All of the companies he mentioned own the land and buildings in these 'burbs where they grew their companies. That is why Apple is building their space ship HQ today... they established equity and are now sitting on more piles of cash than they know what to do with. Their employees own their homes in the areas surrounding them, thus building affluence. In fact, it could probably be further proven that when a company does own its land and buildings, it's inherently stronger and more likely to be able to withstand upturns and downturns in economic timelines (thus giving employees even more incentive to work a fledgling company out of hard times).
There's probably a neat little equation to be written to pithily show the relation. Maybe I will write something up later and post it on ecosteader...
Something about the summation of rents (Sigma) paid by all team members (T[x]) in a startup as a function of runway building. To lengthen the runway, the Sigma cannot grow faster than a company's ability to acquire the top talent needed to build out that runway. There's an inflection point somewhere where you can neither grow, nor afford to attract and hire the top talent because of the wasted and sunk costs in rents and achieving "brand recognition" by being in a place like San Francisco. You can't pay the best people enough to relocate there when the probability of overall success is hinged upon getting more and more VC to sustain there.