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O’FALLON, ILL. — St. Louis-based Holland Construction Services has been selected to construct a new auditorium for O’Fallon Township High School District #203 in O’Fallon. The 20,000-square-foot, steel facility will include seating capacity for 740 people. Wm. B. Ittner is providing design services for the $6.3 million project. The estimated completion date was not disclosed.