105 ILCS 5/10-23.6

A school district, including any special charter school district, having 100,000 or more inhabitants and maintaining grades 1 through 12 may acquire a school site in any other school district which does not maintain a recognized public high school, provided that such site lies within two miles of the boundaries of such school district, and may build, operate and maintain a school maintaining grades 9 through 12 upon any site so acquired, and for these purposes may borrow money and issue bonds as otherwise provided by law and charge and receive tuition for students attending said school from any other school district, to the same effect as if said school had been constructed within the boundaries of said school district.