▁residence ▁of ▁the ▁head ▁of ▁the ▁administration , ▁and ▁the ▁associated ▁gra in ▁store house . ▁While ▁larger ▁domains ▁had ▁cast les , ▁certain ▁smaller ▁domains ▁did ▁not , ▁and ▁the ▁j in ' ya , ▁much ▁smaller ▁than ▁a ▁castle , ▁hous ed ▁the ▁administration . ▁Some , ▁such ▁as ▁the ▁Kom ono ▁Jin ' ya ▁in ▁Kom ono , ▁Mie ▁Pref ect ure , ▁had ▁a ▁watch t ower ▁( y ag ura ), ▁m im ick ing ▁the ▁don jon ▁of ▁a ▁castle . ▁O thers ▁had ▁mo ats ▁or ▁ear then ▁walls , ▁in ▁some ▁cases ▁left ▁over ▁from ▁an ▁earlier ▁castle ▁on ▁the ▁site . ▁ ▁Gener ally , ▁domains ▁ass essed ▁at ▁ 3 0 , 0 0 0 ▁k oku ▁or ▁less ▁had ▁a ▁j in ' ya ▁instead ▁of ▁a ▁castle . ▁Additionally , ▁they ▁were ▁found ▁on ▁sh og unal ▁lands ▁and ▁those ▁head ed ▁by ▁hat am oto , ▁and ▁within ▁large ▁domains ▁j in ' ya ▁served ▁as ▁district ▁headquarters ▁( gun ▁da ikan - sh o ). ▁They ▁were ▁also ▁found ▁in ▁exc la ves ▁of ▁domains . ▁ ▁The ▁" three ▁great ▁j in ' ya " ▁were ▁at ▁the ▁I ino , ▁Tok uy ama ▁and ▁T sur uga ▁Dom ains . ▁ ▁S ources ▁This ▁article ▁incorpor ates ▁material ▁from ▁ <0xE9> <0x99> <0xA3> 屋 ▁( J in ' ya ) ▁in ▁the ▁Japanese ▁Wikipedia , ▁retrieved ▁on ▁February ▁ 2 4 , ▁ 2 0 0 8