GROSS FLOOR AREA (GFA) - the total floor space within the perimeter of the permanent external building walls (inclusive of main and auxiliary buildings) such as office areas, residential areas, corridors, lobbies and mezzanine level/s. The GFA shall also include building projections which may serve as floors or platforms that are directly connected to/integrated with areas within the building/structure, e.g., balconies (Refer to Section 1004 of Rule X of this IRR) and the GFA excludes the following: