How do I determine the size of my project when generating a price estimate or creating a scorecard?

The gross square footage entered for the project should include the sum of the floor areas of the spaces within the building including, as applicable, basements, mezzanine and intermediate-floored tiers, and penthouses with headroom height of 7.5 ft or greater. Measurements must be taken from the exterior faces of the exterior walls OR from the centerline of walls separating buildings. The gross square footage should exclude non-enclosed (or non- enclosable) roofed-over areas such as exterior covered walkways, porches, terraces or steps, roof overhangs and similar features. It should also exclude air shafts, pipe trenches, chimneys and floor area dedicated to the parking and circulation of motor vehicles.