Does the Walking Dead shop have a elevator or a way for a person in a wheelchair to go downstairs?

There is an elevator in the building.

I do think there is one, but I would call to make sure it's in working order.

If I'm not mistaken there is an elevator between them and the coffee shop next door.

I just called. There is ramp access to the store and they have an elevator to get to the museum for wheelchair access.