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NOTES RECEIVABLE Schedule of Notes Receivable (Details) (USD $) | 9 Months Ended |  | 1 Months Ended |  |  | 1 Months Ended |  |  |  |  |  |  |  |  | 1 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |  |  |  |  | 9 Months Ended |  |
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Sep. 30, 2013 loan | Sep. 30, 2012 | Dec. 31, 2012 | Jan. 31, 2013 Fund III | Feb. 28, 2013 Brooklyn, New York Fund III | Dec. 31, 2012 Brooklyn, New York Fund III | Apr. 30, 2012 Brooklyn, New York Fund III | Mar. 31, 2013 Construction Loans | Sep. 30, 2013 First Mortgage Loan, 9% Loan Due 2013 | Dec. 31, 2012 First Mortgage Loan, 9% Loan Due 2013 | Sep. 30, 2013 First Mortgage Loan, 6% Loan Due 2013 | Dec. 31, 2012 First Mortgage Loan, 6% Loan Due 2013 | Sep. 30, 2013 First Mortgage Loan, 8% Loan Due 2013 | Dec. 31, 2012 First Mortgage Loan, 8% Loan Due 2013 | Sep. 30, 2013 Mezzanine Loan, 10% Due 2013 loan borrower | Dec. 31, 2012 Mezzanine Loan, 10% Due 2013 | Jan. 31, 2013 First Mortgage Loan, 11% Loan Due 2014 | Sep. 30, 2013 First Mortgage Loan, 11% Loan Due 2014 | Dec. 31, 2012 First Mortgage Loan, 11% Loan Due 2014 | Sep. 30, 2013 Zero Coupon Loan | Dec. 31, 2012 Zero Coupon Loan | Sep. 30, 2013 Mezzanine Loan, 15% Due 2020 | Dec. 31, 2012 Mezzanine Loan, 15% Due 2020 | Sep. 30, 2013 Mezzanine Loan Due With Capital Event | Dec. 31, 2012 Mezzanine Loan Due With Capital Event | Sep. 30, 2013 First Mortgage Loan, 5.3% Due On Demand | Dec. 31, 2012 First Mortgage Loan, 5.3% Due On Demand | Sep. 30, 2013 Construction Loan, 20.5% Due 2012 | Dec. 31, 2012 Construction Loan, 20.5% Due 2012 | Sep. 30, 2013 Individually Less Than 3 Percent, Variable Interest Rate Due 2013 to Capital Event loan | Dec. 31, 2012 Individually Less Than 3 Percent, Variable Interest Rate Due 2013 to Capital Event | Sep. 30, 2013 Individually Less Than 3 Percent, Variable Interest Rate Due 2013 to Capital Event Minimum | Sep. 30, 2013 Individually Less Than 3 Percent, Variable Interest Rate Due 2013 to Capital Event Maximum
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans On Real Estate, Net Carrying Amount | $ 95,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate, Number of Cross Collateralized Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate, Number of Borrowers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate, Number of Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Mortgage Loans on Real Estate, Number of Non-Performing Loans | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Mortgage Loans on Real Estate, Face Amount of Mortgages |  |  |  |  |  |  | 23,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,700,000 |  |  |  |  |
Mortgage Loans on Real Estate, Face Amount of Mortgages, Reserved |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,900,000 |  |  |  |  |
Effective interest rate |  |  |  |  |  |  |  |  | 12.00% | [1] |  | 6.00% | [1] |  | 8.00% | [1] |  | 10.00% | [1],[2] |  |  |  | 11.00% | [1] |  | 24.00% | [1],[3] |  |  | 15.00% | [1] |  | 15.00% | [1],[4] |  |  | 5.30% | [1] |  | 20.50% | [1] |  |  |  | 11.00% | [1] | 17.50% | [1]
Prior liens |  |  |  |  |  |  |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 89,566,000 | [2] |  |  |  | 0 |  |  | 166,200,000 | [3] |  |  | 0 |  |  | 16,668,000 | [4] |  |  | 0 |  |  | 0 |  |  | 37,623,000 |  |  |  |  |
Carrying amount of mortgages | 95,352,000 |  | 129,278,000 |  |  | 18,500,000 |  |  | 12,204,000 |  | 12,333,000 | 0 |  | 10,250,000 | 8,000,000 |  | 8,000,000 | 9,089,000 | [2] | 9,089,000 | [2] |  | 25,000,000 |  | 25,000,000 | 4,314,000 | [3] | 3,961,000 | [3] | 30,879,000 |  | 30,879,000 | 3,834,000 | [4] | 3,834,000 | [4] | 0 |  | 18,500,000 | 0 |  | 5,400,000 | 2,032,000 | 2,032,000 |  |  |  |
Proceeds from notes receivable | 15,779,000 | 2,005,000 |  | 2,500,000 | 13,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate, Collections of Principal |  |  |  |  |  |  |  | 5,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate, Nonperforming Loans, Amount | 18,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of extension options, second period (in months) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable, net | 95,352,000 |  | 129,278,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses | $ 3,919,000 |  | $ 3,681,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | The effective interest rate includes origination and exit fees.
[2] | Comprised of three cross-collateralized loans from one borrower, which are non-performing
[3] | The principal balance for this accrual only loan is increased by the interest accrued
[4] | Non-performing loan

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- Definition Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5066-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of prior lien on the real estate that secures the mortgage loan. + 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 IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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