Ezekiel 42:3-5

3Opposite the inner court of twenty cubits, and opposite the pavement of the outer court, was gallery against gallery in three stories.

4In front of the chambers, toward the inside, was a walk ten cubits wide, at a distance of one cubit; and their doors faced north.

5Now the upper chambers were shorter, because the galleries took away space from them more than from the lower and middle stories of the building.