Rate Field is a baseball stadium on the South Side of Chicago, Illinois. It is the home ballpark of the Chicago White Sox, one of the city's two Major League Baseball teams, and is owned by the state of Illinois through the Illinois Sports Facilities Authority. Built for US$137 million, the park opened as Comiskey Park on April 18, 1991, taking its name from the original Comiskey Park, the team's home since 1910.