'Side chamber' in the Bible

The entrance to the lowest side chamber was on the right [or south] side of the house; and they would go up winding stairs to the middle [level], and from the middle to the third.

Then he measured the wall of the temple, six cubits [thick, to accommodate side chambers]; and the width of every side chamber, four cubits, all around the temple on every side.

The thickness of the outer wall of the side chambers was five cubits. But the free space between the side chambers belonging to the temple