XML 140 R119.htm IDEA: XBRL DOCUMENT v3.3.1.900
Schedule III (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Malvern, PA      
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,074,558,000 $ 6,704,262,000 $ 5,369,861,000 $ 7,014,490,000
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,182,129,000 1,051,340,000 1,067,205,000 1,148,928,000
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,074,558,000 6,704,262,000 5,369,861,000  
Real Estate Additions 562,299,000 602,585,000 1,888,229,000  
Real Estate, Cost of Real Estate Sold (622,367,000) (232,289,000) (553,828,000)  
Real Estate, Gross 7,014,490,000 7,074,558,000 6,704,262,000  
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation 1,182,129,000 1,051,340,000 1,067,205,000  
Real Estate Accumulated Depreciation, Depreciation Expense 182,011,000 179,143,000 162,546,000  
Real Estate Accumulated Depreciation, Real Estate Sold (215,212,000) (48,354,000) (178,411,000)  
Real Estate Accumulated Depreciation 1,148,928,000 $ 1,182,129,000 $ 1,051,340,000  
Allianz, John Hancock, LaSalle Bank, Athene, New York Life and Wells Fargo [Member] [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Amount of Encumbrances       232,100,000
Total Real Estate [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Amount of Encumbrances [1]       55,484,649
Real Estate and Accumulated Depreciation, Initial Cost of Land       1,501,956,884
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       2,652,302,317
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       2,844,417,302
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,521,894,052
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,492,595,513
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 7,014,489,565     7,014,489,565
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,148,928,324     1,148,928,324
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross 7,014,489,565      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,148,928,324      
Maximum [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Minimum [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
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 [3]       0
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 [2]       596,652
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,061,632
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,748,500
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,810,132     6,810,132
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,475,427     1,475,427
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,810,132      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,475,427      
Operating Properties [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 [2]       35,346,705
Real Estate and Accumulated Depreciation, Carrying Amount of Land       12,334,030
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       35,065,310
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 47,399,340     47,399,340
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,369,265     1,369,265
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 47,399,340      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,369,265      
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 [2]       5,422,539
Real Estate and Accumulated Depreciation, Carrying Amount of Land       5,816,839
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       24,293,083
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 30,109,922     30,109,922
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 5,910,950     5,910,950
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 30,109,922      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 5,910,950      
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 [2]       61,258
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,194,223
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,263,140
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,457,363     5,457,363
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 297,229     297,229
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,457,363      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 297,229      
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 [2]       661,947
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,055,066
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,646,040
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,701,106     8,701,106
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 431,780     431,780
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,701,106      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 431,780      
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 [2]       902,672
Real Estate and Accumulated Depreciation, Carrying Amount of Land       4,722,683
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       19,825,317
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 24,548,000     24,548,000
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 5,621,980     5,621,980
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 24,548,000      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 5,621,980      
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]       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     17,848,403
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,657,632     4,657,632
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 $ 4,657,632      
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 [2]       27,960,348
Real Estate and Accumulated Depreciation, Carrying Amount of Land       8,184,096
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       27,841,752
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 36,025,848     36,025,848
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 14,183,487     14,183,487
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 36,025,848      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 14,183,487      
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
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 [2]       32,159,603
Real Estate and Accumulated Depreciation, Carrying Amount of Land       9,961,788
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       27,406,063
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 37,367,851     37,367,851
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 9,049,776     9,049,776
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 37,367,851      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 9,049,776      
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 [2]       17,738,622
Real Estate and Accumulated Depreciation, Carrying Amount of Land       4,308,646
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       17,738,622
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 22,047,268     22,047,268
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 8,117,529     8,117,529
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 22,047,268      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 8,117,529      
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
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 [2]       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     23,659,440
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 10,049,517     10,049,517
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 $ 10,049,517      
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
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 [2]       28,652,353
Real Estate and Accumulated Depreciation, Carrying Amount of Land       10,596,767
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       28,649,613
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 39,246,380     39,246,380
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 12,616,449     12,616,449
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 39,246,380      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 12,616,449      
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 [3]       0
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 [2]       4,644,609
Real Estate and Accumulated Depreciation, Carrying Amount of Land       804,848
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,632,760
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,437,608     5,437,608
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,884,477     1,884,477
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,437,608      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,884,477      
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 [2]       4,712,185
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,670,673
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       18,019,769
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 20,690,442     20,690,442
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 8,443,302     8,443,302
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 20,690,442      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 8,443,302      
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 [2]       7,592,257
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,197,447
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,582,586
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,780,033     8,780,033
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,650,841     3,650,841
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1996      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,780,033      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,650,841      
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 [2]       3,377,718
Real Estate and Accumulated Depreciation, Carrying Amount of Land       726,651
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       8,390,967
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 9,117,618     9,117,618
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,969,096     4,969,096
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1976      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,117,618      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 4,969,096      
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
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 [2]       9,909,602
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,645,117
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,283,743
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 13,928,860     13,928,860
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,893,825     4,893,825
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 13,928,860      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 4,893,825      
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 [2]       9,396,095
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,571,466
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       9,388,796
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 11,960,262     11,960,262
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,148,626     3,148,626
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 11,960,262      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,148,626      
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 [2]       5,082,558
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,035,854
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,072,371
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,108,225     6,108,225
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,696,937     1,696,937
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,108,225      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,696,937      
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
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 [2]       27,161,555
Real Estate and Accumulated Depreciation, Carrying Amount of Land       7,521,211
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       26,366,292
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 33,887,503     33,887,503
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 6,758,180     6,758,180
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 33,887,503      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 6,758,180      
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 [2]       6,060,145
Real Estate and Accumulated Depreciation, Carrying Amount of Land       532,047
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,059,366
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,591,413     6,591,413
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,620,745     3,620,745
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,591,413      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,620,745      
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 [2]       4,526,060
Real Estate and Accumulated Depreciation, Carrying Amount of Land       560,691
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,325,396
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,886,087     4,886,087
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,309,215     2,309,215
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,886,087      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,309,215      
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 [2]       4,019,260
Real Estate and Accumulated Depreciation, Carrying Amount of Land       541,459
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,018,596
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,560,055     4,560,055
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,279,429     2,279,429
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,560,055      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,279,429      
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 [2]       3,018,919
Real Estate and Accumulated Depreciation, Carrying Amount of Land       707,867
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,018,255
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,726,122     3,726,122
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,813,455     1,813,455
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,726,122      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,813,455      
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 [2]       1,873,771
Real Estate and Accumulated Depreciation, Carrying Amount of Land       484,361
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,842,725
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,327,086     2,327,086
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 992,068     992,068
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1996      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,327,086      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 992,068      
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 [2]       4,073,406
Real Estate and Accumulated Depreciation, Carrying Amount of Land       422,730
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,072,718
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,495,448     4,495,448
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,759,797     2,759,797
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,495,448      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,759,797      
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]       2,858,752
Real Estate and Accumulated Depreciation, Carrying Amount of Land       458,945
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,858,088
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,317,033     3,317,033
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,969,167     1,969,167
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,317,033      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,969,167      
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 [2]       4,876,767
Real Estate and Accumulated Depreciation, Carrying Amount of Land       389,081
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,876,014
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,265,095     5,265,095
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,828,651     2,828,651
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,265,095      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,828,651      
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 [2]       445,980
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,093,724
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,295,518
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,389,242     5,389,242
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,148,035     2,148,035
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,389,242      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,148,035      
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 [2]       216,941
Real Estate and Accumulated Depreciation, Carrying Amount of Land       200,351
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,946,102
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,146,453     2,146,453
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 148,824     148,824
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,146,453      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 148,824      
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 [2]       86,553
Real Estate and Accumulated Depreciation, Carrying Amount of Land       188,680
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,807,601
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,996,281     1,996,281
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 148,512     148,512
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,996,281      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 148,512      
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 [3]       0
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 [2]       940,852
Real Estate and Accumulated Depreciation, Carrying Amount of Land       919,850
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,992,192
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,912,042     5,912,042
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 428,292     428,292
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,912,042      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 428,292      
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 [2]       (1,742,245)
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,955,326
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       12,143,365
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 14,098,691     14,098,691
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 786,014     786,014
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 14,098,691      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 786,014      
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 [2]       326,403
Real Estate and Accumulated Depreciation, Carrying Amount of Land       727,294
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,693,932
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,421,226     3,421,226
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 235,638     235,638
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,421,226      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 235,638      
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 [2]       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     2,831,249
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,041,001     1,041,001
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 $ 1,041,001      
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
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 [2]       373,362
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,769,962
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,202,391
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,972,353     4,972,353
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 208,719     208,719
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,972,353      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 208,719      
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
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 [2]       277,582
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,595,044
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,692,714
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,287,758     6,287,758
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 333,699     333,699
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,287,758      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 333,699      
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
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 [2]       480,354
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,492,036
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,504,392
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,996,428     5,996,428
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 358,357     358,357
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,996,428      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 358,357      
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
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 [2]       391,474
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,021,752
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,895,276
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,917,028     4,917,028
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 397,647     397,647
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,917,028      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 397,647      
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
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 [2]       612,557
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,347,882
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,072,848
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,420,730     3,420,730
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 157,679     157,679
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,420,730      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 157,679      
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
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 [2]       552,121
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,479,307
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,712,119
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,191,426     4,191,426
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 211,434     211,434
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,191,426      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 211,434      
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 [2]       174,978
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,016,715
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,612,057
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,628,772     4,628,772
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 247,640     247,640
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,628,772      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 247,640      
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 [3]       0
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 [2]       360,126
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,298,560
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,380,508
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,679,068     6,679,068
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 403,950     403,950
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,679,068      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 403,950      
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 [3]       0
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 [2]       301,673
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,903,423
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,865,626
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,769,049     5,769,049
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 360,978     360,978
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,769,049      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 360,978      
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 [3]       0
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 [2]       693,361
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,958,756
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       8,652,374
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 11,611,130     11,611,130
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 709,605     709,605
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 11,611,130      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 709,605      
Operating Properties [Member] | 10 Emery 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       5,591,216
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       32,941,818
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       7,229,427
Real Estate and Accumulated Depreciation, Carrying Amount of Land       8,945,327
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       36,817,134
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 45,762,461     45,762,461
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,410,917     1,410,917
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 45,762,461      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,410,917      
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 [2]       46,707,077
Real Estate and Accumulated Depreciation, Carrying Amount of Land       12,009,985
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       46,658,715
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 58,668,700     58,668,700
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,031,218     3,031,218
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 58,668,700      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,031,218      
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 [2]       14,540,256
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,099,079
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       14,537,304
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 15,636,383     15,636,383
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 6,410,073     6,410,073
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 15,636,383      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 6,410,073      
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 [2]       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     5,794,796
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,851,425     1,851,425
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 $ 1,851,425      
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 [2]       6,276,164
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,148,571
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,240,816
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,389,387     8,389,387
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,115,865     2,115,865
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,389,387      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,115,865      
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]       2,316,756
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,264,758
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,676,006
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,940,764     5,940,764
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,939,380     1,939,380
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,940,764      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,939,380      
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 [2]       1,006,356
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,264,758
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,365,606
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,630,364     4,630,364
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,105,007     1,105,007
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,630,364      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,105,007      
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 [2]       1,676,375
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,060,644
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,517,398
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,578,042     7,578,042
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,251,291     2,251,291
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,578,042      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,251,291      
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]       1,680,574
Real Estate and Accumulated Depreciation, Carrying Amount of Land       709,961
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,022,593
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,732,554     5,732,554
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,271,251     2,271,251
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1992      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,732,554      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,271,251      
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 [2]       42,098,480
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,310,246
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       42,051,294
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 44,361,540     44,361,540
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 17,834,890     17,834,890
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 44,361,540      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 17,834,890      
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 [2]       22,337,738
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,473,406
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       22,294,332
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 24,767,738     24,767,738
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,985,949     3,985,949
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 24,767,738      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,985,949      
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 [2]       5,344,482
Real Estate and Accumulated Depreciation, Carrying Amount of Land       4,501,247
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       21,021,829
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 25,523,076     25,523,076
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 8,875,993     8,875,993
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1987      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 25,523,076      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 8,875,993      
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 [2]       2,001,056
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,426,251
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       8,100,008
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 9,526,259     9,526,259
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,964,177     3,964,177
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1986      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,526,259      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,964,177      
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 [2]       1,170
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,501,294
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,705,889
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 13,207,183     13,207,183
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 879,209     879,209
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 13,207,183      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 879,209      
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 [3]       0
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 [2]       1,124,578
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,078,949
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       15,267,955
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 18,346,904     18,346,904
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,166,216     1,166,216
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 18,346,904      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,166,216      
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 [3]       0
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 [2]       1,296,625
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,764,831
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       16,406,572
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 20,171,403     20,171,403
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,508,882     1,508,882
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 20,171,403      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,508,882      
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 [2]       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     13,458,721
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,094,910     3,094,910
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 $ 3,094,910      
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
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 [2]       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     10,443,629
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,038,762     2,038,762
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 $ 2,038,762      
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 [2]       39,866,096
Real Estate and Accumulated Depreciation, Carrying Amount of Land       11,511,499
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       37,107,305
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 48,618,804     48,618,804
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 9,089,031     9,089,031
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 48,618,804      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 9,089,031      
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 [2]       7,417,175
Real Estate and Accumulated Depreciation, Carrying Amount of Land       8,118,881
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       26,302,661
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 34,421,542     34,421,542
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 8,792,764     8,792,764
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 34,421,542      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 8,792,764      
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]       2,344,063
Real Estate and Accumulated Depreciation, Carrying Amount of Land       4,095,262
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       16,384,708
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 20,479,970     20,479,970
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 6,043,883     6,043,883
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 20,479,970      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 6,043,883      
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 [2]       33,008,825
Real Estate and Accumulated Depreciation, Carrying Amount of Land       8,081,272
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       32,909,403
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 40,990,675     40,990,675
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,013,072     3,013,072
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 40,990,675      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,013,072      
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 [2]       594,561
Real Estate and Accumulated Depreciation, Carrying Amount of Land       4,873,094
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       13,024,881
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 17,897,975     17,897,975
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 694,475     694,475
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 17,897,975      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 694,475      
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 [2]       203,950
Real Estate and Accumulated Depreciation, Carrying Amount of Land       5,523,427
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       14,785,655
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 20,309,082     20,309,082
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 943,841     943,841
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 20,309,082      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 943,841      
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 [3]       0
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 [2]       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     2,359,322
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 176,999     176,999
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 $ 176,999      
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 [2]       414,235
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,042,453
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       8,442,209
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 9,484,662     9,484,662
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 634,295     634,295
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,484,662      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 634,295      
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]       2,091,556
Real Estate and Accumulated Depreciation, Carrying Amount of Land       7,081,007
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       41,093,567
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 48,174,574     48,174,574
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,258,216     3,258,216
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 48,174,574      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,258,216      
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 [2]       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     43,622,090
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 6,917,933     6,917,933
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 $ 6,917,933      
Operating Properties [Member] | 9000 109th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Champlain, MN      
Real Estate and Accumulated Depreciation, Amount of Encumbrances [3]       0
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 [2]       119,919
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,251,043
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       11,782,914
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 13,033,957     13,033,957
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,473,425     1,473,425
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 13,033,957      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,473,425      
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 [2]       817,623
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,054,621
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,173,773
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 9,228,394     9,228,394
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,015,254     1,015,254
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,228,394      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,015,254      
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 [2]       738,197
Real Estate and Accumulated Depreciation, Carrying Amount of Land       476,262
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,104,888
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,581,150     3,581,150
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 380,450     380,450
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2010      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,581,150      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 380,450      
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 [2]       309,842
Real Estate and Accumulated Depreciation, Carrying Amount of Land       912,500
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,031,101
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,943,601     5,943,601
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 613,658     613,658
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,943,601      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 613,658      
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 [2]       630,260
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,275,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,280,010
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,555,010     6,555,010
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 666,561     666,561
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,555,010      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 666,561      
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 [2]       43,022
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,878,750
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,172,521
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 12,051,271     12,051,271
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,162,053     1,162,053
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 12,051,271      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,162,053      
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 [2]       213,916
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,065,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,189,166
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,254,166     8,254,166
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 872,805     872,805
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,254,166      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 872,805      
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 [2]       1,032,234
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,831,250
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       11,811,646
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 13,642,896     13,642,896
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,371,005     1,371,005
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 13,642,896      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,371,005      
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 [2]       665,107
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,990,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,226,647
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 9,216,647     9,216,647
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 780,369     780,369
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,216,647      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 780,369      
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 [2]       (52,318)
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,418,928
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,458,732
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,877,660     8,877,660
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 970,146     970,146
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,877,660      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 970,146      
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 [2]       6,399,096
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,279,004
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,399,096
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,678,100     7,678,100
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 688,283     688,283
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,678,100      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 688,283      
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 [2]       316,750
Real Estate and Accumulated Depreciation, Carrying Amount of Land       837,144
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,600,171
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,437,315     6,437,315
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 654,702     654,702
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,437,315      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 654,702      
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 [1]       3,210,583
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 [2]       102,104
Real Estate and Accumulated Depreciation, Carrying Amount of Land       690,750
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,188,492
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,879,242     5,879,242
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 474,733     474,733
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,879,242      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 474,733      
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 [1]       3,238,688
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 [2]       107,476
Real Estate and Accumulated Depreciation, Carrying Amount of Land       603,003
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,076,487
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,679,490     5,679,490
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 544,133     544,133
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,679,490      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 544,133      
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 [1]       2,622,886
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 [2]       166,524
Real Estate and Accumulated Depreciation, Carrying Amount of Land       613,962
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,772,027
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,385,989     5,385,989
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 455,174     455,174
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,385,989      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 455,174      
Operating Properties [Member] | 5039 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       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       1,027,500
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       6,172,807
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       23,107
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,027,500
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,195,914
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,223,414     7,223,414
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 197,115     197,115
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,223,414      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 197,115      
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 [2]       (21,446)
Real Estate and Accumulated Depreciation, Carrying Amount of Land       527,873
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,937,760
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,465,633     5,465,633
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 497,449     497,449
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,465,633      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 497,449      
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 [2]       347,238
Real Estate and Accumulated Depreciation, Carrying Amount of Land       557,730
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,132,571
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,690,301     6,690,301
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 719,728     719,728
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,690,301      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 719,728      
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 [3]       0
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 [2]       437,088
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,711,746
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,855,120
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 12,566,866     12,566,866
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 885,048     885,048
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 12,566,866      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 885,048      
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 [2]       928,916
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,540,236
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       21,059,468
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 24,599,704     24,599,704
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,581,479     1,581,479
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 24,599,704      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,581,479      
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 [2]       233,667
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,030,242
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,236,690
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,266,932     5,266,932
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 357,652     357,652
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,266,932      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 357,652      
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 [2]       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     7,250,625
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 523,185     523,185
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 $ 523,185      
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 [2]       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     8,697,579
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 578,261     578,261
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 $ 578,261      
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 [2]       869,575
Real Estate and Accumulated Depreciation, Carrying Amount of Land       540,601
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,998,917
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,539,518     6,539,518
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 406,007     406,007
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,539,518      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 406,007      
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 [2]       491,170
Real Estate and Accumulated Depreciation, Carrying Amount of Land       549,393
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,134,472
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,683,865     5,683,865
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 362,302     362,302
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,683,865      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 362,302      
Operating Properties [Member] | 330 South Royal Lane [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
Real Estate and Accumulated Depreciation, Initial Cost of Land       2,091,426
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       11,002,754
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,091,426
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       11,002,754
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 13,094,180     13,094,180
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 65,097     65,097
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 13,094,180      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 65,097      
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 [3]       0
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 [2]       742,190
Real Estate and Accumulated Depreciation, Carrying Amount of Land       312,701
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,053,721
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,366,422     3,366,422
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 394,388     394,388
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,366,422      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 394,388      
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 [2]       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     10,941,721
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 626,318     626,318
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 $ 626,318      
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 [3]       0
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 [2]       2,285,014
Real Estate and Accumulated Depreciation, Carrying Amount of Land       4,039,559
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       23,148,065
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 27,187,624     27,187,624
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,701,158     1,701,158
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 27,187,624      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,701,158      
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       0
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 [2]       120,899
Real Estate and Accumulated Depreciation, Carrying Amount of Land       831,611
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,897,185
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,728,796     5,728,796
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,178,012     1,178,012
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,728,796      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,178,012      
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 [2]       184,573
Real Estate and Accumulated Depreciation, Carrying Amount of Land       498,136
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,965,753
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,463,889     3,463,889
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 197,893     197,893
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,463,889      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 197,893      
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 [2]       573,627
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,928,412
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,225,446
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,153,858     7,153,858
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 586,154     586,154
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,153,858      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 586,154      
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 [2]       458,767
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,082,072
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,955,366
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,037,438     4,037,438
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 348,680     348,680
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,037,438      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 348,680      
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 [2]       568,647
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,676,415
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,136,240
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,812,655     6,812,655
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 416,765     416,765
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,812,655      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 416,765      
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 [2]       474,682
Real Estate and Accumulated Depreciation, Carrying Amount of Land       598,918
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,117,868
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,716,786     4,716,786
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,085,855     1,085,855
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,716,786      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,085,855      
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 [2]       251,300
Real Estate and Accumulated Depreciation, Carrying Amount of Land       552,211
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,561,744
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,113,955     4,113,955
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 871,587     871,587
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,113,955      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 871,587      
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 [2]       193,199
Real Estate and Accumulated Depreciation, Carrying Amount of Land       902,374
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,943,658
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,846,032     6,846,032
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,753,633     1,753,633
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,846,032      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,753,633      
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 [2]       360,530
Real Estate and Accumulated Depreciation, Carrying Amount of Land       976,393
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,211,560
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,187,953     7,187,953
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,558,582     1,558,582
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,187,953      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,558,582      
Operating Properties [Member] | 1000 Parliament Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Durham, NC      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       2,229,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       7,064,506
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       81,890
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,229,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,146,396
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 9,375,396     9,375,396
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 334,717     334,717
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,375,396      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 334,717      
Operating Properties [Member] | 4226 Surles Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Durham, NC      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       1,440,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       7,932,265
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       130,771
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,440,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       8,063,036
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 9,503,036     9,503,036
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 449,066     449,066
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,503,036      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 449,066      
Operating Properties [Member] | 4227 Surles Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Durham, NC      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       1,500,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       5,624,030
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       74,695
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,500,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,698,724
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,198,724     7,198,724
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 249,153     249,153
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,198,724      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 249,153      
Operating Properties [Member] | 4234 Surles Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Durham, NC      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       1,440,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       7,356,161
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       (4,933)
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,440,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,351,228
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,791,228     8,791,228
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 395,115     395,115
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,791,228      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 395,115      
Operating Properties [Member] | 4300 Emperor Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Durham, NC      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       1,576,500
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       4,240,961
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       114,080
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,576,500
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,355,041
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,931,541     5,931,541
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 215,916     215,916
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,931,541      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 215,916      
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 [2]       1,566
Real Estate and Accumulated Depreciation, Carrying Amount of Land       988,594
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,588,473
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,577,067     7,577,067
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 733,028     733,028
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,577,067      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 733,028      
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 [2]       313,808
Real Estate and Accumulated Depreciation, Carrying Amount of Land       999,702
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,356,397
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,356,099     5,356,099
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 768,996     768,996
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,356,099      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 768,996      
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 [3]       0
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 [2]       719,188
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,493,115
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,839,643
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,332,758     8,332,758
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 709,824     709,824
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,332,758      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 709,824      
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 [2]       310,312
Real Estate and Accumulated Depreciation, Carrying Amount of Land       118,300
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,397,860
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,516,160     1,516,160
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 587,445     587,445
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1984      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,516,160      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 587,445      
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 [2]       578,495
Real Estate and Accumulated Depreciation, Carrying Amount of Land       142,399
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,886,994
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,029,393     2,029,393
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 816,454     816,454
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1984      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,029,393      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 816,454      
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 [2]       333,454
Real Estate and Accumulated Depreciation, Carrying Amount of Land       108,610
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,331,458
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,440,068     1,440,068
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 567,078     567,078
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1984      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,440,068      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 567,078      
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 [2]       900,007
Real Estate and Accumulated Depreciation, Carrying Amount of Land       270,584
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,386,992
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,657,576     3,657,576
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,603,975     1,603,975
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,657,576      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,603,975      
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 [2]       1,530,128
Real Estate and Accumulated Depreciation, Carrying Amount of Land       285,464
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,153,935
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,439,399     4,439,399
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,596,638     1,596,638
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,439,399      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,596,638      
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 [2]       2,319,934
Real Estate and Accumulated Depreciation, Carrying Amount of Land       264,419
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,748,451
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,012,870     5,012,870
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,600,330     1,600,330
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,012,870      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,600,330      
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 [2]       23,674,446
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,938,372
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       23,648,465
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 26,586,837     26,586,837
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 10,860,957     10,860,957
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 26,586,837      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 10,860,957      
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 [2]       1,408,606
Real Estate and Accumulated Depreciation, Carrying Amount of Land       10,243,977
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       12,253,310
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 22,497,287     22,497,287
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,424,879     2,424,879
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 22,497,287      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,424,879      
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 [2]       1,528,369
Real Estate and Accumulated Depreciation, Carrying Amount of Land       336,481
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,620,776
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,957,257     4,957,257
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,237,010     2,237,010
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,957,257      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,237,010      
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       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       9,043,293
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,000,555
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,054,255
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 10,054,810     10,054,810
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,778,882     2,778,882
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 10,054,810      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,778,882      
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 [2]       3,411,028
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,916,609
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,995,060
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,911,669     7,911,669
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,577,903     1,577,903
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,911,669      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,577,903      
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 [2]       1,204,632
Real Estate and Accumulated Depreciation, Carrying Amount of Land       760,525
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,459,390
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,219,915     5,219,915
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,315,503     2,315,503
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,219,915      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,315,503      
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 [2]       1,299,413
Real Estate and Accumulated Depreciation, Carrying Amount of Land       993,101
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,436,274
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,429,375     4,429,375
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,545,239     1,545,239
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,429,375      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,545,239      
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 [2]       545,644
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,188,525
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,334,405
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,522,930     6,522,930
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,753,415     1,753,415
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1993      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,522,930      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,753,415      
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 [2]       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     7,285,165
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,491,555     3,491,555
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 $ 3,491,555      
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       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       5,199,574
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,599,757
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,000,742
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,600,499     6,600,499
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,448,477     1,448,477
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,600,499      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,448,477      
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       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       4,465,073
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,718,407
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,663,353
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,381,760     5,381,760
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,135,266     1,135,266
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,381,760      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,135,266      
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       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       5,872,477
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,739,966
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,458,340
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,198,306     7,198,306
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,690,162     1,690,162
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,198,306      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,690,162      
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 [2]       4,536,312
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,450,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,536,312
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,986,312     5,986,312
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,720,545     1,720,545
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,986,312      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,720,545      
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       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       4,610,464
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,055,296
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,642,762
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,698,058     5,698,058
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,261,670     1,261,670
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,698,058      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,261,670      
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 [2]       6,217,735
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,956,273
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,217,735
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,174,008     8,174,008
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,480,335     2,480,335
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,174,008      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,480,335      
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 [2]       110,769
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,403,196
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,497,165
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,900,361     3,900,361
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 201,931     201,931
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,900,361      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 201,931      
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 [2]       649,715
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,680,220
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       15,321,625
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 19,001,845     19,001,845
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,019,695     1,019,695
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 19,001,845      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,019,695      
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 [3]       0
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 [2]       421,361
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,421,854
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,151,553
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 12,573,407     12,573,407
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 687,926     687,926
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 12,573,407      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 687,926      
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 [2]       7,288,821
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,023,417
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,162,448
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 9,185,865     9,185,865
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,640,052     1,640,052
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,185,865      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,640,052      
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 [2]       895,205
Real Estate and Accumulated Depreciation, Carrying Amount of Land       10,594,259
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       31,225,008
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 41,819,267     41,819,267
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,644,519     3,644,519
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 41,819,267      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,644,519      
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 [2]       318,163
Real Estate and Accumulated Depreciation, Carrying Amount of Land       6,022,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,931,097
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 11,953,097     11,953,097
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 755,221     755,221
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 11,953,097      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 755,221      
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 [2]       653,387
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       13,864,991
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 13,864,991     13,864,991
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,037,866     2,037,866
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 13,864,991      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,037,866      
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]       2,496,920
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,649,426
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       13,829,758
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 16,479,184     16,479,184
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,777,650     3,777,650
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 16,479,184      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,777,650      
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 [2]       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     3,516,058
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 235,064     235,064
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 $ 235,064      
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 [2]       87,643
Real Estate and Accumulated Depreciation, Carrying Amount of Land       367,925
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,293,460
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,661,385     2,661,385
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 185,674     185,674
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,661,385      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 185,674      
Operating Properties [Member] | 10721 Jasmine Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Fontana, CA      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       11,427,061
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       23,784,779
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       1,682,426
Real Estate and Accumulated Depreciation, Carrying Amount of Land       11,427,061
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       25,467,205
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 36,894,266     36,894,266
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 390,283     390,283
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 36,894,266      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 390,283      
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 [2]       508,486
Real Estate and Accumulated Depreciation, Carrying Amount of Land       756,221
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       9,624,112
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 10,380,333     10,380,333
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 770,103     770,103
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 10,380,333      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 770,103      
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
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 [2]       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     3,151,809
Real Estate and Accumulated Depreciation, Accumulated Depreciation 179,068     179,068
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 $ 179,068      
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
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 [2]       312,146
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,376,880
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,376,880     3,376,880
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 275,900     275,900
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,376,880      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 275,900      
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 [2]       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     3,249,447
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 198,088     198,088
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 $ 198,088      
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
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 [2]       189,131
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,177,312
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,177,312     3,177,312
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 262,429     262,429
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,177,312      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 262,429      
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 [2]       417,705
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,515,860
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,127,823
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,643,683     8,643,683
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 699,894     699,894
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,643,683      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 699,894      
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 [2]       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     4,635,091
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,142,481     2,142,481
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 $ 2,142,481      
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 [2]       1,948,374
Real Estate and Accumulated Depreciation, Carrying Amount of Land       625,111
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,103,277
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,728,388     6,728,388
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,708,183     2,708,183
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,728,388      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,708,183      
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 [2]       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     3,207,358
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 166,449     166,449
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 $ 166,449      
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 [2]       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     6,438,848
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 221,193     221,193
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 $ 221,193      
Operating Properties [Member] | 12681-12691 Pala Drive [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       5,221,102
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       3,225,596
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       83,450
Real Estate and Accumulated Depreciation, Carrying Amount of Land       5,220,148
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,310,000
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,530,148     8,530,148
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 162,254     162,254
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,530,148      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 162,254      
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 [2]       442,326
Real Estate and Accumulated Depreciation, Carrying Amount of Land       799,707
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,564,391
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,364,098     7,364,098
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 501,325     501,325
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,364,098      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 501,325      
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 [3]       0
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 [2]       988,249
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,785,741
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       12,147,067
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 13,932,808     13,932,808
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,226,296     1,226,296
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 13,932,808      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,226,296      
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 [3]       0
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 [2]       422,135
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,165,780
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       8,221,404
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 9,387,184     9,387,184
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 696,539     696,539
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,387,184      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 696,539      
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 [2]       14,182,834
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,712,683
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       12,017,962
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 15,730,645     15,730,645
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,299,069     2,299,069
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 15,730,645      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,299,069      
Operating Properties [Member] | 25 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       288,823
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       3,441,512
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       43,182
Real Estate and Accumulated Depreciation, Carrying Amount of Land       288,823
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,484,694
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,773,517     3,773,517
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 252,214     252,214
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,773,517      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 252,214      
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 [2]       4,470,587
Real Estate and Accumulated Depreciation, Carrying Amount of Land       825,529
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,463,172
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,288,701     5,288,701
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,000,248     1,000,248
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,288,701      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,000,248      
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 [2]       325,468
Real Estate and Accumulated Depreciation, Carrying Amount of Land       223,702
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,899,610
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,123,312     4,123,312
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 358,722     358,722
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,123,312      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 358,722      
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 [2]       412,167
Real Estate and Accumulated Depreciation, Carrying Amount of Land       272,823
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,019,088
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,291,911     4,291,911
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 478,262     478,262
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,291,911      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 478,262      
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 [2]       1,612,346
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,374,664
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       31,576,176
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 32,950,840     32,950,840
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,318,432     2,318,432
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 32,950,840      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,318,432      
Operating Properties [Member] | 110 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 [2]       6,331,158
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,228,880
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,657,827
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,886,707     6,886,707
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 178,544     178,544
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,886,707      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 178,544      
Operating Properties [Member] | 140 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       1,243,100
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       6,425,239
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,243,100
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,425,239
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,668,339     7,668,339
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 196,553     196,553
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,668,339      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 196,553      
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 [2]       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     6,293,832
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 878,328     878,328
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 $ 878,328      
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 [2]       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     14,148,256
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,085,883     1,085,883
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 $ 1,085,883      
Operating Properties [Member] | 11835 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       14,121,622
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       23,025,928
Real Estate and Accumulated Depreciation, Carrying Amount of Land       14,121,622
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       23,025,928
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 37,147,550     37,147,550
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 596,879     596,879
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 37,147,550      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 596,879      
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 [2]       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     33,911,312
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 5,114,351     5,114,351
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 $ 5,114,351      
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 [3]       0
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 [2]       579,936
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,639,734
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       12,890,677
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 15,530,411     15,530,411
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 981,769     981,769
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 15,530,411      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 981,769      
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 [3]       0
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 [2]       933,187
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,293,284
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       18,169,113
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 21,462,397     21,462,397
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,390,165     1,390,165
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 21,462,397      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,390,165      
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 [2]       9,393,211
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,822,710
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,815,688
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 11,638,398     11,638,398
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,416,465     1,416,465
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 11,638,398      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,416,465      
Operating Properties [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 [2]       7,660,152
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,796,023
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,649,575
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 11,445,598     11,445,598
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 96,683     96,683
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 11,445,598      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 96,683      
Operating Properties [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]       7,479,823
Real Estate and Accumulated Depreciation, Carrying Amount of Land       4,070,629
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,468,531
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 11,539,160     11,539,160
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 137,956     137,956
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 11,539,160      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 137,956      
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
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 [2]       4,670,017
Real Estate and Accumulated Depreciation, Carrying Amount of Land       5,687,013
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       24,169,312
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 29,856,325     29,856,325
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 7,740,706     7,740,706
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 29,856,325      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 7,740,706      
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 [2]       29,159,534
Real Estate and Accumulated Depreciation, Carrying Amount of Land       9,368,557
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       27,534,777
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 36,903,334     36,903,334
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 7,874,305     7,874,305
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 36,903,334      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 7,874,305      
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 [2]       243,707
Real Estate and Accumulated Depreciation, Carrying Amount of Land       464,534
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,309,979
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,774,513     6,774,513
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 449,889     449,889
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,774,513      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 449,889      
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 [2]       506,909
Real Estate and Accumulated Depreciation, Carrying Amount of Land       954,130
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       11,092,276
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 12,046,406     12,046,406
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 728,052     728,052
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 12,046,406      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 728,052      
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 [2]       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     8,056,184
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 388,295     388,295
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 $ 388,295      
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 [2]       (819,916)
Real Estate and Accumulated Depreciation, Carrying Amount of Land       305,471
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,614,589
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,920,060     4,920,060
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 450,646     450,646
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,920,060      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 450,646      
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 [2]       511,543
Real Estate and Accumulated Depreciation, Carrying Amount of Land       401,410
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,599,442
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,000,852     4,000,852
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 372,958     372,958
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,000,852      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 372,958      
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 [2]       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     2,951,137
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 244,630     244,630
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 $ 244,630      
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 [2]       357,185
Real Estate and Accumulated Depreciation, Carrying Amount of Land       370,149
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,452,302
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,822,451     3,822,451
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 333,114     333,114
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,822,451      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 333,114      
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 [2]       257,404
Real Estate and Accumulated Depreciation, Carrying Amount of Land       444,318
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,069,293
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,513,611     4,513,611
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 356,426     356,426
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,513,611      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 356,426      
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 [2]       6,220,665
Real Estate and Accumulated Depreciation, Carrying Amount of Land       791,880
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,523,059
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,314,939     6,314,939
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,345,655     1,345,655
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,314,939      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,345,655      
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 [2]       3,216,383
Real Estate and Accumulated Depreciation, Carrying Amount of Land       526,266
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,812,320
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,338,586     3,338,586
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,102,988     1,102,988
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,338,586      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,102,988      
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 [2]       3,610,018
Real Estate and Accumulated Depreciation, Carrying Amount of Land       431,106
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,279,018
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,710,124     3,710,124
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,476,028     1,476,028
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,710,124      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,476,028      
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 [2]       3,391,467
Real Estate and Accumulated Depreciation, Carrying Amount of Land       505,700
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,993,353
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,499,053     3,499,053
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 818,988     818,988
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,499,053      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 818,988      
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 [1]       1,055,450
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 [2]       5,069,178
Real Estate and Accumulated Depreciation, Carrying Amount of Land       825,092
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,765,208
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,590,300     5,590,300
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,212,331     2,212,331
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1995      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,590,300      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,212,331      
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]       3,072,355
Real Estate and Accumulated Depreciation, Carrying Amount of Land       173,623
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,382,733
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,556,356     3,556,356
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,673,063     1,673,063
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1996      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,556,356      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,673,063      
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]       2,161,830
Real Estate and Accumulated Depreciation, Carrying Amount of Land       283,368
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,161,458
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,444,826     2,444,826
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,055,218     1,055,218
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,444,826      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,055,218      
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 [2]       1,214,707
Real Estate and Accumulated Depreciation, Carrying Amount of Land       132,655
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,225,713
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,358,368     1,358,368
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 573,704     573,704
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,358,368      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 573,704      
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 [2]       6,806,479
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,525,421
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,029,751
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,555,172     7,555,172
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,127,972     1,127,972
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,555,172      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,127,972      
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]       2,805,986
Real Estate and Accumulated Depreciation, Carrying Amount of Land       231,692
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,804,916
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,036,608     3,036,608
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,447,046     1,447,046
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,036,608      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,447,046      
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 [2]       3,166,402
Real Estate and Accumulated Depreciation, Carrying Amount of Land       320,450
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,165,241
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,485,691     3,485,691
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,766,943     1,766,943
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,485,691      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,766,943      
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 [2]       3,339,774
Real Estate and Accumulated Depreciation, Carrying Amount of Land       235,698
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,338,640
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,574,338     3,574,338
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,105,912     2,105,912
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,574,338      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,105,912      
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]       2,779,342
Real Estate and Accumulated Depreciation, Carrying Amount of Land       183,888
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,778,264
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,962,152     2,962,152
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,656,145     1,656,145
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,962,152      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,656,145      
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 [2]       (4,425,698)
Real Estate and Accumulated Depreciation, Carrying Amount of Land       9,387,605
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       26,426,285
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 35,813,890     35,813,890
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,750,647     1,750,647
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 35,813,890      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,750,647      
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 [2]       364,382
Real Estate and Accumulated Depreciation, Carrying Amount of Land       813,036
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,867,457
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,680,493     2,680,493
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 268,536     268,536
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,680,493      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 268,536      
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 [2]       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     2,526,585
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 159,476     159,476
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 $ 159,476      
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 [3]       0
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 [2]       863,453
Real Estate and Accumulated Depreciation, Carrying Amount of Land       509,351
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,412,957
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,922,308     4,922,308
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 398,539     398,539
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,922,308      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 398,539      
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 [2]       133,643
Real Estate and Accumulated Depreciation, Carrying Amount of Land       558,491
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,874,195
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,432,686     6,432,686
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 396,734     396,734
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,432,686      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 396,734      
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 [2]       379,988
Real Estate and Accumulated Depreciation, Carrying Amount of Land       426,927
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,840,501
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,267,428     4,267,428
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 378,078     378,078
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,267,428      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 378,078      
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 [2]       1,023,687
Real Estate and Accumulated Depreciation, Carrying Amount of Land       545,501
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,951,386
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,496,887     4,496,887
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 424,803     424,803
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2010      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,496,887      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 424,803      
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 [2]       3,358,808
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,340,609
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,848,527
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 12,189,136     12,189,136
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,876,354     1,876,354
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2010      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 12,189,136      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,876,354      
Operating Properties [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]       3,627,200
Real Estate and Accumulated Depreciation, Carrying Amount of Land       992,093
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,608,589
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,600,682     4,600,682
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 122,958     122,958
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,600,682      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 122,958      
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 [3]       0
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 [2]       132,607
Real Estate and Accumulated Depreciation, Carrying Amount of Land       201,469
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,764,169
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,965,638     1,965,638
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 148,538     148,538
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,965,638      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 148,538      
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
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]       3,274,945
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,135,483
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       9,602,396
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 10,737,879     10,737,879
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,102,435     3,102,435
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 10,737,879      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,102,435      
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
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 [2]       458,927
Real Estate and Accumulated Depreciation, Carrying Amount of Land       799,560
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,408,192
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,207,752     7,207,752
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,214,384     2,214,384
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,207,752      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,214,384      
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
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]       2,781,419
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,008,542
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       8,191,655
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 9,200,197     9,200,197
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,351,372     2,351,372
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,200,197      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,351,372      
Operating Properties [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 [2]       7,397,354
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,534,644
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,368,565
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,903,209     8,903,209
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 162,097     162,097
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,903,209      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 162,097      
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 [3]       0
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 [2]       145,476
Real Estate and Accumulated Depreciation, Carrying Amount of Land       80,730
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,016,132
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,096,862     1,096,862
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 91,740     91,740
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,096,862      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 91,740      
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 [3]       0
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 [2]       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     1,827,143
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 163,411     163,411
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 $ 163,411      
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 [3]       0
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 [2]       442,674
Real Estate and Accumulated Depreciation, Carrying Amount of Land       510,102
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,571,716
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,081,818     5,081,818
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 389,908     389,908
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,081,818      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 389,908      
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 [3]       0
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 [2]       553,328
Real Estate and Accumulated Depreciation, Carrying Amount of Land       218,850
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,193,229
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,412,079     2,412,079
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 188,352     188,352
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,412,079      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 188,352      
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 [3]       0
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 [2]       114,556
Real Estate and Accumulated Depreciation, Carrying Amount of Land       211,279
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,668,712
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,879,991     1,879,991
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 145,411     145,411
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,879,991      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 145,411      
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 [2]       4,859,739
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,699,632
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,556,901
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,256,533     6,256,533
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 417,555     417,555
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,256,533      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 417,555      
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 [3]       0
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 [2]       287,441
Real Estate and Accumulated Depreciation, Carrying Amount of Land       283,107
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,364,764
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,647,871     2,647,871
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 205,864     205,864
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,647,871      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 205,864      
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 [3]       0
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 [2]       143,093
Real Estate and Accumulated Depreciation, Carrying Amount of Land       367,446
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,095,545
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,462,991     2,462,991
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 184,076     184,076
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,462,991      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 184,076      
Operating Properties [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 [3]       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 [2]       5,679,691
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,405,899
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,650,985
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,056,884     7,056,884
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 329,025     329,025
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,056,884      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 329,025      
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 [3]       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 [2]       7,239,740
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,861,540
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,208,619
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 9,070,159     9,070,159
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 879,677     879,677
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,070,159      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 879,677      
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 [2]       247,397
Real Estate and Accumulated Depreciation, Carrying Amount of Land       755,121
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,403,171
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,158,292     4,158,292
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 308,320     308,320
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,158,292      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 308,320      
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 [2]       230,574
Real Estate and Accumulated Depreciation, Carrying Amount of Land       418,580
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,795,161
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,213,741     2,213,741
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 167,358     167,358
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,213,741      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 167,358      
Operating Properties [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 [2]       8,528,507
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,966,472
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       8,102,144
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 10,068,616     10,068,616
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 410,845     410,845
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 10,068,616      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 410,845      
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
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 [2]       510,089
Real Estate and Accumulated Depreciation, Carrying Amount of Land       438,853
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,540,485
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,979,338     3,979,338
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,716,546     1,716,546
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,979,338      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,716,546      
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 [2]       334,634
Real Estate and Accumulated Depreciation, Carrying Amount of Land       529,876
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,602,506
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,132,382     4,132,382
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 266,194     266,194
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,132,382      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 266,194      
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
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 [2]       288,397
Real Estate and Accumulated Depreciation, Carrying Amount of Land       363,339
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,797,583
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,160,922     3,160,922
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,278,617     1,278,617
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,160,922      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,278,617      
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
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 [2]       5,128,210
Real Estate and Accumulated Depreciation, Carrying Amount of Land       592,234
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,865,937
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,458,171     5,458,171
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,215,130     1,215,130
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,458,171      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,215,130      
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 [3]       0
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 [2]       524,936
Real Estate and Accumulated Depreciation, Carrying Amount of Land       197,226
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,459,972
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,657,198     1,657,198
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 148,054     148,054
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,657,198      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 148,054      
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
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 [2]       1,285,142
Real Estate and Accumulated Depreciation, Carrying Amount of Land       289,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,845,000
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,134,000     5,134,000
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,796,918     1,796,918
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,134,000      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,796,918      
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
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 [2]       5,162,588
Real Estate and Accumulated Depreciation, Carrying Amount of Land       503,779
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,943,212
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,446,991     5,446,991
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,242,290     1,242,290
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,446,991      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,242,290      
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
Real Estate and Accumulated Depreciation, Initial Cost of Land       298,999
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       3,423,751
Real Estate and Accumulated Depreciation, Carrying Amount of Land       496,186
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,226,564
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,722,750     3,722,750
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,102,188     1,102,188
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,722,750      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,102,188      
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 [3]       0
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 [2]       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     2,526,097
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 144,198     144,198
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 $ 144,198      
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
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 [2]       4,169,789
Real Estate and Accumulated Depreciation, Carrying Amount of Land       492,869
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,988,872
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,481,741     4,481,741
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,148,408     1,148,408
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,481,741      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,148,408      
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
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]       2,463,366
Real Estate and Accumulated Depreciation, Carrying Amount of Land       414,691
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,463,366
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,878,057     2,878,057
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 710,865     710,865
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,878,057      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 710,865      
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
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 [2]       1,334,826
Real Estate and Accumulated Depreciation, Carrying Amount of Land       306,147
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,358,482
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,664,629     4,664,629
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,321,325     1,321,325
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,664,629      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,321,325      
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 [3]       0
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 [2]       77,965
Real Estate and Accumulated Depreciation, Carrying Amount of Land       226,973
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,252,944
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,479,917     1,479,917
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 125,330     125,330
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,479,917      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 125,330      
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 [3]       0
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 [2]       101,328
Real Estate and Accumulated Depreciation, Carrying Amount of Land       244,240
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,513,950
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,758,190     1,758,190
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 212,509     212,509
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,758,190      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 212,509      
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 [3]       0
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 [2]       68,496
Real Estate and Accumulated Depreciation, Carrying Amount of Land       252,907
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,572,549
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,825,456     1,825,456
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 182,795     182,795
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,825,456      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 182,795      
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
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 [2]       3,703,478
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,520,074
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,838,410
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 12,358,484     12,358,484
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,963,534     2,963,534
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 12,358,484      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,963,534      
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
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]       2,745,460
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,173,942
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       11,613,061
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 13,787,003     13,787,003
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,762,980     2,762,980
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 13,787,003      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,762,980      
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 [2]       6,456,833
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,513,152
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,187,222
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,700,374     7,700,374
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 845,387     845,387
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,700,374      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 845,387      
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 [2]       401,019
Real Estate and Accumulated Depreciation, Carrying Amount of Land       900,953
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,724,746
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,625,699     6,625,699
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 393,315     393,315
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,625,699      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 393,315      
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 [3]       0
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 [2]       302,577
Real Estate and Accumulated Depreciation, Carrying Amount of Land       530,494
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,411,203
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,941,697     4,941,697
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 349,877     349,877
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,941,697      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 349,877      
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 [3]       0
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 [2]       1,076,398
Real Estate and Accumulated Depreciation, Carrying Amount of Land       450,422
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,381,340
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,831,762     4,831,762
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 348,376     348,376
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,831,762      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 348,376      
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
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 [2]       26,899,370
Real Estate and Accumulated Depreciation, Carrying Amount of Land       7,083,514
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       24,331,718
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 31,415,232     31,415,232
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,891,588     4,891,588
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 31,415,232      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 4,891,588      
Operating Properties [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 [2]       13,408,133
Real Estate and Accumulated Depreciation, Carrying Amount of Land       4,858,012
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       13,163,491
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 18,021,503     18,021,503
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 175,130     175,130
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 18,021,503      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 175,130      
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
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]       2,914,238
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,899,861
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       14,500,978
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 17,400,839     17,400,839
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,963,281     2,963,281
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 17,400,839      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,963,281      
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
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 [2]       1,583,440
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,374,012
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,953,443
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 9,327,455     9,327,455
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,694,472     1,694,472
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,327,455      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,694,472      
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
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 [2]       2,077,957
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,290,002
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       17,375,097
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 19,665,099     19,665,099
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 5,655,134     5,655,134
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 19,665,099      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 5,655,134      
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
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 [2]       1,366,797
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,775,021
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,731,537
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 10,506,558     10,506,558
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,582,582     2,582,582
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 10,506,558      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,582,582      
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
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 [2]       691,043
Real Estate and Accumulated Depreciation, Carrying Amount of Land       638,477
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,949,833
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,588,310     4,588,310
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,117,598     1,117,598
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,588,310      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,117,598      
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
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 [2]       1,229,017
Real Estate and Accumulated Depreciation, Carrying Amount of Land       504,341
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,107,344
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,611,685     4,611,685
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,594,524     1,594,524
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,611,685      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,594,524      
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 [2]       9,341,500
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,120,319
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       8,969,529
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 11,089,848     11,089,848
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 823,048     823,048
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 11,089,848      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 823,048      
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 [2]       (5,157,005)
Real Estate and Accumulated Depreciation, Carrying Amount of Land       10,580,565
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       31,154,156
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 41,734,721     41,734,721
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,992,227     1,992,227
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 41,734,721      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,992,227      
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 [2]       189,936
Real Estate and Accumulated Depreciation, Carrying Amount of Land       842,043
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,174,023
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,016,066     2,016,066
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 88,861     88,861
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,016,066      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 88,861      
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 [2]       121,166
Real Estate and Accumulated Depreciation, Carrying Amount of Land       875,172
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,192,218
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,067,390     3,067,390
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 138,233     138,233
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,067,390      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 138,233      
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
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 [2]       185,677
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,339,627
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,948,964
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,288,591     5,288,591
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 291,168     291,168
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,288,591      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 291,168      
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 [2]       47,808
Real Estate and Accumulated Depreciation, Carrying Amount of Land       866,378
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,160,424
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,026,802     3,026,802
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 147,854     147,854
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,026,802      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 147,854      
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 [2]       47,379
Real Estate and Accumulated Depreciation, Carrying Amount of Land       945,251
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,057,560
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,002,811     3,002,811
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 136,677     136,677
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,002,811      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 136,677      
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 [2]       651,604
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,246,618
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,495,996
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,742,614     8,742,614
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 540,291     540,291
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,742,614      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 540,291      
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 [2]       1,208,798
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,488,746
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,281,238
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 11,769,984     11,769,984
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 768,853     768,853
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 11,769,984      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 768,853      
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 [2]       112,794
Real Estate and Accumulated Depreciation, Carrying Amount of Land       590,922
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,487,316
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,078,238     4,078,238
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 255,854     255,854
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,078,238      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 255,854      
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 [3]       0
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 [2]       1,017,065
Real Estate and Accumulated Depreciation, Carrying Amount of Land       808,159
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,730,024
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,538,183     7,538,183
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 586,156     586,156
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,538,183      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 586,156      
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 [3]       0
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 [2]       1,389,657
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,612,924
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       11,161,337
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 12,774,261     12,774,261
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,143,207     1,143,207
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 12,774,261      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,143,207      
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 [2]       442,015
Real Estate and Accumulated Depreciation, Carrying Amount of Land       716,860
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,404,228
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,121,088     8,121,088
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 656,764     656,764
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,121,088      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 656,764      
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 [2]       (5,176,905)
Real Estate and Accumulated Depreciation, Carrying Amount of Land       9,656,579
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       32,236,261
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 41,892,840     41,892,840
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,079,669     2,079,669
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 41,892,840      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,079,669      
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 [2]       6,843,514
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,187,900
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       13,811,566
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 14,999,466     14,999,466
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,523,628     2,523,628
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1980      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 14,999,466      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,523,628      
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 [2]       12,333,739
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,132,519
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       12,311,331
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 13,443,850     13,443,850
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,888,805     4,888,805
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 13,443,850      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 4,888,805      
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 [2]       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     17,655,118
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 6,642,496     6,642,496
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 $ 6,642,496      
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      
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]       3,059,700
Real Estate and Accumulated Depreciation, Carrying Amount of Land       574,152
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,995,128
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,569,280     3,569,280
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,636,559     1,636,559
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,569,280      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,636,559      
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 [2]       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     31,725,684
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 11,446,832     11,446,832
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 $ 11,446,832      
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]       2,665,152
Real Estate and Accumulated Depreciation, Carrying Amount of Land       592,886
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,581,846
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,174,732     3,174,732
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,328,497     1,328,497
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,174,732      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,328,497      
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 [2]       4,985,162
Real Estate and Accumulated Depreciation, Carrying Amount of Land       978,402
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,026,760
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,005,162     6,005,162
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,504,856     1,504,856
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,005,162      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,504,856      
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 [2]       2,652,052
Real Estate and Accumulated Depreciation, Carrying Amount of Land       649,792
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,609,470
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,259,262     3,259,262
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,031,061     1,031,061
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,259,262      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,031,061      
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 [2]       3,187,801
Real Estate and Accumulated Depreciation, Carrying Amount of Land       867,815
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,084,356
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,952,171     3,952,171
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,338,373     1,338,373
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,952,171      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,338,373      
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 [2]       3,516,054
Real Estate and Accumulated Depreciation, Carrying Amount of Land       774,096
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,421,398
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,195,494     4,195,494
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,676,885     1,676,885
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,195,494      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,676,885      
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]       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     3,667,748
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,184,789     1,184,789
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 $ 1,184,789      
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]       2,235,108
Real Estate and Accumulated Depreciation, Carrying Amount of Land       611,436
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,225,628
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,837,064     2,837,064
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 938,955     938,955
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1995      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,837,064      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 938,955      
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 [2]       7,367,311
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,210,137
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,085,811
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,295,948     8,295,948
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,918,094     2,918,094
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1996      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,295,948      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,918,094      
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 [2]       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     5,453,521
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,124,950     2,124,950
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 $ 2,124,950      
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]       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     4,034,911
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,352,895     1,352,895
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 $ 1,352,895      
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 [2]       822,286
Real Estate and Accumulated Depreciation, Carrying Amount of Land       236,432
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,678,538
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,914,970     2,914,970
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,229,096     1,229,096
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,914,970      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,229,096      
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 [2]       420,954
Real Estate and Accumulated Depreciation, Carrying Amount of Land       217,809
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,180,368
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,398,177     2,398,177
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,086,908     1,086,908
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,398,177      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,086,908      
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 [2]       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     2,233,447
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,010,560     1,010,560
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 $ 1,010,560      
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]       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     8,357,260
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,114,770     4,114,770
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 $ 4,114,770      
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 [2]       4,293,459
Real Estate and Accumulated Depreciation, Carrying Amount of Land       705,317
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       9,030,946
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 9,736,263     9,736,263
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,118,174     4,118,174
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,736,263      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 4,118,174      
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 [2]       8,145,922
Real Estate and Accumulated Depreciation, Carrying Amount of Land       952,911
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       14,868,752
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 15,821,663     15,821,663
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 7,525,591     7,525,591
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1971      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 15,821,663      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 7,525,591      
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 [2]       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     14,892,468
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 7,102,027     7,102,027
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 $ 7,102,027      
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 [2]       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     6,094,220
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 470,057     470,057
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 $ 470,057      
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 [2]       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     5,968,755
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 376,118     376,118
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 $ 376,118      
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
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 [2]       100,699
Real Estate and Accumulated Depreciation, Carrying Amount of Land       977,542
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,508,166
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,485,708     4,485,708
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 896,629     896,629
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,485,708      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 896,629      
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
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 [2]       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     12,494,698
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,436,228     2,436,228
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 $ 2,436,228      
Operating Properties [Member] | 1701 South 16th Street [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
Real Estate and Accumulated Depreciation, Initial Cost of Land       4,063,262
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       18,719,368
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       14,007
Real Estate and Accumulated Depreciation, Carrying Amount of Land       4,063,262
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       18,733,375
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 22,796,637     22,796,637
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 175,899     175,899
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 22,796,637      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 175,899      
Operating Properties [Member] | 1842 South 16th Street [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
Real Estate and Accumulated Depreciation, Initial Cost of Land       2,226,284
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       11,976,185
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       1
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,226,284
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       11,976,185
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 14,202,469     14,202,469
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 121,220     121,220
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 14,202,469      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 121,220      
Operating Properties [Member] | 1902 South 16th Street [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
Real Estate and Accumulated Depreciation, Initial Cost of Land       2,369,095
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       14,119,020
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       0
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,369,095
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       14,119,020
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 16,488,115     16,488,115
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 153,661     153,661
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 16,488,115      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 153,661      
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 [2]       1,217,751
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,612,787
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       19,283,303
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 20,896,090     20,896,090
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,576,732     1,576,732
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 20,896,090      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,576,732      
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 [2]       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     6,403,898
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,002,593     2,002,593
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 $ 2,002,593      
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 [2]       45,852,967
Real Estate and Accumulated Depreciation, Carrying Amount of Land       11,254,716
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       45,847,801
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 57,102,517     57,102,517
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 11,516,501     11,516,501
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 57,102,517      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 11,516,501      
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 [1]       1,308,636
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 [2]       33,693,805
Real Estate and Accumulated Depreciation, Carrying Amount of Land       11,353,373
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       28,739,247
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 40,092,620     40,092,620
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,225,699     4,225,699
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 40,092,620      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 4,225,699      
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 [2]       560,063
Real Estate and Accumulated Depreciation, Carrying Amount of Land       445,493
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,720,679
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 11,166,172     11,166,172
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 817,306     817,306
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 11,166,172      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 817,306      
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]       2,473,288
Real Estate and Accumulated Depreciation, Carrying Amount of Land       5,603,460
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       21,281,275
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 26,884,735     26,884,735
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,285,891     3,285,891
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 26,884,735      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,285,891      
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 [2]       8,440,217
Real Estate and Accumulated Depreciation, Carrying Amount of Land       406,421
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       12,033,796
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 12,440,217     12,440,217
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,233,709     4,233,709
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1982      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 12,440,217      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 4,233,709      
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 [2]       1,497,873
Real Estate and Accumulated Depreciation, Carrying Amount of Land       419,460
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,290,443
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,709,903     5,709,903
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,430,271     2,430,271
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1982      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,709,903      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,430,271      
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 [2]       441,766
Real Estate and Accumulated Depreciation, Carrying Amount of Land       832,244
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,774,438
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,606,682     2,606,682
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 991,773     991,773
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2003      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,606,682      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation 991,773      
Operating Properties [Member] | 10 Valley Stream Parkway [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       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]       2,713,241
Real Estate and Accumulated Depreciation, Carrying Amount of Land       509,899
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,712,417
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 3,222,316     3,222,316
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,928,155     1,928,155
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1984      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,222,316      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,928,155      
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 [2]       5,938,247
Real Estate and Accumulated Depreciation, Carrying Amount of Land       724,846
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,937,459
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,662,305     6,662,305
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,867,193     3,867,193
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,662,305      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,867,193      
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 [2]       7,509,345
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,977,935
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,852,035
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,829,970     8,829,970
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,650,379     3,650,379
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,829,970      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,650,379      
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 [2]       16,464,560
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,676,470
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       16,224,904
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 17,901,374     17,901,374
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 8,391,087     8,391,087
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 17,901,374      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 8,391,087      
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]       1,933,302
Real Estate and Accumulated Depreciation, Carrying Amount of Land       708,331
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,721,268
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,429,599     2,429,599
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,465,358     1,465,358
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,429,599      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,465,358      
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 [2]       14,958,472
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,837,878
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       14,957,644
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 16,795,522     16,795,522
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 13,914,941     13,914,941
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1986      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 16,795,522      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 13,914,941      
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 [2]       1,299,026
Real Estate and Accumulated Depreciation, Carrying Amount of Land       128,767
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,300,948
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,429,715     1,429,715
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,027,154     1,027,154
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1982      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,429,715      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,027,154      
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 [2]       5,887,728
Real Estate and Accumulated Depreciation, Carrying Amount of Land       643,892
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,908,118
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,552,010     6,552,010
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,948,650     3,948,650
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,552,010      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,948,650      
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]       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     3,265,229
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,087,960     2,087,960
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 $ 2,087,960      
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 [2]       (1,229,407)
Real Estate and Accumulated Depreciation, Carrying Amount of Land       397,293
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,743,557
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,140,850     3,140,850
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,929,736     1,929,736
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1980      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,140,850      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,929,736      
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 [2]       12,244,703
Real Estate and Accumulated Depreciation, Carrying Amount of Land       5,405,042
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       12,244,702
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 17,649,744     17,649,744
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,922,198     3,922,198
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2003      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 17,649,744      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,922,198      
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 [2]       6,326,058
Real Estate and Accumulated Depreciation, Carrying Amount of Land       466,413
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,325,184
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,791,597     6,791,597
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,609,500     3,609,500
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1987      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,791,597      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,609,500      
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 [2]       698,060
Real Estate and Accumulated Depreciation, Carrying Amount of Land       812,745
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,120,301
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,933,046     3,933,046
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,560,393     2,560,393
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,933,046      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,560,393      
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 [2]       5,097,623
Real Estate and Accumulated Depreciation, Carrying Amount of Land       505,458
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,096,776
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,602,234     5,602,234
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,762,693     3,762,693
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1983      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,602,234      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,762,693      
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]       2,462,600
Real Estate and Accumulated Depreciation, Carrying Amount of Land       449,447
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,461,928
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,911,375     2,911,375
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,965,745     1,965,745
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1977      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,911,375      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,965,745      
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]       2,293,109
Real Estate and Accumulated Depreciation, Carrying Amount of Land       531,534
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,292,304
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,823,838     2,823,838
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,645,958     1,645,958
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1984      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,823,838      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,645,958      
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 [2]       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     5,956,711
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,151,209     2,151,209
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 $ 2,151,209      
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 [2]       578,846
Real Estate and Accumulated Depreciation, Carrying Amount of Land       128,783
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       578,189
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 706,972     706,972
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 431,050     431,050
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1975      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 706,972      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 431,050      
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 [2]       1,674,659
Real Estate and Accumulated Depreciation, Carrying Amount of Land       374,497
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,668,788
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,043,285     2,043,285
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 974,979     974,979
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,043,285      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 974,979      
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 [2]       6,310,460
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,402,795
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,844,877
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,247,672     7,247,672
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,158,514     3,158,514
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,247,672      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,158,514      
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]       2,710,506
Real Estate and Accumulated Depreciation, Carrying Amount of Land       397,948
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,709,689
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,107,637     3,107,637
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,087,871     2,087,871
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1984      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,107,637      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,087,871      
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 [2]       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     4,232,373
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,519,003     2,519,003
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 $ 2,519,003      
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]       1,331,417
Real Estate and Accumulated Depreciation, Carrying Amount of Land       4,241,166
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       19,068,477
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 23,309,643     23,309,643
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 6,715,218     6,715,218
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 23,309,643      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 6,715,218      
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]       3,338,034
Real Estate and Accumulated Depreciation, Carrying Amount of Land       325,775
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,335,177
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,660,952     3,660,952
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,728,072     1,728,072
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1987      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,660,952      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,728,072      
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 [2]       8,894,039
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,055,243
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       8,893,214
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 9,948,457     9,948,457
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 5,107,113     5,107,113
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,948,457      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 5,107,113      
Operating Properties [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 [2]       45,847,471
Real Estate and Accumulated Depreciation, Carrying Amount of Land       9,953,208
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       39,741,764
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 49,694,972     49,694,972
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,440,221     1,440,221
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 49,694,972      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,440,221      
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 [2]       1,708,623
Real Estate and Accumulated Depreciation, Carrying Amount of Land       321,473
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,578,264
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,899,737     1,899,737
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 777,850     777,850
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,899,737      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 777,850      
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 [2]       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     19,703,042
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 7,853,956     7,853,956
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 $ 7,853,956      
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 [2]       4,810,941
Real Estate and Accumulated Depreciation, Carrying Amount of Land       795,831
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,810,253
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,606,084     5,606,084
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,261,529     3,261,529
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1974      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,606,084      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,261,529      
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 [2]       2,433,278
Real Estate and Accumulated Depreciation, Carrying Amount of Land       684,200
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       8,614,939
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 9,299,139     9,299,139
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,892,306     3,892,306
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1983      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,299,139      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,892,306      
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 [2]       14,095,935
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,337,076
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       13,608,435
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 14,945,511     14,945,511
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 7,142,147     7,142,147
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 14,945,511      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 7,142,147      
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]       3,097,099
Real Estate and Accumulated Depreciation, Carrying Amount of Land       323,792
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,097,278
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,421,070     3,421,070
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,715,770     1,715,770
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1987      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,421,070      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,715,770      
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 [2]       3,162,401
Real Estate and Accumulated Depreciation, Carrying Amount of Land       762,370
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 $ 3,634,765     3,634,765
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,822,114     1,822,114
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,634,765      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,822,114      
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 [2]       1,653,624
Real Estate and Accumulated Depreciation, Carrying Amount of Land       332,216
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,652,800
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,985,016     1,985,016
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,239,476     1,239,476
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1984      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,985,016      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,239,476      
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 [2]       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     1,283,537
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 767,105     767,105
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 $ 767,105      
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 [2]       4,674,159
Real Estate and Accumulated Depreciation, Carrying Amount of Land       215,818
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,673,346
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,889,164     4,889,164
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,362,628     3,362,628
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1983      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,889,164      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,362,628      
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 [2]       5,598,450
Real Estate and Accumulated Depreciation, Carrying Amount of Land       884,974
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       14,863,900
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 15,748,874     15,748,874
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 9,641,208     9,641,208
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 15,748,874      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 9,641,208      
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 [2]       9,359,782
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,798,565
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       8,574,967
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 11,373,532     11,373,532
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,318,193     4,318,193
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 11,373,532      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 4,318,193      
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 [2]       7,371,688
Real Estate and Accumulated Depreciation, Carrying Amount of Land       382,361
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,370,871
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,753,232     7,753,232
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 5,680,759     5,680,759
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1983      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,753,232      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 5,680,759      
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 [2]       7,669,918
Real Estate and Accumulated Depreciation, Carrying Amount of Land       177,317
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,669,036
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,846,353     7,846,353
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,710,578     3,710,578
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,846,353      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,710,578      
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 [2]       9,090,281
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,785,823
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       8,318,208
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 11,104,031     11,104,031
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,266,657     4,266,657
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 11,104,031      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 4,266,657      
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 [2]       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     761,446
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 530,257     530,257
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 $ 530,257      
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 [2]       5,878,044
Real Estate and Accumulated Depreciation, Carrying Amount of Land       888,359
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,877,349
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,765,708     6,765,708
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,180,373     4,180,373
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1978      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,765,708      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 4,180,373      
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 [3]       0
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 [2]       437,586
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,232,219
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       18,334,912
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 19,567,131     19,567,131
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,266,254     1,266,254
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 19,567,131      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,266,254      
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]       2,856,020
Real Estate and Accumulated Depreciation, Carrying Amount of Land       506,318
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,906,876
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,413,194     3,413,194
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 815,741     815,741
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,413,194      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 815,741      
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]       2,341,147
Real Estate and Accumulated Depreciation, Carrying Amount of Land       430,909
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,329,969
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,760,878     2,760,878
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 692,328     692,328
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2003      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,760,878      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 692,328      
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 [2]       548,801
Real Estate and Accumulated Depreciation, Carrying Amount of Land       600,666
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,732,931
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,333,597     5,333,597
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 562,055     562,055
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,333,597      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 562,055      
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 [2]       554,330
Real Estate and Accumulated Depreciation, Carrying Amount of Land       660,420
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,339,457
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,999,877     5,999,877
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 573,447     573,447
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,999,877      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 573,447      
Operating Properties [Member] | 11150 NW 122nd 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
Real Estate and Accumulated Depreciation, Initial Cost of Land       6,627,899
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       12,312,993
Real Estate and Accumulated Depreciation, Carrying Amount of Land       6,627,899
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       12,312,993
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 18,940,892     18,940,892
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 23,539     23,539
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 18,940,892      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 23,539      
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 [3]       0
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 [2]       1,058,964
Real Estate and Accumulated Depreciation, Carrying Amount of Land       5,558,619
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       18,737,201
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 24,295,820     24,295,820
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,568,252     1,568,252
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 24,295,820      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,568,252      
Operating Properties [Member] | 11450 NW 122nd 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 [3]       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 [2]       11,424,123
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,919,238
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       9,128,178
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 13,047,416     13,047,416
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 165,377     165,377
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 13,047,416      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 165,377      
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 [2]       8,784,706
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,177,953
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       12,730,047
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 14,908,000     14,908,000
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,418,348     4,418,348
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1986      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 14,908,000      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 4,418,348      
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 [2]       2,172,758
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,273,731
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,331,363
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,605,094     6,605,094
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 621,422     621,422
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,605,094      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 621,422      
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 [2]       1,465,285
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,236,687
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,227,483
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,464,170     5,464,170
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 525,972     525,972
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,464,170      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 525,972      
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 [2]       4,589,711
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,862,683
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       18,947,692
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 22,810,375     22,810,375
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,412,246     1,412,246
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 22,810,375      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,412,246      
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 [2]       17,244,782
Real Estate and Accumulated Depreciation, Carrying Amount of Land       6,265,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       17,184,189
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 23,449,189     23,449,189
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,082,595     3,082,595
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 23,449,189      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,082,595      
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 [2]       18,964,847
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,980,689
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       18,944,669
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 21,925,358     21,925,358
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 7,494,426     7,494,426
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 21,925,358      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 7,494,426      
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]       2,559,388
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,022,153
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       13,905,269
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 15,927,422     15,927,422
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 6,122,348     6,122,348
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 15,927,422      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 6,122,348      
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]       3,368,718
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,022,152
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       14,725,861
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 16,748,013     16,748,013
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 6,870,656     6,870,656
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 16,748,013      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 6,870,656      
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 [3]       0
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 [2]       561,745
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,097,170
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,277,146
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 12,374,316     12,374,316
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 900,093     900,093
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 12,374,316      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 900,093      
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 [3]       0
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 [2]       599,026
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,263,153
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,860,785
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 13,123,938     13,123,938
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 863,362     863,362
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 13,123,938      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 863,362      
Operating Properties [Member] | 22750 Cactus Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Moreno Valley, CA      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       9,404,283
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       24,380,934
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       1,851,865
Real Estate and Accumulated Depreciation, Carrying Amount of Land       9,408,276
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       26,228,806
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 35,637,082     35,637,082
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,145,548     1,145,548
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 35,637,082      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,145,548      
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 [1]       2,448,428
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 [2]       1,029,987
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,071,600
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,427,794
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,499,394     6,499,394
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,121,720     1,121,720
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2010      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,499,394      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,121,720      
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 [3]       0
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 [2]       330,260
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,449,450
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,754,834
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,204,284     6,204,284
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,135,785     1,135,785
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,204,284      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,135,785      
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 [3]       0
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 [2]       748,771
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,031,685
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,403,683
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,435,368     7,435,368
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,349,024     1,349,024
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,435,368      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,349,024      
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 [3]       0
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 [2]       208,184
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,301,211
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,521,088
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,822,299     6,822,299
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,261,597     1,261,597
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,822,299      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,261,597      
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 [2]       972,543
Real Estate and Accumulated Depreciation, Carrying Amount of Land       566,650
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,071,880
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,638,530     7,638,530
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 559,650     559,650
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,638,530      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 559,650      
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 [2]       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     3,169,803
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 214,673     214,673
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 $ 214,673      
Operating Properties [Member] | 10020 South Reinhart Drive [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       1,516,764
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       7,938,332
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,516,764
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,938,332
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 9,455,096     9,455,096
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 17,072     17,072
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,455,096      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 17,072      
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 [3]       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]       1,972,730
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,011,030
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,037,279
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 12,048,309     12,048,309
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,981,242     2,981,242
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 12,048,309      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,981,242      
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]       2,081,514
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,809,927
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       9,339,152
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 11,149,079     11,149,079
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,793,143     2,793,143
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 11,149,079      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,793,143      
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 [2]       423,090
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,686,533
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,548,862
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 13,235,395     13,235,395
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 796,449     796,449
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 13,235,395      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 796,449      
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]       2,826,589
Real Estate and Accumulated Depreciation, Carrying Amount of Land       435,400
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,807,095
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,242,495     3,242,495
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 595,975     595,975
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,242,495      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 595,975      
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 [2]       1,371,463
Real Estate and Accumulated Depreciation, Carrying Amount of Land       680,312
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,492,217
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,172,529     4,172,529
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,277,241     1,277,241
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2003      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,172,529      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,277,241      
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 [2]       697,018
Real Estate and Accumulated Depreciation, Carrying Amount of Land       522,991
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,259,767
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,782,758     3,782,758
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,498,163     1,498,163
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,782,758      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,498,163      
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       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       2,515,652
Real Estate and Accumulated Depreciation, Carrying Amount of Land       685,383
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,494,874
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,180,257     3,180,257
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 835,590     835,590
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,180,257      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 835,590      
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 [2]       1,443,203
Real Estate and Accumulated Depreciation, Carrying Amount of Land       878,320
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,002,036
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,880,356     4,880,356
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,246,297     1,246,297
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2003      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,880,356      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,246,297      
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 [2]       966,144
Real Estate and Accumulated Depreciation, Carrying Amount of Land       518,043
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,528,082
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,046,125     4,046,125
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,641,797     1,641,797
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1962      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,046,125      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,641,797      
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 [2]       1,522,627
Real Estate and Accumulated Depreciation, Carrying Amount of Land       538,512
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,699,417
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,237,929     5,237,929
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,094,870     2,094,870
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,237,929      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,094,870      
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 [3]       0
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 [2]       992,966
Real Estate and Accumulated Depreciation, Carrying Amount of Land       913,201
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,811,576
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,724,777     8,724,777
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 588,768     588,768
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,724,777      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 588,768      
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 [2]       7,315,061
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,283,713
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,315,061
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,598,774     8,598,774
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,716,515     2,716,515
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,598,774      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,716,515      
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       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]       2,856,683
Real Estate and Accumulated Depreciation, Carrying Amount of Land       825,673
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,498,306
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,323,979     3,323,979
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 765,398     765,398
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,323,979      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 765,398      
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       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]       2,671,463
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,271,785
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,157,851
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 12,429,636     12,429,636
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,185,561     3,185,561
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 12,429,636      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,185,561      
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       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 [2]       3,218,244
Real Estate and Accumulated Depreciation, Carrying Amount of Land       642,427
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,961,781
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,604,208     3,604,208
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,182,199     1,182,199
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,604,208      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,182,199      
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       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 [2]       4,443,586
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,244,667
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,679,052
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,923,719     8,923,719
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 539,257     539,257
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,923,719      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 539,257      
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       535,964
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       3,830,045
Real Estate and Accumulated Depreciation, Carrying Amount of Land       704,800
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,661,209
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,366,009     4,366,009
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,304,742     1,304,742
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,366,009      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,304,742      
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       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 [2]       738,697
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,435,301
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,913,339
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,348,640     8,348,640
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,847,017     1,847,017
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,348,640      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,847,017      
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       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 [2]       5,673,010
Real Estate and Accumulated Depreciation, Carrying Amount of Land       925,671
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,651,040
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,576,711     6,576,711
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,030,995     2,030,995
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,576,711      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,030,995      
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       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 [2]       342,626
Real Estate and Accumulated Depreciation, Carrying Amount of Land       872,550
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,868,669
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,741,219     3,741,219
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 210,997     210,997
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,741,219      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 210,997      
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       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 [2]       3,792,659
Real Estate and Accumulated Depreciation, Carrying Amount of Land       830,953
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,865,407
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,696,360     4,696,360
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,131,855     1,131,855
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,696,360      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,131,855      
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       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 [2]       557,740
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,457,286
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,319,159
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,776,445     8,776,445
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,760,890     1,760,890
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,776,445      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,760,890      
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       1,431,489
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 [2]       774,940
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,445,807
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       8,763,161
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 10,208,968     10,208,968
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,132,308     2,132,308
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 10,208,968      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,132,308      
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       1,553,537
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 [2]       442,791
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,570,863
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,127,708
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,698,571     7,698,571
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,462,499     1,462,499
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,698,571      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,462,499      
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       1,931,697
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]       2,056,346
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,932,004
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       8,444,242
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 10,376,246     10,376,246
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,444,586     3,444,586
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 10,376,246      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,444,586      
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       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]       2,818,589
Real Estate and Accumulated Depreciation, Carrying Amount of Land       373,500
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,778,081
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,151,581     3,151,581
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 593,811     593,811
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2010      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,151,581      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 593,811      
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       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]       2,909,996
Real Estate and Accumulated Depreciation, Carrying Amount of Land       464,800
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,889,185
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,353,985     3,353,985
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 596,409     596,409
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,353,985      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 596,409      
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       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]       2,771,357
Real Estate and Accumulated Depreciation, Carrying Amount of Land       587,319
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,758,869
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,346,188     3,346,188
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,325,625     1,325,625
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,346,188      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,325,625      
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       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 [2]       157,434
Real Estate and Accumulated Depreciation, Carrying Amount of Land       252,850
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,455,357
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,708,207     1,708,207
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 624,691     624,691
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,708,207      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 624,691      
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       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 [2]       368,173
Real Estate and Accumulated Depreciation, Carrying Amount of Land       405,362
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,514,719
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,920,081     1,920,081
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 659,038     659,038
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,920,081      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 659,038      
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       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 [2]       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     4,923,393
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,181,997     1,181,997
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 $ 1,181,997      
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 [2]       14,598,919
Real Estate and Accumulated Depreciation, Carrying Amount of Land       347,892
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       14,818,307
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 15,166,199     15,166,199
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,660,239     3,660,239
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 15,166,199      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,660,239      
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 [2]       14,015,611
Real Estate and Accumulated Depreciation, Carrying Amount of Land       569,349
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       14,013,793
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 14,583,142     14,583,142
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,346,628     1,346,628
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 14,583,142      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,346,628      
Operating Properties [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 [2]       22,517,921
Real Estate and Accumulated Depreciation, Carrying Amount of Land       449,013
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       22,312,813
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 22,761,826     22,761,826
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 660,907     660,907
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 22,761,826      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 660,907      
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 [2]       23,121,914
Real Estate and Accumulated Depreciation, Carrying Amount of Land       417,823
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       22,918,817
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 23,336,640     23,336,640
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,843,788     3,843,788
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2008      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 23,336,640      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,843,788      
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       1,255,507
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       10,095,284
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,142,358
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,208,433
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 11,350,791     11,350,791
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 53,311     53,311
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 11,350,791      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 53,311      
Operating Properties [Member] | 4020 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 [2]       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     7,149,753
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 632,559     632,559
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 $ 632,559      
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 [2]       7,153,008
Real Estate and Accumulated Depreciation, Carrying Amount of Land       616,670
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,582,639
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,199,309     7,199,309
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 781,536     781,536
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,199,309      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 781,536      
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 [2]       34,847,713
Real Estate and Accumulated Depreciation, Carrying Amount of Land       413,030
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       34,837,356
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 35,250,386     35,250,386
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 5,702,066     5,702,066
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2008      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 35,250,386      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 5,702,066      
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 [2]       7,672,123
Real Estate and Accumulated Depreciation, Carrying Amount of Land       613,248
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       8,383,764
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,997,012     8,997,012
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,603,181     2,603,181
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2003      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,997,012      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,603,181      
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 [2]       5,534,823
Real Estate and Accumulated Depreciation, Carrying Amount of Land       366,982
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,059,733
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,426,715     6,426,715
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,302,303     1,302,303
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,426,715      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,302,303      
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 [2]       75,115,021
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,897,303
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       74,983,059
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 76,880,362     76,880,362
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 6,019,701     6,019,701
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 76,880,362      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 6,019,701      
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 [1]       41,599,979
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 [2]       45,346,171
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       46,080,446
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 46,080,446     46,080,446
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,419,961     2,419,961
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 46,080,446      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,419,961      
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 [2]       3,444,481
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,519,510
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,243,041
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 9,762,551     9,762,551
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 951,813     951,813
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,762,551      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 951,813      
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 [2]       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     7,190,918
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,774,118     1,774,118
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 $ 1,774,118      
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 [2]       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     20,723,646
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,965,448     3,965,448
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 $ 3,965,448      
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
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 [2]       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     12,339,326
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,385,757     2,385,757
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 $ 2,385,757      
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
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 [2]       1,602,958
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,895,539
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       18,327,241
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 22,222,780     22,222,780
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,940,890     4,940,890
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 22,222,780      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 4,940,890      
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
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 [2]       841,102
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,646,318
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,538,541
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 13,184,859     13,184,859
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,572,185     2,572,185
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 13,184,859      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,572,185      
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 [2]       3,725,648
Real Estate and Accumulated Depreciation, Carrying Amount of Land       4,765,172
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       14,278,523
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 19,043,695     19,043,695
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,717,243     2,717,243
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 19,043,695      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,717,243      
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
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 [2]       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     5,883,549
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,165,695     1,165,695
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 $ 1,165,695      
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
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 [2]       (413,426)
Real Estate and Accumulated Depreciation, Carrying Amount of Land       7,318,457
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       24,135,975
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 31,454,432     31,454,432
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 5,237,323     5,237,323
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 31,454,432      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 5,237,323      
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]       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     6,031,253
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,406,218     1,406,218
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 $ 1,406,218      
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 [2]       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     14,638,565
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,761,963     2,761,963
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 $ 2,761,963      
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 [2]       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     16,870,843
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,491,474     2,491,474
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 $ 2,491,474      
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 [2]       6,213,419
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,761,587
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       14,544,539
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 18,306,126     18,306,126
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,376,591     2,376,591
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 18,306,126      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,376,591      
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 [2]       12,185,794
Real Estate and Accumulated Depreciation, Carrying Amount of Land       5,636,070
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       26,654,856
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 32,290,926     32,290,926
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,513,535     1,513,535
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 32,290,926      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,513,535      
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 [2]       1,437,937
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,225,839
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,497,172
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,723,011     5,723,011
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 765,726     765,726
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,723,011      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 765,726      
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 [2]       15,263,279
Real Estate and Accumulated Depreciation, Carrying Amount of Land       11,318,033
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       15,168,184
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 26,486,217     26,486,217
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,379,031     1,379,031
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 26,486,217      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,379,031      
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 [2]       262,438
Real Estate and Accumulated Depreciation, Carrying Amount of Land       706,660
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,156,769
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,863,429     6,863,429
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 460,973     460,973
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,863,429      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 460,973      
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 [3]       0
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 [2]       483,119
Real Estate and Accumulated Depreciation, Carrying Amount of Land       555,168
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,884,908
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,440,076     7,440,076
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 558,551     558,551
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,440,076      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 558,551      
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 [3]       0
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 [2]       259,234
Real Estate and Accumulated Depreciation, Carrying Amount of Land       551,706
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,056,674
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,608,380     6,608,380
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 466,496     466,496
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,608,380      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 466,496      
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 [2]       1,969,523
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,047,996
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       11,188,270
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 12,236,266     12,236,266
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 788,053     788,053
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 12,236,266      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 788,053      
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 [2]       482,797
Real Estate and Accumulated Depreciation, Carrying Amount of Land       877,564
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,943,482
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,821,046     8,821,046
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 606,978     606,978
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,821,046      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 606,978      
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 [2]       288,436
Real Estate and Accumulated Depreciation, Carrying Amount of Land       580,456
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,969,719
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,550,175     6,550,175
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 468,457     468,457
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,550,175      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 468,457      
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 [2]       351,565
Real Estate and Accumulated Depreciation, Carrying Amount of Land       723,534
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,356,488
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,080,022     7,080,022
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 521,078     521,078
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,080,022      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 521,078      
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 [2]       337,903
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,689,726
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       8,275,048
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 9,964,774     9,964,774
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,661,095     3,661,095
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1994      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,964,774      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,661,095      
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 [2]       1,096,872
Real Estate and Accumulated Depreciation, Carrying Amount of Land       198,205
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,890,293
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,088,498     3,088,498
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,271,956     1,271,956
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1978      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,088,498      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,271,956      
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 [2]       695,245
Real Estate and Accumulated Depreciation, Carrying Amount of Land       384,235
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,136,714
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,520,949     4,520,949
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,801,271     1,801,271
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,520,949      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,801,271      
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 [2]       685,534
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,616,360
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,172,995
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,789,355     6,789,355
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 439,194     439,194
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,789,355      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 439,194      
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 [3]       0
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 [2]       535,693
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,327,017
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,063,097
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,390,114     6,390,114
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 436,332     436,332
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,390,114      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 436,332      
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 [2]       1,339,780
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,157,049
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,960,736
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,117,785     7,117,785
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,562,539     2,562,539
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1986      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,117,785      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,562,539      
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 [2]       456,063
Real Estate and Accumulated Depreciation, Carrying Amount of Land       392,138
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,021,851
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,413,989     2,413,989
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 986,732     986,732
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,413,989      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 986,732      
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 [2]       672,190
Real Estate and Accumulated Depreciation, Carrying Amount of Land       972,232
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,564,275
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,536,507     5,536,507
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,066,582     2,066,582
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1957      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,536,507      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,066,582      
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 [2]       368,976
Real Estate and Accumulated Depreciation, Carrying Amount of Land       203,247
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,180,070
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,383,317     1,383,317
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 508,390     508,390
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,383,317      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 508,390      
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 [2]       203,999
Real Estate and Accumulated Depreciation, Carrying Amount of Land       203,247
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,015,093
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,218,340     1,218,340
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 412,794     412,794
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,218,340      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 412,794      
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 [2]       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     1,197,393
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 446,593     446,593
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990      
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 $ 446,593      
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 [2]       104,786
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,120,328
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,532,144
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,652,472     4,652,472
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 266,519     266,519
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,652,472      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 266,519      
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 [2]       124,260
Real Estate and Accumulated Depreciation, Carrying Amount of Land       993,015
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,547,434
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,540,449     3,540,449
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 197,204     197,204
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,540,449      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 197,204      
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 [2]       178,320
Real Estate and Accumulated Depreciation, Carrying Amount of Land       906,947
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,336,123
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,243,070     3,243,070
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 195,738     195,738
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,243,070      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 195,738      
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 [2]       139,490
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,268,707
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,219,301
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,488,008     4,488,008
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 253,100     253,100
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,488,008      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 253,100      
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 [2]       155,019
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,087,554
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,052,136
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,139,690     4,139,690
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 261,226     261,226
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,139,690      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 261,226      
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 [2]       307,187
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,548,542
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,819,229
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,367,771     5,367,771
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 336,889     336,889
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,367,771      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 336,889      
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 [2]       227,204
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,112,781
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,991,065
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,103,846     4,103,846
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 250,248     250,248
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,103,846      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 250,248      
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 [2]       720,249
Real Estate and Accumulated Depreciation, Carrying Amount of Land       359,933
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,157,365
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,517,298     2,517,298
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,093,532     1,093,532
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1984      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,517,298      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,093,532      
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 [2]       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     1,099,672
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 491,681     491,681
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 $ 491,681      
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 [2]       464,630
Real Estate and Accumulated Depreciation, Carrying Amount of Land       310,178
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,703,554
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,013,732     2,013,732
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 749,705     749,705
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1965      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,013,732      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 749,705      
Operating Properties [Member] | 1920 West Baseline Rd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Rialto, CA      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       9,361,943
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       17,970,709
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       163,942
Real Estate and Accumulated Depreciation, Carrying Amount of Land       9,413,260
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       18,083,334
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 27,496,594     27,496,594
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 511,799     511,799
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 27,496,594      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 511,799      
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 [2]       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     5,655,364
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,631,531     2,631,531
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 $ 2,631,531      
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 [2]       1,750,271
Real Estate and Accumulated Depreciation, Carrying Amount of Land       310,854
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,029,868
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,340,722     4,340,722
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,611,732     1,611,732
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1973      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,340,722      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,611,732      
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 [2]       2,041,659
Real Estate and Accumulated Depreciation, Carrying Amount of Land       693,203
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,125,152
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,818,355     7,818,355
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,754,522     3,754,522
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1975      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,818,355      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,754,522      
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]       2,328,283
Real Estate and Accumulated Depreciation, Carrying Amount of Land       256,203
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,877,932
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,134,135     5,134,135
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,381,870     2,381,870
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1976      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,134,135      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,381,870      
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 [2]       1,897,787
Real Estate and Accumulated Depreciation, Carrying Amount of Land       91,599
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,897,664
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,989,263     1,989,263
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 940,945     940,945
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1975      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,989,263      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 940,945      
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]       2,930,093
Real Estate and Accumulated Depreciation, Carrying Amount of Land       223,696
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,570,528
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,794,224     4,794,224
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,818,348     1,818,348
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1978      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,794,224      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,818,348      
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 [2]       1,438,114
Real Estate and Accumulated Depreciation, Carrying Amount of Land       325,303
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,823,671
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,148,974     4,148,974
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,099,998     2,099,998
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1979      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,148,974      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,099,998      
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 [2]       484,686
Real Estate and Accumulated Depreciation, Carrying Amount of Land       615,038
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,994,958
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,609,996     5,609,996
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,615,139     2,615,139
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,609,996      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,615,139      
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 [2]       514,146
Real Estate and Accumulated Depreciation, Carrying Amount of Land       454,056
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,243,888
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,697,944     3,697,944
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,762,300     1,762,300
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1987      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,697,944      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,762,300      
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 [2]       576,623
Real Estate and Accumulated Depreciation, Carrying Amount of Land       486,166
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,141,834
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,628,000     4,628,000
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,148,739     2,148,739
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1981      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,628,000      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,148,739      
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 [2]       1,007,798
Real Estate and Accumulated Depreciation, Carrying Amount of Land       474,360
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,486,444
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,960,804     4,960,804
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,462,073     2,462,073
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1982      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,960,804      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,462,073      
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 [2]       837,239
Real Estate and Accumulated Depreciation, Carrying Amount of Land       652,455
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,621,914
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,274,369     6,274,369
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,133,828     3,133,828
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,274,369      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,133,828      
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 [2]       575,220
Real Estate and Accumulated Depreciation, Carrying Amount of Land       404,616
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,542,407
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,947,023     3,947,023
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,855,985     1,855,985
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1985      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,947,023      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,855,985      
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]       2,230,770
Real Estate and Accumulated Depreciation, Carrying Amount of Land       452,263
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,522,651
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,974,914     5,974,914
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,752,400     2,752,400
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1978      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,974,914      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,752,400      
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 [2]       384,025
Real Estate and Accumulated Depreciation, Carrying Amount of Land       262,210
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,494,650
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,756,860     2,756,860
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,281,975     1,281,975
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,756,860      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,281,975      
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 [2]       703,776
Real Estate and Accumulated Depreciation, Carrying Amount of Land       486,598
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,786,878
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,273,476     5,273,476
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,206,063     2,206,063
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,273,476      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,206,063      
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]       2,613,277
Real Estate and Accumulated Depreciation, Carrying Amount of Land       334,772
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,545,388
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,880,160     2,880,160
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,175,333     1,175,333
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,880,160      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,175,333      
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 [2]       5,428,026
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,066,839
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,103,487
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,170,326     6,170,326
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,030,277     1,030,277
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,170,326      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,030,277      
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 [2]       622,829
Real Estate and Accumulated Depreciation, Carrying Amount of Land       489,941
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,215,729
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,705,670     4,705,670
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,060,587     2,060,587
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1989      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,705,670      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,060,587      
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 [2]       4,829,611
Real Estate and Accumulated Depreciation, Carrying Amount of Land       720,100
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,815,171
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,535,271     5,535,271
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,429,460     2,429,460
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1996      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,535,271      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,429,460      
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 [2]       353,257
Real Estate and Accumulated Depreciation, Carrying Amount of Land       644,384
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,378,737
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,023,121     5,023,121
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,313,416     2,313,416
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,023,121      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,313,416      
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 [2]       898,269
Real Estate and Accumulated Depreciation, Carrying Amount of Land       408,729
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,595,617
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,004,346     4,004,346
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,030,477     2,030,477
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,004,346      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,030,477      
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 [2]       5,983,122
Real Estate and Accumulated Depreciation, Carrying Amount of Land       700,503
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,977,263
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,677,766     6,677,766
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,512,221     2,512,221
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,677,766      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,512,221      
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 [2]       4,992,422
Real Estate and Accumulated Depreciation, Carrying Amount of Land       687,898
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,981,185
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,669,083     5,669,083
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,484,030     2,484,030
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,669,083      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,484,030      
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 [2]       7,490,092
Real Estate and Accumulated Depreciation, Carrying Amount of Land       901,666
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,461,327
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,362,993     8,362,993
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,463,596     1,463,596
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,362,993      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,463,596      
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 [2]       341,435
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,233,800
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       13,949,759
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 15,183,559     15,183,559
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,464,544     3,464,544
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 15,183,559      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,464,544      
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 [2]       4,966,941
Real Estate and Accumulated Depreciation, Carrying Amount of Land       335,061
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,937,701
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,272,762     5,272,762
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,134,859     2,134,859
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,272,762      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,134,859      
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 [2]       4,017,772
Real Estate and Accumulated Depreciation, Carrying Amount of Land       399,988
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,972,687
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,372,675     4,372,675
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,878,277     1,878,277
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1997      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,372,675      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,878,277      
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 [2]       321,135
Real Estate and Accumulated Depreciation, Carrying Amount of Land       895,811
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,325,324
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,221,135     7,221,135
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 765,554     765,554
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,221,135      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 765,554      
Operating Properties [Member] | 13220 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 [2]       11,072,977
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,396,324
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,185,185
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 11,581,509     11,581,509
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 565,894     565,894
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 11,581,509      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 565,894      
Operating Properties [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 [2]       10,464,170
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,066,159
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,446,104
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 11,512,263     11,512,263
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 475,964     475,964
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 11,512,263      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 475,964      
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 [2]       1,238,550
Real Estate and Accumulated Depreciation, Carrying Amount of Land       8,672,143
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       25,383,414
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 34,055,557     34,055,557
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,952,909     1,952,909
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 34,055,557      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,952,909      
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 [3]       0
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 [2]       485,780
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,884,492
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,925,573
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 13,810,065     13,810,065
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 937,836     937,836
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 13,810,065      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 937,836      
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 [2]       460,618
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,035,034
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,305,580
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,340,614     6,340,614
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 264,515     264,515
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,340,614      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 264,515      
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 [2]       177,768
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,263,237
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,810,978
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,074,215     4,074,215
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 202,652     202,652
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,074,215      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 202,652      
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 [2]       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     31,697,571
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 8,723,831     8,723,831
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 $ 8,723,831      
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 [2]       1,603
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,126,865
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,685,781
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,812,646     6,812,646
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 476,739     476,739
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,812,646      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 476,739      
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 [2]       207,768
Real Estate and Accumulated Depreciation, Carrying Amount of Land       887,285
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,528,968
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,416,253     6,416,253
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 535,233     535,233
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,416,253      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 535,233      
Operating Properties [Member] | 5651 Innovation Boulevard [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       1,551,579
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       9,541,234
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       543,939
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,552,083
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,084,669
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 11,636,752     11,636,752
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 32,531     32,531
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 11,636,752      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 32,531      
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 [2]       859,329
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,337,271
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,994,448
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,331,719     8,331,719
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 890,723     890,723
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,331,719      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 890,723      
Operating Properties [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 [2]       84,544,640
Real Estate and Accumulated Depreciation, Carrying Amount of Land       13,183,027
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       81,594,246
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 94,777,273     94,777,273
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,544,754     3,544,754
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 94,777,273      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,544,754      
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
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 [2]       332,505
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,964,140
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,999,772
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 12,963,912     12,963,912
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 763,594     763,594
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 12,963,912      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 763,594      
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 [2]       149,732
Real Estate and Accumulated Depreciation, Carrying Amount of Land       643,639
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,794,790
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,438,429     2,438,429
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 166,249     166,249
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,438,429      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 166,249      
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 [2]       118,858
Real Estate and Accumulated Depreciation, Carrying Amount of Land       672,500
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,407,782
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,080,282     2,080,282
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 143,293     143,293
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,080,282      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 143,293      
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 [2]       150,664
Real Estate and Accumulated Depreciation, Carrying Amount of Land       851,080
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,178,417
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,029,497     4,029,497
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 263,862     263,862
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,029,497      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 263,862      
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 [3]       0
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 [2]       165,205
Real Estate and Accumulated Depreciation, Carrying Amount of Land       283,474
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,396,072
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,679,546     2,679,546
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 183,883     183,883
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,679,546      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 183,883      
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 [3]       0
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 [2]       220,944
Real Estate and Accumulated Depreciation, Carrying Amount of Land       374,284
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,208,170
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,582,454     3,582,454
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 244,340     244,340
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,582,454      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 244,340      
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 [3]       0
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 [2]       990,605
Real Estate and Accumulated Depreciation, Carrying Amount of Land       699,797
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,205,043
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,904,840     6,904,840
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 442,736     442,736
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,904,840      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 442,736      
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 [2]       8,853,721
Real Estate and Accumulated Depreciation, Carrying Amount of Land       807,006
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       8,950,767
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 9,757,773     9,757,773
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,275,228     2,275,228
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,757,773      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,275,228      
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 [2]       6,711,340
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,628,635
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,686,096
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,314,731     7,314,731
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 547,431     547,431
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,314,731      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 547,431      
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 [2]       6,553,719
Real Estate and Accumulated Depreciation, Carrying Amount of Land       794,848
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,688,715
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,483,563     7,483,563
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,762,445     1,762,445
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,483,563      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,762,445      
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 [2]       765,470
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,675,402
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,845,013
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,520,415     7,520,415
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 532,350     532,350
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,520,415      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 532,350      
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 [2]       7,580,353
Real Estate and Accumulated Depreciation, Carrying Amount of Land       5,100,791
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       31,799,680
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 36,900,471     36,900,471
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 7,145,549     7,145,549
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 36,900,471      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 7,145,549      
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]       1,331,324
Real Estate and Accumulated Depreciation, Carrying Amount of Land       5,570,820
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,786,224
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 16,357,044     16,357,044
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,276,212     2,276,212
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2008      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 16,357,044      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,276,212      
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 [2]       464,995
Real Estate and Accumulated Depreciation, Carrying Amount of Land       659,825
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,061,241
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,721,066     3,721,066
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,307,680     1,307,680
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1991      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,721,066      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,307,680      
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 [2]       321,767
Real Estate and Accumulated Depreciation, Carrying Amount of Land       558,251
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,493,669
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,051,920     3,051,920
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,086,409     1,086,409
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1991      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,051,920      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,086,409      
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 [2]       1,583,476
Real Estate and Accumulated Depreciation, Carrying Amount of Land       359,540
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,045,326
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,404,866     3,404,866
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,284,683     1,284,683
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,404,866      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,284,683      
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 [2]       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     4,949,349
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,609,860     2,609,860
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 $ 2,609,860      
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 [2]       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     5,664,440
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,071,959     1,071,959
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 $ 1,071,959      
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 [2]       3,415,797
Real Estate and Accumulated Depreciation, Carrying Amount of Land       933,362
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,812,532
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,745,894     3,745,894
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 717,312     717,312
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,745,894      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 717,312      
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 [2]       1,359,333
Real Estate and Accumulated Depreciation, Carrying Amount of Land       503,767
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,146,918
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,650,685     4,650,685
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,152,879     2,152,879
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1986      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,650,685      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,152,879      
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 [2]       4,060
Real Estate and Accumulated Depreciation, Carrying Amount of Land       556,952
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,853,296
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,410,248     4,410,248
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 301,930     301,930
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,410,248      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 301,930      
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 [2]       50,142
Real Estate and Accumulated Depreciation, Carrying Amount of Land       201,600
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,313,273
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,514,873     1,514,873
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 110,882     110,882
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,514,873      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 110,882      
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 [2]       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     8,093,169
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 614,184     614,184
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 $ 614,184      
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 [2]       158,654
Real Estate and Accumulated Depreciation, Carrying Amount of Land       650,384
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,922,955
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,573,339     5,573,339
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 387,097     387,097
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,573,339      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 387,097      
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 [2]       3,207,575
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,071,535
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,171,462
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,242,997     4,242,997
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,226,680     1,226,680
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,242,997      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,226,680      
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]       2,983,337
Real Estate and Accumulated Depreciation, Carrying Amount of Land       619,913
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,983,337
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,603,250     3,603,250
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 994,644     994,644
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,603,250      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 994,644      
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]       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     2,960,032
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 938,891     938,891
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 $ 938,891      
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 [2]       3,443,706
Real Estate and Accumulated Depreciation, Carrying Amount of Land       556,887
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,385,417
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,942,304     3,942,304
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,326,867     1,326,867
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,942,304      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,326,867      
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]       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     2,828,102
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 793,887     793,887
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 $ 793,887      
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]       2,773,264
Real Estate and Accumulated Depreciation, Carrying Amount of Land       854,797
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,815,395
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,670,192     3,670,192
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 821,024     821,024
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2003      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,670,192      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 821,024      
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 [2]       13,996,216
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,560,099
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       13,379,286
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 14,939,385     14,939,385
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 5,534,518     5,534,518
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 14,939,385      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 5,534,518      
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 [2]       13,936,144
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,908,792
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       13,480,719
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 15,389,511     15,389,511
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,472,756     2,472,756
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 15,389,511      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,472,756      
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 [2]       3,671,449
Real Estate and Accumulated Depreciation, Carrying Amount of Land       900,508
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,669,825
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,570,333     4,570,333
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,174,725     1,174,725
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,570,333      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,174,725      
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 [2]       3,661,376
Real Estate and Accumulated Depreciation, Carrying Amount of Land       952,860
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,661,376
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,614,236     4,614,236
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,509,247     1,509,247
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,614,236      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,509,247      
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 [2]       1,009,365
Real Estate and Accumulated Depreciation, Carrying Amount of Land       262,416
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,521,949
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,784,365     2,784,365
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,304,741     1,304,741
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1981      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,784,365      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,304,741      
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 [2]       1,023,370
Real Estate and Accumulated Depreciation, Carrying Amount of Land       181,923
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,835,866
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,017,789     3,017,789
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,214,632     1,214,632
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1979      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,017,789      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,214,632      
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 [2]       3,932,756
Real Estate and Accumulated Depreciation, Carrying Amount of Land       661,680
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,690,759
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,352,439     4,352,439
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,561,830     1,561,830
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,352,439      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,561,830      
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 [2]       607,287
Real Estate and Accumulated Depreciation, Carrying Amount of Land       447,498
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,009,142
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,456,640     1,456,640
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 320,478     320,478
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,456,640      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 320,478      
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]       2,247,071
Real Estate and Accumulated Depreciation, Carrying Amount of Land       235,894
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,247,070
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,482,964     2,482,964
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 915,541     915,541
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,482,964      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 915,541      
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 [2]       3,723,937
Real Estate and Accumulated Depreciation, Carrying Amount of Land       771,501
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,505,771
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,277,272     4,277,272
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,390,660     1,390,660
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,277,272      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,390,660      
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]       3,073,105
Real Estate and Accumulated Depreciation, Carrying Amount of Land       506,949
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,923,520
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,430,469     3,430,469
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,258,756     1,258,756
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,430,469      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,258,756      
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 [2]       291,845
Real Estate and Accumulated Depreciation, Carrying Amount of Land       548,905
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,533,472
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,082,377     3,082,377
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 690,662     690,662
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,082,377      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 690,662      
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]       2,996,000
Real Estate and Accumulated Depreciation, Carrying Amount of Land       506,949
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,846,415
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,353,364     3,353,364
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,054,718     1,054,718
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,353,364      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,054,718      
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 [2]       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     3,962,646
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,218,548     1,218,548
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 $ 1,218,548      
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 [2]       1,163,832
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,408,478
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,411,078
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,819,556     7,819,556
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,047,605     3,047,605
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1990      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,819,556      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,047,605      
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]       2,455,064
Real Estate and Accumulated Depreciation, Carrying Amount of Land       438,061
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,367,409
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,805,470     2,805,470
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 929,186     929,186
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1999      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,805,470      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 929,186      
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 [2]       262,407
Real Estate and Accumulated Depreciation, Carrying Amount of Land       912,663
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,687,550
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,600,213     6,600,213
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 500,247     500,247
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,600,213      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 500,247      
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 [2]       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     4,392,776
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,039,535     2,039,535
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 $ 2,039,535      
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 [2]       166,431
Real Estate and Accumulated Depreciation, Carrying Amount of Land       655,668
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,298,507
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,954,175     4,954,175
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 402,947     402,947
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,954,175      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 402,947      
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 [2]       911,848
Real Estate and Accumulated Depreciation, Carrying Amount of Land       399,088
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,780,682
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,179,770     4,179,770
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,790,357     1,790,357
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,179,770      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,790,357      
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 [2]       488,717
Real Estate and Accumulated Depreciation, Carrying Amount of Land       820,882
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,811,437
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,632,319     3,632,319
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,140,983     1,140,983
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1996      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,632,319      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,140,983      
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 [2]       575,767
Real Estate and Accumulated Depreciation, Carrying Amount of Land       611,626
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,208,440
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,820,066     5,820,066
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,766,355     2,766,355
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1986      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,820,066      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,766,355      
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 [2]       779,800
Real Estate and Accumulated Depreciation, Carrying Amount of Land       4,304,102
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       24,467,978
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 28,772,080     28,772,080
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 6,695,647     6,695,647
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 28,772,080      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 6,695,647      
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 [2]       514,389
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,344,090
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       18,839,808
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 22,183,898     22,183,898
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 6,024,552     6,024,552
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 22,183,898      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 6,024,552      
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 [2]       1,003,930
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,167,958
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       20,130,077
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 23,298,035     23,298,035
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 6,006,145     6,006,145
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 23,298,035      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 6,006,145      
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 [2]       1,292,137
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,166,300
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       20,027,540
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 23,193,840     23,193,840
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 6,018,888     6,018,888
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 23,193,840      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 6,018,888      
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 [2]       505,869
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,050,548
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       11,678,768
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 13,729,316     13,729,316
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,644,718     2,644,718
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 13,729,316      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,644,718      
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 [2]       3,957,804
Real Estate and Accumulated Depreciation, Carrying Amount of Land       978,019
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,516,979
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,494,998     4,494,998
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,088,123     1,088,123
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,494,998      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,088,123      
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 [2]       1,811,678
Real Estate and Accumulated Depreciation, Carrying Amount of Land       364,514
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,657,005
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,021,519     2,021,519
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 818,366     818,366
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,021,519      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 818,366      
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 [2]       3,366,767
Real Estate and Accumulated Depreciation, Carrying Amount of Land       899,284
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,959,803
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,859,087     3,859,087
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 909,870     909,870
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,859,087      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 909,870      
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 [2]       4,254,173
Real Estate and Accumulated Depreciation, Carrying Amount of Land       840,314
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,914,250
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 4,754,564     4,754,564
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,821,995     1,821,995
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,754,564      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,821,995      
Operating Properties [Member] | 9020 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       1,718,496
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 [2]       912,448
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,718,496
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       12,609,829
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 14,328,325     14,328,325
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 981,612     981,612
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 14,328,325      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 981,612      
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 [2]       99,916
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,203,200
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       8,079,456
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 9,282,656     9,282,656
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 693,067     693,067
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,282,656      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 693,067      
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 [2]       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     5,813,945
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 577,865     577,865
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 $ 577,865      
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 [2]       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     3,753,809
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 651,502     651,502
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 $ 651,502      
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 [2]       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     4,790,709
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 334,320     334,320
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 $ 334,320      
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 [2]       140,998
Real Estate and Accumulated Depreciation, Carrying Amount of Land       374,548
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,495,798
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,870,346     1,870,346
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 125,032     125,032
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,870,346      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 125,032      
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 [2]       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     10,756,925
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 732,977     732,977
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 $ 732,977      
Operating Properties [Member] | 1720 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       2,629,020
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       15,771,140
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,629,020
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       15,771,140
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 18,400,160     18,400,160
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 93,842     93,842
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 18,400,160      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 93,842      
Operating Properties [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 [2]       23,047,658
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,975,600
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       23,047,658
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 27,023,258     27,023,258
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 204,220     204,220
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 27,023,258      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 204,220      
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 [3]       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 [2]       256,266
Real Estate and Accumulated Depreciation, Carrying Amount of Land       877,611
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       4,741,693
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,619,304     5,619,304
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 385,935     385,935
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,619,304      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 385,935      
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 [2]       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     3,507,149
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 226,546     226,546
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 $ 226,546      
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 [2]       481,037
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,192,820
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,061,193
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,254,013     3,254,013
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 300,746     300,746
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,254,013      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 300,746      
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 [2]       3,240,140
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,295,090
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       12,319,951
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 14,615,041     14,615,041
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,521,569     3,521,569
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 14,615,041      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,521,569      
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 [2]       277,291
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,574,912
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,585,312
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 9,160,224     9,160,224
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 768,598     768,598
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,160,224      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 768,598      
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 [2]       919,846
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,524,603
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,271,916
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,796,519     8,796,519
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 885,845     885,845
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,796,519      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 885,845      
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 [3]       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 [2]       372,752
Real Estate and Accumulated Depreciation, Carrying Amount of Land       435,776
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,248,438
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,684,214     2,684,214
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 235,227     235,227
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,684,214      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 235,227      
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 [3]       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 [2]       203,538
Real Estate and Accumulated Depreciation, Carrying Amount of Land       345,061
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,632,378
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,977,439     1,977,439
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 192,918     192,918
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,977,439      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 192,918      
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 [2]       1,469,287
Real Estate and Accumulated Depreciation, Carrying Amount of Land       16,558,660
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       33,693,265
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 50,251,925     50,251,925
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 5,441,896     5,441,896
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 50,251,925      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 5,441,896      
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 [2]       128,506
Real Estate and Accumulated Depreciation, Carrying Amount of Land       70,000,000
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       55,252,289
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 125,252,289     125,252,289
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 5,781,074     5,781,074
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 125,252,289      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 5,781,074      
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 [2]       8,912,626
Real Estate and Accumulated Depreciation, Carrying Amount of Land       5,223,660
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       9,904,633
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 15,128,293     15,128,293
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,241,802     4,241,802
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 15,128,293      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 4,241,802      
Operating Properties [Member] | 1500 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       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 [2]       32,326,215
Real Estate and Accumulated Depreciation, Carrying Amount of Land       11,636,499
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       28,977,271
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 40,613,770     40,613,770
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 10,604,538     10,604,538
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2002      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 40,613,770      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 10,604,538      
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 [2]       5,014,199
Real Estate and Accumulated Depreciation, Carrying Amount of Land       5,539,281
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       21,190,750
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 26,730,031     26,730,031
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 9,267,683     9,267,683
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1979      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 26,730,031      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 9,267,683      
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 [2]       1,041,424
Real Estate and Accumulated Depreciation, Carrying Amount of Land       845,846
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,850,449
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,696,295     8,696,295
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,246,127     3,246,127
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,696,295      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 3,246,127      
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 [2]       892,306
Real Estate and Accumulated Depreciation, Carrying Amount of Land       664,899
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,244,716
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,909,615     6,909,615
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,927,132     2,927,132
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1988      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,909,615      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,927,132      
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
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 [2]       73,377
Real Estate and Accumulated Depreciation, Carrying Amount of Land       578,314
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,521,939
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,100,253     3,100,253
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 178,750     178,750
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,100,253      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 178,750      
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 [2]       9,037,845
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,687,334
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       9,638,900
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 13,326,234     13,326,234
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,389,026     2,389,026
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 13,326,234      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,389,026      
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 [2]       11,517,219
Real Estate and Accumulated Depreciation, Carrying Amount of Land       4,003,074
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       12,911,884
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 16,914,958     16,914,958
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,766,912     2,766,912
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 16,914,958      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 2,766,912      
Operating Properties [Member] | Liberty Square, Block 1 [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       159,232
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       1,622,551
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       904,781
Real Estate and Accumulated Depreciation, Carrying Amount of Land       301,735
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,384,830
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,686,565     2,686,565
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 641,950     641,950
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,686,565      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 641,950      
Operating Properties [Member] | Liberty Square, Block 2 [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       199,150
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       1,614,217
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       936,652
Real Estate and Accumulated Depreciation, Carrying Amount of Land       377,377
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,372,642
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,750,019     2,750,019
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 615,641     615,641
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,750,019      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 615,641      
Operating Properties [Member] | Liberty Square, Block 3 [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       129,830
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       1,141,141
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       652,344
Real Estate and Accumulated Depreciation, Carrying Amount of Land       246,020
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,677,295
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,923,315     1,923,315
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 430,653     430,653
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,923,315      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 430,653      
Operating Properties [Member] | Liberty Square, Block 5 [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       71,377
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       735,993
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       409,677
Real Estate and Accumulated Depreciation, Carrying Amount of Land       135,255
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,081,792
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,217,047     1,217,047
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 279,593     279,593
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,217,047      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 279,593      
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 [3]       0
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 [2]       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     8,044,303
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 500,926     500,926
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 $ 500,926      
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 [3]       0
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 [2]       136,689
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,177,064
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,239,140
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,416,204     3,416,204
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 191,870     191,870
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,416,204      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 191,870      
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 [3]       0
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 [2]       164,118
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,029,595
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,892,305
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,921,900     2,921,900
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 164,308     164,308
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,921,900      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 164,308      
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 [3]       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 [2]       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     31,145,979
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,739,999     1,739,999
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 $ 1,739,999      
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 [3]       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 [2]       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     16,592,463
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 925,347     925,347
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 $ 925,347      
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
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 [2]       537,830
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,051,088
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       18,821,316
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 20,872,404     20,872,404
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,304,019     1,304,019
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 20,872,404      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation 1,304,019      
Operating Properties [Member] | Subtotal Operating Real Estate [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Amount of Encumbrances [1]       55,484,649
Real Estate and Accumulated Depreciation, Initial Cost of Land       1,114,603,612
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       2,652,302,317
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       2,549,669,062
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,184,927,226
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,131,647,765
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 6,316,574,991     6,316,574,991
Real Estate and Accumulated Depreciation, Accumulated Depreciation 1,148,928,324     1,148,928,324
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross 6,316,574,991      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 1,148,928,324      
Operating Properties [Member] | Maximum [Member] | 627 Distribution Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1467 Perryman Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1501 Perryman Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 869 S Route 53 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 901 S Route 53 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 200 Boulder Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 250 Boulder Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 400 Nestle Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 650 Boulder Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 651 Boulder Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 700 Nestle Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 705 Boulder Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7165 Ambassador Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7248 Industrial Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7339 Industrial Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7437 Industrial Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8014 Industrial Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8150 Industrial Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8250 Industrial Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8400 Industrial Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6330 Hedgewood Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6350 Hedgewood Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6370 Hedgewood Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6390 Hedgewood Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6520 Stonegate Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6540 Stonegate Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6560 Stonegate Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6580 Snowdrift Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7620 Cetronia Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3095 Presidential Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3097 Presidential Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7030 Buford Highway NE [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | Barton 150 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1055-1071 Kingsland Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4606 Richlynn Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 11800 Baltimore Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 11850 Baltimore Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 11900 Baltimore Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 12104 Indian Creek Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 12200 Indian Creek Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 12240 Indian Creek Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1071 Thorndale Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1260-1274 Ellis Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 371-377 Meyer Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 850-880 Devon Ave [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10 Emery Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2785 Commerce Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 74 West Broad Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10801 Nesbitt Avenue South [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5705 Old Shakopee Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5715 Old Shakopee Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5735 Old Shakopee Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5775 West Old Shakopee Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6161 Green Valley Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6601-6625 W. 78th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 750 Park of Commerce Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 777 Yamato Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 951 Broken Sound Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1455 Remington Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 150 E Crossroads Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 553 S Joliet Ave [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 400 Boulder Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8201 Industrial Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8500 Industrial Bouldvard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 860 Nestle Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1485 W Commerce Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 40 Logistics Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 135-195 East Elk Trail [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 515 Kehoe Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1413 Bradley Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3200 Belmeade Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1475 Nitterhouse Dr [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 95 Kriner Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 9000 109th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 11701 Goodrich Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 12810 Virkler Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2700 Hutchinson McDonald Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2701 Hutchinson McDonald Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2730 Hutchinson McDonald Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2801 Hutchinson McDonald Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3000 Crosspoint Center Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3005 Crosspoint Center Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4045 Perimeter West Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4047 Perimeter West Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4525 Statesville Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4835 Sirona Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4925 Sirona Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5033 Sirona Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5039 Sirona Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8910 Pioneer Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8916 Pioneer Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2601 Indian River Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1540 S 54th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4650 Lake Forest Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4750 Lake Forest Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 9645 Gerwig Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2550 John Glenn Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3800 Twin Creeks Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 330 South Royal Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 455 Airline Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2130 Baldwin Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 329-333 Herrod Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1250 Hall Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 301-321 S Goolsby Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1680 Executive Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1700 Executive Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2670 Breckinridge Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 170 Parkway West [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 190 Parkway West [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 265 Parkway East [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 285 Parkway East [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1000 Parliament Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4226 Surles Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4227 Surles Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4234 Surles Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4300 Emperor Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3169 Dodd Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3711 Kennebec Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 917 Lone Oak Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10301-10305 West 70th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10321 West 70th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10333 West 70th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10349-10357 West 70th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10365-10375 West 70th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10393-10394 West 70th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10400 Viking Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7075 Flying Cloud Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7078 Shady Oak Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7615 Smetana Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7625 Smetana Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7695-7699 Anagram Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7777 Golden Triangle Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7800 Equitable Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7905 Fuller Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8855 Columbine Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8911 Columbine Road (B2) [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8937 Columbine Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8967 Columbine Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8995 Columbine Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 9023 Columbine Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2250 Arthur Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6600 Business Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6675 Business Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7351 Coca Cola Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 21705-21707 Mississippi Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 27143 S Baseline Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1800 Donaldson Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 180 Sheree Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6880 Fairfield Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7000-7018 Fairfield Business [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10721 Jasmine Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2000 Southpointe Dr [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1400 NW 65th Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6500 NW 12th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6501 NW 12th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6600 NW 12th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5400 Alliance Gateway Freeway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 9601 Cosner Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5410 - 5430 Northwest 33rd Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 12601 Industry Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 12641 Industry Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 12681-12691 Pala Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 850 S Jupiter Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2510 W Main Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4251 North Highway 121 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 116 Pleasant Ridge Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 25 Brookfield Oaks Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 45 Brookfield Oaks Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2011 Southtech Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2121 Southtech Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 800 Commerce Parkway West Dr [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 110 Caliber Ridge Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 140 Caliber Ridge Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1487 South Highway 101 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2727 London Grove Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 11835 Newgate Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 11841 Newgate Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1560 Hunter Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1575 Hunter Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7361 Coca Cola Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7460 New Ridge Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7462 New Ridge Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 500 McCarthy Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 600 Industrial Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7195 Grayson Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7253 Grayson Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 12537 Cerise Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1010 Petersburg Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 785 Lindbergh Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 805 Lindbergh Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 825 Lindbergh Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 845 Lindbergh Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1498 Eagle Hill Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4183 Eagle Hill Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4189 Eagle Hill Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4195 Eagle Hill Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4328, 4336 Federal Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4344 Federal Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4380 Federal Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4388 Federal Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4475 Premier Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4500 Green Point Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4501 Green Point Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4523 Green Point Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4524 Green Point Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | Unit 5 Logix Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1515 6th Street South [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1600 5th Street South [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1000 South Loop West [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10241 W Little York Rd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10245 W Little York Rd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10301 Round Up Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10305 Round Up Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1050 Greens Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10607 Haddington Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10735 West Little York Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10739 West Little York Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 11201 Greens Crossing Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 11220 Ella Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1283 N Post Oak Rd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1287 N Post Oak Rd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1291 N Post Oak Rd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1416 N Sam Houston Parkway E [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1420 N Sam Houston Parkway E [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 14200 Hollister Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1424 N Sam Houston Parkway E [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1428 N Sam Houston Parkway E [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 14300 Hollister Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 14400 Hollister Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 15102 Sommermeyer St [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 15150 Sommermeyer St [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 16330 Central Green Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 16405 Air Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 16420 West Hardy Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 16445 Air Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1646 Rankin Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1655 Townhurst Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 16580 Air Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 16602 Central Green Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 16605 Air Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1665 Townhurst Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 16680 Central Green Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 16685 Air Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1755 Trans Central Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4301 S Pinemont Dr [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4401 S Pinemont Dr [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4501 S Pinemont Dr [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5200 N. Sam Houston Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5250 N. Sam Houston Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5500 N. Sam Houston Parkway West [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8017 Pinemont Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8272 El Rio Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8282 El Rio Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8301 Fallbrook Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8303 Fallbrook Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 850 Greens Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 860 Greens Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8801-19 & 8821-49 Fallbrook Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8802-8824 Fallbrook Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8825-8839 N Sam Houston Pkwy [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8850-8872 Fallbrook Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | Liberty 11 at Central Green [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | Cabot III UK1B01 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1011 N Hilltop Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1035 N Hilltop Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1549 W Glenlake Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 901 N Hilltop Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 925 N Hilltop Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8241 Sandy Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8242 Sandy Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8246 Sandy Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1305 Chastain Road NW [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1325 Chastain Road NW [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3600 Cobb International Bld NW [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | Unit 1 Bear Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 151 South Warner Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2100 Renaissance Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2201 Renaissance Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2300 Renaissance Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2301 Renaissance Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2500 Renaissance Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2520 Renaissance Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2560 Renaissance Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2700 Horizon Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2900 Horizon Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3000 Horizon Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3100 Horizon Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3200 Horizon Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3400 Horizon Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3500 Horizon Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3600 Horizon Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3602 Horizon Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3604 Horizon Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 440 East Swedesford Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 460 East Swedesford Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 650 Swedesford Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 680 Swedesford Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1700 Interstate Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5801 Columbia Park Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 11425 State Highway 225 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 11503 State Highway 225 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1701 South 16th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1842 South 16th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1902 South 16th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 640 S State Road 39 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7528 Walker Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8301 Industrial Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8500 Willard Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 875 Maxham Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7533 Industrial Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1 Country View Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10, 20 Liberty Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 100 Chesterfield Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1001 Cedar Hollow Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 11 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 11,15 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 12,14,16 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 14 Lee Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 155 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 18 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2 West Liberty Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 20 Valley Stream Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 200 Chesterfield Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 257-275 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 27-43 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 277-293 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3 Country View Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 30 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 300 Technology Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 300-400 Chesterfield Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 311 Technology Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 333 Phoenixville Pike [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 40 Liberty Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 40 Valley Stream Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 420 Lapp Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 425 Old Morehall Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 425 Technology Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 45 Liberty Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 45-67 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 50 Morehall Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 50 Valley Stream Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 500 Chesterfield Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 508 Lapp Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 510 Lapp Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 55 Valley Stream Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 60 Morehall Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 600 Chesterfield Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 65 Valley Stream Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 700 Chesterfield Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 75 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 77-123 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1169 Canton Rd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 65 Brookfield Oaks Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 75 Brookfield Oaks Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 126-132 Liberty Industrial Pkw [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 95-115 Liberty Industrial Pkwy [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 11150 NW 122nd Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 11401 NW 134th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 11450 NW 122nd Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 12501 & 12701 Whitewater Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 12800 Whitewater Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 12900 Whitewater Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 456 International Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3100 SW 145th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3350 SW 148th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3400 Lakeside Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3450 Lakeside Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 21 S Middlesex Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4 S Middlesex Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 22750 Cactus Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 323 Park Knoll Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 324 Park Knoll Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 619 Distribution Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 701 Distribution Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 220 Lake Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 222 Lake Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10020 South Reinhart Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1879 Lamont Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 350 Winmeyer Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4000 E Airport Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1000 Gills Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10003 Satellite Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10511 & 10611 Satellite Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 10771 Palm Bay Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1090 Gills Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1400-1440 Central Florida Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1902 Cypress Lake Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2000 Park Oaks Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2202 Taft-Vineland Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2212 Taft Vineland Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2256 Taft-Vineland Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2351 Investors Row [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2400 South Lake Orange Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2412 Sand Lake Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2416 Lake Orange Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6200 Lee Vista Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6501 Lee Vista Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6918 Presidents Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6923 Lee Vista Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7022 TPC Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7100 TPC Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7101 TPC Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7315 Kingspointe Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 851 Gills Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 950 Gills Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 9550 Satellite Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 9600 Satellite Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 9700 Satellite Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1 Crescent Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 150 Rouse Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 201 Rouse Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3 Crescent Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4000 S 26th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4050 S 26th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4300 South 26th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4751 League Island Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4775 League Island Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5 Crescent Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8th & Walnut Streets [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2626 South 7th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4207 E. Cotton Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4217 E. Cotton Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4303 E. Cotton Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4313 E. Cotton Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4405 E. Cotton Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4410 E. Cotton Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4415 E. Cotton Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4425 E. Cotton Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4435 E. Cotton Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4450 South 44th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4610 South 44th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4750 S. 44th Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 563 South 63rd Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 9801 South 51st Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | Cotton Center Building 18 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1000 Klein Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1901 10th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1909 10th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3605 East Plano Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3701 East Plano Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 800 Klein Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 900 Klein Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 9801 80th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 14630-14650 28th Avenue North [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2920 Northwest Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5905 Trenton Lane North [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6055 Nathan Lane North [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1400 SW 6th Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1405 SW 6th Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1500 SW 5th Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1501 SW 5th Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1601 SW 5th Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1651 SW 5th Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2201-2215 NW 30th Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2250-2270 NW 30th Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2280-2300 NW 30th Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2301-2329 NW 30th Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3000 NW 25th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3001-3037 NW 25th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3012-3050 NW 25th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 595 SW 13th Terrace [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 601 SW 13th Terrace [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 605 SW 16th Terrace [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1920 West Baseline Rd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 301 Hill Carter Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4101-4127 Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4201-4261 Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4263-4299 Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4263F-N. Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4301-4335 Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4337-4379 Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4401-4445 Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4447-4491 Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4501-4549 Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4551-4593 Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4601-4643 Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4645-4683 Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4717-4729 Eubank Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 510 Eastpark Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 520 Eastpark Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 530 Eastpark Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 540 Eastpark Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5600-5626 Eastport Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5601-5659 Eastport Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5650-5674 Eastport Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5700 Eastport Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5701-5799 Eastport Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5900 Eastport Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6000 Eastport Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2020 US Highway 301 South [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6530 Judge Adams Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6532 Judge Adams Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 13098 George Weber Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 13220 Wilfred Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 13225 Brockton Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1070 Windham Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1550 Central Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1135 Aviation Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8715 Bollman Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8501 East Raintree Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1150 Gateway Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5555 12th Avenue East [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5651 Innovation Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1210 Champion Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 9300 Old Scotland Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3990 Heritage Oak Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3654-3668 Swenson Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3701 Illinois Ave [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3950-3980 Swenson Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1501 102nd Avenue North [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1527 102nd Avenue North [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1551 102nd Avenue North [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6900 Harbor View Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6920 Harbour View Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 6950 Harbour View Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1516 Fryar Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1301 International Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 13621 NW 12th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 13630 NW 8th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 13650 NW 8th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 111 Kelsey Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 131 Kelsey Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 150-182 Kelsey Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 200-34 Kelsey Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3102,3104,3110 Cherry Palm Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3401-3409 Cragmont Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3502 Roga Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3505 Cragmont Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 3608 Queen Palm Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4502 Woodland Corporate Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4503 Woodland Corporate Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4505 Woodland Corporate Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4508 Woodland Corporate Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4511 Woodland Corporate Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4520 Seedling Circle [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4630 Woodland Corporate Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 4631 Woodland Corporate Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 501 US Highway 301 South [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5250 Eagle Trail Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5501-5519 Pioneer Park Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5690-5694 Crenshaw Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 701-725 South US Hwy 301 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7621 Bald Cypress Place (Bldg N) [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7724 Woodland Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7725 Woodland Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7802-50 Woodland Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7851-7861 Woodland Center Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7852-98 Woodland Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7920 Woodland Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 7930, 8010-20 Woodland Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8001 Woodland Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8110 Anderson Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8112-42 Woodland Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8130 Anderson Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8154-8198 Woodland Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8212 Woodland Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8401-8408 Benjamin Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8705 Henderson Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8715 Henderson Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8725 Henderson Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8735 Henderson Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8745 Henderson Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8900-34 Brittany Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 9001-9015 Brittany Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 9002-9036 Brittany Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 901-933 US Highway 301 South [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 9020 King Palm Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 9110 King Palm Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 9203 King Palm Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 9306-24 East Broadway Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 9319 Peach Palm Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 9704 Solar Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 9945 Currie Davis Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1720 W Rio Salado Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1850 W Rio Salado Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1858 E Encanto Dr [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 475 W Vaughn St [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 921 South Park Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8313 West Pierce Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8591 West Washington [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 8601 West Washington [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5111 S Royal Atlanta Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 5151 S Royal Atlanta Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1100 17th Street NW [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2100 M Street NW [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1200 Liberty Ridge Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1500 Liberty Ridge Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 825 Duportail Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 400-500 Brandywine Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 600 Brandywine Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1400 Powis Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1 Kings Hill Aveune [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 42 Kings Hill Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | Liberty Square, Block 1 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | Liberty Square, Block 2 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | Liberty Square, Block 3 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | Liberty Square, Block 5 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 1400 Northpoint Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 300 Northpoint Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 400 Northpoint Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2935 West Corporate Lakes Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 2945 West Corporate Lakes Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Maximum [Member] | 43-47 Hintz Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Operating Properties [Member] | Minimum [Member] | 627 Distribution Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1467 Perryman Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1501 Perryman Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 869 S Route 53 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 901 S Route 53 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 200 Boulder Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 250 Boulder Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 400 Nestle Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 650 Boulder Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 651 Boulder Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 700 Nestle Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 705 Boulder Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7165 Ambassador Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7248 Industrial Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7339 Industrial Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7437 Industrial Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8014 Industrial Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8150 Industrial Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8250 Industrial Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8400 Industrial Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6330 Hedgewood Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6350 Hedgewood Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6370 Hedgewood Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6390 Hedgewood Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6520 Stonegate Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6540 Stonegate Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6560 Stonegate Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6580 Snowdrift Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7620 Cetronia Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3095 Presidential Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3097 Presidential Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7030 Buford Highway NE [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | Barton 150 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1055-1071 Kingsland Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4606 Richlynn Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 11800 Baltimore Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 11850 Baltimore Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 11900 Baltimore Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 12104 Indian Creek Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 12200 Indian Creek Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 12240 Indian Creek Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1071 Thorndale Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1260-1274 Ellis Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 371-377 Meyer Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 850-880 Devon Ave [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10 Emery Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2785 Commerce Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 74 West Broad Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10801 Nesbitt Avenue South [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5705 Old Shakopee Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5715 Old Shakopee Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5735 Old Shakopee Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5775 West Old Shakopee Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6161 Green Valley Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6601-6625 W. 78th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 750 Park of Commerce Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 777 Yamato Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 951 Broken Sound Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1455 Remington Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 150 E Crossroads Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 553 S Joliet Ave [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 400 Boulder Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8201 Industrial Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8500 Industrial Bouldvard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 860 Nestle Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1485 W Commerce Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 40 Logistics Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 135-195 East Elk Trail [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 515 Kehoe Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1413 Bradley Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3200 Belmeade Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1475 Nitterhouse Dr [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 95 Kriner Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 9000 109th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 11701 Goodrich Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 12810 Virkler Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2700 Hutchinson McDonald Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2701 Hutchinson McDonald Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2730 Hutchinson McDonald Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2801 Hutchinson McDonald Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3000 Crosspoint Center Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3005 Crosspoint Center Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4045 Perimeter West Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4047 Perimeter West Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4525 Statesville Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4835 Sirona Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4925 Sirona Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5033 Sirona Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5039 Sirona Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8910 Pioneer Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8916 Pioneer Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2601 Indian River Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1540 S 54th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4650 Lake Forest Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4750 Lake Forest Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 9645 Gerwig Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2550 John Glenn Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3800 Twin Creeks Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 330 South Royal Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 455 Airline Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2130 Baldwin Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 329-333 Herrod Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1250 Hall Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 301-321 S Goolsby Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1680 Executive Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1700 Executive Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2670 Breckinridge Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 170 Parkway West [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 190 Parkway West [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 265 Parkway East [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 285 Parkway East [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1000 Parliament Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4226 Surles Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4227 Surles Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4234 Surles Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4300 Emperor Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3169 Dodd Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3711 Kennebec Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 917 Lone Oak Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10301-10305 West 70th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10321 West 70th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10333 West 70th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10349-10357 West 70th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10365-10375 West 70th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10393-10394 West 70th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10400 Viking Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7075 Flying Cloud Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7078 Shady Oak Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7615 Smetana Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7625 Smetana Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7695-7699 Anagram Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7777 Golden Triangle Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7800 Equitable Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7905 Fuller Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8855 Columbine Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8911 Columbine Road (B2) [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8937 Columbine Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8967 Columbine Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8995 Columbine Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 9023 Columbine Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2250 Arthur Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6600 Business Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6675 Business Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7351 Coca Cola Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 21705-21707 Mississippi Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 27143 S Baseline Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1800 Donaldson Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 180 Sheree Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6880 Fairfield Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7000-7018 Fairfield Business [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10721 Jasmine Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2000 Southpointe Dr [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1400 NW 65th Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6500 NW 12th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6501 NW 12th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6600 NW 12th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5400 Alliance Gateway Freeway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 9601 Cosner Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5410 - 5430 Northwest 33rd Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 12601 Industry Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 12641 Industry Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 12681-12691 Pala Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 850 S Jupiter Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2510 W Main Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4251 North Highway 121 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 116 Pleasant Ridge Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 25 Brookfield Oaks Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 45 Brookfield Oaks Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2011 Southtech Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2121 Southtech Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 800 Commerce Parkway West Dr [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 110 Caliber Ridge Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 140 Caliber Ridge Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1487 South Highway 101 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2727 London Grove Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 11835 Newgate Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 11841 Newgate Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1560 Hunter Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1575 Hunter Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7361 Coca Cola Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7460 New Ridge Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7462 New Ridge Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 500 McCarthy Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 600 Industrial Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7195 Grayson Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7253 Grayson Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 12537 Cerise Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1010 Petersburg Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 785 Lindbergh Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 805 Lindbergh Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 825 Lindbergh Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 845 Lindbergh Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1498 Eagle Hill Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4183 Eagle Hill Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4189 Eagle Hill Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4195 Eagle Hill Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4328, 4336 Federal Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4344 Federal Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4380 Federal Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4388 Federal Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4475 Premier Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4500 Green Point Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4501 Green Point Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4523 Green Point Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4524 Green Point Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | Unit 5 Logix Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1515 6th Street South [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1600 5th Street South [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1000 South Loop West [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10241 W Little York Rd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10245 W Little York Rd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10301 Round Up Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10305 Round Up Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1050 Greens Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10607 Haddington Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10735 West Little York Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10739 West Little York Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 11201 Greens Crossing Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 11220 Ella Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1283 N Post Oak Rd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1287 N Post Oak Rd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1291 N Post Oak Rd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1416 N Sam Houston Parkway E [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1420 N Sam Houston Parkway E [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 14200 Hollister Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1424 N Sam Houston Parkway E [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1428 N Sam Houston Parkway E [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 14300 Hollister Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 14400 Hollister Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 15102 Sommermeyer St [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 15150 Sommermeyer St [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 16330 Central Green Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 16405 Air Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 16420 West Hardy Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 16445 Air Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1646 Rankin Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1655 Townhurst Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 16580 Air Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 16602 Central Green Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 16605 Air Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1665 Townhurst Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 16680 Central Green Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 16685 Air Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1755 Trans Central Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4301 S Pinemont Dr [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4401 S Pinemont Dr [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4501 S Pinemont Dr [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5200 N. Sam Houston Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5250 N. Sam Houston Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5500 N. Sam Houston Parkway West [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8017 Pinemont Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8272 El Rio Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8282 El Rio Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8301 Fallbrook Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8303 Fallbrook Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 850 Greens Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 860 Greens Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8801-19 & 8821-49 Fallbrook Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8802-8824 Fallbrook Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8825-8839 N Sam Houston Pkwy [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8850-8872 Fallbrook Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | Liberty 11 at Central Green [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | Cabot III UK1B01 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1011 N Hilltop Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1035 N Hilltop Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1549 W Glenlake Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 901 N Hilltop Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 925 N Hilltop Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8241 Sandy Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8242 Sandy Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8246 Sandy Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1305 Chastain Road NW [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1325 Chastain Road NW [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3600 Cobb International Bld NW [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | Unit 1 Bear Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 151 South Warner Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2100 Renaissance Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2201 Renaissance Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2300 Renaissance Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2301 Renaissance Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2500 Renaissance Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2520 Renaissance Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2560 Renaissance Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2700 Horizon Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2900 Horizon Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3000 Horizon Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3100 Horizon Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3200 Horizon Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3400 Horizon Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3500 Horizon Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3600 Horizon Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3602 Horizon Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3604 Horizon Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 440 East Swedesford Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 460 East Swedesford Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 650 Swedesford Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 680 Swedesford Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1700 Interstate Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5801 Columbia Park Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 11425 State Highway 225 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 11503 State Highway 225 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1701 South 16th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1842 South 16th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1902 South 16th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 640 S State Road 39 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7528 Walker Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8301 Industrial Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8500 Willard Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 875 Maxham Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7533 Industrial Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1 Country View Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10, 20 Liberty Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 100 Chesterfield Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1001 Cedar Hollow Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 11 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 11,15 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 12,14,16 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 14 Lee Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 155 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 18 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2 West Liberty Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 20 Valley Stream Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 200 Chesterfield Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 257-275 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 27-43 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 277-293 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3 Country View Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 30 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 300 Technology Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 300-400 Chesterfield Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 311 Technology Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 333 Phoenixville Pike [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 40 Liberty Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 40 Valley Stream Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 420 Lapp Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 425 Old Morehall Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 425 Technology Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 45 Liberty Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 45-67 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 50 Morehall Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 50 Valley Stream Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 500 Chesterfield Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 508 Lapp Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 510 Lapp Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 55 Valley Stream Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 60 Morehall Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 600 Chesterfield Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 65 Valley Stream Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 700 Chesterfield Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 75 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 77-123 Great Valley Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1169 Canton Rd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 65 Brookfield Oaks Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 75 Brookfield Oaks Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 126-132 Liberty Industrial Pkw [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 95-115 Liberty Industrial Pkwy [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 11150 NW 122nd Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 11401 NW 134th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 11450 NW 122nd Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 12501 & 12701 Whitewater Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 12800 Whitewater Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 12900 Whitewater Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 456 International Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3100 SW 145th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3350 SW 148th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3400 Lakeside Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3450 Lakeside Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 21 S Middlesex Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4 S Middlesex Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 22750 Cactus Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 323 Park Knoll Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 324 Park Knoll Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 619 Distribution Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 701 Distribution Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 220 Lake Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 222 Lake Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10020 South Reinhart Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1879 Lamont Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 350 Winmeyer Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4000 E Airport Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1000 Gills Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10003 Satellite Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10511 & 10611 Satellite Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 10771 Palm Bay Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1090 Gills Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1400-1440 Central Florida Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1902 Cypress Lake Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2000 Park Oaks Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2202 Taft-Vineland Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2212 Taft Vineland Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2256 Taft-Vineland Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2351 Investors Row [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2400 South Lake Orange Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2412 Sand Lake Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2416 Lake Orange Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6200 Lee Vista Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6501 Lee Vista Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6918 Presidents Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6923 Lee Vista Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7022 TPC Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7100 TPC Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7101 TPC Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7315 Kingspointe Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 851 Gills Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 950 Gills Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 9550 Satellite Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 9600 Satellite Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 9700 Satellite Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1 Crescent Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 150 Rouse Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 201 Rouse Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3 Crescent Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4000 S 26th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4050 S 26th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4300 South 26th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4751 League Island Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4775 League Island Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5 Crescent Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8th & Walnut Streets [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2626 South 7th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4207 E. Cotton Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4217 E. Cotton Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4303 E. Cotton Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4313 E. Cotton Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4405 E. Cotton Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4410 E. Cotton Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4415 E. Cotton Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4425 E. Cotton Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4435 E. Cotton Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4450 South 44th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4610 South 44th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4750 S. 44th Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 563 South 63rd Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 9801 South 51st Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | Cotton Center Building 18 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1000 Klein Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1901 10th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1909 10th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3605 East Plano Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3701 East Plano Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 800 Klein Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 900 Klein Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 9801 80th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 14630-14650 28th Avenue North [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2920 Northwest Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5905 Trenton Lane North [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6055 Nathan Lane North [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1400 SW 6th Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1405 SW 6th Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1500 SW 5th Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1501 SW 5th Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1601 SW 5th Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1651 SW 5th Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2201-2215 NW 30th Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2250-2270 NW 30th Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2280-2300 NW 30th Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2301-2329 NW 30th Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3000 NW 25th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3001-3037 NW 25th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3012-3050 NW 25th Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 595 SW 13th Terrace [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 601 SW 13th Terrace [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 605 SW 16th Terrace [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1920 West Baseline Rd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 301 Hill Carter Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4101-4127 Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4201-4261 Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4263-4299 Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4263F-N. Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4301-4335 Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4337-4379 Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4401-4445 Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4447-4491 Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4501-4549 Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4551-4593 Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4601-4643 Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4645-4683 Carolina Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4717-4729 Eubank Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 510 Eastpark Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 520 Eastpark Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 530 Eastpark Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 540 Eastpark Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5600-5626 Eastport Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5601-5659 Eastport Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5650-5674 Eastport Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5700 Eastport Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5701-5799 Eastport Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5900 Eastport Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6000 Eastport Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2020 US Highway 301 South [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6530 Judge Adams Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6532 Judge Adams Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 13098 George Weber Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 13220 Wilfred Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 13225 Brockton Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1070 Windham Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1550 Central Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1135 Aviation Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8715 Bollman Place [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8501 East Raintree Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1150 Gateway Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5555 12th Avenue East [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5651 Innovation Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1210 Champion Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 9300 Old Scotland Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3990 Heritage Oak Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3654-3668 Swenson Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3701 Illinois Ave [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3950-3980 Swenson Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1501 102nd Avenue North [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1527 102nd Avenue North [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1551 102nd Avenue North [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6900 Harbor View Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6920 Harbour View Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 6950 Harbour View Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1516 Fryar Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1301 International Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 13621 NW 12th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 13630 NW 8th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 13650 NW 8th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 111 Kelsey Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 131 Kelsey Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 150-182 Kelsey Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 200-34 Kelsey Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3102,3104,3110 Cherry Palm Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3401-3409 Cragmont Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3502 Roga Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3505 Cragmont Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 3608 Queen Palm Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4502 Woodland Corporate Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4503 Woodland Corporate Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4505 Woodland Corporate Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4508 Woodland Corporate Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4511 Woodland Corporate Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4520 Seedling Circle [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4630 Woodland Corporate Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 4631 Woodland Corporate Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 501 US Highway 301 South [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5250 Eagle Trail Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5501-5519 Pioneer Park Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5690-5694 Crenshaw Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 701-725 South US Hwy 301 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7621 Bald Cypress Place (Bldg N) [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7724 Woodland Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7725 Woodland Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7802-50 Woodland Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7851-7861 Woodland Center Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7852-98 Woodland Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7920 Woodland Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 7930, 8010-20 Woodland Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8001 Woodland Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8110 Anderson Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8112-42 Woodland Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8130 Anderson Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8154-8198 Woodland Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8212 Woodland Center Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8401-8408 Benjamin Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8705 Henderson Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8715 Henderson Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8725 Henderson Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8735 Henderson Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8745 Henderson Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8900-34 Brittany Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 9001-9015 Brittany Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 9002-9036 Brittany Way [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 901-933 US Highway 301 South [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 9020 King Palm Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 9110 King Palm Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 9203 King Palm Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 9306-24 East Broadway Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 9319 Peach Palm Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 9704 Solar Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 9945 Currie Davis Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1720 W Rio Salado Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1850 W Rio Salado Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1858 E Encanto Dr [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 475 W Vaughn St [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 921 South Park Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8313 West Pierce Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8591 West Washington [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 8601 West Washington [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5111 S Royal Atlanta Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 5151 S Royal Atlanta Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1100 17th Street NW [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2100 M Street NW [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1200 Liberty Ridge Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1500 Liberty Ridge Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 825 Duportail Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 400-500 Brandywine Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 600 Brandywine Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1400 Powis Court [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1 Kings Hill Aveune [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 42 Kings Hill Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | Liberty Square, Block 1 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | Liberty Square, Block 2 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | Liberty Square, Block 3 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | Liberty Square, Block 5 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 1400 Northpoint Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 300 Northpoint Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 400 Northpoint Parkway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2935 West Corporate Lakes Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 2945 West Corporate Lakes Blvd [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Operating Properties [Member] | Minimum [Member] | 43-47 Hintz Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation 5 years      
Development in Progress [Member] | 8620 Congdon Hill Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Alburtis, PA      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       38,328,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       11,489,588
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       49,817,588
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 49,817,588     49,817,588
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 49,817,588      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 800 Uline 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       14,754,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       12,639,279
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       27,393,279
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 27,393,279     27,393,279
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 27,393,279      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 700 Uline 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       26,311,300
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       30,292,697
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       56,603,997
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 56,603,997     56,603,997
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 56,603,997      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 3225 Gravel Springs Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Buford, GA      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       2,807,020
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       277,833
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,084,853
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,084,853     3,084,853
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,084,853      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 3525 Gravel Springs Road [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Buford, GA      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       1,391,065
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       182,177
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,573,242
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,573,242     1,573,242
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,573,242      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 5032 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       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       1,416,763
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       7,275,237
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       8,692,000
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 8,692,000     8,692,000
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,692,000      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 11020 Holly Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Dayton, MN      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       2,536,731
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       10,926,042
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       13,462,773
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 13,462,773     13,462,773
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 13,462,773      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 333 Howard Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Des Plaines, IL      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       7,928,724
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       11,609,920
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       19,538,644
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 19,538,644     19,538,644
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 19,538,644      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 1951 TW Alexander Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Durham, NC      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       1,115,595
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       302,394
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,417,989
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,417,989     1,417,989
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,417,989      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 1953 TW Alexander Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Durham, NC      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       2,402,820
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       1,004,841
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,407,661
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,407,661     3,407,661
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,407,661      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 1957 TW Alexander Drive [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Durham, NC      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       1,844,943
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       1,467,665
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,312,608
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,312,608     3,312,608
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,312,608      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 120 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       1,243,100
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       6,568,523
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,811,623
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,811,623     7,811,623
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,811,623      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 130 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       1,171,160
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       5,065,871
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,237,031
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,237,031     6,237,031
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,237,031      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 4485 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       1,827,595
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       368,166
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       2,195,761
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 2,195,761     2,195,761
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,195,761      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 10720 West Sam Houston Parkway North [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       3,871,875
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       29,893,209
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       33,765,084
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 33,765,084     33,765,084
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 33,765,084      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 5430 FAA Boulevard [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Irving, TX      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       2,245,346
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       2,756,907
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,002,253
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,002,253     5,002,253
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,002,253      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 951 Valleyview Lane [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Irving, TX      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       3,899,824
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       5,255,183
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       9,155,007
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 9,155,007     9,155,007
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,155,007      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 11250 NW 122nd 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
Real Estate and Accumulated Depreciation, Initial Cost of Land       4,798,886
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       9,352,489
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       14,151,375
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 14,151,375     14,151,375
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 14,151,375      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 1050 Constitution Avenue [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       0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       1,682,445
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       1,682,445
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 1,682,445     1,682,445
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,682,445      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 1200 Intrepid Avenue [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       404,883
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       17,925,128
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       18,330,011
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 18,330,011     18,330,011
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 18,330,011      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 351 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       359,864
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       3,120,713
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       3,480,577
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 3,480,577     3,480,577
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,480,577      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 4701 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       419,107
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       12,090,516
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       12,509,623
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 12,509,623     12,509,623
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 12,509,623      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 5800 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       604,146
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       7,054,435
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       7,658,581
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 7,658,581     7,658,581
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,658,581      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 5800 Technology Boulevard [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       1,741,867
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       3,319,003
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       5,060,870
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 5,060,870     5,060,870
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,060,870      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 1910 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       4,693,504
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       23,421,674
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       28,115,178
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 28,115,178     28,115,178
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 28,115,178      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 1930 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       4,069,890
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       2,575,094
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       6,644,984
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 6,644,984     6,644,984
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 6,644,984      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Development in Progress [Member] | 2040 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       3,225,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       7,617,711
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       10,842,711
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements $ 10,842,711     10,842,711
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 10,842,711      
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       135,413,008
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       225,534,740
Real Estate and Accumulated Depreciation, Carrying Amount of Land       0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements       360,947,748
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 360,947,748     360,947,748
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0     0
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross 360,947,748      
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 [2]       403,475
Real Estate and Accumulated Depreciation, Carrying Amount of Land       5,158,133
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 $ 5,158,133     5,158,133
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,158,133      
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       17,719,400
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       2,777,765
Real Estate and Accumulated Depreciation, Carrying Amount of Land       20,497,165
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 $ 20,497,165     20,497,165
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 20,497,165      
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 [2]       684,340
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,724,075
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 $ 2,724,075     2,724,075
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1998      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,724,075      
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 [2]       75,163
Real Estate and Accumulated Depreciation, Carrying Amount of Land       283,809
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 $ 283,809     283,809
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2010      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 283,809      
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]       2,320
Real Estate and Accumulated Depreciation, Carrying Amount of Land       657,033
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 $ 657,033     657,033
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 657,033      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Land Held for Development [Member] | Shopton Ridge Business Park 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       642,756
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       359,147
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,001,903
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 $ 1,001,903     1,001,903
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,001,903      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Land Held for Development [Member] | Holly Lane North Land [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Dayton, MN      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       889,205
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       129,550
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,018,755
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 $ 1,018,755     1,018,755
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,018,755      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Land Held for Development [Member] | French Lake Land [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Dayton/Rogers, MN      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       13,513,632
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       1,253,172
Real Estate and Accumulated Depreciation, Carrying Amount of Land       14,766,804
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 $ 14,766,804     14,766,804
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 14,766,804      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Land Held for Development [Member] | 1951 TW Alexander Drive Land [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Durham, NC      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       758,503
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       235,437
Real Estate and Accumulated Depreciation, Carrying Amount of Land       993,940
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 $ 993,940     993,940
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 993,940      
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 [2]       5,166,199
Real Estate and Accumulated Depreciation, Carrying Amount of Land       7,217,830
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 $ 7,217,830     7,217,830
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,217,830      
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 [2]       4,247,448
Real Estate and Accumulated Depreciation, Carrying Amount of Land       21,105,004
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 $ 21,105,004     21,105,004
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 21,105,004      
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]       2,936,009
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,500,544
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 $ 3,500,544     3,500,544
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,500,544      
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       16,338
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       43,923
Real Estate and Accumulated Depreciation, Carrying Amount of Land       60,261
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 $ 60,261     60,261
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 60,261      
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 [2]       578,732
Real Estate and Accumulated Depreciation, Carrying Amount of Land       4,453,935
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 $ 4,453,935     4,453,935
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 4,453,935      
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 [2]       (583,888)
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,787,295
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 $ 2,787,295     2,787,295
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2008      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,787,295      
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 [2]       14,470
Real Estate and Accumulated Depreciation, Carrying Amount of Land       5,175,138
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 $ 5,175,138     5,175,138
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,175,138      
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 [2]       3,417,149
Real Estate and Accumulated Depreciation, Carrying Amount of Land       9,174,014
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 $ 9,174,014     9,174,014
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 9,174,014      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Land Held for Development [Member] | Richey 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       26,135,466
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       6,321,539
Real Estate and Accumulated Depreciation, Carrying Amount of Land       32,457,005
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 $ 32,457,005     32,457,005
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 32,457,005      
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       4,611,474
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       920,126
Real Estate and Accumulated Depreciation, Carrying Amount of Land       5,531,600
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 $ 5,531,600     5,531,600
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,531,600      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Land Held for Development [Member] | Frye Road and Valley View Lane Land [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Irving, TX      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       1,917,440
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       330,155
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,247,595
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 $ 2,247,595     2,247,595
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,247,595      
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 [2]       0
Real Estate and Accumulated Depreciation, Carrying Amount of Land       15,806,030
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 $ 15,806,030     15,806,030
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 15,806,030      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Land Held for Development [Member] | Port Crossing Commerce Center Land [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property La Porte, TX      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       22,454,978
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       589,812
Real Estate and Accumulated Depreciation, Carrying Amount of Land       23,044,790
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 $ 23,044,790     23,044,790
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 23,044,790      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
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 [2]       1,416,243
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,208,361
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 $ 2,208,361     2,208,361
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1995      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,208,361      
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       35,499,849
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       8,515,631
Real Estate and Accumulated Depreciation, Carrying Amount of Land       44,015,480
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 $ 44,015,480     44,015,480
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 44,015,480      
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 [2]       0
Real Estate and Accumulated Depreciation, Carrying Amount of Land       1,344,809
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 $ 1,344,809     1,344,809
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2012      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 1,344,809      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Land Held for Development [Member] | 6 Great Valley Parkway 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       603,050
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       2,049,126
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,652,176
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 $ 2,652,176     2,652,176
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,652,176      
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 [2]       297,332
Real Estate and Accumulated Depreciation, Carrying Amount of Land       972,831
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 $ 972,831     972,831
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2001      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 972,831      
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 [2]       10,787,022
Real Estate and Accumulated Depreciation, Carrying Amount of Land       27,526,654
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 $ 27,526,654     27,526,654
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2011      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 27,526,654      
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 [2]       1,164,543
Real Estate and Accumulated Depreciation, Carrying Amount of Land       7,249,880
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 $ 7,249,880     7,249,880
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 7,249,880      
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 [2]       486,885
Real Estate and Accumulated Depreciation, Carrying Amount of Land       5,154,531
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 $ 5,154,531     5,154,531
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,154,531      
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       427,838
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       0
Real Estate and Accumulated Depreciation, Carrying Amount of Land       434,870
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 $ 434,870     434,870
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 434,870      
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       267,468
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       222,069
Real Estate and Accumulated Depreciation, Carrying Amount of Land       489,537
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 $ 489,537     489,537
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2004      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 489,537      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Land Held for Development [Member] | Southern Boulevard Land [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Palm Beach County, FL      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       12,042,368
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       4,671,872
Real Estate and Accumulated Depreciation, Carrying Amount of Land       16,714,240
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 $ 16,714,240     16,714,240
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2014      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 16,714,240      
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 [2]       703,833
Real Estate and Accumulated Depreciation, Carrying Amount of Land       11,907,427
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 $ 11,907,427     11,907,427
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2013      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 11,907,427      
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       8,237,744
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       3,943
Real Estate and Accumulated Depreciation, Carrying Amount of Land       8,241,687
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 $ 8,241,687     8,241,687
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,241,687      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
Land Held for Development [Member] | Sherrif Road Land [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Location of Property Prince George's County, MD      
Real Estate and Accumulated Depreciation, Amount of Encumbrances       0
Real Estate and Accumulated Depreciation, Initial Cost of Land       4,893,300
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       662,231
Real Estate and Accumulated Depreciation, Carrying Amount of Land       5,555,531
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 $ 5,555,531     5,555,531
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2015      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 5,555,531      
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 [2]       21,442
Real Estate and Accumulated Depreciation, Carrying Amount of Land       169,756
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 $ 169,756     169,756
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 1996      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 169,756      
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]       2,176,777
Real Estate and Accumulated Depreciation, Carrying Amount of Land       8,353,241
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 $ 8,353,241     8,353,241
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2005      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,353,241      
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 [2]       813,499
Real Estate and Accumulated Depreciation, Carrying Amount of Land       3,529,213
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 $ 3,529,213     3,529,213
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 3,529,213      
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 [2]       30,114
Real Estate and Accumulated Depreciation, Carrying Amount of Land       210,250
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 $ 210,250     210,250
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2000      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 210,250      
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 [2]       4,950,267
Real Estate and Accumulated Depreciation, Carrying Amount of Land       8,239,690
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 $ 8,239,690     8,239,690
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2006      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 8,239,690      
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 [2]       338,629
Real Estate and Accumulated Depreciation, Carrying Amount of Land       2,334,004
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 $ 2,334,004     2,334,004
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0     0
Real Estate and Accumulated Depreciation, Date Acquired or Developed 2007      
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross $ 2,334,004      
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       251,940,264
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements       0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements [2]       69,213,501
Real Estate and Accumulated Depreciation, Carrying Amount of Land       336,966,826
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 336,966,826     336,966,826
Real Estate and Accumulated Depreciation, Accumulated Depreciation 0     $ 0
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]        
Real Estate, Gross 336,966,826      
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]        
Real Estate Accumulated Depreciation $ 0      
[1] Does not include deferred financing costs and market adjustments.
[2] Includes foreign currency changes and write-offs of certain fully depreciated assets and net of impairment charges.
[3] Denotes property is collateralized under mortgages with Allianz, LaSalle Bank, Athene, New York Life and Wells Fargo totaling $232.1 million.