Owner may pay whole tax in one sum; county commissioners may make new assessments where former assessments found illegal; time in which assessments may be questioned in collateral proceedings.

Any person owning lands assessed for the purposes hereinbefore specified, may, at any time, pay in full the total amount assessed against his or her property and obtain a release therefrom from the board of county commissioners, and the same shall be entered upon the minutes of the board of county commissioners, and the board of county commissioners shall instruct the property appraiser to thereafter omit the said property, so released, from further assessment for said purpose. In the event any of the assessments herein provided for shall be found to be irregular or illegal, the said board of county commissioners may make new and other assessments in accordance with the provisions of this chapter, correcting such irregularities, until the owners of the land assessed shall have paid the amount for which they are properly assessable; and in no case shall the validity of any assessment be questioned in any direct or collateral proceedings brought more than 3 months after the report of the committee assessing the lands benefited shall be filed with the board of county commissioners and equalized and approved by said board.