I would have the revolving door lead to the Mystic elevator wherever it is. Physics do not apply to the house.
Sure, I know that physics don't apply to the House. Wrapping my head around the idea that the Revolving Wall in the top floor still goes the Mystic Elevator in the basement would take a little, but not a lot of effort.
However, if I were to do it this way, should I still allow the Mystic Elevator to return to this revolving door if it comes back to the top floor? If I do so, I also imagine that I should disallow rooms to be built on the opposite side of the wall.
You can see the dilemma caused by this one tile flip.