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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 300 ft × 215 ft (91 m × 66 m) and 80 ft (24 m) 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 140 ft × 60 ft (43 m × 18 m) with a 72 ft × 42 ft (22 m × 13 m) 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 28,500 sq ft (2,650 m2) 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.
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