Illinois Statutes Chapter 65. Municipalities § 5/8-4.1-4. Backdoor referendum

A. The corporate authorities may adopt an authorizing ordinance describing briefly the authority under which Bonds are proposed to be issued, the nature of the project or purpose to be financed, the estimated total costs of the project or purpose, including in such costs all items related to financing the project or purpose, and the maximum amount of Bonds authorized to be issued to pay such costs. No further details or specifications are required in such authorizing ordinance. Such authorizing ordinance, along with any other notice as required by Applicable Law, including any notice as to the right of electors to file a petition and the number of voters required to sign any such petition, shall be published or posted as required by Applicable Law. A petition may be filed after such publication or posting during the period as provided by Applicable Law; but upon the expiration of any such period, the corporate authorities shall be authorized to issue such Bonds as if they had followed all necessary procedures set forth in such Applicable Law.

B. If no petition meeting the requirements of the Applicable Law is filed during the petition period hereinabove referred to, then the corporate authorities may adopt additional ordinances or proceedings supplementing or amending the authorizing ordinance so long as the maximum amount of Bonds as set forth in the authorizing ordinance hereinabove provided for is not exceeded, and there is no material change in the project or purpose described in the authorizing ordinance. Such additional ordinances or proceedings shall in all instances become effective immediately without publication or posting or any further act or requirement. The authorizing ordinance, together with such additional ordinances or proceedings, shall constitute complete authority for the issuance of such Bonds under the Applicable Law.