In selecting between or among proposed building designs which comply with the applicable energy consumption goal under this part, each Federal agency shall select the design which, in comparison to the applicable COSTSAFR prototype, has the highest Net Savings or lowest total life cycle costs calculated in compliance with subpart A of 10 CFR part 436. [56 FR 3773, Jan. 31, 1991, redesignated at 79 FR 61571, Oct. 14, 2014]