S.D. Codified Laws § 21-48-22.1
All mortgage foreclosure sales of real property by advertisement, under power of sale contained in such mortgages, made before January 1, 1992, the sheriff's deed thereof having been executed and delivered to the purchaser of such real property before January 1, 1975, notwithstanding any defect of notice, acknowledgment of any instrument or the recording thereof, or any other defect in the proceeding, are hereby cured, legalized, and validated as fully as if such foreclosure proceedings had been made in full compliance with all existing statutes or laws.
If any person has any vested right in any real property by reason of any omission referred to in this section, and if no action or proceeding to enforce such right was commenced prior to July 1, 1993, such right shall be forever barred. No action or proceeding brought involving real property shall be of any force or effect, or maintainable in any court of this state, unless prior to July 1, 1993, there was recorded in the office of the register of deeds of the county in which the real property affected is situated, a notice of the pendency of such action, in accordance with chapter 15-10.
SDCL 21-48-22.1