Fortunately, we have very good code enforcement in my town in Florida. But I understand your point.
It is criminal what happens to elderly people who get trapped in situations like this. The grafitti, the overcrowding, the loud music, the noise at all hours, petty thefts, auto accidents. Sometimes assaults because they are 'gringos, and therefore deserve it'. This will be coming soon to the neighborhood of a lot of Americans who won't know what hit them. Put an end to it now, or you will never again get the chance. Southern California is likely unsalvageable. Don't let it happen to you.