Depending on how the 2 buildings are wired electrically, you may be able to use powerline ethernet extenders with a router in AP mode or just an inexpensive AP. I've had decent luck with them in the past.
Depending on how the 2 buildings are wired electrically, you may be able to use powerline ethernet extenders with a router in AP mode or just an inexpensive AP. I've had decent luck with them in the past.