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Can they run a sleeve in there to prolong the life of your main sewer? They last a long time if done properly and only if possible. This was there's no separate sewer line, but that depends on your city code. I can only think that the roots are busting through your clay or cast iron pipes.
Reason for your neighbor's back up is because the clog is up stream from where your pipe enters the main. Getting a camera in there is always my recommendation, but for a 100 year old house with big trees, you got some issues with roots or perhaps collapsed pipes.
I hate those roto-rooter guys. From my experience, the only thing they are good at is unclogging siht and they know siht only flows downhill, and that they rape ya when it comes to paying for service outside of drain unclogging service, that's it. Get a local plumber and have him bid it out and see what he thinks. With a camera, you know exactly what's going on and how to proceed. Make sure they can and are insured and qualify to dig out the street. That's where the big bucks is spend.
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