This is a the Park Hyatt Hotel in Shinjukul. I've been told it's the most expensive hotel in Japan. Actually the hotel starts at around the 38th floor. Below that is offices. I don't recommend you stay there though. I visited once and the staff was very rude and snobby. Basically if are not staying there they don't want you there. Because they were such dicks I will never stay there.
You can see that the top of each tower has an atrium which of course have gorgeous views.