315 ILCS 20/5
Consistent with the provisions of this Act, the Redevelopment Commission may adopt such rules and regulations and may alter, amend and repeal the same as it shall deem advisable relative to the calling, holding and conduct of its meetings, the transaction of its business, the regulation and control of its employees, the conduct of hearings, inquiries and investigations, and the performance in general of its duties and powers hereunder.
A majority of the members of the Redevelopment Commission shall constitute a quorum to transact business and no vacancy shall impair the right of the remaining members to exercise all its powers; and every order, rule or regulation of the Redevelopment Commission approved by a majority of the members thereof shall be deemed to be the order, rule or regulation of the Redevelopment Commission.
The Redevelopment Commission may adopt, keep, and use a common seal, of which judicial notice shall be taken in all courts of this State. Any notice, instrument or document which the Redevelopment Commission may be authorized by law to issue shall be deemed sufficient if signed by its secretary and authenticated by such seal. All orders, rules, regulations and records of the Redevelopment Commission, and all instruments or documents filed with it may be proved in any court of this State by a copy thereof certified by the secretary under the seal of the Redevelopment Commission.
315 ILCS 20/5