Im struggling to figure out how to progress, I have turned on the power on B3 and have taken the elevator to the surface and looted everything i can but i cant leave the house because i need a key, i should also add i have not found the key to open what i assume is the armory downstairs.
Any help would be appreciated thanks.

I know it looks like that door on the north side of the house may be the only way out, but that's actually the back door of the house and you can leave out of the front door on the south side of that room. 

This is the exit right where I'm pointing the flashlight

Thank you so much.
After i posted i found the security key (Its in the bottom right room on floor B3 between the seats on the right on the floor). And then almost immediately found that exit after i put this post up (funny how that happens).