In applying this subdivision, the base year value of the subject real property does not include that portion of the previous base year value of that property that was attributable to any portion of the property that has been destroyed or removed. The sum determined under this subdivision shall then become the base year value of the real property until that property is restored, repaired, or reconstructed or other provisions of law require establishment of a new base year value.
Ca. Rev. and Tax. Code § 51