Odd Perhaps even inside a building. Or at least in conjunction with one.
Elevators don’t need to be inside or in conjunction with a building. There are elevators that are built in conjunction to natural phenomena like a hillside cliff. Additionally, I also don’t believe an elevator needs to be man made. In nature there are natural features that resemble and work like a staircase, and this would for any practical purpose be called stairs by locals or anyone using them. Similarly, one can imagine a natural elevator phenomenon that goes up and down caused by wind/waves etc, and we would call this an elevator if it indeed was used as an elevator.
Odd I do not believe though, that a tornado should be considered within the boundaries of the definition.
I also don’t agree that a tornado isn’t an elevator. It can be an elevator, it depends on how it is used. If you use it to move up in the sky then it’s indeed an elevator. I think it’s clear from the word “elevator” (or lift for the british). To elevate means to bring up, elevated means raised, hoisted, lifted, elevated to a higher level. However I agree that an elevator is normally a device that only does this one thing, to elevate and descend, while a tornado also has other functions. So maybe this is something vital about the definition of an elevator, that the only purpose is to elevate and de-elevate.