Illinois Statutes Chapter 50. Local Government § 510/4. Public notice

(1) mail or e-mail a notice requesting a statement of interest in the specific project to all firms who have a current statement of qualifications and performance data on file with the political subdivision;

(2) place an advertisement in a secular English language daily newspaper of general circulation throughout such political subdivision, requesting a statement of interest in the specific project and further requesting statements of qualifications and performance data from those firms which do not have such a statement on file with the political subdivision. Such advertisement shall state the day, hour and place the statement of interest and the statements of qualifications and performance data shall be due; or

(3) place an advertisement for professional services on the political subdivision's website requesting a statement of interest in the specific project. The professional services advertisement shall include a description of each project and state the time and place for interested firms to submit its letter of interest, statement of qualifications, and performance data, as required.