35 ILCS 200/29-10
No amount may be claimed from the State by or on behalf of any unit of local government for any local improvement made by special assessment or special tax that benefits, or is alleged to benefit, abutting property owned by the State unless the State has been made a party to all proceedings, has been given all notices, and has been afforded the same opportunities for hearing and for objecting to the assessment in the same manner and under the same conditions as provided in the law applicable to the making of the local improvement by special assessment or special tax by that unit of local government.
For the purposes of this Article, any notices required under applicable law must be sent by registered or certified mail to the Director of the Department or the other State officer having jurisdiction over the State property affected, to the Director of Commerce and Economic Opportunity , and to the Attorney General.
35 ILCS 200/29-10