Usable Area

The usable area in an office building is the floor area available for the tenant's use within his demised space. In general, it is measured from the glass line of the exterior wall to the centerline of demising partitions. The floor area occupied by structural elements (columns) within the space is included in the usable area.

BOMA (Building Owners and Managers Association) has established standards for calculating usable and rentable areas. The calculations should be standard from building to building. However, the geometry of the space will effect the amount of usable space required to accommodate a program of requirements. Column spacing, size and shape of the space are the three most significant influences on the plan efficiency of a space. In some situations, the perimeter required to provide private offices with exterior windows in combination with the depth of the office (corridor to exterior wall) may determine the required usable area.


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