I agree with the agents here. California is a community property state. I have had a few clients who were married but wanted to purchase property as sole and separate property. To do so, these married folks had to have their spouses sign an interspousal grant deed at Escrow before the close of escrow. This is not legal advice or personal advice, but just some information on what I have seen in my experience.
You should strongly consider discussing this matter with a real estate attorney. I have worked with several real estate attorneys, and if you would like their contact information, please do not hesitate to contact me.
Best regards and best wishes,