1 Kings 6:6, 10

The lowest story was five cubits wide, the middle was six cubits wide, and the third was seven cubits wide; for he made offsets (niches) in the walls all around on the outside of the house so that the supporting beams would not be inserted into the walls of the house.

Then he built the extensions [of rooms] against the entire house, each [story] five cubits high; and they were attached to the house with timbers of cedar.