XML 89 R103.htm IDEA: XBRL DOCUMENT v2.4.0.8
Schedule III (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,726,455,000 $ 5,389,166,000 $ 4,887,560,000
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,057,680,000 1,072,859,000 958,652,000
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,389,166,000 4,887,560,000 4,518,560,000
Real Estate Additions 1,891,117,000 505,643,000 418,712,000
Real Estate, Cost of Real Estate Sold (553,828,000) (4,037,000) (49,712,000)
Real Estate, Gross 6,726,455,000 5,389,166,000 4,887,560,000
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,072,859,000 958,652,000 845,305,000
Real Estate Accumulated Depreciation, Depreciation Expense 162,546,000 140,570,000 144,284,000
Real Estate Accumulated Depreciation, Real Estate Sold (177,725,000) (26,363,000) (30,937,000)
Real Estate Accumulated Depreciation 1,057,680,000 1,072,859,000 958,652,000
Total Real Estate [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Amount of Encumbrances 64,974,227    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,317,562,696    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,829,350,974    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,576,962,929    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,372,509,954    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,353,945,770    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,726,455,724    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,057,679,601    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,726,455,724    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,057,679,601    
Allianz, John Hancock and LaSalle Bank [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Net Book Value of Collateralized Real Estate Properties 475,800,000    
Operating Properties [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Amount of Encumbrances 64,974,227    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,079,681,038    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,829,350,974    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,375,181,699    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,139,454,639    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,144,759,070    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,284,213,709    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,057,679,601    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,284,213,709    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,057,679,601    
Operating Properties [Member] | 1000 South Loop West [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 509,351    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,549,504    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 255,499    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 509,351    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,805,003    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,314,354    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 36,289    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,314,354    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 36,289    
Operating Properties [Member] | 10241 W Little York Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 558,491    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,740,552    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 129,761    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 558,491    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,870,313    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,428,804    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 40,844    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,428,804    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 40,844    
Operating Properties [Member] | 10245 W Little York Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 426,927    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,460,513    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 64,622    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 426,927    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,525,135    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,952,062    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 32,514    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,952,062    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 32,514    
Operating Properties [Member] | 2121 Southtech Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Greenwood, IN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 272,823    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,606,920    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 411,808    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 272,823    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,018,729    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,291,552    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 51,669    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,291,552    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 51,669    
Operating Properties [Member] | 800 Commerce Parkway West Dr [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Greenwood, IN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,374,664    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 29,963,830    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,317,168    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,374,664    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 31,280,998    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 32,655,662    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 259,427    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 32,655,662    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 259,427    
Operating Properties [Member] | 6600 Business Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Elkridge, MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,680,220    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 14,671,910    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 395,344    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,680,220    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 15,067,254    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 18,747,474    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 105,499    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 18,747,474    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 105,499    
Operating Properties [Member] | 2785 Commerce Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Bethlehem, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 11,961,623    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 45,390,365    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 12,009,985    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 45,342,003    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 420,478    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 420,478    
Operating Properties [Member] | 8212 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 820,882    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,322,720    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 37,907    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 820,882    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,360,627    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,181,509    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 983,441    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1996    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,181,509    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 983,441    
Operating Properties [Member] | 701 Distribution Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Morrisville, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,300,889    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,313,226    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 207,184    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,301,211    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,520,088    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,821,299    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 982,101    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,821,299    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 982,101    
Operating Properties [Member] | 300 Technology Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 368,626    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,351,625    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 374,497    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,345,754    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,720,251    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 884,437    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,720,251    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 884,437    
Operating Properties [Member] | 120 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 533,142    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,830,515    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,855,500    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 558,142    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,661,015    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,219,157    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,639,758    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1980    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,219,157    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,639,758    
Operating Properties [Member] | 116 Pleasant Ridge Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Greenville, SC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,547,811    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 14,172,014    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,712,683    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 12,007,142    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 15,719,825    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,664,305    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 15,719,825    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,664,305    
Operating Properties [Member] | 1501 Perryman Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Aberdeen, MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 5,813,324    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 18,874,059    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,131,464    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,816,839    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 24,002,008    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 29,818,847    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 4,447,800    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 29,818,847    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 4,447,800    
Operating Properties [Member] | 869 S Route 53 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Addison, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,194,223    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,201,881    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 50,460    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,194,223    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,252,342    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,446,565    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 32,013    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,446,565    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 32,013    
Operating Properties [Member] | 901 S Route 53 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Addison, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,055,066    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,984,093    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 118,292    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,055,066    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,102,385    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,157,451    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 45,479    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,157,451    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 45,479    
Operating Properties [Member] | 400 Nestle Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 8,065,500    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 27,602,841    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 8,184,096    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 27,484,245    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 35,668,341    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 12,798,838    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 35,668,341    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 12,798,838    
Operating Properties [Member] | 7248 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,670,849    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 13,307,408    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,513,163    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,670,673    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 17,820,747    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 20,491,420    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 7,278,499    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 20,491,420    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 7,278,499    
Operating Properties [Member] | 7339 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,187,776    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 7,587,682    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,197,447    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,578,011    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,775,458    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,127,648    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1996    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,775,458    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,127,648    
Operating Properties [Member] | 7437 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 717,488    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,022,413    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,176,937    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 726,651    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,190,186    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,916,837    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 4,527,473    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1976    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,916,837    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 4,527,473    
Operating Properties [Member] | 700 Nestle Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,473,120    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 20,186,320    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,174,970    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 19,484,470    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 23,659,440    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 8,849,079    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 23,659,440    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 8,849,079    
Operating Properties [Member] | 8014 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 4,019,258    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 9,880,091    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,645,117    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,254,232    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 13,899,349    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 4,392,952    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 13,899,349    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 4,392,952    
Operating Properties [Member] | 705 Boulder Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 10,594,027    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 28,536,883    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 10,596,767    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 28,534,143    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 39,130,910    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 9,283,319    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 39,130,910    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 9,283,319    
Operating Properties [Member] | 651 Boulder Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 4,308,646    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 17,689,842    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,308,646    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 17,689,842    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 21,998,488    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 6,583,129    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 21,998,488    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 6,583,129    
Operating Properties [Member] | 8150 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,564,167    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 8,961,554    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,571,466    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,954,255    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 11,525,721    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,579,485    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 11,525,721    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,579,485    
Operating Properties [Member] | 8250 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,025,667    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,245,086    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,035,854    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,234,899    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,270,753    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,651,004    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,270,753    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,651,004    
Operating Properties [Member] | 650 Boulder Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 5,208,248    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 31,938,579    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 9,961,788    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 27,185,039    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 37,146,827    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 7,512,248    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 37,146,827    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 7,512,248    
Operating Properties [Member] | 7165 Ambassador Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 792,999    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,556,918    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 804,848    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,545,069    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,349,917    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,590,637    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,349,917    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,590,637    
Operating Properties [Member] | 200 Boulder Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 4,722,683    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 18,922,645    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 440,557    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,722,683    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 19,363,202    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 24,085,885    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 4,655,569    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 24,085,885    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 4,655,569    
Operating Properties [Member] | 250 Boulder Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,599,936    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 12,099,145    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,149,322    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,717,733    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 14,130,670    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 17,848,403    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,760,264    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 17,848,403    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,760,264    
Operating Properties [Member] | 8400 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 6,725,948    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 27,079,140    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 7,521,211    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 26,283,877    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 33,805,088    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 5,400,471    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 33,805,088    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 5,400,471    
Operating Properties [Member] | 6560 Stonegate Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 458,281    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,805,111    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 458,945    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,804,447    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,263,392    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,843,559    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,263,392    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,843,559    
Operating Properties [Member] | 6370 Hedgewood Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 540,795    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,959,133    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 541,459    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,958,469    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,499,928    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,988,574    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,499,928    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,988,574    
Operating Properties [Member] | 6390 Hedgewood Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 707,203    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,000,621    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 707,867    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,999,957    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,707,824    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,637,716    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,707,824    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,637,716    
Operating Properties [Member] | 6350 Hedgewood Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 360,027    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,028,297    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 560,691    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,827,633    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,388,324    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,142,023    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,388,324    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,142,023    
Operating Properties [Member] | 6330 Hedgewood Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 531,268    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,359,739    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 532,047    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,358,960    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,891,007    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,292,239    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,891,007    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,292,239    
Operating Properties [Member] | 6580 Snowdrift Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 388,328    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,211,286    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 389,081    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,210,533    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,599,614    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,461,382    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,599,614    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,461,382    
Operating Properties [Member] | 6540 Stonegate Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 422,042    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,012,192    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 422,730    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,011,504    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,434,234    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,538,102    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,434,234    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,538,102    
Operating Properties [Member] | 6520 Stonegate Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 453,315    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,712,509    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 484,361    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,681,463    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,165,824    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 894,982    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1996    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,165,824    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 894,982    
Operating Properties [Member] | 7620 Cetronia Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Allentown, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,091,806    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,851,456    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 258,140    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,093,724    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,107,678    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,201,402    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,914,712    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,201,402    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,914,712    
Operating Properties [Member] | 180,190 Cochrane Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Annapolis, MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 545,757    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 545,757    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 545,757    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 545,757    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Operating Properties [Member] | 4606 Richlynn Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Belcamp, MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 299,600    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,818,861    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 712,788    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 299,600    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,531,649    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,831,249    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 914,347    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,831,249    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 914,347    
Operating Properties [Member] | 74 West Broad Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Bethlehem, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,096,127    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 14,202,628    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,099,079    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 14,199,676    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 15,298,755    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 5,877,473    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 15,298,755    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 5,877,473    
Operating Properties [Member] | 6601-6625 W. 78th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Bloomington, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,263,060    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 41,314,332    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,310,246    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 41,267,146    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 43,577,392    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 15,344,697    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 43,577,392    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 15,344,697    
Operating Properties [Member] | 6161 Green Valley Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Bloomington, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 740,378    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,311,602    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,114,197    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 709,961    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,456,216    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,166,177    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,906,331    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1992    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,166,177    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,906,331    
Operating Properties [Member] | 10801 Nesbitt Avenue South [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Bloomington, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 784,577    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,010,219    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 786,382    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,008,414    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,794,796    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,389,997    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,794,796    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,389,997    
Operating Properties [Member] | 5775 West Old Shakopee Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Bloomington, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,052,018    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,849,649    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,669,598    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,060,644    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,510,621    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,571,265    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,948,075    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,571,265    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,948,075    
Operating Properties [Member] | 5715 Old Shakopee Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Bloomington, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,263,226    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,360,782    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,081,249    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,264,758    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,440,499    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,705,257    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,494,873    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,705,257    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,494,873    
Operating Properties [Member] | 5735 Old Shakopee Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Bloomington, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,263,226    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,360,782    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,028,892    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,264,758    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,388,142    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,652,900    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,090,634    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,652,900    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,090,634    
Operating Properties [Member] | 5705 Old Shakopee Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Bloomington, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,113,223    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,520,731    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,148,571    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,485,383    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,633,954    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,632,626    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,633,954    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,632,626    
Operating Properties [Member] | 951 Broken Sound Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Boca Raton, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,426,251    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,098,952    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,818,945    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,426,251    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,917,897    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,344,148    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,374,737    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1986    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,344,148    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,374,737    
Operating Properties [Member] | 1455 Remington Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Bolingbrook, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,501,294    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 10,704,719    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,501,294    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,704,719    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 13,206,013    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 299,947    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 13,206,013    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 299,947    
Operating Properties [Member] | 150 E Crossroads Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Bolingbrook, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,078,949    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 14,143,377    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 845,243    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,078,949    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 14,988,620    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 18,067,569    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 127,295    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 18,067,569    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 127,295    
Operating Properties [Member] | 553 S Joliet Ave [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Bolingbrook, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,764,831    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 15,109,947    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 621,121    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,764,831    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 15,731,068    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 19,495,899    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 155,088    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 19,495,899    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 155,088    
Operating Properties [Member] | 777 Yamato Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Boca Raton, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 4,101,247    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 16,077,347    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 6,795,258    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,501,247    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 22,472,605    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 26,973,852    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 8,814,520    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1987    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 26,973,852    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 8,814,520    
Operating Properties [Member] | 750 Park of Commerce Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Boca Raton, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,430,000    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 22,129,358    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,473,406    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 22,085,952    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 24,559,358    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,712,965    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 24,559,358    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,712,965    
Operating Properties [Member] | 400 Boulder Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Breinigsville, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,859,106    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 10,599,615    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,865,575    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,593,146    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 13,458,721    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,496,467    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2003    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 13,458,721    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,496,467    
Operating Properties [Member] | 8201 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Breinigsville, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,089,719    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 8,353,910    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,222,168    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,221,461    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 10,443,629    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,624,672    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 10,443,629    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,624,672    
Operating Properties [Member] | 8500 Industrial Bouldvard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Breinigsville, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 8,752,708    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 39,685,301    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 11,511,499    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 36,926,510    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 48,438,009    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 6,658,524    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 48,438,009    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 6,658,524    
Operating Properties [Member] | 860 Nestle Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Breinigsville, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 8,118,881    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 18,885,486    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 7,400,855    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 8,118,881    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 26,286,341    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 34,405,222    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 6,820,111    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 34,405,222    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 6,820,111    
Operating Properties [Member] | 1485 W Commerce Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Carlisle, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 4,249,868    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 13,886,039    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,241,826    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,095,262    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 16,282,471    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 20,377,733    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 4,752,884    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 20,377,733    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 4,752,884    
Operating Properties [Member] | 95 Kriner Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Chambersburg, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 8,695,501    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 34,926,589    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 9,407,871    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 34,214,219    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 43,622,090    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 4,617,807    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 43,622,090    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 4,617,807    
Operating Properties [Member] | 9000 109th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Champlin, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,251,043    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 11,662,995    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 86,100    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,251,043    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 11,749,095    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 13,000,138    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 815,277    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 13,000,138    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 815,277    
Operating Properties [Member] | 11701 Goodrich Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Charlotte, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,054,621    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,356,151    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 461,642    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,054,621    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,817,792    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,872,413    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 108,858    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,872,413    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 108,858    
Operating Properties [Member] | 12810 Virkler Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Charlotte, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 475,368    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,367,586    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 706,208    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 476,262    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,072,899    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,549,161    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 209,041    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2010    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,549,161    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 209,041    
Operating Properties [Member] | 2700 Hutchinson McDonald Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Charlotte, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 912,500    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,721,259    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 69,635    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 912,500    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,790,894    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,703,394    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 320,147    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,703,394    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 320,147    
Operating Properties [Member] | 2701 Hutchinson McDonald Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Charlotte, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,275,000    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,649,750    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 260,294    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,275,000    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,910,044    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,185,044    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 337,129    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,185,044    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 337,129    
Operating Properties [Member] | 2730 Hutchinson McDonald Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Charlotte, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,878,750    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 10,129,499    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,034    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,878,750    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,132,533    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 12,011,283    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 609,763    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 12,011,283    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 609,763    
Operating Properties [Member] | 2801 Hutchinson McDonald Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Charlotte, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,065,000    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,975,250    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 167,601    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,065,000    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,142,851    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,207,851    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 441,336    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,207,851    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 441,336    
Operating Properties [Member] | 3000 Crosspoint Center Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Charlotte, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,831,250    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 10,779,412    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 171,533    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,831,250    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,950,945    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 12,782,195    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 705,320    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 12,782,195    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 705,320    
Operating Properties [Member] | 3005 Crosspoint Center Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Charlotte, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,990,000    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,561,540    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 433,141    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,990,000    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,994,681    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,984,681    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 439,153    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,984,681    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 439,153    
Operating Properties [Member] | 4045 Perimeter West Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Charlotte, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,418,928    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,511,050    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 26,915    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,418,928    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,537,965    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,956,893    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 568,940    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,956,893    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 568,940    
Operating Properties [Member] | 4525 Statesville Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Charlotte, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 841,250    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,279,315    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 167,556    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 837,144    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,450,977    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,288,121    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 331,322    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,288,121    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 331,322    
Operating Properties [Member] | 4835 Sirona Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Charlotte, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 4,243,165    
Real Estate and Accumulated Depreciation, Initial Cost of Land 690,750    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,086,388    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 172,041    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 690,750    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,258,429    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,949,179    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 207,403    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,949,179    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 207,403    
Operating Properties [Member] | 4925 Sirona Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Charlotte, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 4,164,318    
Real Estate and Accumulated Depreciation, Initial Cost of Land 603,003    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,969,011    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 603,003    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,969,011    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,572,014    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 211,106    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,572,014    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 211,106    
Operating Properties [Member] | 5033 Sirona Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Charlotte, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 3,634,246    
Real Estate and Accumulated Depreciation, Initial Cost of Land 509,247    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,710,218    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 160,736    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 613,962    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,766,239    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,380,201    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 162,055    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,380,201    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 162,055    
Operating Properties [Member] | 8910 Pioneer Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Charlotte, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 527,873    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,959,206    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 46,726    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 527,873    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,005,932    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,533,805    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 302,605    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,533,805    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 302,605    
Operating Properties [Member] | 8916 Pioneer Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Charlotte, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 557,730    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,785,333    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 340,623    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 557,730    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,125,956    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,683,686    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 355,651    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,683,686    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 355,651    
Operating Properties [Member] | 1309 Executive Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Chesapeake, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 926,125    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,098,066    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 955,374    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,068,817    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,024,191    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,628,773    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,024,191    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,628,773    
Operating Properties [Member] | 1305 Executive Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Chesapeake, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 861,020    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,975,983    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,129,850    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,707,153    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,837,003    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,276,635    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,837,003    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,276,635    
Operating Properties [Member] | 1313 Executive Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Chesapeake, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,180,036    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,146,319    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,708,050    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,618,305    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,326,355    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,467,773    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,326,355    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,467,773    
Operating Properties [Member] | 2601 Indian River Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Chesapeake, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,711,746    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 10,418,032    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 433,142    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,711,746    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,851,174    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 12,562,920    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 91,239    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 12,562,920    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 91,239    
Operating Properties [Member] | 500 Independence Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Chesapeake, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 864,150    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,427,285    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 660,242    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 866,609    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,085,068    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,951,677    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,418,193    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,951,677    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,418,193    
Operating Properties [Member] | 700 Independence Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Chesapeake, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,950,375    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,236,994    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 675,718    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,951,135    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,911,952    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,863,087    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,365,051    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,863,087    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,365,051    
Operating Properties [Member] | 1540 S 54th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Cicero, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,540,236    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 20,130,552    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 927,655    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,540,236    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 21,058,207    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 24,598,443    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 162,747    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 24,598,443    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 162,747    
Operating Properties [Member] | 4650 Lake Forest Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Cinncinnati, OH    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,030,242    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,003,024    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 115,772    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,030,242    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,118,795    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,149,037    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 39,758    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,149,037    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 39,758    
Operating Properties [Member] | 4750 Lake Forest Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Cinncinnati, OH    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,138,166    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,914,789    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 197,670    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,138,166    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,112,459    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,250,625    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 58,433    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,250,625    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 58,433    
Operating Properties [Member] | 9645 Gerwig Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Columbia, MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,915,960    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,461,228    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 320,391    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,915,960    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,781,619    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,697,579    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 59,613    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,697,579    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 59,613    
Operating Properties [Member] | 2550 John Glenn Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Columbus, OH    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 540,601    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,129,342    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 169,332    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 540,601    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,298,674    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,839,275    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 41,107    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,839,275    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 41,107    
Operating Properties [Member] | 3800 Twin Creeks Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Columbus, OH    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 549,393    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,643,302    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 181,695    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 549,393    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,824,997    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,374,390    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 41,734    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,374,390    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 41,734    
Operating Properties [Member] | 455 Airline Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Coppell, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 312,701    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,311,531    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 334,283    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 312,701    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,645,814    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,958,515    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 17,627    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,958,515    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 17,627    
Operating Properties [Member] | 2130 Baldwin Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Crofton, MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,172,032    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,350,782    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 418,907    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,172,032    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,769,689    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 10,941,721    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 64,488    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 10,941,721    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 64,488    
Operating Properties [Member] | 329-333 Herrod Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Dayton, NJ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 4,039,559    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 20,863,051    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 937,014    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,039,559    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 21,800,065    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 25,839,624    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 155,086    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 25,839,624    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 155,086    
Operating Properties [Member] | 501 Independence Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Chesapeake, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,202,556    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,975,538    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,572,766    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,292,273    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,458,587    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,750,860    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,863,791    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,750,860    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,863,791    
Operating Properties [Member] | 505 Independence Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Chesapeake, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,292,062    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,456,515    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,274,225    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,292,254    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,730,547    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,022,801    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,773,034    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,022,801    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,773,034    
Operating Properties [Member] | 510 Independence Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Chesapeake, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,012,149    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,546,882    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 996,838    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,014,689    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,541,181    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 10,555,870    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,161,922    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 10,555,870    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,161,922    
Operating Properties [Member] | 1301 Executive Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Chesapeake, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 997,570    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,163,173    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 970,151    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,190,592    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,160,743    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,164,892    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,160,743    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,164,892    
Operating Properties [Member] | 676 Independence Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Chesapeake, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,527,303    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 11,321,991    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,562,903    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 11,286,391    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 12,849,294    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,339,355    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 12,849,294    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,339,355    
Operating Properties [Member] | 1250 Hall Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Deer Park, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 2,722,013    
Real Estate and Accumulated Depreciation, Initial Cost of Land 829,570    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,778,327    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 47,399    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 831,611    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,823,685    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,655,296    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 934,423    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,655,296    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 934,423    
Operating Properties [Member] | 301-321 S Goolsby Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Deerfield Beach, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 498,136    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,781,180    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 18,971    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 498,136    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,800,151    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,298,287    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 22,061    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,298,287    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 22,061    
Operating Properties [Member] | 1680 Executive Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Duluth, GA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,928,412    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,651,819    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 573,340    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,928,412    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,225,159    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,153,571    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 62,809    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,153,571    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 62,809    
Operating Properties [Member] | 1700 Executive Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Duluth, GA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,082,072    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,496,599    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 319,679    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,082,072    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,816,278    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,898,350    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 30,845    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,898,350    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 30,845    
Operating Properties [Member] | 2670 Breckinridge Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Duluth, GA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,676,415    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,567,592    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 328,885    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,676,415    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,896,478    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,572,893    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 61,091    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,572,893    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 61,091    
Operating Properties [Member] | 170 Parkway West [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Duncan, SC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 598,348    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,643,756    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 203,325    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 598,918    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,846,511    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,445,429    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 860,720    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,445,429    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 860,720    
Operating Properties [Member] | 190 Parkway West [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Duncan, SC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 551,663    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,310,993    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 153,027    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 552,211    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,463,471    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,015,682    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 680,980    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,015,682    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 680,980    
Operating Properties [Member] | 265 Parkway East [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Duncan, SC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 901,444    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,751,389    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 190,639    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 902,374    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,941,098    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,843,472    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,430,296    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,843,472    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,430,296    
Operating Properties [Member] | 285 Parkway East [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Duncan, SC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 975,433    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,851,990    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 358,457    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 976,393    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,209,487    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,185,880    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,219,786    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,185,880    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,219,786    
Operating Properties [Member] | 3169 Dodd Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eagan, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 988,594    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,586,907    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 988,594    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,586,907    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,575,501    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 343,323    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,575,501    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 343,323    
Operating Properties [Member] | 3255 Neil Armstrong Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eagan, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,131,017    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,372,043    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,103,860    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,399,200    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,503,060    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,275,823    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,503,060    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,275,823    
Operating Properties [Member] | 3711 Kennebec Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eagan, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 999,702    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,042,589    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,966    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 999,702    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,047,555    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,047,257    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 381,896    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,047,257    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 381,896    
Operating Properties [Member] | 10301-10305 West 70th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eden Prairie, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 120,622    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,085,226    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 474,001    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 118,300    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,561,549    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,679,849    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 722,729    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1984    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,679,849    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 722,729    
Operating Properties [Member] | 10321 West 70th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eden Prairie, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 145,198    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,305,700    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 568,632    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 142,399    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,877,131    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,019,530    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 666,111    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1984    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,019,530    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 666,111    
Operating Properties [Member] | 10333 West 70th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eden Prairie, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 110,746    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 995,868    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 351,149    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 108,610    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,349,153    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,457,763    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 637,325    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1984    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,457,763    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 637,325    
Operating Properties [Member] | 10349-10357 West 70th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eden Prairie, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 275,903    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,481,666    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 675,480    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 270,584    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,162,465    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,433,049    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,345,212    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,433,049    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,345,212    
Operating Properties [Member] | 10365-10375 West 70th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eden Prairie, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 291,077    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,618,194    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 629,305    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 285,464    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,253,112    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,538,576    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,378,360    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,538,576    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,378,360    
Operating Properties [Member] | 10393-10394 West 70th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eden Prairie, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 269,618    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,423,318    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 877,174    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 264,419    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,305,691    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,570,110    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,257,559    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,570,110    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,257,559    
Operating Properties [Member] | 10400 Viking Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eden Prairie, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,912,391    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 22,747,046    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,938,372    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 22,721,065    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 25,659,437    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 9,595,577    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 25,659,437    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 9,595,577    
Operating Properties [Member] | 7075 Flying Cloud Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eden Prairie, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 10,232,831    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 10,855,851    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 58,415    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 10,243,977    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,903,119    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 21,147,096    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,863,010    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 21,147,096    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,863,010    
Operating Properties [Member] | 7078 Shady Oak Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eden Prairie, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 343,093    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,085,795    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,500,861    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 336,481    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,593,268    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,929,749    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,838,989    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,929,749    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,838,989    
Operating Properties [Member] | 7615 Smetana Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eden Prairie, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,011,517    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 8,469,751    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,000,555    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,480,713    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,481,268    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,309,902    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,481,268    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,309,902    
Operating Properties [Member] | 7625 Smetana Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eden Prairie, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 4,500,641    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,023,926    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,916,609    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,607,958    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,524,567    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,204,109    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,524,567    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,204,109    
Operating Properties [Member] | 7695-7699 Anagram Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eden Prairie, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 760,525    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,254,758    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 991,584    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 760,525    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,246,342    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,006,867    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,924,564    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,006,867    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,924,564    
Operating Properties [Member] | 7777 Golden Triangle Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eden Prairie, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 993,101    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,136,862    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,151,599    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 993,101    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,288,460    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,281,561    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,272,795    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,281,561    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,272,795    
Operating Properties [Member] | 7800 Equitable Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eden Prairie, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,188,525    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,788,762    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 392,378    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,188,525    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,181,139    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,369,664    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,472,735    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1993    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,369,664    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,472,735    
Operating Properties [Member] | 7905 Fuller Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eden Prairie, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,229,862    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,075,167    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,980,136    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,230,965    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,054,200    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,285,165    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,932,113    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1994    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,285,165    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,932,113    
Operating Properties [Member] | 8855 Columbine Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eden Prairie, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,400,925    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,226,017    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,599,757    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,027,185    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,626,942    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,221,178    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,626,942    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,221,178    
Operating Properties [Member] | 8911 Columbine Road (B2) [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eden Prairie, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 916,687    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,559,577    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,718,407    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,757,857    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,476,264    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 844,041    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,476,264    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 844,041    
Operating Properties [Member] | 8937 Columbine Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eden Prairie, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,325,829    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,385,490    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,739,966    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,971,353    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,711,319    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,270,671    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,711,319    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,270,671    
Operating Properties [Member] | 8967 Columbine Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eden Prairie, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,450,000    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,088,618    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,450,000    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,088,618    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,538,618    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,422,640    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,538,618    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,422,640    
Operating Properties [Member] | 8995 Columbine Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eden Prairie, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,087,594    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,850,532    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,055,296    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,882,830    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,938,126    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 998,881    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,938,126    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 998,881    
Operating Properties [Member] | 9023 Columbine Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eden Prairie, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,956,273    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,123,697    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,956,273    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,123,697    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,079,970    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,059,439    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,079,970    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,059,439    
Operating Properties [Member] | 7351 Coca Cola Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Elkridge, MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,897,044    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 7,286,413    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,023,417    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,160,040    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,183,457    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,292,513    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,183,457    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,292,513    
Operating Properties [Member] | 21705-21707 Mississippi Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Elwood, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 10,594,259    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 30,329,802    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 892,439    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 10,594,259    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 31,222,242    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 41,816,501    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,032,198    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 41,816,501    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,032,198    
Operating Properties [Member] | 27143 S Baseline Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Elwood, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 6,022,000    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,612,934    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 191,986    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 6,022,000    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,804,920    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 11,826,920    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 423,122    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 11,826,920    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 423,122    
Operating Properties [Member] | 180 Sheree Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Exton, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,647,861    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 11,334,403    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,676,399    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,649,426    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 14,009,237    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 16,658,663    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,117,837    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 16,658,663    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,117,837    
Operating Properties [Member] | 9601 Cosner Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Fredericksburg, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 475,262    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,917,234    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 242,595    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 475,262    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,159,829    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,635,091    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,926,193    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1995    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,635,091    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,926,193    
Operating Properties [Member] | 200 W Cypress Creek Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Ft. Lauderdale, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,414,989    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,399,738    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 8,597,913    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,414,989    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,997,651    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 14,412,640    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,194,161    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2003    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 14,412,640    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,194,161    
Operating Properties [Member] | 5410 - 5430 Northwest 33rd Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Ft. Lauderdale, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 603,776    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,176,238    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,424,212    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 625,111    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,579,115    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,204,226    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,243,225    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,204,226    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,243,225    
Operating Properties [Member] | 45 Brookfield Oaks Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Greenville, SC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 818,114    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,471,082    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 825,529    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,463,667    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,289,196    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 695,196    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,289,196    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 695,196    
Operating Properties [Member] | 1487 South Highway 101 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Greer, SC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 464,237    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,829,595    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,301,738    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,992,094    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,293,832    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 612,898    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,293,832    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 612,898    
Operating Properties [Member] | 2727 London Grove Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Groveport, OH    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,875,607    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 11,937,935    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 334,714    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,875,607    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 12,272,649    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 14,148,256    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 112,099    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 14,148,256    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 112,099    
Operating Properties [Member] | 11841 Newgate Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hagerstown, MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,356,207    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 30,555,105    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 9,741,685    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 24,169,627    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 33,911,312    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,608,467    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2008    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 33,911,312    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,608,467    
Operating Properties [Member] | 1 Enterprise Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hampton, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 974,675    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,579,869    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,739,690    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 974,675    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,319,559    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,294,234    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,146,481    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1987    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,294,234    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,146,481    
Operating Properties [Member] | 1317 Executive Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hampton, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,650,423    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 7,945,718    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,128,829    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,467,312    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,596,141    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,721,885    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,596,141    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,721,885    
Operating Properties [Member] | 21 Enterprise Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hampton, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 263,668    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 8,167,118    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,136,137    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 265,719    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 9,301,204    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,566,923    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,214,411    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,566,923    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,214,411    
Operating Properties [Member] | 22 Enterprise Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hampton, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,097,368    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,760,778    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,388,402    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,097,368    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,149,180    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,246,548    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,333,063    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,246,548    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,333,063    
Operating Properties [Member] | 5 Manhattan Square [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hampton, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 207,368    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,535,912    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 212,694    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,530,586    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,743,280    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 595,962    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,743,280    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 595,962    
Operating Properties [Member] | 521 Butler Farm Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hampton, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 750,769    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,911,149    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 225,580    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 710,486    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,177,012    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,887,498    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 900,610    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2003    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,887,498    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 900,610    
Operating Properties [Member] | 1560 Hunter Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hanover Park, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,639,734    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 12,310,741    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 578,659    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,639,734    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 12,889,400    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 15,529,134    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 101,393    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 15,529,134    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 101,393    
Operating Properties [Member] | 1575 Hunter Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hanover Park, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,293,284    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 17,235,926    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 752,167    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,293,284    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 17,988,093    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 21,281,377    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 151,165    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 21,281,377    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 151,165    
Operating Properties [Member] | 7361 Coca Cola Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hanover, MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,245,187    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 9,391,010    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,822,710    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,813,487    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 11,636,197    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 986,214    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 11,636,197    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 986,214    
Operating Properties [Member] | 500 McCarthy Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Harrisburg, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 5,194,872    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 19,991,436    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,534,843    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,687,013    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 24,034,138    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 29,721,151    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 6,506,685    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 29,721,151    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 6,506,685    
Operating Properties [Member] | 600 Industrial Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Harrisburg, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 7,743,800    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 29,107,932    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 9,368,557    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 27,483,175    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 36,851,732    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 6,194,273    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 36,851,732    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 6,194,273    
Operating Properties [Member] | 7195 Grayson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Harrisburg, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 464,534    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,066,272    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 129,149    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 464,534    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,195,421    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,659,955    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 46,145    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,659,955    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 46,145    
Operating Properties [Member] | 7253 Grayson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Harrisburg, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 954,130    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 10,585,367    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 280,506    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 954,130    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,865,873    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 11,820,003    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 76,147    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 11,820,003    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 76,147    
Operating Properties [Member] | 12537 Cerise Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hawthorne, CA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,203,194    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,758,809    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 94,181    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,203,194    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,852,990    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,056,184    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 39,989    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,056,184    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 39,989    
Operating Properties [Member] | 1010 Petersburg Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hebron, KY    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 305,471    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,434,505    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 306,564    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 305,471    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,741,069    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,046,540    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 46,358    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,046,540    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 46,358    
Operating Properties [Member] | 785 Lindbergh Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hebron, KY    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 401,410    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,087,899    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 146,729    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 401,410    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,234,628    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,636,038    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 38,908    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,636,038    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 38,908    
Operating Properties [Member] | 805 Lindbergh Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hebron, KY    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 292,096    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,502,486    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 156,556    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 292,096    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,659,041    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,951,137    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 25,212    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,951,137    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 25,212    
Operating Properties [Member] | 825 Lindbergh Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hebron, KY    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 370,149    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,095,116    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 198,440    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 370,149    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,293,557    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,663,706    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 41,428    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,663,706    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 41,428    
Operating Properties [Member] | 845 Lindbergh Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hebron, KY    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 444,318    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,811,889    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 213,437    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 444,318    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,025,326    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,469,644    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 44,027    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,469,644    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 44,027    
Operating Properties [Member] | 1498 Eagle Hill Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property High Point, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 94,274    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 6,219,495    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 791,880    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,521,889    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,313,769    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,004,621    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,313,769    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,004,621    
Operating Properties [Member] | 4183 Eagle Hill Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property High Point, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 122,203    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,259,320    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 526,266    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,855,257    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,381,523    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 978,595    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,381,523    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 978,595    
Operating Properties [Member] | 4189 Eagle Hill Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property High Point, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 100,106    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,595,213    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 431,106    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,264,213    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,695,319    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,228,964    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,695,319    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,228,964    
Operating Properties [Member] | 4195 Eagle Hill Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property High Point, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 107,586    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,543,904    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 505,700    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,145,790    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,651,490    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 804,486    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,651,490    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 804,486    
Operating Properties [Member] | 4328, 4336 Federal Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property High Point, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 2,020,222    
Real Estate and Accumulated Depreciation, Initial Cost of Land 521,122    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 7,525,947    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 825,092    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,221,977    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,047,069    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 4,379,264    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1995    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,047,069    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 4,379,264    
Operating Properties [Member] | 4344 Federal Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property High Point, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 484,001    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,848,373    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 173,623    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,158,751    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,332,374    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,489,961    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1996    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,332,374    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,489,961    
Operating Properties [Member] | 4380 Federal Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property High Point, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 282,996    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,160,892    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 283,368    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,160,520    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,443,888    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 914,535    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,443,888    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 914,535    
Operating Properties [Member] | 4388 Federal Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property High Point, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 143,661    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,213,832    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 132,655    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,224,838    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,357,493    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 493,837    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,357,493    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 493,837    
Operating Properties [Member] | 4475 Premier Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property High Point, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 748,693    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 6,805,541    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,525,421    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,028,813    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,554,234    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 826,571    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,554,234    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 826,571    
Operating Properties [Member] | 4500 Green Point Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property High Point, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 230,622    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,434,222    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 231,692    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,433,152    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,664,844    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,236,930    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,664,844    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,236,930    
Operating Properties [Member] | 4501 Green Point Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property High Point, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 319,289    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,156,348    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 320,450    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,155,187    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,475,637    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,466,476    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,475,637    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,466,476    
Operating Properties [Member] | 4523 Green Point Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property High Point, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 234,564    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,324,961    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 235,698    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,323,827    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,559,525    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,819,904    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,559,525    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,819,904    
Operating Properties [Member] | 4524 Green Point Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property High Point, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 182,810    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,756,119    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 183,888    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,755,041    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,938,929    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,503,373    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,938,929    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,503,373    
Operating Properties [Member] | Unit 5 Logix Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hinckley, UK    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 10,547,677    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 29,691,911    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 10,547,677    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 29,691,911    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 40,239,588    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 548,662    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 40,239,588    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 548,662    
Operating Properties [Member] | 1515 6th Street South [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hopkins,MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 813,036    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,503,075    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 361,550    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 813,036    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,864,625    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,677,661    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 27,652    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,677,661    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 27,652    
Operating Properties [Member] | 1600 5th Street South [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hopkins,MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 339,336    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,106,454    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 80,794    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 339,336    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,187,249    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,526,585    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 17,021    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,526,585    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 17,021    
Operating Properties [Member] | 100 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 38,729    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 349,811    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 59,073    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 38,729    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 408,884    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 447,613    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 155,147    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1975    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 447,613    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 155,147    
Operating Properties [Member] | 100 Witmer Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,102,784    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 20,452,861    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,764,784    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 19,790,861    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 23,555,645    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 6,480,136    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1996    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 23,555,645    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 6,480,136    
Operating Properties [Member] | 100-107 Lakeside Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 239,528    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,163,498    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 617,512    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 255,528    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,765,010    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,020,538    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,042,612    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1982    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,020,538    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,042,612    
Operating Properties [Member] | 101 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 651,990    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,888,989    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,069,897    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 732,552    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,878,324    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,610,876    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,284,305    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1977    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,610,876    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,284,305    
Operating Properties [Member] | 101-111 Rock Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 350,561    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,166,389    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,163,717    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 452,251    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,228,416    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,680,667    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,871,431    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1975    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,680,667    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,871,431    
Operating Properties [Member] | 102 Rock Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,110,209    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,301,302    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,203,842    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,185,635    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,429,717    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,615,352    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,132,494    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,615,352    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,132,494    
Operating Properties [Member] | 103-109 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 270,906    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,448,500    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 362,165    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 270,906    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,810,664    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,081,570    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,188,356    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1978    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,081,570    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,188,356    
Operating Properties [Member] | 104 Witmer Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,248,148    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 593,447    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 189,793    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,651,802    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,841,595    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 643,313    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1975    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,841,595    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 643,313    
Operating Properties [Member] | 110 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 673,041    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,776,369    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,969,345    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 673,041    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,745,714    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,418,755    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,132,658    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1979    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,418,755    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,132,658    
Operating Properties [Member] | 111-159 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 489,032    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,126,151    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,235,014    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 489,032    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,361,165    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,850,197    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,365,400    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1981    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,850,197    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,365,400    
Operating Properties [Member] | 113-123 Rock Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 351,072    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,171,001    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 708,270    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 451,731    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,778,612    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,230,343    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,601,594    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1975    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,230,343    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,601,594    
Operating Properties [Member] | 123-135 Rock Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 292,360    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,411,677    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,125,649    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 393,019    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,436,667    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,829,686    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,769,955    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1975    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,829,686    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,769,955    
Operating Properties [Member] | 132 Welsh Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,333,642    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,752,651    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,408,041    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,678,252    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,086,293    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,523,111    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,086,293    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,523,111    
Operating Properties [Member] | 161-175 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 294,673    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,663,722    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 957,148    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 294,673    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,620,870    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,915,543    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,559,023    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1976    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,915,543    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,559,023    
Operating Properties [Member] | 181-187 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 360,549    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,259,984    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 787,154    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 360,549    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,047,138    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,407,687    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,849,809    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1982    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,407,687    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,849,809    
Operating Properties [Member] | 2 Walnut Grove Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,281,870    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,767,374    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,442,612    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,265,363    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 9,226,493    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 10,491,856    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 4,013,758    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 10,491,856    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 4,013,758    
Operating Properties [Member] | 200 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 638,513    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,811,323    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,991,542    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 638,513    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,802,865    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,441,378    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,237,354    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,441,378    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,237,354    
Operating Properties [Member] | 200-264 Lakeside Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 502,705    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,540,597    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,291,981    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 502,705    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,832,578    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,335,283    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,696,472    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1982    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,335,283    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,696,472    
Operating Properties [Member] | 201 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 380,127    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,433,433    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,324,673    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 380,802    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,757,431    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,138,233    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,311,095    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1983    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,138,233    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,311,095    
Operating Properties [Member] | 210-223 Witmer Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 270,282    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,441,276    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,962,945    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 270,282    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,404,221    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,674,503    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,766,596    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1972    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,674,503    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,766,596    
Operating Properties [Member] | 220 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 629,944    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,733,228    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,333,679    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 629,944    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,066,907    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,696,851    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,822,143    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,696,851    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,822,143    
Operating Properties [Member] | 231-237 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 436,952    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,948,963    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,068,263    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 436,952    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,017,226    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,454,178    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,096,540    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1981    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,454,178    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,096,540    
Operating Properties [Member] | 240 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 629,944    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,733,234    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,804,045    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 629,944    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,537,279    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,167,223    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,637,398    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,167,223    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,637,398    
Operating Properties [Member] | 255 Business Center Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,154,289    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,007,214    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 770,989    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,140,597    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,791,895    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,932,492    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 888,099    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2003    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,932,492    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 888,099    
Operating Properties [Member] | 261-283 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 464,871    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,951,972    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,781,425    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 464,871    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,733,397    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,198,268    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,402,519    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1978    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,198,268    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,402,519    
Operating Properties [Member] | 300 Welsh Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 696,061    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,339,991    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 640,370    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 696,061    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,980,360    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,676,421    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,715,407    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,676,421    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,715,407    
Operating Properties [Member] | 300 Welsh Road - Building 3 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 180,459    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,441,473    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 633,163    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 180,459    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,074,635    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,255,094    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 843,190    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1983    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,255,094    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 843,190    
Operating Properties [Member] | 300 Welsh Road - Building 4 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 282,493    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,256,508    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,780,163    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 282,493    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,036,671    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,319,164    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,761,750    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1983    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,319,164    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,761,750    
Operating Properties [Member] | 300-309 Lakeside Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 369,475    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,338,761    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,832,004    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 376,475    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,163,765    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,540,240    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,556,952    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1982    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,540,240    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,556,952    
Operating Properties [Member] | 355 Business Center Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 483,045    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 898,798    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 544,472    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 471,171    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,455,144    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,926,315    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 546,069    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2003    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,926,315    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 546,069    
Operating Properties [Member] | 4 Walnut Grove [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,515,115    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 10,809,109    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,515,115    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,809,109    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 13,324,224    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 4,516,707    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 13,324,224    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 4,516,707    
Operating Properties [Member] | 400-445 Lakeside Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 543,628    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,910,226    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,440,949    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 583,628    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,311,175    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,894,803    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,193,874    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1981    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,894,803    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,193,874    
Operating Properties [Member] | 455 Business Center Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,351,011    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,503,449    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,907,857    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,322,317    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,440,000    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,762,317    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,268,213    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2003    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,762,317    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,268,213    
Operating Properties [Member] | 5 Walnut Grove Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,065,951    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 10,625,374    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,939,712    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 9,751,613    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 11,691,325    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,498,803    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 11,691,325    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,498,803    
Operating Properties [Member] | 506 Prudential Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 208,140    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 895,470    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 894,621    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 208,140    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,790,091    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,998,231    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 802,323    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1973    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,998,231    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 802,323    
Operating Properties [Member] | 555 Business Center Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 727,420    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,353,650    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 883,754    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 709,967    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,254,858    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,964,825    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 464,979    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2003    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,964,825    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 464,979    
Operating Properties [Member] | 680 Blair Mill Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,527,151    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 17,475,489    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,138,577    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 16,864,063    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 21,002,640    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 5,312,518    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 21,002,640    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 5,312,518    
Operating Properties [Member] | 7 Walnut Grove Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,631,696    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 18,432,489    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,631,956    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 18,432,229    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 21,064,185    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,968,622    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 21,064,185    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,968,622    
Operating Properties [Member] | 700 Dresher Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,551,777    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,020,638    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,866,350    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,565,140    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,873,625    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,438,765    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,331,100    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1987    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,438,765    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,331,100    
Operating Properties [Member] | 507 Prudential Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 644,900    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,804,100    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 8,408,030    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,131,380    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 13,725,650    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 14,857,030    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 6,360,060    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 14,857,030    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 6,360,060    
Operating Properties [Member] | 747 Dresher Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,607,238    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,032,964    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,607,977    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,032,225    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,640,202    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,984,537    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,640,202    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,984,537    
Operating Properties [Member] | 767 Electronic Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,229,685    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,436,397    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,241,970    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,424,112    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,666,082    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,318,586    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1996    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,666,082    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,318,586    
Operating Properties [Member] | 10301 Round Up Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 545,501    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,927,700    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 599,143    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 545,501    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,526,842    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,072,343    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 217,921    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2010    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,072,343    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 217,921    
Operating Properties [Member] | 10305 Round Up Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,340,609    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,489,720    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,381,308    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,340,609    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,871,027    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 12,211,636    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 899,234    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2010    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 12,211,636    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 899,234    
Operating Properties [Member] | 10607 Haddington Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 201,469    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,631,561    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 104,388    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 201,469    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,735,950    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,937,419    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 14,698    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,937,419    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 14,698    
Operating Properties [Member] | 10735 West Little York Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,110,988    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,351,946    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,271,088    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,135,483    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,598,539    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,734,022    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,297,741    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,734,022    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,297,741    
Operating Properties [Member] | 10739 West Little York Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 797,931    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,950,894    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 400,330    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 799,560    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,349,595    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,149,155    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,799,185    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,149,155    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,799,185    
Operating Properties [Member] | 11201 Greens Crossing Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,006,194    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,412,584    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,777,537    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,008,542    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,187,773    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,196,315    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,677,006    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,196,315    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,677,006    
Operating Properties [Member] | 11502 South Main Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 588,865    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,479,264    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 186,713    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 588,865    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,665,977    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,254,842    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 46,550    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,254,842    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 46,550    
Operating Properties [Member] | 1283 N Post Oak Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 80,730    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 870,656    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 40,876    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 80,730    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 911,532    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 992,262    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 6,872    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 992,262    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 6,872    
Operating Properties [Member] | 1287 N Post Oak Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 146,654    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,620,780    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 59,710    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 146,654    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,680,489    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,827,143    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 16,877    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,827,143    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 16,877    
Operating Properties [Member] | 1291 N Post Oak Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 510,102    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,129,042    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 217,109    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 510,102    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,346,151    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,856,253    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 54,758    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,856,253    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 54,758    
Operating Properties [Member] | 1416 N Sam Houston Parkway E [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 218,850    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,639,902    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 90,023    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 218,850    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,729,924    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,948,774    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 14,111    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,948,774    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 14,111    
Operating Properties [Member] | 1420 N Sam Houston Parkway E [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 211,279    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,554,156    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 107,515    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 211,279    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,661,671    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,872,950    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 14,273    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,872,950    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 14,273    
Operating Properties [Member] | 14200 Hollister Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,396,794    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,855,857    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,699,632    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,553,019    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,252,651    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 189,974    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,252,651    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 189,974    
Operating Properties [Member] | 1424 N Sam Houston Parkway E [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 283,107    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,077,323    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 145,748    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 283,107    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,223,071    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,506,178    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 19,688    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,506,178    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 19,688    
Operating Properties [Member] | 1428 N Sam Houston Parkway E [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 367,446    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,952,453    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 102,727    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 367,446    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,055,179    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,422,625    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 20,402    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,422,625    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 20,402    
Operating Properties [Member] | 16405 Air Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 438,853    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,030,396    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 515,937    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 438,853    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,546,333    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,985,186    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,493,111    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,985,186    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,493,111    
Operating Properties [Member] | 16420 West Hardy Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 529,876    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,267,872    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 118,332    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 529,876    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,386,204    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,916,080    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 35,961    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,916,080    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 35,961    
Operating Properties [Member] | 16445 Air Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 363,339    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,509,186    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 266,552    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 363,339    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,775,738    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,139,077    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,117,896    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,139,077    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,117,896    
Operating Properties [Member] | 1646 Rankin Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 329,961    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,210,202    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 592,234    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,947,929    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,540,163    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,300,632    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,540,163    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,300,632    
Operating Properties [Member] | 1655 Townhurst Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 197,226    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 935,036    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 87,883    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 197,226    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,022,919    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,220,145    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 9,400    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,220,145    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 9,400    
Operating Properties [Member] | 16580 Air Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 289,000    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,559,857    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,290,182    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 289,000    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,850,040    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,139,040    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,462,889    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,139,040    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,462,889    
Operating Properties [Member] | 16602 Central Green Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 284,403    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,953,014    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 503,779    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,733,638    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,237,417    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 908,865    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,237,417    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 908,865    
Operating Properties [Member] | 16605 Air Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 298,999    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,417,513    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 496,186    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,220,326    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,716,512    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 927,143    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,716,512    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 927,143    
Operating Properties [Member] | 1665 Townhurst Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 452,439    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,016,585    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 57,074    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 452,439    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,073,658    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,526,097    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 15,817    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,526,097    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 15,817    
Operating Properties [Member] | 16680 Central Green Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 311,952    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,165,907    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 492,869    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,984,990    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,477,859    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 863,414    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,477,859    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 863,414    
Operating Properties [Member] | 16685 Air Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 414,691    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,459,338    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 414,691    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,459,338    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,874,029    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 576,093    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,874,029    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 576,093    
Operating Properties [Member] | 1755 Trans Central Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 293,534    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,036,269    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 518,093    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 306,147    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,541,749    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,847,896    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,107,572    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,847,896    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,107,572    
Operating Properties [Member] | 4301 S Pinemont Dr [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 226,973    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,174,979    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 46,852    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 226,973    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,221,831    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,448,804    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 21,677    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,448,804    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 21,677    
Operating Properties [Member] | 4401 S Pinemont Dr [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 244,240    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,412,622    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 35,635    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 244,240    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,448,257    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,692,497    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 23,544    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,692,497    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 23,544    
Operating Properties [Member] | 4501 S Pinemont Dr [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 252,907    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,504,053    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 52,253    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 252,907    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,556,306    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,809,213    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 25,380    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,809,213    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 25,380    
Operating Properties [Member] | 5200 N. Sam Houston Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,519,458    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,135,548    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,654,765    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,520,074    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,789,697    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 12,309,771    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,170,043    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 12,309,771    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,170,043    
Operating Properties [Member] | 5250 N. Sam Houston Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,173,287    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 8,868,256    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,748,599    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,173,942    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 11,616,200    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 13,790,142    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,974,496    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 13,790,142    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,974,496    
Operating Properties [Member] | 850 Greens Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,893,405    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 11,593,197    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,894,626    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,899,861    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 14,481,366    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 17,381,227    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,345,024    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 17,381,227    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,345,024    
Operating Properties [Member] | 860 Greens Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,399,365    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,344,650    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,579,558    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,374,012    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,949,561    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,323,573    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,285,909    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,323,573    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,285,909    
Operating Properties [Member] | 8801 A-E Wallisville Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 444,205    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,340,333    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 108,163    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 444,205    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,448,496    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,892,701    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 22,120    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,892,701    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 22,120    
Operating Properties [Member] | 8801-19 & 8821-49 Fallbrook Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,290,001    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 15,297,141    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,867,404    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,290,002    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 17,164,544    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 19,454,546    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 4,657,668    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 19,454,546    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 4,657,668    
Operating Properties [Member] | 8802-8824 Fallbrook Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,774,995    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,364,767    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,362,915    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,775,021    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,727,655    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 10,502,676    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,101,491    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 10,502,676    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,101,491    
Operating Properties [Member] | 8811 A-E Wallisville Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 373,412    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,963,599    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 96,907    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 373,412    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,060,506    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,433,918    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 20,969    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,433,918    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 20,969    
Operating Properties [Member] | 8825-8839 N Sam Houston Pkwy [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 638,453    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,258,815    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 650,142    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 638,477    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,908,932    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,547,409    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 958,990    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,547,409    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 958,990    
Operating Properties [Member] | 8850-8872 Fallbrook Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 504,317    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,878,351    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,054,230    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 504,341    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,932,557    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,436,898    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,303,330    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,436,898    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,303,330    
Operating Properties [Member] | 9500-9540 Clay Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,412,849    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,279,448    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 336,295    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,412,849    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,615,743    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,028,592    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 63,534    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,028,592    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 63,534    
Operating Properties [Member] | 151 South Warner Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,218,086    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,937,866    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 7,192,372    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,187,900    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 14,160,424    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 15,348,324    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,183,117    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1980    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 15,348,324    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,183,117    
Operating Properties [Member] | 180 South Warner Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 995,393    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 8,754,035    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 9,749,428    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,749,428    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 870,655    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2009    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,749,428    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 870,655    
Operating Properties [Member] | 2100 Renaissance Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,110,111    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 12,098,486    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,132,519    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 12,076,078    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 13,208,597    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,702,844    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 13,208,597    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,702,844    
Operating Properties [Member] | 2201 Renaissance Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,370,895    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 15,284,223    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,413,514    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 15,241,604    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 17,655,118    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 5,481,014    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 17,655,118    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 5,481,014    
Operating Properties [Member] | 2300 Renaissance Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA [1]    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 509,580    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,050,939    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 574,152    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,986,367    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,560,519    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,444,383    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,560,519    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,444,383    
Operating Properties [Member] | 2301 Renaissance Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,645,246    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 30,080,438    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,581,649    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 27,144,035    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 31,725,684    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 10,059,898    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 31,725,684    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 10,059,898    
Operating Properties [Member] | 2500 Renaissance Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 509,580    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,662,758    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 592,886    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,579,452    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,172,338    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,140,031    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,172,338    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,140,031    
Operating Properties [Member] | 2520 Renaissance Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,020,000    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,622,740    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 978,402    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,664,338    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,642,740    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,198,388    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,642,740    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,198,388    
Operating Properties [Member] | 2560 Renaissance Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 607,210    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,122,044    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 649,792    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,079,462    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,729,254    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,358,606    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,729,254    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,358,606    
Operating Properties [Member] | 2700 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 764,370    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,643,566    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 867,815    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,540,121    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,407,936    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,525,767    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,407,936    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,525,767    
Operating Properties [Member] | 2900 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 679,440    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,503,074    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 774,096    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,408,418    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,182,514    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,519,241    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,182,514    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,519,241    
Operating Properties [Member] | 3200 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 928,637    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 6,272,635    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,210,137    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,991,135    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,201,272    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,268,296    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1996    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,201,272    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,268,296    
Operating Properties [Member] | 3400 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 776,496    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,139,068    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,537,958    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 776,496    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,677,025    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,453,521    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,765,636    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1995    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,453,521    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,765,636    
Operating Properties [Member] | 3600 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 236,432    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,856,252    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 743,039    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 236,432    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,599,291    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,835,723    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,034,493    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,835,723    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,034,493    
Operating Properties [Member] | 3602 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 217,734    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,759,489    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 385,029    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 217,809    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,144,443    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,362,252    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 888,596    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,362,252    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 888,596    
Operating Properties [Member] | 3604 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 397,178    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,836,269    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 350,874    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,882,573    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,233,447    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 771,370    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,233,447    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 771,370    
Operating Properties [Member] | 440 East Swedesford Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 717,001    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,816,121    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,824,138    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 717,001    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,640,259    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,357,260    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,604,214    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,357,260    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,604,214    
Operating Properties [Member] | 460 East Swedesford Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 705,317    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,737,487    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,083,817    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 705,317    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,821,304    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,526,621    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,708,707    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,526,621    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,708,707    
Operating Properties [Member] | 650 Swedesford Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 952,911    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,722,830    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 8,139,683    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 952,911    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 14,862,513    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 15,815,424    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 6,614,425    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1971    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 15,815,424    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 6,614,425    
Operating Properties [Member] | 680 Swedesford Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 952,361    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,722,830    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 7,217,277    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 952,361    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 13,940,107    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 14,892,468    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 6,234,016    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1971    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 14,892,468    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 6,234,016    
Operating Properties [Member] | 170 South Warner Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 547,800    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,137,400    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,421,277    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 458,232    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,648,245    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,106,477    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,809,789    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1980    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,106,477    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,809,789    
Operating Properties [Member] | 190 South Warner Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 552,200    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,162,600    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,063,496    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 461,909    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,316,387    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,778,296    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,112,178    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1980    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,778,296    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,112,178    
Operating Properties [Member] | 3000 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,191,449    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,476,299    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 946,703    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,721,045    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,667,748    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,038,239    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,667,748    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,038,239    
Operating Properties [Member] | 3100 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 601,956    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,192,852    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 611,436    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,183,372    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,794,808    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 847,707    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1995    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,794,808    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 847,707    
Operating Properties [Member] | 3500 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property King of Prussia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,204,839    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,830,072    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,223,875    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,811,036    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,034,911    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,200,183    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1996    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,034,911    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,200,183    
Operating Properties [Member] | 1700 Interstate Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Lakeland, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 650,000    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,444,220    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 650,000    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,444,220    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,094,220    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 164,953    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,094,220    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 164,953    
Operating Properties [Member] | 5801 Columbia Park Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Landover,MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,187,620    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,598,346    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 182,789    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,187,620    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,781,135    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,968,755    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 38,810    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,968,755    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 38,810    
Operating Properties [Member] | 11425 State Highway 225 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property LaPorte, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 975,974    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,409,036    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 8,957    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 977,542    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,416,424    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,393,966    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 714,598    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,393,966    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 714,598    
Operating Properties [Member] | 11503 State Highway 225 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property LaPorte, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,561,931    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 9,695,493    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 237,274    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,566,047    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 9,928,651    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 12,494,698    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,945,902    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 12,494,698    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,945,902    
Operating Properties [Member] | 640 S State Road 39 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Lebanon,IN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,612,787    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 18,065,552    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,213,251    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,612,787    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 19,278,803    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 20,891,590    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 168,035    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 20,891,590    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 168,035    
Operating Properties [Member] | 7528 Walker Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Lehigh, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 893,441    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,510,457    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 779,330    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,624,568    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,403,898    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,613,828    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,403,898    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,613,828    
Operating Properties [Member] | 8301 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Lehigh, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 11,249,550    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 45,365,956    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 11,254,716    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 45,360,790    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 56,615,506    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 9,145,860    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 56,615,506    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 9,145,860    
Operating Properties [Member] | 8500 Willard Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Lehigh, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 2,620,462    
Real Estate and Accumulated Depreciation, Initial Cost of Land 6,398,815    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 21,851,472    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 7,734,826    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 20,515,461    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 28,250,287    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,041,960    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 28,250,287    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,041,960    
Operating Properties [Member] | 875 Maxham Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Lithia Springs, GA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 445,493    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 10,160,616    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 558,420    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 445,493    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,719,036    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 11,164,529    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 86,272    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 11,164,529    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 86,272    
Operating Properties [Member] | 2145 Center Square Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Logan Township, NJ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 817,326    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,466,668    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 310,105    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 817,326    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,776,773    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,594,099    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 81,911    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,594,099    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 81,911    
Operating Properties [Member] | 7533 Industrial Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Lower Macungie, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 5,603,460    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 18,807,987    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,434,039    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,603,460    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 21,242,026    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 26,845,486    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,045,508    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 26,845,486    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,045,508    
Operating Properties [Member] | 1901 Summit Tower Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Maitland, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 6,078,791    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 12,348,567    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,053,578    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 6,083,206    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 14,397,731    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 20,480,937    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 6,291,291    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 20,480,937    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 6,291,291    
Operating Properties [Member] | 1 Country View Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 400,000    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,600,000    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 6,360,798    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 406,421    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 9,954,377    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 10,360,798    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,704,662    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1982    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 10,360,798    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,704,662    
Operating Properties [Member] | 1 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 419,460    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,792,570    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,350,316    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 419,460    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,142,886    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,562,346    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,928,648    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1982    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,562,346    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,928,648    
Operating Properties [Member] | 10 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 823,540    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,341,376    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 459,973    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 832,244    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,792,645    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,624,889    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 590,788    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2003    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,624,889    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 590,788    
Operating Properties [Member] | 100 Chesterfield Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,320,625    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 7,321,902    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,965,944    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,676,583    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,642,527    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,366,709    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,642,527    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,366,709    
Operating Properties [Member] | 1001 Cedar Hollow Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,436,814    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 16,163,891    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,676,470    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 15,924,235    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 17,600,705    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 7,708,864    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 17,600,705    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 7,708,864    
Operating Properties [Member] | 11 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 496,297    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,960,712    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 708,331    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,748,678    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,457,009    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 887,432    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,457,009    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 887,432    
Operating Properties [Member] | 11,15 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,837,050    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 14,960,110    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,837,878    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 14,959,282    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 16,797,160    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 11,580,321    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1986    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 16,797,160    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 11,580,321    
Operating Properties [Member] | 18 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 394,036    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,976,221    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 68,969    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 397,293    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,041,933    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,439,226    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,503,167    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1980    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,439,226    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,503,167    
Operating Properties [Member] | 2 West Liberty Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 5,405,041    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 11,903,540    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,405,042    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 11,903,539    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 17,308,581    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,157,412    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2003    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 17,308,581    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,157,412    
Operating Properties [Member] | 200 Chesterfield Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 495,893    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,739,093    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 641,555    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 807,638    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,068,903    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,876,541    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,401,423    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,876,541    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,401,423    
Operating Properties [Member] | 27-43 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 448,775    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,347,289    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 449,447    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,346,617    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,796,064    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,820,823    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1977    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,796,064    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,820,823    
Operating Properties [Member] | 3 Country View Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 814,278    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,142,433    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,128,881    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,827,830    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,956,711    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,868,164    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,956,711    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,868,164    
Operating Properties [Member] | 375 Technology Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 191,114    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,625,516    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 234,922    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,581,708    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,816,630    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 641,806    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,816,630    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 641,806    
Operating Properties [Member] | 40 Liberty Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 4,241,137    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 17,737,090    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,904,729    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,241,168    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 20,641,787    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 24,882,955    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 8,383,098    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 24,882,955    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 8,383,098    
Operating Properties [Member] | 425 Technology Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 191,114    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,700,603    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 321,473    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,570,244    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,891,717    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 654,666    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,891,717    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 654,666    
Operating Properties [Member] | 45 Liberty Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 4,380,221    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 15,322,821    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,749,748    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 14,953,294    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 19,703,042    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 7,245,970    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 19,703,042    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 7,245,970    
Operating Properties [Member] | 45-67 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 795,143    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,331,125    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 795,831    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,330,437    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,126,268    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,927,317    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1974    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,126,268    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,927,317    
Operating Properties [Member] | 5 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 684,200    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,181,661    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,652,942    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 684,200    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,834,603    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,518,803    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,356,876    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1983    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,518,803    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,356,876    
Operating Properties [Member] | 50 Morehall Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 849,576    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 13,104,302    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,337,076    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 12,616,802    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 13,953,878    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 6,568,093    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 13,953,878    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 6,568,093    
Operating Properties [Member] | 600 Chesterfield Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,013,750    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 9,074,858    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,784,282    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,304,326    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 11,088,608    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,957,954    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 11,088,608    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,957,954    
Operating Properties [Member] | 700 Chesterfield Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,013,750    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 8,829,877    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,771,540    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,072,087    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 10,843,627    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,926,051    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 10,843,627    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,926,051    
Operating Properties [Member] | 10 Valley Stream Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 509,075    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,726,213    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 509,899    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,725,389    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,235,288    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,789,979    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1984    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,235,288    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,789,979    
Operating Properties [Member] | 10, 20 Liberty Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 724,058    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,827,720    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 724,846    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,826,932    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,551,778    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,506,696    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,551,778    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,506,696    
Operating Properties [Member] | 12,14,16 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 130,689    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,326,294    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 128,767    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,328,216    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,456,983    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 910,800    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1982    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,456,983    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 910,800    
Operating Properties [Member] | 14 Lee Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 664,282    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,569,322    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 643,892    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,589,712    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,233,604    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,657,798    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,233,604    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,657,798    
Operating Properties [Member] | 155 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 625,147    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,640,082    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 626,068    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,639,161    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,265,229    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,954,876    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1981    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,265,229    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,954,876    
Operating Properties [Member] | 20 Valley Stream Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 465,539    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 6,062,255    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 466,413    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,061,381    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,527,794    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,436,599    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1987    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,527,794    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,436,599    
Operating Properties [Member] | 257-275 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 504,611    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,086,503    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 505,458    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,085,656    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,591,114    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,457,782    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1983    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,591,114    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,457,782    
Operating Properties [Member] | 277-293 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 530,729    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,268,833    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 531,534    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,268,028    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,799,562    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,616,657    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1984    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,799,562    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,616,657    
Operating Properties [Member] | 30 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 128,126    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 554,378    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 128,783    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 553,721    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 682,504    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 372,198    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1975    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 682,504    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 372,198    
Operating Properties [Member] | 300-400 Chesterfield Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 937,212    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,607,142    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,393,919    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,150,435    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,544,354    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,944,236    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,544,354    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,944,236    
Operating Properties [Member] | 311 Technology Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 397,131    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,713,845    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 397,948    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,713,028    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,110,976    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,805,580    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1984    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,110,976    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,805,580    
Operating Properties [Member] | 333 Phoenixville Pike [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 523,530    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,708,843    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 524,230    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,708,143    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,232,373    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,286,593    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,232,373    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,286,593    
Operating Properties [Member] | 40 Valley Stream Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 322,918    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,315,958    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 325,775    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,313,101    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,638,876    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,534,806    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1987    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,638,876    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,534,806    
Operating Properties [Member] | 420 Lapp Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,054,418    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 8,850,116    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,055,243    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,849,291    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,904,534    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 4,249,871    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,904,534    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 4,249,871    
Operating Properties [Member] | 5 Country View Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 785,168    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,678,632    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 226,536    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 786,235    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,904,101    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,690,336    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,231,504    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,690,336    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,231,504    
Operating Properties [Member] | 50 Valley Stream Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 323,971    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,434,613    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 323,792    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,434,792    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,758,584    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,538,462    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1987    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,758,584    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,538,462    
Operating Properties [Member] | 500 Chesterfield Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 472,364    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,156,878    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 756,847    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,872,395    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,629,242    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,675,028    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,629,242    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,675,028    
Operating Properties [Member] | 508 Lapp Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 331,392    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,713,394    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 332,216    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,712,570    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,044,786    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,248,445    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1984    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,044,786    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,248,445    
Operating Properties [Member] | 510 Lapp Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 356,950    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 926,587    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 357,751    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 925,786    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,283,537    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 723,943    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1983    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,283,537    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 723,943    
Operating Properties [Member] | 55 Valley Stream Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 215,005    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,094,361    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 215,818    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,093,548    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,309,366    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,874,838    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1983    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,309,366    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,874,838    
Operating Properties [Member] | 60 Morehall Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 865,424    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 9,285,000    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,182,805    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 884,974    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 14,448,255    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 15,333,229    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 9,061,777    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 15,333,229    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 9,061,777    
Operating Properties [Member] | 65 Valley Stream Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 381,544    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 6,785,626    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 382,361    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,784,809    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,167,170    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 4,999,023    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1983    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,167,170    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 4,999,023    
Operating Properties [Member] | 7 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 176,435    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 6,593,330    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 177,317    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,592,448    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,769,765    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,104,195    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,769,765    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,104,195    
Operating Properties [Member] | 75 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 143,074    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 618,372    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 143,811    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 617,635    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 761,446    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 505,537    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1977    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 761,446    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 505,537    
Operating Properties [Member] | 77-123 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 887,664    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,232,375    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 888,359    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,231,680    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,120,039    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,789,228    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1978    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,120,039    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,789,228    
Operating Properties [Member] | 1169 Canton Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Marietta, GA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,232,219    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 17,897,326    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 435,643    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,232,219    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 18,332,969    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 19,565,188    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 130,432    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 19,565,188    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 130,432    
Operating Properties [Member] | 65 Brookfield Oaks Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Mauldin, SC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 557,174    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,842,439    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 506,318    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,893,295    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,399,613    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 603,024    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,399,613    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 603,024    
Operating Properties [Member] | 75 Brookfield Oaks Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Mauldin, SC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 419,731    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,332,292    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 430,909    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,321,114    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,752,023    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 565,611    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2003    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,752,023    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 565,611    
Operating Properties [Member] | 126-132 Liberty Industrial Pkw [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property McDonough, GA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 600,666    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,184,131    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 480,533    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 600,666    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,664,663    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,265,329    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 72,925    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,265,329    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 72,925    
Operating Properties [Member] | 95-115 Liberty Industrial Pkwy [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property McDonough, GA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 660,420    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,785,127    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 526,335    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 660,420    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,311,462    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,971,882    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 61,944    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,971,882    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 61,944    
Operating Properties [Member] | 11401 NW 134th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Medley, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 5,558,619    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 17,678,237    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 730,681    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,558,619    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 18,408,918    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 23,967,537    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 176,279    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 23,967,537    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 176,279    
Operating Properties [Member] | 3824-3960 Crowfarn Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Memphis, TN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 291,223    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,044,953    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 74,204    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 291,223    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,119,156    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,410,379    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 23,364    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,410,379    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 23,364    
Operating Properties [Member] | 4700 Nathan Lane North [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Minneapolis, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,501,308    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 8,446,083    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 13,720,236    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,501,308    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 22,166,319    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 23,667,627    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 4,819,927    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1996    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 23,667,627    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 4,819,927    
Operating Properties [Member] | 12501 & 12701 Whitewater Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Minnetonka, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,175,209    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,948,085    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 8,574,579    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,177,953    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 12,519,920    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 14,697,873    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,604,849    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1986    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 14,697,873    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,604,849    
Operating Properties [Member] | 12800 Whitewater Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Minnetonka, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,273,600    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,158,737    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,082,966    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,273,731    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,241,571    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,515,302    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 240,525    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,515,302    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 240,525    
Operating Properties [Member] | 12900 Whitewater Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Minnetonka, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,236,560    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,762,325    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,023,214    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,236,687    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,785,412    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,022,099    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 212,508    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,022,099    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 212,508    
Operating Properties [Member] | 5400-5500 Feltl Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Minnetonka, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 883,895    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,983,345    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,466,053    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 883,895    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,449,398    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 11,333,293    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 4,538,606    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 11,333,293    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 4,538,606    
Operating Properties [Member] | 6000 Clearwater Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Minnetonka, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 985,016    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,091,371    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,503,007    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 985,117    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,594,277    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,579,394    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 253,018    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,579,394    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 253,018    
Operating Properties [Member] | 456 International Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Minooka, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,862,683    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 14,357,981    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,540    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,862,683    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 14,361,521    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 18,224,204    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,095,591    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 18,224,204    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,095,591    
Operating Properties [Member] | 3100 SW 145th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Miramar, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 6,204,407    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 16,706,567    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 6,265,000    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 16,645,974    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 22,910,974    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,182,874    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 22,910,974    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,182,874    
Operating Properties [Member] | 3350 SW 148th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Miramar, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,960,511    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 18,332,548    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,980,689    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 18,312,370    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 21,293,059    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 7,221,373    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 21,293,059    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 7,221,373    
Operating Properties [Member] | 3400 Lakeside Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Miramar, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,022,153    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 11,345,881    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,005,331    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,022,153    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 13,351,212    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 15,373,365    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 5,350,136    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 15,373,365    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 5,350,136    
Operating Properties [Member] | 3450 Lakeside Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Miramar, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,022,152    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 11,357,143    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,802,516    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,022,152    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 14,159,659    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 16,181,811    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 6,059,965    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 16,181,811    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 6,059,965    
Operating Properties [Member] | 323 Park Knoll Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Morrisville, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 2,614,609    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,071,600    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,397,807    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,022,728    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,071,600    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,420,535    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,492,135    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 683,726    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2010    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,492,135    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 683,726    
Operating Properties [Member] | 324 Park Knoll Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Morrisville, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,449,092    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,424,932    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 305,792    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,449,450    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,730,366    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,179,816    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 850,539    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,179,816    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 850,539    
Operating Properties [Member] | 619 Distribution Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Morrisville, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,031,430    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,655,167    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 341,601    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,031,685    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,996,513    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,028,198    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,075,863    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,028,198    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,075,863    
Operating Properties [Member] | 627 Distribution Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Morrisville, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,061,370    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,152,110    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 600,687    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,061,632    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,752,535    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,814,167    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 953,626    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,814,167    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 953,626    
Operating Properties [Member] | 1879 Lamont Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Odenton, MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,976,000    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 8,099,579    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,469,160    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,011,030    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,533,709    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 12,544,739    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,815,153    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 12,544,739    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,815,153    
Operating Properties [Member] | 350 Winmeyer Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Odenton, MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,778,400    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,289,165    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,069,298    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,809,927    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 9,326,936    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 11,136,863    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,295,694    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 11,136,863    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,295,694    
Operating Properties [Member] | 1000 Gills Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 415,906    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,713,878    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 435,400    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,694,384    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,129,784    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 408,256    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,129,784    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 408,256    
Operating Properties [Member] | 10003 Satellite Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 680,312    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,120,754    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,367,678    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 680,312    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,488,432    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,168,744    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,060,925    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2003    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,168,744    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,060,925    
Operating Properties [Member] | 10511 & 10611 Satellite Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 517,554    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,568,186    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 443,582    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 522,991    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,006,331    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,529,322    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,294,479    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,529,322    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,294,479    
Operating Properties [Member] | 10771 Palm Bay Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 664,605    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,363,613    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 685,383    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,342,835    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,028,218    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 709,672    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,028,218    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 709,672    
Operating Properties [Member] | 1090 Gills Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 878,320    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,558,833    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,401,321    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 878,320    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,960,154    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,838,474    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,039,531    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2003    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,838,474    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,039,531    
Operating Properties [Member] | 1400-1440 Central Florida Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 518,043    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,561,938    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 972,059    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 518,043    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,533,997    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,052,040    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,415,579    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1962    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,052,040    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,415,579    
Operating Properties [Member] | 1902 Cypress Lake Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 523,512    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,191,790    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,501,108    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 538,512    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,677,898    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,216,410    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,811,632    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,216,410    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,811,632    
Operating Properties [Member] | 1950 Summit Park Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,573,700    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 17,478,646    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,366,242    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,583,667    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 20,834,921    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 23,418,588    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 5,598,959    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 23,418,588    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 5,598,959    
Operating Properties [Member] | 1958 Summit Park Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,573,961    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 11,206,937    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 10,302,131    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,583,216    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 21,499,813    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 24,083,029    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 4,753,999    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 24,083,029    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 4,753,999    
Operating Properties [Member] | 201 Summit Park Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 4,435,921    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 38,416,263    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,510,990    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 38,341,194    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 42,852,184    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 4,114,956    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2008    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 42,852,184    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 4,114,956    
Operating Properties [Member] | 2202 Taft-Vineland Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,283,713    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,350,222    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,283,713    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,350,222    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,633,935    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,340,664    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,633,935    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,340,664    
Operating Properties [Member] | 2256 Taft-Vineland Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 467,296    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,494,667    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 825,673    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,136,290    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,961,963    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 577,460    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,961,963    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 577,460    
Operating Properties [Member] | 2351 Investors Row [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,261,924    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,496,249    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,521,108    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,271,785    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,007,496    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 12,279,281    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,442,643    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 12,279,281    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,442,643    
Operating Properties [Member] | 2400 South Lake Orange Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 385,964    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,215,820    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 642,427    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,959,357    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,601,784    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 920,539    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,601,784    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 920,539    
Operating Properties [Member] | 2412 Sand Lake Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,236,819    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,243,314    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,080,993    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,244,667    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,316,459    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,561,126    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 102,027    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,561,126    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 102,027    
Operating Properties [Member] | 2416 Lake Orange Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 535,964    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,707,004    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 704,800    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,538,168    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,242,968    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 836,397    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,242,968    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 836,397    
Operating Properties [Member] | 6200 Lee Vista Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,435,301    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,174,642    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 638,970    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,435,301    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,813,612    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,248,913    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,295,111    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,248,913    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,295,111    
Operating Properties [Member] | 6501 Lee Vista Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 903,701    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,660,760    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 925,671    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,638,790    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,564,461    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,742,041    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,564,461    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,742,041    
Operating Properties [Member] | 6918 Presidents Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 872,550    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,526,043    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 8,631    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 872,550    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,534,674    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,407,224    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 113,853    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,407,224    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 113,853    
Operating Properties [Member] | 6923 Lee Vista Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 903,701    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,790,427    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 830,953    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,863,175    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,694,128    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 871,059    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,694,128    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 871,059    
Operating Properties [Member] | 7022 TPC Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,443,510    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,775,194    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 538,223    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,457,286    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,299,642    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,756,928    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,442,201    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,756,928    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,442,201    
Operating Properties [Member] | 7100 TPC Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,431,489    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 8,002,539    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 793,222    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,445,807    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,781,443    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 10,227,250    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,640,546    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 10,227,250    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,640,546    
Operating Properties [Member] | 7101 TPC Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,553,537    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,702,243    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 329,099    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,570,863    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,014,016    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,584,879    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,154,156    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,584,879    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,154,156    
Operating Properties [Member] | 7315 Kingspointe Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,931,697    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,388,203    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,052,761    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,932,004    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,440,657    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 10,372,661    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,810,050    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 10,372,661    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,810,050    
Operating Properties [Member] | 8201 Chancellor Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 4,295,972    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 15,564,905    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,994,969    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,295,972    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 18,559,875    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 22,855,847    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,178,833    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2010    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 22,855,847    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,178,833    
Operating Properties [Member] | 851 Gills Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 332,992    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,861,135    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 373,500    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,820,627    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,194,127    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 460,129    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,194,127    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 460,129    
Operating Properties [Member] | 950 Gills Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 443,989    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,907,134    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 464,800    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,886,323    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,351,123    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 411,719    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,351,123    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 411,719    
Operating Properties [Member] | 9550 Satellite Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 574,831    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,507,801    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 587,319    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,495,313    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,082,632    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,044,792    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,082,632    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,044,792    
Operating Properties [Member] | 9600 Satellite Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 252,850    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,297,923    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 102,860    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 252,850    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,400,783    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,653,633    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 549,904    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,653,633    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 549,904    
Operating Properties [Member] | 9700 Satellite Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 405,362    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,146,546    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 298,443    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 405,362    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,444,989    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,850,351    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 550,617    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,850,351    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 550,617    
Operating Properties [Member] | 13 Centennial Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Peabody, MA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,203,464    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,752,384    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 489,439    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,203,464    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,241,823    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,445,287    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 111,551    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,445,287    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 111,551    
Operating Properties [Member] | 1 Crescent Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Philadelphia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 567,280    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 15,417,229    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 347,892    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 15,636,617    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 15,984,509    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,015,280    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 15,984,509    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,015,280    
Operating Properties [Member] | 12285 McNulty Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Philadelphia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 532,748    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,126,150    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 152,538    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 532,748    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,278,689    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,811,437    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 35,995    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,811,437    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 35,995    
Operating Properties [Member] | 150 Rouse Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Philadelphia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 567,531    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 13,999,552    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 569,349    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 13,997,734    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 14,567,083    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 496,978    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 14,567,083    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 496,978    
Operating Properties [Member] | 3 Crescent Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Philadelphia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 214,726    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 22,906,987    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 417,823    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 22,703,890    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 23,121,713    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,484,841    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2008    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 23,121,713    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,484,841    
Operating Properties [Member] | 4300 South 26th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Philadelphia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 402,673    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 34,872,598    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 413,030    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 34,862,241    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 35,275,271    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,880,730    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2008    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 35,275,271    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,880,730    
Operating Properties [Member] | 4751 League Island Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Philadelphia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 992,965    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 331,924    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 7,223,254    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,022,081    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,526,062    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,548,143    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,041,669    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2003    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,548,143    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,041,669    
Operating Properties [Member] | 4775 League Island Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Philadelphia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 891,892    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,623,172    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 366,982    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,148,082    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,515,064    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 810,065    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,515,064    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 810,065    
Operating Properties [Member] | 2626 South 7th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Phoenix, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,519,510    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,798,560    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,286,737    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,519,510    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,085,297    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,604,807    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 228,380    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,604,807    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 228,380    
Operating Properties [Member] | 4207 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Phoenix, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,409,908    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,680,808    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,100,202    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,410,248    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,780,670    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,190,918    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,401,486    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,190,918    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,401,486    
Operating Properties [Member] | 4217 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Phoenix, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 6,920,980    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 10,045,599    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,757,067    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 6,690,321    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 14,033,325    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 20,723,646    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,988,108    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 20,723,646    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,988,108    
Operating Properties [Member] | 4303 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Phoenix, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,619,964    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 9,675,711    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 43,651    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,619,964    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 9,719,362    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 12,339,326    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,883,829    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 12,339,326    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,883,829    
Operating Properties [Member] | 4313 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Phoenix, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,895,539    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 16,724,283    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,467,793    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,895,539    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 18,192,076    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 22,087,615    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,801,214    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 22,087,615    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,801,214    
Operating Properties [Member] | 4405 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Phoenix, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,646,318    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 9,697,439    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 825,620    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,646,318    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,523,059    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 13,169,377    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,931,623    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 13,169,377    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,931,623    
Operating Properties [Member] | 4410 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Phoenix, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 4,758,484    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 10,559,563    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,608,207    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,765,172    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 16,161,082    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 20,926,254    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,290,039    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 20,926,254    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,290,039    
Operating Properties [Member] | 4415 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Phoenix, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,749,957    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,667,748    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 465,844    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,749,957    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,133,592    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,883,549    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 786,739    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,883,549    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 786,739    
Operating Properties [Member] | 4425 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Phoenix, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 7,318,457    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 24,549,401    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements (473,426)    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 7,318,457    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 24,075,975    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 31,394,432    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,927,918    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 31,394,432    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,927,918    
Operating Properties [Member] | 4435 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Phoenix, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,910,584    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,954,020    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,166,648    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,911,045    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,120,208    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,031,253    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,040,886    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,031,253    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,040,886    
Operating Properties [Member] | 4610 South 44th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Phoenix, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 6,539,310    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 10,331,533    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 6,827,288    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,043,555    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 16,870,843    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,663,976    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 16,870,843    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,663,976    
Operating Properties [Member] | 4750 S. 44th Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Phoenix, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,756,307    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 8,336,400    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,190,610    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,761,587    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 12,521,730    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 16,283,317    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,136,090    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 16,283,317    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,136,090    
Operating Properties [Member] | 563 South 63rd Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Phoenix, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 5,523,427    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 14,581,705    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 7,876,524    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,636,070    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 22,345,586    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 27,981,656    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 281,487    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 27,981,656    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 281,487    
Operating Properties [Member] | 9801 80th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Pleasant Prairie, WI    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,692,077    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,934,794    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 337,494    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,689,726    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,274,639    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,964,365    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,145,391    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1994    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,964,365    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,145,391    
Operating Properties [Member] | 2250 Hickory Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Plymouth Meeting, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,015,851    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 9,175,555    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,070,214    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,024,040    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 12,237,581    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 13,261,621    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 5,510,733    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 13,261,621    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 5,510,733    
Operating Properties [Member] | 14630-14650 28th Avenue North [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Plymouth, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 198,205    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,793,422    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 733,275    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 198,205    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,526,696    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,724,901    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,167,527    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1978    
Life Used for Depreciation 5 years    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,724,901    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,167,527    
Operating Properties [Member] | 2920 Northwest Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Plymouth, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 392,026    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,433,678    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 434,126    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 384,235    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,875,595    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,259,830    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,549,911    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997    
Life Used for Depreciation 5 years    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,259,830    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,549,911    
Operating Properties [Member] | 1400 SW 6th Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Pompano Beach, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,157,049    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,620,956    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,294,899    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,157,049    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,915,855    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,072,904    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,116,446    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1986    
Life Used for Depreciation 5 years    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,072,904    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,116,446    
Operating Properties [Member] | 1405 SW 6th Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Pompano Beach, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 392,138    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,565,787    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 444,436    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 392,138    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,010,224    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,402,362    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 868,485    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985    
Life Used for Depreciation 5 years    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,402,362    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 868,485    
Operating Properties [Member] | 1500 SW 5th Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Pompano Beach, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 972,232    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,892,085    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 503,712    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 972,232    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,395,797    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,368,029    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,730,940    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1957    
Life Used for Depreciation 5 years    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,368,029    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,730,940    
Operating Properties [Member] | 1501 SW 5th Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Pompano Beach, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 203,247    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 811,093    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 342,376    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 203,247    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,153,470    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,356,717    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 408,458    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990    
Life Used for Depreciation 5 years    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,356,717    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 408,458    
Operating Properties [Member] | 1601 SW 5th Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Pompano Beach, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 203,247    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 811,093    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 78,411    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 203,247    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 889,505    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,092,752    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 345,590    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990    
Life Used for Depreciation 5 years    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,092,752    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 345,590    
Operating Properties [Member] | 1651 SW 5th Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Pompano Beach, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 203,247    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 811,093    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 183,052    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 203,247    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 994,146    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,197,393    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 364,633    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990    
Life Used for Depreciation 5 years    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,197,393    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 364,633    
Operating Properties [Member] | 595 SW 13th Terrace [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Pompano Beach, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 359,933    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,437,116    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 624,145    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 359,933    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,061,261    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,421,194    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 840,297    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1984    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,421,194    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 840,297    
Operating Properties [Member] | 601 SW 13th Terrace [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Pompano Beach, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 164,413    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 655,933    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 279,326    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 164,413    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 935,259    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,099,672    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 434,373    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1984    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,099,672    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 434,373    
Operating Properties [Member] | 605 SW 16th Terrace [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Pompano Beach, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 310,778    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,238,324    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 186,248    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 310,178    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,425,172    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,735,350    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 663,040    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1965    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,735,350    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 663,040    
Operating Properties [Member] | 301 Hill Carter Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 659,456    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,836,010    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 159,898    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 659,456    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,995,908    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,655,364    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,377,111    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,655,364    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,377,111    
Operating Properties [Member] | 4101-4127 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 310,854    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,279,597    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,093,550    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 310,854    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,373,147    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,684,001    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,518,335    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1973    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,684,001    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,518,335    
Operating Properties [Member] | 4201-4261 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 693,203    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,083,493    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,908,968    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 693,203    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,992,461    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,685,664    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,263,202    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1975    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,685,664    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,263,202    
Operating Properties [Member] | 4263-4299 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 256,203    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,549,649    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,159,827    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 256,203    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,709,476    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,965,679    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,057,224    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1976    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,965,679    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,057,224    
Operating Properties [Member] | 4263F-N. Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 91,476    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,760,194    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 91,599    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,760,071    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,851,670    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 789,708    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1975    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,851,670    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 789,708    
Operating Properties [Member] | 4301-4335 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 223,696    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,640,435    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,470,110    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 223,696    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,110,545    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,334,241    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,549,168    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1978    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,334,241    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,549,168    
Operating Properties [Member] | 4337-4379 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 325,303    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,385,557    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,293,892    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 325,303    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,679,449    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,004,752    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,744,383    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1979    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,004,752    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,744,383    
Operating Properties [Member] | 4401-4445 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 615,038    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,510,272    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 443,077    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 615,038    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,953,349    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,568,387    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,314,990    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,568,387    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,314,990    
Operating Properties [Member] | 4447-4491 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 454,056    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,729,742    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 364,252    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 454,056    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,093,994    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,548,050    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,580,731    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1987    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,548,050    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,580,731    
Operating Properties [Member] | 4501-4549 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 486,166    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,565,211    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 553,422    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 486,166    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,118,633    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,604,799    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,882,892    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1981    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,604,799    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,882,892    
Operating Properties [Member] | 4551-4593 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 474,360    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,478,646    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 944,590    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 474,360    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,423,236    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,897,596    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,088,072    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1982    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,897,596    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,088,072    
Operating Properties [Member] | 4601-4643 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 652,455    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,784,675    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 769,136    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 652,455    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,553,811    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,206,266    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,805,560    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,206,266    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,805,560    
Operating Properties [Member] | 4645-4683 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 404,616    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,967,187    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 541,284    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 404,616    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,508,471    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,913,087    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,624,533    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,913,087    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,624,533    
Operating Properties [Member] | 4717-4729 Eubank Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 449,447    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,294,697    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,212,870    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 452,263    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,504,751    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,957,014    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,275,160    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1978    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,957,014    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,275,160    
Operating Properties [Member] | 510 Eastpark Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 261,961    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,110,874    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 470,589    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 262,210    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,581,214    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,843,424    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,206,531    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,843,424    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,206,531    
Operating Properties [Member] | 520 Eastpark Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 486,118    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,083,582    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 698,931    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 486,598    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,782,033    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,268,631    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,931,125    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,268,631    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,931,125    
Operating Properties [Member] | 530 Eastpark Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 266,883    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,582,885    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 334,772    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,514,996    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,849,768    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 994,877    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,849,768    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 994,877    
Operating Properties [Member] | 540 Eastpark Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 742,300    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,415,233    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,066,839    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,090,694    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,157,533    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 751,308    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,157,533    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 751,308    
Operating Properties [Member] | 5600-5626 Eastport Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 489,941    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,592,900    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 536,950    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 489,941    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,129,850    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,619,791    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,787,664    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,619,791    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,787,664    
Operating Properties [Member] | 5601-5659 Eastport Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 705,660    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,769,910    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 720,100    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,755,470    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,475,570    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,165,001    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1996    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,475,570    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,165,001    
Operating Properties [Member] | 5650-5674 Eastport Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 644,384    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,025,480    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 215,069    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 644,384    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,240,549    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,884,933    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,998,249    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,884,933    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,998,249    
Operating Properties [Member] | 5700 Eastport Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 408,729    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,697,348    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 677,432    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 408,729    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,374,780    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,783,509    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,789,346    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,783,509    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,789,346    
Operating Properties [Member] | 5701-5799 Eastport Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 694,644    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,612,200    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 700,503    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,606,341    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,306,844    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,084,265    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,306,844    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,084,265    
Operating Properties [Member] | 5900 Eastport Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 676,661    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,974,338    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 687,898    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,963,101    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,650,999    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,222,816    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,650,999    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,222,816    
Operating Properties [Member] | 6000 Eastport Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 872,901    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 7,486,258    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 901,666    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,457,493    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,359,159    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,083,392    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,359,159    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,083,392    
Operating Properties [Member] | 2020 US Highway 301 South [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Riverview, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,233,639    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 13,608,485    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 109,899    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,233,800    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 13,718,223    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 14,952,023    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,769,053    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 14,952,023    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,769,053    
Operating Properties [Member] | 6530 Judge Adams Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Rock Creek, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 305,821    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,967,815    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 335,061    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,938,575    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,273,636    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,812,271    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,273,636    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,812,271    
Operating Properties [Member] | 6532 Judge Adams Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Rock Creek, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 354,903    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,016,834    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 399,988    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,971,749    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,371,737    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,626,000    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,371,737    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,626,000    
Operating Properties [Member] | 13098 George Weber Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Rogers, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 895,811    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,004,189    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 645,566    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 895,811    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,649,755    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,545,566    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 564,459    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,545,566    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 564,459    
Operating Properties [Member] | 1070 Windham Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Romeoville, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 8,672,143    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 24,144,864    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 8,672,143    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 24,144,864    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 32,817,007    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 840,005    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 32,817,007    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 840,005    
Operating Properties [Member] | 1550 Central Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Roselle, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,884,492    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 10,439,793    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 484,562    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,884,492    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,924,355    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 13,808,847    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 96,728    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 13,808,847    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 96,728    
Operating Properties [Member] | 1135 Aviation Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property San Fernando, CA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,035,034    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,844,962    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 135,218    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,035,034    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,980,180    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,015,214    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 22,470    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,015,214    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 22,470    
Operating Properties [Member] | 8715 Bollman Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Savage, MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,263,237    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,633,210    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 99,509    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,263,237    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,732,719    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,995,956    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 21,816    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,995,956    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 21,816    
Operating Properties [Member] | 8501 East Raintree Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Scottsdale, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 4,076,412    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 27,621,159    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,115,137    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 27,582,434    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 31,697,571    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 7,042,077    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 31,697,571    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 7,042,077    
Operating Properties [Member] | 1150 Gateway Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Shakopee, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,126,865    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,684,178    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,126,865    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,684,178    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,811,043    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 164,890    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,811,043    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 164,890    
Operating Properties [Member] | 5555 12th Avenue East [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Shakopee, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 887,285    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,321,200    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 6,820    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 887,285    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,328,020    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,215,305    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 163,463    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,215,305    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 163,463    
Operating Properties [Member] | 6900 Harbor View Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Suffolk, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 904,052    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 8,652,438    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 807,006    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,749,484    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,556,490    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,719,372    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,556,490    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,719,372    
Operating Properties [Member] | 1301 International Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Sunrise, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 5,100,162    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 24,219,956    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 7,381,868    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,100,791    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 31,601,195    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 36,701,986    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 5,568,038    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 36,701,986    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 5,568,038    
Operating Properties [Member] | 13621 NW 12th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Sunrise, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 5,570,820    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 9,454,900    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,690,353    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,570,820    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 12,145,253    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 17,716,073    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,055,333    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2008    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 17,716,073    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,055,333    
Operating Properties [Member] | 13630 NW 8th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Sunrise, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 659,797    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,596,275    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 540,787    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 659,825    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,137,033    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,796,858    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,145,342    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1991    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,796,858    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,145,342    
Operating Properties [Member] | 13650 NW 8th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Sunrise, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 558,223    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,171,930    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 214,395    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 558,251    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,386,297    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,944,548    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 918,225    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1991    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,944,548    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 918,225    
Operating Properties [Member] | 111 Kelsey Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 359,540    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,461,850    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,266,152    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 359,540    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,728,002    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,087,542    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 899,662    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,087,542    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 899,662    
Operating Properties [Member] | 131 Kelsey Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 511,463    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,437,886    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 559,527    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,389,822    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,949,349    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,452,150    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,949,349    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,452,150    
Operating Properties [Member] | 150-182 Kelsey Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 403,541    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,260,899    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,181,609    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,482,831    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,664,440    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 625,275    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,664,440    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 625,275    
Operating Properties [Member] | 200-34 Kelsey Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 330,097    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,314,788    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 933,362    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,711,523    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,644,885    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 564,239    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,644,885    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 564,239    
Operating Properties [Member] | 3102,3104,3110 Cherry Palm Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 503,767    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,787,585    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,301,589    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 503,767    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,089,174    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,592,941    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,818,822    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1986    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,592,941    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,818,822    
Operating Properties [Member] | 3401-3409 Cragmont Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 556,952    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,849,236    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,141    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 556,952    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,854,377    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,411,329    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 104,522    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,411,329    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 104,522    
Operating Properties [Member] | 3502 Roga Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 201,600    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,263,131    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 21,392    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 201,600    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,284,523    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,486,123    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 35,575    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,486,123    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 35,575    
Operating Properties [Member] | 3505 Cragmont Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 936,336    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,155,520    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,313    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 936,336    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,156,833    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,093,169    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 212,052    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,093,169    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 212,052    
Operating Properties [Member] | 3608 Queen Palm Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 650,384    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,764,301    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 32,287    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 650,384    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,796,588    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,446,972    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 139,360    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,446,972    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 139,360    
Operating Properties [Member] | 4502 Woodland Corporate Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,035,422    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,472,386    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,071,535    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,436,273    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,507,808    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,216,693    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,507,808    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,216,693    
Operating Properties [Member] | 4503 Woodland Corporate Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 619,913    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,876,500    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 619,913    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,876,500    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,496,413    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 973,291    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,496,413    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 973,291    
Operating Properties [Member] | 4505 Woodland Corporate Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 516,594    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,443,438    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 716,594    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,243,438    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,960,032    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 789,237    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,960,032    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 789,237    
Operating Properties [Member] | 4508 Woodland Corporate Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 498,598    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,087,970    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 556,887    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,029,681    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,586,568    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,127,131    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,586,568    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,127,131    
Operating Properties [Member] | 4511 Woodland Corporate Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 516,594    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,311,508    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 686,594    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,141,508    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,828,102    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 642,253    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,828,102    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 642,253    
Operating Properties [Member] | 4520 Seedling Circle [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 854,797    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 42,131    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,724,029    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 854,797    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,766,160    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,620,957    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 669,577    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2003    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,620,957    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 669,577    
Operating Properties [Member] | 4630 Woodland Corporate Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 943,169    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 14,042,129    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,560,099    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 13,425,199    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 14,985,298    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 4,914,641    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 14,985,298    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 4,914,641    
Operating Properties [Member] | 4631 Woodland Corporate Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,453,367    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 13,375,916    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,908,792    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 12,920,491    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 14,829,283    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,715,755    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 14,829,283    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,715,755    
Operating Properties [Member] | 501 US Highway 301 South [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 898,884    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,412,262    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 900,508    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,410,638    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,311,146    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,040,719    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,311,146    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,040,719    
Operating Properties [Member] | 5250 Eagle Trail Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 952,860    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,464,999    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 952,860    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,464,999    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,417,859    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,322,152    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,417,859    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,322,152    
Operating Properties [Member] | 5501-5519 Pioneer Park Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 162,000    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,613,000    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 963,054    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 262,416    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,475,638    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,738,054    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,097,196    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1981    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,738,054    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,097,196    
Operating Properties [Member] | 5690-5694 Crenshaw Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 181,923    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,812,496    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 784,786    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 181,923    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,597,282    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,779,205    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,019,089    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1979    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,779,205    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,019,089    
Operating Properties [Member] | 701-725 South US Hwy 301 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 419,683    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,418,844    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 661,680    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,176,847    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,838,527    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,261,568    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,838,527    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,261,568    
Operating Properties [Member] | 7621 Bald Cypress Place (Bldg N) [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 716,580    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 132,773    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 604,699    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 447,498    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,006,554    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,454,052    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 260,020    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,454,052    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 260,020    
Operating Properties [Member] | 7724 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 235,893    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,244,863    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 235,894    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,244,862    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,480,756    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 784,825    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,480,756    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 784,825    
Operating Properties [Member] | 7725 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 553,335    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,396,664    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 771,501    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,178,498    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,949,999    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,177,442    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,949,999    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,177,442    
Operating Properties [Member] | 7802-50 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 357,364    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,948,109    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 506,949    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,798,524    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,305,473    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 899,310    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,305,473    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 899,310    
Operating Properties [Member] | 7851-7861 Woodland Center Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 548,905    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,241,627    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 204,199    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 548,905    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,445,826    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,994,731    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 520,111    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,994,731    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 520,111    
Operating Properties [Member] | 7852-98 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 357,364    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,662,010    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 506,949    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,512,425    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,019,374    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 931,414    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,019,374    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 931,414    
Operating Properties [Member] | 7920 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,082,648    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,445,444    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 434,554    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,082,648    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,879,998    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,962,646    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,050,378    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,962,646    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,050,378    
Operating Properties [Member] | 7930, 8010-20 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,408,478    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,247,246    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,166,149    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,408,478    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,413,395    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,821,873    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,782,366    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,821,873    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,782,366    
Operating Properties [Member] | 8001 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 350,406    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,295,752    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 438,061    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,208,097    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,646,158    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 796,181    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,646,158    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 796,181    
Operating Properties [Member] | 8110 Anderson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 912,663    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,425,143    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 70,834    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 912,663    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,495,977    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,408,640    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 177,417    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,408,640    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 177,417    
Operating Properties [Member] | 8112-42 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 513,263    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,230,239    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 649,274    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 513,263    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,879,513    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,392,776    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,782,213    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1995    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,392,776    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,782,213    
Operating Properties [Member] | 8130 Anderson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 655,668    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,132,076    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 26,203    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 655,668    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,158,279    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,813,947    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 133,968    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,813,947    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 133,968    
Operating Properties [Member] | 8154-8198 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 399,088    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,868,834    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,074,969    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 399,088    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,943,803    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,342,891    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,561,150    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,342,891    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,561,150    
Operating Properties [Member] | 8401-8408 Benjamin Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 789,651    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,454,648    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 325,682    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 611,626    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,958,355    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,569,981    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,434,848    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1986    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,569,981    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,434,848    
Operating Properties [Member] | 8705 Henderson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 4,303,870    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 23,688,409    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements (15,944)    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,304,102    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 23,672,234    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 27,976,336    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 5,416,432    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 27,976,336    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 5,416,432    
Operating Properties [Member] | 8715 Henderson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,343,910    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 18,325,599    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 323,223    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,344,090    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 18,648,642    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 21,992,732    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 4,784,886    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 21,992,732    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 4,784,886    
Operating Properties [Member] | 8725 Henderson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,167,787    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 19,126,318    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 342,145    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,167,958    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 19,468,292    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 22,636,250    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 4,944,543    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 22,636,250    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 4,944,543    
Operating Properties [Member] | 8735 Henderson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,166,130    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 18,735,573    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,276,725    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,166,300    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 20,012,128    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 23,178,428    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 4,997,971    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 23,178,428    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 4,997,971    
Operating Properties [Member] | 8745 Henderson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,050,439    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 11,173,008    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements (44,065)    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,050,548    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 11,128,834    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 13,179,382    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,936,630    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 13,179,382    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,936,630    
Operating Properties [Member] | 8900-34 Brittany Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 537,194    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,664,883    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 978,019    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,224,058    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,202,077    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 871,357    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,202,077    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 871,357    
Operating Properties [Member] | 8921 Brittany Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 224,369    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,063,882    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 868,340    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 254,493    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,902,098    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,156,591    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 729,000    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,156,591    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 729,000    
Operating Properties [Member] | 9001-9015 Brittany Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 209,841    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,806,688    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 364,514    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,652,015    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,016,529    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 670,629    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,016,529    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 670,629    
Operating Properties [Member] | 9002-9036 Brittany Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 492,320    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,785,603    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 899,284    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,378,639    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,277,923    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,255,220    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,277,923    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,255,220    
Operating Properties [Member] | 901-933 US Highway 301 South [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 500,391    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,162,685    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 840,314    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,822,762    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,663,076    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,522,409    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,663,076    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,522,409    
Operating Properties [Member] | 9020 King Palm [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,718,496    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 11,697,381    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 133,305    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,718,496    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 11,830,686    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 13,549,182    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 348,543    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 13,549,182    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 348,543    
Operating Properties [Member] | 910-926 Chad Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 201,771    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,214,583    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 628,237    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,788,117    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,416,354    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 975,719    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,416,354    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 975,719    
Operating Properties [Member] | 9110 King Palm Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,203,200    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,979,540    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 64,475    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,203,200    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,044,015    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,247,215    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 252,514    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,247,215    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 252,514    
Operating Properties [Member] | 9203 King Palm Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 754,832    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,966,864    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 92,249    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 754,832    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,059,113    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,813,945    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 211,377    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,813,945    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 211,377    
Operating Properties [Member] | 9306-24 East Broadway Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 450,440    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,303,369    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 486,004    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,267,805    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,753,809    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 479,734    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,753,809    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 479,734    
Operating Properties [Member] | 9319 Peach Palm Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 612,536    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,168,473    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 9,700    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 612,536    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,178,173    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,790,709    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 115,323    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,790,709    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 115,323    
Operating Properties [Member] | 9704 Solar Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 374,548    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,354,800    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 126,348    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 374,548    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,481,148    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,855,696    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 37,252    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,855,696    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 37,252    
Operating Properties [Member] | 921 South Park Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tempe, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,192,820    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,580,155    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 477,881    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,192,820    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,058,037    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,250,857    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 129,894    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,250,857    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 129,894    
Operating Properties [Member] | 8313 West Pierce Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tolleson, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,295,090    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 9,079,811    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,224,097    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,295,090    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 12,303,908    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 14,598,998    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,702,937    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 14,598,998    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,702,937    
Operating Properties [Member] | 8591 West Washington [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tolleson, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,574,912    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,308,021    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 274,301    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,574,912    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,582,322    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,157,234    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 347,237    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,157,234    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 347,237    
Operating Properties [Member] | 8601 West Washington [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tolleson, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,524,603    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,352,070    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 493,296    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,524,603    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,845,366    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,369,969    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 350,898    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,369,969    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 350,898    
Operating Properties [Member] | 1457 Miller Store Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Virginia Beach, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 473,689    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,663,045    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 413,058    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 474,746    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,075,046    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,549,792    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 910,738    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2003    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,549,792    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 910,738    
Operating Properties [Member] | 200 Golden Oak Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Virginia Beach, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,116,693    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,770,480    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,106,737    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,116,693    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,877,217    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,993,910    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,538,776    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,993,910    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,538,776    
Operating Properties [Member] | 208 Golden Oak Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Virginia Beach, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 965,177    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,728,717    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,870,956    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 965,177    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,599,673    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,564,850    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,552,417    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,564,850    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,552,417    
Operating Properties [Member] | 2809 South Lynnhaven Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Virginia Beach, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 953,590    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,142,742    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,769,833    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 953,590    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,912,575    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,866,165    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,130,409    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1987    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,866,165    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,130,409    
Operating Properties [Member] | 484 Viking Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Virginia Beach, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 891,753    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,607,890    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 513,437    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 891,753    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,121,326    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,013,079    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,655,629    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1987    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,013,079    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,655,629    
Operating Properties [Member] | 629 Phoenix Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Virginia Beach, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 371,694    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,108,097    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 250,511    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 371,694    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,358,608    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,730,302    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 973,996    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1996    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,730,302    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 973,996    
Operating Properties [Member] | 1100 17th Street NW [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Washington, DC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 16,558,660    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 32,223,978    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 954,372    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 16,558,660    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 33,178,350    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 49,737,010    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,041,022    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 49,737,010    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,041,022    
Operating Properties [Member] | 1200 Liberty Ridge Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Wayne, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 6,215,667    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 9,208,335    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,223,660    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,200,342    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 15,424,002    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,867,751    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 15,424,002    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,867,751    
Operating Properties [Member] | 1500 Liberty Ridge [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Wayne, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 8,287,555    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 34,049,515    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 11,636,499    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 30,700,571    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 42,337,070    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 10,277,630    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 42,337,070    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 10,277,630    
Operating Properties [Member] | 825 Duportail Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Wayne, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 5,536,619    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 16,179,213    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,024,030    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,539,281    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 21,200,581    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 26,739,862    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 7,648,775    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1979    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 26,739,862    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 7,648,775    
Operating Properties [Member] | 400-500 Brandywine Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property West Chester, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 845,846    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,809,025    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 656,823    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 845,846    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,465,848    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,311,694    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,029,672    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,311,694    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,029,672    
Operating Properties [Member] | 600 Brandywine Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property West Chester, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 664,899    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,352,410    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 814,645    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 664,899    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,167,055    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,831,954    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,577,095    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,831,954    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,577,095    
Operating Properties [Member] | 1 Kings Hill Aveune [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property West Malling, UK    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 4,288,389    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 10,583,801    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,142,996    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,729,194    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 14,872,190    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,065,152    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 14,872,190    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,065,152    
Operating Properties [Member] | 42 Kings Hill Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property West Malling, UK    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 5,397,739    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 13,460,795    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,497,753    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 14,360,781    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 18,858,534    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,390,197    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 18,858,534    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,390,197    
Operating Properties [Member] | Liberty Square Retail Blocks [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property West Malling, UK    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 559,590    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,113,902    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,984,564    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,191,419    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,466,637    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,658,056    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,790,561    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,658,056    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,790,561    
Operating Properties [Member] | 40 Logistics Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Carlisle, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 7,981,850    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 30,108,809    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 8,081,272    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 30,009,387    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 38,090,659    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 459,967    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 38,090,659    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 459,967    
Operating Properties [Member] | 135-195 East Elk Trail [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Carol Stream, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 4,873,094    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 12,430,320    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 459,455    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,873,094    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 12,889,775    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 17,762,869    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 46,085    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 17,762,869    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 46,085    
Operating Properties [Member] | 515 Kehoe Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Carol Stream, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 5,523,427    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 14,581,705    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,523,427    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 14,581,705    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 20,105,132    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 56,145    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 20,105,132    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 56,145    
Operating Properties [Member] | 1413 Bradley Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Carrollton, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 247,477    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,028,322    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 83,523    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 247,477    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,111,845    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,359,322    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 18,245    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,359,322    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 18,245    
Operating Properties [Member] | 3200 Belmeade Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Carrollton, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,042,453    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 8,027,974    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 401,254    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,042,453    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,429,228    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,471,681    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 67,676    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,471,681    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 67,676    
Operating Properties [Member] | 1475 Nitterhouse Dr [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Chambersburg, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 7,081,007    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 39,002,011    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,083,301    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 7,081,007    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 41,085,312    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 48,166,319    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 337,082    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 48,166,319    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 337,082    
Operating Properties [Member] | 14400 Hollister Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,830,419    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 6,654,454    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,861,540    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,623,333    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,484,873    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 16,966    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,484,873    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 16,966    
Operating Properties [Member] | 15102 Sommermeyer St [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 755,121    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,155,774    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 230,571    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 755,121    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,386,345    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,141,466    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 36,052    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,141,466    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 36,052    
Operating Properties [Member] | 15150 Sommermeyer St [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 418,580    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,564,587    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 131,319    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 418,580    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,695,906    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,114,486    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 17,228    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,114,486    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 17,228    
Operating Properties [Member] | Liberty 11 at Central Green [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,748,348    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 9,336,316    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,120,319    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,964,345    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 11,084,664    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 164,651    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 11,084,664    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 164,651    
Operating Properties [Member] | Cabot III UK1B01 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Isle of Man, UK    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 11,888,058    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 35,003,668    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 11,888,058    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 35,003,668    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 46,891,726    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 646,011    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 46,891,726    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 646,011    
Operating Properties [Member] | 1011 N Hilltop Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Itasca, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 842,043    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 984,087    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 42,920    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 842,043    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,027,007    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,869,050    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 7,617    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,869,050    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 7,617    
Operating Properties [Member] | 4047 Perimeter West Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Charlotte, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,279,004    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 6,391,962    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,279,004    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,391,962    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,670,966    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 293,396    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,670,966    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 293,396    
Operating Properties [Member] | 5500 N. Sam Houston Parkway West [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,243,541    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 6,452,951    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,513,152    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,183,340    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,696,492    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 295,882    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,696,492    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 295,882    
Operating Properties [Member] | 5910 West by Northwest Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 891,397    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,765,299    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 203,141    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 891,397    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,968,440    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,859,837    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 40,200    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,859,837    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 40,200    
Operating Properties [Member] | 8017 Pinemont Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 900,953    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,323,727    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 114,191    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 900,953    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,437,918    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,338,871    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 45,057    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,338,871    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 45,057    
Operating Properties [Member] | 8272 El Rio Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 530,494    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,108,626    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 206,722    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 530,494    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,315,348    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,845,842    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 35,649    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,845,842    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 35,649    
Operating Properties [Member] | 8282 El Rio Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 450,422    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,304,942    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 180,261    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 450,422    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,485,203    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,935,625    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 30,003    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,935,625    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 30,003    
Operating Properties [Member] | 8301 Fallbrook Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 4,515,862    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 24,080,332    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,877,884    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 22,718,310    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 28,596,194    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 3,572,248    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 28,596,194    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 3,572,248    
Operating Properties [Member] | 4000 S 26th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Philadelphia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 51,784    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 7,097,969    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 616,467    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,533,286    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,149,753    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 228,285    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,149,753    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 228,285    
Operating Properties [Member] | 4050 S 26th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Philadelphia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 46,301    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 7,018,037    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 616,670    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,447,668    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,064,338    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 280,999    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,064,338    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 280,999    
Operating Properties [Member] | 5 Crescent Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Philadelphia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,765,341    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 74,982,228    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,897,041    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 74,850,528    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 76,747,569    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,827,449    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 76,747,569    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,827,449    
Operating Properties [Member] | 8th & Walnut Streets [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Philadelphia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 44,463,003    
Real Estate and Accumulated Depreciation, Initial Cost of Land 734,275    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 45,224,560    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,349,661    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 41,609,174    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 45,958,835    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 341,951    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 45,958,835    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 341,951    
Operating Properties [Member] | Cotton Center Building 18 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Phoenix, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 11,222,938    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 15,254,730    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 11,318,033    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 15,159,635    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 26,477,668    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 309,257    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 26,477,668    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 309,257    
Operating Properties [Member] | 1000 Klein Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Plano, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 706,660    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,894,330    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 248,060    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 706,660    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,142,391    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,849,051    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 47,536    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,849,051    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 47,536    
Operating Properties [Member] | 1901 10th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Plano, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 555,168    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,401,789    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 336,023    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 555,168    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,737,812    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,292,980    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 57,231    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,292,980    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 57,231    
Operating Properties [Member] | 1909 10th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Plano, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 551,706    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,797,440    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 262,150    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 551,706    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,059,590    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,611,296    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 51,828    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,611,296    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 51,828    
Operating Properties [Member] | 3605 East Plano Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Plano, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,047,996    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 9,218,748    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 355,589    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,047,996    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 9,574,336    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 10,622,332    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 76,223    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 10,622,332    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 76,223    
Operating Properties [Member] | 3701 East Plano Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Plano, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 877,564    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,460,686    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 332,221    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 877,564    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,792,906    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,670,470    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 63,480    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,670,470    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 63,480    
Operating Properties [Member] | 800 Klein Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Plano, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 580,456    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,681,283    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 299,393    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 580,456    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,980,676    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,561,132    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 53,087    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,561,132    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 53,087    
Operating Properties [Member] | 900 Klein Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Plano, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 723,534    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,004,923    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 349,690    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 723,534    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,354,613    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,078,147    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 53,655    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,078,147    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 53,655    
Operating Properties [Member] | 4450 South 44th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Phoenix, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 5,380,972    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 9,257,593    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 6,391,283    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,247,282    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 14,638,565    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 2,049,181    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 14,638,565    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 2,049,181    
Operating Properties [Member] | 9801 South 51st Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Phoenix, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,225,839    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,059,235    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,063,738    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,225,839    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,122,973    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,348,812    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 267,643    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,348,812    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 267,643    
Operating Properties [Member] | 3095 Presidential Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Atlanta, GA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 200,351    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,729,161    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 86,151    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 200,351    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,815,312    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,015,663    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 14,655    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,015,663    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 14,655    
Operating Properties [Member] | 3097 Presidential Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Atlanta, GA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 188,680    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,721,048    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 82,483    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 188,680    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,803,531    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,992,211    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 20,624    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,992,211    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 20,624    
Operating Properties [Member] | 7030 Buford Highway NE [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Atlanta, GA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 919,850    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,051,340    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 406,470    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 919,850    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,457,810    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,377,660    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 43,359    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,377,660    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 43,359    
Operating Properties [Member] | Barton 150 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Barton Under Needwood, UK    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,196,955    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 13,643,981    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,196,955    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 13,643,981    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 15,840,936    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 246,794    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 15,840,936    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 246,794    
Operating Properties [Member] | 1055-1071 Kingsland Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Batavia, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 727,294    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,367,529    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 147,582    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 727,294    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,515,111    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,242,405    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 22,389    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,242,405    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 22,389    
Operating Properties [Member] | 11800 Baltimore Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Beltsville,MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,769,962    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,829,028    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 85,389    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,769,962    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,914,418    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,684,380    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 20,796    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,684,380    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 20,796    
Operating Properties [Member] | 11850 Baltimore Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Beltsville,MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,595,044    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,415,132    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 178,910    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,595,044    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,594,042    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,189,086    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 32,100    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,189,086    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 32,100    
Operating Properties [Member] | 11900 Baltimore Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Beltsville,MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,492,036    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,024,038    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 237,559    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,492,036    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,261,597    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,753,633    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 39,318    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,753,633    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 39,318    
Operating Properties [Member] | 12104 Indian Creek Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Beltsville,MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,021,752    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,503,802    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 214,416    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,021,752    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,718,218    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,739,970    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 34,626    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,739,970    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 34,626    
Operating Properties [Member] | 12140 Indian Creek Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Beltsville,MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,196,726    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,949,555    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 91,813    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,196,726    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,041,367    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,238,093    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 16,680    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,238,093    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 16,680    
Operating Properties [Member] | 12200 Indian Creek Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Beltsville,MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,347,882    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,460,291    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 102,190    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,347,882    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,562,481    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,910,363    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 13,071    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,910,363    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 13,071    
Operating Properties [Member] | 12240 Indian Creek Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Beltsville,MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,479,307    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,159,997    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 124,828    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,479,307    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,284,826    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,764,133    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 18,678    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,764,133    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 18,678    
Operating Properties [Member] | 1071 Thorndale Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Bensenville,IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,173,006    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,280,788    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 162,564    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,173,006    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,443,352    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,616,358    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 31,689    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,616,358    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 31,689    
Operating Properties [Member] | 1260-1274 Ellis Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Bensenville,IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,298,560    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,020,382    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 358,604    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,298,560    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,378,986    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,677,546    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 44,404    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,677,546    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 44,404    
Operating Properties [Member] | 371-377 Meyer Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Bensenville,IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,903,423    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,563,953    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 300,151    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,903,423    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,864,104    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,767,527    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 37,194    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,767,527    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 37,194    
Operating Properties [Member] | 850-880 Devon Ave [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Bensenville,IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,958,756    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,959,013    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 548,843    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,958,756    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,507,856    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 11,466,612    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 76,496    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 11,466,612    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 76,496    
Operating Properties [Member] | 917 Lone Oak Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eagan, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,493,115    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,120,455    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 535,886    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,493,115    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,656,341    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,149,456    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 66,015    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,149,456    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 66,015    
Operating Properties [Member] | 2250 Arthur Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Elk Grove, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,403,196    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,386,396    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 51,263    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,403,196    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,437,659    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,840,855    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 20,679    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,840,855    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 20,679    
Operating Properties [Member] | 6675 Business Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Elkridge, MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,421,854    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 9,730,192    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 225,677    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,421,854    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 9,955,869    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 12,377,723    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 73,191    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 12,377,723    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 73,191    
Operating Properties [Member] | 1800 Donaldson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Erlanger, KY    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 0    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 13,211,604    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 616,661    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 13,828,265    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 13,828,265    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 115,624    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 13,828,265    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 115,624    
Operating Properties [Member] | 6880 Fairfield Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Fairfield, OH    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 412,136    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,029,177    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 74,745    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 412,136    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,103,922    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,516,058    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 24,226    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,516,058    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 24,226    
Operating Properties [Member] | 7000-7018 Fairfield Business [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Fairfield, OH    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 367,925    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,205,817    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 79,892    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 367,925    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,285,709    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,653,634    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 19,689    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,653,634    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 19,689    
Operating Properties [Member] | 2000 Southpointe Dr [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Forest Park, GA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 756,221    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 9,115,626    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 429,263    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 756,221    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 9,544,889    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 10,301,110    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 81,581    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 10,301,110    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 81,581    
Operating Properties [Member] | 1400 NW 65th Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Fort Lauderdale, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 545,480    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,540,210    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 66,119    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 545,480    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,606,329    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,151,809    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 18,432    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,151,809    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 18,432    
Operating Properties [Member] | 6500 NW 12th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Fort Lauderdale, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 0    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,064,734    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 159,947    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,224,681    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,224,681    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 27,778    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,224,681    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 27,778    
Operating Properties [Member] | 6501 NW 12th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Fort Lauderdale, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 519,984    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,677,465    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 51,998    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 519,984    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,729,463    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,249,447    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 20,525    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,249,447    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 20,525    
Operating Properties [Member] | 6600 NW 12th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Fort Lauderdale, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 0    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,988,181    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 159,201    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,147,382    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,147,382    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 28,193    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,147,382    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 28,193    
Operating Properties [Member] | 5400 Alliance Gateway Freeway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Fort Worth, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,515,860    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,710,118    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 403,669    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,515,860    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,113,787    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,629,647    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 72,186    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,629,647    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 72,186    
Operating Properties [Member] | 101 Constitution Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Franklin, MA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 532,339    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,206,412    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 310,120    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 532,339    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,516,532    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,048,871    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 96,829    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,048,871    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 96,829    
Operating Properties [Member] | 20 Liberty Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Franklin, MA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 618,521    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,570,341    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 339,916    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 618,521    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,910,257    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,528,778    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 50,621    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,528,778    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 50,621    
Operating Properties [Member] | 12601 Industry Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Garden Grove, CA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,048,143    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,088,697    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 70,518    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,048,143    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,159,215    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,207,358    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 17,229    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,207,358    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 17,229    
Operating Properties [Member] | 12641 Industry Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Garden Grove, CA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,766,822    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,539,214    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 132,812    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,766,822    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,672,026    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,438,848    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 22,781    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,438,848    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 22,781    
Operating Properties [Member] | 850 S Jupiter Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Garland, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 799,707    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,122,065    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 249,660    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 799,707    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,371,725    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,171,432    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 50,441    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,171,432    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 50,441    
Operating Properties [Member] | 2510 W Main Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Grand Prairie, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,785,741    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 11,158,818    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 869,832    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,785,741    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 12,028,650    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 13,814,391    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 117,548    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 13,814,391    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 117,548    
Operating Properties [Member] | 4251 North Highway 121 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Grapevine, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,165,780    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,799,270    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 420,260    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,165,780    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,219,529    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,385,309    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 71,766    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,385,309    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 71,766    
Operating Properties [Member] | 2011 Southtech Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Greenwood, IN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 223,702    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,574,142    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 310,465    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 223,702    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,884,607    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,108,309    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 41,409    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,108,309    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 41,409    
Operating Properties [Member] | 1035 N Hilltop Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Itasca, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 875,172    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,071,051    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 52,042    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 875,172    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,123,094    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,998,266    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 16,965    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,998,266    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 16,965    
Operating Properties [Member] | 1549 W Glenlake Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Itasca, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,339,627    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,763,288    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 79,355    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,339,627    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,842,642    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,182,269    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 29,399    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,182,269    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 29,399    
Operating Properties [Member] | 901 N Hilltop Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Itasca, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 866,378    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,112,616    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 38,715    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 866,378    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,151,331    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,017,709    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 15,922    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,017,709    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 15,922    
Operating Properties [Member] | 925 N Hilltop Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Itasca, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 945,251    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,010,181    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 46,316    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 945,251    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,056,497    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,001,748    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 15,961    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,001,748    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 15,961    
Operating Properties [Member] | 8241 Sandy Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Jessup, MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,246,618    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,844,393    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 270,912    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,246,618    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,115,304    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,361,922    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 56,334    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,361,922    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 56,334    
Operating Properties [Member] | 8242 Sandy Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Jessup, MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,488,746    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 9,072,440    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 363,544    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,488,746    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 9,435,984    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 10,924,730    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 70,410    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 10,924,730    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 70,410    
Operating Properties [Member] | 8246 Sandy Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Jessup, MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 590,922    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,374,522    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 65,542    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 590,922    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,440,064    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,030,986    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 26,282    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,030,986    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 26,282    
Operating Properties [Member] | 1305 Chastain Road NW [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Kennesaw, GA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 808,159    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,712,959    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 536,521    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 808,159    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,249,480    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,057,639    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 63,945    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,057,639    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 63,945    
Operating Properties [Member] | 1325 Chastain Road NW [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Kennesaw, GA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,612,924    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 9,771,680    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,055,382    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,612,924    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,827,062    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 12,439,986    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 117,822    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 12,439,986    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 117,822    
Operating Properties [Member] | 3600 Cobb International Bld NW [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Kennesaw, GA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 716,860    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,962,212    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 409,426    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 716,860    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,371,639    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,088,499    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 67,898    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,088,499    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 67,898    
Operating Properties [Member] | Unit 1 Bear Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Kettering, UK    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 10,849,890    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 36,219,855    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 10,849,890    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 36,219,855    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 47,069,745    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 667,061    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 47,069,745    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 667,061    
Operating Properties [Member] | 21 S Middlesex Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Monroe Township, NJ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,097,170    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 9,715,401    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 535,119    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,097,170    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,250,520    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 12,347,690    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 92,629    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 12,347,690    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 92,629    
Operating Properties [Member] | 4 S Middlesex Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Monroe Township, NJ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,263,153    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 10,261,759    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 594,026    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,263,153    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,855,785    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 13,118,938    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 88,852    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 13,118,938    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 88,852    
Operating Properties [Member] | 220 Lake Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Newark, DE    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 566,650    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,099,337    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 361,819    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 566,650    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,461,156    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,027,806    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 80,822    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,027,806    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 80,822    
Operating Properties [Member] | 222 Lake Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Newark, DE    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,045,238    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,975,553    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 149,013    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,045,238    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,124,565    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,169,803    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 29,443    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,169,803    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 29,443    
Operating Properties [Member] | 4000 E Airport Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Ontario, CA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,686,533    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 10,125,772    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 347,718    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,686,533    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,473,490    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 13,160,023    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 81,663    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 13,160,023    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 81,663    
Operating Properties [Member] | 2000 Park Oaks Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 913,201    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,818,610    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 230,114    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 913,201    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,048,724    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,961,925    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 58,079    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,961,925    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 58,079    
Operating Properties [Member] | 2212 Taft Vineland Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 838,853    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,084,540    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 767,953    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,155,440    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,923,393    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 954,226    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,923,393    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 954,226    
Operating Properties [Member] | 5905 Trenton Lane North [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Plymouth, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,616,360    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,487,462    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 388,509    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,616,360    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,875,970    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,492,330    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 45,381    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Life Used for Depreciation 5 years    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,492,330    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 45,381    
Operating Properties [Member] | 6055 Nathan Lane North [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Plymouth, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,327,017    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,527,404    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 319,429    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,327,017    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,846,833    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,173,850    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 43,172    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Life Used for Depreciation 5 years    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,173,850    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 43,172    
Operating Properties [Member] | 2201-2215 NW 30th Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Pompano Beach, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,120,328    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,427,358    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 96,028    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,120,328    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,523,386    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,643,714    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 30,893    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Life Used for Depreciation 5 years    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,643,714    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 30,893    
Operating Properties [Member] | 2250-2270 NW 30th Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Pompano Beach, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 993,015    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,423,174    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 123,273    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 993,015    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,546,447    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,539,462    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 21,532    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Life Used for Depreciation 5 years    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,539,462    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 21,532    
Operating Properties [Member] | 2280-2300 NW 30th Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Pompano Beach, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 906,947    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,157,802    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 156,054    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 906,947    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,313,857    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,220,804    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 17,823    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Life Used for Depreciation 5 years    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,220,804    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 17,823    
Operating Properties [Member] | 2301-2329 NW 30th Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Pompano Beach, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,268,707    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,079,811    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 109,158    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,268,707    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,188,969    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,457,676    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 28,692    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Life Used for Depreciation 5 years    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,457,676    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 28,692    
Operating Properties [Member] | 3000 NW 25th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Pompano Beach, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,087,554    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,897,117    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 107,430    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,087,554    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,004,547    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,092,101    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 28,291    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Life Used for Depreciation 5 years    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,092,101    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 28,291    
Operating Properties [Member] | 3001-3037 NW 25th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Pompano Beach, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,548,542    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,512,041    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 182,217    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,548,542    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,694,259    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,242,801    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 34,966    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Life Used for Depreciation 5 years    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,242,801    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 34,966    
Operating Properties [Member] | 3012-3050 NW 25th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Pompano Beach, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,112,781    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,763,862    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 209,767    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,112,781    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,973,628    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,086,409    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 24,616    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Life Used for Depreciation 5 years    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,086,409    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 24,616    
Operating Properties [Member] | 8720 Rochester Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Ranco Cucamonga, CA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,304,547    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,371,959    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 104,950    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,304,547    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,476,909    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,781,456    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 25,864    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,781,456    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 25,864    
Operating Properties [Member] | 1210 Champion Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Sharonville, OH    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,337,271    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,135,118    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 489,270    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,337,271    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,624,389    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,961,660    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 112,936    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,961,660    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 112,936    
Operating Properties [Member] | 3990 Heritage Oak Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Simi Valley, CA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,964,140    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 10,667,267    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 345,689    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,964,140    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 11,012,956    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 12,977,096    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 79,863    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 12,977,096    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 79,863    
Operating Properties [Member] | 3654-3668 Swenson Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property St. Charles, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 643,639    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,645,058    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 100,470    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 643,639    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,745,528    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,389,167    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 17,590    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,389,167    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 17,590    
Operating Properties [Member] | 3701 Illinois Ave [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property St. Charles, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 672,500    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,288,924    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 117,765    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 672,500    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,406,689    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,079,189    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 14,779    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,079,189    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 14,779    
Operating Properties [Member] | 3950-3980 Swenson Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property St. Charles, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 851,080    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,027,753    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 149,571    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 851,080    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,177,324    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,028,404    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 27,743    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,028,404    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 27,743    
Operating Properties [Member] | 1501 102nd Avenue North [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property St. Petersburg, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 283,474    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,230,868    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 96,546    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 283,474    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,327,413    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,610,887    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 18,314    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,610,887    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 18,314    
Operating Properties [Member] | 1527 102nd Avenue North [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property St. Petersburg, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 374,284    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,987,226    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 128,152    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 374,284    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,115,378    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,489,662    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 24,452    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,489,662    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 24,452    
Operating Properties [Member] | 1551 102nd Avenue North [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property St. Petersburg, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 699,797    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,214,438    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 254,949    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 699,797    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,469,387    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,169,184    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 64,802    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,169,184    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 64,802    
Operating Properties [Member] | 6920 Harbour View Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Suffolk, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 603,391    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 6,707,341    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,628,635    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,682,097    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,310,732    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 218,907    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,310,732    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 218,907    
Operating Properties [Member] | 6950 Harbour View Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Suffolk, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 929,844    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 6,485,717    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 794,848    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,620,713    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,415,561    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,337,252    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,415,561    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,337,252    
Operating Properties [Member] | 1516 Fryar Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Sumner, WA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,675,402    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,079,543    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 301,095    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,675,402    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,380,638    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,056,040    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 54,920    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,056,040    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 54,920    
Operating Properties [Member] | 100 Dartmouth Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Swedesboro, NJ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 909,723    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 11,453,198    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 138,839    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 909,723    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 11,592,037    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 12,501,760    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 102,087    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 12,501,760    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 102,087    
Operating Properties [Member] | 100 Gloucester Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Swedesboro, NJ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 829,732    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 8,758,904    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 262,213    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 829,732    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 9,021,118    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,850,850    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 81,346    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,850,850    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 81,346    
Operating Properties [Member] | 9945 Currie Davis Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,134,286    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 9,241,807    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 380,833    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,134,286    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 9,622,639    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 10,756,925    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 75,495    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 10,756,925    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 75,495    
Operating Properties [Member] | 1858 E Encanto Dr [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tempe, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 877,611    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,485,427    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 190,934    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 877,611    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,676,361    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,553,972    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 40,311    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,553,972    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 40,311    
Operating Properties [Member] | 475 W Vaughn St [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tempe, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,112,245    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,260,348    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 134,556    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,112,245    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,394,904    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,507,149    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 23,366    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,507,149    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 23,366    
Operating Properties [Member] | 5111 S Royal Atlanta Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tucker, GA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 435,776    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,875,685    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 214,242    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 435,776    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,089,928    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,525,704    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 23,119    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,525,704    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 23,119    
Operating Properties [Member] | 5151 S Royal Atlanta Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tucker, GA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 345,061    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,428,840    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 178,941    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 345,061    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,607,781    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,952,842    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 19,469    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,952,842    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 19,469    
Operating Properties [Member] | 2100 M Street NW [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Washington, DC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 70,000,000    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 55,123,783    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 27,462    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 70,000,000    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 55,151,245    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 125,151,245    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,775,617    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 125,151,245    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 1,775,617    
Operating Properties [Member] | 1400 Powis Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property West Chicago, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 578,314    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,448,562    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 72,419    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 578,314    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,520,981    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,099,295    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 18,384    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,099,295    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 18,384    
Operating Properties [Member] | 1400 Northpoint Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property West Palm Beach, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,454,972    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,312,829    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 276,502    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,454,972    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,589,331    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,044,303    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 54,818    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,044,303    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 54,818    
Operating Properties [Member] | 300 Northpoint Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property West Palm Beach, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,177,064    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,102,451    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 125,706    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,177,064    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,228,157    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,405,221    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 20,749    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,405,221    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 20,749    
Operating Properties [Member] | 400 Northpoint Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property West Palm Beach, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,029,595    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 1,728,187    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 109,374    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,029,595    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 1,837,561    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,867,156    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 15,908    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,867,156    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 15,908    
Operating Properties [Member] | 2935 West Corporate Lakes Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Weston, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 4,682,521    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 25,905,126    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 558,332    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,682,521    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 26,463,458    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 31,145,979    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 179,132    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 31,145,979    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 179,132    
Operating Properties [Member] | 2945 West Corporate Lakes Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Weston, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,345,242    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 13,973,766    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 273,455    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,345,242    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 14,247,221    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 16,592,463    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 95,264    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 16,592,463    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 95,264    
Operating Properties [Member] | 43-47 Hintz Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Wheeling, IL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0 [1]    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,051,093    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 18,283,480    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 536,842    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,051,093    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 18,820,323    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 20,871,416    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 134,175    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 20,871,416    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 134,175    
Operating Properties [Member] | 10 Cornell Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Wilmington, MA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 598,120    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,142,736    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 232,897    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 598,120    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,375,632    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,973,752    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 26,040    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,973,752    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 26,040    
Operating Properties [Member] | 265 Ballardvale Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Wilmington, MA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 868,433    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,358,998    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 324,566    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 868,433    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,683,564    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,551,997    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 74,959    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,551,997    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 74,959    
Development in Progress [Member] | 1467 Perryman Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Aberdeen, MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 12,052,635    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 16,209,308    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 28,261,943    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 28,261,943    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 28,261,943    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Development in Progress [Member] | 100 Caliber Ridge Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Greer, SC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 555,549    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,179,599    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,735,148    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,735,148    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,735,148    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Development in Progress [Member] | 7460 New Ridge Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hanover, MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,785,446    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,050,119    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,835,565    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,835,565    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,835,565    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Development in Progress [Member] | 7462 New Ridge Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hanover, MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 4,059,337    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,784,516    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,843,853    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,843,853    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,843,853    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Development in Progress [Member] | 1050 Greens Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 973,482    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,634,974    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,608,456    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,608,456    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,608,456    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Development in Progress [Member] | 11220 Ella Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,505,855    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 6,103,964    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,609,819    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,609,819    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,609,819    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Development in Progress [Member] | 14300 Hollister Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,377,193    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 5,204,006    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,581,199    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,581,199    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,581,199    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Development in Progress [Member] | 16330 Central Green Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,540,109    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 7,617,017    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 9,157,126    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,157,126    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,157,126    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Development in Progress [Member] | 8303 Fallbrook Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 4,613,370    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,282,520    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,895,890    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,895,890    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 7,895,890    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Development in Progress [Member] | 425 Old Morehall Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,847,501    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 24,622,365    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 28,469,866    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 28,469,866    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 28,469,866    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Development in Progress [Member] | 11500 NW 122 Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Miami, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,623,293    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 9,137,691    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,760,984    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 10,760,984    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 10,760,984    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Development in Progress [Member] | 201 Rouse Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Philadelphia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 243,905    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,859,694    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,103,599    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,103,599    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,103,599    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Development in Progress [Member] | 13225 Brockton Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Rogers, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,048,093    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,636,867    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,684,960    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,684,960    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,684,960    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Development in Progress [Member] | 13320 Wilfred Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Rogers, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 508,532    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 10,975,170    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 11,483,702    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 11,483,702    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 11,483,702    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Development in Progress [Member] | 9300 Old Scotland Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Shippensburg, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 10,232,633    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 50,083,929    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 60,316,562    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 60,316,562    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 60,316,562    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Development in Progress [Member] | 1850 W Rio Salado Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tempe, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,975,600    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,862,428    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,838,028    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,838,028    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,838,028    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Development in Progress [Member] | Total Development in Progress [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 51,942,533    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 157,244,167    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 209,186,700    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 209,186,700    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 209,186,700    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | 4551 New York Avenue Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Arlington, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 4,754,659    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements (17,253)    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,737,406    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,737,406    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,737,406    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Suffolk Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Suffolk, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,715,714    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 767,883    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,483,597    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,483,597    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,483,597    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | LVIP Area VII-Lots 3, 4, 5 Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Bethlehem, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 6,058,664    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,832,704    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 8,891,368    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,891,368    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,891,368    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Mill Creek Road Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Bethlehem, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 18,548,585    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,256,223    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 19,804,808    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 19,804,808    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 19,804,808    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Boca Colannade Yamato Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Boca Raton, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,039,735    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 556,668    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,596,403    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,596,403    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,596,403    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | 12912 Virkler Drive Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Charlotte, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 208,646    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 14,743    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 223,389    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 223,389    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2010    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 223,389    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Charlotte Distribution Center Land-Lot 1 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Charlotte, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 654,713    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements (2,376)    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 652,337    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 652,337    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 652,337    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Amberpoint Business Park Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Dallas, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,040,233    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 41,457    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,081,690    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,081,690    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,081,690    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Flying Cloud Drive Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Eden Pairie, MN    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,051,631    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 17,695    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,069,326    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,069,326    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,069,326    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Camelback 303 Business Center Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Goodyear, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 16,857,556    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,164,682    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 20,022,238    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 20,022,238    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 20,022,238    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Pleasant Ridge Road Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Greensboro, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 564,535    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,887,177    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,451,712    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,451,712    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,451,712    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Caliber Ridge Ind. Park Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Greer, SC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,811,803    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,639,848    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,451,651    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,451,651    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,451,651    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Hunters Green Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hagerstown, MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 5,489,586    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 8,581,024    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 14,070,610    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 14,070,610    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 14,070,610    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Lakefront Plaza II Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hampton, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 138,101    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 100,289    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 238,390    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 238,390    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 238,390    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Ridge Road & Hanover Road Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hanover, MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,875,203    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 71,152    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,946,355    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,946,355    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,946,355    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Ridge Road Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Hanover, MD    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,371,183    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 438,536    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,809,719    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,809,719    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2008    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,809,719    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Piedmond Centre Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property High Point, NC    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 913,276    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 907,686    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,820,962    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,820,962    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,820,962    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Commonwealth Corporate Center Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Horsham, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,043,938    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 14,024    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,057,962    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,057,962    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 3,057,962    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Interwood Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 5,160,668    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements (4,131)    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,156,537    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 5,156,537    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 5,156,537    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Rankin Road Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 5,756,865    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 252,866    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 6,009,731    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,009,731    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,009,731    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Taub Beltway 8 Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Houston, TX    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 9,511,795    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 49,341    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 9,561,136    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,561,136    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 9,561,136    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Kent County, UK [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Kent, UK    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 0    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,579,128    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,579,128    
Real Estate and Accumulated Depreciation, Accumulated Depreciation       
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,579,128    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation       
Land Held for Development [Member] | Commodore Business Park [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Logan, NJ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 792,118    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,061,915    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,854,033    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,854,033    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1995    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,854,033    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Spring Creek Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Lower Macungie Twp, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 25,615,668    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 168,389    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 25,784,057    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 25,784,057    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 25,784,057    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | 380 Old Morehall Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,344,809    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements (4,880)    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,339,929    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,339,929    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,339,929    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Quarry Ridge Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 675,499    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 675,499    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 675,499    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 675,499    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Miami International Tradeport Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Medley, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 16,739,632    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 7,848,096    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 24,587,728    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 24,587,728    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 24,587,728    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Monarch Towne Center Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Mirarar, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 6,085,337    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 390,343    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 6,475,680    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,475,680    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 6,475,680    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | 557 Nazareth Pike Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Nazareth, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 4,667,646    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 38,720    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,706,366    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,706,366    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,706,366    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | South 27th Street Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Oak Creek, WI    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 2,169,232    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,066,217    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,235,449    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,235,449    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 4,235,449    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Beachline Industrial Park Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Orlando, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 365,230    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements (1,325)    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 363,905    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 363,905    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 363,905    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | 26th Street North Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Philadelphia, PA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 90,774    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,047,441    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,138,215    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,138,215    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2009    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 1,138,215    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Buckeye Logistics Center West Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Phoenix, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 11,203,594    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements (34,100)    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 11,169,494    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 11,169,494    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 11,169,494    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Cotton Center Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Phoenix, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 8,238,461    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements (29,895)    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 8,208,566    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,208,566    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,208,566    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Eastport IX [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 211,627    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,545    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 214,172    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 214,172    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 214,172    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | 6119 W. Linebaugh Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 180,136    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 29,735    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 209,871    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 209,871    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 209,871    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Legacy Park Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 3,289,423    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,975,350    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 8,264,773    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,264,773    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,264,773    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Renaissance Park Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Tampa, FL    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 1,995,375    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 211,062    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,206,437    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,206,437    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 2,206,437    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Total Land Held for Development [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 185,939,126    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 44,537,061    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 233,055,315    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 233,055,315    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 233,055,315    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Eastport VIII [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Richmond, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 382,698    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,925    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 384,623    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 384,623    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 384,623    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Woodlands Center Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Sandston, VA    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 148,314    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 21,100    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 169,414    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 169,414    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1996    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 169,414    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation 0    
Land Held for Development [Member] | Northsight Land [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Location of Property Scottsdale, AZ    
Real Estate and Accumulated Depreciation, Amount of Encumbrances 0    
Real Estate and Accumulated Depreciation, Initial Cost of Land 6,176,464    
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 2,174,185    
Real Estate and Accumulated Depreciation, Carrying Amount of Land 8,350,649    
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 0    
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,350,649    
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0    
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Real Estate, Gross 8,350,649    
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Real Estate Accumulated Depreciation $ 0    
Maximum [Member] | Operating Properties [Member] | 1000 South Loop West [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 10241 W Little York Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 10245 W Little York Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2121 Southtech Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 800 Commerce Parkway West Dr [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6600 Business Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2785 Commerce Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8212 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 701 Distribution Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 300 Technology Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 120 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 116 Pleasant Ridge Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1501 Perryman Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 869 S Route 53 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 901 S Route 53 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 400 Nestle Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7248 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7339 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7437 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 700 Nestle Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8014 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 705 Boulder Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 651 Boulder Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8150 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8250 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 650 Boulder Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7165 Ambassador Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 200 Boulder Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 250 Boulder Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8400 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6560 Stonegate Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6370 Hedgewood Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6390 Hedgewood Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6350 Hedgewood Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6330 Hedgewood Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6580 Snowdrift Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6540 Stonegate Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6520 Stonegate Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7620 Cetronia Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 180,190 Cochrane Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4606 Richlynn Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 74 West Broad Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6601-6625 W. 78th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6161 Green Valley Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 10801 Nesbitt Avenue South [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5775 West Old Shakopee Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5715 Old Shakopee Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5735 Old Shakopee Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5705 Old Shakopee Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 951 Broken Sound Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1455 Remington Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 150 E Crossroads Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 553 S Joliet Ave [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 777 Yamato Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 750 Park of Commerce Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 400 Boulder Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8201 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8500 Industrial Bouldvard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 860 Nestle Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1485 W Commerce Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 95 Kriner Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 9000 109th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 11701 Goodrich Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 12810 Virkler Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2700 Hutchinson McDonald Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2701 Hutchinson McDonald Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2730 Hutchinson McDonald Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2801 Hutchinson McDonald Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3000 Crosspoint Center Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3005 Crosspoint Center Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4045 Perimeter West Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4525 Statesville Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4835 Sirona Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4925 Sirona Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5033 Sirona Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8910 Pioneer Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8916 Pioneer Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1309 Executive Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1305 Executive Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1313 Executive Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2601 Indian River Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 500 Independence Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 700 Independence Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1540 S 54th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4650 Lake Forest Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4750 Lake Forest Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 9645 Gerwig Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2550 John Glenn Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3800 Twin Creeks Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 455 Airline Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2130 Baldwin Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 329-333 Herrod Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 501 Independence Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 505 Independence Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 510 Independence Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1301 Executive Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 676 Independence Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1250 Hall Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 301-321 S Goolsby Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1680 Executive Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1700 Executive Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2670 Breckinridge Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 170 Parkway West [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 190 Parkway West [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 265 Parkway East [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 285 Parkway East [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3169 Dodd Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3255 Neil Armstrong Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3711 Kennebec Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 10301-10305 West 70th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 10321 West 70th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 10333 West 70th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 10349-10357 West 70th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 10365-10375 West 70th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 10393-10394 West 70th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 10400 Viking Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7075 Flying Cloud Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7078 Shady Oak Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7615 Smetana Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7625 Smetana Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7695-7699 Anagram Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7777 Golden Triangle Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7800 Equitable Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7905 Fuller Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8855 Columbine Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8911 Columbine Road (B2) [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8937 Columbine Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8967 Columbine Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8995 Columbine Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 9023 Columbine Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7351 Coca Cola Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 21705-21707 Mississippi Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 27143 S Baseline Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 180 Sheree Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 9601 Cosner Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 200 W Cypress Creek Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5410 - 5430 Northwest 33rd Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 45 Brookfield Oaks Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1487 South Highway 101 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2727 London Grove Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 11841 Newgate Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1 Enterprise Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1317 Executive Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 21 Enterprise Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 22 Enterprise Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5 Manhattan Square [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 521 Butler Farm Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1560 Hunter Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1575 Hunter Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7361 Coca Cola Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 500 McCarthy Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 600 Industrial Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7195 Grayson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7253 Grayson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 12537 Cerise Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1010 Petersburg Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 785 Lindbergh Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 805 Lindbergh Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 825 Lindbergh Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 845 Lindbergh Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1498 Eagle Hill Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4183 Eagle Hill Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4189 Eagle Hill Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4195 Eagle Hill Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4328, 4336 Federal Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4344 Federal Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4380 Federal Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4388 Federal Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4475 Premier Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4500 Green Point Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4501 Green Point Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4523 Green Point Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4524 Green Point Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | Unit 5 Logix Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1515 6th Street South [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1600 5th Street South [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 100 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 100 Witmer Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 100-107 Lakeside Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 101 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 101-111 Rock Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 102 Rock Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 103-109 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 104 Witmer Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 110 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 111-159 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 113-123 Rock Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 123-135 Rock Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 132 Welsh Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 161-175 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 181-187 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2 Walnut Grove Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 200 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 200-264 Lakeside Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 201 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 210-223 Witmer Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 220 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 231-237 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 240 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 255 Business Center Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 261-283 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 300 Welsh Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 300 Welsh Road - Building 3 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 300 Welsh Road - Building 4 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 300-309 Lakeside Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 355 Business Center Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4 Walnut Grove [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 400-445 Lakeside Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 455 Business Center Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5 Walnut Grove Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 506 Prudential Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 555 Business Center Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 680 Blair Mill Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7 Walnut Grove Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 700 Dresher Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 507 Prudential Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 747 Dresher Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 767 Electronic Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 10301 Round Up Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 10305 Round Up Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 10607 Haddington Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 10735 West Little York Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 10739 West Little York Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 11201 Greens Crossing Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 11502 South Main Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1283 N Post Oak Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1287 N Post Oak Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1291 N Post Oak Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1416 N Sam Houston Parkway E [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1420 N Sam Houston Parkway E [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 14200 Hollister Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1424 N Sam Houston Parkway E [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1428 N Sam Houston Parkway E [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 16405 Air Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 16420 West Hardy Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 16445 Air Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1646 Rankin Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1655 Townhurst Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 16580 Air Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 16602 Central Green Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 16605 Air Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1665 Townhurst Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 16680 Central Green Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 16685 Air Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1755 Trans Central Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4301 S Pinemont Dr [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4401 S Pinemont Dr [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4501 S Pinemont Dr [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5200 N. Sam Houston Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5250 N. Sam Houston Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 850 Greens Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 860 Greens Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8801 A-E Wallisville Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8801-19 & 8821-49 Fallbrook Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8802-8824 Fallbrook Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8811 A-E Wallisville Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8825-8839 N Sam Houston Pkwy [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8850-8872 Fallbrook Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 9500-9540 Clay Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 151 South Warner Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 180 South Warner Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2100 Renaissance Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2201 Renaissance Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2300 Renaissance Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2301 Renaissance Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2500 Renaissance Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2520 Renaissance Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2560 Renaissance Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2700 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2900 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3200 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3400 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3600 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3602 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3604 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 440 East Swedesford Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 460 East Swedesford Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 650 Swedesford Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 680 Swedesford Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 170 South Warner Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 190 South Warner Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3000 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3100 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3500 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1700 Interstate Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5801 Columbia Park Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 11425 State Highway 225 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 11503 State Highway 225 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 640 S State Road 39 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7528 Walker Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8301 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8500 Willard Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 875 Maxham Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2145 Center Square Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7533 Industrial Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1901 Summit Tower Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1 Country View Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 10 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 100 Chesterfield Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1001 Cedar Hollow Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 11 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 11,15 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 18 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2 West Liberty Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 200 Chesterfield Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 27-43 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3 Country View Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 375 Technology Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 40 Liberty Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 425 Technology Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 45 Liberty Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 45-67 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 50 Morehall Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 600 Chesterfield Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 700 Chesterfield Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 10 Valley Stream Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 10, 20 Liberty Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 12,14,16 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 14 Lee Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 155 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 20 Valley Stream Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 257-275 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 277-293 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 30 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 300-400 Chesterfield Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 311 Technology Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 333 Phoenixville Pike [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 40 Valley Stream Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 420 Lapp Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5 Country View Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 50 Valley Stream Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 500 Chesterfield Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 508 Lapp Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 510 Lapp Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 55 Valley Stream Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 60 Morehall Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 65 Valley Stream Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 75 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 77-123 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1169 Canton Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 65 Brookfield Oaks Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 75 Brookfield Oaks Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 126-132 Liberty Industrial Pkw [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 95-115 Liberty Industrial Pkwy [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 11401 NW 134th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3824-3960 Crowfarn Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4700 Nathan Lane North [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 12501 & 12701 Whitewater Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 12800 Whitewater Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 12900 Whitewater Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5400-5500 Feltl Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6000 Clearwater Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 456 International Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3100 SW 145th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3350 SW 148th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3400 Lakeside Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3450 Lakeside Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 323 Park Knoll Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 324 Park Knoll Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 619 Distribution Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 627 Distribution Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1879 Lamont Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 350 Winmeyer Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1000 Gills Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 10003 Satellite Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 10511 & 10611 Satellite Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 10771 Palm Bay Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1090 Gills Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1400-1440 Central Florida Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1902 Cypress Lake Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1950 Summit Park Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1958 Summit Park Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 201 Summit Park Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2202 Taft-Vineland Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2256 Taft-Vineland Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2351 Investors Row [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2400 South Lake Orange Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2412 Sand Lake Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2416 Lake Orange Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6200 Lee Vista Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6501 Lee Vista Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6918 Presidents Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6923 Lee Vista Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7022 TPC Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7100 TPC Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7101 TPC Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7315 Kingspointe Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8201 Chancellor Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 851 Gills Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 950 Gills Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 9550 Satellite Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 9600 Satellite Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 9700 Satellite Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 13 Centennial Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1 Crescent Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 12285 McNulty Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 150 Rouse Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3 Crescent Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4300 South 26th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4751 League Island Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4775 League Island Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2626 South 7th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4207 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4217 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4303 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4313 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4405 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4410 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4415 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4425 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4435 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4610 South 44th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4750 S. 44th Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 563 South 63rd Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 9801 80th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2250 Hickory Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 14630-14650 28th Avenue North [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2920 Northwest Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1400 SW 6th Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1405 SW 6th Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1500 SW 5th Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1501 SW 5th Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1601 SW 5th Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1651 SW 5th Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 595 SW 13th Terrace [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 601 SW 13th Terrace [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 605 SW 16th Terrace [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 301 Hill Carter Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4101-4127 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4201-4261 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4263-4299 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4263F-N. Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4301-4335 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4337-4379 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4401-4445 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4447-4491 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4501-4549 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4551-4593 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4601-4643 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4645-4683 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4717-4729 Eubank Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 510 Eastpark Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 520 Eastpark Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 530 Eastpark Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 540 Eastpark Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5600-5626 Eastport Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5601-5659 Eastport Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5650-5674 Eastport Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5700 Eastport Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5701-5799 Eastport Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5900 Eastport Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6000 Eastport Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2020 US Highway 301 South [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6530 Judge Adams Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6532 Judge Adams Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 13098 George Weber Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1070 Windham Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1550 Central Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1135 Aviation Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8715 Bollman Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8501 East Raintree Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1150 Gateway Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5555 12th Avenue East [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6900 Harbor View Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1301 International Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 13621 NW 12th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 13630 NW 8th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 13650 NW 8th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 111 Kelsey Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 131 Kelsey Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 150-182 Kelsey Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 200-34 Kelsey Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3102,3104,3110 Cherry Palm Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3401-3409 Cragmont Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3502 Roga Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3505 Cragmont Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3608 Queen Palm Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4502 Woodland Corporate Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4503 Woodland Corporate Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4505 Woodland Corporate Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4508 Woodland Corporate Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4511 Woodland Corporate Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4520 Seedling Circle [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4630 Woodland Corporate Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4631 Woodland Corporate Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 501 US Highway 301 South [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5250 Eagle Trail Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5501-5519 Pioneer Park Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5690-5694 Crenshaw Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 701-725 South US Hwy 301 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7621 Bald Cypress Place (Bldg N) [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7724 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7725 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7802-50 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7851-7861 Woodland Center Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7852-98 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7920 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7930, 8010-20 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8001 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8110 Anderson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8112-42 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8130 Anderson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8154-8198 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8401-8408 Benjamin Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8705 Henderson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8715 Henderson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8725 Henderson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8735 Henderson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8745 Henderson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8900-34 Brittany Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8921 Brittany Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 9001-9015 Brittany Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 9002-9036 Brittany Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 901-933 US Highway 301 South [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 9020 King Palm [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 910-926 Chad Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 9110 King Palm Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 9203 King Palm Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 9306-24 East Broadway Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 9319 Peach Palm Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 9704 Solar Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 921 South Park Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8313 West Pierce Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8591 West Washington [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8601 West Washington [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1457 Miller Store Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 200 Golden Oak Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 208 Golden Oak Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2809 South Lynnhaven Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 484 Viking Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 629 Phoenix Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1100 17th Street NW [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1200 Liberty Ridge Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1500 Liberty Ridge [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 825 Duportail Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 400-500 Brandywine Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 600 Brandywine Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1 Kings Hill Aveune [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 42 Kings Hill Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | Liberty Square Retail Blocks [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 40 Logistics Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 135-195 East Elk Trail [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 515 Kehoe Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1413 Bradley Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3200 Belmeade Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1475 Nitterhouse Dr [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 14400 Hollister Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 15102 Sommermeyer St [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 15150 Sommermeyer St [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | Liberty 11 at Central Green [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | Cabot III UK1B01 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1011 N Hilltop Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4047 Perimeter West Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5500 N. Sam Houston Parkway West [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5910 West by Northwest Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8017 Pinemont Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8272 El Rio Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8282 El Rio Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8301 Fallbrook Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4000 S 26th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4050 S 26th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5 Crescent Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8th & Walnut Streets [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | Cotton Center Building 18 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1000 Klein Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1901 10th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1909 10th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3605 East Plano Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3701 East Plano Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 800 Klein Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 900 Klein Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4450 South 44th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 9801 South 51st Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3095 Presidential Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3097 Presidential Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7030 Buford Highway NE [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | Barton 150 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1055-1071 Kingsland Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 11800 Baltimore Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 11850 Baltimore Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 11900 Baltimore Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 12104 Indian Creek Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 12140 Indian Creek Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 12200 Indian Creek Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 12240 Indian Creek Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1071 Thorndale Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1260-1274 Ellis Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 371-377 Meyer Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 850-880 Devon Ave [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 917 Lone Oak Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2250 Arthur Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6675 Business Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1800 Donaldson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6880 Fairfield Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 7000-7018 Fairfield Business [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2000 Southpointe Dr [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1400 NW 65th Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6500 NW 12th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6501 NW 12th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6600 NW 12th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5400 Alliance Gateway Freeway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 101 Constitution Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 20 Liberty Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 12601 Industry Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 12641 Industry Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 850 S Jupiter Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2510 W Main Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4251 North Highway 121 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2011 Southtech Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1035 N Hilltop Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1549 W Glenlake Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 901 N Hilltop Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 925 N Hilltop Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8241 Sandy Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8242 Sandy Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8246 Sandy Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1305 Chastain Road NW [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1325 Chastain Road NW [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3600 Cobb International Bld NW [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | Unit 1 Bear Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 21 S Middlesex Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4 S Middlesex Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 220 Lake Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 222 Lake Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 4000 E Airport Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2000 Park Oaks Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2212 Taft Vineland Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5905 Trenton Lane North [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6055 Nathan Lane North [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2201-2215 NW 30th Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2250-2270 NW 30th Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2280-2300 NW 30th Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2301-2329 NW 30th Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3000 NW 25th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3001-3037 NW 25th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3012-3050 NW 25th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 8720 Rochester Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1210 Champion Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3990 Heritage Oak Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3654-3668 Swenson Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3701 Illinois Ave [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 3950-3980 Swenson Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1501 102nd Avenue North [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1527 102nd Avenue North [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1551 102nd Avenue North [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6920 Harbour View Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 6950 Harbour View Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1516 Fryar Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 100 Dartmouth Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 100 Gloucester Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 9945 Currie Davis Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1858 E Encanto Dr [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 475 W Vaughn St [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5111 S Royal Atlanta Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 5151 S Royal Atlanta Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2100 M Street NW [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1400 Powis Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 1400 Northpoint Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 300 Northpoint Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 400 Northpoint Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2935 West Corporate Lakes Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 2945 West Corporate Lakes Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 43-47 Hintz Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 10 Cornell Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Maximum [Member] | Operating Properties [Member] | 265 Ballardvale Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 40 years    
Minimum [Member] | Operating Properties [Member] | 1000 South Loop West [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 10241 W Little York Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 10245 W Little York Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2121 Southtech Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 800 Commerce Parkway West Dr [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6600 Business Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2785 Commerce Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8212 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 701 Distribution Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 300 Technology Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 120 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 116 Pleasant Ridge Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1501 Perryman Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 869 S Route 53 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 901 S Route 53 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 400 Nestle Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7248 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7339 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7437 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 700 Nestle Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8014 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 705 Boulder Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 651 Boulder Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8150 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8250 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 650 Boulder Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7165 Ambassador Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 200 Boulder Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 250 Boulder Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8400 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6560 Stonegate Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6370 Hedgewood Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6390 Hedgewood Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6350 Hedgewood Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6330 Hedgewood Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6580 Snowdrift Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6540 Stonegate Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6520 Stonegate Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7620 Cetronia Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 180,190 Cochrane Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4606 Richlynn Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 74 West Broad Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6601-6625 W. 78th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6161 Green Valley Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 10801 Nesbitt Avenue South [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5775 West Old Shakopee Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5715 Old Shakopee Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5735 Old Shakopee Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5705 Old Shakopee Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 951 Broken Sound Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1455 Remington Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 150 E Crossroads Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 553 S Joliet Ave [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 777 Yamato Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 750 Park of Commerce Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 400 Boulder Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8201 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8500 Industrial Bouldvard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 860 Nestle Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1485 W Commerce Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 95 Kriner Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 9000 109th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 11701 Goodrich Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 12810 Virkler Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2700 Hutchinson McDonald Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2701 Hutchinson McDonald Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2730 Hutchinson McDonald Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2801 Hutchinson McDonald Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3000 Crosspoint Center Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3005 Crosspoint Center Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4045 Perimeter West Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4525 Statesville Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4835 Sirona Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4925 Sirona Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5033 Sirona Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8910 Pioneer Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8916 Pioneer Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1309 Executive Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1305 Executive Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1313 Executive Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2601 Indian River Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 500 Independence Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 700 Independence Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1540 S 54th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4650 Lake Forest Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4750 Lake Forest Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 9645 Gerwig Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2550 John Glenn Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3800 Twin Creeks Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 455 Airline Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2130 Baldwin Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 329-333 Herrod Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 501 Independence Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 505 Independence Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 510 Independence Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1301 Executive Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 676 Independence Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1250 Hall Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 301-321 S Goolsby Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1680 Executive Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1700 Executive Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2670 Breckinridge Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 170 Parkway West [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 190 Parkway West [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 265 Parkway East [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 285 Parkway East [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3169 Dodd Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3255 Neil Armstrong Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3711 Kennebec Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 10301-10305 West 70th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 10321 West 70th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 10333 West 70th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 10349-10357 West 70th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 10365-10375 West 70th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 10393-10394 West 70th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 10400 Viking Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7075 Flying Cloud Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7078 Shady Oak Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7615 Smetana Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7625 Smetana Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7695-7699 Anagram Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7777 Golden Triangle Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7800 Equitable Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7905 Fuller Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8855 Columbine Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8911 Columbine Road (B2) [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8937 Columbine Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8967 Columbine Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8995 Columbine Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 9023 Columbine Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7351 Coca Cola Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 21705-21707 Mississippi Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 27143 S Baseline Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 180 Sheree Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 9601 Cosner Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 200 W Cypress Creek Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5410 - 5430 Northwest 33rd Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 45 Brookfield Oaks Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1487 South Highway 101 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2727 London Grove Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 11841 Newgate Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1 Enterprise Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1317 Executive Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 21 Enterprise Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 22 Enterprise Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5 Manhattan Square [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 521 Butler Farm Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1560 Hunter Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1575 Hunter Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7361 Coca Cola Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 500 McCarthy Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 600 Industrial Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7195 Grayson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7253 Grayson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 12537 Cerise Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1010 Petersburg Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 785 Lindbergh Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 805 Lindbergh Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 825 Lindbergh Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 845 Lindbergh Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1498 Eagle Hill Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4183 Eagle Hill Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4189 Eagle Hill Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4195 Eagle Hill Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4328, 4336 Federal Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4344 Federal Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4380 Federal Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4388 Federal Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4475 Premier Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4500 Green Point Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4501 Green Point Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4523 Green Point Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4524 Green Point Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | Unit 5 Logix Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1515 6th Street South [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1600 5th Street South [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 100 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 100 Witmer Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 100-107 Lakeside Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 101 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 101-111 Rock Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 102 Rock Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 103-109 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 104 Witmer Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 110 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 111-159 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 113-123 Rock Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 123-135 Rock Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 132 Welsh Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 161-175 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 181-187 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2 Walnut Grove Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 200 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 200-264 Lakeside Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 201 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 210-223 Witmer Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 220 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 231-237 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 240 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 255 Business Center Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 261-283 Gibraltar Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 300 Welsh Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 300 Welsh Road - Building 3 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 300 Welsh Road - Building 4 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 300-309 Lakeside Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 355 Business Center Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4 Walnut Grove [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 400-445 Lakeside Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 455 Business Center Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5 Walnut Grove Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 506 Prudential Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 555 Business Center Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 680 Blair Mill Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7 Walnut Grove Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 700 Dresher Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 507 Prudential Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 747 Dresher Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 767 Electronic Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 10301 Round Up Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 10305 Round Up Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 10607 Haddington Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 10735 West Little York Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 10739 West Little York Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 11201 Greens Crossing Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 11502 South Main Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1283 N Post Oak Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1287 N Post Oak Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1291 N Post Oak Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1416 N Sam Houston Parkway E [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1420 N Sam Houston Parkway E [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 14200 Hollister Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1424 N Sam Houston Parkway E [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1428 N Sam Houston Parkway E [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 16405 Air Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 16420 West Hardy Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 16445 Air Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1646 Rankin Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1655 Townhurst Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 16580 Air Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 16602 Central Green Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 16605 Air Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1665 Townhurst Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 16680 Central Green Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 16685 Air Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1755 Trans Central Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4301 S Pinemont Dr [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4401 S Pinemont Dr [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4501 S Pinemont Dr [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5200 N. Sam Houston Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5250 N. Sam Houston Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 850 Greens Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 860 Greens Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8801 A-E Wallisville Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8801-19 & 8821-49 Fallbrook Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8802-8824 Fallbrook Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8811 A-E Wallisville Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8825-8839 N Sam Houston Pkwy [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8850-8872 Fallbrook Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 9500-9540 Clay Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 151 South Warner Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 180 South Warner Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2100 Renaissance Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2201 Renaissance Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2300 Renaissance Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2301 Renaissance Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2500 Renaissance Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2520 Renaissance Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2560 Renaissance Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2700 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2900 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3200 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3400 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3600 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3602 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3604 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 440 East Swedesford Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 460 East Swedesford Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 650 Swedesford Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 680 Swedesford Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 170 South Warner Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 190 South Warner Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3000 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3100 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3500 Horizon Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1700 Interstate Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5801 Columbia Park Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 11425 State Highway 225 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 11503 State Highway 225 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 640 S State Road 39 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7528 Walker Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8301 Industrial Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8500 Willard Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 875 Maxham Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2145 Center Square Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7533 Industrial Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1901 Summit Tower Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1 Country View Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 10 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 100 Chesterfield Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1001 Cedar Hollow Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 11 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 11,15 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 18 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2 West Liberty Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 200 Chesterfield Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 27-43 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3 Country View Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 375 Technology Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 40 Liberty Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 425 Technology Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 45 Liberty Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 45-67 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 50 Morehall Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 600 Chesterfield Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 700 Chesterfield Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 10 Valley Stream Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 10, 20 Liberty Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 12,14,16 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 14 Lee Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 155 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 20 Valley Stream Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 257-275 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 277-293 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 30 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 300-400 Chesterfield Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 311 Technology Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 333 Phoenixville Pike [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 40 Valley Stream Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 420 Lapp Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5 Country View Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 50 Valley Stream Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 500 Chesterfield Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 508 Lapp Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 510 Lapp Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 55 Valley Stream Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 60 Morehall Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 65 Valley Stream Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 75 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 77-123 Great Valley Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1169 Canton Rd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 65 Brookfield Oaks Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 75 Brookfield Oaks Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 126-132 Liberty Industrial Pkw [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 95-115 Liberty Industrial Pkwy [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 11401 NW 134th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3824-3960 Crowfarn Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4700 Nathan Lane North [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 12501 & 12701 Whitewater Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 12800 Whitewater Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 12900 Whitewater Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5400-5500 Feltl Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6000 Clearwater Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 456 International Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3100 SW 145th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3350 SW 148th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3400 Lakeside Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3450 Lakeside Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 323 Park Knoll Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 324 Park Knoll Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 619 Distribution Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 627 Distribution Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1879 Lamont Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 350 Winmeyer Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1000 Gills Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 10003 Satellite Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 10511 & 10611 Satellite Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 10771 Palm Bay Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1090 Gills Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1400-1440 Central Florida Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1902 Cypress Lake Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1950 Summit Park Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1958 Summit Park Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 201 Summit Park Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2202 Taft-Vineland Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2256 Taft-Vineland Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2351 Investors Row [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2400 South Lake Orange Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2412 Sand Lake Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2416 Lake Orange Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6200 Lee Vista Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6501 Lee Vista Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6918 Presidents Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6923 Lee Vista Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7022 TPC Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7100 TPC Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7101 TPC Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7315 Kingspointe Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8201 Chancellor Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 851 Gills Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 950 Gills Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 9550 Satellite Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 9600 Satellite Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 9700 Satellite Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 13 Centennial Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1 Crescent Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 12285 McNulty Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 150 Rouse Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3 Crescent Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4300 South 26th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4751 League Island Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4775 League Island Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2626 South 7th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4207 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4217 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4303 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4313 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4405 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4410 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4415 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4425 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4435 E. Cotton Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4610 South 44th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4750 S. 44th Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 563 South 63rd Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 9801 80th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2250 Hickory Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 595 SW 13th Terrace [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 601 SW 13th Terrace [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 605 SW 16th Terrace [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 301 Hill Carter Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4101-4127 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4201-4261 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4263-4299 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4263F-N. Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4301-4335 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4337-4379 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4401-4445 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4447-4491 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4501-4549 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4551-4593 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4601-4643 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4645-4683 Carolina Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4717-4729 Eubank Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 510 Eastpark Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 520 Eastpark Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 530 Eastpark Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 540 Eastpark Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5600-5626 Eastport Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5601-5659 Eastport Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5650-5674 Eastport Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5700 Eastport Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5701-5799 Eastport Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5900 Eastport Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6000 Eastport Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2020 US Highway 301 South [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6530 Judge Adams Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6532 Judge Adams Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 13098 George Weber Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1070 Windham Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1550 Central Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1135 Aviation Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8715 Bollman Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8501 East Raintree Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1150 Gateway Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5555 12th Avenue East [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6900 Harbor View Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1301 International Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 13621 NW 12th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 13630 NW 8th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 13650 NW 8th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 111 Kelsey Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 131 Kelsey Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 150-182 Kelsey Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 200-34 Kelsey Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3102,3104,3110 Cherry Palm Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3401-3409 Cragmont Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3502 Roga Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3505 Cragmont Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3608 Queen Palm Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4502 Woodland Corporate Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4503 Woodland Corporate Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4505 Woodland Corporate Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4508 Woodland Corporate Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4511 Woodland Corporate Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4520 Seedling Circle [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4630 Woodland Corporate Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4631 Woodland Corporate Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 501 US Highway 301 South [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5250 Eagle Trail Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5501-5519 Pioneer Park Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5690-5694 Crenshaw Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 701-725 South US Hwy 301 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7621 Bald Cypress Place (Bldg N) [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7724 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7725 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7802-50 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7851-7861 Woodland Center Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7852-98 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7920 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7930, 8010-20 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8001 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8110 Anderson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8112-42 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8130 Anderson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8154-8198 Woodland Center Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8401-8408 Benjamin Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8705 Henderson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8715 Henderson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8725 Henderson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8735 Henderson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8745 Henderson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8900-34 Brittany Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8921 Brittany Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 9001-9015 Brittany Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 9002-9036 Brittany Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 901-933 US Highway 301 South [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 9020 King Palm [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 910-926 Chad Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 9110 King Palm Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 9203 King Palm Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 9306-24 East Broadway Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 9319 Peach Palm Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 9704 Solar Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 921 South Park Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8313 West Pierce Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8591 West Washington [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8601 West Washington [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1457 Miller Store Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 200 Golden Oak Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 208 Golden Oak Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2809 South Lynnhaven Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 484 Viking Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 629 Phoenix Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1100 17th Street NW [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1200 Liberty Ridge Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1500 Liberty Ridge [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 825 Duportail Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 400-500 Brandywine Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 600 Brandywine Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1 Kings Hill Aveune [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 42 Kings Hill Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | Liberty Square Retail Blocks [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 40 Logistics Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 135-195 East Elk Trail [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 515 Kehoe Boulevard [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1413 Bradley Lane [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3200 Belmeade Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1475 Nitterhouse Dr [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 14400 Hollister Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 15102 Sommermeyer St [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 15150 Sommermeyer St [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | Liberty 11 at Central Green [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | Cabot III UK1B01 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1011 N Hilltop Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4047 Perimeter West Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5500 N. Sam Houston Parkway West [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5910 West by Northwest Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8017 Pinemont Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8272 El Rio Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8282 El Rio Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8301 Fallbrook Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4000 S 26th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4050 S 26th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5 Crescent Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8th & Walnut Streets [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | Cotton Center Building 18 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1000 Klein Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1901 10th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1909 10th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3605 East Plano Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3701 East Plano Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 800 Klein Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 900 Klein Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4450 South 44th Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 9801 South 51st Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3095 Presidential Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3097 Presidential Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7030 Buford Highway NE [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | Barton 150 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1055-1071 Kingsland Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 11800 Baltimore Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 11850 Baltimore Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 11900 Baltimore Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 12104 Indian Creek Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 12140 Indian Creek Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 12200 Indian Creek Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 12240 Indian Creek Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1071 Thorndale Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1260-1274 Ellis Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 371-377 Meyer Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 850-880 Devon Ave [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 917 Lone Oak Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2250 Arthur Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6675 Business Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1800 Donaldson Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6880 Fairfield Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 7000-7018 Fairfield Business [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2000 Southpointe Dr [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1400 NW 65th Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6500 NW 12th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6501 NW 12th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6600 NW 12th Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5400 Alliance Gateway Freeway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 101 Constitution Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 20 Liberty Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 12601 Industry Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 12641 Industry Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 850 S Jupiter Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2510 W Main Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4251 North Highway 121 [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2011 Southtech Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1035 N Hilltop Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1549 W Glenlake Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 901 N Hilltop Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 925 N Hilltop Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8241 Sandy Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8242 Sandy Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8246 Sandy Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1305 Chastain Road NW [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1325 Chastain Road NW [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3600 Cobb International Bld NW [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | Unit 1 Bear Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 21 S Middlesex Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4 S Middlesex Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 220 Lake Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 222 Lake Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 4000 E Airport Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2000 Park Oaks Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2212 Taft Vineland Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 8720 Rochester Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1210 Champion Way [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3990 Heritage Oak Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3654-3668 Swenson Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3701 Illinois Ave [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 3950-3980 Swenson Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1501 102nd Avenue North [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1527 102nd Avenue North [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1551 102nd Avenue North [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6920 Harbour View Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 6950 Harbour View Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1516 Fryar Avenue [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 100 Dartmouth Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 100 Gloucester Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 9945 Currie Davis Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1858 E Encanto Dr [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 475 W Vaughn St [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5111 S Royal Atlanta Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 5151 S Royal Atlanta Drive [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2100 M Street NW [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1400 Powis Court [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 1400 Northpoint Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 300 Northpoint Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 400 Northpoint Parkway [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2935 West Corporate Lakes Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 2945 West Corporate Lakes Blvd [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 43-47 Hintz Road [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 10 Cornell Place [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
Minimum [Member] | Operating Properties [Member] | 265 Ballardvale Street [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Life Used for Depreciation 5 years    
[1] Denotes property is collateralized under mortgages with Allianz, John Hancock, LaSalle Bank, Aviva, New York Life and Wells Fargo totaling $475.8 million.