Houses built where the earth moves is not an uncommon problem.
Trump bought up a golf course near Los Angeles that was sliding into the ocean. I am sure he got it cheap.
He hired engineers to figure out how to stop the sliding (probably before he made an offer).
They installed the necessary drainage and anchoring system to prevent the hydrolic buildup that was part of the solution, and anchored to bedrock.
The property is now one of the most valuable in the area (being on the coast).
There’s ways around many problems, if one knows and has money to do with.