All the walls ran in straight lines, and all the angles of the rooms and passages were right angles.

There were more passages in the building than usual but still the apartments very frequently opened into one another; and almost one-half of the rooms were passage-rooms.
The doorways were mostly placed without any regard to regularity, seldom opposite one another, and generally towards the corners of the apartments.

There was the curious feature, common in Assyrian edifices, of a room being entered from a court, or from another room, by two or three doorways, which is best explained by supposing that the rank of the person determined the door by which he might enter.

Squared recesses in the sides of the rooms were common.

The thickness of the walls was great.