When I moved to Menlo Park in 1987, there was automatic weapons fire from Whiskey Gulch every weekend. It was all liquor stores and bars, hence the name. The fried chicken outlet there had full transparent bulletproofing, heavier than some banks. East Palo Alto was Murder City, USA. Tiny Whiskey Gulch, about three city blocks, had the highest murder rate per square mile in the US. I thought I was moving into a declining area, so I rented a house, instead of buying.
That was fixed by leveling the entire area, removing a freeway offramp, and replacing the liquor stores and poor people with a Four Seasons hotel and a large office building housing a law firm and medical offices. The final solution to the underclass was thus implemented.
When Facebook moved to Menlo Park, house prices went through the roof.