I would try calling them to find out. Can't imagine them not having a freight elevator at least
There is not a great way to get in there with a wheelchair unfortunatly. It is essentially in a basement with a set of stairs leading from the entrance into the actual bar. Unless there is a hidden elevator somewhere (very possible) then it would be difficult.
I called them about this issue. The bar is located in the basement. I called and spoke to someone at the bar, they said that they have an elevator for those with wheel chairs. They said to inform the people at the podium and the staff will direct you to the elevator.
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