Commercial leases are not calculated like residential leases. Residential leases may include the total square footage of a home, but rent is not based on square feet. Monthly rents for residential properties are largely determined by looking at comparable rentals in the area. In commercial real estate, monthly rent is calculated in a variety of complex ways using several types of square-foot measurements.
The measurements used in determining commercial space rents are based on guidelines set by the Building Owners and Managers Association (BOMA) International and are considered industry standard throughout the United States.