The Gila River Indian Community and a Scottsdale development company are poised to begin work on a 3,300-acre sports and entertainment complex at Wild Horse Pass. Sunbelt Holdings President John Graham told the Tribune that the development, located just south of the Loop 202-I-10 intersection, will fill a âmissing cornerâ of the East Valley with additional hotels, a wellness center, an event center, an outdoor amphitheater music entertainment venue, sports facilities, outdoor recreation and parks, restaurants, retail and an office park. Sunbelt has partnered with the Wild Horse Pass Development Authority, the tribeâs economic development arm. The project team also includes the planning-design firms of CallisonRTKL and Kimley Horn as well as real estate consultant Elliott D. Pollack & Company.