What is the name of your state (only U.S. law)? RI . We purchased a home in 2004. We have retaining walls on the east and west sides of our property on the property line. Recently the developement was resurveyed and the property lines have changed. Now our neighbors property to the west comes beyond the retaining wall into our back yard. Our property to the East goes beyond the east side retaining wall into the yard of our other neighbor. We have attemted to contact the builder, engineering company and the planning board of our town. No one will return our phone calls. If the second set of boundries are correct, and the builder developed the land off the first set of boundries, what legal options do we have?