Mo. Rev. Stat. § 141.080: Recovery of taxes, when.

No action for recovery of taxes against real estate shall be commenced, had or maintained, unless action therefor shall be commenced within three years after delinquency, except that such three-year limitation shall not be applicable if any entity conveys any real estate having a tax-exempt status, and such conveyance causes such real estate to again become taxable real property and such conveyance has not been recorded in the office of the recorder in the county in which the real estate is situated. Such three-year limitation shall only be applicable upon the date such conveyance is recorded in the deed records of the county in which the real estate is situated.