Section 12.15 Validity of Assessment Roll.
   Upon the completion of the roll and from and after midnight ending the last day of the meeting of the Board of Review, the same shall be the assessment roll of the City for County, school, and City taxes on real and personal property that may be authorized by law, and shall be conclusively presumed by all courts and tribunals to be valid and shall not be set aside except for causes set forth in the general laws of the State.