SEGMENT DISCLOSURE - Operating Income (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) property	Mar. 31, 2016 USD ($)
Segment Reporting [Abstract]
Number of types of commercial real estate properties | property	3
Segment disclosure
Revenues	$ 66,949	$ 68,617
Expenses:
Interest expense	9,773	6,815
General and administrative	1,679	1,942
EXPENSES	60,356	66,873
INCOME FROM CONTINUING OPERATIONS BEFORE PROVISION FOR INCOME TAXES	194,327	26,483
Reportable segments
Expenses:
INCOME FROM CONTINUING OPERATIONS BEFORE PROVISION FOR INCOME TAXES	42,115	35,342
Reportable segments | Office
Segment disclosure
Revenues	49,093	46,049
Expenses:
Operating	13,753	18,487
General and administrative	288	354
EXPENSES	14,041	18,841
INCOME FROM CONTINUING OPERATIONS BEFORE PROVISION FOR INCOME TAXES	35,052	27,208
Reportable segments | Hotel
Segment disclosure
Revenues	10,518	15,283
Expenses:
Operating	6,439	9,955
General and administrative	4	87
EXPENSES	6,443	10,042
INCOME FROM CONTINUING OPERATIONS BEFORE PROVISION FOR INCOME TAXES	4,075	5,241
Reportable segments | Multi-family
Segment disclosure
Revenues	5,003	5,058
Expenses:
Operating	2,768	2,836
General and administrative	229	258
EXPENSES	2,997	3,094
INCOME FROM CONTINUING OPERATIONS BEFORE PROVISION FOR INCOME TAXES	2,006	1,964
Reportable segments | Lending
Segment disclosure
Revenues	2,335	2,227
Expenses:
Interest expense	142	189
Fees to related party	844	930
General and administrative	367	179
EXPENSES	1,353	1,298
INCOME FROM CONTINUING OPERATIONS BEFORE PROVISION FOR INCOME TAXES	$ 982	$ 929