Notwithstanding Section 53531 or any other provision of law establishing limitations on the rate of interest of any indebtedness or obligation of a city, county, or city and county the rate of interest on any indebtedness or obligation thereof which is payable to the federal government or any agency or instrumentality thereof or any indebtedness or obligation guaranteed by the federal government or any instrumentality thereof may be at a rate higher than the limitations established in any other law if such rate is the rate established by the federal government or any instrumentality thereof. Any such indebtedness or obligation shall be in such form and denomination, have such maturity, and be subject to such conditions as may be prescribed by the federal government or agency or instrumentality thereof.