A roofed corridor running front to back with the stairs inside, six divisions, and a branched roof over the technical strip.
The stairs rise from level 4 inside a walled, roofed corridor that crosses the rooftop from front to back. Each of its six doors opens onto one division. Over the technical strip the roof branches into a ribbed slab: water tanks to the west, A/C to the east. Frameless tempered glass railings throughout, including the one separating the 4-3 and 4-4 rooftops.