You use the term "several months" to move it from the time you bought it. Is that period clearly defined (ie. 3 months from date of purchase, etc). If it is, and you are still within that time, then you should be fine. If it is not clearly defined, then you could be in trouble. As far as the $500 per month value, I imagine that the land owner can pretty much choose what ever price they want. I hope it all works out for you, but in the meantime I would double-time it on getting it off their land, because it could get ugly.