Neighbor Is Specifically Targeting Another In A Law Suit, But Myself And 15-ish Neighbors Got Looped In…i Can’t Sell My Home Until It’s Over

I live in the U.S. specifically Illinois. Very TL;DR since this has been going on for over 3 years.
Neighbor M (85) is the plaintiff and he’s specifically targeting neighbor J(79). M claims that J’s house was illegally built because a no build line from 1929 says no homes from the start of the line (behind our homes) to the road (in front of our homes) can be built. J’s home was built in 1933. This all started over a beef M has with J over J disrespecting him once.
My home was built in 1996. The other neighbors and I got looped in because J’s lawyer argued if J’s house is violating the no build line, so is everyone on this side of the street.
M claims he doesn’t want anything to happen to us (everyone but J) and doesn’t want us to do anything but accept that the no build line is enforceable. That would mean our homes could not be rebuilt in case of fire. No sheds, no trampolines, no fixing the deck. Nothing. M wants only J to suffer the consequences but that’s not how this will work. If a judge rules in favor of M, we all suffer.
Obviously, we can’t sell our home because of this, and no one will buy or even insure our home if the no build line is enforced.
I’ve contacted a real estate attorney (not sure if that’s who we want here) but this is going on 3 years now and I’m getting to a point where we want to sell and move closer to family and we’re unable too.
Half the neighbors have lawyers and I’m wondering if we can bring a lawsuit up against M since we can’t sell our property until his lawsuit is finished, and if he wins, no one will ever buy our home (and no one will insure our home).
Any advice?
ETA: title insurance will not help, they said because M doesn’t want anything to happen to us and seeks nothing if he wins, that there’s “nothing we can defend against”.
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