10 C.F.R. § 434.505 Reference building method.
Title 10 - Energy
505.1 The Reference Building procedure shall be used only when the Proposed Design cannot be represented by one or a combination of the Prototype Building listed in subsection 503.1 or the assumptions for the Prototype Building in Subsection 510, such as occupancy and use-profiles, do not reasonably represent the Proposed Design.
Title 10: Energy
PART 434—ENERGY CODE FOR NEW FEDERAL COMMERCIAL AND MULTI-FAMILY HIGH RISE RESIDENTIAL BUILDINGS
Subpart E—Building Energy Cost Compliance Alternative
§ 434.505 Reference building method.