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Segments, Net Operating Income by Segment (Details) (USD $)
3 Months Ended
Mar. 31, 2014
Segment
Mar. 31, 2013
Segments [Abstract]    
Number of reportable segments 4  
Net Operating Income [Abstract]    
Rental income $ 4,779,840 $ 5,168,596
Property and related expenses 1,667,319 1,561,936
Industrial Office Properties [Member]
   
Net Operating Income [Abstract]    
Rental income 2,607,241 2,575,649
Property and related expenses 1,039,090 915,793
Total net operating income, as defined, for reportable segments 1,568,151 1,659,856
Residential Properties [Member]
   
Net Operating Income [Abstract]    
Rental income 671,186 874,318
Property and related expenses 6,735 76,779
Total net operating income, as defined, for reportable segments 664,451 797,539
Retail Properties [Member]
   
Net Operating Income [Abstract]    
Rental income 640,826 995,874
Property and related expenses 214,732 184,295
Total net operating income, as defined, for reportable segments 426,094 811,579
Self Storage Properties [Member]
   
Net Operating Income [Abstract]    
Rental income 860,587 722,755
Property and related expenses 406,762 385,069
Total net operating income, as defined, for reportable segments $ 453,825 $ 337,686