S.D. Codified Laws § 7-31-45
The board of county commissioners of any county in this state which has an area of two hundred fifty thousand acres or more in which five percent or more of the taxable land of said county has been acquired, or which is subject to acquisition by the county, through the foreclosure of school-loan mortgages or through tax-deed proceedings or other source, except lands owned and held by the county for public use, may, in their discretion and whenever they deem it in the best interests of the county, employ any necessary agent or agents to expedite the rental and sale of real property acquired by the county and to assist the county treasurer in instituting tax-deed proceedings against property upon which the county holds or may hereafter acquire tax sale certificates.
SDCL 7-31-45