Ed. Code, § 17499

(a) No more than 30 percent of the total surplus school acreage owned by a school district may be purchased or leased by public agencies pursuant to this article.

(b) The right of any public agency to purchase or lease surplus school property pursuant to this article shall exist only with respect to an amount of surplus school acreage within its jurisdictional boundaries which, when added to the surplus school acreage within its jurisdictional boundaries already purchased or leased pursuant to this article, will not exceed 30 percent of the surplus school acreage owned by the school district which is within the jurisdictional boundaries of that agency.

(c) For purposes of this section, “surplus school acreage” of a school district means property which is owned by a district and not used for school purposes, including, but not limited to, undeveloped property and property which contains school buildings that are not in use as a result of a school closure and which is not subject to any lease or agreement executed on or before July 1, 1974, for a term in excess of six years, in which any city containing a population of less than 100,000 had use of the property for park purposes on January 1, 1981, and had improved the property.

(d) Nothing in this section shall be construed to deny local agencies the opportunity to purchase at full market value all or part of the 70 percent of the total surplus school acreage which is not affected by this article.