Ezekiel 42:3-5

3over against the twenty [cubits] that pertained to the inner court, and over against the pavement that pertained to the outer court; there was gallery against gallery in the third [story];

4and before the cells was a walk of ten cubits in breadth, [and] a way of a hundred cubits inward; and their entries were toward the north.

5And the upper cells, because the galleries encroached on them, were shorter than the lower, and than the middle-most of the building.