See the URL to get more information about The National Art Center, Tokyo. http://www.nact.jp/english/index.html - entrance fee is free. However, I couldn't enter because I visited this place around 6:00pm. The visiting time start at 10:00am and close at 5:30pm. We are late for 30 minutes so the guard didn't allow us to go inside as you can see from the photo. I was able to take one photo.
Below are the pictures that i took at Tokyo Mid Town. Go to this URL for more information - http://www.tokyo-midtown.com/en/about/index.html