Island lagoon was located at the northwestern edge of the lot; it was paved in the mid-1990s to make room for a new parking structure. While under lease, the facility was renamed the CBS Studio Center. The network finally purchased the 70-acre lot outright from Republic in February 1967, for $9.5 million. That same month, Republic also sold its film library. CBS built new sound stages, office buildings, and technical facilities. To make up for these investments, CBS began to rent its studio lot to independent producers, and the newly created MTM Enterprises (headed by actress Mary Tyler Moore and then-husband Grant Tinker) became the Studio Center's primary tenant, beginning in 1970. Moore's memorable sitcom The Mary Tyler Moore Show began filming here in 1970. Later, its spinoffs Rhoda, Phyllis, and Lou Grant were shot in the facility. In July 1982, CBS formed a partnership with 20th Century Fox to share ownership of the Studio Center, thus once again renaming, this time as CBS/Fox Studios. However, that relationship was short-lived as Fox sold its interest of the Studio Center to MTM, and it became CBS-MTM Studios. In March 1992, the studio once again became CBS Studio Center, when MTM (which was later purchased by 20th Century Fox's parent company, News Corporation) sold its interest in the studio lot to CBS. From 1991 to 1996, American Gladiators was videotaped at CBS Studio Center. The original "Gladiator Arena" (Stage 3) remains preserved in its original form in its original location, with tours and group events available. The studio has been one of the most active in the city for producing sitcoms. It is also the base for "Semester in L.A.", a six-week course by Columbia College Chicago. Since 2007, the Studio Center serves as the home to CBS's Los Angeles flagship TV station KCBS-TV, along with sister station KCAL-TV, as they vacated Columbia Square to move into a newly built, digitally-enhanced office and studio facility located where the house for the CBS reality series Big Brother once stood. The CBS Studio City Broadcast Center also houses the Los Angeles bureau of CBS News, which is shared with the KCBS/KCAL local newsroom, and on occasion, the CBS Evening News is anchored from Los Angeles. In 2008, Entertainment Tonight and The Insider moved from the Paramount backlot to Studio Center, as CBS took ownership of the series after its spin-off from Viacom. A re-merged