Accessible features and construction governed by this chapter shall be provided:
- To the entire building, as if the building were hereafter erected, where a change is made in the main use or dominant occupancy of such building.
- Throughout a space, including the immediate entrance(s) thereto, where an alteration is made that is considered either (i) a change in occupancy classification of such space in accordance with this code, or (ii) a change in the zoning use group of such space in accordance with the New York City Zoning Resolution.
- Entrances within 18 inches (457.2 mm) of the sidewalk. Where the floor elevation of a space is within 18 inches (457.2 mm) of the sidewalk, and the immediate entrance(s) to such space provides direct access to the sidewalk, such immediate entrance(s) shall be provided with an accessible route to the sidewalk. Where the immediate entrance(s) to such space are only through an adjacent space, such as a building lobby, such space shall be provided with an accessible route, through the adjacent space, to the sidewalk.
- To provide an accessible route to a space, including rooftops, where prior to a change in use of occupancy or in how such space is used, this chapter would not have required an accessible route for new construction.