S.D. Codified Laws § 44-1-6
Current with legislation signed by the governor on or before 3/6/2024
An agreement may be made to create a lien upon property not yet acquired by the party agreeing to give the lien, or not yet in existence. In such case the lien agreed for attaches from the time when the party agreeing to give it acquires an interest in the property and to the extent of such interest.
SDCL 44-1-6