Cal. Health & Saf. Code § 50742
For purposes of acting as a local finance entity pursuant to this chapter, a city, county, or city and county may, pursuant to an enabling ordinance of its legislative body, issue revenue bonds to provide below-market interest financing of a rental housing development. Any city, county, or city and county may act jointly with one or more other cities, counties, or cities and counties in the exercise of powers under this section. The proceeds of local revenue bonds issued pursuant to this section shall be used solely to finance rental housing developments containing assisted units, for any and all costs of administering such finance program and for complying with mandated reserve requirements. Any interest or other increment received by a local finance entity acting under the authority of this section from the investment or reinvestment of the proceeds of such revenue bonds, any payments of principal or interest on financing provided by the local finance entity or part of such program, and any other revenues received by the local finance entity in connection with, or for purposes of, such program shall be held and applied solely for the purposes of such program.
Ca. Health and Saf. Code § 50742