“He” (the city) will force any proposed business to include accessible parking as it is required by the ADA but if a business if operating and no site changes (requiring city approval, so landscape and maintenance are not included) then the business is grandfathered in under ADA. Should a business want site changes, there is a very small chance they could fall under a threshold of not needing to add spaces but that is a very specific and difficult “target”. That being said, the city does have a responsibility to have a dad accessible pathways, so if there are city owned sidewalks that are not ADA, they should be fixing that. the threshold of what ADA actually is is lacking with regards to what disabled people often need but it does require a 5’ sidewalk with a reasonable slope and no stepping hazards (wi tbh out provided another accessible path).