      
Accumulated Depreciation 12/31/2018 $ 1,486      
301 Bordentown Hedding Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Bordentown, NJ      
Land $ 3,983      
Buildings and Improvements 15,881      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 9      
Land 3,984      
Buildings and Improvements 15,889      
Total 19,873      
Accumulated Depreciation 12/31/2018 $ 806      
302 Bordentown Hedding Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Bordentown, NJ      
Land $ 2,738      
Buildings and Improvements 8,190      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 0      
Land 2,738      
Buildings and Improvements 8,190      
Total 10,928      
Accumulated Depreciation 12/31/2018 $ 89      
6301 Hazeltine National Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Orlando, FL      
Land $ 909      
Buildings and Improvements 4,613      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 237      
Land 920      
Buildings and Improvements 4,839      
Total 5,759      
Accumulated Depreciation 12/31/2018 $ 1,803      
8751 Skinner Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Orlando, FL      
Encumbrances $ 4,243      
Land 1,691      
Buildings and Improvements 7,249      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (5)      
Land 1,692      
Buildings and Improvements 7,243      
Total 8,935      
Accumulated Depreciation 12/31/2018 $ 694      
4473 Shader Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Orlando, FL      
Land $ 2,094      
Buildings and Improvements 10,444      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 56      
Land 2,094      
Buildings and Improvements 10,500      
Total 12,594      
Accumulated Depreciation 12/31/2018 $ 924      
550 Gills Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Orlando, FL      
Land $ 1,321      
Buildings and Improvements 6,176      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 4      
Land 1,321      
Buildings and Improvements 6,180      
Total 7,501      
Accumulated Depreciation 12/31/2018 $ 311      
450 Gills Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Orlando, FL      
Land $ 1,031      
Buildings and Improvements 6,406      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 0      
Land 1,031      
Buildings and Improvements 6,406      
Total 7,437      
Accumulated Depreciation 12/31/2018 $ 231      
4401 Shader Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Orlando, FL      
Land $ 1,037      
Buildings and Improvements 7,116      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 4      
Land 1,037      
Buildings and Improvements 7,120      
Total 8,157      
Accumulated Depreciation 12/31/2018 $ 158      
1045 South Edward Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Tempe, AZ      
Land $ 390      
Buildings and Improvements 2,160      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 627      
Land 396      
Buildings and Improvements 2,781      
Total 3,177      
Accumulated Depreciation 12/31/2018 $ 1,248      
50 South 56th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Chandler, AZ      
Land $ 1,206      
Buildings and Improvements 3,218      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,379      
Land 1,252      
Buildings and Improvements 4,551      
Total 5,803      
Accumulated Depreciation 12/31/2018 $ 2,112      
245 W. Lodge [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Tempe, AZ      
Land $ 898      
Buildings and Improvements 3,066      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (2,153)      
Land 362      
Buildings and Improvements 1,449      
Total 1,811      
Accumulated Depreciation 12/31/2018 $ 536      
1590 E Riverview Dr. [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Phoenix, AZ      
Land $ 1,293      
Buildings and Improvements 5,950      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (267)      
Land 1,292      
Buildings and Improvements 5,684      
Total 6,976      
Accumulated Depreciation 12/31/2018 $ 1,478      
14131 N. Rio Vista Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Peoria, AZ      
Encumbrances $ 5,439      
Land 2,563      
Buildings and Improvements 9,388      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (445)      
Land 2,563      
Buildings and Improvements 8,943      
Total 11,506      
Accumulated Depreciation 12/31/2018 $ 2,206      
8716 W. Ludlow Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Peoria, AZ      
Encumbrances $ 6,721      
Land 2,709      
Buildings and Improvements 10,970      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 540      
Land 2,709      
Buildings and Improvements 11,510      
Total 14,219      
Accumulated Depreciation 12/31/2018 $ 2,942      
3815 W. Washington St. [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Phoenix, AZ      
Land $ 1,675      
Buildings and Improvements 4,514      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 316      
Land 1,719      
Buildings and Improvements 4,786      
Total 6,505      
Accumulated Depreciation 12/31/2018 $ 1,489      
9180 W. Buckeye Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Tolleson, AZ      
Land $ 1,904      
Buildings and Improvements 6,805      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 3,124      
Land 1,923      
Buildings and Improvements 9,910      
Total 11,833      
Accumulated Depreciation 12/31/2018 $ 2,890      
8644 West Ludlow Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Peoria, AZ      
Land $ 1,726      
Buildings and Improvements 7,216      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 0      
Land 1,726      
Buildings and Improvements 7,216      
Total 8,942      
Accumulated Depreciation 12/31/2018 $ 1,072      
8606 West Ludlow Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Peoria, AZ      
Land $ 956      
Buildings and Improvements 2,668      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 123      
Land 956      
Buildings and Improvements 2,791      
Total 3,747      
Accumulated Depreciation 12/31/2018 $ 433      
8679 West Ludlow Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Peoria, AZ      
Land $ 672      
Buildings and Improvements 2,791      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 0      
Land 672      
Buildings and Improvements 2,791      
Total 3,463      
Accumulated Depreciation 12/31/2018 $ 423      
94th Avenue and Buckeye Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Tolleson, AZ      
Land $ 4,315      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 16,645      
Land 4,315      
Buildings and Improvements 16,645      
Total 20,960      
Accumulated Depreciation 12/31/2018 $ 1,306      
16601 West Sells Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Goodyear, AZ      
Land $ 24,743      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 19,087      
Land 24,803      
Buildings and Improvements 19,027      
Total 43,830      
Accumulated Depreciation 12/31/2018 $ 873      
16560 West Sells Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Goodyear, AZ      
Land $ 6,259      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 23,287      
Land 6,269      
Buildings and Improvements 23,277      
Total 29,546      
Accumulated Depreciation 12/31/2018 $ 406      
1901 Raymond Ave SW [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Renton, WA      
Land $ 4,458      
Buildings and Improvements 2,659      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 532      
Land 4,594      
Buildings and Improvements 3,055      
Total 7,649      
Accumulated Depreciation 12/31/2018 $ 1,074      
19014 64th Avenue South [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Kent, WA      
Encumbrances $ 2,770      
Land 1,990      
Buildings and Improvements 3,979      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 456      
Land 2,042      
Buildings and Improvements 4,383      
Total 6,425      
Accumulated Depreciation 12/31/2018 $ 1,820      
18640 68th Avenue South [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Kent, WA      
Land $ 1,218      
Buildings and Improvements 1,950      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 310      
Land 1,258      
Buildings and Improvements 2,220      
Total 3,478      
Accumulated Depreciation 12/31/2018 $ 995      
6407 S 210th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Kent, WA      
Land $ 1,737      
Buildings and Improvements 3,508      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 0      
Land 1,737      
Buildings and Improvements 3,508      
Total 5,245      
Accumulated Depreciation 12/31/2018 $ 128      
1402 Puyallup Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Sumner, WA      
Land $ 3,766      
Buildings and Improvements 4,457      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 0      
Land 3,766      
Buildings and Improvements 4,457      
Total 8,223      
Accumulated Depreciation 12/31/2018 $ 0      
1944 Vista Bella Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Rancho Dominguez, CA      
Encumbrances $ 2,697      
Land 1,746      
Buildings and Improvements 3,148      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 465      
Land 1,822      
Buildings and Improvements 3,537      
Total 5,359      
Accumulated Depreciation 12/31/2018 $ 1,861      
2000 Vista Bella Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Rancho Dominguez, CA      
Encumbrances $ 1,174      
Land 817      
Buildings and Improvements 1,673      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 232      
Land 853      
Buildings and Improvements 1,869      
Total 2,722      
Accumulated Depreciation 12/31/2018 $ 996      
2835 East Ana Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Rancho Dominguez, CA      
Encumbrances $ 2,288      
Land 1,682      
Buildings and Improvements 2,750      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 409      
Land 1,772      
Buildings and Improvements 3,069      
Total 4,841      
Accumulated Depreciation 12/31/2018 $ 1,674      
665 N. Baldwin Park Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) City of Industry, CA      
Encumbrances $ 4,263      
Land 2,124      
Buildings and Improvements 5,219      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 2,542      
Land 2,143      
Buildings and Improvements 7,742      
Total 9,885      
Accumulated Depreciation 12/31/2018 $ 2,100      
27801 Avenue Scott [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Santa Clarita, CA      
Encumbrances $ 5,086      
Land 2,890      
Buildings and Improvements 7,020      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 196      
Land 2,902      
Buildings and Improvements 7,204      
Total 10,106      
Accumulated Depreciation 12/31/2018 $ 2,889      
2610 & 2660 Columbia [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Torrance, CA      
Encumbrances $ 3,927      
Land 3,008      
Buildings and Improvements 5,826      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 271      
Land 3,031      
Buildings and Improvements 6,074      
Total 9,105      
Accumulated Depreciation 12/31/2018 $ 2,376      
433 Alaska Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Torrance, CA      
Land $ 681      
Buildings and Improvements 168      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 3      
Land 684      
Buildings and Improvements 168      
Total 852      
Accumulated Depreciation 12/31/2018 $ 111      
6305 El Camino Real [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Carlsbad, CA      
Land $ 1,590      
Buildings and Improvements 6,360      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 7,730      
Land 1,590      
Buildings and Improvements 14,090      
Total 15,680      
Accumulated Depreciation 12/31/2018 $ 5,239      
2325 Camino Vida Roble [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Carlsbad, CA      
Encumbrances $ 1,785      
Land 1,441      
Buildings and Improvements 1,239      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 594      
Land 1,446      
Buildings and Improvements 1,828      
Total 3,274      
Accumulated Depreciation 12/31/2018 $ 692      
2335 Camino Vida Roble [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Carlsbad, CA      
Encumbrances $ 979      
Land 817      
Buildings and Improvements 762      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 216      
Land 821      
Buildings and Improvements 974      
Total 1,795      
Accumulated Depreciation 12/31/2018 $ 448      
2345 Camino Vida Roble [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Carlsbad, CA      
Encumbrances $ 637      
Land 562      
Buildings and Improvements 456      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 151      
Land 565      
Buildings and Improvements 604      
Total 1,169      
Accumulated Depreciation 12/31/2018 $ 270      
2355 Camino Vida Roble [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Carlsbad, CA      
Encumbrances $ 556      
Land 481      
Buildings and Improvements 365      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 174      
Land 483      
Buildings and Improvements 537      
Total 1,020      
Accumulated Depreciation 12/31/2018 $ 287      
2365 Camino Vida Roble [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Carlsbad, CA      
Encumbrances $ 1,022      
Land 1,098      
Buildings and Improvements 630      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 146      
Land 1,102      
Buildings and Improvements 772      
Total 1,874      
Accumulated Depreciation 12/31/2018 $ 418      
2375 Camino Vida Roble [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Carlsbad, CA      
Encumbrances $ 1,213      
Land 1,210      
Buildings and Improvements 874      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 140      
Land 1,214      
Buildings and Improvements 1,010      
Total 2,224      
Accumulated Depreciation 12/31/2018 $ 458      
6451 El Camino Real [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Carlsbad, CA      
Land $ 2,885      
Buildings and Improvements 1,931      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 733      
Land 2,895      
Buildings and Improvements 2,654      
Total 5,549      
Accumulated Depreciation 12/31/2018 $ 1,075      
13100 Gregg Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Poway, CA      
Encumbrances $ 2,889      
Land 1,040      
Buildings and Improvements 4,160      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 913      
Land 1,073      
Buildings and Improvements 5,040      
Total 6,113      
Accumulated Depreciation 12/31/2018 $ 2,344      
21730-21748 Marilla St. [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Chatsworth, CA      
Encumbrances $ 2,518      
Land 2,585      
Buildings and Improvements 3,210      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 44      
Land 2,608      
Buildings and Improvements 3,231      
Total 5,839      
Accumulated Depreciation 12/31/2018 $ 1,374      
8015 Paramount [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Pico Rivera, CA      
Land $ 3,616      
Buildings and Improvements 3,902      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (510)      
Land 3,657      
Buildings and Improvements 3,351      
Total 7,008      
Accumulated Depreciation 12/31/2018 $ 1,444      
3365 E. Slauson [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Vernon, CA      
Land $ 2,367      
Buildings and Improvements 3,243      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (559)      
Land 2,396      
Buildings and Improvements 2,655      
Total 5,051      
Accumulated Depreciation 12/31/2018 $ 1,144      
3015 East Ana [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Rancho Dominguez, CA      
Land $ 19,678      
Buildings and Improvements 9,321      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 6,305      
Land 20,144      
Buildings and Improvements 15,160      
Total 35,304      
Accumulated Depreciation 12/31/2018 $ 5,539      
1250 Rancho Conejo Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Thousand Oaks, CA      
Land $ 1,435      
Buildings and Improvements 779      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 45      
Land 1,441      
Buildings and Improvements 818      
Total 2,259      
Accumulated Depreciation 12/31/2018 $ 364      
1260 Rancho Conejo Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Thousand Oaks, CA      
Land $ 1,353      
Buildings and Improvements 722      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (722)      
Land 675      
Buildings and Improvements 678      
Total 1,353      
Accumulated Depreciation 12/31/2018 $ 272      
1270 Rancho Conejo Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Thousand Oaks, CA      
Land $ 1,224      
Buildings and Improvements 716      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (2)      
Land 1,229      
Buildings and Improvements 709      
Total 1,938      
Accumulated Depreciation 12/31/2018 $ 315      
1280 Rancho Conejo Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Thousand Oaks, CA      
Encumbrances $ 2,326      
Land 2,043      
Buildings and Improvements 3,408      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (59)      
Land 2,051      
Buildings and Improvements 3,341      
Total 5,392      
Accumulated Depreciation 12/31/2018 $ 894      
1290 Rancho Conejo Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Thousand Oaks, CA      
Encumbrances $ 1,957      
Land 1,754      
Buildings and Improvements 2,949      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (165)      
Land 1,761      
Buildings and Improvements 2,777      
Total 4,538      
Accumulated Depreciation 12/31/2018 $ 746      
100 West Sinclair Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Perris, CA      
Land $ 4,894      
Buildings and Improvements 3,481      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (5,233)      
Land 1,819      
Buildings and Improvements 1,323      
Total 3,142      
Accumulated Depreciation 12/31/2018 $ 721      
14050 Day Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Moreno Valley, CA      
Land $ 2,538      
Buildings and Improvements 2,538      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 574      
Land 2,565      
Buildings and Improvements 3,084      
Total 5,649      
Accumulated Depreciation 12/31/2018 $ 1,244      
12925 Marlay Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Fontana, CA      
Land $ 6,072      
Buildings and Improvements 7,891      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 303      
Land 6,090      
Buildings and Improvements 8,176      
Total 14,266      
Accumulated Depreciation 12/31/2018 $ 4,319      
18201-18291 Santa Fe [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Rancho Dominguez, CA      
Land $ 6,720      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 9,457      
Land 6,897      
Buildings and Improvements 9,280      
Total 16,177      
Accumulated Depreciation 12/31/2018 $ 2,523      
1011 Rancho Conejo [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Thousand Oaks, CA      
Encumbrances $ 4,341      
Land 7,717      
Buildings and Improvements 2,518      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (169)      
Land 7,752      
Buildings and Improvements 2,313      
Total 10,065      
Accumulated Depreciation 12/31/2018 $ 1,109      
20700 Denker Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Torrance, CA      
Encumbrances $ 5,290      
Land 5,767      
Buildings and Improvements 2,538      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,397      
Land 5,964      
Buildings and Improvements 3,739      
Total 9,703      
Accumulated Depreciation 12/31/2018 $ 2,384      
18408 Laurel Park Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Rancho Dominguez, CA      
Land $ 2,850      
Buildings and Improvements 2,850      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 913      
Land 2,874      
Buildings and Improvements 3,739      
Total 6,613      
Accumulated Depreciation 12/31/2018 $ 1,426      
19021 S. Reyes Ave [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Rancho Dominguez, CA      
Land $ 8,183      
Buildings and Improvements 7,501      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 233      
Land 8,545      
Buildings and Improvements 7,372      
Total 15,917      
Accumulated Depreciation 12/31/2018 $ 1,745      
24870 Nandina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Moreno Valley, CA      
Land $ 13,543      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 21,277      
Land 6,482      
Buildings and Improvements 28,338      
Total 34,820      
Accumulated Depreciation 12/31/2018 $ 4,772      
6185 Kimball Ave [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Chino, CA      
Land $ 6,385      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 12,343      
Land 6,382      
Buildings and Improvements 12,346      
Total 18,728      
Accumulated Depreciation 12/31/2018 $ 2,789      
5555 Bandini Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Bell, CA      
Land $ 32,536      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 21,620      
Land 32,540      
Buildings and Improvements 21,616      
Total 54,156      
Accumulated Depreciation 12/31/2018 $ 2,925      
16875 Heacock Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Moreno Valley, CA      
Land $ 0      
Buildings and Improvements 6,831      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (58)      
Land 0      
Buildings and Improvements 6,773      
Total 6,773      
Accumulated Depreciation 12/31/2018 $ 1,577      
4710 Guasti Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Ontario, CA      
Encumbrances $ 5,072      
Land 2,846      
Buildings and Improvements 6,564      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 213      
Land 2,846      
Buildings and Improvements 6,777      
Total 9,623      
Accumulated Depreciation 12/31/2018 $ 1,020      
17100 Perris Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Moreno Valley, CA      
Land $ 6,388      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 25,810      
Land 6,395      
Buildings and Improvements 25,803      
Total 32,198      
Accumulated Depreciation 12/31/2018 $ 3,379      
13414 South Figueroa [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Los Angeles, CA      
Encumbrances $ 3,914      
Land 1,701      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 6,580      
Land 1,887      
Buildings and Improvements 6,394      
Total 8,281      
Accumulated Depreciation 12/31/2018 $ 727      
3841 Ocean Ranch Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Oceanside, CA      
Land $ 4,400      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 8,040      
Land 4,400      
Buildings and Improvements 8,040      
Total 12,440      
Accumulated Depreciation 12/31/2018 $ 1,014      
3831 Ocean Ranch Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Oceanside, CA      
Land $ 2,693      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 4,584      
Land 2,694      
Buildings and Improvements 4,583      
Total 7,277      
Accumulated Depreciation 12/31/2018 $ 560      
3821 Ocean Ranch Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Oceanside, CA      
Land $ 2,792      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 4,469      
Land 2,792      
Buildings and Improvements 4,469      
Total 7,261      
Accumulated Depreciation 12/31/2018 $ 528      
145 West 134th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Los Angeles, CA      
Land $ 2,901      
Buildings and Improvements 2,285      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 173      
Land 2,901      
Buildings and Improvements 2,458      
Total 5,359      
Accumulated Depreciation 12/31/2018 $ 397      
6150 Sycamore Canyon Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Riverside, CA      
Land $ 3,182      
Buildings and Improvements 10,643      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1      
Land 3,182      
Buildings and Improvements 10,644      
Total 13,826      
Accumulated Depreciation 12/31/2018 $ 1,257      
17825 Indian Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Moreno Valley, CA      
Land $ 5,034      
Buildings and Improvements 22,095      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 54      
Land 5,034      
Buildings and Improvements 22,149      
Total 27,183      
Accumulated Depreciation 12/31/2018 $ 2,433      
24901 San Michele Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Moreno Valley, CA      
Land $ 1,274      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 11,556      
Land 1,274      
Buildings and Improvements 11,556      
Total 12,830      
Accumulated Depreciation 12/31/2018 $ 826      
1445 Engineer Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Vista, CA      
Land $ 6,816      
Buildings and Improvements 4,417      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 3      
Land 6,816      
Buildings and Improvements 4,420      
Total 11,236      
Accumulated Depreciation 12/31/2018 $ 600      
19067 Reyes Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Rancho Dominguez, CA      
Land $ 9,281      
Buildings and Improvements 3,920      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 3,474      
Land 9,381      
Buildings and Improvements 7,294      
Total 16,675      
Accumulated Depreciation 12/31/2018 $ 446      
10586 Tamarind Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Fontana, CA      
Land $ 4,275      
Buildings and Improvements 8,275      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 228      
Land 4,275      
Buildings and Improvements 8,503      
Total 12,778      
Accumulated Depreciation 12/31/2018 $ 424      
2777 Loker Avenue West [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Carlsbad, CA      
Encumbrances $ 11,028      
Land 7,599      
Buildings and Improvements 13,267      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 122      
Land 7,599      
Buildings and Improvements 13,389      
Total 20,988      
Accumulated Depreciation 12/31/2018 $ 822      
7105 Old 215 Frontage Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Riverside, CA      
Land $ 4,900      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 12,742      
Land 4,900      
Buildings and Improvements 12,742      
Total 17,642      
Accumulated Depreciation 12/31/2018 $ 540      
28545 Livingston Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Valencia, CA      
Land $ 9,813      
Buildings and Improvements 10,954      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 644      
Land 9,813      
Buildings and Improvements 11,598      
Total 21,411      
Accumulated Depreciation 12/31/2018 $ 335      
3801 Ocean Ranch Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Oceanside, CA      
Encumbrances $ 3,046      
Land 2,907      
Buildings and Improvements 6,151      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1      
Land 2,909      
Buildings and Improvements 6,150      
Total 9,059      
Accumulated Depreciation 12/31/2018 $ 174      
3809 Ocean Ranch Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Oceanside, CA      
Encumbrances $ 3,279      
Land 3,140      
Buildings and Improvements 6,964      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (2)      
Land 3,141      
Buildings and Improvements 6,961      
Total 10,102      
Accumulated Depreciation 12/31/2018 $ 180      
3817 Ocean Ranch Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Oceanside, CA      
Encumbrances $ 5,132      
Land 5,438      
Buildings and Improvements 10,278      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 209      
Land 5,442      
Buildings and Improvements 10,483      
Total 15,925      
Accumulated Depreciation 12/31/2018 $ 281      
24385 Nandina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Moreno Valley, CA      
Land $ 17,023      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 57,083      
Land 17,066      
Buildings and Improvements 57,040      
Total 74,106      
Accumulated Depreciation 12/31/2018 $ 237      
14999 Summit Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Eastvale, CA      
Land $ 1,508      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 3,120      
Land 1,508      
Buildings and Improvements 3,120      
Total 4,628      
Accumulated Depreciation 12/31/2018 $ 51      
14969 Summit Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Eastvale, CA      
Land $ 3,847      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 11,211      
Land 3,847      
Buildings and Improvements 11,211      
Total 15,058      
Accumulated Depreciation 12/31/2018 $ 299      
14939 Summit Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Eastvale, CA      
Land $ 3,107      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 8,273      
Land 3,107      
Buildings and Improvements 8,273      
Total 11,380      
Accumulated Depreciation 12/31/2018 $ 138      
14909 Summit Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Eastvale, CA      
Land $ 7,099      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 19,177      
Land 7,099      
Buildings and Improvements 19,177      
Total 26,276      
Accumulated Depreciation 12/31/2018 $ 317      
14940 Summit Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Eastvale, CA      
Land $ 5,423      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 13,334      
Land 5,423      
Buildings and Improvements 13,334      
Total 18,757      
Accumulated Depreciation 12/31/2018 $ 194      
14910 Summit Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Eastvale, CA      
Land $ 1,873      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 5,290      
Land 1,873      
Buildings and Improvements 5,290      
Total 7,163      
Accumulated Depreciation 12/31/2018 $ 77      
6821-6857 Hazelwood Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Berkeley, MO      
Encumbrances $ 4,289      
Land 985      
Buildings and Improvements 6,205      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,333      
Land 985      
Buildings and Improvements 7,538      
Total 8,523      
Accumulated Depreciation 12/31/2018 $ 3,075      
13701 Rider Trail North [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Earth City, MO      
Land $ 800      
Buildings and Improvements 2,099      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 552      
Land 804      
Buildings and Improvements 2,647      
Total 3,451      
Accumulated Depreciation 12/31/2018 $ 1,154      
1908-2000 Innerbelt [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Overland, MO      
Encumbrances $ 6,587      
Land 1,590      
Buildings and Improvements 9,026      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,464      
Land 1,591      
Buildings and Improvements 10,489      
Total 12,080      
Accumulated Depreciation 12/31/2018 $ 5,236      
21-25 Gateway Commerce Center [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Edwardsville, IL      
Land $ 1,874      
Buildings and Improvements 31,958      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 378      
Land 1,921      
Buildings and Improvements 32,289      
Total 34,210      
Accumulated Depreciation 12/31/2018 $ 10,970      
5525 Johns Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Tampa, FL      
Land $ 192      
Buildings and Improvements 1,086      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 274      
Land 200      
Buildings and Improvements 1,352      
Total 1,552      
Accumulated Depreciation 12/31/2018 $ 719      
5709 Johns Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Tampa, FL      
Land $ 192      
Buildings and Improvements 1,086      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 207      
Land 200      
Buildings and Improvements 1,285      
Total 1,485      
Accumulated Depreciation 12/31/2018 $ 664      
5711 Johns Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Tampa, FL      
Land $ 243      
Buildings and Improvements 1,376      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 184      
Land 255      
Buildings and Improvements 1,548      
Total 1,803      
Accumulated Depreciation 12/31/2018 $ 796      
5455 W Waters Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Tampa, FL      
Land $ 307      
Buildings and Improvements 1,742      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 370      
Land 326      
Buildings and Improvements 2,093      
Total 2,419      
Accumulated Depreciation 12/31/2018 $ 1,056      
5553 W Waters Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Tampa, FL      
Land $ 307      
Buildings and Improvements 1,742      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 310      
Land 326      
Buildings and Improvements 2,033      
Total 2,359      
Accumulated Depreciation 12/31/2018 $ 1,037      
5501 W Waters Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Tampa, FL      
Land $ 215      
Buildings and Improvements 871      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 403      
Land 242      
Buildings and Improvements 1,247      
Total 1,489      
Accumulated Depreciation 12/31/2018 $ 587      
5503 W Waters Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Tampa, FL      
Land $ 98      
Buildings and Improvements 402      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 197      
Land 110      
Buildings and Improvements 587      
Total 697      
Accumulated Depreciation 12/31/2018 $ 291      
5555 W Waters Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Tampa, FL      
Land $ 213      
Buildings and Improvements 1,206      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 552      
Land 221      
Buildings and Improvements 1,750      
Total 1,971      
Accumulated Depreciation 12/31/2018 $ 761      
5557 W Waters Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Tampa, FL      
Land $ 59      
Buildings and Improvements 335      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 51      
Land 62      
Buildings and Improvements 383      
Total 445      
Accumulated Depreciation 12/31/2018 $ 197      
5463 W Waters Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Tampa, FL      
Land $ 497      
Buildings and Improvements 2,751      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,462      
Land 560      
Buildings and Improvements 4,150      
Total 4,710      
Accumulated Depreciation 12/31/2018 $ 1,892      
5461 W Waters Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Tampa, FL      
Land $ 261      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,322      
Land 265      
Buildings and Improvements 1,318      
Total 1,583      
Accumulated Depreciation 12/31/2018 $ 662      
5481 W Waters Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Tampa, FL      
Land $ 558      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 3,570      
Land 561      
Buildings and Improvements 3,567      
Total 4,128      
Accumulated Depreciation 12/31/2018 $ 1,161      
4908 Tampa West Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Tampa, FL      
Land $ 2,622      
Buildings and Improvements 8,643      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (814)      
Land 2,635      
Buildings and Improvements 7,816      
Total 10,451      
Accumulated Depreciation 12/31/2018 $ 3,924      
1815-1957 South 4650 West [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Salt Lake City, UT      
Encumbrances $ 6,045      
Land 1,707      
Buildings and Improvements 10,873      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 62      
Land 1,713      
Buildings and Improvements 10,929      
Total 12,642      
Accumulated Depreciation 12/31/2018 $ 3,980      
3200 Pond Station [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Jefferson County, KY      
Land $ 2,074      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 9,681      
Land 2,120      
Buildings and Improvements 9,635      
Total 11,755      
Accumulated Depreciation 12/31/2018 $ 2,822      
581 Welltown Road Tyson Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Winchester, VA      
Land $ 2,320      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 11,109      
Land 2,401      
Buildings and Improvements 11,028      
Total 13,429      
Accumulated Depreciation 12/31/2018 $ 3,158      
7501 NW 106th Terrace [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Kansas City, MO      
Land $ 4,152      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 13,697      
Land 4,228      
Buildings and Improvements 13,621      
Total 17,849      
Accumulated Depreciation 12/31/2018 $ 3,481      
600 Greene Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Greenville, KY      
Land $ 294      
Buildings and Improvements 8,570      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision (727)      
Land 296      
Buildings and Improvements 7,841      
Total 8,137      
Accumulated Depreciation 12/31/2018 $ 6,453      
First Park Fairburn [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Fairburn, GA      
Land $ 3,650      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 5,284      
Land 3,650      
Buildings and Improvements 5,284      
Total 8,934      
Accumulated Depreciation 12/31/2018 $ 0      
First Perry Logistics Center [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Perris, CA      
Land $ 1,780      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 4,550      
Land 1,788      
Buildings and Improvements 4,542      
Total 6,330      
Accumulated Depreciation 12/31/2018 $ 0      
First Mountain Creek Distribution Center [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Dallas, TX      
Land $ 4,675      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 7,468      
Land 4,779      
Buildings and Improvements 7,364      
Total 12,143      
Accumulated Depreciation 12/31/2018 $ 0      
First Park 121 Building I [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Lewisville, TX      
Land $ 3,963      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 3,421      
Land 3,963      
Buildings and Improvements 3,421      
Total 7,384      
Accumulated Depreciation 12/31/2018 $ 0      
First Park 121 Building II [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Lewisville, TX      
Land $ 2,243      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 1,938      
Land 2,243      
Buildings and Improvements 1,938      
Total 4,181      
Accumulated Depreciation 12/31/2018 $ 0      
First Aurora Commerce Center Bldg D [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Aurora, CO      
Land $ 4,881      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 8,021      
Land 4,886      
Buildings and Improvements 8,016      
Total 12,902      
Accumulated Depreciation 12/31/2018 $ 0      
First Glacier Logistics Center [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Location (City/State) Sumner, WA      
Land $ 2,643      
Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 4,023      
Land 2,643      
Buildings and Improvements 4,023      
Total 6,666      
Accumulated Depreciation 12/31/2018 0      
Developments / Land Parcels [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 2,473      
Land 167,785      
Buildings and Improvements 3,225      
Costs Capitalized Subsequent to Acquisition or Completion and Valuation Provision 33,539      
Land 163,868      
Buildings and Improvements 40,681      
Total 204,549      
Accumulated Depreciation 12/31/2018 $ 4,341