The 410-seat Casino Theater, along with its neighboring twin, the Court Tennis Building, form the eastern wall of the six-acre Newport Casino complex of buildings and tennis courts. The Theater, designed by McKim, Mead, and White, was built in the early 1880s. The two-story building, measuring approximately 90 feet long and 80 feet wide, is supported by wood and masonry construction. A stuccoed concrete block stage-set addition, approximately 30 feet deep and 50 feet wide was added to the east end of the Theater in the 1930s. The orchestra pit and dressing rooms are located in the basement, under the stage.