As the title above states, there's no way back into the small building after exiting the other side of it for some strange reason, meaning the only way out of it is via the automated teleport back to base after finding Bridgette, hope this gets fixed soon in a later patch.
Here's an image for more clarification:
(Again, it's the small area past the door shown, there's no way back into the small building after exiting the other side, dunno why though. If vid-proof is need then i'll gladly do so, but again, it's pretty much as I said above)