Mo. Rev. Stat. § 71.230: Unimproved additions, how vacated.

If any person shall lay off an addition to any town or city which he does not improve, and shall be the legal owner of all lots contained in such addition, such person, or any other person who shall become the legal owner thereof, shall have such addition or any part thereof vacated by applying to the county commission of the proper county, after notice as provided in section 71.240 and proof of ownership of such lots, but such act of vacation shall have no force or effect until a certificate thereof be made out by the clerk of the said commission and filed for record in the recorder's office of said county.