California Code, Business and Professions Code - BPC § 5493

(a) As an alternative to payment of fair and just compensation under Section 5492, a city or county may pay fair and just compensation to the owner of the on-premises advertising display by paying the actual replacement cost to the owner for an on-premises advertising display which shall conform with the laws in effect that are applicable to the owner's business premises, and shall include, as part of the actual replacement cost, the actual cost for removal of the nonconforming on-premises advertising display and the actual cost of the repair to the real property caused by the removal of the display.

(b) The sum payable as fair and just compensation to the owner of any on-premises advertising display shall be the greater of the two methods provided in subdivision (a) of this section or Section 5492 as the basis for fair and just compensation. In any event, before any on-premises advertising display is required to be removed, the fair and just compensation required by subdivision (a) of this section or Section 5492 shall be paid.