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Related Party Transactions (Details 2) (USD $)	12 Months Ended						1 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Sponsored REITs (no non-controlling preferred stock investment)	Dec. 31, 2010 Sponsored REITs (no non-controlling preferred stock investment)	Dec. 31, 2009 Sponsored REITs (no non-controlling preferred stock investment)	Sep. 30, 2006 Phoenix Tower	Dec. 31, 2011 Phoenix Tower	Dec. 31, 2010 Phoenix Tower	Dec. 31, 2009 Phoenix Tower	Dec. 31, 2007 East Wacker	Dec. 31, 2011 East Wacker	Dec. 31, 2010 East Wacker	Dec. 31, 2009 East Wacker	May 31, 2009 Grand Boulevard	Dec. 31, 2011 Grand Boulevard	Dec. 31, 2010 Grand Boulevard	Dec. 31, 2009 Grand Boulevard
Sponsored REITs
Equity in earnings	$ 3,685,000	$ 1,266,000	$ 1,994,000	$ 1,696,000	$ 71,000	$ 153,000		$ (14,000)	$ (47,000)	$ 30,000		$ 2,137,000	$ 1,168,000	$ 1,673,000		$ (134,000)	$ 74,000	$ 138,000
Preferred shares purchased							48				965.75				175.5
Percentage of outstanding preferred shares purchased							4.60%				43.70%				27.00%
Net cost of preferred shares purchased							4,116,000				82,813,000				15,049,000
Offering price of preferred shares purchased							4,800,000				96,575,000				17,550,000
Commissions excluded							384,000				7,726,000				1,404,000
Loan fees excluded											5,553,000				1,009,000
Acquisition fees excluded							300,000				483,000				88,000
Distributions received from non-consolidated REITs
Distributions from non-consolidated REITs	$ 3,474,000	$ 1,633,000	$ 2,283,000	$ 1,337,000	$ 391,000	$ 442,000		$ 130,000	$ 179,000	$ 125,000		$ 3,319,000	$ 3,705,000	$ 4,661,000		$ 270,000	$ 895,000	$ 400,000

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