Cal. EDC § 17626

(a) A fee, charge, dedication, or other requirement authorized under Section 17620, whether or not allowable under Chapter 6 (commencing with Section 66010) of Division 1 of Title 7 of the Government Code, may not be applied to the reconstruction of any residential, commercial, or industrial structure that is damaged or destroyed as a result of a disaster, except to the extent the square footage of the reconstructed structure exceeds the square footage of the structure that was damaged or destroyed. That square footage comparison shall be made, in the case of a commercial or industrial structure, on the basis of chargeable covered and enclosed space, as defined in Section 65995 of the Government Code, or, in the case of a residential structure, on the basis of assessable space, as defined in Section 65995 of the Government Code.

(b) The following definitions apply for the purposes of this section:

(1) “Disaster” means a fire, earthquake, landslide, mudslide, flood, tidal wave, or other unforeseen event that produces material damage or loss.

(2) “Reconstruction” means the construction of property that replaces, and is equivalent in kind to, the damaged or destroyed property.