Cal. Educ. Code § 16573

If on June 30th of the fiscal year in which the state project is completed there is classroom space constructed with funds apportioned under this chapter, that is not being used by the district, the board shall, upon application of the district, reduce the total amount to be repaid by the district on a proportionate basis until the time that the classroom space is used by the district. No payment shall be required by the district for the period during which the classroom space is not used by the district.