Gross square footage is the total square footage of a building including all rentable spaces as well as all “non-rentable” space including common areas, hallways and other areas used for maintenance and operations.
If, for instance, a property contained 90,000 square feet of leasable space and 10,000 square feet of lobbies and hallways, then the building’s total Gross Square Footage would be 100,000 square feet.