Need to setup a wired network in basement of office building.

First, don't know if the wireless range will reach basement.

I am aware of DD-WRT but more complicated than I'd like.

years ago I had a "white" Netgear (I think) router working as a bridge however I had to set the base to a fixed IP address that I did not want to do.

Any no-brain idiot-compatible ways of doing this?