Ill. Admin. Code tit. 92, § 12.40
b) A displaced person may file a written request for review within 60 calendar days after receipt of written notification denying the claim. The request for review shall be filed with the Chief of Airport Engineering at #1 Langhorne Bond Drive, Springfield, Illinois 62707, (217) 785-8514, Fax #: (217) 785-4533. If the displaced person does not file a request for review within 60 calendar days after receipt of written notification denying the claim, the displaced person shall be deemed to have waived his/her opportunity to file a request for review. In that case, the approved amount of the claim, if any, will be processed for payment.
5) If the Chief of Airport Engineering's decision upholds the denial of payment, in whole or in part, the written notification will detail the reasons supporting the denial and will also advise the displaced person of his/her right to request a final review by the Director if he/she is dissatisfied with the review findings of the Chief of Airport Engineering. If the displaced person does not request a final review within 15 calendar days after written notification of the denial has been sent by the Chief of Airport Engineering, the displaced person shall be deemed to have waived his/her opportunity to file a request for a final review.