Cal. Rev. & Tax. Code § 205.1
Section 205 of this code fulfills the intent of subdivisions (o), (p), (q), and (r) of Section 3 of Article XIII of the Constitution. To further carry out the intent of subdivisions (o), (p), (q), and (r) of Section 3 of Article XIII of the Constitution, if the assessment ratio is increased from 25 percent to 100 percent the amount of assessed value subject to the exemption shall be increased from one thousand dollars ($1,000) to four thousand dollars ($4,000) in order to maintain the same proportionate value of the exemption. Whenever assessed value is used to determine eligibility for such exemption based on the limitations on the value of property owned, 25 percent of the assessed value shall be used when the assessment ratio is increased to 100 percent to maintain the same proportionate values of such property and such limitations.
Ca. Rev. and Tax. Code § 205.1