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.