35 ILCS 200/16-50

The Board of review shall assess all omitted property as provided in Sections 9-265 and 9-270. An assessment of omitted property by the board of review in the manner provided in this Code shall not be subject to review by any succeeding board. For the purpose of enforcing the provisions of this Code, the several taxing bodies interested therein are hereby empowered to employ counsel to appear before the board and take all necessary steps to enforce the assessment on such omitted property.