S.D. Codified Laws § 50-7-4
Any lands acquired, owned, controlled, or occupied by a governmental agency for the purposes enumerated in § 50-7-3 shall and are hereby declared to be acquired, owned, controlled, and occupied for a public purpose and as a matter of public necessity. The governmental agency has the right to acquire public or private real property for such purposes by purchase from the owner if agreement on the terms can be made and if not by condemnation in the manner provided by law under which the governmental agency is authorized to acquire real property for public purposes. If there be no such law, in the manner provided generally for the condemnation of property for public use, the governmental agency has the right to exchange lands owned by the governmental agency for other lands of like character and value within the county or an abutting county whether privately owned or owned by the United States, the State of South Dakota, or any of its political subdivisions. The exchange shall be authorized by resolution of the governing body directing the execution of the necessary conveyance or conveyances. Any conveyance shall be signed by the presiding officer of the governing body and attested by the auditor or clerk.
SDCL 50-7-4