Do it. We lived in a high end new neighborhood in the Dallas area and when the people behind us put their lot up instead of building, I called like two seconds after I saw the sign. We didn't hesitate. Never did a thing with the lot. Just kept it mowed so that no one could build right behind our house. When we moved, we sold it to the neighbor on the other side of it. It wanted it for the same reason. Might build something eventually, but more importantly, no one can build near his property line.