California Code, Health and Safety Code - HSC § 18954

Repairs, alterations, and additions necessary for the preservation, restoration, rehabilitation, moving, or continued use of a qualified historical building or structure may be made if they conform to this part. The building department of every city or county or other local agency that has jurisdiction over the enforcement of code within its legal authority shall apply the alternative standards and regulations adopted pursuant to Section 18959.5 in permitting repairs, alterations, and additions necessary for the preservation, restoration, rehabilitation, safety, moving, or continued use of a qualified historical building or structure. A state agency shall apply the alternative regulations adopted pursuant to Section 18959.5 in permitting repairs, alterations, and additions necessary for the preservation, restoration, rehabilitation, safety, moving, or continued use of a qualified historical building or structure.

The application of any alternative standards for the provision of access to the disabled or exemption from access requirements shall be done on a case-by-case and item-by-item basis, and shall not be applied to an entire qualified historical building or structure without individual consideration of each item, and shall not be applied to related sites or areas except on an item-by-item basis.