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NEW YORK CITY — TGM Associates, an investment advisory firm focusing on multifamily properties, has renewed its 11,280-square-foot lease at 650 Fifth Ave. near Rockefeller Center for 10 more years. TGM will occupy the entire 28th floor of the 36-story office building in the Plaza District on 52nd Street. Built in 1979 and previously known as the Piaget Building, 650 Fifth Ave. is a 382,500-square-foot tower owned by 650 Fifth Avenue Co.