Super short version, we have a retaining wall on our property line. The neighboring lot isn't developed yet but is recorded. The wall snakes into the neighboring lot by several feet. Some pics below. My lot is on the downhill/right side.
Our builder says this is normal and that legally both lot owners share this wall. Essentially, it all kinda evens out. While it is not contentious (yet) my neighbor doesn't want my lot to eat into his at all.
I note our builder's position is the one that requires no work by them, so I don't believe them. I'm inquiring in a couple of places, but curious to poll the all-knowing denizens of Texags.
Is there ANY chance the builder is correct and this is not an issue? I don't want to have a property line battle 5 years from now.

Our builder says this is normal and that legally both lot owners share this wall. Essentially, it all kinda evens out. While it is not contentious (yet) my neighbor doesn't want my lot to eat into his at all.
I note our builder's position is the one that requires no work by them, so I don't believe them. I'm inquiring in a couple of places, but curious to poll the all-knowing denizens of Texags.
Is there ANY chance the builder is correct and this is not an issue? I don't want to have a property line battle 5 years from now.
