Aon Center owner wants to start building Chicago’s third observatory by spring

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.

Read more: https://www.chicagotribune.com/business/columnists/ori/ct-biz-aon-center-observatory-ryan-ori-20181219-story.html

Aon Center owner wants to start building Chicago’s third observatory by spring

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