The bottom floor was five cubits wide, the middle floor six cubits, and the third floor seven cubits. He also placed offset ledges around the outside of the temple, so that nothing would be inserted into its walls.

1 Kings 6:5
Against the walls of the temple and the inner sanctuary, Solomon built a chambered structure around the temple, in which he constructed the side rooms.

1 Kings 6:7
The temple was constructed using finished stones cut at the quarry, so that no hammer or chisel or any other iron tool was heard in the temple while it was being built.

Ezekiel 41:6
The side rooms were arranged one above another in three levels of thirty rooms each. There were ledges all around the wall of the temple to serve as supports for the side rooms, so that the supports would not be fastened into the wall of the temple itself.

The nethermost chamber was five cubits broad, and the middle was six cubits broad, and the third was seven cubits broad: for without in the wall of the house he made narrowed rests round about, that the beams should not be fastened in the walls of the house.