I was stuck on 10 for a while too. I'd say check the airport if you haven't already.
I keep being told I can't enter without an ID. It's weird as I've finished everything else in the game. Maybe a bug? Do you know how you got in?
I snuck around the building behind the guard. Since the guard says you can't be there, I got serious GTA flashbacks when I did that.
Thanks. I've finally finished this game after months!
