And the side chambers surrounding the temple were wider at each successive story. Because the structure surrounding the temple went upward by stages on all sides of the temple, for that reason the width of the temple increased as it went higher; and so one went up from the lowest story to the highest by way of the second story.
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An enlarging - The “wall for the side-chambers” had for the ground story its full thickness of five cubits (Ezekiel 41:9) - then…

And there was an enlarging.— The description in this verse is difficult to understand and has prompted a wide variety of opinions.…

And there was an enlarging, and a winding about still upward to
the side chambers
The…

After the prophet had observed the courts, he was brought to the temple. If we attend to instructions in the plainer parts of religion, and profit …
Albert Barnes
AlbertBarnes