Section 1007.2.1 & 1007.4. We have a new mixed use S-2, B. M & R-2 six story building with 3 elevators. 1 elevator serves all floors, 1 elevator serves basement (parking) and upper 3 floors (residential) and 1 elevator serves the basement through the 3rd floor. Do all 3 elevators require standby power or just the elevators serving floors four or more stories above the level of exit discharge (per 1007.2.1). There are two elevators serving these upper floors, would both or one req the standby power? Thanks all.