Can a S1 be on the first floor of a two story building? B is on the second floor. Type VB. No sprinkler system. 2009 IBC Look at section 503. Reference the 1997 UBC section 302 last paragraph. I can’t find it in the 09 IBC. I think it can but need a reference from the 09 IBC. BTW. Both occupancies have grade level exits.