Cal. Education Code § 17493

(a) No public agency may purchase surplus school property from a school district pursuant to this article unless it has first adopted a plan for the purchase of surplus school property. The plan shall designate the surplus site or sites all or a portion of which the public agency desires to purchase at the price established pursuant to this article and shall designate at least 70 percent of the total surplus school acreage as property which the agency does not desire to purchase at the price established pursuant to this article. Where the plan indicates that the agency desires to purchase only a portion of a schoolsite at the price established pursuant to this article, it shall designate the percent of the property to be so purchased and provide a description of the general location of the property to be purchased, without designating the metes and bounds. (b) Any property designated by public agencies as surplus schoolsites which the agencies do not wish to purchase, pursuant to subdivision (a), may be sold or leased by a school district without regard to this article. (c) This section shall become operative on April 1, 1982.