(A) The city shall respond to a request for records to be used for a commercial purpose within 21 working days after receipt. The response shall:
(1) Provide to the requester an estimate of the time required by the city to provide the records requested and an estimate of the fees to be charged, which the city may require the person to pay in full before copying the requested documents;
(2) Deny the request pursuant to one or more of the exemptions set out in 5 ILCS 140;
(3) 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
(4) Provide the records requested.
(B) Unless the records are exempt from disclosure, the city shall comply with a request within a reasonable period considering the size and complexity of the request, and giving priority to records requested for noncommercial 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 city.
(5 ILCS 140/3.1)