I have a 3 story building where the second floor has an entry/exit on one side that is at grade. The main lobby is on the first level. The tenant spaces on floor 2 are not defined yet and the first tenant on this floor is questioning the USF from the landlord who is using Method B. I have identified BBC and Tenant Ancillary (areas of extended circulation and door setbacks. However, I am questioning the section of corridor leading to the exit. Would it be Building Service? Part of BBC? or simply Tenant ancillary extended corridor that gets divided between tenants? Thank you!