NOTES PAYABLE (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Interest expense	$ 19,876,000	$ 14,663,000	$ 8,814,000
Amortization of deferred financing costs	1,800,000	1,700,000	1,600,000
Interest capitalized	0	3,920,000	4,075,000
Interest payable	800,000	1,400,000
210 West 31st Street
Debt Instrument [Line Items]
Interest capitalized	0	3,900,000	4,100,000
Interest Rate Cap
Debt Instrument [Line Items]
Losses on derivative instruments	$ 63,000	$ 23,000	$ 100,000