This was taken in 1999 or so. Each evening, 20 people could soak in the thermal bath on the 19th floor whilst enjoying the panoramic view of sunset over the Tokyo skyscrapers.
Apparently this has been improved now to accomodate three people in the tub and the windows have been changed to improve privacy.
Shot with a Mamiya 7 with 43mm lens and Kodak TMax 400 film.