Pool of Radiance - Wealthy Area Cont'd

Poking around the buildings in the south of the wealthy area, where I killed a lot of orcs and found treasure, I found a message on a wall:

NORTH WALL.  RI  T FRONT GLAS . SE

Not sure what it's referring to, but the reference to glass makes me think it's in the Temple of Bane just west of here. I'll see if the directions make sense when I get there.