I'm Doug, and I'm very sorry to hear of your client's situation. My goal is to provide you with excellent service today.
The fact that the HOA may be moving toward a class action matter does not prevent your clients from suing the sellers for failure to disclose and breach of contract and seek an award of damages
necessary to repair the undisclosed issued, or the loss in value of the property based on the slope issues.
Your client's will need to retain a local real estate attorney to write a demand letter to the sellers demanding settlement or possibly mediation to resolve the matter. This is an entirely separate matter from the class action suit and would have to be handled separately.
Your client appears to have a meritorious case based on the facts that you have set out here.
You may reply back to me using the Reply link and I will be happy to continue to assist you until I am able to address your concerns, to your satisfaction.
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I wish you and yours the best in 2015,