SEC-326 -- LIMITATION ON SECONDARY RESIDENCES. (a) Limitation on Secondary Residences.-Section 203(g)(1) of the National Housing Act (12 U.S.C. 1709(g)(1)) is amended by inserting after the period at the end the following new sentence: "In making this determination with respect to the occupancy of secondary residences, the Secretary may not insure mortgages with respect to such residences unless the Secretary determines that it is necessary to avoid undue hardship to the mortgagor. In no event may a secondary residence under this subsection include a vacation home, as determined by the Secretary.". (b) Applicability.-The amendments made by subsection (a) shall apply only with respect to- (1) mortgages insured- (A) pursuant to a conditional commitment issued after the expiration of the 60-day period beginning on the date of the enactment of this Act; or (B) in accordance with the direct endorsement program, if the approved underwriter of the mortgages signs the appraisal report for the property after the expiration of the 60-day period beginning on the date of the enactment of this Act; and (2) the approval of substitute mortgagors, if the original mortgagor was subject to such amendments. (c) Transition Provisions.-Any mortgage insurance provided under title II of the National Housing Act before the expiration of the 60-day period beginning on the date of the enactment of this Act, shall continue to be governed (to the extent applicable) by the provisions of section 203(g)(1) of the National Housing Act, as such provisions existed before the date of the enactment of this Act.