Net Square Footage

The usable or “rentable” area of a specified space (e.g. a suite, floor, or an entire building). This measurement generally excludes non-rentable areas such as common areas, hallways, and mechanical rooms. 

As an example calculation, if a building consists of 100,000 Gross Square Feet, and 10,000 square feet are utilized as lobbies and hallways, then the Net Square Footage of the building would be 90,000 square feet.