I’m surprised anyone has heard of Forest Knolls! I grew up there.
It definitely used to be weird and relatively affordable for the middle class but not really any more.
Last year someone bought a house in the neighborhood for $1.3 m. It was worth $350k when my parents moved to the area about 25 years ago. The new owners have a pair of new Porsches in the driveway. Maybe that counts as middle class in the Bay Area these days but it’s still not obtainable for the vast majority of Americans.