If it's an open-end line of credit, it would be optional reporting under the HELOC rules. I think the mixed use test refers to individual properties that have both residential and commercial purposes, not separate properties one of which has a residential use and the other having commercial purpose. So, to my way of thinking, if your bank doesn't report HELOCs, you wouldn't report this one. If your bank does report HELOCs, you would have to report this one.
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I'm fixin' to fix that.