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Segments, Net Operating Income by Segment (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Segment
Dec. 31, 2012
Segments [Abstract]    
Number of reportable segments 4  
Net Operating Income [Abstract]    
Rental income $ 19,563,122 $ 17,668,967
Property and related expenses 6,382,425 5,554,937
Asset impairment 2,000,000 1,676,531
Industrial Office Properties [Member]
   
Net Operating Income [Abstract]    
Rental income 10,448,256 8,994,345
Property and related expenses 3,629,413 2,979,251
Asset impairment 2,000,000 0
Net operating income, as defined 4,818,843 6,015,094
Residential Properties [Member]
   
Net Operating Income [Abstract]    
Rental income 2,995,612 2,921,813
Property and related expenses 195,752 354,655
Asset impairment 0 98,000
Net operating income, as defined 2,799,860 2,469,158
Retail Properties [Member]
   
Net Operating Income [Abstract]    
Rental income 2,878,145 2,862,846
Property and related expenses 861,327 767,677
Asset impairment 0 300,000
Net operating income, as defined 2,016,818 1,795,169
Self Storage Properties [Member]
   
Net Operating Income [Abstract]    
Rental income 3,241,109 2,889,963
Property and related expenses 1,695,933 1,453,354
Net operating income, as defined $ 1,545,176 $ 1,436,609