Mo. Rev. Stat. § 447.622: Petition, requirements.

Any organization may petition to have property declared abandoned pursuant to the provisions of sections 447.620 to 447.640 and for temporary possession of such property, if:

(1) The property has been continuously unoccupied by persons legally entitled to possession for at least six months prior to the filing of the petition;

(2) The taxes are delinquent on the property;

(3) The property is a nuisance; and

(4) The organization intends to rehabilitate the property.