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Segments (Reconciliation to Net Income Loss) (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 4,789,367 | $ 4,601,741 | $ 14,815,232 | $ 12,963,072
Rental operating costs | 1,691,280 | 1,502,140 | 4,841,809 | 4,167,180
OwnedPropertyManagementCosts | 83,811 | 0 | 226,951 | 0
Asset Impairment Charges | 1,500,000 | 358,000 | 1,500,000 |
Interest Income Mortgage Loans | 14,901 | 21,010 | 44,215 | 57,533
Interest Income, Other | 1,708 | 286,508 | 64,089 | 290,474
Gain on sale of real estate | 169,460 | 81,695 | 1,026,371 | 180,770
Gain on dissolution of partnership interests | 0 | 285,247 | 0 | 285,247
General and administrative | 1,166,374 | 980,508 | 3,606,963 | 3,176,778
Interest expense | 1,247,604 | 1,167,736 | 3,800,959 | 3,220,906
Depreciation and amortization | 1,353,612 | 1,219,925 | 3,994,350 | 3,610,813
Income (loss) attributable to noncontrolling interests | 236,653 | 139,068 | 875,264 | 339,422
Net (loss) income | (2,220,087) | (376,418) | (2,669,438) | (1,381,250)
Industrial Office Properties [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,638,194 | 2,350,032 | 7,848,551 | 6,499,299
Rental operating costs | 880,108 | 806,940 | 2,537,538 | 2,204,997
Operating Income (Loss) | 1,758,086 | 1,543,092 | 5,311,013 | 4,294,302
Residential Properties [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 696,922 | 731,188 | 2,327,340 | 2,113,044
Rental operating costs | 25,722 | 75,185 | 178,556 | 259,426
Operating Income (Loss) | 671,200 | 656,003 | 2,148,784 | 1,853,618
Retail Properties [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 614,979 | 789,580 | 2,255,351 | 2,161,924
Rental operating costs | 234,942 | 260,294 | 622,246 | 620,263
Operating Income (Loss) | 380,037 | 529,286 | 1,633,105 | 1,541,661
Self Storage Properties [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 839,272 | 730,947 | 2,383,990 | 2,188,805
Rental operating costs | 466,697 | 359,722 | 1,276,518 | 1,082,494
Operating Income (Loss) | 372,575 | 371,225 | 1,107,472 | 1,106,311
Reportable Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | $ 3,112,988 | $ 3,120,616 | $ 10,017,638 | $ 8,853,425

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