California Code, Government Code - GOV § 65979

(a) One year after receipt of an apportionment pursuant to the Leroy F. Greene State School Building Lease-Purchase Law of 1976 (Chapter 12 (commencing with Section 17000 of Part 10 of the Education Code) for the construction of a school, the city or county shall not be permitted thereafter, pursuant to this chapter or pursuant to any other school facilities financing arrangement the district may have with builders of residential development, to levy any fee or to require the dedication of any land within the attendance area of the school for which the apportionment was received.  However, any time after receipt of the apportionment there may be a determination of overcrowding pursuant to Section 65971, if both of the following further findings are made:

(b) Any amounts of fees collected or land dedicated after the receipt of the construction apportionment and not used to avoid overcrowding shall be returned to the person who paid the fee or made the land dedication.