According to the building codes of the United States and many other countries, elevators are never to be used as a means of escaping a fire in any building no matter what it's height. Exit signs are posted everywhere on each floor to direct tenants or residence to the nearest fire escape or stairwell. You would never see crowds of people coming off an elevator. There is too great of a risk of a fire getting into the elevator shaft and spreading due to the updraft created in the shaft. There would also be too much smoke which would suffocate anyone using an elevator.
Correction: The main reason for not using elevators in a burning building is that the heat of the fire can short circuit the buttons and cause the elevator to stop and open the door on a floor that is heavily involved. The sudden heat and smoke can kill everyone in the elevator almost instantly.