There is no such thing as a rescission right for buyer's remorse after the purchase of a business, unless such a term is specified in the purchase agreement - which would be unusual. Nothing will prevent a buyer from later suing you, but it is unlikely they will have a valid or meritorious claim, unless, of course, you failed to disclose material information. Any lawsuit brought against you would likely be in the Superior Court of California, in the county where the purchase agreement was entered. However, if the buyer is from out of state and the amount in controversy exceeds $75k, they may bring their claim in federal court.
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I am not clear based on your description, what business you sold, and how it was sold. A proper sale of business would somewhat resemble a real estate transaction. That is, the parties will enter a written agreement including representations and warranties by the seller, the parties open escrow, the purchaser conducts her/his due diligence reviews, and the transaction is consummated at the close of escrow. In this type of scenario, there is little room for "excitement and emotion" and the purchase price typically reflects the value of the business. I suggest you review your transaction documents with your own attorney to protect your legal rights.
Probably the only way a contract for the sale of a business could be rescinded is if there is some type of fraudulent representation or concealment of material facts. How a buyer evaluates how much a business would make in the future is an opinion, and it might be wrong -- or right. A client of mine "overpaid" $15,000 for some intellectual property from a kind of bankruptcy sale, and it came to be worth millions.
Work with the buyer on the due diligence -- and if the buyer doesn't perform the due diligence, make sure that the contract shows the opportunity was given. If the buyer ridiculously overpaid, the buyer may want to sue, but you want to be prepared. A good lawyer will help you document that now, which will save you a ton of money later. Avvo has quite a few good lawyers in the LA area who can help you. An ounce of prevention now can save a hundred pounds of cure later.
The law can punish immoral actions, but it does not stand in the way of stupid actions.
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