Occupying a half city block in Tulsa's historic downtown, the Performing Arts Center is the design of Minoru Yamasaki, architect of the former World Trade Center towers. The PAC houses four theaters, a studio space and a large reception hall. The Center’s largest theater is Chapman Music Hall, seating 2,365. Its main entrance is on 3rd Street. The facility’s second largest theatre is the 430-fixed-seat John H. Williams Theatre. The Liddy Doenges and Charles E. Norman Theatres offer flexible seating. The Williams, Doenges and Norman Theatres are accessed from the PAC’s Second Street entrance. A ticket office is open in the 2nd Street lobby prior to events in those theatres. The Westby Pavilion and Robert J. LaFortune Studio are located on the PAC’s Promenade level. All spaces at the PAC may be rented by the public. Arts patrons come to the PAC year round to attend a performance from one of Tulsa's acclaimed arts groups, to sample national and international talent, to stage or attend various social functions or Art Gallery exhibits and to view the PAC's extensive permanent collection of more than 70 pieces of art. The Tulsa Performing Arts Center is owned and operated by the City of Tulsa. The private interests that guided the building of the PAC in the early 1970s formed a trust to help the City maintain the facility, expand it and fill its theaters with events. The Tulsa Performing Arts Center Trust is still a vital part of PAC operations. Among its activities, the Trust gives grants to performance groups, and plans and operates the Center’s annual SummerStage festival (June through August).