Cal. Educ. Code § 16046

Any building area excluded from the computation of adequate school building construction by adjustments made under Section 16045 shall not be subsequently included in computing the area of adequate school construction by reason of its having been converted to usable instructional area used exclusively for vocational educational programs, provided the conversion was accomplished with federal or district funds, allocated specifically for that purpose, other than state apportionment funds or bond funds required to be contributed to the State School Building Aid Program.