Toranomon Hills Art
Just like every major new building in Tokyo has its own character it seems like they also have their giant sculpture. Like the spider Maman outside Roppongi Hills or the Gundam robot outside Diver City in Odaiba, so Toranomon Hills now have a statue called Roots by Jaume Plensa, which you can read more about here. It is really a huge piece of art and visible from a bit of a distance. Keep an eye out for it the next time you are in the neighborhood!