Architect: Cesar Pelli & Associates
Proposed and approved in 1990, the Miglin-Beitler Tower was intended to be the tallest building in the world at 1,999 feet. It would not just have been the tallest building in the world, but one of the most slender as well, utilizing a basic 140′x 140′ footprint with 8 projecting “fin” columns. It was these columns which would have given the tower its ability to resist lateral forces with a minimal of deflection. They were to be made of high strength concrete with varying dimensions of 6′-6″ x 33′-0″ at the base to 4′-6″ x 13′-0″ in the upper levels. The central core (62′-6″ square) would house elevators and other services permitting efficient use of the cruciform floor plates.
The 125-story project would feature a public observation area at 1,486′ and a 600′ steel framed spire and communications tower comprised from 12 steel perimeter columns. The project was never developed because of the start of the Gulf War and the eventual collapse of the Chicago real estate market in late 1990.