California Code, Education Code - EDC § 17071.30

(a) Portable classrooms leased pursuant to Chapter 14 (commencing with Section 17085) shall be excluded from the existing school building capacity.  Portable classrooms obtained by an applicant district pursuant to subdivision (b) of Section 17088.5 shall be excluded from the existing school building capacity, except as to any portable classroom or classrooms for which the district rejected the board's offer to purchase pursuant to that subdivision.  Portable classrooms leased for a period of less than five years prior to the date of application shall not be included in existing school building capacity.

(b) The number of portable classrooms, reduced by the number of portable classrooms used as interim housing for modernization projects, that exceed 25 percent of the number of permanent classrooms available to the district shall not be included in the existing building capacity.