IT MIGHT WORK!
We use airport. Our newtork operates fine. Our house is only two stories, but we can go outside even. The range is pretty good, even through walls. The signal could be effected by the density of your walls. The WIFI waves will carry through a wall made primarily of sheetrock, no sweat, but super thick brick walls can decrease your signal strength significantly. There are five walls between my computer and out base station. I still have a great signal quality.
Go for it. Save yourself the trouble of weakinging your building's structural integrity.