Berean Study Bible
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.

King James Bible
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.

American Standard Version
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 .

Darby Bible Translation
And for the side-chambers there was an enlarging, and it went round about [the house] increasing upward; for the surrounding of the house increased upward round about the house; therefore the house had width upward, and so ascended [from] the lower [story] to the upper, by the middle one.

Douay-Rheims Bible
And there was a broad passage round about, going up by winding stairs, and it led into the upper loft of the temple all round: therefore was the temple broader in the higher parts: and so from the lower parts they went to the higher by the midst.

English Revised Version
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.

Young's Literal Translation
And a broad place and a turning place still upwards are to the side-chambers, for the turning round of the house is still upwards all round about the house: therefore the breadth of the house is upwards, and so the lower one goeth up unto the higher by the midst.