Since the honjin (headquarters of army) and family quarter had already existed prior to its construction in 1650, the present-day Imanishi-ke Jutaku was built in the second-phase but it has been told that, situated at the westernmost of the above village, it had a commanding air of a castle tower.
現在の今西家住宅は、1650年建立以前に本陣及び住居が築かれていたことから2度目の普請であるが、前記集落の中の西端にあって、あたかも西の天守閣といった堂々たる風格を現していたと伝えられている。