House on 10 acres

[Brandon Proctor]

So I recently talked to a nice older couple who wants to sell their friends old house (friend is in nursing home).  They mentioned they don't want to see the house just deteriorate and not sell. Of course I said I'm interested in buying and asked how much they think it's worth.  The older gentleman figures between 150-200k and they also mentioned the house is on 10 acres of land. 

Now bring new to wholesaling and figuring out comps Im not sure how to go about this one. The house is near other homes but it has by far the most land. How should I go about finding the value of this house BP?  

Thanks!