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Investments in Real Estate Entities (Details) (USD $) | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended |  | 3 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 community | Sep. 30, 2013 | Sep. 30, 2014 Fund I community | Sep. 30, 2014 Fund I RutherfordStation [Member] home | Sep. 30, 2014 Fund I Weymouth Place home | Sep. 30, 2014 Fund I South Hills [Member] home | Sep. 30, 2014 Fund I Springs home | Sep. 30, 2014 Joint Venture Partners [Member] Springs | Sep. 30, 2014 Fund II | Sep. 30, 2014 Fund II Avalon Bellevue Park [Member] home | Sep. 30, 2014 Fund II Avalon Fair Oaks home | Sep. 30, 2014 CVP I, LLC [Member] sqft | Sep. 30, 2014 CVP I, LLC [Member] home sqft | Sep. 30, 2014 Equity Method Investee [Member] | Sep. 30, 2014 Unconsolidated real estate entities entity | Sep. 30, 2014 Unconsolidated real estate entities Minimum | Sep. 30, 2014 Unconsolidated real estate entities Maximum | Sep. 30, 2014 Residual JV | Sep. 30, 2014 Residual JV | Jun. 30, 2014 Secured notes | Sep. 30, 2014 Secured notes Notes payable maturing in 2014 Fund I Springs
Investment in Real Estate Entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of unconsolidated real estate entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |
Ownership interest percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% | 20.00% |  |  | 15.20% | 31.30% |  |  |  |
Number of Apartment Communities Sold |  |  | 3 |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of apartment homes sold |  |  |  |  |  | 108 | 211 | 85 | 320 |  |  | 220 | 491 |  | 361 |  |  |  |  |  |  |  |
Area of Real Estate Property |  |  |  |  |  |  |  |  |  |  |  |  |  | 71,000 | 71,000 |  |  |  |  |  |  |  |
Proceeds from sale of real estate |  |  |  |  |  | $ 34,250,000 | $ 25,750,000 | $ 21,800,000 | $ 43,200,000 |  |  | $ 58,750,000 | $ 108,200,000 | $ 365,000,000 |  |  |  |  |  | $ 8,249,000 | $ 51,361,000 |  |
Gain on sale of communities | 327,539,000 | 5,395,000 | 333,221,000 | 70,662,000 |  | 345,000 | 545,000 | 54,000 | 2,373,000 | 14,132,000 |  | 8,450,000 | 13,174,000 | 50,478,000 |  |  |  |  |  |  | 7,548,000 |  |
Equity Method Investment, Underlying Equity in Net Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 57,489,000 | 57,489,000 |  |  |  |  |  |  |  |
Percentage of gain (loss) from sale of real estate recognized in income |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of land | 0 | 0 | 0 | 240,000 |  |  |  |  | 16,656,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners |  |  |  |  |  |  |  |  | 84.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of secured mortgages |  |  |  |  |  |  |  |  |  |  | 42,023,000 |  |  |  |  | 198,961,000 |  |  |  |  |  | 5,914,000 | 21,748,000
Gains (Losses) on Extinguishment of Debt | $ 0 | $ 0 | $ (412,000) | $ 0 |  |  |  |  |  |  |  |  |  |  |  | $ 2,339,000 |  |  |  |  |  |  |
Fixed rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.06%

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