I can see that they have gotten off on the wrong foot with your neighborhood. I’ve had experience with that. From both sides, being the poor folk that didn’t fit in trying to gradually build up - but some things need to happen first, like thinking ahead about lights and what might happen if our need for a water line affected the neighbors on a long holiday weekend - ouch. We got a lot better at flying under the radar over the years.
The home across the street from us seems to be cursed that way, first the folks that couldn’t care for their pets and this latest lot where the gentleman was arrested within months of moving in for drug trafficking. Way to go!
I’ve ridden in a place where the arena was zero lot line, and it wasn’t an issue zoning wise as an outdoor arena as it’s nothing more than a paddock with special footing. It was a great use of the lot but as you see it can come up with problems.
IMO they will go away eventually. Offering to buy them out is actually a good option if the money can be had, BUT if the acreage behind you is going to industrial it might be best to move on as you are thinking.
For short term and/or EZ sale of the property, you say that right now it has become a storage lot for vehicles and trailers, that they have water and are residing there in a camper with no septic? And I suppose they are a little lax with the trash removal and all that, plus the light.
I doubt they had any control over the light, it just got plopped there, we had to pay to have our power poles moved and the light was on one of them, stupid spot for it because the old barn was long gone, so bye bye light. $1500 per pole to move them, if the resident wasn’t right on top of siting the pole for minimum disturbance to the neighborhood then that would be twice the price to them and looks like they don’t have that in view of your other posts.
I think there are some good suggestions in terms of trees. You might try a staggered row of fast growers backed up by slower, thicker growers. Yes you will lose some space on your land. One of the very first things I did here was look into establishing a tree line, instead DH wanted orchards so those went on each side of the house, and now the side neighbors each have a nice view of a half mature orchard plus fence, and all our junk is behind the house and shop.
Noise wise our horses have gotten quite used to loud bangs and fireworks that they can’t see. I have a neighbor that shoots off some really pretty ones just over the ridgeline. If you have stock there that are used to it and don’t react, and you don’t react, then your rescues will soon learn to ignore it. Perhaps lengthening the initial introduction by a week?
If you have to disclose anything about these neighbors, which where I used to live I would have if I’d been complaining to the County about their zoning violations and whatnot, it could make a sale of your property more difficult. Or these people could have the perfect neighbor for themselves all picked out and it could sell right away.
It’s a bad deal and I do understand. I’d think of relocating the arena, putting in a 12 foot wide buffer of trees of various types, fast growers and thick growers, evergreen suitable to your area. If you set it up you could make it a riding area or gallop.
If you don’t want to talk to the neighbor then vertical fencing or a strategically located planting to block the light in your windows.
Best of luck and I wish you peace.