620 ILCS 75/2-85
If the public-private agreement provides for the construction of all or part of the South Suburban Airport project and the estimated construction costs under the public-private agreement exceed $50,000,000, the Department shall also require the contractor to pay the costs for an independent audit of any and all cost estimates associated with the public-private agreement as well as a review of all public costs and potential liabilities to which taxpayers could be exposed (including improvements to other transportation facilities that may be needed as a result of the public-private agreement, failure by the contractor to reimburse the Department for services provided, and potential risk and liability in the event of default on the agreement or default on other types of financing). The independent audit shall be conducted by an independent consultant selected by the Department.
620 ILCS 75/2-85