Here is an article, check the pictures. A housing complex (Urbanizacion) was constructed in an area that had some underground water flows. As a result, at least one street has slided down the hill and many of the homes backyards are gone and the houses are now partially hanging in the air.
Lots of finger pointing, it been about a year, no solution yet, the houses are not safe to live in but the owners are stuck with having to pay the mortgage and not being able to sell either.
Spanish article but sending you mostly to see the pictures.