Public Auditorium (also known as Public Hall) is a multi-purpose performing arts, entertainment, sports, and exposition facility located in the civic center district of downtown Cleveland, Ohio. The 10,000-capacity main auditorium shares its stage with a second venue housed at the facility: the 3,000-capacity Music Hall. Although Public Auditorium was planned and funded prior to World War I, construction did not begin until 1920, and the building did not open until 1922. Designed by city architect J. Harold McDowell and Frank Walker of Walker and Weeks in a neoclassical style matching the other Group Plan buildings, it was the largest of its kind when opened, then seating 11,500. Construction and expansion The auditorium cornerstone was laid October 20, 1920, and the completed building was dedicated April 15, 1922. Smith & Oby was one local company involved in the project, at the time the largest convention hall in the United States. The main arena floor is and high. No columns were used in its construction. With all its removable seats in place on the arena floor and in the balcony, the hall could seat 13,000. The main stage is with a proscenium arch. A key attraction was a spectacular pipe organ, Opus 328, the largest ever built at one time by E.M. Skinner with 10,010 pipes and 150 direct speaking stops. Below ground, a basement Exhibition Hall provided more than of exhibition space. This space was reached by an elegant stone staircased with bronze lights which led down from Public Auditorium's lobby. But the exhibition space itself was uninviting. It had an asphalt floor, was undecorated, and was interrupted by more than 40 columns. Cleveland's Public Auditorium was considered so advanced architecturally that it became the model for similar public auditoriums in Atlantic City and Philadelphia. Greater Cleveland Sports Hall of Fame The Greater Cleveland Sports Hall of Fame displays duplicates of many of the plaques it has awarded in the lobby at the Lakeside Avenue entrance to the Cleveland Public Auditorium. 1928 and 1936 additions In 1928, the Music Hall and Little Theater were added at the south end of Public Auditorium, and a terrace added to the north end. The stage between the main hall and Music Hall was shared by both halls by employing a curtain system. In 1936, two underground spaces were added to Public Auditorium. The ballroom was built beneath Mall B of the Cleveland Mall,