When territory is proposed to be disconnected by court order under this Article, the corporate authorities or petitioners initiating the action shall notify each person who pays real estate taxes on property within that territory unless the person is a petitioner. The notice shall be served by certified or registered mail, return receipt requested, at least 20 days before a court hearing or other court action. If the person who pays real estate taxes on the property is not the owner of record, then the payor shall notify the owner of record of the proposed disconnection.