The elevator in your house isn't for public use and falls under your home insurance and your personal liability.
You keep mentioning that your building isn't full. Im sure your insurance company didn't lower their rates because of that. And I'm sure if you get sued a Lawer won't be sympathetic to you.
Your "almost empty" building falls under your general liability and depending on how you have your business set up you may be liable as well. I've worked in the elevator industry for 30+ years. I don't know you, and have no way of benefiting from the advice I'm giving you. So I'm asking you, is the little money you are trying to save worth the risk?
