Cal. Education Code § 41018

The governing board of any school district or any county office of education having an average daily attendance of 100,000 or more may deposit in one or more bank accounts moneys received from the temporary rental of property acquired by a school district or county office of education pending construction of school facilities on the property. The moneys may be held in the accounts for a period of not to exceed three years and may be used to pay any proper costs incurred as a result of the temporary rental, provided that when the moneys are not being used to pay the costs they may be invested, along with all other moneys deposited in clearing accounts, pursuant to Section 41015 as determined by the governing board of the school district or the county office of education. The moneys invested pursuant to this section shall be invested with the care, skill, prudence, and diligence under the circumstances then prevailing that a prudent person acting in a like capacity and familiar with these matters would use in the conduct of an enterprise of like character and with like aims.