Elevators

I thought I would be able to build units using elevators. I wanted multi floors but without multiple stairs. Stairs for emergencies. Is it possible to have multiple elevators? I wanted to build apartments using the elevator but it says I can only use one. I thought for sure I would have a time where one would  break down and maintenance would have to fix the elevators , water heater, breaker box, etc. you know maintenance stuff. Now I feel like I brought useless packs. What is the point?