It has also been conjectured that there was a second or grand staircase on the south-east face, equal in width to the second story of the building, and thus occupying nearly the whole breadth of the structure on that side.

A number of narrow slits or air-holes are carried through the building from side to side; they penetrate alike the walls and buttresses, and must have tended to preserve the dryness of the structure.

The second story is, like the first, a parallelogram, and not of very different proportions.

Its longer sides measure 119 feet, and its shorter ones 75 feet at the base.
Its emplacement upon the first story is exact as respects the angles, but not central as regards the four sides.

While it is removed from the south-eastern edge a distance of 47 feet, from the northwestern it is distant only 30 feet.