the Las Vegas Strip to offer an RV park, although other resort owners were skeptical that such a concept could work. Camperland included its own swimming pool, playground, and recreational hall. It was an immediate success, and plans were quickly announced to expand the site to 400 spaces. The Camperland expansion was completed in 1973, and plans were announced for a 17-story hotel tower, although it ultimately would not be until 1990 that the resort added a high-rise tower. Under Argent's ownership, the casino was enlarged and a sportsbook was added during 1975. Argent also sought approval to build a 19-story hotel tower. The first phase of a $70 million expansion was finished in July 1976. The casino, at , was the largest in the world according to Glick. Among the new features was an expanded sportsbook. Glick also still planned to add additional hotel rooms, which would be built behind the Stardust. Portions of the existing resort would have to be demolished to accommodate the proposed hotel expansion. In 1981, the resort launched Stardust Line, a radio sports show that broadcast across the United States. It continued airing for the next 25 years. The Stardust sportsbook became popular across the United States in the late 1980s, after being featured in various media such as television news and magazines. The sportsbook offered Las Vegas' first line in betting, and was popular among professional bettors. The sportsbook offered unique betting rules during its peak, before adopting a more conventional approach in 1991. During its final decade, the Stardust offered a popular head-to-head football handicapping contest, held each Friday night. The sportsbook also allowed betting on any kind of sport. After taking ownership, the Boyds spent $6 million on room renovations, and plans were announced in 1986 for another $26 million in renovations. A $50 million renovation project was finished in 1987, adding a shopping mall and other features, including a new resort entrance. The renovation also added the Olde-Tyme Gambling Museum, featuring antique slot machines. The Stardust was one of the few Strip properties without a high-rise hotel tower, and there were plans to eventually add one. In early 1990, construction was underway on the 32-story tower and a conference center. The RV park closed that year to make room for the expansion. The first 700 rooms of the tower were opened on December 21, 1990, along with the conference center.