Mo. Rev. Stat. § 141.765
As a condition of the sale or other authorized conveyance of ownership of any unimproved parcel of land classified as residential property owned by the land trust to a private owner, (unless the owner owns an adjacent improved parcel) such owner may be required to enter into a contract with the land trust stipulating that such owner or his successor agree that the parcel of land shall, within three years of such sale, * either be improved by a nontemporary structure or returned to the land trust by special warranty deed. The contract shall further state that if the private owner fails to comply with the stipulation he shall be liable to the land trust for damages at the rate of one hundred dollars per month accruing on the first day of each month after the termination of the three-year period so long as the private owner fails to convey the parcel to the land trust. The performance of such agreement shall be secured by a deed of trust or other lien encumbering the parcel. If the land trust finds by resolution that the terms of the agreement have not been satisfied, the land trust shall be authorized to bring suit to recover damages for the breach and to redeem the ownership of such property without consideration or compensation by seeking a judicial foreclosure of such agreement pursuant to sections 443.190 to 443.260, except that upon final judgment of the court, title shall revert to the land trust without necessity of sale. Notwithstanding section 141.750, the original deed conveying title to the private owner shall contain a possibility of reverter upon the condition that the private owner fails to comply with the terms of the contract, with a right of reentry retained by the land trust. As an alternative to, or in addition to, seeking a judicial foreclosure, the land trust may exercise the right of reentry pursuant to chapter 524, chapter 527, or chapter 534. The land trust shall assume title to the land by filing a copy of the judgment with the recorder of deeds in the county where the property is located. Any property redeemed by the land trust under the provisions of this section shall be administered in the same manner as other property sold to the land trust.
§ 141.765, RSMo