Chatham resident Judy Grunberg, owner of the Blue Plate restaurant and the founder of the PS/21 arts center, is among a group of investors close to finalizing a deal to buy Chatham's Crandall Theater, The Columbia Paper, and other papers, report today after the "For Sale" sign came down Thursday. When owner Tony Quirino died in January, he had been working to sell the theater to the Chatham Film Club, though the Club now is among two bidding groups that apparently lost to the Grunberg group. The Grunberg group is reportedly talking with the film club about extending the theater's previous collaborations.