Floor plans are measured from the interior walls but take into account the wall thickness so the calculations are done from the outside measurements. Condominiums and Apartment buildings do not share this same measurement.
Please note: Our floor plans are diagrammatic and intended to show the layout of the structure with a rough/approximate square footage. The sq ft numbers we provided are what our draftsperson came up with, but should not be taken as authoritative or conclusive. Furthermore, we have no way of knowing how any previous square footage numbers were arrived at. Some plans are measured from interior walls, others from exterior walls, etc.