It is assumed that the office was 620m long from south to north, 400m long from east to west, the base line of the building pointed 50 to 60 degrees west from true north, and the front was at the southeast side.
南北620m、東西400m以上の規模で、建物の基準線は真北から西に50-60度傾き、南東辺を正面としたらしい。