Inherited Building next to lawyer - he thinks he owns part

[Alan Robson]

Hello! I inherited a building from my late mother who had a tenant. That tenant is now gone thanks to COVID (they went out of business). I am trying to find a new tenant, and I am fielding questions regarding property lines. I have a scheduled survey to be done in 8 weeks due to demand (very small town) and until that happens I will not know where my property lines fall. There are no records of the boundaries at city hall. When my mother purchased the property in 2007, the next door neighbor told her that he and his law office own up until a certain point. She never got a survey done, and he told her "if you get a survey done, you will be pissing a lot of people off in the neighborhood" whatever that means. 

Obviously the survey is scheduled, but he is scaring off potential tenants. As they tour the property, the comes out of his office and tells them that he owns the land up until my building, to which people are turned off. 

My question is this: is there any way he can fight a legal survey with some fancy legal work in regards to encumbrances, easements, or the like if the survey is not in his favor and is in mine? 

Thanks!