Good question, sorry I wasn't clearer. I opted to leave the cord exposed across the floor from the wall plate to the lamp, since the plate was close to where I wanted the lamp anyway. I was also on a carpeted floor, so where there was any horizontal run I believe I was able to stuff the cord between the carpet and the wood trim -- somewhat unsightly but the best I was willing to do in my rented space.
How did you snake it through the floor? Or are you suggesting to make a small hole directly behind the lamp in the wall?