That to the extent guaranteed loan commitments exceed $200,000,000,000 on or before April 1, 2019, an additional $1,400 for administrative contract expenses shall be available for each $1,000,000 in additional guaranteed loan commitments (including a pro rata amount for any amount below $1,000,000), but in no case shall funds made available by this proviso exceed $30,000,000: Provided further , That during fiscal year 2019 the Secretary may insure and enter into new commitments to insure mortgages under section 255 of the National Housing Act only to the extent that the net credit subsidy cost for such insurance does not exceed zero. General and special risk program account New commitments to guarantee loans insured under the General and Special Risk Insurance Funds, as authorized by sections 238 and 519 of the National Housing Act ( 12 U.S.C. 1715z–3 and 1735c), shall not exceed $30,000,000,000 in total loan principal, any part of which is to be guaranteed, to remain available until September 30, 2020: Provided , That during fiscal year 2019, gross obligations for the principal amount of direct loans, as authorized by sections 204(g), 207(l), 238, and 519(a) of the National Housing Act, shall not exceed $1,000,000, which shall be for loans to nonprofit and governmental entities in connection with the sale of single family real properties owned by the Secretary and formerly insured under such Act. Government national mortgage association Guarantees of mortgage-backed securities loan guarantee program account New commitments to issue guarantees to carry out the purposes of section 306 of the National Housing Act, as amended ( 12 U.S.C. 1721(g) ), shall not exceed $550,000,000,000, to remain available until September 30, 2020: Provided , That $24,400,000 shall be available for necessary salaries and expenses of the Office of Government National Mortgage Association: Provided further , That to the extent that guaranteed loan commitments exceed $155,000,000,000 on or before April 1, 2019, an additional $100 for