Info from Wikipedia
Allstate Arena is a multi-purpose arena in Rosemont, Illinois, United States, northwest of Chicago, located at the corner of Mannheim Road and Lunt Avenue, just north of Mannheim Road's interchange with the Jane Addams Memorial Tollway (I-90) about 3 miles (4.8 km) north of O'Hare International Airport. The facility opened in 1980 as the Rosemont Horizon and seats 17,500 for basketball and 16,692 for ice hockey.