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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES - Additional Information (Details)		1 Months Ended	3 Months Ended			12 Months Ended
		Apr. 30, 2012	Mar. 31, 2019 USD ($) property	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Mar. 22, 2013
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	[1]		$ 93,841,000			$ 40,354,000
Distributions from operations of investment in unconsolidated joint ventures			3,067,000	$ 0
Expenses from investment			(3,863,000)	(3,572,000)
Grace Lake JV, LLC
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures			$ 2,664,000			5,316,000
Percentage of equity kicker received with right to convert upon capital event		25.00%
Preferred return used to determine distribution of excess cash flow (as a percent)			8.25%
Percentage of distribution of all excess cash flows and all disposition proceeds upon any sale entitled after consideration of preferred return and return of equity remaining in the property to operating partner			25.00%
Percentage of investment of operating partner			81.00%
Distributions from operations of investment in unconsolidated joint ventures			$ 3,100,000	$ 1,300,000
Grace Lake JV, LLC | LP Units
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)							19.00%
Grace Lake JV, LLC | Limited liability company
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)			19.00%
24 Second Avenue Holdings LLC
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures			$ 91,177,000			35,038,000
Expenses from investment			500,000			(200,000)
Interest costs capitalized			100,000		$ 300,000
24 Second Avenue Holdings LLC | Mezzanine Loan
Schedule of Equity Method Investments [Line Items]
Committed amount on credit agreement			6,500,000
24 Second Avenue Holdings LLC | Co-venturer
Schedule of Equity Method Investments [Line Items]
Loans payable outstanding from unconsolidated joint venture						$ 46,700,000
24 Second Avenue Holdings LLC | Co-venturer | Construction Loan
Schedule of Equity Method Investments [Line Items]
Common equity interest			35,000,000
Preferred equity position			35,000,000
Loan refinance			50,400,000
Committed amount on credit agreement			48,059,266
Remaining capital commitment to operating partner			$ 0
Apartment Building | 24 Second Avenue Holdings LLC
Schedule of Equity Method Investments [Line Items]
Number of real estate properties | property			30
Number of real estate properties, under contract | property			15
Real estate properties, under contract			$ 43,300,000
Other | 24 Second Avenue Holdings LLC
Schedule of Equity Method Investments [Line Items]
Number of real estate properties | property			1
Real Estate Property Sold | Apartment Building | 24 Second Avenue Holdings LLC
Schedule of Equity Method Investments [Line Items]
Number of real estate properties, under contract | property			1
Real estate properties, under contract			$ 1,000,000
Real Estate Property Sold Two | Apartment Building | 24 Second Avenue Holdings LLC
Schedule of Equity Method Investments [Line Items]
Number of real estate properties, under contract | property			3
Real estate properties, under contract			$ 6,200,000
Minimum | Apartment Building | 24 Second Avenue Holdings LLC
Schedule of Equity Method Investments [Line Items]
Real estate properties, under contract, deposit (as a percentage)			10.00%
Maximum | Apartment Building | 24 Second Avenue Holdings LLC
Schedule of Equity Method Investments [Line Items]
Real estate properties, under contract, deposit (as a percentage)			15.00%
[1] Includes amounts relating to consolidated variable interest entities. See Note 3.

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