I have a 2000 IFC interpretation of this code section that states the level of exit discharge and the first floor are two different animals. I agree with this interp,(Section B 1003.2.13.1.1 IBC Interpretation No. 27-03 , Issued 3/8/04), however, the IBC 2006 and 2009 seem to change the code section 1007.2.1. Commentary states that emergency power and the requirement for accessible means of egress shall be enforced in a five story building. However this interpretation would require it in a four story building.I believe it should also be enforced in a four stoy building as the interpretation from the fire code has level of exit discharge at grade and the firrst story above being one floor above level of exit discharge. I know this thread might be a bit confusing, it is Monday, appreciate any thoughts.