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PITTSBURGH — DoubleTree by Hilton is planning a $16 million renovation of its 465-room hotel in Pittsburgh. The hotel is Hilton's largest in the market, and the project is scheduled for completion by the end of 2012. RIDA Development Corp. will direct the redesign of the Doubletree by Hilton Pittsburgh-Green Tree. The team includes interior design company, Looney & Associates. Renovations are planned for the lobby, guest rooms and the business and fitness centers.