Ezekiel 40:17 (KJV)

And from the face of the gate of the entrance unto the face of the porch of the inner gate were fifty cubits.

And there were narrow windows to the little chambers, and to their posts within the gate round about, and likewise to the arches: and windows were round about inward: and upon each post were palm trees.

Then brought he me into the outward court, and, lo, there were chambers, and a pavement made for the court round about: thirty chambers were upon the pavement.

And the pavement by the side of the gates over against the length of the gates was the lower pavement.

Then he measured the breadth from the forefront of the lower gate unto the forefront of the inner court without, an hundred cubits eastward and northward.