Of course I could not resist climbing the stairs, we see them. In the distance we see the north end, we can also see how the level ground stretches for a while to what I think was the edge of what I call the Middle part. To get there one should descend along a path, out of view, to the left, that after a while passes through a gate, from which oen gets to some more, but lower, level ground, to then climb up again.
On the ground in front we see the round edge of what is on the map identified as K, the area nearer us must be L.

One of some pictures of what I call the south end building.
I do not know more about it. It has a couple of what must have been windows from the start, as well as some large holes in its walls that probably are results of neglect or attack. A staircase leads to its top. One can see there is some substructure that I did not dare enter.