Mortgage Notes Payable Table 2 - Schedule of Debt Premium / Discount (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Summary of Assumed Debt Premium / Discount [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	$ 1,779	$ (1,750)
Dignity Health Office Portfolio [Member]
Summary of Assumed Debt Premium / Discount [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	(263)
Debt Instrument, Interest Rate, Effective Percentage	5.41%
Stirling Slidell Shopping Centre [Member]
Summary of Assumed Debt Premium / Discount [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	44
Debt Instrument, Interest Rate, Effective Percentage	5.57%
4 Research Park Drive [Member]
Summary of Assumed Debt Premium / Discount [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	5
Debt Instrument, Interest Rate, Effective Percentage	6.17%
The District at Howell Mill [Member]
Summary of Assumed Debt Premium / Discount [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	2,755
Debt Instrument, Interest Rate, Effective Percentage	6.34%
Canyon Plaza [Member]
Summary of Assumed Debt Premium / Discount [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	114
Debt Instrument, Interest Rate, Effective Percentage	6.10%
Campus Lodge Tampa [Member]
Summary of Assumed Debt Premium / Discount [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	(691)
Debt Instrument, Interest Rate, Effective Percentage	5.95%
111 Sutter Street [Member]
Summary of Assumed Debt Premium / Discount [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	$ (3,743)
Debt Instrument, Interest Rate, Effective Percentage	2.66%