SEGMENT DISCLOSURE - Operating Income (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) property	Sep. 30, 2018 USD ($) property	Sep. 30, 2019 USD ($) property	Sep. 30, 2018 USD ($) property
Segment disclosure
Number of types of commercial real estate properties | property	2	2	2	2
Pro forma revenue	$ 29,215	$ 47,607	$ 113,348	$ 147,445
Expenses:
Interest expense	2,403	6,965	8,998	20,409
General and administrative	1,384	1,205	4,793	6,496
EXPENSES	26,574	48,021	198,720	144,608
Segment net operating income	2,943	(414)	347,732	2,837
Reportable segments
Expenses:
Segment net operating income	12,927	25,332	55,754	82,909
Reportable segments | Office
Segment disclosure
Pro forma revenue	16,885	36,440	72,380	109,141
Expenses:
Operating	7,205	14,459	29,677	39,770
General and administrative	41	83	397	1,062
EXPENSES	7,246	14,542	30,074	40,832
Segment net operating income	9,639	21,898	42,306	68,309
Reportable segments | Hotel
Segment disclosure
Pro forma revenue	8,511	8,542	29,430	29,980
Expenses:
Operating	6,081	5,946	19,520	19,316
General and administrative	31	0	108	18
EXPENSES	6,112	5,946	19,628	19,334
Segment net operating income	2,399	2,596	9,802	10,646
Reportable segments | Lending
Segment disclosure
Pro forma revenue	2,411	2,625	8,312	8,324
Expenses:
Interest expense	365	633	1,483	1,117
Fees to related party	652	740	1,840	1,980
General and administrative	505	414	1,343	1,273
EXPENSES	1,522	1,787	4,666	4,370
Segment net operating income	$ 889	$ 838	$ 3,646	$ 3,954