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The base of the building is expressed as a massive wali. The next two setbacks are Office floors supported by a center core. Exterior columns appear at the frist notch. Above the first notch, 20 floors of residential units are cantilevered from the central core to a distance of 30 feet. Above the second notch, are 20 additional floors of residential units with a depth to the central core of 22 feet, thus allowing morę light per square foot of living area. At the third notch, the cantilever reduces to 10 feet and the formation becomes communication related facilities, transformers, antennaes and microwave equipment for high density TV broadcasting. These floors have non-metallic mullions and elear glass exterior walls.

The notches of 7 South Dearborn have a number of distinctive uses. Primarily, they