Rella Factor, the wife of John Factor, bought the Stardust in January 1958, and finished construction. The Stardust opened on July 2, 1958, as the world's largest hotel. It had 1,065 rooms located across six motel structures, and included a casino. An adjacent hotel-casino, the Royal Nevada, became part of the Stardust in 1959, with its casino converted into Stardust convention space. A nine-story hotel addition was completed in 1964. The resort operated the off-site Stardust Country Club and the Stardust International Raceway during the 1960s, and in 1972, it became the first resort on the Las Vegas Strip to open an RV park for guests, a concept that proved to be popular.