After preparing for negotiations with Yamaoka, the representatives were gathered at the residence of the Satsuma clan in Edo, located at Tamachi (Minato Ward, Tokyo) to conduct the negotiation for the Surrender of Edo-jo Castle: The highest personnel responsible representing the Tokugawa family side, Ichio OKUBO who was the Kaikei Sosai, Kaishu KATSU who was the Rikugun Sosai, and Takamori SAIGO who was staff officer of the 'expeditionary force to the east.'
山岡の下交渉を受けて、徳川家側の最高責任者である会計総裁・大久保一翁、陸軍総裁・勝海舟と、東征軍参謀・西郷隆盛との江戸開城交渉は、田町（東京都港区(東京都)）の薩摩藩江戸藩邸において行われた。