Meet Jenny Haeg. The broker founded Custom Spaces only two years ago, and today she works exclusively with Airbnb, Spotify, and Square, to name a few. In the past, she nabbed spaces for Dropbox and Twitter. Her secret: Her firm, now five employees, doesn't turn away startups that need only 1,000 SF. In fact, she makes a beeline for them, knowing they grow. When she started working with Twitter in 2006, it had four employees (and the only person worth following was Shaq). She went on to place Twitter into 60k SF at 795 Folsom and 11k SF at 539 Bryant. She started working with Airbnb in 2008 and five years later found it 170k SF at 888 Brannan (below).

The new HQ for temp housing giant Airbnb sits inside a former factory, and the founders opted to retain the original railroad tracks running through the lobby. The office also features meeting rooms modeled after listings around the world, from Berlin to Bali. Now Jenny's planning a future NYC office, as Bay Area tech firms hunt for satellite locations there.