Fire officials said about 24 homes in the scenic beach town north of San Diego could be at risk if the slippage continues.
One home in the mountainside area of million dollar plus properties slipped off its foundations and its roof caved in. A 50 to 60 yard (meter) sinkhole scarred the road where the collapse occurred.
One homeowner said the road was blocked by about 25 feet of dirt.
The area has a history of land slippages going back to the 1960s. The most recent street cracks and waterline breaks were noted in July and August, and engineers had warned residents this week that the hillside was again unstable and was threatening as many as eight houses.
Weather was not thought to be a factor in the landslip. Southern California is experiencing a drought with record low rainfall over the past year.
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