Okay, nothing to tell, lol, but damn was it exciting to go up there, even though my friend was TERRIFIED security would kick us out.
I told him it was a public building and we were fine, but no one answered the buzzer.
Still was really cool to see, I imagine they're more welcoming to tourists when Suda's actually there(I think GDC was happening, great timing).
And I tried calling, a Japanese receptionist answered, awkward.

The building was pretty easy to find, it's publicly listed on Google and everything, right off the Chuo Sobu line.