The 3rd head of Senke school, Sotan, had passed Fushin-an house on to his 3rd son, Sosa KOSHIN, and moved to newly built tea-ceremony house on the same premise to spend his retirement together with his 4th son, Soshitsu Senso.
千家3代宗旦は、不審菴を三男江岑宗左に譲り、敷地内に新たに茶室を建てて隠居し、四男仙叟宗室と共に移り住んだ。