This all happened around 3 in the morning and luckily all sorts of alarms went off alerting people that something was up. As a result, nobody was hurt. The landslide pushed a pile of rocks down the hill, knocking over trees, and eventually slammed into the backs of several buildings. Experts say a combination of all the various storms we've had lately caused the hill to be over-saturated and susceptible to landslides.
SFGate has a bunch of photos about the landslide and ABC 7 has video of it taken last night.