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.
KJV
And the side chambers [were] three, one over another, and thirty in order; and they entered into the wall which [was] of the house for the side chambers round about, that they might have hold, but they had not hold in the wall of the house.
ASV
And the side-chambers were in three stories, one over another, and thirty in order; and they entered into the wall which belonged to the house for the side-chambers round about, that they might have hold therein, and not have hold in the wall of the house.
The side rooms surrounding the temple widened at each successive level, because the structure surrounding the temple ascended by stages corresponding to the narrowing of the temple wall as it rose upward. And so a stairway went up from the lowest story to the highest, through the middle one.
KJV
And [there was] an enlarging, and a winding about still upward to the side chambers: for the winding about of the house went still upward round about the house: therefore the breadth of the house [was still] upward, and so increased [from] the lowest [chamber] to the highest by the midst.
ASV
And the side-chambers were broader as they encompassed the house higher and higher; for the encompassing of the house went higher and higher round about the house: therefore the breadth of the house continued upward; and so one went up from the lowest chamber to the highest by the middle chamber.
The outer wall of the side rooms was five cubits thick, and the open area between the side rooms of the temple
KJV
The thickness of the wall, which [was] for the side chamber without, [was] five cubits: and [that] which [was] left [was] the place of the side chambers that [were] within.
ASV
The thickness of the wall, which was for the side-chambers, on the outside, was five cubits: and that which was left was the place of the side-chambers that belonged to the house.