Okay, I found it...
IBC, 303.1, Group A, A-2, Bars.
IBC 903.2.1.2 Group A-2 [F] fire sprinklers are required if...
The fire area exceeds 5,000 SF,
The fire area has an occupant load of 100 or more,
The fire area is located on a floor other that the level of exit discharge.
and
IBC Table 1004.1.1 states that with standing room only the floor area in SF per occupant is 5 net or with tables and chairs the floor area in SF per occupant is 15 net.
Now if that is not confusing, now the Bar Owner has some thinking to do.
If anyone has anything to add, please do so!