Section 9.4.  Contest of Assessment
No suit or action of any kind shall be instituted or maintained for the purpose of contesting or enjoining the collection of any special assessment or reassessment (a) unless, within 30 days after the confirmation of the special assessment roll, written notice is given to the City Clerk for attention of the City Commission indicating an intention to file such suit or action and stating the grounds on which it is claimed such assessment is illegal and (b) unless such suit or action shall be commenced within 60 days after the confirmation of the roll. If the City Attorney submits a written opinion finding said roll illegal, in whole or in part, the City Commission may revoke its confirmation, correct the illegality if possible, and re-confirm the same, provided that no property which is not involved in the illegality shall be assessed more than was imposed upon the original confirmation without further notice and hearing thereon.