'Upper chambers' in the Bible

Then David gave to Solomon his son the plans of the vestibule, and of its houses, and of its treasuries, and of its upper chambers, and of its inner chambers, and of the place for the mercy seat,

And the weight of the nails was fifty shekels of gold. And he overlaid the upper chambers with gold.

Now the upper chambers were narrower: for the galleries took more space away from these, than from the lower, and the middle chambers of the building.

For they were in three stories, but had not pillars like the pillars of the courts: therefore the upper chambers were narrowed, more than the lower and the middle chambers from the ground.