Cal. Educ. Code § 16094

Interest earned on those portions of deposits in a state school building fund representing allocations from the proceeds of state school construction bonds received by the county treasurer for the benefit of a school district under this chapter shall be paid into the state school building fund created by Section 16093. The interest which prior to the 1964–65 fiscal year was deposited in the general fund of the school district for which the state school building fund was established shall remain the property of that general fund.