The Illinois

The Mile-High Illinois, or simply The Illinois, is an unbuilt conceptual design by American architect Frank Lloyd Wright for a one-mile-high (1.6 km) skyscraper to be built in Chicago. Wright described the project in his 1957 book, A Testament. The design included 528 stories, later revised to 365 stories, with a gross area of 18,460,000 square feet (1,715,000 m2). Wright stated that there would be parking for 15,000 cars and 100 helicopters. If built, it would top the list of the tallest buildings in the world by far, being more than four times the height of the Empire State Building, almost twice as tall as the world's tallest building as of 2026, the Burj Khalifa; and about 2,400 feet (730 m) taller than the under-construction Jeddah Tower – the latter two both designed by Adrian Smith, whose designs for both buildings are said to have been inspired by that of The Illinois.