When an attorney acts negligently when representing a client in litigation, the client can bring an action against the attorney for professional negligence or malpractice. The client can only prevail on the malpractice case by proving that the result of the original litigation would have been more favorable but for the attorney's negligence. In Viner v. Sweet (2003) 30 Cal.4th 1232, the California Supreme Court ruled that the same principle applies when a lawyer is negligent in handling negotiations or other business transactions: the client must prove that some additional measurable benefit would have been achieved if the attorney had not been negligent in the representation.
The Supreme Court remanded the case before it to the Court of Appeal, which has now ruled that the judgment against the attorney defendants must be reduced, as a matter of law, from $13,291,532 to $515,760. The attorneys involved admitted that their negligence caused the reduced amount of damage; the Court of Appeal concludes that there was no substantial evidence to establish that any of the other damage amounts represent profits or benefits that necessarily would have come to the plaintiffs in the absence of the attorneys' errors.
For the most part the claims that the appellate court disallowed arose from the clients' contention that the attorneys should have negotiated certain more favorable terms in the sale of the clients' successful audiobook business. The buyers' representatives testified at trial that they would not have agreed to those terms if they had been proposed, and might well have broken off negotiations altogether rather than accept them. Under those circumstances, the court concluded that the attorneys could not be held to make good their clients' loss of benefits that would not have been achieved even in the absence of the attorneys' negligence.
The Court of Appeal's decision in Viner v. Sweet (April 23, 2004), Case No. B138149 is available at these links in PDF and Word formats.

