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Segments, Net Operating Income by Segment (Details) (USD $) | 3 Months Ended
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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

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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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