70 ILCS 605/5-7
The commissioners and any parties interested have the right to a trial by jury upon all questions as to benefits and damages to any lands and property affected, if a written demand for a jury is filed on or before the date and hour fixed for hearing on the assessment roll. If no demand for a jury trial is filed, then all parties shall be deemed to have waived a jury, and the court shall proceed to hear and determine all questions as to benefits and damages to any lands and other property without a jury. If a trial by jury is demanded by the commissioners or by one or more interested parties, then the court shall submit to the jury all questions as to benefits and damages to any and all lands and property, even though a demand for a jury has not been made by all of the parties interested.
If any lands or property are sought to be taken by the exercise of the right of eminent domain, then the compensation to be paid for any lands or property so sought to be taken shall be fixed by a jury, unless a waiver of a trial by jury has been filed by each owner of land or property sought to be taken.
If a trial by jury is to be held, the jury may be drawn and summoned in the manner now or hereafter provided for the drawing and summoning of juries for the circuit court. If the jury is not summoned as above provided, then the court may, when the cause is set for trial, direct the clerk of the court to issue a venire for not less than 12 nor more than 24 competent jurors, as the court shall direct, and deliver the same to the sheriff or coroner, who shall summon such jurors from the body of the county to appear before the court at the time set for trial. The jury shall be impaneled, and the parties shall be entitled to challenge jurors as in other civil cases.
70 ILCS 605/5-7