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Segments (Reconciliation to Net Income Loss) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]    
Revenues $ 17,668,967 $ 14,077,105
Rental operating costs 5,554,937 4,944,010
Asset Impairment Charges 1,676,531 429,000
Operating Income (Loss) 11,788,463 8,801,543
Interest Income, Other 7,994 28,214
Gain on sale of real estate 898,220 119,925
Gain on dissolution of partnership interests 372,089 0
General and administrative 4,752,459 3,846,177
Interest expense 4,493,558 3,194,887
Depreciation and amortization 4,869,467 4,170,626
Real Estate Owned, Valuation Allowance, Provision 1,278,531 0
Net income (loss) from continuing operations (1,635,762) (2,262,008)
Income (loss) attributable to noncontrolling interests 497,712 354,895
Net loss (2,133,474) (2,616,903)
Industrial Office Properties [Member]
    
Segment Reporting Information [Line Items]    
Revenues 8,994,345 6,790,869
Rental operating costs 2,979,251 2,660,482
Operating Income (Loss) 6,015,094 4,130,387
Residential Properties [Member]
    
Segment Reporting Information [Line Items]    
Revenues 2,921,813 2,982,300
Rental operating costs 354,655 317,924
Asset Impairment Charges 98,000 30,000
Operating Income (Loss) 2,469,158 2,235,376
Retail Properties [Member]
    
Segment Reporting Information [Line Items]    
Revenues 2,862,846 2,001,405
Rental operating costs 767,677 587,938
Asset Impairment Charges 300,000 0
Operating Income (Loss) 1,795,169 1,413,467
Self Storage Properties [Member]
    
Segment Reporting Information [Line Items]    
Revenues 2,889,963 2,302,531
Rental operating costs 1,453,354 1,377,666
Operating Income (Loss) 1,436,609 924,865
Reportable Segment [Member]
    
Segment Reporting Information [Line Items]    
Interest Income Mortgage Loans 72,433 97,448
Unallocated Amount to Segment [Member]
    
Segment Reporting Information [Line Items]    
Asset Impairment Charges $ 1,300,000