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There's something surprising on the 41st floor of Willis Tower

This summer, Chicago-based ShopperTrak completed the buildout of a 52,000-square-foot perch on the 41st floor of Willis Tower. The technology company installs and configures hardware that provides stores with traffic and point-of-sale data. Its 140 employees seem to appreciate their new Harley Ellis Devereaux-designed digs. “I would say it’s improved the mood of the office tremendously,” says CEO Christopher Ainsley. He and Harley Ellis Devereaux managing principal Enrique Suarez showed us around the space and its sky-high warehouse.