Mo. Rev. Stat. § 82.440
No city amenable to the provisions of sections 82.420 and 82.430, now owning a public marketplace or public marketplaces, or which shall hereafter acquire a public marketplace, shall be permitted to disburse or use for other purposes any of the proceeds received from the sale or disposition of such marketplace or marketplaces, unless such said city shall have, prior thereto, acquired the necessary ground for the establishment of a marketplace or marketplaces, as contemplated in said sections 82.420 and 82.430, and which ground shall be of dimensions commensurate with the requirements of said city, and not to exceed in cost the sum of one million dollars, and unless said city shall, prior thereto, have made provisions for the establishment and maintenance of a marketplace or marketplaces on such grounds, as is contemplated in sections 82.420 and 82.430.
§ 82.440, RSMo