Your first option is to carefully review the preliminary title report and title report that your presumably received before and when you closed escrow on your property.If such is stated regarding the easement that you are writing about, you were on notice before close and have very little legal recourse with respect to what you have written. If the easement is not listed in the preliminary and actual title report then you possibly have a claim against your title insurance carrier in that it means nothing from what you have written if the tie in by the neighbor is not on your parcel.Given such and the complicated nature of easements and valuation of them, I suggest that you consult with a real estate attorney with experience in this area of the law to advise you how your should proceed concerning your matter.