High Quality Content by WIKIPEDIA articles! 311 South Wacker Drive in Chicago, USA, is a post-modern 65-story skyscraper completed in 1990. At 961 feet (293 m) tall, it is the seventh tallest building in Chicago and the 16th tallest in the United States. It was once the second tallest reinforced concrete building in the world (after Two Prudential Plaza, also in Chicago).The building is also the tallest building in the world known by its street address.