Cross reference
Ezekiel 42:6
6 For they were in three stories, and they didn't have pillars as the pillars of the courts: therefore [the uppermost] was straitened more than the lowest and the middle from the ground.
Ezekiel 41:6
6 The side-chambers were in three stories, one over another, and thirty in order; and they entered into the wall which belonged to the house for the side-chambers round about, that they might have hold [therein], and not have hold in the wall of the house.
1 Kings 6:8
8 The door for the middle side-chambers was in the right side of the house: and they went up by winding stairs into the middle [story], and out of the middle into the third.