According to peace terms on destruction of the castle and reclamation of the moats, it was decided that the Toyotomi family was responsible for Ninomaru, while the Tokugawa family for Sannomaru and the outer moat..
和議条件の内、城の破却と堀の埋め立ては二の丸が豊臣家、三の丸と外堀は徳川家の持ち分と決められていた。