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Real estate (Details 3) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Jun. 30, 2012 | Jun. 30, 2013 Corporate Joint Venture | Jun. 30, 2012 Residential Operating Properties | Jun. 30, 2012 Commercial Operating Properties
Real Estate Properties [Line Items] |  |  |  |
iStar's ownership percentage, consolidated |  | 63.00% |  |
Fair value of assets acquired |  | $ 25.5 |  |
Properties acquired | $ 185.8 |  | $ 172.4 | $ 13.4

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