Legal Question in Real Estate Law in California

Priority of liens is simple in this case and most cases - whoever records the lien earliest has first priority, and priority descends in chronological order after that. So the HOA (or other buyer at foreclosure) would take subject to the HELOC. The HOA or whomever buys the unit will have to pay the HELOC or face their own foreclosure.

After the foreclosure sale, you wil no longer own the property. If you don't want that to happen, refi and pay off the HOA. In a foreclosure sale someone buys the property and now owns it, the HOA is paid from the sale proceeds and the new owner is responsible for the HELOC. You may or may not still be obligated personally on the HELOC.