Each gate chamber was one rod long and one rod wide, and there were five cubits between the gate chambers. The inner threshold of the gate by the portico facing inward was one rod deep.

Ezekiel 40:8
Then he measured the portico of the gateway inside;

Ezekiel 40:10
There were three gate chambers on each side of the east gate, each with the same measurements, and the gateposts on either side also had the same measurements.

Ezekiel 40:21
Its three gate chambers on each side, its side pillars, and its portico all had the same measurements as the first gate: fifty cubits long and twenty-five cubits wide.

Ezekiel 40:29
Its gate chambers, side pillars, and portico had the same measurements as the others. Both the gateway and its portico had windows all around; it was fifty cubits long and twenty-five cubits wide.

Ezekiel 40:36
as did its gate chambers, side pillars, and portico. It also had windows all around. It was fifty cubits long and twenty-five cubits wide.

And every little chamber was one reed long, and one reed broad; and between the little chambers were five cubits; and the threshold of the gate by the porch of the gate within was one reed.