As the Governor-General Onsen was built with the same sort of green 13-channel bricks as the Taipei City Hall, which was completed in 1936 and was also a public building, it is assumed that Ide had a hand in its design.
由於總督溫泉與 1936 年落成的台北公會堂，外牆同為蘇格蘭豆沙色（草綠色）13 溝面磚，又是由總督府撥款興建，因此推論井手薰也應該參與了總督溫泉的設計。