S.D. Codified Laws § 1-19B-60
The provisions of §§ 1-19B-56 to 1-19B-60, inclusive, apply to any interest created after July 1, 1984, which complies with §§ 1-19B-56 to 1-19B-60, inclusive, whether designated as a conservation easement or as a covenant, equitable servitude, restriction, easement, or otherwise. The provisions of §§ 1-19B-56 to 1-19B-60, inclusive, apply to any interest created before July 1, 1984, if it would have been enforceable had it been created after July 1, 1984, unless retroactive application contravenes the Constitution or laws of this state or the United States. The provisions of §§ 1-19B-56 to 1-19B-60, inclusive, do not invalidate any interest, whether designated as a conservation or preservation easement or as a covenant, equitable servitude, restriction, easement, or otherwise, that is enforceable under other law of this state.
SDCL 1-19B-60