Cross reference
Ezekiel 42:6
6 For they were on three floors, and they had no pillars like the pillars of the outer square; so the highest was narrower than the lowest and middle floors from the earth level.
Ezekiel 41:6
6 And the side-rooms, room over room, were three times thirty; there were inlets in the wall of the house for the side-rooms round about, for supports in the wall of the house.
1 Kings 6:8
8 The door to the lowest side rooms was in the right side of the house; and they went up by twisting steps into the middle rooms, and from the middle into the third.