A walk of ten cubits' breadth inward - This seems to have been a sort of parapet.
Or, In the front “of the chambers” was a gangway “of ten cubits” breadth (leading) “inward,” a path “of one cubit, and their doors toward the north.” The “gangway” had stairs to the upper stories, while along the north front of the building there was a kerb of one cubit, as before the guard-chambers Ezekiel 40:12, on which kerb the north doors (leading to the basement) opened. Others follow the Septuagint “And opposite the chambers a walk 10 cubits in width to 100 cubits in length.”