315 ILCS 20/27
In the discharge of its functions and duties set forth in this Act, the Redevelopment Commission shall have general supervision of all Neighborhood Redevelopment Corporations, the Development Areas of which are located within the city, village or incorporated town which has created the Redevelopment Commission, and the Redevelopment Commission shall have power to hold investigations, inquiries and hearings concerning the affairs of those Neighborhood Redevelopment Corporations, concerning their dealings, transactions and relationships with third persons, and concerning any other matters covered by the provisions of this Act. In the conduct of any investigation, inquiry or hearing the Redevelopment Commission shall not be bound by the technical rules of evidence and no informality in any proceeding or in the manner of taking testimony before the Redevelopment Commission shall invalidate any order, decision, rule or regulation there made. All hearings shall be open to the public.
The Redevelopment Commission shall have the power to administer oaths and affirmations, certify to all official acts, issue subpoenas, compel attendance and testimony of witnesses and the production of papers, books, accounts and documents.
Hearings shall be held by the Redevelopment Commission. All evidence presented at hearings shall become a part of the records of the Redevelopment Commission. In all cases in which the Redevelopment Commission bases any action on reports of investigations or inquiries not conducted as hearings, those reports shall be made a part of the records of the Redevelopment Commission.
All records of the Redevelopment Commission shall be open to the inspection of all persons without reward. The Redevelopment Commission shall have the power to examine all books, contracts, records, documents and papers of a Neighborhood Redevelopment Corporation and by subpoena duces tecum compel the production thereof.
The Redevelopment Commission shall have power to adopt reasonable and proper administrative rules and regulations relating to the exercise of its powers, and proper administrative rules to govern its proceedings and to regulate the mode and manner of all investigations, inquiries and hearings and to alter and amend the same.
315 ILCS 20/27