Dunno about where you are, but the hillsides in L A are not stable to start with.
I live on the side of a mountain in Montana, over looking a valley - way down there.
It’s a earthquake area, I was in one about 60 miles away that was an 8.1 when I was young. Multiple fatalities.
Houses on hills usually sit on piers - especially in earthquake areas.
I was providing comic relief.
See:
https://www.youtube.com/watch?v=v7XXVLKWd3Q
Guam tipping over due to and AF Base expansion.
Neither are most of the residents.