The Illinois
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The Mile-High Illinois, Illinois Sky City, or simply The Illinois is a concept proposal for a skyscraper that was to be over 1 mile high and was conceived and described by American architect Frank Lloyd Wright in his 1957 book, A Testament. Wikipedia
Antenna spire: 5,680 ft (1,730 m)
Floor area: 18,460,000 square feet (1,715,000 m2)
Floor count: 528
Lifts/elevators: 76
Status: Never built