INVESTMENT IN UNCONSOLIDATED VENTURES - Balance Sheet Information (Details) $ in Thousands	Dec. 31, 2020 USD ($) property	Dec. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of properties | property	8
ASSETS
Real estate investment property, net	$ 160,192	$ 169,689
Cash and cash equivalents	19,885	22,699
Other assets	7,390	7,282
Total Assets	365,741	390,610
Liabilities:
Mortgages payable	130,434	133,215
Accounts payable and accrued liabilities	20,536	20,772
Total Liabilities	188,053	191,050
Commitments and contingencies
Equity [Abstract]
Total unconsolidated joint venture equity	177,772	199,653
Total Liabilities and Equity	365,741	390,610
Investment in unconsolidated joint ventures	169,474	177,071
Real estate properties, net of accumulated depreciation	30,837	24,094
Deferred mortgage costs	880	1,160
Mortgages
Equity [Abstract]
Deferred mortgage costs	$ 563	823
Unconsolidated joint ventures
Schedule of Equity Method Investments [Line Items]
Number of properties | property	31
ASSETS
Real estate investment property, net	$ 1,075,178	1,070,941
Cash and cash equivalents	16,939	12,804
Other assets	29,392	28,048
Total Assets	1,121,509	1,111,793
Liabilities:
Mortgages payable	829,646	803,289
Accounts payable and accrued liabilities	20,237	19,731
Total Liabilities	849,883	823,020
Equity [Abstract]
Total unconsolidated joint venture equity	271,626	288,773
Total Liabilities and Equity	1,121,509	1,111,793
Investment in unconsolidated joint ventures	169,474	177,071
Real estate properties, net of accumulated depreciation	145,600	104,001
Unconsolidated joint ventures | Mortgages
Equity [Abstract]
Deferred mortgage costs	$ 5,537	$ 5,839