Citadel founder Ken Griffin says New York City Mayor Zohran Mamdani has proven that he made the right choice in moving from Chicago to Miami. “What the mayor of New York has made clear to my partners, and principally my New York partners, is that we need to double down on our bet in Miami," Griffin said during an interview at the Milken Global Conference. He also wouldn't say if he's going to finish building a new tower in Manhattan at 350 Park Avenue.