Gross leasable area (GLA) in the real estate industry is a term applied to commercial properties to indicate the amount of floor space available to be rented. Specifically, gross leasable area is defined as the total floor area designed for tenant occupancy and exclusive use, including any basements, mezzanines, or upper floors. It is typically expressed in square metres (although in some places such as the United States and Canada, the square foot is used).