Opa-locka has a year-round code amnesty program. Once the violations are cured, the City Manager can reduce fines by up to 85%, and larger reductions need the City Commission. The application fee is $100 for a residence, the reduced amount is due within 60 days, and the city says it releases liens on settlement. Properties in foreclosure, with unpaid property taxes, or that have had amnesty before are not eligible.
There is a catch for sellers. The program says an applicant must consent to a filed lien and a prohibition on selling the property for 12 months, or repay the full amount of the lien. If you want to sell soon, that can make paying the lien from the sale proceeds the simpler route. This is general information, not legal advice; read the program terms, or ask a Florida attorney, before you apply.