A court may reasonably reduce the amount of the property transferred to the trustee of a purpose trust if the court determines that the trust corpus substantially exceeds the amount required for the intended purposes. The court should consider allowing the trust to be administered for a reasonable period of time before undertaking a determination. The amount of the reduction, if any, passes as unexpended trust property, as set forth in § 55-1-21.8.
SDCL 55-1-21.2