Derek Jeter has been scouring the New York apartment market for a rental after he sold his Trump World Tower home for $15.5 million. Sources tell us that before he was injured, the Yankee captain looked at a 64th-floor, six-bedroom unit at the Park Imperial on West 56th Street that offers views of Central Park and the city, and rents for about $100,000 a month. As Page Six reported yesterday, the pad was to be rented to Robert De Niro, but he backed out of the deal at the last minute.