Using a HELOC to Purchase a Duplex

[Brandt Collings]

My HELOC is 130K and 4% interest-only payments for the first 15 years. What would you consider to be the max purchase price for me. If you consider a 20% down payment and reserves for vacancies and maintenance? And What CAP rate would you target? Is this a risky maneuver? I still have 30% equity in my home with the HELOC.