97 STAT. 1210 PUBLIC LAW 98-181—NOV. 30, 1983 12 USC 1715Z-5. 12 USC 1715Z-6. 12 USC 1715Z-7. 12 USC 1749bb. "(F) bear interest at a rate not to exceed such percent per annum on the amount of the principal obligation outstanding at any time as the Secretary finds necessary to meet the mortggige market, taking into consideration the yields on mortgages in the primary and secondary markets.". (13) Section 240(c)(4) of such Act is amended to read as follows: "(4) bear interest at such rate as may be agreed upon by the mortgagor and the mortgagee;". (14) Section 241(b)(3) of such Act is amended to read as follows: "(3) bear interest at such rate as may be agreed upon by the mortgagor and the mortgagee;". (15) Section 242(d)(3)(B) of such Act is amended to read as follows: "(B) bear interest at such rate as may be agreed upon by the mortgagor and the mortgagee.". (16) Section 1002(d)(2) of such Act is amended to read as follows: "(2) bear interest at such rate as may be agreed upon by the mortgagor and the mortgagee, except that the Secretary may agree to a reasonable extension of the term of a mortgage, the maturity of which is limited by this paragraph to not more than 10 years, if the Secretary determines that unusual or unfore- seen circumstances make such extension necessary to avoid undue hardship to the mortgagor;". MINIMUM PROPERTY STANDARDS 12 USC 1735f-4. SEC. 405. (a) Section 526 of the National Housing Act is amended— (1) in the first sentence, by inserting ", other than manufac- tured homes," after "housing"; (2) by adding the following new sentence at the eifd thereof: "Following the effective date of this sentence, the energy per- formance requirements developed and established by the Secre- tary under this subsection for newly constructed residential housing, other than manufactured homes, shall be at least as effective in performance as the energy performance require- ments incorporated in the minimum property standards that were in effect under this subsection on September 30, 1982."; and (3) by inserting "(a)" after the section designation and adding at the end thereof the following new subsection: "(b) The Secretary may require that each property, other than a manufactured home, subject to a mortgage insured under this Act shall, with respect to health and safety, comply with one of the nationally recognized model building codes, or with a State or local building code based on one of the nationally recognized model building codes or their equivalent. The Secretary shall be responsi- ble for determining the comparability of the State and local codes to such model codes and for selecting for compliance purposes an appropriate nationally recognized model building code where no such model code has been duly adopted or where the Secretary determines the adopted code is not comparable.". (b) The section heading of section 526 of such Act is amended to read as follows: "MINIMUM PROPERTY STANDARDS". 12 USC 1735f-8. TIME OF PAYMENT OF MORTGAGE INSURANCE PREMIUMS SEC. 406. Section 530 of the National Housing Act is amended-
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