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Steel Gymnasiums and Sports Arenas Topline Steel Building Systems realizes that a gymnasium needs column-free interiors, high ceilings, and design flexibility. That is why we offer steel sports arenas and gymnasiums that are fully customizable to accommodate any sporting event. What do you need - indoor tennis courts, ice hockey rink, basketball court, driving range, paintball facilities? Let us help you. Topline metal buildings are fully customizable allowing you to choose a variety of standard or custom sizes. Our clear span interiors are specially designed for indoor sporting events providing interior building widths of up to 200 feet with unlimited lengths. Topline steel buildings save you time and money by selling directly to you, our valued customer. Topline specializes in designing sports arenas and gymnasiums.