[header] How to measure commercial square footage [title] Compare measurement techniques. [step] Landlords may use several different measurement techniques to assess the square footage of a space. These methods include : [substeps] Useable square footage, or usf: this is the space the tenant actually occupies. 
Rental agents often quote this figure to prospective renters, but it represents only part of the lease arrangement. Rentable square footage, or rsf: this is the combination of the useable square footage and a percentage of the common-area square footage of the building.