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"Situated on prestigious North Michigan Avenue, the one-hundred-story, multi-use tower tapers from bottom to top in order to accommodate the different floor space requirements of a variety of uses. Commercial spaces occupy the base of the tower while parking, office, and residential zones rise above. The tapered form provides structural as well as space efficiency. The exterior columns and spandrel beams, together with the diagonal members and structural floors, create the steel tube. The diagonals, spandrels and columns are clearly articulated to depict the primary elements of this tube. Less than thirty pounds of steel per square foot of floor area were used in the building, equaling that of a forty- to fifty-story traditional tower. The exterior cladding is black anodized aluminum with tinted bronze glass."
from Bruce Graham. Bruce Graham of SOM. p46.
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