(A) The county shall respond to a request for records to be used for a commercial purpose within 21 working days after receipt. The response shall (i) provide to the requester an estimate of the time required by the county to provide the records requested and an estimate of the fees to be charged, which the county may require the person to pay in full before copying the requested documents, (ii) deny the request pursuant to one or more of the exemptions set out in this chapter, (iii) notify the requester that the request is unduly burdensome and extend an opportunity to the requester to attempt to reduce the request to manageable proportions, or (iv) provide the records requested.
(B) Unless the records are exempt from disclosure, the county shall comply with a request within a reasonable period considering the size and complexity of the request, and giving priority to records requested for non-commercial purposes.
(C) It is a violation of this chapter for a person to knowingly obtain a public record for a commercial purpose without disclosing that it is for a commercial purpose, if requested to do so by the county.
(ILCS Ch. 5, Act 140, § 3.1)