(pronounced net skwair FU-tij)
Put simply, this is considered the amount of space required for the occupants to function in the space – i.e., space for offices, cubicles, conferencing, storage, etc. It does not include the area needed to get from space to space, otherwise called circulating. See the other definitions below to put it all into perspective.
See also: Usable Square Footage, Circulation Factor, Building Common Area