tHAT'S a tough one. Too bad you didn't give this more thouight before finishing basement. Anyway, I just did some in my kitchen. Code requires one every 4'. If you have access to cieling,like suspended cieling tiles, you can run electric from first outlet, up wall into cieling, over 4' and back down. Lot of wasted electric cable. The proper way is straight through studs at same height as existing outlet and tie them together. I can tell you trying to do that without opening wall is next to impossible! Sounds like you need an electrician. Good Luck!