At the center of Roppongi Hills stands the 238 meter Mori Tower, one of the largest buildings in the city. While most of the building is occupied by office space, the first few floors have restaurants and shops and the top few floors house an observation deck and modern art museum that are open to the public.

The Tokyo City View observation deck is one of Tokyo's best. When the weather permits, views can also be enjoyed from an open-air deck on the rooftop. Also located on Mori Tower's top floors is the Mori Art Museum, a contemporary art museum with a focus on new artistic ideas from all over the world.