Dilworth is best known for being the leading manager of Room 5600, known now as Rockefeller Family & Associates, the family office of the Rockefeller family, situated on the 54-56th floors of the GE Building, 30 Rockefeller Plaza, in Rockefeller Center.
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The NBC headquarters—the GE Building in Rockefeller Center, home of NBC News and MSNBC—is located south on Sixth Avenue at 50th Street.