“You obviously don’t know real estate law. If someone builds a fences across your property line and you do nothing about it for, oh! Let’s say 15 years.
They can legally claim that you’ve deeded your real rights to that land”
Yep, and that is why whenever you have a survey of your land you should always ask to have it show your house and adjoining appurtenances on the survey map..Have seen some very surprising results when that was done-property lines that cut through the house, garage, between house and garage and even showing the house was in two counties with the county line splitting the house; even saw a house situated between two States (NY and Pa)!.... Many surveys only show the boundary lines of the property and may note a right of way or easement and that would not reveal the problems...
Multi-state dwellings are surprisingly common, in my experience. Funniest I saw, though, was a house sawn in two and split apart!
Are you a RPLS?