Mo. Rev. Stat. § 204.662
Current with changes from the 2023 Legislative Session
No suit to set aside the assessments made under sections 204.680 to 204.730*, or to otherwise question the validity of the proceedings, shall be brought after the expiration of ninety days from the date the notice is mailed to the last known owners of record of the assessments required by subsection 3 of section 204.660.
§ 204.662, RSMo