Oklahoma City could have the tallest building in the United States in the next few years. The OKC City Council agreed to waive height restrictions to allow the Legacy Park project to move forward. If completed, the building would be the tallest in the United States. The plans allow for a structure that is 1,907 feet tall. That number is a nod to the year 1907, when Oklahoma became a state. Should the project be completed, this would cement OKC as a big league city with an international profile.