I forgot how, but there was this little broken part that I climbed up through. Can't remember where... I think I went down the slides on the side? I dunno, I was winging it as I was pretty lost at that point as well.
Official We're Doomed guy of the NUNSG board http://i40.tinypic.com/2vxnibk.png
Its the only lit up balcony you haven't gone to. Should be right behind the animus. After ascending the broken stairs and moving into the next room there is a large square in the middle with "elevator" shafts. Go to the bottom level and one of the door is open. Climb your way up.
DoubleTap868 - " Oh my bad. Spoiler Alert: George Washington survives the Revolutionary War."