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Segments, Net Operating Income by Segment (Details) (USD $) | 12 Months Ended
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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

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- Definition The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 45, 46, 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Costs incurred and are directly related to generating revenues from leased and rented property or equipment. + 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 210.5-03.2(c)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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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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