311 South Wacker Drive in Chicago, Illinois

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311 South Wacker Drive in Chicago, USA is a 65-story post-modern skyscraper completed in 1990. At 961 feet tall, it stands as the seventh tallest building in Chicago and the twenty-first in the United States. Once the world's tallest reinforced concrete structure, this massive building also holds the distinction of being known solely by its street address. The lower level of the winter garden was designed to connect via underground passageway to Chicago Union Station. Three levels of underground parking are available within the building, which houses both retail and commercial tenants. The lobby boasts a two-level glass-ceilinged "winter garden" 85 feet tall, featuring palm trees and a fountain supported by a steel structure influenced by the Chicago "L" tracks and bridges. Envisioned as a commuter link or "pedestrian station," this area was intended to connect from nearby Union Station through a disused streetcar tunnel under the South Branch of the Chicago River. Raymond Kaskey's bronze sculpture, "Gem of the Lakes," overlooks the garden from the Wacker entrance. The fountain shell form is taken from the city seal, with a heroic figure representing Chicago as the "city of broad shoulders" wearing a cape symbolic of the great engineering feat that reversed the flow of the Chicago River. Atop the building stands a 105-foot translucent cylinder, surrounded by four smaller cylinders inspired by the massing of the Tribune Tower. This makes it one of the most visible Chicago skyscrapers at night, as its crown is brightly illuminated. The five cylinders on top are lit at night by 1,852 fluorescent tubes, and a lantern changes colors for various holidays and special events.