65 ILCS 5/11-67-9
Every municipality owning and operating such a municipal coliseum shall keep books of account for the coliseum 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 coliseum without charge, as nearly as possible, the value of that service, and also the value of any use or service rendered by the municipal coliseum 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 that property if owned by a private corporation. The corporate authorities shall have printed annually for public distribution, a report showing the financial results, in the form specified in this section, of the municipal ownership and operation.
The accounts of the municipal coliseum 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 coliseum, as the corporate authorities may prescribe.
65 ILCS 5/11-67-9