Read more: Children’s Health to open campus in Prosper TynanGroup has previously developed the Sheraton Arlington Hotel. TynanGroup is a leader in hospitality development, With over $8 billion worth of hotel, resort and casino experience. The expansion includes the addition of 1,000 hotel rooms, an expanded gaming floor and new pools with a lazy river.Ĭhoctaw Nation has appointed TynanGroup as the official developer for the expansion. Last Thursday, Choctaw Nation of Oklahoma broke ground on an expansion project at its resort property in Durant, Oklahoma.