Kenneth Griffin, the billionaire founder of the hedge fund Citadel, broke a real estate record on Wednesday when he closed on his purchase of a penthouse at 220 Central Park South for $238 million. It’s the highest price anyone has paid for a home in the United States, and $100 million above the previous record.



Mr. Griffin went to contract on the apartment, in a building that was still being developed, in 2015 amid a real estate buying spree that includes a London mansion he bought this week for 95 million pounds, or about $122 million.