Originally called Library Square, the First Interstate World Center is the tallest building west of Chicago. It is 73 stories tall with central plants on the 5th ( 3 x 1,200 tons) and 56th (2 x 400 tons) floors as well as field erected cooling towers on the 5th floor.

Each of the 66 office floors is served by cold and bypass double ducts from floor by floor air handlers.

This project was a plan and specification project. When the original mechanical contractor went bankrupt, ACCO was selected by the bonding company to complete the project based on Turner’s “high recommendations” as the only contractor capable of completing the project on short notice.

Project Data

• Three 1,200 Ton Chillers
• Two 400 Ton Chillers

Project Team

• Owner - Maquire Thomas Partners
• Architect - I.M. Pei and Ellerbe Beckett
• General Contractor - Turner Construction
• Mechanical Engineer - James A. Knowles & Associates