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Construction on this massive 1.3-million-square-foot complex began in 1968 for Hemis-Fair'68. Renamed in honor of the late U.S. congressman Henry B. González, the convention center originally included a 2,500-seat theater and a domed arena. The arena was demolished during the 2001 expansion project, which gave greater exposure to the theater's facade. The theater was named in honor of former mayor Lila Cockrell. Across the top of the theater's facade is a 100 × 22–foot mosaic mural by famed Mexican architect-muralist Juan O'Gorman, The Confluence of Civilizations in the Americas, the formal theme of Hemis-Fair'68. This is O'Gorman's only American project. The expansion of the complex also expanded the Riverwalk into the center, giving conventioneers more outdoor space to enjoy.