Hypothetical Cases
Business Liability for Earthquake Hazards & Losses

The owner of an unreinforced masonry commercial or office building has been notified by the City that it is hazardous and that there is a significant risk of damage in an earthquake. The City has no program (as permitted by California law) to require upgrade of private buildings to a life-safety standard rather than full current building code compliance. Although the building owner is not required by the current building code or the City to do any rehabilitation, she chooses, on the advice of design professionals, to spend 10 percent of the money required for complete compliance with the current code to achieve 80 percent safety. An earthquake occurs and there are some severe injuries, though substantially fewer casualties than in other similar buildings where no rehabilitation had occurred. What happens?

The analysis of this hypothetical situation is similar to that applied to the previous situation where the owner did not act. Two factual differences, and their impact on the analysis, should be noted.

First, the issue changes from "was it negligent to take no action?" to "was it negligent to undertake only limited rehabilitation?" The types of evidence available to answer the latter question include all of the types of evidence available to answer the first question.

Second, additional standards are available, e.g., the building code, the code for retrofit of existing buildings, and the California law permitting updating of buildings to reduce (but not eliminate) the risk of life loss or injury, rather than to full compliance with the current building code for new construction. Usually, the defendant's negligence is presumed if it does not comply with an applicable statute or regulation and the non-compliance causes the kind of harm which the statute or regulation was designed to avoid. In this instance, the standards established by the building code for new construction do not require any action on the part of the defendant. Therefore, it is not applicable and there is no negligence per se.

However, the standards established by the building code requirements may be evidence relevant to determining the appropriate behavior in this situation. Moreover, this assertion may be bolstered by legislation that permits retrofit to standards that are less than current building codes. If the intent of the legislation is to emphasize that even partial adherence to current building code requirements is desirable, then the probability that the building code is relevant evidence is increased.

While this example has the building constructed of unreinforced masonry, the example could have used another type of known hazardous building, such as a soft-story apartment building, or a tilt-up concrete industrial building. Unreinforced masonry buildings were constructed prior to California's building code requirements for earthquake resistance; soft-story and tilt-up buildings were not. This distinction is of only limited relevance in determining liability in a particular case as various engineering experts are brought before a jury to tell their version of what an owner knew or should have known. On the other hand, the California Government Code specifically singles out unreinforced masonry buildings, requiring disclosure at the time of sale, as well as the posting of warning placards. Thus, it will be more difficult for an owner to plead lack of awareness of a potential hazard with unreinforced masonry buildings.


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ABAG, the Association of Bay Area Governments, is the regional planning and services agency for the nine-county San Francisco Bay Area. This information is based on a two-year research effort that resulted in the 1984 ABAG report, "Liability of Private Businesses for Earthquake Hazards and Losses," including an Executive Summary, a Guidebook, and a Background volume. The research effort that forms the basis for this information was funded by the National Science Foundation's Earthquake Hazard Reduction Program, as well as by ABAG. Any opinions, findings, conclusions or recommendations expressed in this material are those of the authors of these reports and do not necessarily reflect the views of the funding agencies. None of these materials constitute legal or engineering advice to the reader. Please consult your own attorney or engineer for advice on a specific situation or facility. The information contained on these pages was reviewed for accuracy based on 2004 laws and case laws in 2004. This page was last updated 4/13/04 by jbp.