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Grim news for residents of Greenwich: Real estate prices plunged the most in three decades in 2008—the median home price fell 7 percent—and the number of houses sold dropped by more than a third as the financial crisis roiled the finance-heavy suburb. Billionaire hedge fund manager Steve Cohen isn't selling his 31,642-square-foot, nine-bedroom palace, as far as we know. But if he were going to do so, it's safe to say having a 6,734-square-foot ice skating rink on your property isn't worth as much as it once was. [NYP]