Subsequent Events (Details Textual)	6 Months Ended
	Jun. 30, 2012
Subsequent Events (Textual) [Abstract]
Ending date of initial term agreement	Dec. 31, 2013
Term under agreement	which term will automatically be renewed until June 30, 2015 unless either party to the agreement provides written notice of cancellation before June 30, 2013
Bank Branch Facility for Office or Retail [Member]
Subsequent Event [Line Items]
Percentage of gross income generated property	2.50%
Multi-tenant Industrial Property [Member]
Subsequent Event [Line Items]
Percentage of gross income generated property	4.00%
Multi-family Property [Member]
Subsequent Event [Line Items]
Percentage of gross income generated property	3.75%
Multi-tenant Office Property [Member]
Subsequent Event [Line Items]
Percentage of gross income generated property	3.75%
Multi-tenant Retail Property [Member]
Subsequent Event [Line Items]
Percentage of gross income generated property	4.50%
Single-tenant Industrial Property [Member]
Subsequent Event [Line Items]
Percentage of gross income generated property	2.25%
Single-tenant Office Property [Member]
Subsequent Event [Line Items]
Percentage of gross income generated property	2.90%
Single-tenant Retail Property [Member]
Subsequent Event [Line Items]
Percentage of gross income generated property	2.90%