What building in central Tokyo, i can go up anytime for free??

Question

1. Not a residential building.

2. I am going star gazing. (I know it might not be clear skies at tokyo)

3. not tokyo tower

Answer 1

You can go to the 45th floor observatory of the Tokyo Metropolitan Government Building in Shinjuku for free.  It's open until 11 pm.  Good luck seeing the stars though.  Even if the sky is clear, all of those neon lights create a lot of light pollution, blocking all the stars!

Answer 2

If you really want to go star gazing, Tokyo is too bright to watch even in mid night. Go rural mountain top. It is much easier and effective.

Tokyo Metropolitan office tower observation deck is just enough for outside viewing downward.