One Eleven Congress, formerly One Congress Plaza, is a skyscraper in Downtown Austin, the state capital of Texas in the United States. Standing 397 feet tall and containing 30 floors, the building is the 23rd tallest in Austin. The building contains a sunken plaza, which include trees, a food hall, water features, and park benches, as well as the location for the …One Eleven Congress, formerly One Congress Plaza, is a skyscraper in Downtown Austin, the state capital of Texas in the United States. Standing 397 feet tall and containing 30 floors, the building is the 23rd tallest in Austin. The building contains a sunken plaza, which include trees, a food hall, water features, and park benches, as well as the location for the AMOA Art Show.