It all depends on the building. Apartment buildings, for example, need only make the public areas (i.e., lobbies, communal ADA compliant bathrooms, ADA compliant kitchens), but don’t necessarily need to make modifications to the tenants’ dwelling areas, except by request. Buildings like hospitals, schools and malls must abide by compliance in almost all cases. And, although most buildings don’t require an elevator except where their height exceeds three stories, malls and airports must have them regardless. The experienced ADA contractors at National LRM can give you further direction as to what modifications you need to make to achieve compliance.