Construction work on the $185m Aon Center Observatory Tower Renovation located in Chicago, Illinois, the US commenced in Q2 2022. It was announced in Q1 2015.

The project involves the renovation of a 346m high 83-story office tower in Chicago, Illinois, the US.

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The project includes the following:

1. Construction of a lounge
2. Construction of a restaurant
3. Construction of an event space
4. Installation of a glass elevator
5. Installation of observatory
6. Installation of safety and security systems

Construction on the project is expected to be completed by Q4 2024.

Owners of the project include the US-based 601 W.

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