Organization and Business (Details) (USD $)	36 Months Ended								0 Months Ended	36 Months Ended			6 Months Ended
	Sep. 16, 2008	Jun. 30, 2012	Dec. 31, 2011	Sep. 15, 2008	Jun. 22, 2006	Sep. 15, 2005	Jun. 30, 2012 Nathan Lane Building	Jun. 30, 2012 Commerce Street Building	Sep. 27, 2005 Wells Management	Sep. 16, 2008 Acquisition Fees	Sep. 16, 2008 Selling Commissions, Discounts, and Dealer-Manager Fees	Sep. 16, 2008 Other Offering Expenses	Jun. 30, 2012 Minimum	Jun. 30, 2012 Maximum
Real Estate Properties [Line Items]
Liquidation period of properties after acquisition (in years)													3 years	5 years
Proceeds from contributed capital									$ 1,000,000
Member shares authorized (in shares)		150,000	150,000			150,000
Shares subscribed but unissued (in shares)					10,000
Member shares issued (in shares)		51,854	51,854	51,854
Gross proceeds from issuance of member shares	51,854,000
Stock issuance costs										1,037,000	2,852,000	259,000
Proceeds from issuance of member shares	$ 47,706,000
Leased office space of properties (percent)							45.00%	85.00%