The Theatre Building is part of the Arts Center, which was constructed in two phases. The Music Building was built in 1962. An addition, built in 1968, includes the Theatre, Lecture Hall, and Art Building.
The primary performance space is the 525-seat Mainstage Theatre where performances of the Professional Theatre Training Program and other groups are staged.
Built in 1965, Mainstage includes seven elevators that allow for variable thrust stage configurations including additional audience seating. At the back of the thrust is a stage opening variable from 36 feet to 52 feet in width and a stage 64 feet wide by 30 feet deep with 27 line sets. An extensive sound system and computer controlled 384 dimmer lighting system serve performances in the space.