CHICAGO (AP) — Chicago’s third-tallest skyscraper could get a $185 million observation deck and an attraction that would dangle visitors over the building’s edge.

The Chicago Tribune reports that Aon Center officials unveiled the observatory plans Monday. They include a feature called the Sky Summit, gondola-like compartments with windows and see-through floors that would be lifted over the building’s side.

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Officials hope to take advantage of the center’s location near Millennium Park.

Chicago already has observatories at Willis Tower and the former John Hancock Center.

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Steve Sales is principal of the New York-based 601W Cos., the Aon Center’s owner. He says officials believe there’s a market for all three attractions.

601W Cos. estimates the proposed project would take two years to build and could attract 2 million visitors annually.

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