Section 755 ILCS 5/18-6 - Jury trialAny interested person may demand a jury to try the issue in accordance with the following, otherwise he waives a jury:
(a) A claimant or counterclaimant must file the jury demand at the time of filing the claim or counterclaim.(b) A person opposing a claim or counterclaim must file the jury demand not later than the filing of his answer or other pleading.(c) If the claimant or counterclaimant files a jury demand and thereafter waives a jury, the person opposing the claim or counterclaim shall be granted a jury trial upon demand therefor made promptly after being advised of the waiver. For good cause shown, the court may permit a jury demand to be filed after expiration of the time specified.