California Code, Revenue and Taxation Code - RTC § 197

(a) “Eligible county” means a county which meets both of the following requirements:

(b) “Eligible property” means real property and any manufactured home, including any new construction which was completed or any change in ownership which occurred prior to October 17, 1989, which meets both of the following requirements:

(c) “Substantial disaster damage,” as to real property located in a county declared to be a disaster by the Governor as a result of the earthquake and aftershocks occurring in October 1989, means, with respect to real property and any manufactured home which has received the homeowners' exemption or is eligible for the exemption as of March 1, 1989, damage amounting to at least 10 percent of its fair market value or five thousand dollars ($5,000), whichever is less;  and, with respect to other property, damage to the parcel of at least 20 percent of its fair market value immediately preceding the disaster causing the damage.

(d) “Fair market value” means “full cash value” or “fair market value” as defined in Section 110.

(e) “Property tax deferral claim” means a claim filed by the owner of eligible property in conjunction with or in addition to the filing of an application for reassessment of that property pursuant to Section 170, which enables the owner to defer payment of the December 10, 1989, installment of taxes on property on the regular secured roll for the 1989-90 fiscal year, as provided in Section 197.1, or to defer payment of taxes on property on the supplemental roll for the 1989-90 fiscal year, as provided in Section 197.9.