Kommentar zu Jechezkiel 41:10

And between the chambers was a width of twenty cubits There were chambers in the Outer Court, at the north and at the south of the Inner Court, near its wall. And there was a space twenty cubits wide between the walls of the chambers and the walls of the cells that were around the House. It was not so in the Second Temple edifice, but [it will be so] in the future edifice.