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NEW YORK CITY — A four-story apartment building at 310 West 90th St. in Manhattan's Upper West Side has sold to a private investor for $3.1 million. The building is 5,780 square feet and is currently configured as nine apartment units, of which, one is rent controlled and eight are rent stabilized. Hall Oster and Paul Smadbeck of Massey Knakal represented both parties in the transaction.