Service charge for mortgages assigned to and held by the Secretary
Notwithstanding any other provision of this chapter, the Secretary is authorized to include in any mortgage insured under any subchapter of this chapter after September 23, 1959 , a provision requiring the mortgagor to pay a service charge to the Secretary in the event such mortgage is assigned to and held by the Secretary. Such service charge shall not exceed the amount prescribed by the Secretary for mortgage insurance premiums applicable to such mortgage.