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ORGANIZATION AND BASIS OF PRESENTATION Summary of General Terms and Operating Partnership's Equity Interests (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Jun. 30, 2013
Fund I and Mervyns I |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Operating Partnership Share of Capital | 22.22% | [1]
Committed Capital | $ 90.0 | [1],[2]
Capital Called as of March 31, 2013 | 86.6 | [1],[2]
Ownership Interest By General Partner or Managing Partner | 37.78% | [1]
Preferred Return | 9.00% | [1]
Capital Returned as of March 31, 2013 | 86.6 | [1],[2]
Fund II and Mervyns II |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Operating Partnership Share of Capital | 20.00% |
Committed Capital | 300.0 | [2]
Capital Called as of March 31, 2013 | 300.0 | [2]
Ownership Interest By General Partner or Managing Partner | 20.00% |
Preferred Return | 8.00% |
Capital Returned as of March 31, 2013 | 84.5 | [2]
Fund III |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Operating Partnership Share of Capital | 19.90% |
Committed Capital | 475.0 | [2]
Capital Called as of March 31, 2013 | 351.4 | [2]
Ownership Interest By General Partner or Managing Partner | 19.90% |
Preferred Return | 6.00% |
Capital Returned as of March 31, 2013 | 182.6 | [2]
Fund IV |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Operating Partnership Share of Capital | 23.12% |
Committed Capital | 540.6 | [2]
Capital Called as of March 31, 2013 | 74.0 | [2]
Ownership Interest By General Partner or Managing Partner | 23.12% |
Preferred Return | 6.00% |
Capital Returned as of March 31, 2013 | $ 0 | [2]
[1] | Fund I and Mervyns I have returned all capital and preferred return. The Operating Partnership is now entitled to a Promote on all future cash distributions.
[2] | Represents the total for the Opportunity Funds, including the Operating Partnership and noncontrolling interests' shares.

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