6 The rooms on the top floor had no pillars, as the courts had; so they were smaller in floor space than those on the lower and middle floors.

Read Ezekiel 42:6 Using Other Translations

For they were in three stories, but had not pillars as the pillars of the courts: therefore the building was straitened more than the lowest and the middlemost from the ground.
For they were in three stories, and they had no pillars like the pillars of the courts. Thus the upper chambers were set back from the ground more than the lower and the middle ones.
Since there were three levels and they did not have supporting columns as in the courtyards, each of the upper levels was set back from the level beneath it.