Mo. Rev. Stat. § 88.747

It shall be the duty of the county commission whenever any of the improvements of the property set out in section 88.743 is required by ordinance, to forthwith make such improvement fronting or abutting any real estate owned by the county and lying within the corporate limits of the city, and included in the terms of the ordinance, in compliance with the provisions of such ordinance, and pay for such improvements out of the general fund of the county.