65 ILCS 5/11-65-9
Every municipality owning and operating such a municipal convention hall shall keep books of account for the municipal convention hall separate and distinct from other municipal accounts and in such manner as to show the true and complete financial standing and results of the municipal ownership and operation. These accounts shall be so kept as to show: (1) the actual cost to the municipality of maintenance, extension, and improvement, (2) all operating expenses of every description, (3) if water or other service is furnished for the use of the municipal convention hall without charge, as nearly as possible, the value of that service, and also the value of any use or service rendered by the municipal convention hall to the municipality without charge, (4) reasonable allowances for interest, depreciation, and insurance, and (5) estimates of the amount of taxes that would be chargeable against the property if owned by a private corporation. The corporate authorities shall publish a report annually showing the financial results, in the form specified in this section, of the municipal ownership and operation in one or more newspapers published in the municipality, or, if no newspaper is published therein, then in one or more newspapers with a general circulation within the municipality.
The accounts of the convention hall shall be examined at least once a year by a licensed Certified Public Accountant permitted to perform audits under the Illinois Public Accounting Act who shall report to the corporate authorities the results of his examination. This accountant shall be selected as the corporate authorities may direct, and he shall receive for his services such compensation, to be paid out of the revenue from the municipal convention hall, as the corporate authorities may prescribe.
65 ILCS 5/11-65-9