S.D. Codified Laws § 20-2-5
Current with legislation signed by the governor on or before 3/6/2024
Before any party to an obligation can require another party to perform any act under it, he must fulfill all conditions precedent thereto imposed upon himself; and must be able, and offer, to fulfill all conditions concurrent, so imposed upon him, on the like fulfillment by the other party, except as provided by § 20-2-6.
SDCL 20-2-5