I had a row of a dozen Black Walnut trees lining one side of the driveway at my other farm. They’ll kill just about anything near them with a toxin in their roots. I used raised beds across the driveway, hoping to stem that tide - and it did for me - not sure what the new owners are going to do in the future, but they’re taking really good care of the place.
The wood is going to be worth a fortune in the future, though even if they cut them now (they’re about 25 years old, now) the toxin stays in the soil for years afterward.