Commission approved Sarno to return as the operator of Circus Circus. The casino was unable to attract high rollers, due to its lack of a hotel. In 1971, the Teamsters' Union pension fund provided a loan to Circus Circus to pay off debts and to add a hotel. A 15-story tower opened in July 1972. As part of the loan arrangement, the Chicago Outfit's enforcer, Anthony Spilotro (under the name of Tony Stuart), was granted a gift shop concession in the hotel. In addition to a government investigation into the organized-crime connections, Sarno and Mallin were also being investigated for tax code violations. The casino's financial problems also continued, and Sarno began discussions to bring in a new casino operator. Ownership changes and later years In April 1974, William Bennett and William Pennington were approved by the state as new operators of the casino. They leased Circus Circus from Sarno and Mallin, who remained as landlords for several years. Bennett and Pennington had been searching for a financially challenged Las Vegas casino that they could take over. They originally considered the Landmark, before settling on Circus Circus. Bennett was initially skeptical that a family friendly casino could succeed in Las Vegas. However, he and Pennington quickly turned Circus Circus into a profitable venture. Under their management, the casino contained mostly slot machines, and did not cater to big gamblers. Although the casino was mocked for its theme, it had wide appeal among the middle-class demographic. Various additions were made over the years, including an RV park in 1979, followed by motel structures the following year. Bennett said in 1981, "I don't believe kids and gambling mix. If I had to start over, I would not use this concept. We end up being babysitters for the town, which is fine, but we have a lot of problems because of all the kids around. We have more security wandering the floors than most hotels." Bennett and Pennington operated the property through Circo Resorts, Inc, which would later become Circus Circus Enterprises. In their lease, they had an option to buy Circus Circus from Sarno, which they eventually did in 1983. By that point, Circus Circus was one of the most successful casinos in the state. A 29-story hotel tower was added in 1986, followed by the Adventuredome amusement park in 1993. A 35-story tower was added during renovations in 1996, part of