1 Kings 6:5-6

5He built a complex of rooms against the outer walls of the Temple, all the way around the sides and rear of the building.

6The complex was three stories high, the bottom floor being 7-1/2 feet wide, the second floor 9 feet wide, and the top floor 10-1/2 feet wide. The rooms were connected to the walls of the Temple by beams resting on ledges built out from the wall. So the beams were not inserted into the walls themselves.