Someone

I is indoor rooms
N is nanotube doors
P is phase-able rooms

       [I]
        N
[P][P]N[I]
        N
       [I]---->Hallway leading to unfinished dormitory section, ZebedyColt has a room here.
        |
        V         
      Stairwell up and down, only one nanotube door downstairs, research machines and vaults behind it
      Joe's office is off this area.