California Code, Education Code - EDC § 45243.5

Notwithstanding Section 45243, in the case of a unified district and a community college district which are under the jurisdiction of governing boards of identical personnel and which had a majority of their population within an incorporated city which had a population between 70,000 and 75,000 as of the 1950 census, the governing board may, by affirmative vote of the majority of its members, elect to make the provisions of this article applicable to each of the districts individually and separately. In such cases, the expenses of the commission shall be paid out of general funds of the districts in proportion to the benefits derived therefrom as determined by the governing board.

In the case of action by the governing board to make the provisions of this article applicable to each of the districts individually and separately, and notwithstanding any other provision of law, the rights of persons employed in positions not requiring certification qualifications shall continue in the same manner as if such separation had not occurred, except that such rights shall be limited to the district in which the person is employed on the day such action is taken by the governing board. For purposes of determining seniority, employment shall be deemed to have commenced as of the date of original employment in either the unified district or the community college district.