Deed of Easement Subordination

I am trying to purchase a home in Massachusetts that has had an easement granted for it due to a corner of the home that encroaches on the neighbors property. Some years back, the neighbor of the property had his home refinanced, and the refinancing bank didn't acknowledge the easement. A subordination agreement is required of the neighbor's refinancing bank to allow me to get title insurance.  Per the seller's request,  the neighbor contacted the bank to request a subordination of the mortgage to the Deed of Easement. The bank agreed to issue the subordination. However, since, the neighbor has decided to declined to request the final letter of subordination.  So, I am stuck without the ability to purchase the house due to the neighbor's unwillingness to subordinate his mortgage to the easement.  The easement was granted before the refinancing date - so this doesn't seem quite fair. Are there other options?