What constitutes gross building area?

Gross building area refers to the total area of a building that is defined by its external dimensions. This measurement typically includes all space within the outer walls of the building, which means it accounts for both enclosed areas and certain features that contribute to the overall footprint of the structure.

The correct choice indicates that gross building area encompasses the total gross floor area while excluding all unenclosed areas, which is a key detail. This means that while internal usable spaces are considered, the calculation does not include areas that do not contribute to the building’s enclosed footprint, such as open balconies or courtyards that are not completely surrounded by the building.

In this context, understanding gross building area is essential for various applications such as valuation, tenant leases, and compliance with zoning laws, where precise measurements are mandatory. The concept differentiates between enclosed spaces that can be utilized versus those that cannot serve a functional purpose within the building's structure.