That’s not OC, it’s LA County. It’s part of the South Bay, inland from major bubble beach cities, Redondo, Hermosa and Manhattan Beach. Gardena has always been one of the lower to moderate income neighborhoods in the South Bay, but most of the better paid Nissan employees live in the beach cities or Torrance. The highly paid ones live in Palos Verdes.
This is old news, but the the impact has yet to be fully appreciated. That is a large number of mid to high income people leaving all at once.