The sign indicating the basement's NW stairwell is red and white.
A door with a red sign to the right, reading Floor; Basement; Northwest Stairwell; No Roof Access; Exit on 1st Floor.
Red sign next to a door with Floor Basement Northwest Stairwell No Roof Access Exit on 1st Floor in white letters
Red sign saying "Floor Basement" next to a yellow door.
Doorway that leads to stairs and a sign that says Floor Basement Northwest Stairwell No Roof Access Exit on 1st Floor.