A planned observatory atop the Aon Center could welcome its first thrill seekers in less than two years as the Chicago skyscraper’s owner nears zoning approval for the $185 million addition overlooking Millennium Park.
A planned observatory atop the Aon Center could welcome its first thrill seekers in less than two years as the Chicago skyscraper’s owner nears zoning approval for the $185 million addition overlooking Millennium Park.