The Aqua Tower is an 86-story mixed-use residential skyscraper located on the 200 block of North Columbus Drive, and is surrounded by high-rises. Designed by a team led by Jeanne Gang of Studio Gang Architects, the building is the tallest in the world to have a woman as lead architect, at 859 ft (262 m). To capture views of nearby landmarks for Aqua's residents, Gang stretched its balconies outward by as much as 12 feet (3.7 meters). The result is a building composed of irregularly shaped concrete floor slabs which lend the facade an undulating, sculptural quality. Gang cites the striated limestone outcroppings that are a common topographic feature of the Great Lakes region as inspiration for these slabs.