Cal. Gov. Code § 53314

The legislative body may from time to time transfer moneys to a community facilities district or to an improvement area within a community facilities district, for the benefit of the district or improvement area, from any funds available to the legislative body. Any moneys so transferred may be used for the payment of any currently payable expenses incurred by reason of the construction or acquisition of any facilities or provision of any authorized services within the district or improvement area prior to December 1 of the first fiscal year in which a special tax may be levied for the facilities or services within the district or improvement area. The rate of interest earned by the investment of those moneys shall be determined by the legislative body.