Wired WiFi extender or AP

Is there a "wired" extender or access point out there?

I need to extend my WiFi to a place outside its range (and the new access point is also outside it's range). Basically have two buildings set up on the same internet connection so I don't have to get a second account and pay a second monthly fee. It's for my home, which is next door to my business, so I am not violating any agreement from my cable company or anything.

I can run a Cat 5/Cat 6 cable to the second building, and plug that into a network port on the primary WiFi router, but I haven't found an extender that will take a wired network connection, only ones that will take WiFi from the original router and extend it, but only if within WiFi range of the original router.

Thanks