7 The side rooms all around the temple were wider at each successive level. The structure surrounding the temple was built in ascending stages, so that the rooms widened as one went upward. A stairway went up from the lowest floor to the top floor through the middle floor.

Read Ezekiel 41:7 Using Other Translations

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.
And it became broader as it wound upward to the side chambers, because the temple was enclosed upward all around the temple. Thus the temple had a broad area upward, and so one went up from the lowest story to the top story through the middle story.
Each level was wider than the one below it, corresponding to the narrowing of the Temple wall as it rose higher. A stairway led up from the bottom level through the middle level to the top level.