Gross leasable area (GLA) is the amount of floor space available to be rented in a commercial property. Specifically, gross leasable area is 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, Canada and the United Kingdom, the square foot is used). It is measured from the center line of joint partitions and from outside wall faces. That is, gross leasable area is the area for which tenants pay rent, and thus the area that produces income for the property owner.