The height thereof threescore cubits These proportions differ from those of Solomon's temple, which was but thirty cubits high, only the porch was a hundred and twenty cubits high, and but twenty cubits in breadth. Either therefore Solomon's cubits were sacred cubits, which were larger than the other, and these but common cubits; or, the sixty cubits of height are meant only for the porch. And the word rendered breadth, should be rendered the extension or the length of it; it being improbable that the king should give orders about the breadth, and none about the length of it.
Related Commentaries of Ezra 6:3
Ezra 6:3
3 In the first year of Cyrus the king the same Cyrus the king made a decree concerning the house of God at Jerusalem, Let the house be builded, the place where they offered sacrifices, and let the foundations thereof be strongly laid; the height thereof threescore cubits, and the breadth thereof threescore cubits;