COMPONENTS OF RENTAL INCOME AND EXPENSE - Component of Rental Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Rental Income [Line Items]
Cost reimbursement	$ 8,049	$ 7,405	$ 22,654	$ 21,115
Percentage rent	552	732	1,277	1,548
Hotel revenue	10,796	10,122	28,531	26,167
Other	354	444	1,137	1,275
Total rental income	67,471	63,593	193,776	182,868
Total Retail
Rental Income [Line Items]
Minimum rents	18,274	17,841	54,741	52,581
Total Office
Rental Income [Line Items]
Minimum rents	22,193	20,534	64,913	60,970
Total Multifamily
Rental Income [Line Items]
Minimum rents	4,650	3,992	12,820	11,723
Total Mixed-Use
Rental Income [Line Items]
Minimum rents	$ 2,603	$ 2,523	$ 7,703	$ 7,489