Not as high as Tokyo Sky Tree at all, you can enjoy a pretty nice view of Hibiya Park and the Imperial palace from Imperial hotel. Trees in the park has turned into red and yellow, and look very beautiful in the light of morning. Even if you are not staying at the hotel, you can always enjoy rich buffet breakfast at Imperial hotel with this view!
Planning to stay here? Very nice. Why not enjoy running around the Imperial Palace, which is a very popular course for people living in Tokyo for running/cycling.