I know you aren’t getting the answer to the question you wanted, but I think you may start seeing a pattern here. Lots of bad stories with easements. So the biggest bit of information is buyer beware! My original recommendation is to get the property owner out on the land with you, tell him you would like to purchase that land, walk the area with him, explain your plans, and hopes, and ask him what he needs to make that happen, and you want his input. Threats to sue without an agreement won’t favor you. If you both can’t agree, then it’s time to walk away.