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Three First National Plaza is a 57-story office tower in Chicago. Completed in 1981, the building is one of the tallest in Chicago at 767 feet (234 m). The 1,439,369-square-foot (133,721.8 m) building was designed by Skidmore, Owings & Merrill in a sawtooth shape to minimize obstructions it might cause to nearby buildings. The design also allows for thirteen corner offices on lower floors and nine corner offices in the upper regions.