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What design did Louis Sullivan propose for the unbuilt Fraternity Temple in Chicago?

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The proposed design for the unbuilt Fraternity Temple (1891) in Chicago was intended to be a symmetrical structure featuring bold step-back forms and a soaring 35-story central tower.1

Although this project was never realized, it remains one of the most dramatic skyscraper designs conceived by Louis Sullivan, an architect widely regarded as the spiritual father of modern American architecture.12