Can you really tell a business owner with a tiny business like this that they have to rebuild their building and put themselves into debt for years in order to accommodate one or two customers.
It’s clear from the photo that the building would have to be rebuilt. He would have to close for at least a week and probably a month while the work was being done. From experience, I can say that it would cost over $100k and may subject the owner to further code compliance work that could add a couple hundred thousand extra to the bill. Often once you start working on a property, you lose the grandfather clauses for other things that are not in current compliance.
Is it worth potentially destroying a business for a couple customers?
No, I don’t think you can. Can you work towards a compromise that satisfies the business owner as well as the disabled patron? Yes...