California Code, Education Code - EDC § 17049

(a) The board shall require, as a condition of providing funding for any project under this chapter, that, for any facilities for kindergarten or any of grades 1 to 12, inclusive, or for any facilities for special education or continuation high school purposes, at least 30 percent of allowable new building construction for classrooms under the project be utilized for relocatable structures.

(b) The board may reduce the percentage requirement set forth in subdivision (a), as to any applicant, in the event that the quantity of relocatable structures necessary to comply with those requirements is unavailable from the manufacturers of those structures.

(c) The board may reduce or eliminate the percentage requirements set forth in subdivision (a), as to any applicant, under either of the following circumstances:

(d) Relocatable structures acquired by an applicant school district up to two years preceding the final approval by the board of the project application submitted by the district shall apply to the percentage requirements set forth in subdivision (a).

(e) Notwithstanding subdivision (d), relocatable structures acquired by an applicant school district up to 10 years preceding the final approval by the board of the project application submitted by the district shall apply to the percentage requirements set forth in subdivision (a) if the relocatable structures are to be situated on the site of a new school to be constructed under the project and all of the following conditions are met:

(f) Whenever at least 10 percent of the allowable new building construction contained in an application is to be utilized for relocatable structures, an additional three square feet of building area for each pupil to be housed under the approved project shall be allowed.