Cal. Ed. Code § 17218
The governing board of a school district which has been included in a school district unification proposal approved by the electors of the territory involved pursuant to Chapter 2 (commencing with Section 4206) of Part 3, may, prior to the time the new unified school district becomes effective for all purposes, acquire a site for a school building at any place within the new unified school district, and upon the acquisition of the site it shall become a part of the district pending the date when the new unified school district becomes effective for all purposes. The site shall not be acquired until the county committee on school district organization of the county or of each of the counties concerned has received the proposal for acquisition of the site and reported its recommendations thereon to the governing boards of the districts concerned and to each county superintendent of schools concerned. The report of the county committee shall be made within 60 days from the time the proposal for acquisition of the site was submitted to it.
Ca. Educ. Code § 17218