of no lesser duration than the existing use restrictions. (9) The transfer does not increase the cost (as defined in section 502 of the Congressional Budget Act of 1974, as amended) of any FHA-insured mortgage, except to the extent that appropriations are provided in advance for the amount of any such increased cost. (d) For purposes of this section— (1) the terms low-income and very low-income shall have the meanings provided by the statute and/or regulations governing the program under which the project is insured or assisted