Whenever unknown defendants owning or claiming an interest in special assessments are made parties defendant, the following persons shall also be made parties defendant: (a)The payee, as shown by the bond representing the special assessment, if any; (b)the owner of the special assessment, or any person claiming an interest therein, as shown by the treasurer’s records; and (c)the treasurer, as collecting agent and trustee of the funds collected for unknown owners of a special assessment or persons claiming an interest therein.