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Real estate assets held for sale (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2015 USD ($) ft² | Dec. 31, 2014 USD ($)
Long Lived Assets Held-for-sale [Line Items] |  |
Document Period End Date | Sep. 30, 2015 |
Operating properties accumulated depreciation, held for sale |  |
Operating properties, net held for sale | $ 44,560,000.000 |
Notes and accounts receivable held for sale | 606,000.000 |
Deferred rents receivable held for sale | 4,239,000.000 |
Held for sale, other assets | 1,086,000.000 |
Disposal Group, Including Discontinued Operation, Long Lived Assets | 50,491,000 | $ 0
Accounts payable and accrued expenses held for sale | 2,212,000 |
Other liabilities held for sale | 631,000 |
Disposal Group, Including Discontinued Operation, Liabilities, Current | $ 2,843,000 | $ 0
Intangible assets accumulated amortization, held for sale |  |
Intangible liabilities accumulated amortization, held for sale |  |
North Point Center [Member] |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Net Rentable Area | ft² | 540,000,000 |
The Points at Waterview [Member] |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Net Rentable Area | ft² | 203,000,000 |

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Amount classified as liabilities attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721673-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51716988&loc=d3e1107-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2473-110228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=51716988&loc=SL51721533-107759 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2941-110230 + Details
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