Elements that are required to comply serving a *primary function (accessible route to the altered area and the parking, restrooms, telephones, and drinking fountains) that comply with the 1994 TAS are not required to be brought up to the 2012 TAS unless those elements are part of the scope being altered. 

The important thing to remember here is that those elements required to comply serving a renovation to the primary function must comply with the 1994 TAS, otherwise are required to meet the minimum requirements of the 2012 TAS when renovating an area containing the major activity for which the facility is intended. 
*A "primary function" is a major activity for which the facility is intended. Areas that contain a primary function include, but are not limited to, the customer services lobby of a bank, the dining area of a cafeteria, the meeting rooms in a conference center, as well as offices and other work areas in which the activities of the public accommodation or other private entity using the facility are carried out. Mechanical rooms, boiler rooms, supply storage rooms, employee lounges or locker rooms, janitorial closets, entrances, corridors, and restrooms are not areas containing a primary function.