; (ii) available appliances, technologies, materials, and construction practices; and (iii) the economic considerations under subsection (b)(4). (B) Determination or election by developer Not later than 270 days after the date of receipt of proposed changes of the Secretary under subparagraph (A), a developer shall— (i) determine whether— (I) to publish a new revised code accepting the proposed changes; or (II) to reject the proposed changes; or (ii) if the developer elects not to make a determination under clause (i), publish a notice of that election, together with the proposed changes. (C) Final determination by Secretary (i) In general A final determination by the Secretary shall be made on the model building energy code or standard, as modified by the changes proposed by the Secretary under subparagraph (A). (ii) Additional determinations If a model building energy code or standards developer makes an election pursuant to subparagraph (B)(ii), the Secretary shall make the following final determinations for purposes of this subsection: (I) A final determination regarding whether the code or standard of the developer, absent any changes proposed by the Secretary under subparagraph (A), will— (aa) improve energy efficiency in buildings, as compared to the existing model building energy code; and (bb) meet the applicable targets under subsection (b)(2). (II) A final determination regarding whether the code or standard of the developer, as modified by the changes proposed by the Secretary under subparagraph (A), would— (aa) improve energy efficiency in buildings, as compared to the existing model building energy code