Legal Question in Real Estate Law in California

Probably not. The buyer would have to prove an intent to deceive at the time you made the counter-offer. Most likely you had a change of mind rather than a grand plan to "bait and switch" from the get-go.

However, the buyer very well may be able to take you to court for breach of contract and obtain a judgment for "specific performance," a remedy under which you would be obliged to complete the sale under the terms of your counter-offer.

So, there is still a certain amount of legal peril in rescinding your counter-offer. I'd advise consulting with a real estate lawyer before backing out of the deal. Maybe he or she can find some legal reason to invalidate the contract formed by the acceptance of your counter.