Question about inheritance buyout and Prop 19 tax benefit on property in CA

[AJ Stanis]

Hi,

I have a question about inheriting a property in California.  I am inheriting a property in CA with my siblings, the property is in an irrevocable trust and I am looking to buy them out.    At first I thought I could just do a cashout refi and pay them off.  

But now I am being told that if I do a refi to pay them off I will lose the 'prop 19' tax basis on the portion of the property I buy from them, even if I move into it as my primary residence.  Is this true?    How do I keep the prop 19 tax benefit on the property and buy them out?