Cal. Rev. & Tax. Code § 170
(a) Notwithstanding any other law, the board of supervisors, by ordinance, may provide that every assessee of any taxable property, or any person liable for the taxes thereon, whose property was damaged or destroyed without the assessee’s or liable person’s fault, may apply for reassessment of that property as provided in this section. The ordinance may also specify that the assessor shall have the discretion to determine the appropriate date of damage and may initiate the reassessment where the assessor determines that within the preceding 12 months taxable property located in the county was damaged or destroyed.
(3) A misfortune or calamity that, with respect to a possessory interest in land owned by the state or federal government, has caused the permit or other right to enter upon the land to be suspended or restricted. As used in this paragraph, “misfortune or calamity” includes a drought condition such as existed in this state in 1976 and 1977.
The application for reassessment may be filed within the time specified in the ordinance or within 12 months of the misfortune or calamity, whichever is later, by delivering to the assessor a written application requesting reassessment showing the condition and value, if any, of the property immediately after the damage or destruction, and the dollar amount of the damage. The application shall be executed under penalty of perjury, or if executed outside the State of California, verified by affidavit.
An ordinance may be made applicable to a major misfortune or calamity specified in paragraph (1) or to any misfortune or calamity specified in paragraph (2), or to both, as the board of supervisors determines. An ordinance shall not be made applicable to a misfortune or calamity specified in paragraph (3), unless an ordinance making paragraph (2) applicable is operative in the county. The ordinance may specify a period of time within which the ordinance shall be effective, and, if no period of time is specified, it shall remain in effect until repealed.
To be eligible for reassessment the damage or destruction to the property shall have been caused by any of the following:
(c)
(d)
(g) The assessed value of the property in its damaged condition, as determined pursuant to subdivision (b) compounded annually by the inflation factor specified in subdivision (a) of Section 51, shall be the taxable value of the property until it is restored, repaired, reconstructed or other provisions of the law require the establishment of a new base year value.
If partial reconstruction, restoration, or repair has occurred on any subsequent lien date, the taxable value shall be increased by an amount determined by multiplying the difference between its factored base year value immediately before the calamity and its assessed value in its damaged condition by the percentage of the repair, reconstruction, or restoration completed on that lien date.
(h)
(1) When the property is fully repaired, restored, or reconstructed, the assessor shall make an additional assessment or assessments in accordance with subparagraph (A) or (B) upon completion of the repair, restoration, or reconstruction: