A guide for visiting journalists on how to write a San Francisco “doom loop” story:

You’re here to write the millionth story about the San Francisco doom loop, the much publicized (including at least 100 times by the Chronicle) and hotly debated theory that a city that endured proudly through the 1906 earthquake and fire, AIDS crisis, Zodiac killer, one tech boom-and-bust and the band Starship will be completely undone by … high commercial vacancy rates.”