S.D. Codified Laws § 55-3-26
Current with legislation signed by the governor on or before 3/6/2024
On petition by a trustee or beneficiary, the court may modify the administrative or dispositive terms of the trust or terminate the trust if, because of circumstances not anticipated by the trustor, modification or termination of the trust would substantially further the trustor's purposes in creating the trust. Upon termination of a trust under this section, the trust property shall be distributed in accordance with the trustor's probable intention.
SDCL 55-3-26