Segment Reporting Net Real Estate and Secured Note Payable Balances for Each Segment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Net Real Estate	$ 1,676,836		$ 1,668,182
Secured Notes Payable	962,259	[1]	1,057,680	[1]
Capital Expenditures and Leasing Commissions	58,707	[2]	38,038	[2]
Unamortized fair value adjustment	10,085		12,998
Total Retail
Segment Reporting Information [Line Items]
Net Real Estate	651,707		669,177
Secured Notes Payable	303,249	[1]	397,732	[1]
Capital Expenditures and Leasing Commissions	4,849	[2]	14,211	[2]
Total Office
Segment Reporting Information [Line Items]
Net Real Estate	790,153		759,203
Secured Notes Payable	427,256	[1]	428,194	[1]
Capital Expenditures and Leasing Commissions	27,275	[2]	22,136	[2]
Total Multifamily
Segment Reporting Information [Line Items]
Net Real Estate	35,349		36,391
Secured Notes Payable	101,444	[1]	101,444	[1]
Capital Expenditures and Leasing Commissions	24,641	[2]	964	[2]
Total Mixed-Use
Segment Reporting Information [Line Items]
Net Real Estate	199,627		203,411
Secured Notes Payable	130,310	[1]	130,310	[1]
Capital Expenditures and Leasing Commissions	$ 1,942	[2]	$ 727	[2]

[1] Excludes unamortized fair market value adjustment of $10.1 million and $13.0 million as of December 31, 2013 and 2012, respectively.

[2] Capital expenditures represent cash paid for capital expenditures during the year and include leasing commissions paid.