California Code, Health and Safety Code - HSC § 18962

(a) For a development project in which a designated historical resource is being converted or adapted, a local agency shall provide the following reductions in required parking, unless otherwise required by a local historical preservation or adaptive reuse ordinance:

(b) A development project in which a designated historical resource is being converted or adapted that is eligible for reductions in required parking pursuant to this section shall comply with all federal, state, and local alternative regulations and standards necessary for the preservation, restoration, rehabilitation, safety, relocation, or continued use of the designated historical resource.

(c) For purposes of this section, “designated historical resource” means a structure or property officially designated on a local register of historical resources, the California Register of Historical Resources, or the National Register of Historic Places.