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Summary of Significant Accounting Policies: (Details 2) | 12 Months Ended
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Dec. 31, 2012
Investment in unconsolidated joint ventures |
Threshold ownership percentage above which to use equity method of accounting only if no controlling financial interest | 50.00%
Buildings and improvements | Minimum |
Property, Plant and Equipment |
Estimated useful lives of assets | 5 years
Buildings and improvements | Maximum |
Property, Plant and Equipment |
Estimated useful lives of assets | 40 years
Tenant improvements | Minimum |
Property, Plant and Equipment |
Estimated useful lives of assets | 5 years
Tenant improvements | Maximum |
Property, Plant and Equipment |
Estimated useful lives of assets | 7 years
Equipment and furnishings | Minimum |
Property, Plant and Equipment |
Estimated useful lives of assets | 5 years
Equipment and furnishings | Maximum |
Property, Plant and Equipment |
Estimated useful lives of assets | 7 years

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- Definition Estimated economic life on which depreciation was computed, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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