South Dakota Codified Laws
Chapter 05 - Offer Of Performance Of Obligations
Section 20-5-9 - Offer to be free from conditions.

20-5-9. Offer to be free from conditions.
An offer of performance must be free from any condition which the creditor is not bound on his part to perform.

Source: CivC 1877, §843; CL 1887, §3467; RCivC 1903, §1160; RC 1919, §767; SDC 1939, §47.0217.