During the performance period for LEED EBOM, the building owner is remodeling the main entrance vestibule to the project building. The vestibule is a separate, enclosed space, 263 sq ft with a wall mounted cabinet unit heater. The alterations will include structural, electrical and interior finishes, involve multiple trade specialties, make substantial changes to the entire vestibule/room, and the site will be isolated from building occupants during the construction. Since this space uses a wall mounted cabinet heater and is not a part of the base building HVAC system, is the flush out of the entire building required?