For purposes of Section 5-20(c) of the Act, the distance between a retail location and a school, pre-school, or day care facility shall be measured linearly and shall be the shortest distance between the nearest corner of the building holding the retail location to the corner of the school, pre-school, or day care facility building nearest the retail location at the time the retail location seeks licensure.
Ill. Admin. Code tit. 20, § 1232.30