A rendering shows the Grand Arrival Gallery, which will be the new entryway for the Cox Business Center once renovations are complete in 2020. (Courtesy Cox Business Center)

Work began this week on a $55 million renovation in the Cox Business Center that will expand the exhibition space and entryway at the downtown Tulsa, Okla., convention center.

The plan is to blow out the inside of what was a 9,000-seat arena inside the building while keeping the shell of the structure intact....

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