Plot for a Retirement Home?

I just saw an ad on Outer banks foreclosures, and guess what? You can actually purchase a canalfront lot for only USD 25,000! I am sure the price is still negotiable. I am just thinking that this could be a good place to build a small retirement home with views. When comparing this with the price of the new BMW 528i which sells for USD 120,000 here; the canalfront lot is a steal! Only problem is a good reputable and cheap builder is quite hard to find. Know any?