“Maryland car dealer Jack Antwerpen and his wife paid $18.5 million for a waterfront mansion in Gulf Stream, north of Delray Beach. It’s the most expensive sale in Gulf Stream this year, records show. Developer Robert Fessler, who set a “spec mansion” record in 2017 with a $49 million sale in Palm Beach, sold the renovated seven-bedroom, 13-bathroom estate at 3777 North Ocean Boulevard to Jack and Dolores Antwerpen. Fessler paid $7.6 million – about $542 a foot for the roughly 14,000- square-foot-house in 2017 and later gut-renovated it. Candace Friis of The Corcoran Group was the listing agent.”