Illinois Center is a mixed-use urban development in downtown Chicago, Illinois, USA, lying east of Michigan Avenue. It is notable in that the streets running through it have three levels. Elsewhere in Chicago, some streets have two levels, with the lower level for through traffic and service vehicles and the upper level for other local traffic. In Illinois Center, the lower level has been split, with a middle level for through traffic and a lower level for service vehicles.
The development was built on land that had formerly been used for railroad yards by the Illinois Central Railroad, which merged into the Canadian National Railway in 1999. The earliest building is One Illinois Center designed by Ludwig Mies van der Rohe and completed in 1970. The west half of the rail yards were built out first; the east half was for a time turned into a temporary golf course on the lowest level, where the rail yards had been. The golf course has since been turned into a park, now surrounded by an urban village of high-rise buildings called Lakeshore East.
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