Ezekiel 40:15-17

Amplified Bible

¹⁵ From the front of the entrance gate [on the outside] to the front of the inner porch (portico) of the gate [the distance] was fifty cubits. ¹⁶ There were shuttered windows looking toward the guardrooms, and toward their side pillars within the gate all around, and likewise for the porches. And windows were all around inside; and palm tree decorations were on each side pillar.

¹⁷ Then he brought me into the outer courtyard, and behold, there were chambers and a pavement made for the courtyard all around; thirty chambers faced the pavement.