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Author Walter Isaacson and his wife, Cathy, have sold their co-op at 65 Central Park West for $4.2 million. It was listed for $4.55 million. The pair bought the three-bedroom, three-bathroom perch in the Emery Roth-designed building for $3.05 million in 2012. Isaacson, a history professor at Tulane University in his hometown of New Orleans, is...