[masraum]

That sounds like a good investment. Maybe you can check the property values on the county tax assessor's website for that land and any surrounding land. (you can do that here).

Also, see if you can convert any of the land to agricultural use. That's common here, and really cuts WAY back on the yearly taxes. Texas has a bunch of different ways to do that. There is keeping cattle on it (sounds like a pain), growing hay (often can get someone local to harvest and use that, so no/low cost), and many other options.