As a customer, you would not have been told that this entire wall opens up and this is how actors get around through behind the scenes corridors. Something too tight for a wheel chair or things that someone with disabilities can not to, you have a by pass planned out for that item then return to their group. You can make this very entertaining as behind the scenes the people in wheel chairs get to pull levers do things that interact with the scares and continue on. Or simply get to see what is going on in there and that is just as entertaining.
It really isn't to tough to be ADA compliant inside the haunt and access to the building just has to be already set up to be on one plain or have ramps. In one of out charity haunts, the guy who looks like a burn victim in a wheel chair IS a burn victim in a wheel chair (very realistic) and he gets the tour to make sure a wheel chair can be handled with a full grown man over the ramps and bridges and tight turns.
As far as not having to spend $200,000 retrofitting some building to have ramps and proper bathrooms and such when in reality only 1 in 10,000 customers might need such a thing, you simply stay away from buildings with such zoning. YOu stay away from buildings that although you are ready to rent are really mortgage out with federal loans, banks with crazy insurance rules to make it tough and allow only the elite to lease a property. You don't set up you haunt in a federal building, a mall or strip mall where the regulations are intended to attract only big corporations. Just because you can get an LLC form doesn't mean you are a corporation trying to write off millions in expenses and plan on only being there for 2 to 5 years.
Or you outright own the property and you get to say what happens there. Any public servants with opinions can just get off of your property and aren't welcome. Still it is just so easy to make things wide enough and safe enough to have full confindence and cooperation of the public officials and everyone is happy.
Another fabulous post from the U.S.Department of Wild Imaginings, now in spectaclar stereo, sponsored by the Adhesives and Sealants Council, suggesting ways to stick things together since the 1800s. Not fabulous in a gay way. Your results may vary. Illinois residents add 8% sales tax. These posts have been made by professional post makers, do not try this type of posting on your own without extensive training, lovely assistants and a trusty clown horn.