Re: Does My Deed, Paid Land Survey and City Hall Documents "Hold Any Water"
As a surveyor with almost as much experience, I advise my clients of all options. A Lot Line Adjustment is one of the better options in many such situations and one that many landowners are not aware of. It is a completely voluntary process and indeed is one that landowners cannot be forced to enter into short of a court order as a result of a suit brought by one or both landowners. A LLA is an administrative procedure that costs in whole merely a small fraction of what litigation would cost each party.
The OP expressed no desire to be "a nice guy", but neither did he indicate that he was itching for a costly legal battle that would most likely result in peaceful neighbors being next door enemies for as long as each remains at their respective residences.
I do not insert myself as a mediator, but I do offer my services to facilitate a LLA if the landowners jointly, and of their own volition choose that course of action after I make it's availability known to them. If my client chooses to pursue means, litigation or otherwise to regain property included within their written title, I offer my services to provide exhibits, documentation, and testimony toward that effort as well.
I do not withold any viable options that I am aware of from my client. I'm a little surprised that you responded to my suggestion the way you did as I was under the impression that you were also the type of professional who would advise your client of all reasonable options to a solution and allow them to make a fully informed decision.
I'm a surveyor, not your surveyor & not an attorney.
Advice is general survey, not legal. Hire a local professional for specific advice.