I am exempt from compliance or “grandfathered”
The answer is “NO”. A place of public accommodation must remove barriers when it is “readily achievable” to do so. Although the facility may be “grandfathered” according to the local building code, the federal ADA does not have a provision to “grandfather” a facility. While a local building authority may not require any modifications to bring a building “up to code” until a renovation or major alteration is done, the federal ADA requires that a place of public accommodation remove barriers that are readily achievable even when no alterations or renovations are planned. As a business you have an on-going obligation to bring your business into compliance.