Interesting, but seems hardly surprising - also not restricted to San Francisco. Where I live (Europe) the trendier and younger companies are in warehouse-style

Interesting, but seems hardly surprising - also not restricted to San Francisco. Where I live (Europe) the trendier and younger companies are in warehouse-style offices in the inner city and the more established ones have moved into bigger, more purpose-built places in the suburbs because they need the space and their workforce wants to live there.