View of the northeastern corner of the Monumental Hall. Note the delicate protruding pilaster to the right of the center of the image and to the left of center note the well–defined horizontal “railing” that is about chest high that separates the lower and upper portions of the wall.
I visited this all in the 1970’s with Gabi Barkai and I thought he said it might be Hasmonean. But our guide said it was Herodian (37–4 B.C.) with possibly some Hasmonean elements.
I am not sure of its function but it certainly is “monumental.” In my Zondervan Atlas of the Bible I labeled it as a “Public Building” (p. 250).