The structure of this villa and its interior were refurbished to restore its original classic appearance, and the cylinder type new subsidiary exhibition room was planned to be constructed underground, connected with the villa by a corridor in order not to disturb the natural environment and the calm atmosphere of the villa.
山荘の建物や内装は建設当時のクラシックな姿に修復される一方、山荘に付属する形で廊下で結ばれたシリンダー状の新展示室は、周囲の自然環境や山荘の落ち着いた調和を乱さぬよう、地下に計画された。