If I was doing a FRA on this building, and I do many involving similar issues, I might do a couple of things:
Firstly, I might recommend that the RP has an electrical engineer survey the electrical supply to the lift motors to assess if there is any possibility of a fire in the building compromising the electrical supply to the lift. Further actions could go a couple of ways depending upon the result of this. As an example, a fire in the lift motor room would have to be approached by the stairs but, perhaps, fires in other parts of the building pose no threat to the electrical supply for the lift.
Secondly, I would point out the facts as kurnal has laid them out but I would add, as I'm sure many of the readers of this would, that the RP must appreciate that, as it stands, the fire service are unlikely to use the lifts in case of fire and so any fire on any of the upper floors is likely to be given the opportunity to grow substantially before the fire service start tackling it. From a property and business protection point of view, this is not good and the RP might just feel inclined to provide duplicate supplies and correct enclosure for the lift in order to give additional resilience to his business.
Stu