SEGMENT DISCLOSURE - Operating Income (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) property	Sep. 30, 2016 USD ($)
Segment Reporting [Abstract]
Number of types of commercial real estate properties | property			3
Segment disclosure
Revenues	$ 55,384	$ 64,332	$ 183,632	$ 201,309
Expenses:
Interest expense	9,359	10,276	28,645	24,386
General and administrative	1,342	2,226	4,668	6,299
EXPENSES	57,369	70,498	203,473	206,070
Total segment net operating income	72,730	8,761	358,891	34,905
Reportable segments
Expenses:
Total segment net operating income	27,899	30,279	102,483	99,892
Reportable segments | Office
Segment disclosure
Revenues	41,427	47,584	134,434	139,403
Expenses:
Operating	18,761	22,351	50,318	60,768
General and administrative	106	344	788	789
EXPENSES	18,867	22,695	51,106	61,557
Total segment net operating income	22,560	24,889	83,328	77,846
Reportable segments | Hotel
Segment disclosure
Revenues	8,406	9,139	29,528	38,918
Expenses:
Operating	5,943	6,479	18,968	25,865
General and administrative	30	229	69	622
EXPENSES	5,973	6,708	19,037	26,487
Total segment net operating income	2,433	2,431	10,491	12,431
Reportable segments | Multi-family
Segment disclosure
Revenues	2,683	5,068	12,400	15,298
Expenses:
Operating	1,354	2,893	6,981	8,667
General and administrative	36	485	378	840
EXPENSES	1,390	3,378	7,359	9,507
Total segment net operating income	1,293	1,690	5,041	5,791
Reportable segments | Lending
Segment disclosure
Revenues	2,868	2,541	7,270	7,690
Expenses:
Interest expense	116	124	203	306
Fees to related party	845	865	2,473	2,679
General and administrative	294	283	971	881
EXPENSES	1,255	1,272	3,647	3,866
Total segment net operating income	$ 1,613	$ 1,269	$ 3,623	$ 3,824