Debt (Details Textual) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Apr. 01, 2019	Sep. 10, 2012	Sep. 07, 2012	Mar. 29, 2012	Jan. 10, 2012	Mar. 07, 2011	Jan. 19, 2011
Debt (Textual) [Abstract]
Number of year amortization schedule		30 years
Maximum leverage ratio of revolving credit facility							60.00%
Maximum secured leverage ratio on revolving credit facility					55.00%
Debt (Additional Textual) [Abstract]
Number of year non-recourse mortgage loan						7 years
Principal of non-recourse mortgage loan						$ 21,900,000
Outstanding amount on borrowings	141,000,000	141,000,000
Fixed rate interest on non-recourse loan			3.94%
Revolving credit facility borrowing limit, lower									250,000,000
Year, extension on term of revolving credit facility		1 year
Revolving credit facility borrowing limit, upper	219,400,000	219,400,000							400,000,000
Interest expense on amounts drawn on credit facility	300,000	300,000
Line of credit facility material acquisition		greater than $100 million
Line of credit facility maximum borrowing capacity subject to restriction									400,000,000
Minimum fixed charge coverage ratio on revolving credit facility							1.50
Percent minimum tangible net worth in relation to tangible net worth as of Offering									75.00%
Percent of net proceeds of any additional equity issuances in relation to net proceeds as of Offering									85.00%
Maximum principal amount of recourse indebtedness outstanding at any time, aside from revolving credit facility							$ 35,000,000
Percentage annual distributions cannot exceed funds from operations	95.00%	95.00%
Years, maximum maturities of securities								30 years
Credit facility covenants	Sep. 30, 2012	Sep. 30, 2012
Percent of secured indebtedness of the company's secured total asset value				55.00%
160 King Street [Member]
Debt (Textual) [Abstract]
Number of year amortization schedule		20 years
Debt (Additional Textual) [Abstract]
Fixed rate interest on non-recourse loan	5.68%	5.68%
Alamo Quarry Market [Member]
Debt (Additional Textual) [Abstract]
Fixed rate interest on non-recourse loan	5.67%	5.67%
Torrey Reserve - North Court [Member]
Debt (Additional Textual) [Abstract]
Fixed rate interest on non-recourse loan	7.22%	7.22%
Torrey Reserve-VCI, VCII, VCIII [Member]
Debt (Additional Textual) [Abstract]
Fixed rate interest on non-recourse loan	6.36%	6.36%
Solana Beach Corporate Centre III-IV[Member]
Debt (Additional Textual) [Abstract]
Fixed rate interest on non-recourse loan	6.39%	6.39%
Solana Beach Towne Centre [Member]
Debt (Additional Textual) [Abstract]
Fixed rate interest on non-recourse loan	5.91%	5.91%