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Wikipedia: The Old Chicago Main Post Office is a nine story tall building in Chicago designed by Graham, Anderson, Probst & White, built in 1921. The original structure was a brick sided mail terminal building that still sits just east of the main building that engulfs the Eisenhower Expressway right before it turns into the Congress Parkway. It underwent a major expansion in 1932 which added a total of nine floors with more than 60 acres, or 2.5 million square feet (230,000 m²) of floorspace.
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![Old Main Post Office over the Eisenhower Expressway. [Old Main Post Office over the Eisenhower Expressway.]](http://images.ookaboo.com/photo/s/Old_Post_Office_s.jpg)