Cal. Public Resources Code § 5024.5

(a) No state agency shall alter the original or significant historical features or fabric, or transfer, relocate, or demolish historical resources on the master list maintained pursuant to subdivision (d) of Section 5024 without, early in the planning processes, first giving notice and a summary of the proposed action to the officer who shall have 30 days after receipt of the notice and summary for review and comment. (b) If the officer determines that a proposed action will have an adverse effect on a listed historical resource, the head of the state agency having jurisdiction over the historical resource and the officer shall adopt prudent and feasible measures that will eliminate or mitigate the adverse effects. The officer shall consult the State Historical Building Safety Board for advice when appropriate. (c) Each state agency shall maintain written documentation of the officer’s concurrence with proposed actions which would have an effect on an historical resource on the master list. (d) The officer shall report to the Office of Planning and Research for mediation instances of state agency refusal to propose, to consider, or to adopt prudent and feasible alternatives to eliminate or mitigate adverse effects on historical resources on the master list as specified in subdivision (f) of Section 5024. (e) The officer may monitor the implementation of proposed actions of any state agency. (f) Until such time as a structure is evaluated for possible inclusion in the inventory pursuant to subdivisions (b) and (c) of Section 5024, state agencies shall assure that any structure which might qualify for listing is not inadvertently transferred or unnecessarily altered. (g) The officer may provide local governments with information on methods to preserve their historical resources.