SEGMENT REPORTING Operating Activity Within Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
OPERATING INCOME	$ 23,036	$ 21,441	$ 61,143	$ 60,694
Total Segments' profit	44,070	42,120	125,974	123,966
Total Retail
Segment Reporting Information [Line Items]
Property revenue	24,177	23,524	70,746	69,175
Property expense	(6,197)	(6,445)	(18,703)	(17,476)
OPERATING INCOME	17,980	17,079	52,043	51,699
Total Office
Segment Reporting Information [Line Items]
Property revenue	23,416	22,664	68,721	67,598
Property expense	(6,813)	(6,636)	(19,791)	(19,656)
OPERATING INCOME	16,603	16,028	48,930	47,942
Total Multifamily
Segment Reporting Information [Line Items]
Property revenue	4,320	4,155	12,660	12,004
Property expense	(1,532)	(1,525)	(4,513)	(4,383)
OPERATING INCOME	2,788	2,630	8,147	7,621
Total Mixed-Use
Segment Reporting Information [Line Items]
Property revenue	15,430	14,975	41,395	41,635
Property expense	(8,731)	(8,592)	(24,541)	(24,931)
OPERATING INCOME	$ 6,699	$ 6,383	$ 16,854	$ 16,704