The best course of action might be to have the HOA take possession of the empty condo and rent it to a tenant to generate revenue to pay off the lien.
That sounds like a wise move. Problem might be the bank is not willing to sell at a large loss over the loan amount, is what I heard. Not a real big problem for me as an owner because there are 120 units in this condo association, so percentage wise not a significant factor.
I bought my condo so that I do not have to spend time on maintenance outside. In my calculation, expect 15% waste in a typical condo operation, so that is the price I must pay for convenience and more free time.