Possible encroachment- how to handle

[Carolina Mejia]

Hi, i have a piece of property that is 1.35 acres in GA that a friend of a friend is looking to sell. Its nothing special it has an old 87' 3/2 trailer and a cement block 3/1 house both houses share utilities. The seller has a seller finance agreement with prior owner. His balloon payment is approaching in 12/2023. In researching the property i found the ArcGIS website and saw that the back cement house is actually half on the property line with the wooded lot owned by someone else behind the property. I called seller he said not that he had a map somewhere showing that behind that house there was still 25feet of property. I asked him if he was ok if i ordered a land survey don't to see where the property lines are. Are land surveyors the only people who can do this? My question is, if the house is indeed encroached- what happens then? Can i call the owner of the lot behind and try to buy that piece of land? if they say no will i have to take it down? Or will something only happen if the back owner complains? for reference back lot is an undeveloped 69 acre wooded lot. What are the legal implications? The house has been there at least ten years. this is a good deal with great potential cash flow and just an looking at all the ways it could go wrong and right. Please advise. See picture of arcgis website below