Real Estate Investments, Debt Instruments (Details) (USD $)	3 Months Ended				3 Months Ended
	Sep. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2011 Mortgages [Member] Fountain at La Brea - bond financing [Member]	Dec. 31, 2011 Mortgages [Member] Santa Monica at La Brea - bond financing [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate (in hundredths)			2.50%
Secured mortgage loans on real estate					$ 54,500	$ 59,900
Mortgage loan on property acquired, maturity date					Oct. 31, 2046	Dec. 31, 2046
Interest rate swap, termination date	Sep. 30, 2016
Interest rate swap, description of variable interest rate basis	SIFMA	SIFMA
Interest rate swap, basis spread on variable rate (in hundredths)	1.50%			1.50%