311 South Wacker Drive in Chicago was designed by Rick del Monte with Kohn Pedersen Fox Associates and HKS, and developed by Gerald Kostelny and the Lincoln Property Company. Construction began in 1988 and finished in 1990. The text calls the style post-modern. The reinforced concrete tower has 65 floors and 34 elevators, with 1,400,000 square feet (130,000 m²) of floor area.
It rises 961 feet (292.9 m) to its architectural height, and the roof is also given as 293 m. The crown is a 105-foot (32 m) translucent cylinder with four smaller cylinders, lit by 1,852 fluorescent tubes. The lobby winter garden is 85 feet (26 m) tall with a glass ceiling. A bronze sculpture, Gem of the Lakes by Raymond Kaskey, stands outside.
It was the tallest on Wacker Drive from 1990 to 1992, and the tallest building known only by its address until 432 Park Avenue in 2015. Companion towers planned for the site were never built.
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