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The destruction from the 7.1 earthquake that rocked central Mexico on Tuesday is a reminder of the vulnerabilities Southern California faces from a strong temblor.

After decades of debate, Los Angeles and several other cities have in recent years required retrofitting of buildings that experts say are most vulnerable to collapse in a major quake. The city of Los Angeles has among the nation’s strongest quake rules, requiring fixes to both brittle concrete buildings and wood soft-story apartments.

More than 65 people died when these types of buildings collapsed during quakes in 1971 and 1994.

Other cities also require some retrofitting, including Santa Monica, which recently approved the nation’s strictest rules, as well as San Francisco and a number of smaller cities.

Los Angeles inspectors spent about two years developing a list of 13,500 so-called soft-story buildings that will probably need seismic strengthening. These apartments, which feature flimsy first floors that often serve as parking spaces, became popular after World War II as Los Angeles was spreading north into the Valley and west toward the ocean.

But they've also proved to be vulnerable to violent shaking. Such buildings collapsed in the 1989 Loma Prieta and the 1994 Northridge earthquakes, including one apartment building where 16 people died.

Owners of each building have been put on notice, and a number of them have already begun the retrofitting process. The retrofits can cost as much as $130,000, which has sparked concerns from owners and residents feeling the pressure of rising rents and a housing crunch.

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