Read 1 Kings 6:10 Using Other Translations
And then he built chambers against all the house, five cubits high: and they rested on the house with timber of cedar.
He built the structure against the whole house, five cubits high, and it was joined to the house with timbers of cedar.
As already stated, he built a complex of rooms along the sides of the building, attached to the Temple walls by cedar timbers. Each story of the complex was 7 feet high.