A line that constitutes the perimeter of the Interior Gross Area (IGA) of a floor level. It determines the value of the interior gross area of a floor level and is located at the innermost occurrence of any of the following IGA boundary conditions:
At above-grade level, the edge of the walking surface, limited to the width required for access to and egress from occupant suites, typically five to six feet.
At grade level, a vertical projection of the edge floor level or roof above, and/or limited to the width required for access to and egress from occupant suites, typically five to six feet.
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