Amarillo BuildingThe Amarillo Building, at 301 S Polk Street, is a historic office building in Amarillo, Texas, United States.HistoryThe Amarillo Building was constructed in the mid-1920s by the Shepard & Wiser architectural firm. With two towers, it is considered the oldest skyscraper in Amarillo. It was added to the National [Register of Historic Places] on February 23, 2018.