5 ILCS 315/16

After the exhaustion of any arbitration mandated by this Act or any procedures mandated by a collective bargaining agreement, suits for violation of agreements including agreements entered into pursuant to Section 13(c) of the Urban Mass Transportation Act, between a public employer and a labor organization representing public employees may be brought by the parties to such agreement in the circuit court in the county in which the public employer transacts business or has its principal office.