Cal. Const. art. XIII A, § 1

(a) The maximum amount of any ad valorem tax on real property shall not exceed One percent (1%) of the full cash value of such property. The one percent (1%) tax to be collected by the counties and apportioned according to law to the districts within the counties.
(b) The limitation provided for in subdivision (a) shall not apply to ad valorem taxes or special assessments to pay the interest and redemption charges on any of the following:
1. (1) Indebtedness approved by the voters prior to July 1, 1978.
2. (2) Bonded indebtedness for the acquisition or improvement of real property approved on or after July 1, 1978, by two-thirds of the votes cast by the voters voting on the proposition.
3. (3) Bonded indebtedness incurred by a school district, community college district, or county office of education for the construction, reconstruction, rehabilitation, or replacement of school facilities, including the furnishing and equipping of school facilities, or the acquisition or lease of real property for school facilities, approved by 55 percent of the voters of the district or county, as appropriate, voting on the proposition on or after the effective date of the measure adding this paragraph. This paragraph shall apply only if the proposition approved by the voters and resulting in the bonded indebtedness includes all of the following accountability requirements:
  1. (A) A requirement that the proceeds from the sale of the bonds be used only for the purposes specified in Article XIII A, Section 1(b)(3), and not for any other purpose, including teacher and administrator salaries and other school operating expenses.
  2. (B) A list of the specific school facilities projects to be funded and certification that the school district board, community college board, or county office of education has evaluated safety, class size reduction, and information technology needs in developing that list.
  3. (C) A requirement that the school district board, community college board, or county office of education conduct an annual, independent performance audit to ensure that the funds have been expended only on the specific projects listed.
  4. (D) A requirement that the school district board, community college board, or county office of education conduct an annual, independent financial audit of the proceeds from the sale of the bonds until all of those proceeds have been expended for the school facilities projects.
(c) Notwithstanding any other provisions of law or of this Constitution, school districts, community college districts, and county offices of education may levy a 55 percent vote ad valorem tax pursuant to subdivision (b).