S.D. Codified Laws § 34A-5-33
The board of trustees of a sanitary district may sell and convey real property held by a sanitary district, the title to which has been obtained from any source, and which is not required for public purposes and has been or is about to be abandoned for public purposes. The sale and conveyance shall be conducted in accordance with chapter 6-13. In order to make the sale, the board of trustees may employ real estate agents and incur other necessary expenses.
Any real property which any sanitary district sells under the terms of this section shall first be offered for sale to the prior fee holder or the prior fee holder's heirs or assigns from whom the real property was originally purchased. The prior fee holder, heirs, and assigns have the right of first refusal to purchase the real property at its appraised value.
SDCL 34A-5-33