Portion of the plannable area on a floor that can be assigned to occupant groups or functions. Assignable area includes interior walls and interior encroachments. It does not include restricted areas, occupant voids, unassignable areas or secondary circulation. Users may choose to measure interior encroachments, and if measured, interior encroachments like secondary circulation area are generally pro-rated back to the occupant(s), e.g. not directly assignable.