The most important thing to consider while having a Dc is cooling.
and I would assume a basement Isn't a very cold place,unless you have half a dozen air coolers installed in there,besides It must be piping hot in there,cooling is the most important thing to consider while having a Dc.
The charges of having a sever are a very high let alone having a whole Data center,you might want to go and browse the charges on some of the poweredge servers from Dell.
Those are standard,you'll get the Idea of the Price once you check out their website.