Ex-New Yorker Oliver Stone fell in love with the city all over again — and ended up buying the stunning condo he was renting while shooting “Wall Street 2,” reports The Post’s Jennifer Gould Keil. The refugee from LA is in contract to buy a $1.9 million, 1,600-square-foot flat at One Morton Square — a luxury building with a garage, which caters to privacy-seeking celebs like Daniel Radcliffe, Amy Pohler, Will Arnett and Mike Myers. Broker Darren Sukenik of Prudential Douglas Elliman couldn’t be reached.