Article doesn't say 4K is minimum. It says 350 sq ft is going for $2000 and 1 bed room apartments near Twitter headquater is going for $4000. If you are sharing for mid-1000s then total cost of apartment comes to ~3500 which is quite inline with what article says. BTW, where I live, you can get 3 bed room apartment with a garage and view of mountains for $1700 and commute of < 0.5 hr to major tech companies. And I thought THAT was too high.