Gov. Code, § 5809

All securities as defined in Section 5805, and all bonds, notes, warrants or other evidences of indebtedness of an issuer in an aggregate principal amount less than five hundred thousand dollars ($500,000), that are issued to finance a public project either by public leaseback or by any lease between a public body as lessee and an issuer as lessor executed after the public project is acquired, constructed or completed and the interest thereon or income therefrom are exempt from all taxation in the state other than gift, inheritance and estate taxes. This section is declaratory of existing law as to the securities, bonds, notes, warrants or other evidences of indebtedness of any issuer that is a joint powers authority or parking authority.