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MORTGAGES AND OTHER NOTES PAYABLE Mortgage Loan Activity (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2015 | Jun. 30, 2015 | May. 31, 2015 | Jan. 31, 2015 | Dec. 31, 2015 | Nov. 30, 2015 | Mar. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | $ 131,568,000 |  |
Mortgages [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings, amount |  |  |  |  |  | 177,485,000 |  |
Mortgages [Member] | 1035 Third Avenue [Member] | 2.35% Mortgage Note [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings, amount |  |  |  |  | $ 42,000,000 |  |  |
Mortgages [Member] | 1035 Third Avenue [Member] | 2.35% Mortgage Note [Member] | LIBOR [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 2.35% |  |  |
Mortgages [Member] | Lincoln Park Centre [Member] | 1.45% Mortgage Note [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings, amount |  |  |  |  | $ 0 |  |  |
Repayments of debt |  |  |  |  |  | 28,000,000 |  |
Mortgages [Member] | Lincoln Park Centre [Member] | 1.45% Mortgage Note [Member] | LIBOR [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings, interest rate basis spread |  |  |  |  | 1.45% |  |  |
Mortgages [Member] | 163 Highland Avenue [Member] | 4.66% Mortgage Note [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings, amount |  |  |  |  |  |  |  | $ 9,765,000
Borrowings, interest rate |  |  |  |  |  |  |  | 4.66%
Repayments of debt |  |  |  |  |  | 0 |  |
Mortgages [Member] | Broughton Street Portfolio [Member] | 3.00% Mortgage Note [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings, amount | [1] |  |  | $ 20,000,000 |  |  |  |
Mortgages [Member] | Broughton Street Portfolio [Member] | 3.00% Mortgage Note [Member] | LIBOR [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings, interest rate basis spread | [2] |  |  | 3.00% |  |  |  |
Mortgages [Member] | City Point [Member] | 1.25% Mortgage Note [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings, amount |  |  | $ 19,000,000 |  |  |  |  |
Borrowings, interest rate |  |  | 1.25% |  |  |  |  |
Mortgages [Member] | City Point [Member] | 1.60% Mortgage Note [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings, amount |  |  | $ 62,000,000 |  |  |  |  |
Mortgages [Member] | City Point [Member] | 1.60% Mortgage Note [Member] | Securities Industry and Financial Markets Association [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings, interest rate basis spread |  |  | 1.60% |  |  |  |  |
Mortgages [Member] | City Point [Member] | 4.00% Mortgage Note [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | 20,650,000 |  |
Mortgages [Member] | City Point [Member] | 4.00% Mortgage Note [Member] | LIBOR [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings, interest rate basis spread |  |  | 4.00% |  |  |  |  |
Mortgages [Member] | 17 E. 71st Street [Member] | 1.90% Mortgage Note [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings, amount |  |  | $ 19,000,000 |  |  |  |  |
Mortgages [Member] | 17 E. 71st Street [Member] | 1.90% Mortgage Note [Member] | LIBOR [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings, interest rate basis spread |  |  | 1.90% |  |  |  |  |
Mortgages [Member] | Crescent Plaza [Member] | 4.98% Mortgage Note [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 4.98% |  |  |  |  |
Repayments of debt |  |  |  |  |  | 16,326,000 |  |
Mortgages [Member] | Pacesetter Park Shopping Center [Member] | 5.13% Mortgage Note [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 5.13% |  |  |  |  |
Repayments of debt |  |  |  |  |  | 11,152,000 |  |
Mortgages [Member] | Elmwood Park Shopping Center [Member] | 5.53% Mortgage Note [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 5.53% |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | 31,723,000 |  |
Mortgages [Member] | 210 Bowery [Member] | 2.75% Mortgage Note [Member] | LIBOR [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings, interest rate basis spread |  | 2.75% |  |  |  |  |  |
Mortgages [Member] | 210 Bowery [Member] | 1.95% Mortgage Not [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings, amount |  | $ 4,600,000 |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | 4,600,000 |  |
Mortgages [Member] | 210 Bowery [Member] | 1.95% Mortgage Not [Member] | LIBOR [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings, interest rate basis spread |  | 1.95% |  |  |  |  |  |
Mortgages [Member] | 2207 Fillmore Street [Member] | 4.50% Mortgage Note [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings, amount |  |  |  |  |  |  | $ 1,120,000 |
Borrowings, interest rate |  |  |  |  |  |  | 4.50% |
Mortgages [Member] | The Gateway Shopping Center [Member] | 5.44% Mortgage Note [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  | 5.44% |
Repayments of debt |  |  |  |  |  | $ 19,117,000 |  |
[1] | This loan is collateralized by properties in an unconsolidated joint venture. Fund IV has fully indemnified the unaffiliated joint venture partner and as such, this loan is included as consolidated debt.
[2] | Loan was repaid subsequent to December 31, 2015.

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