; and (2) in subparagraph (C), by striking (C) In the budget request and inserting the following: (C) Budget request In the budget request . 1116. Federal building energy intensity improvement Beginning in fiscal year 2018 and each fiscal year thereafter through fiscal year 2027, the head of each Federal agency shall, unless otherwise specified and where life-cycle cost-effective, promote building energy conservation, efficiency, and management by reducing, in Federal buildings of the agency, building energy intensity, as measured in British thermal units per gross square foot, by 2.5 percent each fiscal year, relative to the baseline of the building energy use of the applicable Federal buildings in fiscal year 2017 and after taking into account the progress of the Federal agency in preceding fiscal years. 1117. Certification for green buildings Section 305 of the Energy Conservation and Production Act ( 42 U.S.C. 6834 ) (as amended by section 1115(b)) is amended— (1) in subsection (a)(3), by adding at the end the following: (D) Certification for green buildings (i) Sustainable design principles Sustainable design principles shall be applied to the siting, design, and construction of buildings covered by this subparagraph. (ii) Selection of certification systems The Secretary, after reviewing the findings of the Federal Director under section 436(h) of the Energy Independence and Security Act of 2007 ( 42 U.S.C. 17092(h) ), in consultation with the Administrator of General Services, and in consultation with the Secretary of Defense relating to those facilities under the custody and control of the Department of Defense, shall determine those certification systems for green commercial and residential buildings that the Secretary determines to be the most likely to encourage a comprehensive and environmentally sound approach to certification of green buildings. (iii) Basis for selection The determination of the certification systems under clause (ii) shall be based on ongoing review of the findings of the Federal