Notwithstanding the provisions of this

article or any other provisions of law, when a nonpartisan charitable organization organized under the laws of this state has constructed or will construct, subject to the provisions of

Article 3 (commencing with

Section 39140) of

Chapter of this part, a school athletic and youth center facility at no cost to a school district, upon a school-district-owned site to be owned by and for the benefit of the school occupying the site, the governing board of the school district, in accepting the donation and prescribing the conditions and restrictions with respect thereto, may permit the general use of the facility under the provisions of this

article for specified supervised recreational activities which are sponsored by or conducted by the donor organization, and may also permit the donor organization to use the facility for this purpose at times when the facility is not being used by the school district for the educational program and related school activities of the designated beneficiary school, unless the use and occupancy of the facility by the donor organization would otherwise interfere with the regular conduct of the school.

Any use granted to the donor organization shall, however, immediately and forever terminate if the donor organization denies the use of the facility to any person because of their race, religion, creed, national origin, ancestry, or sex. This

section shall apply only to elementary school districts in San Diego County which had an average daily attendance of or less during the 1970–71 school year, and which, during the 1970–71 school year, had a modified assessed valuation per pupil in average daily attendance of between forty-five thousand dollars ($45,000) and fifty thousand dollars ($50,000).