Ezekiel 42:1-3

Then he brought me forth into the utter court, the way toward the north: and he brought me into the chamber that was over against the separate place, and which was before the building toward the north.

Before the length of an hundred cubits was the north door, and the breadth was fifty cubits.

Over against the twenty cubits which were for the inner court, and over against the pavement which was for the utter court, was gallery against gallery in three stories.