Thank you for your response. Would the upper floor not count as an overhang, and would therefore not be considered in locating the "measure line"?
I'm looking at a space design for a client and am wondering if I recess his entrance door, so it does not swing out over the sidewalk, will that space used by recessing the door be counted in his GLA? His space would be rectangular, but recessing the entrance takes a "bite" out of the space, which will not be enclosed, but does have structure above it (residential unit).
The building is mixed use, with retail on the main, and residential above.