Sixteen massive concrete arches span 275 feet to form this facility, the largest column-free exhibit hall in the world. At the time of construction, it was also the largest poured-in-place concrete building structure ever built in California. Measuring approximately 780 feet by 350 feet, including usable space beyond the base of the arches, the hall contains 275,000 square feet. With a ceiling height of 37 feet, the 6.3-acre hall features a main ballroom seating 4,000 people and 31 other rooms holding from 50 to 600, and a kitchen that can serve 6,000. Except for its lobby, which is the size of a football field, the convention center was constructed underground with its roof capable of supporting several low-rise buildings.

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