70 ILCS 1870/6
All leases or other contracts for operation of any public warehouse or public grain elevator or transportation facilities owned or otherwise controlled by the Port District shall be governed by the following procedure: Notice shall be given by the Port District that bids will be received for the operation of such public warehouse or public grain elevator or transportation facilities. This notice shall state the time within which and the place where bids may be submitted, the time and place of opening bids, and shall be published not more than 30 days nor less than 15 days in advance of the first day for the submission of bids in one or more newspapers designated by the Port District published and having a general circulation within the Port District; this notice shall include sufficient data for the proposed operation to enable bidders to understand the scope and nature of the operation; except that contracts which by their nature are not adapted to award by competitive bidding, such as contracts for the services of individuals possessing a high degree of personal skill, contracts for the purchase or binding of magazines, books, periodicals, pamphlets, reports and similar articles, and contracts for utility services such as water, light, heat, telephone or telegraph, are not subject to the competitive bidding requirements of this Section.
70 ILCS 1870/6