Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 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.
