Only your principal residence can be protected under the Calfiornia homestead exemption (between $50,000 and $150,000 depending upon personal circumstances).
However, unless you personally guaranteed your corporate debt to the creditor, then the creditor cannot reach your personal property or personally held real estate assets -- unless the creditor proves that your corporation is really just an "alter ego" for your personal property. Courts are unlikely to "pierce the corporate veil" and permit personal liability for corporate debt, except where it's obvious that the owner of the corporation has been using the corporation as the owner's personal "piggy bank."
Hope this helps.
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