Tax lien and city taking a property

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If I own a tax lien on a property and the city seizes the house from the current owner as abandoned, what is my position relative to the city? Do they have to pay off my lien? Can I end up with the property instead? The owner isn't competent so I can't purchase it from him and their are no heirs. The house has been vacant for years. I would like to end up with the property but if the city takes it, will they be required to sell it at auction?

Any advice is greatly appreciated.