For Amazon's reputation for internal cost-cutting (such as displaying the pricing on computer peripherals in vending-machines in their SLU offices), Amazon makes me scratch my head for building-up their HQ in one of the most expensive cities to buy land in the world - ditto Facebook in Menlo Park. Why didn't Amazon choose Kent or Auburn instead - or Facebook building in the north-east of the Bay rather than the hyper-expensive south-west? Given Facebook's propensity to attract and hire young twentysomethings then surely their exact location in the Bay Area is immaterial (similarly, Amazon attracts a lot of ex-MSFT folk from the Seattle Eastside).
It is a mystery.
But that explains the higher-rents!