They own the building/storefront (i.e. no lease and no mortgage)? If you're a retail outlet and you own the property outright, you can weather almost any storm.
Usually (in my experience) it survives until the owner retires or dies, and then disappears.
“Brick Shithouse” was their term for it.
“An article built more robustly than its function requires; implies an element of indestructability.”
https://en.m.wiktionary.org/wiki/brick_shithouse#:~:text=Nou...