(A) Not to exceed, for such part of the property or project as may be attributable to dwelling use (excluding exterior land improvements as defined by the Secretary), $38,025 per family unit without a bedroom, $42,120 per family unit with one bedroom, $50,310 per family unit with two bedrooms, $62,010 per family unit with three bedrooms, and $70,200 per family unit with four or more bedrooms, or not to exceed $17,460 per space; except that as to projects to consist of elevator type structures the Secretary may in his discretion, increase the dollar amount limitations per family unit to not to exceed $43,875 per family unit without a bedroom, $49,140 per family unit with one bedroom, $60,255 per family unit with two bedrooms, $75,465 per family unit with three bedrooms, and $85,328 per family unit with four or more bedrooms, as the case may be, to compensate for the higher costs incident to the construction of elevator-type structures of sound standards of construction and design;

(B) the Secretary may, by regulation, increase any of the dollar amount limitations in subparagraph (A) (as such limitations may have been adjusted in accordance with section 1712a of this title ) by not to exceed 170 percent in any geographical area where the Secretary finds that cost levels so require and by not to exceed 170 percent, or 215 percent in high cost areas, where the Secretary determines it necessary on a project-by-project basis, but in no case may any such increase exceed 90 percent where the Secretary determines that a mortgage purchased or to be purchased by the Government National Mortgage Association in implementing its special assistance functions under section 1720 1 1 See References in Text note below. of this title (as such section existed immediately before November 30, 1983 ) is involved. Notwithstanding any other provision of this paragraph, the amount which may be insured under this section may be increased by up to 20 percent if such increase is necessary to account for the increased cost of the project due to the installation therein of a solar energy system (as defined in subparagraph (3) of the last paragraph of section 1703(a) of this title ) or residential energy conservation measures (as defined in section 8211(11)(A) through (G) and (I) of title 42) 1 in cases where the Secretary determines that such measures are in addition to those required under the minimum property standards and will be cost-effective over the life of the measure.