Section 708.1(9) is added to read as follows: "Tenant Separations." Walls separating tenant spaces in all occupancies shall be in accordance with Section 708.3. and 708.4. Exception: Ancillary tenant spaces of use group M that do not exceed three thousand (3,000) square feet located within a main mercantile occupancy do not have to be separated. Examples of such spaces are, but not limited to, optical services, banking services, prescription services, beauty shops and similar tenant spaces located within mercantile occupancies. Kiosks do not require separation in use group M. Exception: Tenant and guest room separation walls may terminate at the underside of a noncombustible ceiling in Use Group B, buildings having a complete supervised automatic sprinkler system. The wall need not be extended into the crawlspace below where the floor above the crawlspace has a minimum one (1) hour fire-resistance-rating; Where the room-side fire-resistance-rated membrane of the corridor is carried through to the underside of a fire-resistance-rated floor or roof above, the ceiling or the corridor shall be permitted to be protected by the use of ceiling materials as required for a one (1) hour fire-resistance-rated floor or roof system; Where the corridor ceiling is constructed as required for the corridor walls, the walls shall be permitted to terminate at the upper membrane of such ceiling assembly; Fireblocking or draftstopping is not required at the partition line in Group R-2 buildings that do not exceed four (4) stories in height, provided that the attic space is subdivided by draftstopping in to areas not exceeding three thousand (3,000) square feet or above every two dwelling units, whichever is smaller; Fireblocking or draftstopping is not required at the partition line in Use Group B, F, and S buildings equipped with an automatic sprinkler system installed throughout in accordance with Section 903.3.1.1 or 903.3.1.2 of this Code, and provided that automatic sprinklers are installed in combustible floor/ceiling and roof/ceiling spaces.