property line/survey problem

next to my house is a lot. my neighbor owns it. he claims that in 1940, there was a fire there and that when the house was removed they left the wall attached to my house- therefore the side of my house which has a “double wall” according to him, is 7 inches into his lot- again according to him. He claimed that he did a survey and that it proved it. I am gutting the second floor and my carpenter said there is no double wall anywhere. I would like to know how I can get documents which will show, for sure, where is my land start and where it ends. Anyone has any information with that?
Thanks

By Williams |