Using my friend's HELOC to finance my Brrrr

[Pedro Urena]

I would like to use a friend's home equity to finance a deal. The problem is that we don't know how to structure the loan between us. Since she is going to have to pay interest on her HELOC, how much higher of a percentage should I offer? Or, should I offer whatever is left after the refinancing of my Brrrr? Is there a standard when using money from somebody else's home equity to finance a deal? Any help is appreciated.