S.D. Codified Laws § 21-51-2
The circuit court for any county in which a mortgage or other lien is filed or recorded or in which any real estate under contract or bond for purchase or sale is located, may, on application of any person having an interest in or lien upon the property affected and notice as hereinafter provided, make an order discharging such contract, bond, mortgage, or lien of record, on proof to the satisfaction of the court that the mortgage or lien has been fully paid or satisfied, and that the mortgagee, assignee, or lien holder is deceased and has no acting representative of his estate in this state or, if a domestic corporation, that it has been dissolved and has no acting officer, trustee, or receiver of its property or, if a foreign corporation that it has not complied with the laws of this state applying to foreign corporations and has no one in this state upon whom service can be made as provided by law.
In the case of real estate subject to a contract or bond for sale or purchase of the same, the proof must show that the conditions prescribed by § 21-51-1 exist.
SDCL 21-51-2