My question is regarding measuring the exterior walls for useable tenant area. The building conditions are as follows:
Exterior walls are predominantly floor to ceiling storefront glass systems however they are divided by non-structural vertical spandrel panels throughout the exterior face.
Questions:
Would the useable area calc line go through the spandrel panels (as if they were columns) or to the finished face (as if they were walls)?

Thank you for your time,
Maritza Garcia