(a) This act applies to any interest created after its effective date which complies with this act, whether designated as a conservation easement or as a covenant, equitable servitude, restriction, easement or otherwise.
(b) This act applies to any interest created before its effective date if it would have been enforceable had it been created after its effective date unless retroactive application contravenes the constitution or laws of this state or the United States.
(c) This act does 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.