This is all part of investing. Its not always a perfect picture. Sound like you need to find the money to rehab the home to either sell, or get it rented again.
Good luck,
RE Agent,
Remax
inhabitable = livable
uninhabitable = not livable
Insurance should cover repairs to the property if it was damaged by the fault of someone else. Check with your neighbors insurance company. If theirs won’t cover it, yours might.
Forclosure isn’t very helpful to anybody. Your best bet (as suggested) is to repair the unit to get it rented again.
Where is it?
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Sue the owner of the neighboring units that caused the flooding. That person is liable for the damage.
You could sell it as is on real estate auctions in your area, LandTrades.com, Bid4Assets.com, eBay, etc. There are all kinds of avenues of letting go of this type of property. You should buy a book on how to flip property online, there are investors that are always looking for deals on flippable rehabs. See the book below on how to flip real estate online.