Mo. Rev. Stat. § 67.469
A special assessment authorized under the provisions of sections 67.453 to 67.475 shall be a lien, from the date of the assessment, on the property against which it is assessed on behalf of the city or county assessing the same to the same extent as a tax upon real property. The lien may be foreclosed in the same manner as a tax upon real property by land tax sale pursuant to chapter 140 or, if applicable to that county, chapter 141, or at the option of the governing body, by judicial foreclosure proceeding. Upon the foreclosure of any such lien, whether by land tax sale or by judicial foreclosure proceeding, the entire remaining assessment may become due and payable and may be recoverable in such foreclosure proceeding at the option of the governing body.
§ 67.469, RSMo