Ezekiel 41:6-7

6And the side-chambers were three, chamber over chamber, and thirty in order; and they entered into the wall which the house had for the side-chambers round about, that they might have hold; but they had not hold in the wall of the house.

7And for the side-chambers there was an enlarging, and it went round about [the house] increasing upward; for the surrounding of the house increased upward round about the house; therefore the house had width upward, and so ascended [from] the lower [story] to the upper, by the middle one.