SUBSEQUENT EVENTS (Details) (USD $)	9 Months Ended		1 Months Ended			1 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Oct. 31, 2012 Acquisition Home Depot Bloomfield, New Jersey sqft	Oct. 31, 2012 Issuance of equity	Oct. 31, 2012 Issuance of debt Mortgages LIBOR plus 2.15% Mortgage Note	Oct. 31, 2012 Issuance of debt Fund III Mortgages LIBOR plus 2.15% Mortgage Note properties	Oct. 31, 2012 Issuance of debt Fund III Mortgages Mortgage Note on Six Self Storage Facilities properties	Oct. 31, 2012 Issuance of debt Fund III Mortgages Subscription Line of Credit
Subsequent Event [Line Items]
Square Footage of Real Estate Property (in square feet)			129,000
Business Acquisition, Cost of Acquired Entity, Purchase Price			$ 12,500,000
Stock Issued During Period, Shares, New Issues (in shares)				3,500,000
Stock Issued During Period, Value, New Issues				86,900,000
Proceeds from Issuance of Common Stock	96,540,000	0		85,800,000
Mortgages payable, face amount						120,000,000
Length of loan extension option						1 year
Basis Spread					2.15%
Long-term Debt, Refinanced Amount							$ 41,900,000	$ 82,900,000
Number of Self-Storage Facilities Refinanced (in Properties)						11	6