California Code, Public Resources Code - PRC § 5862

(a) Designation of property by the director as a California natural landmark does not change the property's ownership and does not dictate activity.

(b) Designation as a California natural landmark does not require, mandate, or authorize, under state law, any further state or local planning, zoning, or other land-use action or decision.

(c) An owner who agrees to have his or her property designated as a California natural landmark does not give up without his or her consent, under state law, any legal rights and privileges of ownership or use of the property.

(d) The department does not gain a property interest in a California natural landmark by virtue of that designation.