S.D. Codified Laws § 21-48-12

If the mortgaged premises consist of distinct farms, tracts, or lots, they must be sold separately, unless the same consist of platted lots having a structure partly upon each, in which case the lots must be sold as one tract; provided that whenever there be a paramount lien upon two or more lots or parcels of land not contiguous which paramount lien covers two or more of such separate lots or parcels, the separate lots or parcels may be sold in one parcel subject to such paramount lien. Except as are hereinbefore provided, no more farms, tracts, or lots must be sold than shall be necessary to satisfy the amount due on such mortgage at the date of the notice of sale, with interest, and the costs and expenses allowed by law.