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Segments (Net Operating Income by Segment) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Net Operating Income [Abstract]        
Rental income $ 5,591,892 $ 3,842,780 $ 10,964,092 $ 7,762,031
Property and related expenses (1,910,903) (1,355,292) (3,840,094) (2,615,850)
Gain (Loss) on the sale of real estate 4,730,398 (156,651) 4,730,398 (156,651)
General and administrative expenses (1,139,112) (1,563,793) (2,293,914) (2,688,649)
Depreciation and amortization (1,814,786) (1,260,522) (3,676,332) (2,439,010)
Interest expense - mortgage notes (1,458,860) (1,149,972) (2,891,023) (2,199,055)
Interest and other income 21,153 41,790 35,757 60,159
Gain on sales of real estate and partnerships, net 1,116,258 936,030 1,194,754 1,663,807
Net income (loss) 4,157,199 (591,622) 2,327,672 (473,528)
Significant Reconciling Items [Member]        
Net Operating Income [Abstract]        
Net operating income, as defined 8,249,708 2,404,840 11,723,021 5,129,221
General and administrative expenses (1,139,112) (1,563,793) (2,293,914) (2,688,649)
Depreciation and amortization (1,814,786) (1,260,522) (3,676,332) (2,439,010)
Interest expense - mortgage notes (2,276,022) (1,149,972) (4,655,614) (2,199,055)
Interest and other income 21,153 41,790 35,757 60,159
Gain on sales of real estate and partnerships, net 1,116,258 936,034 1,194,754 1,663,806
Net income (loss) 4,157,199 (591,623) 2,327,672 (473,528)
Industrial Office Properties [Member] | Significant Reconciling Items [Member]        
Net Operating Income [Abstract]        
Rental income 4,085,110 2,639,041 8,175,946 5,246,281
Property and related expenses (1,564,983) (1,102,117) (3,135,551) (2,141,203)
Net operating income, as defined 2,520,127 1,536,924 5,040,395 3,105,078
Residential Properties [Member] | Significant Reconciling Items [Member]        
Net Operating Income [Abstract]        
Rental income 345,427 572,876 817,010 1,244,062
Property and related expenses (23,609) (38,108) (34,847) (44,843)
Net operating income, as defined 321,818 534,768 782,163 1,199,219
Retail Properties [Member] | Significant Reconciling Items [Member]        
Net Operating Income [Abstract]        
Rental income 955,259 630,863 1,971,136 1,271,689
Property and related expenses (322,311) (215,072) (669,696) (429,804)
Net operating income, as defined 632,948 415,791 1,301,440 841,885
Self Storage Properties [Member] | Significant Reconciling Items [Member]        
Net Operating Income [Abstract]        
Rental income 159,289 849,091 1,052,266 1,709,678
Property and related expenses (114,872) (775,083) (1,183,641) (1,569,988)
Gain (Loss) on the sale of real estate 4,730,398 (156,651) 4,730,398 (156,651)
Net operating income, as defined $ 4,774,815 $ (82,643) $ 4,599,023 $ (16,961)