What to do with land in a flood zone?

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I have a piece of land near San Antonio in a very desirable Area. The property is approximately 1.27 acres.

It is cleared ect. I took the land as a down payment on a house that we owner financed. The previous owner/ seller talk up the land and it did look good. I went to sell the property and it appears that building a house on the property would be problematic due to the land being in a flood plan. I have no intention of making a deal with the former owner, but he knows he got me on that one. 

 It appears that building a big nice shop and then owner financing it could be an option since a shop would not be at risk in the same way as a house, but I’m not sure if I could get the building financed or even what it would cost.

And suggestings?