Clark/Lake is an 'L' station serving the CTA's Blue, Brown, Green, Orange, Pink, and Purple Lines. It is located at 100/124 West Lake Street in Chicago's Loop district, and is accessed from the James R. Thompson Center and 203 North LaSalle building. It is one of the most complex stations on the 'L' system. In June 2006 it had an average of 17,665 weekday passenger entrances, making it the busiest station in the 'L' system. The Richard J. Daley Center, Chicago City Hall, and Chicago Title and Trust Center are also served by the station.