High Quality Content by WIKIPEDIA articles! The tallest building in the U.S. city of Seattle, Washington is the 76-story Columbia Center, which rises 937 feet (286 m) and was completed in 1985. It is currently the 20th-tallest building in the United States, and the tallest building in the state of Washington. The second-tallest skyscraper in the city and the state is the 1201 Third Avenue, which rises 772 feet (235 m). The twenty tallest buildings in Washington are located in Seattle.