65 ILCS 5/9-3-15
The assessment roll as returned by the officers making the same shall be prima facie evidence of the correctness of the amount assessed against each lot, tract or parcel of real estate, but shall not be counted as testimony of any witness or witnesses in the cause. If it is objected on the part of any property assessed for improvement that it will not be benefited thereby to the amount assessed thereon, and that it is assessed more than its proportionate share of the cost of such improvement, and a jury is not waived by agreement of parties, the court shall impanel a jury to try the issue, and in such case, except as otherwise ordered by the court, all such objections shall be tried and disposed of before a jury. Such assessment roll may be submitted to the jury and may be taken into a jury room by the jury when it retires to deliberate on its verdict. Either party may introduce such other evidence that may bear on the issues. The hearing shall be conducted as in other cases at law and if it shall appear that the premises of any objector are assessed more than such premises will be benefited by such improvement, or more than its proportionate share of the cost of such improvement, the jury shall so find, and shall also find the amount for which the premises ought to be assessed, and the judgment shall be rendered accordingly.
65 ILCS 5/9-3-15